150811-Tieu Chi Ky Thuat Cong Tac Thi Cong Phan Ngam - The Central 1

Cng ty c phn T vn thit k v u t dth

Tiu ch k thut Cng tc thi cng

(Phn ngm)

D n: Vinhomes Central Park

Cng trnh: The Central 1

Ch u t : Cng ty c phn u t xy dng Tn Lin Pht

a im: Phng 12 Qun Bnh Thnh TP. H Ch Minh

HH NNii,, 22001144

Cng ty c phn T vn thit k v u t dth

Tiu ch k thut Cng tc thi cng

(Phn ngm)

D n: Vinhomes Central Park

Cng trnh: The Central 1

Ch u t : Cng ty c phn u t xy dng Tn Lin Pht

a im: Phng 12 Qun Bnh Thnh TP. H Ch Minh

Ch u t N V T VN THIT K

C.TY C PHN U T XY DNG

TN LIN PHT

C.TY C PHN T VN THIT K V

U T DTH

Nhng ngi thc hin

Ch tr kt cu: Ths. V Mnh Tng

Ngi thc hin : Ks. Phm c Quang

Kim : Ks. Phng Quc nh

Vinhomes Central Park

DTH-2014 Page 1

Phn 1

TIU CH K THUT

CC CNG TC B TNG

- I CC, GING MNG, V TNG HM.

1.1. CC YU CU CHUNG V K THUT 1.1.1. Ni dung cc cng vc

- Cc cng tc kt cu phn ngm bao gm cc cng vic v o, p t, i cc, dm mng v cc cng vic khc theo ng vi yu cu k thut v bn v thi cng;

- Kim tra cc ng tim ct ca cng trnh; - o cc kch thc ti hin trng; - cha ch v u ni cn thit cho cc cng vic khc; - Cc cng vic d phng trnh nh hng ca vic dn n hay co ngt; - Th vt liu theo cc tiu chun v yu cu hin hnh ca ngi kim tra cht lng; - Thc hin cc bin php thi cng; - Cc bin php gi n nh ca cc cng trnh bn cnh xung quanh khu vc o t

nu cn thit;

- Sa cha cc cng trnh do nh thu lm hng (nu c); - Dn sch v chuyn cc cht thi. 1.1.2. Tiu chun.

Cc tiu chun p dng u phi ph hp vi Quy chun Vit Nam, ngoi tr cc

quy nh ring trong bn v thit k, cc tiu chun sau s c p dng trong ti liu

ny:

TCVN 2737-1995 Ti trng tc ng, tiu chun thit k

TCXDVN 5574- 2012 Kt cu b tng ct thp- tiu chun thit k

TCXDVN 5575- 2012 Kt cu thp- Tiu chun thit k

TCXDVN 239-2006 B tng nng- Ch dn nh gi cng trn kt cu cng trnh

TCVN 4506- 1987 Nc cho xi mng v va, yu cu k thut

TCVN 1770-1986 Ct xy dng, yu cu k thut

TCVN 6260-1997 Xi mng pooc lng hn hp. Yu cu k thut

TCVN 4453-1995 Kt cu b tng, b tng ct thp ton khi. Quy phm thi cng v nghim thu

TCVN 3106-1993 Hn hp b tng nng. Phng php th st


DTH-2014 Page 2

TCVN 3105-1993 Hn hp b tng nng. Ly mu, ch to v bo dng mu th.

TCVN 3116-1993 B tng nng, Phng php xc nh chng thm nc

TCVN 4447-1995 Cng tc t Quy phm thi cng v nghim thu

TCXDVN 374-2006 Hn hp b tng trn sn Cc yu cu c bn nh gi cht lng v nghim thu

TCVN 5308-91 Quy phm k thut an ton trong xy dng

TCXDVN 170-1989 Kt cu thp. Gia cng lp dng v nghim thu

TCVN 1651-2008 Ct thp b tng phn 1,2,3

Cc tiu chun lin quan khc.

1.1.3. Thit k bin php thi cng

Nh thu phi tun th cc yu cu ca Tiu chun k tht v h s thit k lp

bin php thi cng cho tt c cc hng mc cng trnh s thc hin cho d n.

