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This manual aims to support the sustainable use of bamboo in quality post-disaster reconstruction by bridging the gap between the knowledge held by skilled bamboo artisans and professionals about bamboo construction and the very immediate need for practical solutions for aid workers and affected communities in post-disaster responses.
Citation preview
Draft2,2009
HUMANITARIANBAMBOOAmanualonthehumanitarianuseofbambooinIndonesia
Building
FOREWORD
TheseguidelineshavebeendevelopedasaNOLOGOproject,withthegeneroussupportofOxfamGreatBritain’sPRIMEprojectinJogjakarta,Indonesia.TheprojecthasbeenmanagedbybyDaveHodgkinfromBenchmarkConsulting.Contributionsandassistancehavebeenreceivedfromnumerousbambooanddisasterresponseexperts,bothinIndonesiaandIndia,andShelterClusterparticipantsglobally.
Thefirstdraftoftheseguidelinesprovidedagenerallayoutofthedocumentalongwithsomebriefcommentaryabouteachpotentialsection.Thisseconddraftprovidesthefirstoveralldocumentreadyfortechnicalverificationfromkeyadvisorsaswellasforuseinthefield.ThethirddraftwillincludeanyfurtherrecommendationsandwillbemadeavailableinbothIndonesianandEnglishlanguageversions.
TheseconddraftisalsoavailableontheHumanitarianBamboowebsiteatwww.humanitarianbamboo.org
Anyfeedbackorinputintothefurtherdevelopmentofthisdocumentismuchappreciated.Allcommentsshouldbesentto:
DaveHodgkinBenchmarkConsultingRt06Rw04Tembi,[email protected]+6281392099666
ACKNOWLEDGEMENTS
TheauthorwouldliketoacknowledgethefinancialassistanceofOxfamGreatBritain’sPRIMEprojectinJogjakarta,Indonesia,andwouldparticularlyliketothankAleAidid,KimWilliamsonandLorenLockwoodfortheirassistanceinresearchandediting,andAntoHamid,SebastianFesneauandtherestoftheteamfromOxfamGBIndonesiafortheirsupport.
Productionofthisdocumentwouldnothavebeenpossiblewithoutthegenerousassistanceofthefollowingcontributorsandtheirrespectiveorganizations:
HUMANITARIANADVICE
• Ashley,Cleo,Manfred,TimoandstafffromtheInternationalOrganisationforMigration,Jogjakarta• KellyandstafffromCHF• BillMarsdenandhisstafffromIFRC• LorenLockwood,CaritasSwitzerland• JoeAshmorefromAshmoreConsultingandhumanitariantimber.org• SarbjitSingh,PradeepandstafffromRedRIndia• RetnoandstafffromUNDPJogjakarta• ArimbiandSatriofromDeJaRup• ParticipantsattheconsultativeforumsonbothYogyakartaandPuneIndia• OthermembersoftheYogyakartaEarthquakeResponseShelterCluster.
BAMBOOTECHNICALADVICE
• AriefandLindaGarlandfromtheEnvironmentalBambooFoundationinBali• ThestaffofSahabatBamboo• BenBrownfromMangroveActionProjectandIshwaraEnvironmentalInstitute• JatmikaSurybrataandhisteamatUniversityofGadjaMada,Jogjakarta• PakMarissoandteam• PakPurwitofromDepartmentofPublcWorksResearchCentreinBandung• AntonandJohnHardyfromP.TBambuinBali• JulesJohansenandothermembersoftheINBARBambooHousingForum.
EDITINGANDPROOFING
• Ruth,Kim,Thor,Ben,Ale,Baktiandmanyothers.Theabove list is far fromcompleteasmany individuals andorganisations, both local and internationalhave provided valuable input into the development of this document. The author apologises for anyomissions.
SectionA
Introduction1. Introductiontothemanual
2. Introductiontobamboo
3. Decidingtousebamboo
SECTIONDESCRIPTION
SectionB
Sourcing1. Cropmanagement
andharvesting
2. Treatment
3. Procurement
4. Logistics
5. Logistics
SectionC
Building1. Design
2. Construction
3. Maintenance
4. Otheruses
SectionD
Support1. Programmingtools
2. Furtherresources
3. Appendix
1
Building
TableofContentsFOREWORD IACKNOWLEDGEMENTS IISECTIONDESCRIPTION IIIGLOSSARYOFTERMS 2A.1INTRODUCTIONTOTHEMANUAL 4
A.1.1.Outlineandstructure 4A.1.2Rationale 4A.1.3Process 4A.1.4Targetaudience 5A.1.5Disclaimer 5
A.2INTRODUCTIONTOBAMBOO 6A.2.1Bambootheplant 6A.2.2Introductiontobambooinhumanitarianconstruction 9
A.3TOUSEORNOTTOUSEBAMBOO 10B.1MATERIALSOURCINGANDSPECIFYING 12
B.1.1Selectionandgrading 13B.2CROPMANAGEMENTANDSUSTAINABLEHARVESTING 18
B.2.1Harvesting 19B.3TREATMENT 21
B.3.1Totreatornottotreat 21B.3.2Protectionwithouttreatment 22B.3.3Protectionthroughtreatment 25
B.4LOGISTICSANDHANDLING 29C.1DESIGNINGAPROGRAMTHATUSESBAMBOO 31C.2DESIGNINGWITHBAMBOO 32
C.2.1Comparativecharacteristicsofcommonconstructionmaterials 32C.2.2Designprinciples 33
C.3CONSTRUCTION 37C.3.1Stagingconstruction 38C.3.2Jointingsystemtypes 39C.3.3Examplesofcommonjoints 40C.3.4Walling 41C.3.5Flooring 45C.3.6Roofing 46
D.1FURTHERRESOURCES 48D.1.1Internetresources 48D.1.2Organisations 48D.1.3Books 49
D.2FURTHERUSESOFBAMBOOINHUMANITARIANPROGRAMMING 50D.2.1Prepositioningtreatedbamboostocks 50D.2.2Designingwithcurvedelements 50D.2.3Bamboocompositeconstructionproducts 51
D.4DISTRIBUTIONMAPSOFBAMBOOININDONESIA 53
2
GLOSSARYOFTERMS
TERM MEANINGBeams Majorhorizontalstructuralelementsofabuilding.
Bracing Elementsincorporatedintoabuildingtostopthebuildingfromracking(rocking)underchangingloads.
Clump Agroupofculmsformingoneindividualbambooplant.
Clumpingspecies
Oneoftwomajorgroupingsofbamboo,technicallyknownasleptomorphsormonopodialspecies,inwhichnewrhizomesformfromthebaseofexistingculms,resultinginacloseknitstand.Thefibresofclumpingspeciesaregenerallymoreintertwinedthanthoseofrunningspecies.Thevastmajorityofallequatorialbambooareclumpingvarieties.
Columns Majorverticalstructuralelementsofabuilding.
Culm Thecommontermforoneindividualstickofbamboowithinaclump.
Eaves Theelementofaroofthathangovertheexternalwalls.
Fishplate Abridgingelementappliedtothesideofoneortwobuildingelementstoprovidereinforcingandstrengtheningacrossaweakpointinconstruction
Inter‐nodalspace Thehollowsectionoftubebetweenanytwonodesinabambooculm.
Joists Horizontalstructuralelementsthatflooringorroofingisattachedto.
Lintels Horizontalstructuralelementsaboveanopening(e.g.adoorwayorwindow),designedtoensuretransferoftheloadtoeithersideoftheopening.
Node Thesolidsectionthatregularlybreaksupthehollowtubularsectionofaculm.
Nogs Smallspacingelementsplacedbetweenlargerconstructionelements(suchasstudsorrafters)topreventthemfrombucklingortwisting.
Pegordowel Smallconstructionelements,commonlymadeoftimberorbamboo,driventhroughholesinadjoiningpiecesoftimberorbambootopinthetwopiecestogether.
Racking Swayingorwarpingofastructurewhenhorizontalloadsareapplied.
Rafter Structuralroofingpiecesthatextendfromtheridgeoftheroofdowntotheexternalwalls,orbeyondtheexternalwallstocreateeaves.
Rhizome Thebelow‐groundshootthatformsthestartingpointforthedevelopmentofanewculm.
Rhizomebud Thenewlyformedrhizomeasitbranchesawayfromthemainclump.
Ridge Thehorizontalconstructionelementthatformsthehighestpointoftwoormoreintersectingroofplanes.
Runningspecies
Oneoftwomajorgroupingsofbamboo,technicallyknownassympodialorpachymorphbamboos.Rhizomesformfromundergroundrunnersupto30metresfromthelastculm,allowingthebambootospreadoveraneverincreasingarea.Thefibresofrunningvarietiesaregenerallymuchstraighterthanthoseofclumpingspecies.ThesespeciesmainlyoccurfurtherfromtheequatorincoldernorthernclimatessuchasChina.
Shoot Theearlysectionofanewlyemergingculmasitfirstappearsabovetheground.Thissectionofthebambooishighlynutritiousandedibleforbothhumansandlivestock.
Underpurlin Horizontalstructuralelementsthatsupportraftersorjoists.
Warpage Twistingandbendingofbambooortimberovertime,commonlycausedbyexposuretoadverseconditions,suchasheavyloadsorbrightsunlight.
3
KeyPoints
• Thissectionoftheguidelinesintroducethekeyissuesinvolvedwithusingbambooinpost‐disasterhumanitarianshelterprogramming,andaimstobringtogetherhumanitarianworkers’understandingofemergencyresponseandbambooexperts’technicalknowledgeofbambooconstruction.
• Bambooisanidealresourceforuseinhumanitarianshelterprogrammingduetoitshighstrength,lowcost,rapidgrowthandhighavailabilityacrossmanydisaster‐proneregions.
• Whendecidingwhethertousebamboo,anumberoffactorsshouldbeconsideredincludingavailabilityofskillsandresources,aswellastheacceptabilityofbambootothecommunity.
SectionA
Introduction1. Introductiontothemanual
2. Introductiontobamboo
3. Decidingtousebamboo
4
A.1INTRODUCTIONTOTHEMANUAL
A.1.1.OUTLINEANDSTRUCTURE
Thismanualcomprisesfoursections:
• SectionAintroducesbambooandbambooconstruction,includingimportantconsiderationswhendecidingwhethertousebambooinhumanitarianprogramming.
• SectionBoutlinesissuesrelatedtosourcingbamboo,includingcropmanagement,harvesting,treatmentandprocurement.
• SectionClooksatbuildingwithbamboo,includingdesign,constructionandmaintenanceconsiderations.
• SectionDprovidesalistofadditionalresources.
A.1.2RATIONALE
Inresponsetothe2006Jogjakartaearthquake,over70,00024m2bambootransitionalshelters,withanaveragecostof$US100‐200,wereerectedover9months.Theconstructionoftheseshelterswasoneofthelargestandmostrapidpost‐disastershelterresponsesinrecenthistory,atrelativelylowunitcostandwithminimalenvironmentalimpact.
FromtheJogjakartaearthquakeresponse,itbecamecleartomanyagenciesthatalthoughbambooisacost‐effective,strong,cheap,rapidlyconstructedandreadilyavailablematerial,manyhumanitarianworkerslackexperienceinusingbambooandlackclearguidanceonbestpracticeinbambooconstruction.Therefore,theseguidelineshavebeenproducedtohelphumanitarianworkersmakebetterinformeddecisionsaboutwhenandhowtousebambooinpost‐disastershelterresponses.Theguidelinesaimtoprovideanopensource,“nologo”bridgebetweenthetechnicalknowledgeofbambooexpertsandthedisasterresponseexperienceofhumanitarianworkers.Theguidelinesaimtoprovideageneralintroductiontobestpractice,whileprovidingspecificexamplesfromtheIndonesiancontext.
A.1.3PROCESS
Theseguidelinesarebeingdevelopedinconjunctionwiththewebsitewww.humanitarianbamboo.orgtoprovideinitialguidancetoworkerswhoareconsideringusingbambooinpost‐disasterresponse.Theguidelinesareinnowaycomprehensive;practitionersshouldseektheadviceoftechnicalexpertsandlocaltradespeopletoprovidemorespecificadviceontheirindividualprograms.
Theproductionoftheseguidelineshasbeenbrokenintoanumberofsteps:
ConsultativeworkshopswereconductedinJogjakarta,IndonesiaandPune,Indiatoprovideadviceoncontent.
Indonesia‐specificguidelineswereproduced,withthefirstdraftwritteninEnglishandtranslatedinto
5
Indonesian.
