Du Toan Xay Dung Cong Trinh Dan Dung Va Cong Nghiep 525

7/31/2019 Du Toan Xay Dung Cong Trinh Dan Dung Va Cong Nghiep 525

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CHNG I:

KHI NIM DTON XY DNG CBN

I. TNG DTON XY DNG CNG TRNH:1. Khi nim tng dton:

Tng d ton l ti liu xc nh mc chi ph cn thit cho vic u t xy dng cng trnh c tnh ton c thgiai on thit k kthut hoc thit k k thut - thi cng. Tng d ton cng trnh bao gm: gi tr d ton xy lp, gi tr d ton mua sm trang thit b, chi ph

khc v cc chi ph d phng.2. Ni dung ca tng dton:

Tng d ton xy dng cng trnh c tng hp y cc gi tr cng tc xy lp, thit b, chi ph khc v cc chi ph d phng. Phntch chi tit, hng dn p dng sc gii thiu c thChng 4 (lp d ton cng trnh) y xin nu khi qut nhng ni dung cbn.

2.1. Gi trcng tc xy dng, lp t cu kin, lp t thit bcng ngh (chi ph xy lp)Bao gm:- Chi ph ph v tho dcc vt kin trc c;- Chi ph san lp mt bng xy dng;- Chi ph xy dng cng trnh tm, cng trnh ph trphc v thi cng (ng thi cng, in nc, nh xng...) nh tm ti hin

trng v iu hnh (nu c);- Chi ph xy dng cc hng mc cng trnh;- Chi ph lp t thit b (i vi thit b cn lp t);- Chi ph lp t thit b phi tiu chun (nu c);- Chi ph di chuyn ln thit b thi cng v lc lng xy dng (trong trng hp chnh thu nu c).Gi tr d ton xy lp cng trnh bao gm 3 b phn cbn l:+ Gi thnh d ton;+ Thu nhp chu thu tnh trc;+ Thu gi tr gia tng u ra.

Trong gi thnh d ton th chi ph trc tip chim t trng ln nht, sau l khon mc chi ph chung.a) Chi ph trc tip:

Chi ph trc tip l chi ph c lin quan trc tip n vic thc hin qu trnh thi cng xy lp cng trnh.Chi ph trc tip bao gm:

- Chi ph v vt liu;- Chi ph v nhn cng;- Chi ph v s dng my thi cng.

b) Chi ph chung:

Chi ph chung l mc chi ph khng lin quan trc tip n qu trnh thi cng xy lp cng trnh nhng li cn thit phc v cho cng

tc thi cng, cho vic t chc b my qun l v cho sn xut xy dng ca doanh nghip xy dng.Ni dung ca chi ph chung gm nhiu khon mc chi ph c lin quan n ton b sn phm xy dng m khng lin quan n vic thc

hin xy lp tng kt cu ring bit.Chi ph chung bao gm mt s nhm chi ph ch yu sau:

- Chi ph qun l hnh chnh;- Chi ph phc v cng nhn;- Chi ph phc v thi cng.- Chi ph chung khc: l nhng khon chi ph c tnh cht chung cho ton doanh nghip nh: bi dng nghip v ngn hn, hc tp,

hi hp, chi ph bo v cng trng, phng chng bo lt, ho hon, chi ph trm y t, chi ph skt, tng kt, thu vn sn xut...Do nhng c im phc tp chi ph chung kh c th tnh trc tip vo nhng loi cng tc ring r khi xc nh d ton cng trnh m

c tnh bng t l (%) so vi chi ph nhn cng trong d ton xy lp theo tng loi cng trnh.c) Thu nhp chu thu tnh trc v thu gi tr gia tng u ra:

+ Thu nhp chu thu tnh trc:- Trong d ton xy lp mc thu nhp chu thu tnh trc c tnh bng t l (%) so vi chi ph trc tip v chi ph chung theo tng

loi cng trnh.+ Thu gi tr gia tng u ra:

- Trong d ton xy lp thu sut thu gi tr gia tng u ra c tnh theo quy nh i vi cng tc xy dng v lp t.2.2. Gi trdton my mc thit bcng ngh:Bao gm:

+ Chi ph mua sm thit b cng ngh (gm c thit b phi tiu chun cn sn xut gia cng (nu c) cc trang thit b phc v sn xut,lm vic, sinh hot ca cng trnh (bao gm thit b lp t v khng cn lp t)

+ Chi ph vn chuyn t cng hoc ni mua n cng trnh, chi ph lu kho, lu bi, lu container (nu c) ti cng Vit Nam (i vithit b nhp khu), chi ph bo qun, bo dng ti kho bi hin trng.

+ Thu v ph bo him thit b cng trnh.2.3. Chi ph khc:

Do c im ring bit ca khon chi ph ny nn ni dung ca tng loi chi ph c phn chia theo cc giai on ca qu trnh u tv xy dng.

a) Giai on chun bu t:

- Chi ph cho cng tc u t kho st, thu thp s liu.....phc v cho cng tc lp bo co tin kh thi v kh thi i vi d n nhm Ahoc nhm B (nu cp c thm quyn quyt nh u t yu cu) bo co nghin cu kh thi ni chung v cc d n ch thc hin lp bo cou t.

- Chi ph cho hot ng t vn u t: Lp bo co nghin cu tin kh thi, kh thi, thm tra xt duyt bo co nghin cu tin kh thi,


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kh thi.- Chi ph nghin cu khoa hc, cng ngh c lin quan n d n (i vi cc d n nhm A v d n c yu cu c bit).- Chi ph cho cng tc tuyn truyn, qung co d n.

b) Giai on thc hin u t:- Chi ph khi cng cng trnh (nu c)- Chi ph n b t ai, hoa mu, nh ca, vt kin trc, m m....chi ph cho vic t chc thc hin qu trnh n b, di chuyn dn

c, cc cng trnh trn mt bng xy dng, chi ph cho cng tc ti nh c v phc hi...- Tin thu t hoc tin chuyn quyn s dng t.

- Chi ph ph dvt kin trc c v thu dn mt bng xy dng.- Chi ph kho st xy dng, thit k xy dng.- Chi ph t vn thm nh thit k, d ton cng trnh.- Chi ph lp h smi thu, chi ph cho vic phn tch nh gi kt quu thu xy lp, mua sm vt t thit b, chi ph gim st thi

cng xy dng, lp t thit b.....- Chi ph ban qun l d n.- Mt s chi ph khc nh: bo v an ton, bo v mi trng trong qu trnh xy dng, kim nh vt liu a vo cng trnh, chi ph

lp, thm tra n gi d ton, chi ph qun l, chi ph xy dng cng trnh, chi ph bo him cng trnh, l ph a chnh...c) Giai on kt thc xy dng a dn vo khai thc sdng:

- Chi ph thc hin quy i vn, thm tra v ph duyt quyt ton vn u t cng trnh.- Chi ph tho dcng trnh tm, cng trnh ph trphc v thi cng, nh tm....(tr gi tr thu hi).- Chi ph thu dn v sinh cng trnh, t chc nghim thu, khnh thnh v bn giao cng trnh.- Chi ph o to cn b qun l sn xut v cng nhn k thut (nu c).- Chi ph nguyn liu, nng lng, nhn lc, thit b cho qu trnh chy th khng ti v c ti (tr gi tr sn phm thu hi c)....

2.4. Chi ph dphng:Chi ph d phng l khon chi ph d tr cho cc khi lng pht sinh do thay i thit k hp l theo yu cu ca chu tc

cp c thm quyn chp nhn, khi lng pht sinh do cc yu t khng lng trc c, d phng do yu t trt gi trong qu trnh thchin d n.

II. DTON XY LP HNG MC CNG TRNH:1. Khi nim:

D ton xy lp hng mc cng trnh l chi ph cn thit hon thnh khi lng cng tc xy lp ca hng mc cng trnh . N ctnh ton t bn v thit k thi cng hoc thit k m thut - thi cng.

2. Ni dung dton xy lp:2.1. Ni dung ca n bao gm:

a) Gi tr dton xy dng:

L ton b chi ph cho cng tc xy dng v lp rp cc b phn kt cu kin trc to nn iu kin vt cht cn thit cho qu trnhsn xut hoc s dng cng trnh .

- Chi ph xy dng phn ngm, ng dn nc, dn hi.- Chi ph cho phn xy dng cc kt cu ca cng trnh.- Chi ph cho vic xy dng nn mng, bmy thit b trong dy chuyn cng ngh.

b) Gi tr dton lp t thit b:

L d ton v nhng chi ph cho cng tc lp rp thit b my mc vo v tr thit k trong dy chuyn sn xut (k c cc cng vicchun ba vo hot ng chy th).

2.2. Cc b phn chi ph trong gi trdton xy lp:Khi qut gi tr d ton xy lp c th chia thnh 2 phn ln:Gi tr d ton xy lp trc thu.Gi tr d ton xy lp sau thu.Trong mi phn li bao gm nhng chi ph c th nh sau:

a) Gi tr dton xy lp trc thu gm:

- Chi ph vt liu;

- Chi ph nhn cng;- Chi ph my thi cng;- Chi ph chung;- Thu nhp chu thu tnh trc.

b) Gi tr dton xy lp sau thu gm:

- Gi tr d ton trc thu v khon thu gi tr gia tng u ra.3. Cc bc xc nh gi tr dton xy lp:+ Da vo bn v thi cng hoc thit k k thut - thi cng tnh khi lng cc cng tc xy lp ca cng trnh (tnh tin lng d

ton).+ S dng bng n gi chi tit ca a phng (hoc n gi cng trnh) tnh c cc thnh phn chi ph trong chi ph trc tip.+ p dng cc t lnh mc: chi ph chung, cc h siu chnh.. tnh gi tr d ton xy lp.+ Ngoi ra trong h sd ton cn cn phi xc nh c nhu cu v vt liu, nhn cng, my thi cng cng trnh bng cch:

- Da vo khi lng cng tc xy lp v nh mc d ton chi tit xc nh ra nhu cu ny.

* Ni dung ca cc bc lp gi tr d ton xy lp c biu din bng s ngn gn sau y:Dton nhu cu

VL,NC,MBn v thit k Khi lng


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III. VAI TR TC DNG CA GI TR DTON:+ Xc nh chnh thc vn u t xy dng cng trnh, t xy dng c k hoch cung cp, s dng v qun l vn.+ Tnh ton hiu qu kinh tu t, c csso snh la chn gii php thit k, phng n t chc thi cng.+ Lm cs xc nh gi gi thu (trong trng hp u thu) gi hp ng, k kt hp ng kinh t giao nhn thu xy lp (trong

trng hp chnh thu).+ Lm cs nh thu lp k hoch sn xut, k hoch cung cp vt t, k hoch lao ng tin lng, nng lc xy dng.+ Lm csn v xy lp nh gi kt qu hot ng kinh t ca n v mnh.

CHNG II:

TIN LNG

I. MT SIM CHUNG:1. Khi nim:

Trc khi xy dng cng trnh hoc mt b phn ca cng trnh, ta cn phi tnh ton c khi lng ca tng cng vic c th. Tnhtrc khi lng c th ca tng cng vic c gi l tnh tin lng. V vy phi da vo cc bn v trong h sthit k v cc ch dn kthut do thit k quy nh tnh ra tin lng cng tc xy lp ca cng trnh.

- Bn thit k phi tnh y , chnh xc cc khi lng cng tc lp nn bng tin lng trong h sd ton thit k.Bng tin lng l cn c ch yu v ht sc quan trng khi xc nh gi tr d ton xy lp v d tnh nhu cu s dng vt t, nhn lc,

xe my thit b thi cng cho cng trnh.- Bn thi cng phi kim tra k h sd ton, bt u l kim tra bng tin lng (v sai st thiu chnh xc thng khu ny) trc

khi k hp ng nhn thu.Trong qu trnh thi cng bn thi cng thng xuyn phi tnh tin lng (tng phn, ton cng trnh) theo trnh t thi cng c khi

lng lp k hoch t chc thi cng, giao khon khi lng v thanh ton vi cng nhn, thanh ton khi lng hon thnh vi bn A.Tin lng l cng tc trung tm ca d ton, n l khu kh khn, phc tp tn nhiu cng sc, thi gian v d sai st nht trong cng

tc d ton. Nu tin lng cng tc xy lp xc nh khng chnh xc s dn n sai lch gi tr d ton xy lp ca cng trnh v d ton sainhu cu vt liu nhn cng xe my thi cng phc v thi cng xy lp cng trnh.

2. Mt siu cn ch khi tnh tin lng:2.1.n vtnh:

Mi loi cng tc khi tnh ra khi lng u phi tnh theo mt n v quy nh thng nht nh: m3, m2, kg, tn, m, ci.....v nh mc vcc hao ph v n gi chi ph cho mi loi cng tc xy lp u c xy dng theo khi lng quy nh thng nht .

V d: nh mc hao ph vt liu, nhn cng, my thi cng cho cng tc xy tng c xc nh cho n v 1 m3 tng xy cc loi, vvy tnh tin lng cho cng tc ta phi tnh theo n v l m3.

i vi cng tc trt: nh mc xc nh cc hao ph cho 1 m2 mt trt, v n gi xc nh chi ph cho 1 m2 mt trt, v vy trong tinlng cng tc trt phi tnh theo m2.

Nhng i vi cng tc trt g, pho ch th n gi, nh mc xc nh cho 1 mt di g, pho ch. V vy trong tin lng ta li phi xcnh theo mt di g, pho.

Trong trng hp i vi cng tc sn xut lp dng ct thp th n gi, nh mc li xc nh cho mt tn thp v vy trong tin lngta li phi xc nh theo n v tn thp.