Cc bn v thi cng lp t bao gm:

- Cc cu to chi tit s tin hnh lp t. Nh thu khi thc hin cc bn v ny cn tun th cc nguyn tc nu trong hp ng nhng nh thu sau khi tham kho

kin ca i din Ch u t th c th thay i cu to chi tit nu nh vic thay i

ny c th ci tin thit k ban u.

- Cc chi tit v cc ch ghp, ni, trang tr gn vo hay cc chi tit khc m Nh kin trc thy l cn thit th phi c v theo t l 1:1.

- Cc kch thc trong bn v c tnh theo h mt (mt v milimt). - H s bin php thi cng mng v tng hm phi ch r trnh t thi cng, bin php

chng trong qu trnh o t, bin php chuyn ch vt liu, bin php bo v

mi trng, an ton lao ng,

1.1.4. Ph duyt bin php thi cng

Bn v v thuyt minh bin php thi cng mng v tng hm do nh thu lp phi

c mt nh t vn c lp thm tra v trnh cho C quan chc nng cp php.

H s thit k bn v thi cng phi c i din ch u t kim tra v ph

duyt trc khi s dng, tuy vy nh thu vn phi chu trch nhim v tnh chnh xc ca

cc kch thc, v ni dung bn v.

1.1.5. Theo di bin dng nn v nc ngm

Trc khi thi cng, Nh thu nu cn thit nh thu phi h thng quan trc ln ca

nn t v cng trnh theo di bin dng v chuyn v ca nn t. Cc im quan trc

ny khng t hn 06 im trong cng trnh v 06 im ngoi hng ro cng trnh . Trong

thi gian ang thi cng tng hm vic quan trc cn phi c o hng tun, thm ch


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hng ngy trong trng hp cn thit, vic quan trc s c o hng thng khi cng vic

tng hm hon tt.

Nh thu cng cn thit lp bng kinh ph ca mnh h thng quan trc mc nc ngm

trn cng trng. Kt qu quan trc phi c o hng tun trong thi gian thi cng tng

hm, v hng thng sau khi xong tng hm.

Tt c cc bo co quan trc ln v mc nc ngm cn c gi cho i din ch u

t theo k hoch.

1.2. CNG TC O T

1.2.1 Quy trnh o t v vn chuyn

Trc khi tin hnh o t Nh thu xy dng phi trnh phng n o t,

phng n vn chuyn t ra khi cng trng. Nh thu phi trnh gii php theo

trnh t thi gian v phng n o t phi ph hp vi thit k bin php thi cng

c ph duyt.

1.2.2. S dng t o ln

Trong trng hp cn s dng t o ln phc v cng tc san lp sau ny th

Nh thu cn c kho bi tm thi, cc kho bi ny khng c lm nh hng n hot

ng ca cng trng v phi c s ng ca T vn hoc i din ch u t.

1.3. CNG TC B TNG

1.3.1 Tiu chun p dng

Ngoi tr c qui nh khc trong ch dn k thut ny, khi ni n qui chun v

tiu chun xy dng khc nhau ngha l ni n phin bn hin hnh ti thi im

u thu.

Ch dn k thut ny c c cng vi cc qui chun v tiu chun Vit Nam hoc

tiu chun Eurocode c lin quan (khi m tiu chun Vit Nam khng cp v s c

ch nh c th trong thuyt minh tnh ton). Khi c s khc bit th yu cu cao hn s c

p dng.

Tr khi c quy nh khc ni trong ch dn k thut ny, cng tc b tng phi

tun theo cc tiu chun sau:

TCVN 5574:2012 Kt cu b tng ct thp tiu chun thit k

TCVN 5724:1993 Kt cu b tng v b tng ct thp - iu kin k thut ti thiu

thi cng. v nghim thu"

TCVN 4453:1995 "Kt cu b tng v b tng ct thp ton khi - Quy phm thi

cng v nghim thu"

TCVN 5718:1993 "Mi v sn b tng ct thp trong cng trnh xy dng - Yu

cu k thut chng thm nc"


DTH-2014 Page 4

TCVN 9361:2012 "Cng tc nn mng -Thi cng v nghim thu"

TCVN 2682:1999 "Xi mng pooc lng"

