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Technical Data

IntroductionAveng Manufacturing Infraset design andmanufacturehighquality,highperformancefactoryengineered precast concrete culverts for use ina wide range of modern construction and civilengineeringprojects.

The company expertise combined with modernmanufacturing facilities and years of experienceenablesAvengManufacturingInfraset toofferanextensiverangeofstandardculvertsaswellasthemanufacturingofnonstandard,projectspecificculverts.

In addition to their exceptional load bearingcapabilitiesandstructuralstability,precastconcreteculvertsrequireverylittleornomaintenanceatalltoexceedtheusefullife.

CLASSIFICATIONOFCULVERTS

TypesofculvertsAvengManufacturingInfrasetoffersthefullrangeof S-Class rectangular portal culverts readilyavailable in lengths of 1.2m. Culverts ranging insizefrom450mmx450mmupto3600mmx3000mmwith Butt-joints are manufactured to the relevantS-Class strength requirements. All S-Class portalculverts bear the SANS mark and are designed,manufacturedandtestedinaccordancewithSANS986:2006:Precastreinforcedconcreteculverts.Reinforced concrete bases are available for allS-Classculvertsandareeasily installedonsite tocompleteastructurallystableengineeredunit.

SAR rectangular portal culverts manufactured toSpoornetloading,NR1983,havethickerdeckandleg sections to accommodate larger fill heightsand imposed loads.Culvertsranging insizes from900mm x 450mm up to 3000mm x 3000mm aremanufactured and unit lengths ranging from 1.2mup to1.5masstated in theproduct tables.SARculvertsareavailablein2strengthclasses,0-5mfilland 5-10m fill. Reinforced concrete bases areavailableforSARculvertsbeingplacedwherethefillheightdoesnotexceedamaximumof5m.

Ribbed skew haunch culverts are designed andmanufacturedtowithstandC-Classloadingconditions,consistingofaverticalproof loadof150kN/mandahorizontalproof loadof30kN/m.Ribbedculvertsrangeinsizefrom600mmx450mmupto3000mmx3000mmandvaryinunitlengthasshownintheproducttables.

AvengManufacturing Infrasetalsomanufacturejackingboxculvertsinvarioussizesandinstandardlengthsof1.190mwhicharemanufacturedwithboltholesforlongitudinalties.

StrengthofculvertsPrecastportalculvertsareclassifiedintermsoftheircrushingstrengthwhensubjectedtoacombinationofloadingcases involvingverticalandhorizontalknifeedgetestsconductedunderfactoryconditions.Theproofloadtestcanbedefinedasalineloadthataculvertmustresistwithoutthedevelopmentofcrackwidthsexceeding0.25mmoveralengthof300mmorovertwoadjacentribsinribbed16culverts.Whenrequired,ultimateloadtestarealsocarriedouttoamagnitudeof25%greaterthantheapplicableproofloads.

Therearethreedifferentloadingconfigurationsthatare applied to precast portal culverts to simulatetheinstalledconditions,namelythedeckbendingmoment,deckshearandtheinnerlegbendingmoment.TheinnerlegbendingmomentisonlytakenintoconsiderationfortheS-Classportalculverts.

LoadsonculvertsS-Classportalculvertsaretestedtoaverticalproofloadwhichisafunctionofthestrengthclassmultipliedbythespanoftheculvert,ahorizontalproofloadof30kN/mappliedtothetopofthelegandahorizontallegloadappliedataheight0.2timestheheightofthe legmeasured from thebottomof the leg forculvertswithaheighttospanrationofmorethat0.5.Thehorizontallegloadisdeterminedbytheverticalloadmultipliedbytherelevantfactor.

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PRECAST CONCRETECULVERTS

AvengManufacturingInfrasetS-ClassculvertsbeartheSABSmarkandaredesigned,manufacturedandtestedinaccordancewithSANS986.

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InstallationconditionsThetrenchconditionoccurswhentheculvertisplacedintoatrenchcutintonaturalgroundandthenbackfilledwithsuitablematerial.

TrenchedInstallation

TemporaryproparrangementNote:ForH>1.5m,providehorizontalpropsat40%heightabovebaseduringbackfillingandcompaction.Onepropperprecastconcreteunit.

Intheembankmentconditiontheculvertisinstalledatgroundlevelandisbackfilledwithsuitablematerial.

Embankmentinstallation

Culvertinprecastbaseconfiguration

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Technical Data

Loadclassifications

SAR portal culverts are manufactured for installations underrailwaytrackanddesignedtotakeaccountoftraintrack,ballastandbackfillloadcombinationsasstatedintheSpoornetLoadingcodeofpractice:NR1983.

Thefillheightabovetheculvert,determinesthestrengthclassof theculverts.AllSARculvertsareavailable in twostrengthclassestosuiteither0-5mor5-10mfillheightconditions.

450 200 200x0.450 30 0.2 0.45600 200 200x0.600 30 0.2 0.45750 175 175x0.750 30 0.2 0.4900 175 175x0.900 30 0.2 0.41200 150 150x1.200 30 0.2 0.41500 100 100x1.500 30 0.3 0.51800 75 75x1.800 30 0.4 0.62100 75 75x2.100 30 0.4 0.62400 75 75x2.400 30 0.4 0.63000 75 75x3.000 30 0.4 0.63600 75 75x3.600 30 0.4 0.6

Culvert Span

CulvertClass

Vertical Proof Load

(kN/m)

HorizontalProof Load

(kN/m)

Horizontal LegLoad Factor

Span > Height

Horizontal LegLoad Factor

Span = Height ExampleA1200x1200150SCulvertmustresist

VerticalProofload=150x1.200=180kN/mUltimateload=180x1.25=225kN/m

HorizontalProofload=30kN/mUltimateload=30x1.25=38kN/m

Leg load (Span = Height)Proofload=180x0.4=72kN/mUltimateload=72x1.25=90kN/m