2.2. Quy cch:

Quy cch ca mi loi cng tc l bao gm nhng yu t c nh hng ti s hao ph v vt t, nhn cng my thi cng v nh hng tigi c ca tng loi cng tc nh:

- B phn cng trnh: mng, tng, ct, sn, dm, mi.....- V tr (mc cao, thp, tng 1, tng 2)- Hnh khi, cu to: n gin, phc tp (kh, d trong thi cng)- Yu cu v k thut- Vt liu xy dng- Bin php thi cng

Nhng khi lng cng tc m c mt trong cc yu t nu trn khc nhau l nhng khi lng c quy cch khc nhau. Cng mt loicng tc nhng cc khi lng c quy cch khc nhau th phi tnh ring.

V d: Cng phi tnh tin lng cho cng tc b tng, nhng b tng tng, ct, b tng x, dm, ging, cu thang, mi loi u phitnh ring.

2.3. Cc bc tin hnh tnh tin lng:Khi tnh tin lng cc cng tc ca mt cng trnh ta cn phi tin hnh theo trnh t sau:a) Nghin cu bn v:

Nghin cu bn v t ton th, n b phn ri n chi tit hiu tht r b phn cn tnh. Hiu s lin h gia cc b phn vi nhaugip ta quyt nh cch phn tch khi lng hp l, ng n.

b) Phn tch khi lng:L phn tch cc loi cng tc thnh tng khi lng tnh ton nhng cn ch phn tch khi lng phi ph hp vi quy cch

quy nh trong nh mc v n gi d ton. Cng mt loi cng tc nhng quy cch khc nhau th phi tch ring.

, -TC

c ng c x yGi tr dton

xy l


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- Hiu r tng b phn, quan h gia cc b phn (hnh khi, cu to). Phn tch khi lng gn tnh n gin, cc kin thc ton hcnh cc cng thc tnh chu vi, din tch ca hnh phng, cng thc tnh th tch ca cc khi. Cc hnh hoc khi phc tp, ta c th chia cchnh hoc khi thnh cc hnh hoc khi n gin tnh.

c) Tm kch thc tnh ton:Khi phn tch ra cc hnh hoc khi ta cn phi tm cc kch thc tnh ton. Kch thc c khi l kch thc ghi trn bn v cng c

khi khng phi l kch thc ghi trn bn v. Ta cn phi nm vng cu to ca b phn cn tnh, quy nh v kch thc xc nh cho chnhxc.

V d: tnh din tch trt ngoi ca tng m trong bn v ch ghi kch thc t tim tng v vy nu l tng 220 th kch thc cnphi tm l kch thc trn bn v cng thm vi b dy ca tng 220.

d) Tnh ton v trnh by kt qu:

Sau khi phn tch khi lng hp l v tm c kch thc ta tin hnh tnh ton v trnh by kt qu. Yu cu tnh ton phi ngin trnh by sao cho d kim tra. Cn ch cc im sau:

- Khi tnh phi trit li dng cch t tha s chung. Cc b phn ging nhau, rt tha s chung cho cc b phn c kch thc gingnhau gim bt s php tnh.

V d: n x ( D x R x C)n : s b phn ging nhauD : chiu diR : chiu rngC : chiu cao

II. CCH TNH TIN LNG CC LOI CNG TC XY LP:1. Cng tc t:

Bt c mt cng trnh no khi xy dng cng c cng vic lm t thng l: o mng (tng, ct) ng ng, mng rnh, p nn,ng, lp chn mng.1.1.n vtnh: Khi tnh tin lng cho cng tc t phn ra

+ o v p t cng trnh bng th cng (n v tnh l: cng /m3)

+ o, p t bng my (n v tnh l: 100 m3)

1.2. Quy cch: Cn phn bit+ Phng tin thi cng - th cng hay my+ Cp t: Ty theo mc kh thi cng hay d thi cng m phn t ra thnh 4 cp (I, II, III, IV theo bng phn cp t nh mc

d ton)+ Chiu rng, chiu su, h s dm nn (vi cng tc p t, ct)

A. o t:

* o t bng th cng- o t bn

- o t p- o mng cng trnh+ Mng bng+ Mng ct tr, h kim tra

- o knh mng, rnh thot nc- o nn ng- o khun ng, rnh thot nc, rnh xng c.....

* o t bng my- San sn bi -san i - o lng h (bng t hp my o - t - my i hay my i, my cp c lp)- o xc t p hoc i- o mng cng trnh- o knh mng- o nn ng mi - nn ng mrng- o t trong khung vy phng nc, cc tr trn cn- Xi ht bn trong khung vy phng nc.....

B. p t:

* p t cng trnh bng th cng- p nn mng cng trnh- p bknh mng p- p nn ng- p ct cng trnh

* p t cng trnh bng my- p t mt bng cng trinhf

- San m t mt bng- p p knh mng- p nn ng- p ct cng trnh

- p cng trnh1.3. Phng php tnh:

Khi tnh tin lng cng tc o, p t thng gp cc trng hp sau:a)o (hoc p) t c thnh th ngng:


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Trng hp ny thng gp ni o mng khng su, t tt thnh t st l, hoc thnh c chng st lbng vch ng. p nnnh sau khi xy tng mng.

Cc trng hp ny tnh theo hnh khi ch nht* Ch mt siu sau:- Knh thc ho c xc nh da vo kch thc mt bng v mt ct chi tit mng.V d:

Vo t = Sy x h (m3)

b)o (hoc p) t c thnh vt taluy:

Trng hp o t ti ni t xu, t d st l, o xong lu cha thi cng, ho c su ln. gii quyt chng st lchovch ho ng ta c th dng phng php o thnh t vt taluy. Trng hp p t cng vy trnh st lngi ta cng c thpt c thnh vt taluy. vt khi o (hoc p) tu theo tnh cht ca t, nhm t.

tnh tin lng t o (hoc p) ta c th p dng cng thc 3 mc cao sau y:

V = (S1 + S2 + 4S3)

Trong :S1 v S2: l din tch trn v y di (S1 // S2)

S3: l din tch tit din cch u S1 v S2.

h: khong cch gia 2 y.

- Nu trng hp: hai y l hnh ch nht c cnh l a1, b1 v a2, b2 th cng thc trn c th vit:

S1 = a1b1

S2 = a2b2

4S3 = x 4 = (a1 + a2)(b1 + b2)

Vy: V = [a1b1 + a2b2 + (a1 + a2)(b1 + b2)]

Cc khi c 2 y l hnh ch nht song song nhau u c th p dng cng thc trn.c. Tnh tin lngo t ca h thng mng(cho c trng hp o ng thnh v vt taluy) u c th p dng cc phng php tnh

nh sau:- Tnh theo chu vi tim hay kch thc tim (nu cc mng ca h thng to thnh chu vi c cc kch thc mt ct ging nhau).

Chiu di ton b mng: (LA + LB) x 2

- Tnh tin cc khi lng khi gp mng gp khc

d. Tnh tin lngt lp mng:

- Tnh chnh xc:

Vlp = Vo - Vc-trnh

Trong :

Vlp

: khi lng t lp mng

Vo: khi lng t o

Vc-trnh: bng khi lng b tng lt mng + khi lng xy (hoc b tng)

- Tnh gn ng:

S = (b x l)

a1b1

a2

2b

6

h

222121 bbx

aa ++

6

h

LA

L2

L1

L'1 L'2

l = l' l = l'


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Theo kinh nghim ta c th tnh gn ng bng:

Vlp = Vo

2. Cng tc ng cc:Trong cc cng trnh xy dng i vi nhng ni nn t yu lm tng kh nng chu lc ca nn v mng ngi ta c th gia c nn

v mng bng phng php ng cc. Cc cng trnh xy dng thng thng thng dng cc loi:

- Cc tre ti c ng knh 80- Cc g.

- Cc b tng ct thp.2.1n vtnh: Tnh theo m di cc (100m)2.2 Quy cch: Cn phn bit:+ Trng hp ng cc bng th cng

- Loi cc, mt cc (s cc ng tnh trn 1 m2)

- Kch thc cc (chiu di, ng knh, tit din)

a. Cc tre, g: chiu di cc ngp t 2,5 m; > 2,5 m

b. Cg: chiu di ngp t 4 m, > 4 m- Cp t- Bin php thi cng (ng cc th cng, ng bng my...)

+ Trng hp ng cc bng my:- Loi cc (cc g, c g, c b tng ct thp, cc ng b tng ct thp, cc vn thp, cc ng thp, cc thp hnh ...)- ng cc trn mt t hay trn mt nc.- Cch ng: c cc dn hay khng c cc dn.- Chiu di cc ngp t hay khng ngp t.- Phng tin: ng bng my, tu ng cc, trng lng ca ba.

2.3 Phng php tnh:Da vo bn v thit k ghi r kch thc khu vc cn ng cc gia c, kch thc cc, mt cc, loi cc ta s tnh c chiu di

cc.

chiu di = din tch gia c x chiu di cc x mt cc

V d: Hy tnh tin lng cc cn gia c nn mng cho 1 cng trnh vi din tch l 40 m2t cp II bng cc tre ti, ng knh

80mm, chiu di cc 2m, bng phng php th cng, c mt 25 cc/m2, chiu di cc ngp t 2,5m.

Bi gii:

tnh bi ny ta cn phi phn bit:a. n v tnh: - Tng chiu di bng m.

b. Quy cch: - Cc tre ti, 80, mt 25 cc/m2

.

- Chiu di cc 2 m ng ngp t 2,5m- t cp II.

c. Phng php thi cng: ng cc bng th cng.Vy tng chiu di cc:

chiu di = din tch gia c x 1 cc x mt

= 40m2 x 2m x 25 cc/m2 = 2.000m

3. Cng tc thp:Trong xy dng thp c dng cc dng:- Kt cu thp: Ct, dn, v ko, dm thp ... nhng kt cu ny thng dng thp hnh (U, I, T, L, Z), thp bn, cng c khi dng thp

trn.- Ct thp trong kt cu b tng ct thp: thng dng thp trn (c gai hoc khng c gai (g)).3.1n vtnh: Trong cng tc thp n vc tnh l: tn.

3.2 Quy cch: Cn phn bit theo cc im sau:- Loi thp: CT1; CT2 ...

AI; AII ... CI; CII; CIII; CIV

- Kch thc: i vi thp hnh (hoc k hiu thp)

- ng knh thp (i vi thp trn 10; 18, > 18- Loi cu kin (ct, mng, dm, x, ging, lanh t, cu thang...)

- V tr cu kin: (cao > 4m; cao 4m)- Phng php thi cng3.3. Phng php tnh ton:a. Tnh tin lng thp cho kt cu thp:

- Tnh ra chiu di ca tng loi thanh thp hnh.- Tnh ra din tch ca tng tm thp bn ca cu kin.

Dng bng trng lng n v c sn (trong s tay tnh ton kt cu thp) tnh ra trng lng ca tng loi ri tnh c trng lngtng cng.b. Tnh thp trong kt cu b tng ct thp

Tnh tin lng ct thp trong kt cu b tng ct thp ta thng bc khi lng c tnh sn trong bng thng k ct thp bn vthit k (phn bn v kt cu).

3

1


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- Trng lng n v ca tng loi ng knh c trong phn kt cu b tng ct thp.- Bng thng k ct thp thng c mu nh sau:

Ch : Phn cng chung, cng cc thp c cng ng knh ca cc cu kin c cng quy cch trong cng trnh. Chng hn ta cngchung khi lng tng loi ng knh ca cc nhm cu kin nh:

Trong h sthit k vic tnh ton, b tr thp v lp bng thng k ct thp l cng vic ca ngi thit k nhng trong mt s trnghp ta cng c th cn phi kim tra li v lp bng thng k thp trn cs tnh khi lng thp. lm vic ny phi xem bn v chitit cu to. tnh chiu di ca thanh thp phi tnh ra chiu di tng on chi tit v cng li. Mt s chi tit cu to thp.

Khi thanh thp un xin i to thnh gc

Nu = 45o th on xin bng 1,414 h1

Nu = 60o th on xin bng 1,155 h1

Trong :

h1 = h - 2a

h: chiu cao ca dma: khong cch t mp ngoi ca dm n trng tm ct thpd: ng knh ca thanh thp

Trng hp trong bn v khng ghi r lp bo v th p dng quy phm v lp bo v ct thp nh sau:

+ Sn, tng dy 100 aB

= 10 mm

+ Sn, tng dy > 100 aB = 15 mm

+ Ct, dm c ng knh thp 20 ab = 20 mm

> 20 ab = 25 mm

> 30 ab = 30 mm

4. Cng tc b tng:Trong cng trnh xy dng b tng v b tng ct thp l nhng khi lng ph bin thng gp hu ht cc b phn ca cng trnh

nh: b tng lt mng, b tng: mng, ct, dm, sn, lanh t, vng, ging mng, ging tng, b tng nn, b my v.v... L nhng khi lngc thc lp hoc nm xen k trong cc khi lng ca cc cng tc khc.

4.1n vtnh:

n v tnh cho cng tc b tng v b tng ct thp l m3.

4.2 Quy cch:

Trong cng tc b tng v b tng ct thp quy cch cn c phn bit bi nhng im sau y:- Loi b tng: b tng gch v, dam, si, c ct thp hay khng- S hiu b tng (mc b tng)- Loi kt cu (mng, ct, dm, ging, sn, cu thang...)

- V tr kt cu: cao 4m; cao > 4m- Phng thc thi cng: ti ch (va sn xut bng my trn bng th cng...) c sn.4.3 Phng php tnh:Trong cng trnh xy dng cc khi b tng c th nm xen k trong cc khi lng cng tc khc v vy khi tnh ton cn nghin cu k

bn v tnh ring cc khi lng c quy cch khc nhau. Ta c th phn thnh tng khi tnh theo phng php tnh th tch ca cc hnhkhi hnh hc m ta bit cch tnh.

Trng hp khi lng b tng ca mt b phn nm trong tng xy ta c th tnh tch b phn thnh hai khi: phn b tng trongtng, phn ngoi tng. Khi tnh khi lng xy tng ta phi tri khi lng b tng chim ch trong tng.