TCVN 6260:1997 "Xi mng poc lng hn hp - Yu cu k thut"

TCXD 127:1985 "Ct mn lm b tng v va xy dng - Hng dn s dng"

TCVN 1770:1986 "Ct xy dng - Yu cu k thut"

TCVN 1771:1987 " dm si v si dm dng trong xy dng - Yu cu k

thut"

TCVN 5592:1991 "B tng nng Yu cu bo dng m t nhin"

TCVN 9345:2012 "Kt cu b tng v b tng ct thp - Hng dn k thut phng

chng nt di tc ng ca kh hu nng m a phng"

TCXDVN 297:2003 ''Phng th nghim chuyn ngnh xy dng Tiu chun cng

nhn''

TCVN 7570:2006 Ct liu cho b tng v va yu cu k thut

TCVN 7572:2006 Ct liu cho b tng v va phng php th

TCVN 4506:2012 Nc trn b tng v va yu cu k thut

TCVN 8826:2011 Ph gia ho hc cho b tng

TCVN 3105:1993 Hn hp b tng nng v b tng nng - Ly mu, ch to v

bo dng mu th

TCVN 3106:1993 B tng nng - Phng php th st

TCVN 3118:1993 B tng nng - Phng php xc nh cng nn

TCVN 3119:1993 B tng nng - Phng php xy dng cng ko khi un

TCVN 3120:1990 B tng nng Phng php xc nh cng ko khi ba

1.3.2 Yu cu chung

1.3.2.1 nh ngha

a. Cp phi thit k

"Cp phi thit k" l cp phi b tng m cc thnh phn qui nh c trn ring l

v phi hp c ch ch t cng thit k hoc tha mn cc yu cu qui nh khc

ca b tng.

B tng c quy nh theo cng c trng (cp b tng), c bit l i vi hm

lng xi mng ti thiu v ti a cng nh i vi t l nc/xi mng ti a. Cp phi b


DTH-2014 Page 5

tng s dng cho Cng trnh v tr c bit no s theo nh th hin trn bn v.

Nh thu cn trnh cp phi thit k xut ph duyt. Cho d c s chp thun

ca K s t vn, Nh thu vn phi chu trch nhim v cc tnh cht cn thit ca cp phi

b tng, k c cng.

Cp phi b tng cn bo m khng xy ra hin tng b tng phn tng. Cp phi

phi c kh nng t c b mt hon thin nh q uy nh

Cc cp phi b tng - tr phi c nu khc nhm bo v chng li lp t xm thc

phi theo ng Ch nh k thut di y.

CH NH K THUT CHO CP PHI B TNG

Cp

55

50

45

40

35

30

25

20

15

10 Cng c

trng- N/mm 28 ngy tui

55

50

45

40

35

30

25

20

15

-

Hm lng xi mng ti thiu trong kg/m b tng m k

475

425

375

350

350

325

300

270

205

175

Hm lng xi mng ti a trong kg/m b tng m k

550

550

550

550

550

550

550

550

550

550

T l nc/xi mng ti a

0.4

0.45

0.45

0.5

0.5

0.5

0.55

0.6

0.7

0.8

b. Cp phi qui nh

"Cp phi qui nh" l cp phi b tng c xut trong qui chun v tiu chun

xy dng Vit Nam.

c. Cp b tng

i vi cp phi thit k, cp b tng (B) l cp chu bn nn thit k ca b

tng theo tiu chun TCVN 5574:2012. Mc theo kh nng chng thm, k hiu W (Ch

nh i vi cc kt cu c yu cu hn ch thm). Trong mt s trng hp, cp b tng

c th c hu t T, W phn bit gia cc cp tng t nhng c mc ch s

dng khc nhau.

d. M t tng qut cng tc b tng

Kt cu cng trnh bng b tng ct thp ca d n c thit k theo cc tiu chun

Vit Nam hin hnh. Cng trnh bao gm tt c cng tc b tng th hin hoc m t trong


DTH-2014 Page 6

h s thit k, v c sa i hoc b sung trong giai on thi cng. Cng trnh c th bao

gm cc loi cp b tng v mc ch s dng khc nhau (b tng cho kt cu chnh v

cc kt cu ph) gm c b tng chng thm (cho sn, vch tng hm v b nc). Vic s

dng ca kt cu b tng c th hin trong bn v kin trc hoc kt cu.