Awebsiteisbeingdevelopedasarepositoryofinformationaboutbambooprogramming.
Amoreinternationalsetofguidelinesmaybedeveloped,dependingonacceptanceandrelevanceoftheseinitialguidelines,andthewebsitecouldalsobeexpandedtoprovidealargercollectionofinternationalinformation.
A.1.4TARGETAUDIENCE
Thismanualisprimarilyforhumanitarianpractitionersinthefield,providingthemwithguidanceonbestpracticeinbamboouseandconstruction.Otheraudiencesmayinclude:
• Membersofdisaster‐affectedcommunitieswhoarelookingforguidanceonwhattoexpectfromhumanitarianworkers,orforguidanceontheirownbambooprojects.
• Donorswhoarelookingforguidanceonbestpracticeinthesector,orwhowouldlikeassistanceinassessingfundingproposalsforprojectsusingbamboo.
A.1.5DISCLAIMER
Itisalmostimpossibletoproduceasetofguidelinesshortenoughtobereadinthelimitedtimeavailabletoemergencyworkersbutdetailedenoughtoprovidecleartechnicaladviceonallaspectsofbamboouse.Thereforethismanualintroducesthereadertothekeyissuesofbamboouseinpost‐disastershelterprograms,andprovidesawebsitewithadditionalreferencesandsourcesforthoserequiringfurtherinformation.
Post‐disastershelterprogramsaimtoassistfamiliesalongthepathfrompost‐disasterhomelessnesstoadequatesheltersecurity.Thedesignofsuchprogramsmustthereforeincludeextensiveinputfromthelocalcommunity.Bambooconstructionmethodologyisintricatelylinkedtolocalcultureandvariesgreatlyfromplacetoplace—qualityprogrammingwillintegratetheprinciplesfromtheseguidelineswithlocalwisdom.
Theinformationpresentedinthismanualisforgeneralguidanceonly,aswithanyhumanitarianprogramalladviceshouldbecheckedagainstlocalknowledgeandtechnicalexpertisebeforeapplyingittoaspecificsituation.
6
A.2INTRODUCTIONTOBAMBOO
A.2.1BAMBOOTHEPLANT
Bambooisoneofthemostusefulplantsknowntohumanity.Allpartsoftheplantareused:shootsprovidenutritiousfood,leavesprovidefodderandstalksprovideconstructionmaterials.Bambooisusedinmorethanathousandways,includingpostandbeamconstruction,formwork,food,fodder,musicalinstruments,piping,walling,flooring,mats,baskets,roofing,cookingutensils,medicineandcharcoal.
Bambooisahighlyversatile,strongandrenewableresource,anditisusedthroughouttheworld.InIndonesia,forexample,bambooisanintrinsicpartofdailylife:homesarebuiltfrombamboo,floorsandwallsarecoveredwithbamboo,bamboobasketsandpotsadornhousesandcountlessbamboobridgescrosssmallstreamsandrivers.
Morethan1000speciesofbamboohavebeenidentified,andmorethan100specieshavebeenclassifiedas‘woodyspecies’suitableforconstruction.InIndonesiaalonetherearemorethan140knownspecies,ofwhichatleast16arecommonlyusedinconstruction.
GROWTHPATTERNOFBAMBOO
Bambooistechnicallyaformofgrass,growinginclumpsorforestsoflargetubularsectionsknownasculms.Bamboocanbebroadlydividedintotwogroups:runningandclumping.Clumpingspeciessprouttheirnewshootsclosetothebaseofexistingculmswhilstrunningvarietiesmaysendoutshootsasfaras30mfromanexistingculm,potentiallyasfarastheculmsaretall.MosttropicalspeciessuchasthosefoundinIndonesiaareoftheclumpingvariety,whilstrunningvarietiesarelargelyconfinedtocoldernorthernregionssuchasChina.
Bamboodiffersgreatlyfromtimberbothingrowthpatternandstructure.Unliketimber,individualbambooculmsgrowtotheirfullheightandgirthinasinglegrowingseason,whilsttheoverallclumpreachespeakproductionataround7yearsandcanmaintainregularcroppingofaround20‐25%throughoutitsproductivelifecycle,untiltheplantfinallyflowersandthendiesoff.
Youcanwatchitgrow!Thetallestbamboocangrowatup
to1–2mperday,reachingheightsofover35minonegrowingseason.
That’s15–20cmoverlunch.
7
BAMBOOLIFECYCLEFROMSHOOTTOCULM
LIFECYCLE
Thelifecycleofthebambooplantcommenceslikeanyotherplant,sproutingforthfromaseedandsendingupitsfirstshoottoformanewculm,whichsproutsleavestocommence
photosynthesis.Thefirstculmsinanewclumparelimitedinsizebythephotosyntheticcapacityofthenewclumpresultingin
smallerculmsuntilsufficientculmsexistfornewculmstoreachfullheight.
Asthewetseasonapproaches,newrhizomesbudsformunderground.Thenasrainscommence,therhizomesform
newshootsthatsproutintothatseasons’culms,reachingtheirfullheightandwidthoverthefirstrainyseasonofonly3‐4months.Duringthefirstseason,culmsaresobusyshootingupthatitisonlyoverthenextyearthattheythencommencetosendoutbranchesandbegintophotosynthesize.Intheirfirstyear,bambooculmsdependentirelyonthehealthoftheclumpinthefirstyeartoreachtheirfullheight.
Overthenext2‐3yearsculmsdryoutandtoughenup,reachingtheirfullstrengthandmaturityataround4‐5years.By6‐7yearsfungalattack,rotandagebegintosetinandtheculmsfinallysuccumbfallingtothegroundtorotandprovidefeedandprotectionfornewlyformingshoots.
Thelifecycleofindividualculmsmeansthatanewclumpreachesfullmaturityandmaximumproductioncapacityataround7‐10years.Theplantthencontinuesonuntileventuallyfloweringandthendyingoff.Thefulllifecycleofaculmvariesgreatlyfromspeciestospecies.Smallornamentalspeciesmayfloweranddieoffannuallywhilstthelargerwoodyspeciesusedinconstructionmayhavealifecyclefrom60‐160years.
Manylargerwoodyspeciesdieoffinsuddenmassfloweringeventsthatmaycausegreathavoc
todependentcommunitieswhocanbeadverselyaffectedbyensuingplagues
ofanimalssuchasrodentsfeedingoffthemassseedsandthenbyfurtherplaguesof
predatorsfeedingonthem.
BamboomassfloweringInmanylargerbamboos,floweringoccursenmasseacrossaspecies,incyclesthatmaybeoncein100yrs+,Suchmassfloweringeventsmaycausegreatchangetoecosystemswreakinghavocincommunitiesthatdependonthebamboo,orwhomaybeheavilyaffectedbyensuingplaguesofseed‐eatingpestsandtheirpredatorssuchasratsandthensnakes.
Fullsizein3monthsUnliketimberwhichmaytaketensorhundredsofyearstoreachfullheight,aculmofbambooreachesitspinnacleinoneseason,onlytougheningupoverthenextyears.
8
BAMBOOSECTIONSFILLEDWITHWATERTHENBURIEDFOR
SPROUTING.
COMMONMETHODSOFBAMBOOPROPAGATION:CLUMPSEPARATIONANDCUTTINGS
CULTIVATION
Bamboomaybegrowneitherdirectlyfromseed,throughcuttings,orbydivisionsofclumps.Asmanywoodyspecieshavelongperiodsbetweenflowerings,withoftenlowratesofgerminationfromseed(below1%),thisistheleastcommonmethodofcultivation.Smallerplantvarietiesareeasilyhandledandthereforecommonlycultivatedthroughclumpseparation,whilstlargervarietiesaregenerallypropagatedthroughcuttings.
Acommoncommercialmethodofpropagatingwoodybamboospeciesinvolveshorizontallyburyingcuttingsthatare3‐4nodesinlengtharoundsixinchesbelowgroundpriortoonsetoftherainyseason.Holesarecutmidwaybetweennodes,witheachsegmentthenfilledwithwaterpriortoburial.Newshootsthenformfromthenodaljoints.
Concernabouttheimpactofmassbambooconstructionprojectsonlocalcommunitystocksmayleadagenciestoconsidercommunityreplantingprograms.BamboocultivationisoutsidetheprimaryfocusofthisdocumentbutformoreinformationpleaserefertotherecentlypublishedbookbytheEnvironmentalBambooFoundationontheharvestingandmanagementofbamboo.
DISTRIBUTION
Bamboogrowthislargelyconfinedtohighrainfall,tropicalregions,thoughitcangrowincoldertemperateorsub‐temperatezones.Bambooofdifferingspecies,qualityandquantityoccursacrossmostofIndonesia.
ForfurtherdetailondistributioninIndonesia,seeSectionD.3DistributionmapsofbambooinIndonesia.
9
A.2.2INTRODUCTIONTOBAMBOOINHUMANITARIANCONSTRUCTION
Bamboo’scombinationofhightensilestrengthandlightnessmakeitanidealmaterialforrapidconstructionofemergencyortemporaryhousing.Whenwell‐built,thehightensilestrengthandflexibilityofbamboomakesbamboosheltershighlyresistanttodamagebystrongwind,floodsandearthquakes.Thesefactors,combinedwithbamboo’slowcostandeaseofavailabilityinmostofthedisaster‐pronetropicalregionsmakebambooanidealmaterialforuseinmanyhumanitarianprojects.
BambooisusedforconstructionthroughouttheworldwithmajorresearchbasesinChina,India,Hawaii,Indonesia,Brazil,aswellasinEuropeandAmerica.Morethan200speciesofwoodybambooareusedinconstructingsuchdiverseobjectsasfurniture,houses,temples,watertanks,highrisebuildings,scaffolding,bicyclesandcutlery.Treatedandwell‐maintainedbamboostructureshaveaslongalifeexpectancyastheirtimberequivalent,withtheworld’soldestbamboostructuressurvivingthousandsofyears.
Bamboomaybeusedforalmostallaspectsofconstruction,fromroofingtoflooring,wallframingtowallandfloorcladding;evenpipingofwaterispossibleinbamboo.
Buildingwithbamboodoeshoweverposechallengestomanyaidworkerswhomayhavelittleexperienceofthisuniquematerial.Althoughsimilarinmanywaystobuildingwithtimber,utilizingthesametoolsandgeneralframingtechniques,bamboodesignandconstructiondoeshaveitsownparticularrequirements.Althoughasstrongasmildsteelinverticaltensionorcompression,bamboo’shollowtubularsectioniseasilycrushedbetweennodes;hencenodalplacementbecomeskeytothesuccessofanybamboostructure.Bambooculmsarealsomorepronetosplittingwhennailedorscrewed,hencearangeofotherfasteningmethodsneedtobeconsidered.
Itiscriticaltounderstandthatthedurabilityofbamboostructuresisdependentonanumberofkeyfactorsincludingthequalityandspeciesofbambooused,theweatherresistanceofthedesign,andthestrengthandstabilityofthestructuraljoints.Thisdocumentprovidesanintroductiontotheseissues,butlocalknowledgeandgoodtechnicaladviceshouldbesoughtonacasepercasebasis.
HousingtheworldAnestimated1billionpeople
acrosstheglobecurrentlyliveinhomesmadefrombamboo.
10
A.3TOUSEORNOTTOUSEBAMBOO
Theappropriatenessofbambooforagivenhumanitarianprogramneedstobecarefullythoughtout.Factorsthatmustbeconsideredarediverseandcomplex.
NEEDTOINTERVENENEEDFORASSISTANCE=(DAMAGELEVELSXLIKELYHEALTHIMPACTS)MINUS
COMMUNITY+GOVTCAPACITYTOASSIST
CONSTRUCTIONSKILLS
DOESTHECOMMUNITYHAVEDEMONSTRATED
KNOWLEDGEOFBAMBOO
CONSTRUCTION?
BAMBOOSUPPLYARETHERESUFFICIENTBAMBOORESOURCESIN
THEAREA?ARETHESERESOURCES
ADEQUATELYMANAGED?
TREATMENTWILLTHEBAMBOONEEDTOBETREATEDPRIORTOUSE?
ISTREATEDBAMBOOAVAILABLE,ORWILL
BUILDINGATREATMENTFACILITYBEREQUIRED?
MOSTAPPROPRIATERESOURCE
ISBAMBOOTHEMOSTAVAILABLEAND
APPROPRIATERESOURCE?HAVECOCONUTWOOD,CONCRETE,TIMBEROROTHERRESOURCESBEEN
CONSIDERED?