- Cc b phn c lin quan vi nhau v kch thc khi tnh ton ta cn nh du s dng li cho cc phn tnh sau, v d:+ Din tch o mng = din tch b tng lt mng

+ Din tch p nn = din tch lt nn+ Chiu di ging tng = chiu di tng...- Tnh khi lng b tng thng khng phi tr khi lng ct thp nm trong b tng.- Khi tnh khi lng ca cc cu kin c sn in hnh (panen, tm an...) ta ch vic tnh ra s cu kin ri tnh ra khi lng ton b

Tncukin

Tnthp

Hnhdng v

kchthc

mm

1 c u kin Ton b Cng chung

Sthanh

Chiudi(m)

Sthanh

chiudi(m)

mm

Chiudi

(mm)

Trnglng

- Mng - Ct - Dm, ging - Sn - Cu thang- Lanh t - vng - Sn ...


8/28

bng cch nhn s cu kin vi khi lng mt cu kin bit sn.V d: Panen hp

= 0,16 m3/ci (kch thc d = 3300; r = 600; h = 200)

= 0,146 m3/ci (kch thc d = 3000; r = 600; h = 200)

5. Cng tc n:Nhng cng vic thuc v nn trong mt cng trnh xy dng thng l: xy, trt, lng, lt, p, lp mi, xy bchy.5.1 Cng tc xy:

a.n v tnh: Cng tc xy tnh theo m3b. Quy cch: cn phn bit theo cc yu t sau:- B phn xy (mng, tng, trc lp ...)

- V tr ca b phn (tng 1 hay tng 2 cao 4m hay > 4m)- Vt liu xy (, gch v.v...)- Loi va (va xi mng hay va tam hp) mc va (25, 50, 75...)c. Phng php tnh:

Khi tnh tng nm thnh h thng cn ch :- p dng cch t tha s chung cho chiu cao v chiu dy tng.- Ly ton b chiu di ca tng (theo chiu di ging tng tnh phn b tng) nhn vi chiu cao ta c din tch tng ton b.- Ly din tch ton b tri din tch ca v din tch trng c din tch mt tng- Ly din tch mt tng nhn vi b dy tng c khi lng ton b.- Tri khi lng cc kt cu khc nm trong tng ta c khi lng tng xy cn tnh.5.2 Cng tc trt, lng:

L cng vic thuc v cng tc hon thin

a.n v: Tnh tin lng cho cng tc trt lng theo m2 mt trt, lng (nu trt g, pho, ch, hm ca. Tnh theo m di).

b. Quy cch: Cn phi phn bit theo cc yu t sau:- Cu kin c trt, lng, v tr (trt tng, trn, tr, g, pho my c, lng nn, sn, vng, b nc... c nh mu, khng nh mu,

cao 4m hay cao > 4m.- Loi va, s hiu va- Chiu dy lp trt, lng- Bin php trt- Yu cu k thutc. Phng php tnh:

- Tnh theo din tch mt cu kin b phn c trt, lng.- Cc cu kin c nhiu mt cn phn bit: mt trt, mt lng (bc thang, vng...)

- Khi tnh trt, lng cho ton b cng trnh ch tch ring cc b phn, cc khu vc trt va khc, b dy lp trt khc nhau.- Tnh din tch mt tng ton b ri tr din tch ca, trng v din tch trt va khc quy cch hoc din tch p.5.3 Cng tc lt, p:

a.n v: Tnh theo m2 mt cn lt, p

b. Quy cch: Cn phn bit theo cc yu t sau:

- B phn cn lt, p v tr cc b phn (cao 4m, > 4m)- Vt liu lt p (, gch loi g, kch thc...)- Loi va, s hiu va, b dy ...)c. Phng php tnh: Tnh theo din tch mt c p, lt* Ch : Din tch lt nn = din tch trt trn + din tch qua ca i5.4 Cng tc lp mi:

a.n v: Lp mi tnh theo m2 mi

b. Quy cch: Cn phn bit:- Vt liu lp (ngi, tn, phibr xi mng ...)

- Loi ngi lp: 22 v/m2; 13 v/m2; 75v/m2

- Tng nh (chiu cao) phng tin thi cng.c. Phng php tnh: Cn c vo gc nghing ca mi ta tnh c din tch mi cn lp

6. Cng tc mc:Trong xy dng dn dng thng thng cc cng tc thuc v mc gm c: lm ca, lm trn, vn khun, p trang tr.6.1 Cng tc lm ca:- Ch tnh khi lng ca i mua ch khng tnh nhn cng. Ch tnh cng lp ca.

a.n v tnh: m2 - cho cnh ca; m - di cho khun ca

b. Quy cch: cn phn bit- Loi cnh ca: ca i, d, lt, knh, n, kp, g, st, c khun, khng khun, khun n, khun khp.- Loi g: lim, hng sc, ch ch, di, de...

- iu kin k thut: mng, , cu to mt ca, hunh, trm...c. Phng php tnh:

Da theo kch thc mt bng v mt ct (hay bng thng k ca trong h sthit k) ta tnh c khi lng ca tng loi theo quy cchca chng. Chi ph cho cng tc sn xut ca cc loi tnh theo bng gi thng bo hng thng (hoc hng qu) ca lin sXy dng- Ti

HP33.6.2

HP30.6.2


9/28

chnh - Vt gi a phng tnh, k c ph tng m khng tnh cng sn xut.- Ch tnh cng tc lp dng ca, khun ca.6.2 Cng tc lm trn, sn xut v ko lm mi:* Cng tc lm trn:

a. n v tnh: m2

b. Quy cch: cn phn bit- Trn vi rm, trn m g;- Trn giy p cng, trn vn p, trn phibr xi mng;

- Trn ct p, trn g dn;- Trn g dn c cch m, cch nhit;- Trn vn p bc simili, mt dy 5cm np phn bng g;- Trn vn p chia nh c giong chm hoc np ni trang tr;- Trn bng tm thch cao hoa vn 50x50cm, 63x41cm;- Trn bng tm nha hoa vn 50x50cm;- Trn lambri g.

c. Cch tnh: Da vo bn v thit k din tch trn cn lm v loi trn tnh ra vt liu.* Sn xut v ko lm mi:

a. n v tnh: m3

b. Quy cch: Cn phn bit- V ko mi ngi- V ko phibr xi mng- V ko hn hp g mi ngi- V ko hn hp g, st trn mi phibr xi mng...

c. Phng php tnh:- i vi x g v cu phong: Tnh ra khi lng 1 thanh (chiu di x tit din thanh) sau nhn vi tng s thanh cn tnh.- i vi nh dn dng: Thng dng v ko in hnh do B Xy dng ban hnh KGNT - 01; KGN-02; KGF-03 trong mi loi v ko

u c ghi c th v ph kin v th tnh g cn lm cho mt v ko. Nh vy ta ch vic ly s liu a vo tin lng.- Trng hp khng phi v ko thit kin hnh th phi xem kch thc tng thanh theo bn v (hoc theo bng thng k ca v ko)

v tng cng khi lng g cc thanh li ta c khi lng ca v ko.6.3 Cng tc vn khun:

a.n v tnh: m2(100m2)

b. Quy cch: Cn phn bit

c. Phng php tnh:

- Khi lng vn khun b tng( i vi b tng ti ch hay c sn) c tnh theo din tch b mt b tng cn s dng vn khun.- i vi cc kt cu, cu kin b tng c ch rng vi din tch ch rng

1m2 th khng tr khi lng din tch vn khun v cng khng c tnh thm khi lng vn khun cho b mt thnh, gxung quanh chrng.

7. Cng tc qut vi, sn, b ma tt...7.1 Cng tc qut vi:

a.n v tnh: m2b. Quy cch: cn phn bit:

- Phng php thi cng: qut, phun;- Qut vi trng hay mu, my nc;- B phn cn qut;- Tng nh (chiu cao)

c. Phng php tnh: khi lng cng tc qut vi thng cn cvo din tch trt.

7.2 Cng tc sn:

a.n v: Tnh theo m2

b. Quy cch: Cn phn bit- B phn c sn;- Vt liu ca vt cn sn: g, thp, knh, tng...- S nc cn sn;

- Qut hay phun.c. Phng php tnh: Tnh theo din tch b mt ton b ca vt sn.7.3. Cng tc b ma tt:

a.n v tnh: m2

+ Vn khun cho b tng ti ch - Vn khun- Loi kt cu

- Vn khun kim loi- Loi kt cu

+ Vn khun cho b tng lp ghp - Vn khun g- Loi cu kin- Vn khun kim loi- Loi cu kin


10/28

b. Quy cch tnh: cn phn bit:- Kt cu cn b: tng, ct, dm, trn- Vt liu b: hn hp, hay bt b ch to sn

8. Cng tc lp t in, cp thot nc trong nh v phc v sinh hot:8.1 Cng tc lp tin:+ Cn phn bit theo tng loi:

- Lp t cc loi n, qut in.- Lp t ng bo v cp, dy dn v ph kin ng dy.

- Lp t cc ph kin ng ngt o lng, bo v.- Lp t h thng chng st

8.2 Cng tc cp thot nc trong nh:+ Cn phn bit

- Lp t cc sn phm v ph kin phc v sinh hot v v sinh- Lp t h thng cp thot nc trong nh

Phng php tnh: tnh c tin lng ca nhng cng vic ny phi da vo cc bn v tng ng trong h sthit k, cc ch dnk thut, cc loi thng k v quy cch, chng loi, s lng vt liu ph hp vi n v s dng trong MDT xy dng.

9. Cng tc lm sn, ng:+ Cn phn bit:9.1 Cng tc lm ng bPhn theo tng loi ng b (ng cp phi, ng nha v.v...)9.2 Cng tc lm mtng st

9.3 Cng tc lm sn: (sn btng, sn lt gch, sn b tng gch vlng va c hay khng nh mu v.v...)Phng php tnh: T nhng bn v tng ng, cc ch dn k thut v cc bng thng k trong h sthit k ta s tnh ra tin lng xy

lp c n v ph hp vi tng loi cng vic.

III. TNH TIN LNG MT CNG TRNH XY DNG:Tnh tin lng ton b mt cng trnh xy dng l mt cng vic phc tp v n tng hp nhiu loi cng tc, cc quy cch, hnh khi a

dng, khi lng tnh ton nhiu. V vy mun tnh c y trnh nhm ln sai st (tnh trng lp tha, hoc b st). Rt gim c thigian v khi lng tnh ton cn phi ch mt sim sau y:

1. Cc bc tin hnh tnh tin lng:Cn nghin cu bn v t ton thn b phn chi tit nm chc cu to cc b phn ca cng trnh. S lin quan gia cc b phn vi

nhau xc nh c cc khi lng cn tnh ton cho mi cng tc ca cng trnh. Sau ta thc hin tnh tin lng cho mi cng tc nh hc.

2. Trnh ttnh ton tin lng xy lp cc cng tc: trnh b st khi tnh tin lng ta nn tin hnh lit k cc cng vic phi tnh trong mi phn cng trnh nh sau: (nh 1 dn bi)

A. Phn mng

B. Phn h rnh

C. Phn thn nh

D. Phn mi1. Lm mi bng:

- Kiu dng- Xy tng mi- Trt, p, qut vi- Chng nng ngoi quy cch nu trong cc kiu mi (nu c)

2. Lm mi dc- G mi: v ko - x g, cu phong- Lp mi, xy b- Sn, qut vi

Ty tng cng trnh c th m mt vi cng tc c th vng mt trong tng phn ca cng trnh. Trc khi tnh ta cn lit k y tngcng vic v sp xp theo trnh t nh trn.

Nu lp d ton thi cng th ta nn tnh theo trnh t thi cng, to iu kin d dng cho vic nht khi lng lp k hoch thi cng,giao khon khi lng.

1. Cng tc t: (o, p t mng nn) 4. Cng tc vn khun mng2. Cng tc b tng: lt mng, mng 5. Cng tc xy3. Cng tc ct thp 6. Cng tc trt lng phn c mng

ngoi nh7. Cng tc qut vi 8. Lp mng, san nn...

1. Cng tc t 4. Cng tc trt, lng2. Cng tc b tng 5. Cng tc qut vi, sn trang tr bn hoa, tam cp3. Cng tc xy 6. Vn chuyn t i xa (nu c)

1. Cng tc b tng (c sn, ti ch) 5. Cng tc ca, then kho

2. Cng tc st thp 6. Cng tc qut vi, sn3. Cng tc xy 7. Lng, lt, dn, p trang tr ... (nu c)4. Cng tc trt, lng, lt, p 8. Cng tc lp ghp sn


11/28

3. Tnh ton v trnh by kt qu vo bng tin lng:Sau khi lit k y cc loi cng tc ca tng phn cng trnh ta tin hnh tnh tin lng cho tng cng tc nh nu mc II

nhng ch l din gii cch thc hin phng php tnh. Cn trong h sd ton thit k ta phi th hin cch tnh v ghi kt qu vobng tin lng theo mu sau.

+ Ch khi ghi bng tin lng:- V quy cch: cn ghi y , chnh xc quy cch ca tng loi cng tc, khng hn ch s dng ng vi mt quy cch ca mt khi

lng cng tc ta ghi mt s th t, ng vi mt s th t ta c mt kt qu ghi ct ton phn (mi kt qu trong qu trnh tnh m cha phil khi lng cn tm th khng c ghi ct ton phn).

-Phn din gii cch phn tch khi lng tnh ton cn ghi r d kim tra theo di.- Cc kch thc ghi trong bng tin lng l kch thc thc c tnh ton nhng khng cn trnh by cch tnh cc kch thc

trong bng.Mu bng tin lng

CHNG III

DTON NHU CU VT LIU, NHN CNG,XE MY THI CNG

I. VAI TR CA VIC XC NH DTON NHU CU VT LIU, NHN CNG, XE MY THI CNG:1. Tc dng ca cng tc dton nhu cu vt liu, nhn cng xe my thi cng:- D ton vt liu, nhn cng, my thi cng l csn v xy lp lp k hoch cung ng vt t k thut, k hoch t chc thi cng

iu ng nhn lc v xe my thi cng. Trong d ton nhu cu ca cc vt liu xy dng cn lm cn c tnh b tr chnh lch chi phvt liu khi lp d ton xy lp cng trnh, hng mc cng trnh.