1.3.2.2 Vt liu thnh phn

a. Tng qut

Vt liu phi c ph duyt: khi tiu ch k thut v bn v cho php nh thu la

chn vt liu s dng cho cng trnh, vt liu c la chn v ngun cung cp d kin phi

c i din ch u t ph duyt bng vn bn.

Ngun cung cp phi c xc nhn bng chng ch th nghim t nh cung cp chng

t rng vt liu tha mn yu cu qui nh. Mi thay i ngun cung cp phi c i din

ch u t ph duyt bng vn bn.

Vt liu phi tha mn cc tiu chun lin quan

Khi tiu chun Vit Nam c p dng, cc vt liu c s dng cho cc cng trnh

s p ng tiu chun lin quan. Ni chung tiu chun ban hnh bi nh sn xut mt loi

vt liu no s c xem xt, tr khi thit k da trn mt tiu chun c bit (quy nh

trong h s thit k), trong trng hp , tiu chun s c s dng nh gi vt

liu.

Gii hn v ngun cung cp

Nh thu phi ly cc vt liu t cng mt ngun cung cp, cng nhn hiu, cng nh

my, tr khi c i din Ch u t chp thun.

Nh thu phi ngh v trnh tt c cc ti liu cn thit lin quan n vic thay i vt

liu cho i din Ch u t ph duyt.

Cc n v th nghim

Nh thu phi trnh cc giy php kinh doanh v cc giy chng nhn trnh chuyn

mn ca n v th nghim c lp s c thu thit k cp phi b tng v thc hin cc

th nghim, c cp bi B Xy dng.

b. Xi mng

Xi mng dng sn xut b tng s l xi mng Portland thng thng (PC) theo

tiu chun TCVN 2682:1999 hoc l xi mng Portland Hn Hp (PCB) theo

TCVN 6260:1997. Cc loi xi mng khc ch c s dng khi c s ph duyt

ca i din ch u t.


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Nh thu phi trnh i din ch u t ph duyt nhn hiu xi mng d kin

s dng cng vi ti liu h tr k c danh sch cng trnh s dng. Tt c xi mng

uc s dng trong cng tc ny phi uc ly t cng ty hoc xng c ng k di h

thng qun l cht lng

Cc bao xi mng phi cn nguyn bao, cn nguyn nhn mc. Khng c s dng

cc bao hng v phi chuyn ngay ra khi cng trng.

Khi lu trong kho, chiu cao mt hng khng c qu 10 bao, c qut thng gi v

c cch mt t t nht 30cm.

Xi mng c cung cp dng ri, phi c bo qun trong cc si l c h thng

kim sot m v chng thm nc ph hp.

c. Vt liu xi mng th cp (SCM)

Khng p dng.

d. Ct liu

Tng qut

Ct liu bao gm vt liu trong thin nhin tr khi c ch nh hoc yu cu khc. Ct

liu phi tun th tiu chun TCVN 7570:2006 tr khi c ch nh khc. Trong cc

trng hp c bit, nh thu c th ngh thay i thnh phn ht qui nh trong tiu

chun TCVN 570:2006 nhng phi c s chp thun bng vn bn ca i din ch u t.

Thnh phn ht ct liu phi ph hp sn xut b tng c chc vi cc thnh

phn qui nh, c thi cng d dng khng b phn tng. Cp phi phi c

kim sot xuyn sut cng trnh ph hp vi cp phi trong th nghim ban u. Nh

thu phi thng bo vi K s gim st ngun gc ct liu trc khi tin hnh cng tc. Khi

c thnh phn ht thoi dt trong ct liu th hm lng ca n c gii hn trong bng sau:

Kch c ln nht ca ct liu Phn trm hm lng ht thoi dt ln

nht nh (CaCO3) theo dung trng kh

ca ct liu

Ln hn 10mm 8

10mm v nh hn 20

Hm lng ion clorua trong hn hp c s dng trong b tng ct thp d xut pht

t ct liu, nc hay ph gia hoc ngun gc no khc cng u khng c vt qu 0.2%


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khi lng xi mng s dng (bao gm bt k vt liu xi mng no) v xi mng phi ph hp

vi tiu chun TCVN 6260:1997.