PROCUREMENTWHOWILLUNDERTAKE
PROCUREMENT?THECOMMUNITY,ORTHEAGENCY?
HOWWILLBULKPROCUREMENTIMPACTINTHEAFFECTED
COMMUNITYANDITSRESOURCES?DOESPROCUREMENTFURTHER
AFIELDNEEDTOBECONSIDERED?
TRAININGWILLTECHNICALTRAINING
BEREQUIRED?ISITFEASIBLEAND
APPROPRIATE?CANWEFINDLOCALTRAINERSORWILLWENEEDTOBRING
THEMINFROMELSEWHERE?
ACCEPTABILITYTHELOCALGOVERNMENT,
DONORSANDORTHEAFFECTEDCOMMUNITYMAYPERCIEVEBAMBOOASALOWSTANDARDMATERIAL.HAVETHEYBEENCONSULTED?CANWESUPPLYINFORMATIONON
QUAILTYBAMBOOCONSTRUTION?
DURABILITYWILLTEMPORARY
BAMBOOSTRUCTRESBEDURABLEENOUGHUNTILLPERMANENTSOLUTIONS
ARRIVE?
AIDEQUITYWHATAREOTHERSHELTER
ACTORSPLANNING?CANTHISPROJECTSUPPLYANEQUIVALENT‐VALUE
SOLUTION?
?
11
Introduction
SectionBSourcing
Building
Support
Building
KeyPoints
Theimportanceofbambooasalocalcommunityresourcemakesitessentialthathumanitarianworkersconsidertheeffectoflarge‐scaleprocurementonregionalbamboostocks,andsetinplacesystemsthataddresspotentialnegativeimpacts.
Totreatornottotreatbambooisanoverarchingdecisionthatwillaffectalllevelsofprogrammingandneedstobeconsideredearlyoninprogramdesignandprocurement.
Bambooiscommonlyacommunityresource;hencethevoiceofthecommunityisimportantatallstagesofprocurementofbambooandbambooproducts.
SectionB
Sourcing1. Materialsourcingand
specifying2. Cropmanagementand
sustainableharvesting3. Treatment
4. Logisticsandhandling
12
B.1MATERIALSOURCINGANDSPECIFYING
Sourcingbambooinsufficientvolumeandqualityprovedtobeamajorchallengeformanyagenciesduringthe2006Jogjakartaearthquakeresponse,withsomeagenciesconsumingover10,000culmsadayattheirpeak.Itiscriticalwhendesigninglargescaleprogramstocarefullyconsidertheimpactofsuchlargescalepurchasingonboththeavailableresourceandthelocalmarket.
Relative merits of procurement options Community Local or regional National
Pros • Fundsinjectedatthelowestlevelintoacommunitycanproduceupto8timestheeconomicbenefitfortheaffectedpopulation.
• Qualitycontrolenforcedbythehomeowner.
• Increased“ownership”oftheprogram.
• Workswellwithruralcommunitieswhohaveagoodunderstandingofbambooselectionandconstruction.
• Easilycentrallycontrolled.• Inspectionofsuppliers,
sources,businesspremisesandstoragefacilitiescanbeeasilyconducted.
• Putsmoneyintolocalbusinesshelpingkick‐starttheeconomy.
• Potentiallylarger,moreprofessionalsuppliers.
• Potentiallyspreadstheenvironmentalimpactoveralargerarea.
• Reducestheimpactonlocalmarkets.
Cons
• Requireshigherlevelsoffinancialcontrol.
• Requirescommunitytrainingforqualitycontrol.
• Urbancommunitiesmayhavelittleornoexperienceinprocuringandconstructinginbamboo.
• Highpotentialforshorttermimpactonthelocalpriceofbamboo,potentiallypricingself‐recoverygroupsoutofthemarket.
• Potentialforhighlevelshort‐termandevenlongtermimpactonlocalbamboocrops.
• Moredifficulttoinspectoffices,storageandtransportfacilities.
• Hardertoregulateharvestingpractices,hencepotentialforincreasedenvironmentalimpact,albeitfurtherafield.
• Requiresstrictertenderingprocessesandcontrols,henceoftenslowertoinstigate.
NOTE:Thedecisiontousetreatedoruntreatedbamboomustbefullyintegratedintoprocurementplansasmanytreatmentsystemsrequirebambootobetreatedwithindaysofharvest,whilstthelifeexpectancyofnon‐treatedbambooisverydependentonhowandwhenitwasprocuredandhandled.SeeSectionB.3Treatment.
13
B.1.1SELECTIONANDGRADING
Thequalityofanygivenconstructionisonlyasgoodasthematerialitismadefrom.Alargerangeoffactorscanaffectthequalityofbamboo,includingwhenitisharvested,itsageetc.Thefollowinglistprovidessomeguidanceonbambooselection.Thisguidancecanneverreplacethewealthoflocalknowledgeregardinglocalmarketsandbamboospeciesandquality.
AGE
Mostspeciesofbambooachievetheirpeakstrengthbetween3and6yearsofgrowth.Henceitiscriticaltogoodprogrammingthattheageofculmsischeckedatthetimeofprocurement.Furthermore,theharvestingofimmaturebamboomayadverselyaffectcropproductivityformanyyearstocome.SeeSectionA.2Cropmanagementandsustainableharvesting.
Exactindicatorsofagevarygreatlyfromspeciestospecies,makingitisessentialtoworkwithlocalbambooexpertstodevelopasetofageindicatorsthatcanbeagreeduponasacceptablebyboththesuppliersandtheaffectedcommunity.Howeversomecommonindicatorsinclude:
• Duringthefirstyearsofgrowth,thejuvenileleavesthatformaseachbranchformsarestillvisiblyattachedtothemainstalkofbamboo.Asbambooagesthesefallaway.
• Asbambooagesitlosesitsfreshgreencolour,slowlydarkeningtopalebrown.• Asbambooagesthewallsbegintodryoutandharden,causingtheinternodalwallstoshrink,
showingwrinkles.• Perhapsthesuresttestofageisthesoundortonethebambooproduceswhenstruck.Bamboothat
istooyoungortoooldhasamuchflattertonethanthetoneproducedbythefirmercorrectlyagedbamboo.Asmallamountofpracticewillclarifythecorrecttoneforanygivenspecies.
Checking the age of bamboo
Too young Correct age Too old • First‐yeargrowthwillhaveno
signsatallofvestibulebrancheshavingformed.
• Thejuvenilesheathesthatformtoprotectnewlyemergingbranchesmaystillvisibleontheculm.
• Dulltoneanddampcoldfeel.• Whensliced,thebamboois
wet,sweetandsoft.
• Somecollapseinwidthbetweennodesandsomeminorwrinklingofskinsurface.
• Firmandtighttone(althoughhardtodescribe,thisoftenthesimplestandmosteffectivetestofsuitabilityforconstruction).
• Juvenilecracksandsplitsformingacrossnodes.
• Highlevelsofcollapseinwidthbetweennodesorhighlywrinkledsurfaces.
• Highlevelsofvisiblefungalattack.• Dulltonewhentapped.• Easilysnappedorcrushed.• Dullbrownincoloureventhough
freshlycut.
14
Sketchorphotoof
simplemeasuringtool
SIZE
Whenspecifyingbamboosizesinlargequantities,itisimportanttoconsidertheimpactthattheoftenlarge‐scalebulkprocurementinvolvedinhumanitarianworkcanhaveonlocalmarkets.Diversifyingthesizesandspeciesbeingprocuredcangreatlyreducetheimpactonanyoneresource.
Ideally,bamboohousesarebuiltusing3or4differentsizesandorspeciesofbamboo.Commonly,largersizedelements(6”andabove)areusedforposts,whilestructuralbeamsandtrussesmayuse3”or4”material.Raftersarecommonly2‐3”whilstbatonsmayonlyrequire1‐2”materialorsplitbamboos.Flooringorcladdingmaterialmayhaveyetdifferentrequirements.
Bambooiscommonlysoldinalimitednumberofpre‐setwidthsandlengths.Lengthsmayveryfromareatoareadependingontrucksizes,whilstcommonwidthsaremoreoftenbasedonspeciesavailabilityandmarketdemand.InIndonesia,bambooiscommonlysoldinlengthsof6mwithdiametersof5,7.5,10and15cm.
Whensettinginplaceprocurementprocedurestodetermineminimumandmaximumsizesofbamboo,asimpletoolcanbemadefromaflatplanwithtwoholescutintoit.Ifthesmallendofthebamboocanbeslippedintothesmallholethebambooistoosmallandifthelargeendofcannotbeslippedintothelargewholethenitistoolarge.Atoleranceof5‐10%acrossatruckloadmayallowforsomevariationinwhatisneededonsite,whilstreducingtheburdenonthesupplier.
STRAIGHTNESS
Forpredictabilityofstrengthloadsandreplicabilityofdesign,culmsshouldbeofareasonablelevelofstraightness.Acceptablelevelsof“sweep”and“crook”maybemeasuredusingastringlinestretchedfromthetiptothebuttoftheculm.Nopartoftheculmshouldfalloutsideofthelineofthestring.
Note:Mildlybentculmsmaybesuitableforuseasshortermemberssuchasnogsandbracing,whilstkeepingthestraightestsectionsforlongerapplicationssuchasraftersandpoles.
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IDEALBAMBOOFORCONSTRUCTIONHASNODALSPACINGSOFBETWEEN30AND60CM
EXAMPLESOFSPECIESDIVERSITY:THIN‐WALLEDBAMBOOSUITABLE
FORRAFTERS,THICK‐WALLEDSUITEDTOPOLESANDSOLIDBAMBOOUSEDFORHAMMERHANDLES
TAPER
Foreaseofconstructionandconsistencyofstrength,culmsshouldbeselectedwithaminimalleveloftaperalongthelength.Amaximumtaperof10mmper3moflengthiscommonlyconsideredacceptable.
Overlytaperedculmsareonecommonsymptomofover‐croppingofaclumppriortofullmaturity.
NODES
Bambooisstraightbetweennodes,alteringdirectionslightlyatthenode.Hencebamboowithtightnodalspacingmaymakeforirregular‐shapedculmsthataremoredifficulttobuildwith.Widernodalspacing(30cm‐60cm)makesforstraighterbambooandthereforeeasierconstruction.Overlywidespacinglimitsthehorizontalstrengthoftheculm.
Thelengthofnodalspacingisgenerallyafeatureoftheparticularspecies,thoughnarrowspacingmaybecausedbyviralattackandstresswhengrowing.
Goodplanningandculmselectiononsitecanensurebestnodalplacementforimportantstructuraljoints.
SPECIES
Suitablespeciesforuseinhumanitarianprogrammingvarygreatlyfromareatoareaandapplicationtoapplication.Thevastvariationincharacteristicsandpropertiesbetweenspeciesmakesaccurateselectionessential.
Asageneralguide,speciesmostsuitedtomainpoleshavethickpulpywallswhilstspeciesforgeneralconstructionusesuchasrafters,havethinnerbutdenserwalls.Alargevarietyofspeciesareusedforwovensheetingandhandicraftsdependingontheexactneedsoftheproductbeingproduced.
Localadviceshouldalwaysbesoughtinanyareaforthemostappropriatespeciesforagivenapplication.
ACCEPTABLETAPER10MMPER3M
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ADVANCEDFUNGALATTACKONBADLY‐MANAGEDBAMBOOCLUMP
PINHOLEBORERATTACKONAGINGBAMBOO
SHEETING
INSECTANDFUNGALATTACK
Bambooshouldbecheckedregularlyforsignsoffungaldecayorinsectattackduringpurchasing,storageandconstruction.Damagedmaterialshouldnotedandrejected.Mostsuchdamageisduetoexcessiveageoftheculmattimeofharvestorisanindicationofpoorstorage,handling
orclumpmanagement.procedures.
Themostcommonformsofinsectandfungalattackinbambooarefromthepinhole(orpowder)borerbeetle,fungus,wetrotandtermiteattack.Eachoftheseflawsinbamboocanbeeasilydetectedusingthefollowingtableofindicators.
Themajorityoffungalandinsectattackpriortoconstructionispreventablethroughacombinationofimprovedharvestingandsapleachingtoreducehowediblebamboois,alongwithimprovedhandlingandstorage.Postconstructionpestissuesmayalsobecausedbypoordesignallowingexcessexposuretohumidityandgroundcontact.