- D ton nhu cu vt liu, nhn cng my thi cng l cs lp k hoch u t xy dng cbn ca ngnh, ca chu t.2. Cs lp dton vt liu, nhn cng v xe my thi cng:

- Khi lng cng tc ca cng trnh (tin lng)- nh mc d ton xy dng cbn

II. KHI LNG CNG TC XY LP (TIN LNG):Ni dung ca phn ny c trnh by Chng 2 ca gio trnh ny.

III. NH MC DTON XY DNG CBN:

1. Khi nim:nh mc d ton xy dng cbn (gi tt l nh mc d ton) do B Xy dng ch tr cng vi cc B chuyn ngnh nghin cu xy

dng v ban hnh p dng thng nht trong c nc. N l nh mc kinh t k thut xc nh mc hao ph cn thit v vt liu, lao ng v

my thi cng hon thnh mt n v khi lng cng tc xy lp tng i hon chnh nh 1m3 tng gch xy, 1 m3 b tng, 1 m2 lt

gch, 1m2 mi nh ... t khu chuyn bn khu kt thc cng tc xy lp (k c nhng hao ph cn thit do yu cu k thut v t chc snxut nhm m bo thi cng xy lp lin tc, ng quy trnh quy phm k thut).

2. Ni dung nh mc dton xy dng cbn:nh mc d ton xy dng cbn gm 3 mc hao ph:a. Mc hao ph vt liu:

L s lng vt liu chnh, vt liu ph, cc cu kin hoc cc b phn ri l, vt liu lun chuyn cn thit cho vic thc hin v honthnh khi lng cng tc xy lp.

- Mc hao ph vt liu chnh c quy nh bng s lng theo n v thng nht cho tng chng loi trn phm vi c nc.- Mc hao ph vt liu ph khc c quy nh tnh bng t l phn trm (%) trn chi ph vt liu chnh.

b. Mc hao ph lao ng:L s ngy cng lao ng ca cng nhn (chuyn nghip v khng chuyn nghip) trc tip thc hin mt n v khi lng cng tc xy

lp t khu chun bn khu kt thc trong k c thv ph (k c cng nhn vn chuyn, bc dvt liu, bn thnh phm trong phmvi mt bng xy lp)

- Mc hao ph lao ng c quy nh tnh bng s ngy cng theo cp bc ca cng nhn trc tip xy lp bnh qun bao gm c lao

TTTn cng vic v

quy cch

S bphngingnhau

Kch thc Khi lng

D R Cnv

Sph

Tngphn

Tonphn

A- Phn mng1 o mng...2 t p ...3 BT gch vlt mng

B- Phn thn4 Tng 1

5 Tng 2................C- Phn mi........;.........................


12/28

ng chnh, ph k c cng tc chun b, kt thc, thu dn hin trng thi cng.c. Mc hao ph my thi cng:

L s ca s dng my thi cng trc tip phc v xy lp cng trnh chuyn ng bng ng chi nc, iezen, xng, in, kh nn... (kc mt s my phc v xy lp c hot ng c lp ti hin trng nhng gn lin vi dy chuyn sn xut thi cng xy lp cng trnh).

- Mc hao ph my thi cng chnh c tnh bng s lng ca my s dng.- Mc hao ph my thi cng ph khc c tnh bng t l % trn chi ph s dng my chnh.

3. Quy nh p dng:- nh mc d ton c p dng lp n gi xy dng cbn, lm cs lp d ton xy lp cng trnh xy dng cbn thuc cc

d n u t xy dng.Trng hp nhng loi cng tc xy lp m yu cu kthut v iu kin thi cng khc vi quy nh trong nh mc d ton hoc chac trong danh mc nh mc d ton hin hnh (nh mc d ton xy dng c bn km theo Quyt nh 1242/1998 Q-BXD ngy25/11/1998 ca B Xy dng ban hnh, p dng thng nht trong c nc c hiu lc t 01/01/1999) th chu t, t chc t vn thit k vcc n v nhn thu xy dng cn c vo ti liu thit k, cc nh mc n gi tng t, hoc cn c vo iu kin c th v h thng nhmc sn xut (nh mc thi cng) lp nh mc n gi thch hp phc v cho vic lp d ton xy lp cng trnh, trnh cc cquan cthm quyn ban hnh p dng.

IV. TNH TON NHU CU VT LIU, NHN CNG, XE MY THI CNG:1. Xc nh nhu cu vt liu, nhn cng, my thi cng cho tng khi lng cng tc xy dng:

- Nhu cu vt liu, cng nhn, xe my thi cng giai on thit k k thut. Xc nh theo ti liu thit k k thut v nh mc d tontng hp.

- Nhu cu vt liu, nhn cng, my thi cng giai on thit k bn v thi cng xc nh theo ti liu thit k bn v thi cng v nh mcd ton chi tit.

+ Yu cu khi xc nh tng loi nhu cu:

- i vi vt liu cn xc nh r s lng, n v, chng loi, quy cch;- i vi nhn cng: cn xc nh r s lng cng cho tng loi th, cp bc th,- i vi my thi cng cn xc nh r s lng ca cho tng loi my, ghi r m hiu, cng sut ca my.

2. Cch tra cu bn nh mc dton:Sau khi ta tnh c khi lng cc loi cng tc ca cng trnh ta tin hnh tra cu nh mc d ton xc nh vt liu, nhn cng

v my thi cng.Khi tra cu nh mc d ton cho mt loi cng tc xy lp hoc mt kt cu c th ta tra theo danh mc tng chng (MDT c 18

chng). Trong mi chng li gm 1 s tit nh mc. Trong mi tit nh mc u c 2 phn:- Thnh phn cng vic;- Bng nh mc v cc khon mc hao ph.+ Thnh phn cng vic quy nh r y iu kin k thut, iu kin thi cng, bin php thi cng, cc bc cng vic theo th t t

khu chun bn khu kt thc hon thnh. Xc nh n v tnh ph hp thc hin cng tc xy lp .+ Bng nh mc m t tn, chng loi, quy cch vt liu chnh cn thit v cc vt liu ph khc, loi th, cp bc cng nhn bnh qun,

tn, loi, cng sut ca my mc thit b cho v mt s my thit b khc trong dy chuyn cng ngh thi cng thc hin hon chnhcng tc, kt cu xy lp.

Cc mc nh mc c tp hp theo nhm, loi cng tc hoc kt cu xy lp v c t m thng nht trong Ngnh Xy dng. Mimc nh mc l mt t hp gm nhiu danh mc cng tc c th, mi danh mc u c mt m hiu ring cho n, th hin mt cch c thtn gi, yu cu k thut, iu kin thi cng c th, bin php thi cng ph bin.

Sau khi ta xc nh c s hiu nh mc d ton ta tin hnh tra tng thnh phn hao ph.- Vt liu: gm nhng loi no, n v tnh v mc tiu hao tng loi vt liu cho n v khi lng cng tc hoc kt cu xy lp.- Nhn cng: Xc nh c loi th, cp bc thbnh qun v mc tiu hao lao ng theo ngy cng.- My thi cng: Xc nh tn, loi, cng sut ca my chnh v mt s my, thit b khc trong dy chuyn thi cng, mc tiu hao thi

gian ca my tnh theo ca my.V d: cng tc xy gch (Chng V)- Mc xy (trang 162 - NDT):M ho GA.0000 Xy hc

GA.1000 Xy mngM hiu nh mc GA.11 m ho cng vic xy mng

n v tnh 1 m3 xy

Thnh phn hao ph: ng vi quy cch chiu dy mng 60 cm v > 60 cm

- Mc xy gch (trang 167 - 168 MDT):M ho GD.0000 Xy gch ch (6,5 x 10,5 x 22)

GD.2000 Xy tng thngM hiu nh mc GD 2 m ho cng vic xy tng thng

n v tnh 1 m3 xy

Thnh phn hao ph, ng vi quy cch chiu dy tng xy 11cm 33cm > 33cm v chiu cao tng xy 4m; > 4m+ Vt liu:

- hc n v tnh : m3

- dm n v tnh : m3

- Va n v tnh : m3

- Nhn cng 3, 5/7 n v tnh : cng

- Gch n v tnh : vin - Va n v tnh : m3


13/28

+ My thi cng

3. Tng hp nhu cu vt liu, nhn cng, my thi cng cho ton cng trnh:Sau khi tnh ton c nhu cu vt liu, nhn cng, xe my thi cng cho tng khi lng cng tc ca ton cng trnh. tng hp nhucu vt liu, nhn cng, my thi cng th qu trnh tnh nhu cu cho tng loi cng tc ta trnh by kt qu tnh ton vo "Bng phn tch vtliu, nhn cng, my thi cng" theo Bng 1, ri cng cc ct ta c bng tng hp cc nhu cu v vt liu, nhn cng, my thi cng.

Bng 1. Bng phn tch vt liu, nhn cng, my thi cng

Ghi ch:

- Cn ghi r s hiu nh mc s dng.- Ct loi cng tc xy lp, ghi r quy cch cng tc - Cc ct vt liu s dng, nhn cng, my thi cng s dng khng hn ch ct, tu theo tnh cht ca loi cng tc xy lp ca cng trnh

m s ct c th nhiu hay t. cho bng phn tch trn c gn ta nn nhm cc cng vic c s dng cc loi vt liu, nhn cng, mythi cng gn ging nhau (v d cng vic thuc v n, b tng, cng s dng xi mng, ct) ghi r n v ca cc loi vt liu, n v (cng) chonhn cng, n v (ca) cho xe my.

Sau ta tin hnh cng cc ct ca Bng 1 tng hp nhu cu v vt liu, nhn cng v xe my thi cng theo cc bng sau y (Bng2, Bng 3, Bng 4)

Bng 2. Bng tng hp nhu cu vt liu

Ngi lp

Bng 3. Bng tng hp nhu cu cng nhn

Ngi lp

Bng 4. Bng tng hp nhu cu my thi cng

Ngi lp

Bi tp v dS dng tp nh mc d ton tnh nhu cu vt liu, nhn cng, my thi cng cho cc khi lng cng tc ca cng trnh khi tnh c

phn tin lng.

V d 1: Tnh cng o t th cng, t cp II cho mt mng bng ca cng trnh vi khi lng l 81,5 m3, chiu rng mng o 3m, su 1m, o thnh thng ng.

Bi gii:Theo mc o t mng bng chng II ca nh mc d ton (trang 27) ta c s hiu nh mc l: (c th chn ghi theo 1 trong 2

cch: ; hay BA 1312). vi nh mc cho 1 m3t o t cp II l:

- Nhn cng 0,82 cng/m3 (cng nhn 2,7/7)

Vy s cng cn thit hon thnh khi lng t o l:

- Cy chng n v tnh : cy - G vn n v tnh : m3

- Dy buc n v tnh : kg+ Nhn cng 3,5/7 n v tnh : cng

- My trn 80l n v n v : ca- My vn thng 0,8T n v : ca

TT

Shiunhmc

Loicng tcxy lp

nv

Khilng

Vt liu s dng Nhn cng s dng(cng)

My thi cng (ca)

XM(kg)

Gchvin

Vi(kg) ...

L(cng)

N ... Tr n m ...

1Lit k

cc cngvic

2Cng

TT Tn chng loi, quy cch n v S lng Ghi ch

TT Loi th, bc th n v S lng Ghi ch

TT Loi my n v S lng Ghi ch

2

131BA

2

131BA


14/28

81,5 m3 x 0,82 cng/m3 = 66,83 cng

V d 2: Tnh nhu cu vt liu, nhn cng, my thi cng cho cng tc b tng gch vlt mng va TH ct mn (ML = 1,5 2,0) mc 25

dy 100 vi khi lng b tng l 25 m3.

Bi gii:

Theo mc cng tc b tng gch vcui Chng VI (cng tc b tng (trang 208 DMDT) ta c s m hiu nh mc vi nh

mc cho 1 m3 b tng gch v- Va 0,538 m3

- Gch v0,893 m3

- Nhn cng 3,0/7 : 1,17 cng

Tra ph lc vnh mc cp phi va ca cng tc xy dng (trang 179 MDT), ta c s hiu nh mc: l nh mc cho 1 m3

va tam hp ct mn.

Ct c m un ln ML

= 1,5 2,0

Ta c:

- Xi mng PC 30: 121,01 kg

- Vi cc: 71,07 kg

- Ct mn: 1,13 m3Vy s lng vt liu v nhn cng cn s dng l:+ V vt liu:

+ V nhn cng bc 3/7: 25 x 1,17 = 29,25 cng 29,2 cng

V d 3: Tnh nhu cu vt liu, nhn cng, my thi cng cn thit cho khi lng cng tc xy tng thng 220 gch chc mc 75 va THct mn (ML = 1,5 2,0) mc 25 tng mt.

C khi lng tng xy l 62 m3.

Bi gii:

Tra mc xy tng thng gch chChng V (cng tc xy gch ) (trang 168 MDT) ta c s hiu nh mc l nh mc cho

1 m3 xy tng.

+ Vt liu cn s dng l:

+ Nhn cng (3,5/7): 1,92 cng+ My thi cng:

- My trn 80l: 0,036 ca

Tra ph lc nh mc v va xy (trang 179 MDT)

S hiu nh mc l nh mc cho 1 m3 va tam hp ct mn ML

= 1,5 - 2,0 xi mng PC 30.