Ct liu: trn nn sch, phng, cng, cc loi ct liu c ngn cch vi nhau v

sao cho ct liu khng b ln vo nhau

Tnh n nh

Nh thu phi c c cam kt ca nh cung cp cho ct liu th v ct liu mn v cht

lng v chng loi la chn rng ngun cung cp l y hon thnh hp ng, v

ct liu s c ly t ch mt ngun cha nghin. Ngun ny phi c k s gim st ph

duyt bng vn bn.

Hnh dng, cng v rng

Ct liu th phi c hm lng ht thoi dt khng vt qu 15 % i vi b tng

cng M40 tr ln v khng vt qu 35 % i vi b tng cng nh hn M40, khi

th theo TCVN 7572-13:2006 phn 13.

Xc nh khi lng th tch v rng theo TCVN 7572-6:2006 phn 6.

Kh nng ht nc ca ct liu th khng c vt qu 2.5% theo khi lng, ngoi

tr c bng chng chng minh rng cc vt liu nh vy khng c sn.

Ct liu t bin

Cc ct liu khai thc t bin s khng c php s dng nu khng c s ng

Mui

Tng hm lng mui ho tan v clorua trong ct liu khng c vt qu cc gii hn

di y khi c th nghim vi tiu chun theo TCVN 7572-15:2006

Loi ct liu

Hm lng clorua natri tnh theo

% khi lng ca ct liu kh

Mn

Th

0.08%

0.04%

e. Nc

Nc sinh hot c s dng trn b tng. Nu nc sinh hot khng c sn, ngun

thay th t tiu chun phi c chp thun bi i din ch u t bng vn bn. Nc c

s dng cho cng trnh phi ph hp tiu chun TCVN 4506:2012. Nc c cha hm

lng mui, ion sunfat, ion clorua nh hn qui nh trong TCVN 4506:2012.


DTH-2014 Page 9

Nu nc dng l nc ging khoan hoc bng cc ngun cung cp khc ngoi ngun

nc sinh hot chung ca thnh ph th Nh thu phi tin hnh th nghim nc bo

m tun th tiu chun TCVN 4506:2012.

f. Ph gia

Ph gia c th c cho php dng trong cp phi thit k do k s quyt nh, sau

khi nh thu trnh np cc chi tit thch hp ca ph gia vi thit k cp phi thch ng v

kt qu trn th.

Ph gia khng c php dng trong cp phi qui nh l nhng ph gia c cha

calcium chloride.

Ph gia phi tun th tiu chun TCVN 8826:2011 v c s dng theo ch dn

ca nh sn xut.

Nh thu cng phi tham kho ch dn k thut ca thit k v cc bn v v chi tit

ca ph gia chng thm s dng cho cc b phn khc nhau.

Nh thu nn c bit ch trong xut v trch nhim cng tc thi cng chng

thm.

1.3.2.3 Hn hp b tng

a. Thnh phn

B tng c sn xut bng xi mng, ct liu v nc. Nh thu hoc nh cung cp

khng c s dng mt thnh phn no khc m khng c s chng minh rng thnh

phn mi v cp phi b tng tho mn yu cu ca qui chun v tiu chun xy dng Vit

Nam hay cc tiu chun quc t khc (khi m tiu chun Vit Nam khng c p dng)

cng vi s ph duyt ca i din ch u t.

bo m bn vi phn ng kim Silic ioxt (ASR), thnh phn vt liu

trong hn hp b tng phi tun theo mt trong nhng yu cu sau y:

- Phn ng kim Silic ioxt ca ct liu ht th kt hp vi thnh phn ht mn th

khng tc dng c hi theo qui nh TCVN 7572-14-2006.

- Trong trng hp phn ng kim Silic ioxt ca ct liu ht th kt hp vi ct

liu ht mn c kh nng gy ra tc dng c hi c xc nh bi TCVN 7525 14-

2006, yu cu th nghim va phi c thc hin theo TCVN 7525-14-2006;

gin n cho php s nm trong khong 0,05 % tui 3 thng v 0.1 % tui

6 thng v phi c s chp thun trc khi tin hnh thi cng cng trnh.