INDICATORS NOTES
POWDERBORER
• 1‐3mmboreholes(exitholes)occurringsporadicallyoverthesurfaceofthebamboo.Exitholesusuallybeginatthenode.
• Smallpilesofveryfinedustonthegroundbelowthebamboo.
• Entranceatnodalpointsandends.
• Powderborerisperhapsthemostcommoncauseofdamageinbamboo.
• Harvestbambooattimeswhensugarlevelislowestinthesapwillreduceitsattractivenesstopowderborers,particularlyindryseasons.
FUNGALATTACK
• Mould‐likesporescanbeseengrowingontheoutsideofthebamboo.
• Bamboodevelopsadampmushroom‐likesmellandculmwallsbecomesoft.
• Fungalattackoccursduetoprolongedexposuretoexcessivehumidity.
• Rotatebambooregularlywhenstoredandstoreinwell‐ventilatedenvironment.
WETROT
• Weakeningofthesidewallofthebamboocommonlyatornearends.
• Rotiscausedbyexcessiveexposuretowater.Keepbamboofreefromgroundcontact,exposuretorain,andkeepareawelldrained.
TERMITEATTACK
• Sidewallsofbambooareeatenout,leavingbehindaweakhoneycomb‐likestructure.
• Coarserpilesofdustmaybeseenonthegroundbelowbamboo.
• Oncebrokenopen,termitesareoftenclearlyvisibleinsidethestructure.
• Generallyoccursovertimeafterconstruction.• Mosttermiteattackiscausedbysubterraneantermites,whoenterthroughdirectgroundcontact.
• Ensurethereisaphysicalbarrierbetweenthebambooandtheground.
• Removedamagedbambooandspottreatwithpoisonsthatworkertermitescancarrybacktothequeen.
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MINORSPLITTING,MAJORSPLITTINGANDENDSPLITTING
SPLITTING
ThemajorityofAsianclumpingbamboospeciesasusedinconstructioninIndonesiaarepronetosplitting.Althoughthisprovesagreatbenefitforthemanufactureofhandicraftsandwovensheeting,excessivesplittingcangreatlyweakenthestrengthofbambooinconstruction.Excessivesplittinginbambooiscommonlyasignofpoorhandlingandstorage,excessiveageoftheculm,oroverlyrapiddryinginthecaseoffreshlybambooleftfortoolongindirectsunlight.
Excessivesplittingmaybeanimportantindicatorofotherproblemsinhandling,storage,seasoningandharvesting,andassuchoffersanopportunityforimprovingqualitycontrol.
• Avoidpurchasingbamboowheresplittingcontinuesthroughthenode.• Allowexcessateitherendoftheculmwhenorderingtoallowforthenaturaltendencyofend
splittinginbamboowhendrying.• Hairlinesplitsareacceptablebutshouldbeconsideredasawarningofpotentialproblemssuchin
storageandhandlingorexcessiveculmage.• Splitsinthecentreofsectionsofbamboomayindicatepoorhandlingandpoorfellingtechniques.
Itisimportanttodefineandstipulateanagreedlevelofsplittingbetweenbeneficiariesandsupplierstoensureaminimumstandardisachievedthatthecommunityissatisfiedwith.Randomcheckswithintruckloadsshouldoccurtoverifythisandotherpotentialqualityissues.
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B.2CROPMANAGEMENTANDSUSTAINABLEHARVESTING
RecentresearchbytheEnvironmentalBambooFoundationinBalihasshownthatgoodcropmanagementpracticescanincrease
bamboocropyieldsbyupto400%,whilstpoorpractices(asarepronetooccurintherushofconstructionafteramajor
disaster)candevastatecropoutputformanyyears,orinsomecasespermanently.
Formanycommunities,bamboocropsperformessentialrolesindisasterriskreductionbystrengtheningriverbanks,bufferingstrongwindswithoutthehazardcausedbytreeswhenblownover,andshadingandcoolingthelocalenvironment.Trainingcommunitiesincropmanagementandtheresultantincreasedoutputcanprovidevaluableincomegenerationatavillagelevel,whilstalsoimprovingcommunityleveldisasterpreparedness.
The2008HumanitarianBambooConsultativeForuminJogjakartaidentifiedgoodcropmanagementasoneofthemostoverlookedaspectsofbamboousageintheJogjakartaearthquakeresponse.The
harvestingofmorethe20millionculmsofbamboofortemporaryhousingseriouslydepletedlocalbamboostocks.Theforum
recommendedthatallfuturebamboo‐basedhumanitarianprogramsshouldincludemeasurestoensuresustainable
harvestingandreplantingaspartoftheirprogramdesignandprocurementguidelines.
Growyourownprotection?Trainingcommunitiesingoodcropmanagementcangreatlyimprove
resilienceinfuturedisasters.Aswellasbeingavaluableresource,bamboo
providesanexcellentbufferforfloodsandstorms.
• CoolDiagramshowingaclumpofbamboonexttoariver,reinforcingriverbanks,transpiringwaterintotheair,shadingacommunityandprovidingwindbreaks
Growyourownhouse?Simplybymanagingcropsbetter,communitiescanincreasetheyieldoftheirbamboobyupto30%.Within3‐5years,familiescanquicklygrowanextensiontotheirshelter.
ProtectingcommunitiesOver90%ofhomelessnessthroughnaturaldisastersiscausedbywindandflood.Bambooplaysanimportantroleinacommunity’sresiliencetotheseevents.
BAMBOOPLANTSPERFORMANIMPORTANTROLEINDISASTERRISKREDUCTION,REINFORCINGTHERIVERBANK
ANDPROTECTINGAGAINSTFLOODS,WHILSTBUFFERINGSTRONGWINDSASWELLASPROVIDINGAVALUABLE
RESOURCEFORRAPIDPOST‐DISASTERSHELTER.
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B.2.1HARVESTING
Harvestingisoftentheonlytimethatcommunitiesengagewiththeirbamboostocks,henceprovidingthegreatestopportunityforcropmanagement.Althoughmanypractitionersagreethatinanemergency,bamboocropscanbeharvestedatanytimeofyear,itisclearthatharvestingatthecorrecttimeofyearandinthecorrectmannerwillgreatlyimprovebothbambooqualityandcropproduction,andmayincreasebamboo’susablelifespanbyuptotenfold.
WHENTOHARVEST
Inanemergencysituationbamboocanbeharvestedatanytimeorstageofitslifecycle.
However,thesusceptibilityofbambootopestinfiltrationishighlyinfluencedbysapsugarlevelsatthetimeofharvestandtherearepreferabletimesforharvest,withinthelifecycleofthebamboo,theannualcycleofgrowth,thetimeofthemonthaswellasthetimeoftheday.Forexample,harvestingduringtherainygrowthseasonshouldbeavoidedasitwilldamagenewlyemergingshoots,reducingoverallcropproductivity.Theguidelinesbelowshowhowtoincreasethelifeexpectancyofboththestructureandthecrop.
1) LIFECYCLE: Harvestculmsnoyoungerthan3yearsoldandnoolderthan5yearsold.2) ANNUALCYCLE: Harvestwelloutsidethegrowthphaseduringtherainyseason.3) MONTHLYCYCLE: Consultlocalknowledgeaboutthebesttimetoharvestbymooncycle.4) DAILYCYCLE: Harvestpreferablyatdawnwhenvisibilityissufficientbutsaplevelsarestill
low.
Best Worst
Harvest timing
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EXAMPLEOFHORSESHOECROPMANAGEMENTSYSTEM
HOWTOHARVEST
Bestpracticeinbambooharvestingincludes:
• Toensureadequatefoliagetofeedthedevelopingclump,ideallynomorethan33%ofaclumpshouldbeharvestedatanytime
• Harvestculmsat3‐5yearsold(thereissomevariationbetweenspecies).• Cutculmsimmediatelyabovethesecondnodeabovethegroundtoreducepotentialfungalattack.• Ensurecutsareasneataspossibleandcleanupwastebambootoreducepestinfestation.• Prunetheclumptoallowingmorelightinandencouragenew
shootgrowth.Clearoutculmsthatareo toooldandhavebegintodecay.o diseased.o brokenoroverlybent.
• Bamboocellsbegintocollapseandclosewithin2‐3daysofharvest,afterwhichtimetheyarenolongercapableoftransportingwater.Treatmentsystemsthatmakeuseoftheplant’svascularsystemmustbeundertakenduringthisperiod.Storingfreshly‐cutbamboounderwaterasiscommoninsapleachingprocedureswillincreasethisinterval.
Anumberofbambooforestrypractitionersrecommendmanagingbambooclumpsintoahorseshoecrossorrotatingflowerconfiguration.Inthispractice,newshootsareencouragedtoformattheoutsideoftheclump,withasmallaccesscorridormaintainedtoallowaccesstothecenter.Theinnersectionoftheclumpwillcontainolderculmsreadyforharvestingwhiletheouterexpandingsectionisonlynewgrowth.
ROUGHANDUNCLEANCUTSWHENHARVESTINGBAMBOORESULTINGININCREASEDFUNGALATTACK
DEVASTATEDBAMBOOCLUMPINBANTUL,
YOGYAKARTAASARESULTOFAGGRESSIVEHARVESTINGPOST‐2006EARTHQUAKE
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B.3TREATMENT
B.3.1TOTREATORNOTTOTREAT
Perhapsthegreatestdebateamongsthumanitarianworkersregardingtheuseofbambooiswhetherbambooshouldbetreatedornotpriortouseinpost‐disasterconstruction.Argumentsfortreatmentpointouttheobviousadvantagesofincreasedlongevityandtheensuingincreaseinbenefitfromassistanceprovidedtotheaffectedcommunity,whileproponentsagainsttreatmentpointoutsuchfactorsascost,potentialenvironmentalimpacts(notofconcernwithboraxtreatments),timedelaysinprocurementandsupply,andtheneedforincreasedtechnicalexpertise.
Thedecisiontotreatornottreatneedstobemadeonacasebycasebasis,andwillbebasedonarangeoffactorssuchastheforecastusagetimeofthestructuresbeingbuiltandtheavailabilityofsuitableskillsandequipment.Thisdecisionmustbebasedonaclearunderstandingoftheprofileofanygivendisasterandthesuitabilityofbambootreatmentsystemstotheintendedprogramdesign.
Inreality,indecidingwhetherornottochemicallytreatbamboo,thegreatestdefenseliesinhowbamboohasbeenhandledfromthemomentofharvest,orevenearlier,untilitseventualusageinshelterconstruction.Thebesttreatmentsystemsintheworldareeasilyunderminedthroughsimpleerrorsindesignandconstruction.Ontheotherhand,completelyuntreatedbamboo,correctlyharvested,cured,transportedandinstalledmaylastaslongastreatedbamboowhichhasbeenpoorlyhandled.
UntreatedbambooCheap,fast,effective:
buyittoday,useittoday.Biodegrades:lastsfor1‐3yearsdependingon
exposure.
TreatedbambooHasa20‐30yrslifeexpectancyifcorrectlyharvested,handledand
treated,andshelteredfromweatherinuse.Henceoffersagreatlyincreasedcontributiontocommunityresources.
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THEBESTPROTECTIONFORBAMBOOISKEEPINGITDRY.ALLOW
ADEQUATEEAVES,GOODDRAINAGEANDKEEPBAMBOOFREE
FROMDIRECTGROUNDCONTACT
B.3.2PROTECTIONWITHOUTTREATMENT
Themostimportantdefenseforanybamboostructure,whethertreatedornot,ishowwellitisdesignedforprotectionfromtheelements.Untreatedbambooindirectcontactwithmoistgroundorrainmaycompletelybreakdowninlessthanayear,treatedbamboomayfairnobetter.
Toachievealonglifeexpectancyfromabamboostructureitisfirstlyessentialtofollowgoodharvestingpracticetoensureminimalsugarswithinthebamboo.SeeSectionB.2.1Harvesting.
Keydesignprinciples:
Protectstructurefromrain
Provideadequateventilation
Ensureadequatedrainage
Avoiddirectgroundcontact
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COMPONENTSOFABAMBOOPROTECTIONSTRATEGY
24
AIRCURING
Bamboocanbeair‐curedbyleavingthebranchesandleavesonfortwotothreedaysaftercutting.Thisallowsthebambootoconsumetheremainingsugarsandstarcheswithintheculmreducingitsattractivenesstopests.Branchesshouldbekeptfreeofgroundcontactthroughoutthisperiod.