- Xi mng : 121,01 kg- Vi cc : 92,82 kg

- Ct mn : 1,13 m3

Vy:+ S lng vt liu cn s dng l:

+ Nhn cng s dng l:

10

11HE

2

112B

2

112B

- Gch v: 25 m3 x 0,893 = 22,33 m3 22,3 m3

- Xi mng PCB 30: 25 x 0,538 x 71,07 = 955,89 kg 0,96 tn- Ct mn: 5 x 0,538 x 1,13 = 15,20 m3

2102GD

- Gch ch: 550 vin.- Va: 0,29 m3

- Cy chng: 0,5 cy- G vn: 0,003 m3

- Dy buc: 0,23 kg

2

112B

- Gch ch: 62 x 550 vin = 34100 vin.- Xi mng PC 30: 62 x 0,29 x 121,01 = 2175,76 kg 2,2 tn- Vi cc: 62 x 0,29 x 92,82 = 1668,9 kg 1,7 tn- Ct mn: 62 x 0,29 x 1,13 = 20,32 m3 20,3 m3

- Cy chng: 62 x 0,5 = 31 cy- G vn: 62 x 0,003 = 0,19 m3 0,2

- Dy buc: 62 x 0,23 = 14,26 kg 14,3 kg


15/28

62 x 1,92 = 119,04 cng 119 cng+ My thi cng cn s dng:

- My trn va 80l 62 x 0,036 = 2,23 ca 2,2 caV d 4:

Tnh nhu cu vt liu, nhn cng, my thi cng cn thit cho khi lng cng tc b tng dm dm. c ln dmax = 20 mm va

c st 2 4 cm mc 200 va b tng sn xut bng my trn, b tng th cng, c khi lng l 3,2 m3

Bi gii:

Tra mc b tng x dm, ging nh Chng VI (cng tc b tng ti ch) (trang 187 MDT) ta c s hiu nh mc l nh

mc cho 1 m3 b tng.

+ Vt liu cn s dng l:

- Va : 1,025 m3

- Vt liu khc : 1,0%+ Nhn cng (3,5/7): 3,56 cng+ My thi cng:

Tra phn ph lc nh mc d ton cp phi vt liu va b tng thng thng xi mng P 30 (trang 229) MDT.

Ta c s hiu nh mc l nh mc cp phi vt liu cho 1 m3 b tng

Ta c:

Vy s lng vt liu nhn cng my cn s dng l:+ Vt liu

+ My thi cng:

1031HA

- My trn 250l: 0,095 ca- My m di 1,5 KW: 0,18 ca- My vn thng 0,8 T: 0,11 ca

3

212C

- Xi mng: 342 kg- Ct vng: 0,469 m3

- dm: 0,878 3

- Nc: 185 lt

- Xi mng PC 30: 3,2 x 1,025 x 342 = 1121,76 kg 1,12 tn

- Ct vng: 3,2 x 1,025 x 0,469 = 1,54 m3 1,5 m3

- dm: (1 x 2) 3,2 x 1,025 x 0,878 = 2,88 m3 2,9 m3

- Nc: 3,2 x 1,025 x 185 = 606,8 lt 607 l+ Nhn cng (3,5/7) 3,2 x 3,56 = 11,39 cng 11,4 cng

- My trn 250 l: 3,2 x 0,095 = 0,3 ca- My m di 1,5 KW: 3,2 x 1,18 = 0,58 ca 0,6 ca- My vn thng 0,8T: 3,2 x 0,11 = 0,35 ca


16/28

BNG PHN TCH VT LIU NHN CNG - MY THI CNG

TTS hiunhmc

Tn cngvic v quy

cch

nv

Khilng

Vt liu s d ng Nhn cng (cng) My thi cng (ca)

Gch1000(v)

Gchv(v)

XM(tn)

Vicc

(tn)

Cten

(m3)

Ctvng

(m3)

Gvn

(m3)

Cychng

(c)

Dy(kg)

1x2

(m3)

Nc(1)

Laong N

Btng

Mytrnva

Mytrnbtng

mdi

Vnthng

1 2131BA

o mngbng t

nhm 4ng thnhRng < 3m

Su


17/28

BNG TNG HP NHU CU VT LIU

Ngi lp

BNG TNG HP NHU CU NHN CNG

Ngi lp

BNG TNG HP NHU CU MY THI CNG

Ngi lp

CHNG IV

LP DTON CNG TRNH

I. CC CN C LP DTON CNG TRNH:1. n gi xy dng cbn:

1.1 Khi nim:n gia xy dng cbn l ch tiu kinh t k thut tng hp xc nh nhng chi ph trc tip (vt liu, nhn cng, my thi cng) hay

ton b chi ph x hi cn thit hon thnh mt n v khi lng cng tc hoc kt cu xy lp to nn cng trnh.

V d:n gi 1m3 xy tng gch ch 220 l bao gm ton b chi ph tnh bng tin ca:

- Vt liu: gch, vi, xi mng, ct

- Nhn cng: lng v ph cp lng ca cng nhn chnh, ph trc tip xy dng ln 1m3 tng xy .

- My thi cng: chi ph s dng my, my trn va my vn chuyn vt liuTrong xy dng, n gi xy dng cbn c dng xc nh d ton cng trnh xy dng, lm cn c lp k hoch v qun l vn

u t xy dng, c s dng nh gi v mt kinh t, ti chnh cc h sd thu. n gi xy dng cbn cn l cc ch tiu cc tchc t vn thit k, thi cng so snh la chn cc gii php thit k, phng php thi cng v t chc thi cng hp l qu trnh thit k xydng cng trnh.

1.2 Phn loin gi xy dng cbn:a. Phn loi theo mc tng hp v yu cu xc lp dton

Trong cc giai on thit kn gi xy dng cbn c phn thnh 2 loi ch yu:- n gi xy dng cbn tng hp- n gi xy dng cbn chi tit

+n gi xy dng cbn tng hp

n gi xy dng cbn tng hp l n gi trong bao gm nhng chi ph trc tip, chi ph chung, li v thu tnh trn mt n vkhi lng cng tc xy lp tng hp hoc mt kt cu xy lp hon ch nh v c xc nh trn csn gi xy dng cbn chi tit hocnh mc d ton tng hp.

n gi xy dng cbn tng hp c s dng lp tng d ton cng trnh xy dng theo thit k k thut giai on chun b xydng.

V d:

a. Ton b chi ph trc tip (gm vt liu, nhn cng, my thi cng v cc chi ph chung, li v thu hon thnh 1m2 xy dng, 1m2

TT Tn vt liu v quy cch n v S lng Ghi ch

1 Gch chc mc 75 vin 34.100

2 Gch vcu m3 22,33

3 Xi mng PC 30 kg 4253,414 Vi cc kg 1668,9

5 Ct mn (ct en) xy m3 35,52

6 Ct vng ( btng) m3 1,54

7 G vn nhm 7 dy 3 cm m3 0,19

8 Cy chng (10 x 10 cm) cy 319 Dy buc kg 14,26

10 dm 1 x 2 cm m3 2,88

11 Nc sch lt 606,8

TT Loi th n v S lng Ghi ch

1 Thlao ng cng 66,832 Thn cng 119,043 Thb tng cng 40,64

TT Tn vt liu v quy cch n v S lng Ghi ch

1 My trn va 80l ca 2,232 My trn b tng 250l ca 0,303 m di 1,5 KW ca 0,584 My vn thng 0,8T ca 0,35


18/28

sn) y l n gi tng hp y .

b. Ton b chi ph trc tip (gm vt liu, nhn cng, my thi cng hon thnh 1m2 xy dng, 1m2 sn) y l n gi tng hp chay .

b/ Phn loi theo phm vi sdng

Do phm vi s dng ca n gi xy dng cbn m theo cch phn loi ny th n li c chia thnh 3 loi:- n gi xy dng ca tnh, thnh ph- n gi xy dng cng trnh- n gi xy dng d thu

+ n gi xy dng cbn ca tnh, thnh ph (cn gi l n gi xy dng chi tit ca a phng)n gi ny do ch tch UBND tnh, thnh ph trc thuc trung ng ban hnh v hng dn s dng. N c dng lp d ton chi

tit cng trnh xy dng giai on thit k bn v thi cng hoc dng xc nh tng d ton cng trnh theo thit k k thut thi cng (ivi cng trnh thit k mt bc) giai on chun b xy dng. Lm cn c xc nh gi xt thu i vi tt c cc cng trnh ca trungng v a phng khng ph thuc vo cquan ch qun xy dng trn a phng .

+ n gi xy dng cng trnh (bao gm n gi tng hp v n gi chi tit)i vi cc cng trnh quan trng ca Nh nc hoc cng trnh c nhng c im k thut, iu kin thi cng phc tp hoc mt s

cng trnh c iu kin ring bit, c th lp n gi ring theo iu kin thi cng iu kin sn xut v cung ng vt liu xy dng. Cc chchnh sch quy nh ring i vi tng cng trnh. n gi ny do ban n gi cng trnh lp v c cquan c thm quyn xt duyt banhnh.

Ban n gi cng trnh gm:- Chu t hoc i din thay mt chu t lm trng ban.- T chc nhn thu xy lp chnh l ph ban.Cc u vin ca ban:

- Cc u t pht trin (nu cng trnh s dng vn u t nh nc) hoc ngn hng thng mi (nu cng trnh xy dng bng vnvay).- n v thit k, gim st k thut xy dng cng trnh.- i din sxy dng, sc xy dng chuyn ngnh (tu theo tnh cht ca d n u t xy dng).i vi cng trnh thuc nhm A, bo B Xy dng thng nht vi cc ngnh hoc i phng vic thnh lp ban n gi v xem xt, ph

duyt hoc tho thun ban hnh n gi . i vi cc cng trnh khc do cc b ngnh, tnh, thnh ph trc thuc Trung ng xt duytc s tho thun ca B xy dng.

+ n gi xy dng d thu:n gi xy dng d thu l n gi xy dng cbn c lp ring cho tng cng trnh. N cn c vo iu kin bin php thi cng c

th, cc nh mc kinh t, k thut bin php t chc thi cng ca tng nh thu v mc gi c trn th trng. n gi xy dng d thu donh thu tham du thu lp; Nu trng thu th n l csca gi hp ng giao nhn thu.

1.3 Cslp n gi xy dng cbn:n gi xy dng cbn c xc nh trn cs:- nh mc d ton xy dng cbn ban hnh theo Quyt nh s 1242/1998/Q-BXD ngy 25/11/1998 ca B Xy dng.

- Bng gi d ton ca my v thit b xy dng ban hnh theo Quyt nh s 1260/Q-BXD ngy 28/11/1998 ca B Xy dng.- Bng lng A6 km theo Nghnh s 05/CP ngy 26/01/1994 ca Chnh ph.- Bng thng bo gi vt liu n chn cng trnh theo mt bng ca lin Sxy dng - Ti chnh- Vt gi.1.4 Ni dung chi ph trongn gi xy dng cbn:a/ Vi n gi XDCB chi tit

Ni dung cc chi ph trong n gi xy dng cbn chi tit l bao gm ton b nhng chi ph trc tip c lin quan to nn cng trnh.Nhng chi ph ny bao gm:- Chi ph vt liu: l gi tr vt liu chnh, vt liu ph, cu kin, cc vt liu lun chuyn (vn khun, gio...) ph tng, bn thnh

phm cn thit hon thnh mt n v khi lng cng tc hoc kt cu xy lp. Chi ph ny bao gm c gi mua, chi ph vn chuyn,bc d, bo qun, hao ht v chi ph ti hin trng xy lp. Nhng khng bao gm gi tr cc loi vt liu c tnh vo chi ph chung.

- Chi ph nhn cng: l chi ph v lng chnh, cc khon ph cp c tnh cht lng v cc chi ph theo ch chnh sch i vi cngnhn trc tip xy dng hon thnh mt n v khi lng cng tc xy lp. Nhng khng bao gm tin lng, ph cp lng ca cngnhn iu khin v phc v my thi cng, cng nhn cc xng ph tr, cng nhn vn chuyn ngoi cng trng, cng nhn thu mua boqun v bc xp vt t.

- Chi ph my thi cng: l chi ph s dng ca my hot ng ti hin trng hon thnh mt n v khi lng cng tc xy lp. ctnh theo bng gi d ton ca my v thit b xy dng hin hnh (Quyt nh s 1260/1998/Q-BXD ngy 28/11/1998 ca B Xy dng).Trong chi ph bao gm cc chi ph khu hao cbn, khu hao sa cha ln, chi ph nhin liu, nng lng vt liu ph, ph tng thayth. Chi ph tin lng chnh, ph cp c tnh cht lng ca cng nhn iu khin, phc v my v chi ph khc ca my nh: chi ph vnchuyn ti cng trng, chi ph lm ng tm ln tm cho xe my.

b. Vi n gi tng hp

+ Trng hp n gi xy dng tng hp khng y th ni dung chi ph tnh nh trng hp n gi XDCB chi tit nhng c tnhcho mt n v khi lng cng tc xy lp tng hp.

+ i vi n gi xy dng cbn tng hp y th ngoi ni dung chi ph vt liu, nhn cng, s dng my cn phi tnh c chi phchung v li, thu theo quy nh.

2. Gi thnh theo mt n v din tch hay mt n v cng sut sdng:L ch tiu xc nh chi ph xy lp bnh qun hon thnh mt n v din tch hay mt n v cng sut s dng hoc mt n v kt

cu ca tng loi nh, hng mc cng trnh thng dng c xy dng theo thit kin hnh, hay theo thit k hp l kinh t. Gi c tnhton t gi tr d ton trc thu ca cc loi cng tc, kt cu xy lp trong phm vi ngi nh hay hng mc cng trnh (dn dng, cngnghip, giao thng, thu li...) khng bao gm cc chi ph khng cu thnh trc tip trong phm vi ngi nh hoc hng mc cng trnh nh cc

chi ph xy dng cc hng mc ng s, cp thot nc, in ngoi nh... v chi ph thit b ca ngi nh hay hng mc cng trnh. Cn cny lp tng d ton lm csghi k hoch vn u t.

3. nh mc cc chi ph, ph, l ph tnh theo t l:3.1 Chi ph chung:


19/28

a. Ni dung ca chi ph chung

Nh gii thiu Chng 1, chi ph chung trong gi thnh d ton chim mt t trng kh ln ch sau chi ph trc tip. y l loi chiph cn thit c lin quan n vic xy dng hon thnh cng trnh nhng khng trc tip tham gia vo qu trnh xy dng .