Tng hm lng ion clorua trong hn hp b tng khng c vt qu 0.6kg trn


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1m3 b tng. Hm lng ion clorua c tnh ton t hn hp v c o hm lng

clorua ca tng thnh phn trong hn hp.

Tng hm lng sulphate ha tan trong hn hp b tng, nh SO3 khng c

vt qu 3% tnh theo khi lng xi mng Portland hay 3.5% tnh theo khi lng xi

mng Portland hn hp trong hn hp b tng. Hm lng sunpht hn hp l tng hm

lng ca tng thnh phn khc nhau trong hn hp.

b. Thit k cp phi b tng

Nh thu phi chun b vic thit k cp phi b tng cho mi cp b tng.

Nh thu phi yu cu i din ca cc n v sau c lin quan trc tip n cng

tc b tng tham d trn th, ly mu v th nghim mu trn th, bao gm nhng khng

gii hn cc n v sau:

a). i din Ch u t

b). Ch huy trng ca nh thu.

c). i din cho phng th nghim xy dng

d).Nh cung cp b tng trn sn

Thit k cp phi b tng cho mi mc b tng phi c thc hin ti thiu 30 ngy

trc khi bt u cng tc b tng.

Nh thu phi trnh thit k cp phi b tng cho mi mc b tng v tt c cc ti

liu c lin quan ln i din Ch u t xem xt v ph duyt. Ti liu trnh bao gm,

nhng khng hn ch:

a). Th nghim ct liu: ct liu th v ct liu mn

b). Th nghim nc, xi mng.

c). Cp phi xut.

d). Trn th v bin bn ly mu.

e). Kt qu th nghim mu b tng.

f). Thit k cp phi cui cng c xc nhn bi phng th nghim.

Nh thu phi thu xp v trnh thit k cp phi b tng thay th khi vt liu, cc iu

kin d n v cc iu kin khc cho thy c s thay i.

Nh thu khng c tin hnh cc cng tc b tng cho ti khi thit k cp phi

c i din Ch u t ph duyt.

Nh thu phi t chc chn rng cp phi qui nh cho kt cu chng thm ph hp


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vi ct liu c sn.

B tng cho kt cu chng thm phi dng ct liu th c cc thnh phn ht thoi dt

khng t qu 15%. Mc chng thm ca btng c thit k theo tiu chun TCVN

5574:2012 v 14TCN 63:2001. Phng php th nghim, tiu chun nghim thu v cc tiu

ch k thut tun theo tiu chun TCVN 3116:2007 v cc tiu chun ngnh 14 TCN.

c. Cp phi qui nh

Cp phi qui nh phi theo quy chun v tiu chun xy dng Vit Nam .

Tt c vt liu cho b tng phi c o lng theo trng lng.

d. Trn th (Trial Mix)

Hn hp mu th cho cp b tng theo tiu chun TCVN 9340:2012. Ly mu v th

nghim theo tiu chun TCVN 3105:1993.

Kt qu th nghim ban u phi c gi cho i din ch u t ngay khi c c

v trc khi trin khai cng tc b tng hin trng.

K S i din ch u t c th khng chp nhn kt qu th nghim trn th thc hin

trong phng th nghim nu nghi ng rng n khng i din c cho cht lng ca b

tng sn xut cho cng trnh.

e. Hn hp th

Nh yu cu trn, trc khi tin hnh cng tc b tng, Nh thu phi c hn hp

mu th, tt nht l cng iu kin t l hoc nu khng th, trong phng th nghim th phi

dng s lng mu biu hin cho ct liu v xi mng c dng. Trong trng hp

sau cng, phng th nghim phi a ra bng bo co v vic chun b v th nghim mu

th v phi c s chp thun ca K s t vn. Kt qu mu th c ly t 3 m b tng

ring bit s dng hn hp xut, thnh phn vt liu v di nhng iu kin sn xut hon

chnh.

lu ng ca mi m th c xc nh v sai s cho php nh trong tiu chun

TCVN 3106:1993 v TCVN 4453:1995.

Mi m ly ra 3 mu hnh lp phng v c th nghim sau 28 ngy. Cng trung

bnh ca 3 mu th hnh lp phng sau 28 ngy tui phi bng 1.3 ln cng ch nh

f. lu ng

lu ng ca mi mu th trong mi m c xc nh bng th nghim o st

nh trong TCVN 3106:1993.