WATERLEACHING
Curingbamboothroughleachingthesapfromwithintheculmremovesthesugarsandstarchesthatattractmostpests.Thisrelativelysimpleprocessisundertakenasquicklyafterharvestingaspossiblebecausecellswithintheculmbegintocloseafter2‐3days.
Commonlybambooisimmersedinflowingwaterfor4‐12weeks(dependingonthespecies),withstoneweightsappliedtokeepthebamboofullyimmersed.Insomepartsoftheworldbambooisleachedinsaltwaterasthesaltoffersadditionalpestresistance.Generallythisisnotrecommendedassaltwatertakeslongertopenetratetheculm,andtheimbeddedsaltsalsoraisethehydroscopiccapacityofthefibersleadingtomorerapidrotting.
Analternativemethodofleachingoutsapsinvolvesstandingthebamboouprightinlargedrumsfullofwaterfor3‐4days,toallowthebambooplanttodrawinthewaterandclearoutititsownsap.Thismethodcanalsobeusedasalow‐techmethodforinjectingboraxtreatment.
AIRDRYINGVSKILNDRYING
Bamboothathasbeenproperlydriedpriortousewillhavemoreconsistentdurabilitythanbamboodriedinposition.Airdryingofbambootakesaround6‐12weeksdependingonspecieswhilstslowkilndryingtakes2‐3weeks.Solarkilnsthattrapandstoretheenergyfromthesun,offeralowenergycostcompromiseof3‐6weeks.Kilndryingmaybenecessaryduringtherainyseasonwhenbamboomaybegintobeaffectedbymouldwhilstdryingout.
Whendryingbamboo,careshouldbetakentoprovideregularsupportandallowsufficientspacearoundtheculmsforevaporation.Therateatwhichbamboocanbedriedvariesfromspeciestospecieswithsomespeciessplittingmorereadilythanothers.Speciespronetosplittingcanhavetheirdryingratesloweddownbytheapplicationofasealantsuchaspainttotheends.
WATERLEACHING
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TRADITIONALLYHOUSEINPERU,SEALED
THENSMOKEDUPONCOMPLETION
B.3.3PROTECTIONTHROUGHTREATMENT
Thedurabilityofbamboocanbegreatlyextendedthroughtheapplicationofarangeoftreatments,rangingfromnaturalandlowtoxicitythroughtotheuseofpesticidesandpreservatives.Naturalandlowtoxicitytreatmentsaregenerallymostsuitedtohumanitarianprojectsandhencearecoveredhere.Informationonpesticidebasedtreatmentsisreadilyavailablefromcommercialmanufacturers.
NATURALTREATMENTS:SMOKING
Smokingisoneoftheoldesttraditionalmethodsofpreservingbamboo,withalongtraditionofusageinsuchareasasLatinAmerica,JapanandChina.Smokefromburningtimberorbamboocontainsarangeofpreservativeandprotectivechemicalssuchascreosoteandfuransthatcanmakebamboosignificantlylessattractivetoarangeofpests.Additionally,theheatingprocesskillsoffexistingpestinfiltrationswhilstinsomecasesalsopartiallyplasticizingthelignininthebambooandhenceincreasingitsdurability.
Thereareabroadrangeofmethodsforsmoke‐treatingbamboo,thesimplestinvolveplacingsmallitemsaboveanopenfireforextendedperiods,whilstthemostcomplexinvolvelargestackedsealedkilns.Insometraditionalcultures,completedhousesweresealedandsmokeduponcompletion.
ResearchinJapanandChinashowsthatthroughsmokingandsteamheatingbamboowithaprecisecombinationoftemperature,humidityandtiming,thecelluloseandligninwithinthecellularwallcanbemadetoplasticize,greatlyincreasingthebamboo’stubularstrengthanddurability.
Smokingbamboooveranopenfireisgenerallyonlysuitableforsmall‐scaleapplicationssuchashandicrafts.Itisoftentraditionallyusedforpreservingbamboostringsandspinesusedinthatchedroofing.Mildongoingopenfiresmokingmayalsobeusedtokeepstacksoffreshlycutbamboofreeofpestsbetweenthetimeofcuttingand
deliverytomarkets.
Largescalesmokingprojectswillrequirelargekilnsandarethereforemostappropriateforongoinghumanitarianordevelopmentprojects.Theseinvolveheatingbambootobetween120and200°Cforbetween12and48hoursdependingonthespecies.Aswithmosttreatments,flattenedbamboosectionssuchasthoseusedforflooringandwallingcanbetreatedmorerapidly.Punchingthroughnodescanalsoimprovesmokepenetration.Exacttimesandtemperaturesmayvarygreatlyfromspeciestospeciesandhencewillrequiresite‐specificresearch.
InLatinAmerica,multi‐functionalkilnshavebeenestablishedusingthewastebambootipsfromharvestingforfuelwhilstproducingbi‐productsofbamboovinegar,creosoteandfuelcharcoal.AtthetimeofwritingnoknownexamplesexistinAsia.
NATURALTREATMENTS:MUDANDSALT
26
OIL‐BASEDTREATMENTPRODUCTSAPPLIEDTOTHE
SURFACEORWOVENBAMBOOSHEETING
InmanytraditionalcommunitiessuchasinruralIndonesia,bambooistreatedbysoakingforprolongedperiodsineithermudorseawater.Bothsystemsrequireapproximatelyonemonthofimmersiontoleachthesugar‐ladensapfromwholeculms.Mud‐basedsolutionsofferanadditionalminorprotectionofanoutermudlayerwhilstthesaltinseawatermakesthebamboounpalatable.Neithersystemisconsideredhighlyreliableoreffectivebutmayworkwellenoughwhencombinedwithanoverallprotectionprogramthatincludesgooddesignetc.Note:saltsolutionswillincreasethepotentialforrotbyraisingthewickingcapacityofthebamboo.
CHEMICALTREATMENTS:EXTERNAL
Arangeofexternaltreatmentscanbeappliedtobambootoincreaseitsresistancetofungusandpestattack.Suchtreatmentsmayincludetheapplicationofkerosene,camphor,commercialpesticidesandvarnishorpaint.Thehighsilicacontentintheouterskinofbamboocommonlyresultsinlowabsorptionrates,withpestresistancebeingachievedmorethroughthebamboobecomingunattractivetopestsratherthanactuallybeingtoxic.Externaltreatmentsneedtobereappliedatregularintervals.Onceevery2‐3monthsiscommonforkeroseneoronceeverysixmonthsforvarnishes.
Ingeneral,externaltreatmentsarenotconsideredtobeveryeffective,althoughpaintorvarnishcanprotecttreatedbamboofromleachingwheresomeexposuretorainisunavoidable.
Treatmentssuchassumpoil,bituminoustarandcreosoteareoftenusedonbamboopolesinserteddirectlyintotheground.Whilstsuchtreatmentsdoincreasethepestresistanceofthepoles,mostbamboospecieshaveverylowdurabilitywhenindirectcontactwiththegroundandsuchtreatmentsprovidefarlessprotectionthanaraisedfooting.
PESTICIDES
Arangeofpesticidescanbeusedtoincreasethepestresistanceofbamboo.CommonlyusedpesticidesincludePCP,DDTandDieldren.Mostpesticidesprovidelittlegreaterprotectionthanboron‐basedtreatments,buthaveahighercostandincreasedenvironmentalandhealthrisks.Hencethesetreatmentsarenotrecommendedforhumanitarianprogramming.Oneexceptionmaybethegrowingmarketincommerciallypressuretreatedbambooproducts(using3rdgenerationpesticides),largelyfromChina.Theseproductsincludelaminatedbeamsandflooring,whichmaybeappropriateformoreindustrialhumanitarianapplications.
BORON‐BASEDTREATMENTSYSTEMS
27
BORONCRYSTALS
Themostcommonandwell‐documentedbambootreatmentsystemsinvolvedissolvingacombinationofboraxandborasicacidinwaterinconcentrationsofaround5‐10%andthensoakingthebamboointheliquiduntilthesolutionhaspenetratedcompletelythroughoutthebamboo.Penetrationtimevariesgreatlydependingonthesystem.Boraxisarelativelyharmlesscompoundwhoseminusculeparticlesizeallowsittoeasilypenetratethroughoutbamboowhendissolved.
Boraxandborasicacidarenaturallyoccurringboron‐basedcompoundscommonlyavailableassodiumborate,sodiumtetraborate,ordisodiumtetraborate.AcommoncommercialproductisTim‐bor.Boronsaresuppliedasawhitepowderconsistingofsoftcolorlesscrystalsthatdissolveeasilyinwater.Bambootreatmentsgenerallycombineamixtureofboronandborasicacidforpestresistancewiththeacidprovidinganaddedadvantageasafireretardant.
Thereareawiderangeofwell‐documentedsystemsforembeddingboraxandborasicintobamboo.Itisimportanttoweighuptherelativeadvantagesanddisadvantagesofeachsysteminrelationtotheprogramyouareplanning.Somesystemsarebettersuitedtolong‐termmassproductionwhilstothersarebettersuitedtoshort‐termcommunity‐levelproduction.
Boraxtreatmentsystemscanbebroadlybrokenintotwogroups:pressurefeedandsoakage‐basedsystems.Pressurefeedsystems,suchasthewell‐knowngravity‐fedBroucheriemethod,utilizethefluidtransportationsystemoftheplant,byattachingapipetooneendoftheculmandpumpingboraxsolutionthroughtheplantsvascularsystem.Pressuretreatmentmethodsareconductedwithinthefirstfewdaysofharvestbeforecellularcollapsesetsin.Thesesystemsoffertheaddedadvantageofpurgingtheremainingsapfromtheculm,thusreducingtheneedforleaching,withtheassociateddisadvantageofneedingtobeundertakensoonaftercutting.Perhapsthebestdocumentedpressure‐fedsystemsisthemodifiedBroucheriemethodinwhichapumpisusedtoforcesolutionfromthethickendofaculm.AlesserknownsystemthatisbettersuitedforvillagelevelproductionhasbeendevelopedbyARTIinIndia,usinghandpumpsattachedtothethinendoftheculm.
Soakagesystemsaregenerallysimplerthoughslowerthanpressurefedsystems,involvingtheimmersionofbambooforlongenoughthattheboraxsolutionpenetratesthroughouttheculm.Soakagesystemsrequirethepunchingoutofnodesorthedrillingofholesbetweennodestoallowcompletepenetrationoftheboraxsolution.Thesimplestsoakagesolutionsinvolvesoakingfor3+days,dependentonthespecies.PerhapsthebestdocumentedsysteminIndonesiaistheVerticalSoakDiffusion(VSD)systemaspracticedanddocumentedbytheEnvironmentalBambooFoundation,C.V.IndobambooandP.TBambuinBali.ForVSD,bambooculmsarestoodverticallywithallnodesexceptthebottomnodepunchedthrough.Theculmisthenkeptfilledwithboraxsolutionforanumberofdaysuntilfulldissipationhasoccurred.
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29
B.4LOGISTICSANDHANDLING
Thecarewithwhichbambooishandledandtransportedfromthemomentofcuttingtofinalplacementwillhaveadirectbearingontheusablelifespanoftheendproduct.
TRANSPORTATIONANDHANDLING
Theneedforcarewhentransportingandhandlingbamboogrowsinimportancewiththedurationandcomplexityofthetrip.Bambooshouldbe:
• Coveredduringtransportationtopreventexcessivedryingandsplittingofuppermostculms.• Protectivesheathesshouldbeusedbetweenropesandbambootopreventdamage.• Thebottomlayerofbambooshouldbecheckedcarefullyforcrushing,todeterminemaximum
weightloading.Thelightweightnatureofbamboomeansthisisgenerallynotaproblem.
Tripsinvolvingtransportationbyseaneedtoincludeadequatestepstopreventmoulddamage.Bamboopackedinsidecontainersshouldincludesomeformofmoistureabsorptionstrategy,thesimplestofwhichistheinclusionofsacrificialsacksoflimeorcement.
Whenloadingandunloadingbamboo,careshouldbetakentoensurebambooisnotthrowntothegroundasthiswillcausecracking.Suchcracksmaynotbevisibleattimeofunloadingbutwillbroadenasthebamboodriesinsitu,weakeningthefinalstructure.
Thewaxylayerandfungusontheouterlayerofbamboomaycauseskinirritation.Workershandlingbamboocontinuouslyshouldbeprovidedwithgloves.