Bao gm:- Chi ph qun l hnh chnh: l ton b nhng khon chi ph cn thit nhm m bo cho vic t chc b my qun l v cho sn xut

xy dng hot ng gm lng, ph cp lng, cng tc ph, in nc, vn phng phm, bu chnh, in thoi...- Chi ph phc v cng nhn: l nhng khon chi ph phc v cho cng nhn trc tip xy lp m cha c tnh vo chi ph nhn cng

trong n gi nh: chi ph bo him x hi, nghm, thai sn, trch np ph cng on, chi ph phc v thi cng, bo h lao ng c gi tr lnkhng giao khon cho ngi lao ng c.

- Chi ph phc v thi cng: l nhng khon chi ph cn thit phc v cho qu trnh thi cng, ci tin k thut, tng cng cht lngsn phm, y nhanh tin thi cng ... chi ph di chuyn iu ng cng nhn ...

- Chi ph chung khc: l cc chi ph v nhng khon pht sinh c tnh cht phc v cho ton doanh nghip nh bi dng nghip v, hctp, hi hp, skt tng kt, lt bo, ho hon v.v...

b.nh mc chi ph chung:

Chi ph chung c tnh bng t l phn trm (%) so vi chi ph nhn cng cho tng loi cng trnh do B Xy dng ban hnh.3.2 Thu nhp chu thutnh trc v thugi trgia tng:- Thu nhp chu thu tnh trc: c s dng np thu thu nhp doanh nghip v mt s khon chi ph phi np, phi tr khc, phn

cn li c tnh vo cc qu theo quy ch qun l ti chnh v hch ton kinh doanh i vi doanh nghip. Thu nhp chu thu tnh trc ctnh bng t l phn trm (%) so vi chi ph trc tip v chi ph chung quy nh theo tng loi cng trnh do B Xy dng quy nh.

nh mc chi ph chung v thu nhp chu thu tnh trc hin hnh c p dng theo Thng t s 09/2000/TT-BXD ngy 17/7/2000 caB Xy dng v c th hin bng sau y:

nh mc chi ph chung v thu nhp chu thu tnh trcn v tnh: %

- Thu gi tr gia tng (gi tt l VAT) u ra:Thu sut thu gi tr gia tng u ra c tnh bng t l phn trm (%) i vi cng tc xy dng v lp t. Thu gi tr gia tng u ra

c s dng tr thu gi tr gia tng u vo m doanh nghip xy dng ng trc tr khi mua cc loi vt liu, vt t, nhin liu,nng lng... nhng cha c tnh vo chi ph vt liu, chi ph my thi cng v chi ph chung trong d ton xy lp trc thu v phn thugi tr gia tng m doanh nghip xy dng phi np.

3.3 Cc ph, l ph, cc bng gi:Bao gm:- Chi ph n b t ai hoa mu, di chuyn dn c v cc cng trnh trn mt bng xy dng, chi ph phc v cng tc ti nh c v

phc hi (i vi cc d n c yu cu ti nh c v phc hi). c xc nh theo quy nh ca Chnh ph, hng dn ca B Ti chnh vcc cquan c thm quyn.- Quy nh ca Chnh ph v hng dn ca cc cquan c thm quyn v mc tin thu t hoc tin chuyn quyn s dng t.- Hng dn ca B Ti chnh v mc l ph a chnh cc l ph khc, thu, ph bo him.- nh mc chi ph kho st, thit k, chi ph ban qun l d n, chi ph cng tc t vn, cc chi ph v l ph thm nh (bo co nghin

cu kh thi, thit k k thut, hoc thit k k thut- thi cng, tng d ton, d ton cng trnh...) theo hng dn ca B Xy dng - B tichnh v cc cquan c thm quyn.

- Cc ch, chnh sch khc c lin quan do B Xy dng v cc cquan c thm quyn ban hnh.4. Cc ti liu:

c cn c lp d ton xy dng cbn cng trnh cn phi cn c vo mt s ti liu sau:- Bo co nghin cu tin kh thi (nu c), bo co nghin cu kh thi hoc bo co u tc cp c thm quyn ph duyt.- H sthit k k thut, thit k bn v thi cng hoc thit k k thut thi cng.- Khi lng cng tc xy lp tnh theo thit k ph hp vi danh mc nh mc, n gi xy dng cbn.- Danh mc v s lng cc thit b cng ngh (bao gm c thit b phi tiu chun cn sn xut gia cng (nu c), cc trang thit b khc

phc v sn xut, lm vic sinh hot cn phi lp t, khng cn lp t theo yu cu cng ngh sn xut ca cng trnh xy dng.

II. PHNG PHP LP DTON CNG TRNH:1. Tng dton cng trnh:

TT Loi cng trnh Chi phchung

Thu nhpchu thutnh trc

1 Xy lp cng trnh dn dng 58,0 5,52 Xy lp cng trnh cng nghip, trm thuin nh 67,0 5,53 Xy dng cng trnh thuin, ng dy ti in,

trm bin th 71,0 6,0

4 Xy dng ng hm, hm l, lp t my trongng hm, hm l

74,0 6,5

5 Xy dng nn ng, mt ng 66,0 6,06 Xy dng cu cng giao thng, bn cng, cc cng

trnh bin64,0 6,0

7 Xy lp cng trnh thu li 64,0 5,5- Ring o p t th cng cng trnh thu li (trlc lng dn cng ngh a v)

51,0 5,0

8 Xy lp cng trnh thng tin bu in, thng tin tnhiu ng st, pht thanh truyn hnh 69,0 5,5

9 Xy dng v lp t b xng du ng ng dn dukh

66,0 6,0

10 Xy dng trm tri cc loi, trng rng, trng cycng nghip, khai hoang xy dng ng rung

55,0 5,5


20/28

1.1 Nguyn tc lp tng dton:- Cng trnh xy dng c yu cu k thut cao, iu kin a cht phc tp phi thc hin thit k k thut trc khi thit k bn v thi

cng (cng trnh thit k 2 bc) th tng d ton lp theo thit k k thut.- Cc cng trnh c k thut n gin, hoc c thit k mu ch thc hin thit k k thut- thi cng th tng d ton lp theo thit k

k thut thi cng.a/ Chi ph xy lp:

- Cng trnh c yu cu phc tp phi thc hin thit k 2 bc: thit k k thut (thit k trin khai), thit k bn v thi cng(thit k chitit) th chi ph xy lp c xc nh trn cskhi lng cng tc xy lp theo thit k k thut v n gi xy dng cbn ca cc loicng tc hoc kt cu xy lp c lp ph hp vi thit k k thut.

- Nhng cng trnh ch thc hin bc thit k k thut thi cng th chi ph xy lp c xc nh trn cskhi lng cng tc xy lptheo thit k k thut- thi cng v n gi xy dng cbn ni xy dng cng trnh do UBND cp Tnh ban hnh.

- Nhng hng mc cng trnh thng dng th chi ph xy lp c xc nh trn cstng din tch sn hay cng sut thit k ca hngmc cng trnh v mc gi tnh theo mt n v din tch hay mt n v cng sut s dng ca hng mc cng trnh.

- i vi cc hng mc cng trnh thuc khu ph trnh tm ca cng nhn c thc hin nh sau:+ Chi ph xy dng khu ph trc lp thnh d ton ring tu thuc vo thit k c th theo quy m v tnh cht ca tng hng mc

cng trnh. D ton c lp theo phng php lp d ton xy lp hng mc cng trnh.+ Ch ph xy dng nh tm ca cng nhan xy dng c tnh ton cn c vo nhu cu cn thit ca loi nh tm cn xy dng nhng

phi m bo nguyn tc khng vt qu 2% gi tr xy lp trong tng d ton c ph duyt ca cng trnh (i vi cng trnh mi khicng xy dng xa khu dn c, nhng cng trnh i theo tuyn (ng x, knh mng cp I, ng lm nghip, ng dy) v khng vtqu 1% gi tr xy lp trong tng d ton c ph duyt ca cng trnh (i vi cc cng trnh khc).

Chi ph khu ph tr, nh tm ca cng nhn xy dng c tnh trong gi ca gi thu (i vi cng trnh thc hin u thu) hoc khongn cc chi ph ny (i vi cng trnh c cp c thm quyn chnh thu).

b/ Chi ph thit b:

- Chi ph thit bc xc nh theo s lng tng loi thit b v gi tr tnh cho mt tn hoc mt ci thit b ca loi tng ng. Trong gi tnh bao gm: gi mua, chi ph vn chuyn t cng hoc ni mua n cng trnh, chi ph lu kho, lu bi, lu container (nu c) ti cngVit Nam (i vi thit b nhp khu) chi ph bo qun, bo dng ti khi bi hin trng, thu v ph bo him thit b cng trnh. Trng hpu thu th gi thit b l trng thu ( gm cc ni dung ni trn) v cc khon chi ph khc (nu c) c ghi trong hp ng.

Ring i vi cc thit b phi tiu chun cn sn xut, gia cn th chi ph cho cc loi thit b ny c xc nh trn cskhi lng cnsn xut, gia cng v mc gi sn xut gia cng tnh cho mt tn hoc mt ci ph hp vi tnh cht, chng loi thit b phi tiu chun v cckhon chi ph khc c lin quan nh d ni phn trn.

c/ Chi ph khc:

Bao gm cc chi ph khng thuc chi ph xy lp, chi ph thit b. Cc khon chi ph ny c xc nh theo nh mc tnh bng t l (%)hoc bng gi c th v c chia thnh 2 nhm:

- Nhm xc nh theo nh mc bng t l (%) gm:+ Chi ph thit k+ Chi ph ban qun l d n+ Chi ph, l ph thm nh v chi ph t vn khc...

- Nhm xc nh bng cch lp d ton cc loi chi ph nh:+ Kho st xy dng+ Tuyn truyn qung co d n+ o to cng nhn, cn b k thut, cn b qun l sn xut+ Thu chuyn gia vn hnh sn xut th (nu cn )+ n b v t chc thc hin trong qu trnh n b t ai hoa mu+ Di chuyn dn c v cc cng trnh trn mt bng xy dng+ Phc v cng tc ti nh c v phc hi (nu cn)

d/ Dphng ph:

nh mc d phng trong tng d ton cng trnh c tnh bng 10% trn tng chi ph xy lp, chi ph thit b v chi ph khc.1.2 Phng php v trnh tlp tng dton cng trnh:Tng d ton l ti liu xc nh ton b vn u t cn thit xy dng cng trnh v c lp bc thit k k thut (i vi cng

trnh thit k 2 bc) hoc thit k k thut thi cng (i vi cng trnh thit k 1 bc) tng d ton cng trnh bao gm:

+ Ch ph xy lp (GXL)

+ Chi ph thit b (GTB)

+ Chi ph khc (GK)

+ Chi ph d phng (GDP)

Tng d ton cng trnh tnh theo cng thc

GTDT = GXL + GTB +GK +GDP (i)

a/ Tnh gi tr dton xy lp:

a.1 Ti liu cn thit tnh d ton xy lp:- Bo co nghin cu kh thi c duyt- H sthit k k thut- Khi lng cng tc xy lp c tnh ton h s thit k k thut hoc thit k k thut thi cng ph hp vi danh mc ca n gi

tng hp.

- Thit k mt bng thi cng tng th- n gi tng hp c lp ph hp vi bc thit k k thut (i vi tng d ton cng trnh theo thit k k thut).- n gi xy dng chi tit do Ch tch U ban nhn dn cc tnh, thnh ph ban hnh (i vi tng d ton cng trnh theo thit k k

thut thi cng).


21/28

- Gi tnh cho mt n v din tch hay mt n v cng sut s dng (i vi d ton cc hng mc cng trnh thng dng)- Cc ch chnh sch c lin quan n XDCB.a.2 Phng php tnh d ton xy lp cng trnh (hay cm cng trnh)L tp hp ton b chi ph xy lp tng hng mc cng trnh, loi cng tc hoc kt cu xy lp ca cng trnh .Chi ph xy lp cng trnh c tnh theo cng thc sau:

GXL

= (2)

Trong :

: Gi tr d ton xy lp trc thu ca hng mc cng trnh th i

: Mc thu sut thu gi tr gia tng quy nh cho cng tc xy dng lp t

Ch :

- i vi nhng hng mc cng trnh xy dng theo thit k ring bit th gi tr d ton xy lp trc thu ca hng mc cng trnh ctnh theo phng php "Lp dton chi tit cc hng mc cng trnh" s trnh by phn 2.

- i vi nhng hng mc cng trnh thng dng (nh nh , nh lm vic, hi trng, kho tng, ng s, sn bi...) c xy dng theothit kin hnh hoc thit k hp l kinh t c trong bng gi (tnh cho mt n v din tch hay mt n v cng sut) th d ton xy lptrc thuc xc nh theo cng thc sau:

= Pi x Si (3)

Trong :

Pi: mc gi tnh cho mt n v din tch hay mt n v cng sut s dng ca hng mc cng trnh th i.

Si: din tch hay cng sut s dng ca hng mc cng trnh th i

b. Tnh gi tr dton mua sm thit b:

b.1 Ti liu cn thit tnh gi tr d ton mua sm thit b cng ngh- Bo co nghin cu kh thi c duyt- Danh mc v s lng cc thit b cn lp t v khng cn lp t theo yu cu ca cng ngh sn xut ca cng trnh xy dng.- Gi mua cc thit b (theo ci hay theo tn thit b)- Gi cc vn ti bc xp.- nh mc chi ph tnh theo t l (hay theo d ton) ca cng tc bo qun bo dng c cp c thm quyn ban hnh.- Cc ch, chnh sch khc c lin quan.

b.2 Phng php tnhGi tr d ton mua sm thit b cng ngh ton b cng trnh c tnh theo cng thc sau:

GTB

= (1 + ) (4)

Trong :Q

i: l trng lng (tn) hoc s lng (ci) thit b (nhm thit b) th i

Mi: gi tnh cho 1 tn hoc 1 ci (1 nhm) thit b th i ca cng trnh

Mi= m

i+ n

i+ k

i+ v

i+ h

i(5)

mi: gi tr ca thit b th i ni mua (ni sn xut, ch to hoc ni cung ng thit b cng ngh ti Vit Nam) hay gi tnh n cng

Vit Nam (i vi thit b nhp khu)

ni: chi ph vn chuyn 1 tn hoc 1 ci (1 nhm) thit b th i t ni mua hay t cng Vit Nam n cng trnh

ki: chi ph lu kho, lu bi, lu container 1 tn hoc 1 ci (1 nhm) thit b th i (nu c) ti cng Vit Nam (i vi thit b nhp khu)

vi: chi ph bo qun, bo dng 1 tn hoc 1 ci (1 nhm) thit b th i ti hin trng.

hi: thu v ph bo him thit b th i

: mc thu sut thu gi tr gia tng quy nh i vi tng loi thit b

- Ring i vi cc thit b phi tiu chun cn sn xut gia cng th chi ph cho cc loi thit b ny c xc nh trn cskhi lngthit b v mc gi sn xut, gia cng tnh cho 1 tn hoc 1 ci ph hp vi tnh cht chng loi thit b v cc khon chi ph khc c lin quan.

c. Tnh chi ph khc:

c.1 Ti liu cn thit tnh chi ph khc- Bo co nghin cu kh thi- H sthit k k thut hoc thit k k thut thi cng- Thit k mt bng thi cng tng th- Bng gi kho st, thit k, t vn...- Cc vn bn thng t, chnh sch c lin quan n xy dng cbn.c.2 Phng php tnhGi tr d ton chi ph khc c tnh theo cng thc:

Gk

= x (1 + ) (6)

Trong :

Bi: gi tr ca khon mc chi ph khc th i thuc nhm chi ph, l ph tnh theo nh mc t l %

Ci: gi tr ca khon mc chi ph khc th i thuc nhm chi ph khc tnh bng cch lp d ton

=

+n

i

XL

GTGT

i

XL Tg1

)1(

i

XLg

XL

GTGTT

i

XLg

=

n

i 1

QiMi TBGTGTT

TB

GTGT

T

= =

+m

i

m

J

i CB

1 1

1 )( kGTGTT


22/28

: mc thu sut thu gi tr gia tng theo quy nh i vi tng loi chi ph khc l i tng chu thu gi tr gia tng.

d. Tnh chi ph dphng

Chi ph d phng (gm d phng do khi lng pht sinh v d phng do yu t trt gi) c tnh bng 10% trn ton b chi ph xylp, chi ph thit b v chi ph khc ca cng trnh. c tnh theo cng thc:

GDP

= (GXL

+ GTB

+ GK

) x 10% (7)

1.3 H s, biu mu tng dton:a. H stng dton bao gm:

- Ttrnh xin duyt tng d ton- Bn thuyt minh tng d ton- Biu tng hp d ton, cc biu tng hp ring tng khon mc chi ph bao gm: chi ph xy lp, chi ph thit b, chi ph khc v biu

tnh khi lng cng tc xy lp (theo hnh thc v ni dung trong mc 2 di y).b. Biu mu tng dton

Biu tng hp tng dton (biu s 1 - TDT)Ngy ...... thng ...... nm ......

Tn cng trnh:

Biu tng hp chi ph xy lp (biu s 2-TDT)Ngy ...... thng ....... nm

Tn cng trnh:

Ghi ch: Gi tr d ton xy lp trc thu ca tng hng mc cng trnh xc nh theo phng php nu trong im a.2 (phng php tnhd ton xy lp cng trnh).

Biu tng hp chi ph thit b (biu s 3 - TDT)

Ngy ........ thng .......... nm .........Tn cng trnh:

k

GTGTT

TT Khon mc chi ph Gi tr trcthu

Thu GTGTu ra

Gi tr sauthu

1 Chi ph xy lp GXL

2 Chi ph thit b GTB

3 Chi ph khc- Giai on chun bu t - Giai on thc hin u t - Giai on kt thc xy dng a d

n vo khai thc s dng

4 Chi ph d phng GDP

Tng cng: (1 + 2 + 3 + 4) GTDT

Ngi tnh Ngi ki m tra Cquan lp

TTTn hng mc cng

trnhGi tr d ton xy lp

trc thuThu GTGT

u raGi tr d ton

xy lp sau thu

1 Hng mc ..............2 Hng mc ..............3 Hng mc ..............

Tng cng GXL


TTTn thit bhay nhm

thit b

nv

Slng

Gimua

Thnhtinmua

thit b

Chi ph vnchuyn

Chi ph lukho, lubi, luContainer

(nu c) ticng Vit

Nam

Chi phbo qun

Phbohim

Tnggi trtrcthu

ThuGTGTu ra

Tnggi tr

sauthu

1 2 3 4 5 6 7 8 9 10 11 12 13I. Thit bphi lp--

II. Thit bkhnghi l

C th tnhchung cho

ton b hoctnh cho

tng thit b

C th tnhchung cho

ton bhoc tnhcho tngthit b

--

III. Thit bphi tiu

chun phigia cng


23/28

Biu tng hp chi ph khc (biu s 4 - TDT)Ngy .... thng .... nm ....

Tn cng trnh

Biu tnh khi lng cng tc xy lp ch yu (biu s 5 - TDT)

Ngy .... thng .... nm ....Tn cng trnh:

2. Phng php lp dton xy lp chi tit cc hng mc cng trnh:2.1 Nguyn tc v phng php tnh:+ Gi tr d ton xy lp sau thu ca hng mc cng trnh bao gm: gi tr d ton xy lp trc thu v khon thu gi tr gia tng u

ra.+ Gi tr d ton xy lp trc thu ca hng mc cng trnh bao gm chi ph trc tip, chi ph chung v thu nhp chu thu tnh trc.- Chi ph trc tip: bao gm chi ph vt liu, chi ph nhn cng v chi ph s dng my thi cng. N c xc nh trn cskhi lng

cng tc xy lp nhn (x) vi n gi xy dng ca cng tc xy lp tng ng.- Chi ph nhn cng trong n gi bao gm tin lng cbn, cc khon ph cp c tnh cht lng v cc chi ph theo chi vi

cng nhn xy lp m c th khon trc tip cho ngi lao ng tnh cho mt ngy cng nh mc (p dng theo cc vn bn hng dn canh nc ti thi im tnh ton).

+ Cc khon ph cp: bao gm ph cp lu ng mc thp nht bng 20% tin lng ti thiu, ph cp khng n nh sn xut mcthp nht bnh qun bng 10% tin lng cbn, mt s khon ph cp (ngh h, tt, php...) bng 12% v mt s chi ph c th khon trc

tip cho ngi lao ng tnh bng 4% so vi tin lng cbn.+ i vi cc cng trnh c cquan c thm quyn ca nh nc cho php c hng thm cc khon ph cp lng v ch chnh

sch khc cha tnh vo chi ph nhn cng trong n gi nu trn hoc c hng ph cp lu ng mc cao hn 20% hay hng ph cpkhng n nh sn xut cao hn 10% th c b sung cc khon ny vo chi ph nhn cng trong d ton nhbng tng hp d ton xy lphng mc cng trnh (Bng 4-2).

sn xu


Cc khon chi ph khcGi tr trc

thu Thu gi tr gia

tng u raGi tr sau

thu

1. Giaion chu n b

u t-

--2. Giai on thc hin u t---3. Giai on kt thc xy dng a d nvo khai thc s dng--Tng cng G

K


TT Loi cng tcnv

Kh i lng cng tcTngcngHng

m c 1Hngm c 2

Hngm c 3

Hngm c 4

v.v... Hngm c n

1 2 3 4 5 6 7 ..... m-1 m

Io p t, ct

1 o t2 p t---n v.v...

IICng tcng cc

1 ng cc tre2 ng cc g

3ng cc btng

---n v.v........

Ngi tnh Ngi kim tra Cquan lp


24/28

- Chi ph vt liu trong n gi tnh theo mc gi do lin sxy dng v ti chnh vt gi a phng thng bo ti thi im xy dngtp n gi.

- Chi ph my thi cng trong n gi tnh theo bng gi d ton ca my v thit b xy dng ban hnh km theo Quyt nh s1260/1998Q-BXD ngy 28/11/1998 ca B trng B Xy dng.

- Chi ph chung c tnh bng t l (%) so vi chi ph nhn cng trong d ton xy lp. T l ny quy nh theo tng loi cng trnh doB Xy dng ban hnh (Bng 4-3).

- Thu nhp chu thu tnh trc c tnh bng t l (%) so vi chi ph trc tip v chi ph chung quy nh theo tn loi cng trnh (tiBng 4-3).

Bng 4.1 Biu tnh cc thnh phn chi ph trc tip theo n giTn cng trnh:Din tch s dng:Cc cn c lp d ton:

Ch :

+ tnh thnh tin cc chi ph ca tng loi khi lng cng tc ta ly khi lng ct (5) nhn vi gi VL ct (6) c kt qu ghi

vo ct (9).Tip tc (5) x (7) ghi vo ct (10)

(5) x (8) ghi vo ct (11)+ C tnh ln lt cc cng tc nh vy cho n ht cc cng tc ca cng trnh.

+ Cui cng cng theo ct (9) c Qj x QjVL l tng chi ph vt liu theo n gi

+ Cng ct (10) c Qj x DjNC l tng chi ph nhn cng theo n gi

+ Cng ct (11) c Qj x Djm l tng chi ph my thi cng theo n gi:

Bng 4.2. Bng tng hp dton xy lp hng mc cng trnh xy dng(Theo Thng ts03/2001/TT-BXD ngy 13-2-2001 ca B Xy dng)

Trong :

Qj: Khi lng cng tc xy lp th j;

DjVL, DjNC, Djm: Chi ph vt liu, nhn cng, my thi cng trong n gi xy dng ca cng tc xy lp th j;

F1: Cc khon ph cp lng (nu c) tnh theo tin lng ti thiu m cha c tnh hoc cha trong n gi xy dng.

F2: Cc khon ph cp lng (nu c) tnh theo tin lng cp bc m cha c tnh hoc cha trong n gi xy dng.

h1n: H s biu th quan h gia chi ph nhn cng trong n gi so vi tin lng ti thiu ca cc nhm lng th n:

h2n: H s biu th quan h gia chi ph nhn cng trong n gi so vi tin lng cp bc ca cc nhm lng th n:

TT S hiun giTn cng vic quy

cch n vKhilng

n gi Thnh tinVL NC M VL NC M

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)

1...... o t mng bng

nhm 4 ng thnhR


25/28

P: nh mc chi ph chung (%)TL: Thu nhp chu thu tnh trc;

gXL

: Gi tr d ton xy lp trc thu;

GXL

: Gi tr d ton xy lp sau thu;

CLvl

: Chnh lch vt liu (nu c);

KNC

, KMTC

: H siu chnh chi ph nhn cng, chi ph my thi cng.

: Mc thu sut thu GTGT quy nh cho cng tc xy dng, lp t;

VAT: Tng s thu gi tr gia tng u ra (gm thu GTGT u vo tr khi mua cc loi vt t, vt liu, nhin liu, nng lng... vphn thu GTGT m doanh nghip xy dng phi np).

Bng 4.3 nh mc chi ph chung v thu nhp chu thu tnh trcn v tnh: %

3. Thm tra xt duyt ti liu dton:

Cc ti liu d ton c lp v trnh duyt cng mt ln vi ti liu thit kT chc c thm quyn ph duyt:3.1i vi nhng d n u t xy dng s dng vn ngn sch Nh nc, vn tn dng u t ca nh nc, vn tn dng do nh nc

bo lnh.a. D n nhm A (theo phn loi d n u t km theo Nghnh 52/1999/N-CP ngy 08/7/1999 ca Chnh ph) do:- B trng- Th trng cquan ngang B- Cquan thuc Chnh ph- Hi ng qun tr tng cng ty nh nc do Th tng Chnh ph trc tip qun l.- Ch tch U ban nhn dn cp tnhC d n u t ph duyt thit k k thut v tng d ton sau khi c B Xy dng ch tr t chc thm nh.b. D n nhm B, C thuc cc b, ngnh, cquan trung ng v cc tng cng ty nh nc. Ngi c thm quyn quyt nh u t d

n ng thi l ngi ph duyt thit k k thut v tng d ton sau khi c cquan c chc nng qun l xy dng ca cp quyt nhu t thm nh.

c. D n nhm B, C do a phng qun l. Ch tch UBND tnh ph duyt thit k k thut v tng d ton sau khi c sxy dnghoc sc xy dng chuyn ngnh thm nh (tu theo tnh cht ca d n). Ch tch UBND tnh c th u quyn cho gim c sxy dnghoc sc xy dng chuyn ngnh ph duyt cc cng trnh thuc d n nhm C do tnh qun l.

d. Chu tc php ph duyt thit k chi tit v d ton cc hng mc cng trnh ph (hng ro, nh thng trc) c gi tr di100 triu ng, khng lm nh hng n thit k k thut v tng d ton cng trnh c ph duyt.

3.2 Cc d n u t s dng vn u t pht trin ca doanh nghip nh nc, vn do doanh nghip t huy ng v vn tn dng thngmi khng do nh nc bo lnh

a. D n nhm A. T chc thm nh, ph duyt thit k k thut v tng d ton theo quy nh nhim a mc 3.1 trn.b. D n nhm B, C ngi c thm quyn quyt nh u t doanh nghip ng thi l ngi ph duyt sau khi cquan c chc nng

qun l xy dng ca doanh nghip thm nh.3.3i vi cc d n u t sn xut kinh doanh ca t nhn v cc t chc kinh t khng thuc cc doanh nghip nh nc, th chu

t chu trch nhim t chc thm nh v ph duyt.