STORAGE
Bambooshouldbestored:
• Freeofgroundcontacttopreventpestinfestation.• Stackedhorizontallywithregularsupportat2‐3
nodeintervalstopreventwarping.• Undershadetopreventunduecracking.• Withadequateairflowaroundculmstopreventmould.
Storageyardsshouldbe:
• Keptcleanandfreeofsawdustandcuttingwastetopreventpestinfestation.• Stockshouldberotatedregularlythroughtheyardensuringnostockisleftforprolongedperiods.If
storingformorethan1‐2weeksbambooshouldbeturnedoverregularlytoensureevendryingandreducethepotentialformouldgrowthorpestinfestation.
Iscommunity‐basedprocurementpossible?
Directprocurementbythecommunitymayinjectupto8timesasmuchfunds
andcanreduceunnecessarystorageandhandling.Considerlogistics&
procurementtraining.
30
Building
KeyPoints
• Bambooisaverydistinctconstructionmaterialwithitsownuniquesetofpositiveandnegativecharacteristics.Agoodunderstandingofthefundamentaldifferencesbetweenbambooandotherconstructionmaterialsisessentialtotheimplementationofsuccessfulbambooprojects.
• Howwellabamboobuildingisdesigned,constructedandmaintainedwillgreatlyaffectthedurabilityofthestructure.
• Wovenbamboosheetingprovidesacheapefficientresourceforwallingandflooringmaterial.Communitiesneedtobeengagedtodefinequalitycriteria.
• Workingwithcommunitiestodefineongoingmaintenanceprocedurescangreatlyenhancethelifeexpectancyofanybamboostructure.
SectionC
Building1. Generaldesignprinciples2. Designingwithbamboo
3. Construction4. Wovensheeting5. Maintenance
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C.1DESIGNINGAPROGRAMTHATUSESBAMBOO
Havingalreadymadethedecisiontousebamboo,anumberofkeyquestionsshouldbeaskedpriortocommencingdesignoftheprogram:
Howmuchbamboowilltheprogramneedandhowwillthisimpacttheaffectedcommunity’sresources?
• Cantheprogramincorporatereplanting?• Canprocurementbediversified?
Approximatelyhowlongarethebuildingsexpectedtobeinhabitedfor?
• Doesthebambooneedtobetreated?Ifso,whichsystemismostappropriate?• Isthedesigndurableenoughforthetimeframe?• Whatjointingsystemisappropriateforthetimeframe?
Whatfuturerisksarethebuildingslikelytofaceandhowcanwemitigatethoserisks?
• Adverseweathersuchasintenserain,coldorheat?• Futureclimaticevents?
Whatskillsandresourcesdoesthecommunityhavetobuildandmaintainthestructures?
• Willtheprogramneedtoincludecapacitybuildingortraining?• Willtheprogramneedtoincludesupplyoftoolsorongoingsupport?
Whatisthetimeperiodoftheprogram?
• Whatistheexitpoint?• Howrapidlydobuildingsneed
tobebuilt?
Improve
Monitor
Plan
Implement
32
C.2DESIGNINGWITHBAMBOO
Designingandbuildinginbamboorequiresanunderstandingofdifferentdesignandconstructionprinciplestothoseusedwithothercommonbuildingmaterialssuchastimber,steel,concreteorbricks.
Inlength,bambooprovideshightensileandcompressivestrength,whilstitstubularstructuremeansthatitismuchweakeracrossitswidthwhereitispronetocrushing,exceptatnodes.Bamboo’sflexibilityacrossitslengthallowsforhighlevelsofshockabsorption,whilstalsoprovidingrealpotentialforthedesignofcurvedelementsheldintension.Bamboopolesinconstructionwillsupporthighloadsaslongasthebuildingisconstructedsothepolecannotbuckle.
C.2.1COMPARATIVECHARACTERISTICSOFCOMMONCONSTRUCTIONMATERIALS
BAMBOO TIMBER STEEL MASONRY
STRENGTH• Tensilestrengthofmildsteel
• Weakinsidecompression
• Stronginsidecompression,tensionandlength
• Weakinlengthwisecompression
• Hightensilestrength
• Highcompressivestrength
• Lowtensilestrength
DURABILITY• Lowdurability(1‐2years)
• Unlesscuredortreated(10‐25years)
• Durabilitydependantonspeciesandexposure(from2‐3yearsto20‐30years)
• Highlydurable(10‐30years)
• Highlydurable(20‐50years)
FLEXIBLITY• Extremelyflexible,particularlyinsplitsections
• Limitedtosmallsectionsorcomplexsteambending
• Highlyflexible:canbeformedtowhatevershaperequired
• Inflexible
• Rigidstructure
JOINTING• Lowtechnology
• Boltingorpegging
• Lashingortying
• Nailinglimited• Simpleandlowcost
• Mediumleveltechnology
• Screwing,nailingandbolting
• Mediumcost
• Hightechnology
• Screw,weld,rivet
• Highcost
• Mortar
• Lowcost
SPPED• Extremelyfast• 1weekpershelter
• Medium• 1‐3weekspershelter
• Rapid• 1weekpershelter
• Slow
• 4‐6weeks
AVAILABILITY• Availableinlargequantitiesacrossmostdisaster‐pronetropicalareas
• Globallydiminishingresource
• Environmentalconcerninmanydisaster‐affectedcountries
• Highavailabilityalthoughmayfrequentlyneedtobeimportedtoarea
• Highlyavailableinmostareas
• Varietyofoptions
33
THEDEADLOADOFABUILDINGSWEIGHTVSTHELIVELOADTHATABUILDINGEXPERIENCESDURINGUSE
EFFECTOFWINDLOADONBUILDINGS
WITHANDWITHOUTBRACING
COST(BASEDON24M2
SHELTER)
• Extremelylowcost
• $100‐300
• Mediumcost
• $500‐1000
• Highcost
• $2000‐5000
• Mediumtohighcost
• $1000‐5000
C.2.2DESIGNPRINCIPLES
Anumberofkeydesignprinciplesneedtobeconsideredwhenplanningaprojectinbamboo.Tounderstandtheseprinciplesitisimportanttofirstunderstandsomebasicprinciplesofconstruction.
NOTE:Thismanualdoesnotintendtobeadesignbookforengineers,butratheraimstoprovideguidanceforhumanitarianworkerstoensuretheyhaveaskedthecorrectengineeringquestionsandincorporatedsimplegoodpracticeintotheirwork.Althoughingeneral,simpleemergencyandtransitionalsheltersolutionsdonotrequirecomplexengineering,itisclearlybestpracticetoensurethatsuchmassprogramshavebeencheckedbyaskilled(preferablylocal)professional.Wheresuchresourcesarenotavailableconsiderusingplansthathavealreadybeendesignedandtestedorseekmoredetailedtechnicaladvice.SeeSectionD.1Furtherresources.
LIVEANDDEADLOADS
Buildingsareexposedtotwomaintypesofforces,deadloadsandliveloads.Deadloadsarethestaticforcesthatapplysuchastheweightoftheroofbearingdownonthestructure,whilstliveloadsincludethedynamicchangingloadsthatabuildingwillhavetocopewithoveritslifespan,suchastheweightofthechangingnumberofpeopleinsideit,windforces,pressurecausedbygroundmovementinanearthquakeorwaterpressureinaflood.
Whendesigningabuilding,itisessentialtoconsidertherangeofliveloadsthebuildingwillbeexposedto.Thisisofparticularimportanceinwhenworkingindisasterproneareaswherethelikelihoodoffloods,highwindsorearthquakesmaygreatlyincreasethestressloadingsthatabuildingmayhavetocopewith.
MOMENTUMANDBRACING
Whenbuildingssuffersuddenloads,suchasthoseexperiencedinanearthquake,theymaytwistorwarp.Suchmovement,combinedwiththemassofthestructure,cancreatehighlevelsofmomentum,greatlyincreasingtheeffectiveweightorforceloadthatisappliedacrossthebuilding.Muchofthisforcewillbetransferredtothejointsofthebuilding,makingthem
34
Correct
DETAIL: Top plate with fish‐plate where posts intersectbetweennodes.
theweakpointinmoststructures.Thisisparticularlysointhecaseofbamboo.Theinclusionofbracingacrossinallplanesofthestructurereducesthepotentialloadonjoints.
DESIGNFORADAPTABILITY,REUSE,MAINTENAINCEANDDECONSTRCUTION
Whendesigninganybuilding,considerationshouldbegiventothefuturepotentialusageandlifecycleofthebuilding.Temporarysheltersbytheirverynaturehavealimitedlifeintheoriginaldesignformat.Itisimportanttoconsultwithcommunitiesabouthowsuchstructuresmaybeusedinalongertimeframeandtakethepossibilitiesintoconsiderationatthedesignstage.InmanycasessuchastheYogyakartaearthquakeresponse,transitionalshelterswentontoperformarangeofrolessuchasshops,stables,kitchensandsparerooms.Manyshelterswerealsodismantledforreuseinthepermanenthome.Temporarysheltersalsooftenbecomethecoreforapermanentconstruction.
Designfordeconstructionandreusecanbeachievedthroughtheuseofnonpermanentjointssuchasboltingandlashing.Wallscanbedesignedforfuturemasonryroofloadseventhoughanagencyisonlysupplyingtarpaulinroofing.Thedecisiontotreatbambooforframingmayencouragethereuseofsomeelementsoreventhewholeshelterinpermanentconstruction.
DESIGNINGFORBESTNODALPLACEMENT
Nodesarethestrongestpointinthecrosssectionoftheculmofbamboo,hencethecloserajointistoanodethestrongerthejointwillgenerallybe.Asaruleofthumbideallyjointsshouldbenofurtherfromanodethanthewidthofthebamboosectionsthatarebeingjoined.
Insayingthis,itisimportanttorecognizethatfastidiouslyselectingbambooforexactingnodalplacement,althoughcreatingastrongerstructure,mayconsumemuchmoretimeandpotentiallymorebamboo.Henceitisimportanttofocusonjointsofhigherstructuralpriority,ensuringnodesoccurascloseaspossibletothesejoints.
Anumberofstrategiescanbeengagedtoimprovejointstrengththroughbetternodalplacement:
Sheathing
Wherejointsdooccurbetweennodesitispossibletostrengthenthejointbyusingsheathesorfishplatestospreadtheloadacrossthespacingbetweennodes.
35
JOININGAFLOORJOISTORTOPPLATETOACOLUMN
ROOFTRUSSWITHJOINTSRUNNINGTOTHENEARESTNODE
SACRIFICIALFOOTING
Bearingontonodaljoints
Jointdesignscantakeadvantageofthestrengthofnodesbybearingmoredirectlyontothem.Notethetwodiagramstotherightwherepinsarecorrectlylocatedclosetonodes.
Note:Whenanalysingthediagramsbelow,considerwherethedownwardforcesapply.
Thenearestnodepastthejoint
Unlike whenworking withtimber,jointscan oftenbegreatly
36
strengthenedsimplybyallowingeachmemberofthejointtocontinuepastthejointtobeyondthenearestnodebeforecutting.
37
C.3CONSTRUCTION
GLU
EING
NAILED
SCREW
ED
WIRED
TIED
PEGGING
PEGGED
&
TIED
BOLTING
SKETCH
FILLED
&
BOLTED
SKETCH
Thefollowingchapteroutlinesthebroaderconceptsbehindconstructioninbamboocoveringjointingsystems,framing,walling,flooringandroofing.Therearemanyoptionsavailableforeachofthesecomponentsandthechoiceofwhichsolutionstouseishighlydependentontheneedsandabilitiesoftheaffectedcommunity.Hencethischapterdoesnotfocusonprovidinganyonesolutionbutratheranoverview.
38
C.3.1STAGINGCONSTRUCTION
Inplanningtheconstructionofanydwelling,anumberofissuesshouldbeconsidered:
Set‐outandsitepreparation
• Isthedrainageoffthesiteadequate?• Accesstosanitation• Safetyfromremnantbuildings• Safetyfromfurthereventssuchasfloodandlandslide• Considerimpactonfuturepermanentconstruction
Foundationsandfootings
• Isthereadequatetie‐downforwindloadandearthquakesinthearea?
Framing
• Ensureadequatetemporarybracingduringconstructionaswellaspermanentbracing• Istheframestrongenoughforfutureroofloadsandliveloads
Roofing
• Sufficienteavestoprotectwalls
Cladding,doorsandwindows
• Isthereadequatesecurityforreturntowork?• Isthereadequateventilationandprivacy?