- Nhm I: h2.1 = 1,378

- Nhm II: h2.2 = 1,370

- Nhm III: h2.3 = 1,363

- Nhm IV: h2.4 = 1,357

XL

GTGTT

TT Loi cng trnh Chi phchung

Thu nhp chuthu tnh trc

1 Xy lp cng trnh dn dng 58,0 5,5

2 Xy lp cng trnh cng nghip, trm thu innh

67,0 5,5

3Xy lp cng trnh thuin, ng dy ti in,trm bin th 71,0 6,0

4Xy dng ng hm, hm l, lp t my trongng hm, hm l

74,0 6,5

5 Xy dng nn ng, mt ng 66,0 6,0

6Xy lp cu cng giao thng, bn cng, cc cngtrnh bin

64,0 6,0

7 Xy lp cng trnh thu li 64,0 5,5

- Ring o, p t th cng cng trnh thu li(tr lc lng dn cng ngh a v) 51,0 5,0

8Xy lp cng trnh thng tin bu in, thng tin tnhiu ng st, pht thanh truyn hnh 69,0

5,5

9 Xy dng v lp t b xng du, ng ng dndu, dn kh

66,0 6,0

10Xy dng trm, tri cc loi, trng rng, trng cycng nghip, khai hoang xy dng ng rung 55,0 5,5


26/28

3.4 Cc d n c vn u t trc tip ca nc ngoi, vic thm nh thit k k thut v tng d ton c quy nh ring.4. Lp dton u thu xy lp:

4.1 Khi nim: tham gia u thu mt cng trnh xy dng th cc n v xy lp tham gia d thu cn phi lp d ton chi tit xy lp cho cng trnh

xc nh c gi u thu cng trnh, theo kh nng t chc qun l xy dng v trnh k thut thi cng ca n v mnh.4.2 Phng php lp dton u thu:Mun thng thu th n v tham gia u thu phi xy dng c gi d thu ca n v mnh sao cho c kh nng thng thu (thng l

thp, hp l hn gi d thu ca n v khc). Ni dung v phng php lp d ton u thu v cbn cng ging nh lp d ton xy lp chi

tit. - t c mc ch trn n v xy lp tham d thu phi c trnh t chc qun l xy lp tt. C cc bin php k thut tin tin,c phng tin thi cng hin i, t chc qun l v s dng lao ng hp l khoa hc... c hiu qu cao trong sn xut, tm cc ngun cungcp vt liu, nhn cng thun li. Trn cs xy dng c cc nh mc, n gi ni b (n gi ring) cho n v mnh mt cch hp lnhng vn m bo vic thc hin c cc khi lng cng tc xy lp ca cng trnh xy dng ng yu cu thit k, v ly lm cnc lp d ton u thu.

- Mt khc nghin cu tm bin php gim thp cc chi ph khc cc khu trong qu trnh chun b v thi cng cng trnh.- Cc khi lng cng tc phi xc nh t m ph hp vi nh mc, n gi ni b ca n v mnh v ph hp vi vic giao khon cho

tng i t xy dng hay tng cng nhn.- Trn nhng cs nu, ni dung lp d ton u thu xy lp cng cbn ging nh lp d ton xy lp chi tit.

PHN BI TP TNG HP

Tnh tin lng v lp d ton cho cng trnh xy dng

CHNG V

THANH TON QUYT TON VN U TXY DNG CBN CNG TRNH HONTHNH

I. Thanh ton khi lng thc hin hay cng trnh hon thnh:1. Nguyn tc chung:

- Tt c cc cng trnh u t xy dng t mi ngun vn u tu p dng vic cp vn, cho vay v thanh ton vn u t theo gi trkhi lng thc hin c nghim thu.

- Vic thanh ton khi lng xy dng cbn thc hin c tin hnh gia chu t v cc t chc nhn thu ph hp vi phngthc u thu hoc giao thu.

- Vic cp vn thanh ton khi lng xy dng cbn thc hin (khng phn bit ngun vn) gia chu t v cc t chc c lin quantrong vic thc hin khi lng xy dng cbn hon thnh khi lng xy lp, mua sm, trang thit b...) u thc hin thng qua h thngcquan cp pht thanh ton v phi c ghi trong k hoch u t xy dng cbn c cp c thm quyn ph duyt.

- Trong nm kt thc d n, chu t chc cp thanh ton ti a l 95% gi tr khi lng k hoch 5% cn li chc thanh tonsau khi c bo co quyt ton c duyt.

2. iu kin khi lng xy dng cbn thc hin c cp vn thanh ton:2.1.i vi xy lp:- Khi lng xy lp thc hin ca cng trnh, hng mc cng trnh c trong k hoch u t xy dng cbn c cp c thm quyn

ph duyt v phi c ghi trong hp ng kinh t v trong tng d ton ca c cng trnh. Nhng khi lng xy lp thc hin ngoi k hochv thit k d ton c hi ng thm tra phn cp xt duyt chp thun mi c thanh ton.

- C bin bn nghim thu, bn giao theo ng quy nh hin hnh ca nh nc.- C phiu gi thanh ton c lp tng ng vi khi lng thc hin trn csn gi thng nht v cc ch chnh sch do nh

nc quy nh.2.2.i vi thit b:- Cc thit b my mc cn lp t v khng cn lp t c trong danh mc thit bu t phi c trong k hoch u t xy dng cbn

c cp c thm quyn ph duyt, c hp ng mua bn hoc gia cng thit bc cp vn thanh ton.- Mi ln thc hin xong cc bc cng vic, vn chuyn bc xp, bo qun, gia cng thit bng quy trnh k thut theo hp ng k

gia chu t v cc t chc c lin quan th chi ph ca mi ln thc hin trn sc cp vn thanh ton.2.3.i vi cc chi ph khc:- Cc cng vic thuc chi ph khc c tnh cht xy lp, c cp c thm quyn cho php c p dng cp vn thanh ton nhi vi

khi lng xy lp thc hin.- Chi ph n b, gii phng mt bng th tng chi ph mi ln c cp vn thanh ton.- Cc chi ph khc cho cng tc chun bu tc cp thanh ton cho tng khon mc, chi ph tng ng vi khi lng cng vic

thc hin tng k trn cshp ng gia chu t v cc t chc c lin quan.- i vi cng tc kho st, thit k, chu tng trc cho cc t chc ny khng qu 30% gi tr kho st, thit k theo hp ng

kinh t k. Vic thanh ton c thc hin theo lch giao h sti liu, khi bn chu t nhn phi thanh ton 95% gi tr hp ng,cn 5% cc n v kho st, thit k s nhn c sau khi thc hin y ngha v ca mnh ghi trong hp ng kinh t.

Cc khon chi ph khc cn li c cp vn thanh ton theo d ton chi ph v k hoch u tc duyt.3. Cn c thanh ton:

- V khi lng cng tc phi c xc nh theo khi lng thc t hon thnh. Trng hp khi lng cng tc pht sinh khng ctrong thit k phi c bn chu t xc nhn, phi c kin ca cquan thit k v phi trnh duyt cquan cp trn, phi c bin bn bngiao.

- Cc bin lai chng t tm ng, tm chi.


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- Vn gi: gi c vt liu theo thng bo gi bn hng thng ca a phng xc nh chnh lch gi vt liu, khng c trong thngbo gi th phi da vo bin lai, ho n ca B Ti chnh.

4. Phng php tnh:Ni dung phng php thanh ton cng ging nh tnh d ton:- Tnh cc khi lng cng tc thc t hon thnh c ghi ch, din gii, c kin xt duyt cc khi lng pht sinh thm.- S dng bng n gi chi tit hin hnh tnh ra cc chi ph trc tip theo n gi- Tng hp gi tr d ton xy lp- Tng hp tng d ton cng trnh

II. Quyt ton cng trnh xy dng cbn hon thnh:1. Phm vi i tng:

- Tt c cc cng trnh u t xy dng cbn thuc khu vc nh nc khng phn bit quy m, hnh thc xy dng, ngun vn u t,khi hon thnh chu t phi c trch nhim quyt ton ton b vn u t vi cquan ch qun v cquan cp (cho vay) vn.

- Nu cng trnh u t bng nhiu ngun vn khc nhau th trong bo co quyt ton phi phn tch r theo ccu tng ngun vn.- Cc d n u t nhiu nm khi bo co quyt ton chu t phi quy i vn u t thc hin v mt bng gi ti thi im bn

giao a vo vn hnh xc nh gi tr ti sn cnh bn giao (B Xy dng c trch nhim hng dn phng php quy i).- Cc n v nhn thu phi quyt ton vi cp trn ca mnh v kt qu ti chnh.

2. Cc cn c lp quyt ton cng trnh:- H shon cng- Cc bin bn nghim thu, bn giao tng phn, tng loi cng tc c ch k xc nhn ca cp trn.- Cc vn bn xc nhn ca cc bn v ca cp trn v khi lng pht sinh so vi h sthit k duyt.- n gi chi tit a phng, gi ca my.- Bng nh mc d ton chi tit- Bng gi vt liu theo thng bo hng thng ca lin SXy dng - Ti chnh - Vt gi a phng.- Nu s dng cc loi vt liu khng c trong bng thng bo gi vt liu th phi da trn bin lai, ho n ca B Ti chnh.- Cc thng t hng dn v lp d ton v thanh quyt ton cng vi cc nh mc v t l quy nh cc khon chi ph.

3. Ni dung quyt ton cng trnh:Ni dung lp quyt ton cng trnh ging nh lp d ton.- Tnh khi lng thc t xy dng (theo bn v hon cng) ca cc loi cng tc ly lm cn c v da vo n gi chi tit ca a

phng tnh ra chi ph trc tip.- Da theo cc thng bo, hng dn v lp d ton v cc quy nh v cc h siu chnh (nu c) cng vi cc t l chi ph ti thi

im lm quyt ton (nu c) thay i gi c vt liu, thay i cc h s hay cc t l quy nh ...) hai bn chu t v cc t chc xy lpnhn thu phi thng nht v thi im p dng n gi, h s v t l quy nh, cn tng hp theo cc vn cbn sau

- Xc nh tng s vn thc t u t cho cng trnh bao gm chi ph cho vic chun bu t, thc hin u t.- Xc nh cc khon thit hi khng tnh vo gi thnh cng trnh (thit hi do thin tai, dch ho...)

- Xc nh tng vn u t thc t tnh vo cng trnh:Tng s vn u t tnh vo cng trnh bng (=) tng s vn u t thc tu t xy dng cng trnh tr (-) cc chi ph thit hi c

nh nc cho php khng tnh vo gi thnh cng trnh.- Xc nh gi tr ti sn cnh v phn loi ti sn cnh.- Xc nh y gi tr ti sn cnh, ti sn lu ng ca cng trnh chuyn giao cho n v khc s dng hch ton tng gim

vn u t.+ Quyt ton cng trnh theo 2 loi gi:

Gi thc t ca vn u t xy dng cbn s dng hng nmGi quy i v thi im bn giao a cng trnh vo vn hnh.

4. H squyt ton cng trnh:H sbo co quyt ton c lp theo biu mu quy nh bao gm:a. Biu quyt ton xy lp cho cng trnh:

Tng hp gi quyt ton (theo ni dung tng hp d ton)- H siu chnh- Khi lng cng tc xy lp tng hay gim so vi d ton, gii thch l do

+ Do tnh tin lng cha st vi quy cch trong n gi+ Do khi lng pht sinh: do thin tai, d ch ho so vi thit k phi c xc nhn ca cquan thit k v chu t trong bin bn.+ Nhng khi lng cha c trong d ton

- n gi c phn no khc so vi n gi tnh trong d ton v thuyt minh nu r+ Do thay i thit k: thay i chng loi vt liu, yu cu k thut+ Do thay i v gi c vt liu, ch tin lng.+ Do n gi p dng trong d ton cha ph hp...

b. Biu tnh chi ph trc tip cc khi lng cng tc xy lp:

TT Loi cng tc Khi lng n gi Thnh tin So snh

DT QT DT QT DT QT DT QT

TTS

hiun

Loicngtc

nv

Khilng n gi

Thnh tin


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c. Biu tng quyt ton vn u ttheo hng mc cng trnh:

5. Thi hn gi bo co quyt ton:- Hng nm khi kt thc nm k hoch, chu t phi hon thnh bo co vn u t thc hin ca nm trc gi cquan cp pht vn

hoc cho vay vn gi v B hoc U ban nhn dn tnh, thnh ph trc thuc Trung ng.- i vi d n nhm A chm nht l 6 thng v cc d n cn li (B, C) chm nht l 3 thng sau khi d n u t hon thnh a vo

vn hnh s dng chu t phi hon thnh bo co quyt ton vn u t gi cquan cp pht hoc cho vay vn, cquan c chc nngthm tra quyt ton ca b hoc tnh v cquan c thm quyn ph duyt quyt ton.

6. Thm tra v ph duyt quyt ton:Trc khi ph duyt quyt ton vn u t d n hon thnh phi tin hnh thm tra.+ i vi d n thuc nhm A, B Ti chnh c trch nhim ch tr thm tra.+ i vi cc d n cn li do cc b hoc tnh, thnh ph t chc thm tra.Cquan ti chnh c trch nhim thm tra v c kin nhn xt bng vn bn trc khi cp c thm quyn ph duyt quyt ton.- Ph duyt quyt ton.

+ i vi cc d n thuc nhm B, C ngi c thm quyn quyt nh u tng thi l ngi ph duyt quyt ton.+ i vi cc d n thuc nhm A, Th tng Chnh ph u quyn B trng B Ti chnh ph duyt quyt ton.

+ i vi vn u t thc hin hng nm, cquan cp pht hoc cho vay vn tin hnh kim tra s vn s dng theo k hoch cduyt.

+ Thi gian ph duyt quyt ton ca cp quyt nh u t khng qu 1 thng (i vi quyt ton vn u t d n nhm A), khngqu 15 ngy (i vi quyt ton vn u t d n B, C) sau khi nhn c bo co kt qu thm tra quyt ton vn u t do cquan (n v)ch tr thm tra trnh duyt.

gi

VL NC MTC VL NC MTC

Hngmc

Cng sutthit k

D tonc duyt

Vn u t thc hin

Tng sChia ra

XL TB Chi ph khc

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