39
C.3.2JOINTINGSYSTEMTYPES
Differentjointingsystemsofferdifferingrelativemerits(seebelowforcomparison).Thechoiceofjointingsystemshouldbebasedontherelativeimportanceofthesecharacteristicstotheprojectathand,aswellastakingintoconsiderationlocalskillsandconstructionknowledge.
Relativemeritsofbamboojointingsystems Strength Usability Cost
JointType Notes
Durab
ility
Rigidity
Streng
th
Flexibility
Easeofu
se
acrossjo
ints
Spee
d
Lowlabo
ur
Chea
pmaterial
Fewtoo
ls
Bolts • Crushingofthebamboomustbeavoided• Onlyasstrongasthebambootheypassthrough• Bestwhenbracedinalldirections
5 5 5 2 3 4 2 2 2
Fill&bolt • Createsaveryrigidjoint• Particularlywellsuitedtofootingconnections
andindustrialloads5 5 5 2 2 3 1 1 1
Glue • Theouterskinofbambooishighlyresistanttogluewhilsttheinnerlayersgluewell
• Particularlysuitedtolongitudinaljoints4 4 4 1 2 1 2 3 3
Rubberstrap • Arangeofre‐usedrubber(suchasoldinnertubes)canbeused,butbewarethattheymaybreakdownunderUVexposure
• Heavilydependentonhowitisattachedtothebamboo(oftenpoorlynailed)
• Hardtofindconsistentsupply
3 2 2 5 4 4 4 4 4
Nails • Pronetosplitting,particularlyinrunningspecies• Pre‐drillingorchisellingwillreducetendencyto
split• Bestsuitedtotemporarystructuresand
clumpingspecies
2 1 2 3 5 4 5 5 5
Pegs&rope • Seeseparatenotesunderpegsandropes• Labour‐intensive,strongandlowtech
4 3 4 4 2 5 2 3 2
Pegs(dowels)
• Commonlymaybetimberorbamboo• Requirepre‐drilling• Strengthdependentonnodetojointplacement
3 2 3 3 3 4 3 4 3
Plywood&bolts
• Commonlyfortrussesorstructuralload• Boltlocationsshouldstillaligntonodes
5 5 5 3 2 4 2 1 1
Ropeorrattan
• Oftenwellknownatvillagelevel• Arangeofmaterialscanbeused:seeklocal
advicefortraditionalmaterials3 2 3 5 3 4 4 5 5
Screws • Pronetosplitting‐requirespre‐drilling• Bestsuitedtojoiningbamboototimber
2 2 2 2 3 4 4 4 4
Wire • Pronetorustatendsandknots • Canbeimprovedbyprotective
painting• Will‘digin’underhighload
3 3 3 4 4 5 5 5 4
Best Worst
40
40
Building
C.3.3EXAMPLESOFCOMMONJOINTS
FOUNDATION
Photo
POSTTOBOTTOMPLATEJOINT
POSTTOTOPPLATE
LINTELDETAIL
BRACINGDETAIL
SKETCH Photo SKETCH
RAFTERTOTOPPLATE
ROOFINGTO
BATON
SKETCH Photo SKETCH
41
C.3.4WALLING
Indesigningsimpletransitionaloremergencysheltersfrombamboo,arangeofwallingmaterialsareavailable.Thischapterintroducesthekeyconceptsregardingthemainwallingoptionsandprovidespointersonkeyissuestobeconsidered.
Keyconsiderations
• Isthewallingmaterialthatisbeingconsideredreadilyavailableinthequantityrequired?• Whateffectwillbulkprocurementhaveonthelocalandregionalenvironment?• Whatisthecapacityofthelocalcommunitytosupplyorcreatetheirownwallingmaterials?• Isthechosenwallingmaterialsmustbeculturallyandclimaticallyappropriate?• Canthematerialbereplacedorupgradedwhenitwearsout?
ARANGEOFBAMBOOCLADDINGONTEMPORARYSHELTERS
42
Materialandlifespan
Advantages Disadvantages Notes
Plasticsheeting
6‐18months
• Rapidlydeployedanderected• Lowcost• Water‐andwind‐resistant• Lowimpactonlocalnatural
resources
• Highenvironmentalcost• Littleornoeconomicinput• Lowcommunityparticipation• Shortlifespan• Can’tberepairedorextendedeasily
bythecommunity
• Standardofsheetingusedisimportant.Seeplasticsheetingguidelines
• Mayrequiredifferentplasticsfordifferentclimates
Flattenedbamboo2‐3yearsifprotectedfromtherainand
groundcontact
• Easilymanufactured• Rapidlyerected• Requiresfewspecialisttools• Well‐ventilated:goodforhot
humidclimates• Biodegradablenaturalmaterial• Communitylivelihoodactivity
• Maynotprovideadequateprivacy• Maynotprovideadequaterainand
windprotectionincoldclimates• Limitedlifeexpectancy• Increasedloadonbambooresources
(consideralternativespecies)
• Mustbeculturallyappropriatetothearea
• Mayrequireparticularspecies
• Flattenedbambooiseasilyleachedortreatedtoincreasedurability
WovenBamboo2‐3yearsifprotectedfromtherainand
groundcontact
• Increasedwindandrainprotectionoverflattenedsheeting
• Maysupportlocalhandicraftsindustryandstrengtheneconomicrecovery
• Livelihoodsopportunityfortheaffectedcommunity
• Morelabourintensivemanufacturingthanflattenedsheeting
• Oftendifficulttoprocureinbulkasiscommonlyproducedatvillagelevel
• Highlyvariableproduct,mustnegotiateminimumstandardswithaffectedcommunity
• Sheetingwovenfromouterskinofbambooismoredurablebutcoarser
• Manystylesandpatternsexist,communityconsultationisessentialtoselectappropriatestandards
CompositeSheetingIndefinite‐5‐20years,
dependingonquality
• Mayprovideinsulativecapacity• Livelihoodscreationproject• Maybehighlydurabledepending
ongluesandconstructionsystem• Maybestructural• Maybeplasterableorpaintable,
creatingpermanentstructures
• Complextoproduce• Timeconsumingtoproduce• Mayrequireextensivetrainingor
capitalexpenditureonequipment
• Probablynotsuitedtorapidresponse
• Mayrequireprepositioning
• Worthconsideringforongoinghumanitariansituationsincolderclimates
CementsheetingIndefinite:5‐20years,
dependingonquality
• Highlydurable• Canbeplasteredorpainted• Easilyfastened,repairedand
renovated• Relativelycheappermanent
material
• Extremelyhardtoensureasbestos‐freesheetinginmanydevelopingcountries(particularlyinIndonesia)
• Expensive,heavyandslowtoprocurecomparedtobambooproducts
• AsbestoscontentisamajorconcernwheneverdealingwithcementsheetinAsiaasitisnotbannedinmostAsiancountries.
CGISheetingIndefinite:5‐20years,
dependingonquality
• Highlydurable• Wallsonlyrequireaverylight
gaugematerial• Relativelycheappermanent
solution• Easytoprocureinbulk
• “Tinshed”feel• Energy‐intensivesolution• Highenvironmentalimpactatsource
andcreation• Relativelyexpensivecomparedto
bambooandothernaturalmaterials
• Highthermalconductivitycanbeproblematicinextremeclimates.
• Difficulttoattacheasilytobambooframing
Timbercladding
Indefinite:5‐20years,dependingonquality
• Durabilitydependantonspecies,butcanbehighlydurable
• Easytoworkwith,repair,extendandmaintain
• Oftenwellknownasamaterialbytheaffectedcommunity
• Potentiallyhighenvironmentalimpact
• Difficulttoprocureinbulk• Requiresexpertiseinspecifyingand
procuring
• SeeHumanitarianTimberguidelines
Alternativenaturalmaterials
Dependentonmaterial
• Widerangeofpotentiallyappropriatematerials
• Potentiallylowenvironmentalimpact
• Oftensupportslocalprocurementorcreationbyaffectedcommunity,speedingupeconomicrecovery
• Oftendifficulttoprocureinbulk• Canbedifficulttomeasurethe
environmentalimpact• Oftenoutsidethesphereof
knowledgeofprofessionalhumanitarianworkerssomayrequiretechnicalsupport
• Worthconsideringinlongertermhumanitariansituationstoreducetheloadonotherresources
• Mayincludesuchproductsasrattan,jute,leaves,grass,barketc.
43
FLATTENEDBAMBOOSHEETINGWALLS
PlasticsheetwallingontransitionalshelterinSewon,Indonesia
PLASTICSHEETING
Duringtheemergencyphaseofmanyhumanitarianresponses,largequantitiesofplasticsheetingarefrequentlydistributedasemergencysheltermaterials.Whencommencingatemporaryshelterprojectinbamboo,itmaybeappropriateforthismaterialtobeusedastemporarywallinguntilamorepermanentsolutioncanbefound.Onesolutionistheplanningofastagedinterventionprograminwhichaninitialplasticsheetingdistributionisthensupplementedwithbambooforbuildingashelterframe,followedbyroofingmaterials,atwhichpointplasticsheetingisusedorwalls,finallyfollowedbyatop‐upofmoredurablewallingmaterials.Suchprogramsassistcommunitiesontheirpathofrecoveryfromshelterinsecuritybacktopermanentshelterinaffordableandmanageablestages.
FLATTENEDBAMBOO
Bambooculmsthataresimplyflattenedprovideacommonandeasysolutiontobothwallingandflooring.Normallycommunitiesselectparticularspeciesforthisapplicationbasedontheeaseofsplittingandflattening,alongwithadesireforasuitablystrongwallthicknessandarelativelywideflattenedpanel.Communityconsultationisessentialinspecifyingtheappropriatebambooforthistask.
Somecommunitiesmayperceiveflattenedbambooasinadequateforwallingduetolackofprivacyorexcessiveventilationfortheclimate.
Theincreasedexposedsurfaceareainflattenedbamboomakesitidealfortreatmentthroughleachingorboraxsolutiontoincreaseitslifeexpectancyinconstruction.
44
PHOTO:WOVENBAMBOOSHEETINGWALLS
WOVENBAMBOOSHEETING
Ahugediversityofwovenbamboosheetsexistacrosstheworld.Thisdiversityreflectsnotonlytheintendeduseoftheproductbutalsothecharacteristicsofthebamboobeingusedandisoftenanexpressionofthecultureorbeliefsofthecommunityproducingthesheeting.
Thinnersheetsutilisingtheinnercoreoftheculmofbambooarecommonlyusedforinteriorwallsandfloormats,whilesheetswovenfromtheouterskinofferhighpestandrainresistanceandaremorecommonasoutdoorcladdingmaterials.Coarsewovensheetingmaybeusedforanimalenclosuresorfences.
Whenprocuringwovensheetingitiscriticaltoinvolvetheaffectedcommunityindetailingminimumspecifications.Arangeofcultural,historical,religiousandclimaticfactorsmayinfluencewhatacommunityfeelsisappropriateinawovensheeting.Incoldmountainclimates,tightnessofweavemaybecriticalwhilstincoastalcommunities,alooseweavebutamoredurableouterskinmaybemoreappropriate.Incolderclimates,wovensheetingwallscanbealsoplasteredwithcement,newspaper,plasterormudtomakeitwindproof.
45
C.3.5FLOORING
Thissectionisnotyetfinished.Updateswillbemadeavailableonthewebsite.
46
C.3.6ROOFING
Material Advantages Disadvantages Notes
Plasticsheet• Rapidlydeployed• Rapidlyerected• Lowcost• Waterandwindresistant
• Highenvironmentalcost• Littleornoeconomicinput• Lowcommunityparticipation• Shortlifespan• Can’tberepaired,extended
easilybythecommunity
• Standardofsheetingusedisimportant.Seeplasticsheetingguidelines
• Mayrequiredifferentplasticsfordifferentclimates
Thatching• Highcommunity
participation• Biodegradableand
renewable• Boostlocaleconomy• Costeffective,insulative
• Difficulttoprocureinbulk• Requiresspecialistknowledgeon
selectionandspecification• Highfireriskindense
applications• Potentialdeforestation
• Wellsuitedtoremoteareas,lessinurban/peri‐urban
• Largescalehumanitarianshelterplanswiththatchingmayrapidlydepletelocalresources
Corrugatediron• “Waterprooftopto
bottom”• Well‐suitedtobulk
procurement• Canbeverydurable
• Accentuatesheat• Rusts• Mayprovehazardousifpoorly
fastenedinhighwindareas• Limitedimpactonlocaleconomy• Highecologicalcost• Expensive
• Decisionmustfitlocalcommunityculturalpractice
• Sheetgaugeisakeyissueaffectingdurability,aslightweightsheetsarecommonlyavailable
• Appropriatetoolsandsafetyequipment
Rooftiles• Highlysuitedtolocalsmall
scaleproduction• Canoftenbeprocuredata
communityorregionallevel
• Maybesuitableasatopupprogramusingrecoveredtiles
• Easilymovedfromtemptopermanentshelter
• Relativelylowcost
• Asapatchworkofwaterproofelementstilesprovidealessreliableprotectionthancontinuousroofingmaterials
• Requireaminimumpitchof12+degrees
• Increaseddangerduringbuildingcollapse
• Thechoicebetweencementandclaytilesshouldbemadebasedonavailableaggregateandsoil
• Qualityvariesdramaticallybasedonproductionprocedures
• Environmentalimpactoffuelsourcemustbeconsideredforclaytiles
Cementsheeting• Lightweight• Easilytransported• Canbemadelocallyor
procuredinbulk• Easytoworkandhandle
• ManycountriesinAsiacontinuetosellhighlycarcinogenicasbestos‐reinforcedsheets.Inunder‐regulatedcountries“asbestosfreesheets”maywellstillcontainasbestos.
• Safehandlingequipmentandtoolsshouldbeincluded.
• TheuseofcementsheetingbyNGOsmayresultinincreaseduptakeofasbestossheetingbythesurroundingpopulation.Toavoidthis,strongpublicmessagesmaterialshouldbeincludedwithanyprogramusingcementsheet,orelsetheproductshouldbeavoided.
Bamboo• Well‐suitedtoremote
areaswithplentifulbamboosupply
• Costeffective• Suitedtolocal
procurementandjobcreation
• Mayconsumeexcessivebamboo• Simplelappedsectionsarenot
verydurable,thatchingandshinglesaremuchmoredurable
• Smokingmayimprovedurability,althoughboraxtreatmentwon’t
• Awiderangeofbambooroofingsolutionsexist.Theseinclude:
• Lappedbamboosections• Bambooshingles• Bamboostripthatching
Building
47
47
KeyPoints
Thisdocumentoffersonlyabriefintroductiontotheuseofbambooinhumanitarianshelterprogramming.
Toundertakealargescaleprogramitwillbeimportanttoseekmoredetailedinformationspecifictothecontextoftheprojectbeingundertaken.Thissectionoftheguidelinessuppliessomeadditionalresourcesorlinkagestothoseresources.
Therearearangeofotherusesforbamboothatmaybeworthconsideringinhumanitarianprogrammingsuchascompositepanelsandlaminatedbamboobeams.
Understandingwherebambooresourcesareavailablemayinfluencedecisionsregardingthesuitabilityofusingbambooinanygivenhumanitarianresponse.
SectionD
Support1. Furtherresources
2. Furtherusesofbambooinhumanitarianprogramming
3. BambooinIndonesia
48
D.1FURTHERRESOURCES
ArangeoffurtherresourcesareavailablefromtheHumanitarianBamboowebsiteatwww.humanitarianbamboo.org.Ifyouhaveanadditionalresourcesorlinksthatyoubelievemaybeofvaluetootherhumanitarianpractitionerspleasecontacttheprojectthroughthewebsite.
Resourcesavailableonthewebsiteincludephotographsofbambooprojects,bambooreferencedocumentsandlinks.
D.1.1INTERNETRESOURCES
BAMBOO‐RELATED• Globalorganisations
o www.inbar.org • BambooexpertsinIndonesia
o www.bamboofoundation.org• BambooplantstocksuppliesinIndonesia
o www.bambunusaverde.comSHELTER‐RELATED
• www.humanitariantimber.org• www.sheltercentre.org
D.1.2ORGANISATIONS
Abroadrangeoforganisationsexistthatmaybeabletosupplyadditionalinformationtohumanitarianpractitionersontheuseofbamboo.Theseinclude:
INDONESIA
• EnvironmentalBambooFoundation(EBF),Bali• C.V.Indobamboo,Bali• P.TBambu,Bali• DepartmentofEngineeringandArchitecture,UniversityofGajaMada,Jogyakarta• BandungInstituteofTechnology,Indonesia• DepartmentofPublicWorks,BuildingResearchcentre,Bandung
INTERNATIONAL
• INBAR,TheInternationalNetworkforBambooandRattan
49
D.1.3BOOKS
Hereisashortlistofsomeofthebooksusedinresearchingthismanual.
INBAR,andGovernmentofMizoram,2001.AffordableBambooHousinginEarthquakeProneAreas:AnInternationalWorkshopOrganisedbyCBTC,GovernmentofMizoran,andInternationalNetworkforBambooandRattan.India:CBTC.
AIS,AsociaciónColombianadeIngenieríaSísmica,2001.ManualdeconstrucciónsismoresistentedeviviendasenBaharequeEncementado,Bogota:EditorialCarrera.
Farrelly,David,1984.TheBookofBamboo:AComprehensiveGuideToThisRemarkablePlant,ItsUses,andItsHistory.SanFrancisco:SierraClubBooks.
Janssen,Jules,2007.BuildingWithBamboo:AHandbook.Warwickshire:ITDG.
Stulz,Roland,andKiranMukerji,1993.AppropriateBuildingMaterials:ACatalogofPotentialSolutions.Switzerland:SKATPublication.
VonVegesack,A.;Vélez,S;Kries,M.andVitraDesignMuseum,2000.GrowYourOwnHouse.VitraDesignMuseum.
Otto,F,1985.IL31Bambus/Bamboo.Stuttgart:TheInstituteofLightweightStructures.
India:BMTPC.BuildingMaterialsandTechnologyPromotionCouncil(BMTPC).Bamboo:amaterialforcosteffectiveanddisasterresistanthousing.NewDelhi:MinistryofUrbanDevelopment&PovertyAlleviation.
NationalMissiononBambooApplication,2004.TrainingManual:BuildingwithBamboo.NewDelhi:TulikaPrint.
EnvironmentalBambooFoundation,1994.PetunjukKerjaPengawetanDenganSistemBoucherie.JawaBarat:YayasanBambuLingkunganLestari.
50
Bangladesh,transientworkershuts
Wovenbamboobasketforchickens,showingbamboo’spotentialforemergencydomeshelters
D.2FURTHERUSESOFBAMBOOINHUMANITARIANPROGRAMMING
D.2.1PREPOSITIONINGTREATEDBAMBOOSTOCKS
Manyhumanitarianresponseagencieshaveprepositionedstocksoftarpaulins,tentsorotheremergencysheltermaterialsinstrategiclocationsacrossdisaster‐proneregions.Treatedbamboocomponentsforemergencytransitionalshelterscouldpotentiallybestoredinsuchamanner.
D.2.2DESIGNINGWITHCURVEDELEMENTS
Oneuniqueaspectofbamboowhencomparedtotimberisitscapacitytobebentandusedintension.Thisisparticularlytrueofsmalldiameterandsplitsectionsofbambooorbamboothathasbeensteamheated.
Unfortunately,littleinvestigationofthepotentialforthisinhumanitarianresponseappearstohavebeenundertaken.Bangladeshtransientworkers’sheltersconstructedmuchliketunneltentsasusedbytheRedCrossandotheragencies,orwovenbaskets,reminiscentofdometents,bothpointtopotentialareasforfutureresearch.
Advantagessuchaslowuseofmaterialandrapidconstructionofferrealpotentialforcheapandeffectiveemergencyshelter.
Temporarystoragehutmadefrombambooandjute
51
D.2.3BAMBOOCOMPOSITECONSTRUCTIONPRODUCTS
Theexcellentgluingpropertiesoftheinnerfibersofbamboomakeitideallysuitedtotheproductionofawiderangeofcompositeproducts.Manyoftheseproductsmaybeideallysuitedtohumanitarianshelterordevelopmentalhousingprojects,including:
• Parquetryflooring• Laminatedbeams• Wovenbambootiles• Bambooreinforcedconcrete• Bamboo‐basedfibrocement• Bamboopolystyrenecompositepanels• Bambooplasterpanelconstruction
MuchresearchonbamboocompositeshasbeenundertakeninIndonesiabyleadinguniversitiesandresearchinstitutes.OneexampleofthisresearchistheworkconductedbytheDepartmentofPublicWorksResearchCenterinBandung,whereProfessorPurwitohasproducedanumberofcompositematerialsandmodelhouses.SimilarlevelsofresearchhavealsobeenconductedatBandungInstituteofTechnology,UGMandMuhammadiyahinYogyakartaandEBFinBaliamongstothers.MuchofthisresearchoffersrealpotentialforusebythehumanitariansectorinIndonesia.
BAMBOOWATERTANKSANDPIPES
Bamboohaslongbeenusedforarangeofplumbingandirrigationpurposes.AnumberofsuccessfuldesignsexistwithinIndonesiaforthecreationofwatertanksusingbambooastheirbase.Theseincludebamboo‐reinforcedconcretetanksdesignedbyDiangDesa,andtarpaulinandbamboodesignsbyOxfamGB’sPRIMEteam.Thesetemporarywaterstoragesolutionsareeasilyerectedonsitebylocalcommunities,minimisingtransportationstorageandprocurementcosts.
DETAIL1,2&3:DPUBUNDUNGRESEARCHCENTER:BAMBOOFIBREPOLYSTYRENECOMPOSITEPANEL,HOLLOWCOREBAMBOOPANEL,BAMBOOPLASTERHOUSE.DETAIL4:BAMBOORESINCOMPOSITETRUSS,INDIA
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BAMBOOHANDICRAFTSASLIVELIHOODS
Inmanytropicalcommunitiesthemanufactureofhandicraftsfrombambooisanimportantsourceoflivelihood.Bamboocraftworkisoftenproducedthroughsmallhomebasedindustriessupplyingsupplementalorfulltimeincometothosewhomaynothaveaccesstomoremainstreamemployment.
Commonbamboohandicraftsincludewovenmatting,baskets,brooms,toolhandles,platesandbowls,andcutleryandchopsticks.
Theintegrationofawovenbamboosheetinglivelihoodsrecoveryprogramforwallingandfloormatsinemergencysheltersmayassistbamboohandicraftscommunitiesinanearlyreturntoproductiveincome.
BAMBOOASFOODANDFODDER
Bambooshootsareahighlynutritiousfoodcrop,whilstleavesofanumberofspeciescanprovidefodderforcattleandgoats.Bambooshootfarmingmayformanappropriatelivelihoodsprojectoravaluablecomponentofabambooplantationandreplacementstrategy.
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D.4DISTRIBUTIONMAPSOFBAMBOOININDONESIA
TheHumanitarianBambooprojecthopestodevelopfourseparatemapsthatshowareasofavailabilityofbamboospeciessuitableforuseinhumanitarianshelterprogramsacrossIndonesia,brokenupbyusagetype:
• Map1 Speciessuitableforstructuralpoles• Map2 Speciessuitableforgeneralstructuraluse• Map3 Speciessuitableforwovenbamboosheeting• Map4 Handicraftspecies
Mapswillprovide:
• Shadingindicatinghowcommonlyavailablethematerialisineacharea• Namesofthemostcommonspeciesthataresuitableforeacharea
Thesemapsarenotintendedtorepresentanyformofdetailedresearchandmaywellincludeareaslistedasunknown.Thisisasimpleexerciseasrequestedthroughconsultativeforumsbyhumanitarianpractitionersandintendedsolelyasatoolforbasedecisionmaking.
Thesemapsarenotintendedasadefinitivesourceofinformationonbambooavailability.Actualavailabilitymayvarygreatlydependingonanumberoffactorsincluding:
• Changingavailabilityovertime(mapaccurateat2009)• Changingpatternsofusageandthereforemarketavailability• Damagetoresourcebydisasterevents• Environmentalorpoliticalconstraints
Nomapcanhopetoreplacethedetailedinformationthatcanbegatheredthroughgoodcommunityconsultation.
ThefollowingexistingmapshowsaroughapproximationofbamboodistributionacrossIndonesiaasreportedbythestatecensus.
MapfromFAO,Rome(Italy).ForestProductsandEconomicsDiv.;InternationalNetworkforBambooandRattan,
Beijing(China).Indonesiacountryreportonbambooresources,Jakarta,May2005.Rome:FAO,downloadedatftp://ftp.fao.org/docrep/fao/010/ah778e/ah778e00.pdf.
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