DTH-2014 Page 12

g. S thay i hn hp

Khng c s thay i no ngoi gii hn ra trong TCVN 4453:1995 c cho

php trong t l thnh phn, ngun gc xi mng, ct liu hoc chng loi, kch c

hoc vng phn loi thnh phn c ht m khng cp trong Tiu ch k thut

ny.

h. B tng trn sn

B tng trn sn phi c sn xut trong cc trm trn c chp thun, p ng

c tiu chun.

Nh cung cp b tng phi c h thng bo m cht lng tun th cc yu cu ca

qui chun v tiu chun xy dng Vit Nam. H thng phi bao gm tt c cc kha cnh

v cung cp vt liu, cht lng, trn, vn chuyn trn, v cc c tnh ca b tng. Nh thu

phi cung cp bn sao chng ch ca trm trn cho mi m trn. Nh thu phi thng bo tt

c cc thay i v tnh trng ca cc trm trn trong qu trnh thi cng cng trnh .

B tng trn sn phi tun th tiu ch k thut ny. Nh thu phi lu tr tt c

phiu giao b tng kim tra trong sut qu trnh thi cng cng trnh. Tt c cc thnh phn

ca mi m trn phi c o lng v v trn ti trm trn ca nh sn xut. Khng c

thm nc hoc vt liu khc sau khi b tng ri trm trn.

i. Trn hn hp b tng

Tin hnh trn theo tng m, v c tin hnh sn xut theo tiu chun TCVN

5843:1994 v th nghim theo TCVN 3105:1993, TCVN 3107:1993, TCVN

3120:1993.

Cnh trn ca my phi c bo m trong sai s gii hn ch nh bi nh sn

xut. Cnh trn s c thay nu n khng cn trong dung sai cho php.

My trn b dng s dng lu hn 30 pht phi c lm sch trc khi m b

tng khc c trn. My trn phi c ra gia cc ln trn khi trn vi cc loi xi mng

khc nhau.

Nhit b tng ti khng c php di 5C. Vt liu b ng bng hoc

nhng vt liu c cha s khng c php s dng.

k. Nhng yu cu c bit i vi nhit b tng

Tng qut

Khi nhit ngoi tri trn 25C, vn khun no bng kim loi, b tng hoc

vt liu khc c kh nng ht nhit cao phi c lm lnh bng nc trc khi b tng.


DTH-2014 Page 13

Nhit ca b tng ti thi im khng c qu 32C. Nh thu phi c mt

nhit k ( c ph chun) ti v tr b tng kim tra nhit ca b tng bt c lc

no.

Nh thu phi b tr cc phng tin hiu qu nh lm lnh ct liu v nc trc

nu cn, duy tr nhit b tng di 32C trc khi . Nh thu phi lm vic vi

trm trn kim sot nhit b tng trc v trong qu trnh b tng.

b tng trong kh hu nng hoc gi mnh

i vi b mt b tng l ra ngoi di nhit cao ca mt tri hoc iu kin

gi kh mnh, nh thu phi cung cp tm chn bo v b tng mi sut thi gian bo

dng, v tm chn ny phi c t vo v tr khng tr hn na gi trc t m cui

cng. Nu b mt l ra b nt trong lc b tng cn do, n phi uc m li xa cc

vt nt.

Nhit do thy ha

Nhit ti a ca b tng bt k im no trong cu kin c khng

c vt qu 70C. Khi nhit ca b tng vt qu 70C nh thu phi thng bo v

nghin cu nguyn nhn.

Nhit chnh lch gia 2 im bt k trong b phn c khng c

vt qu 25C. Lm lnh b tng v/ hoc cch nhit phi c tin hnh khi cn thit bo

m nhng iu kin trn.

Trc khi nhng b phn c chiu dy ln hn 1,5m, nh thu phi chng

minh bng tm mu th i din dng nhit k rng nhit ti a v chnh lch nhit

khng vt qu qui nh. Nh thu phi xut kch thc v mt bng ca tm mu i

din, thit k cp phi, s lng v b tr cc nhit k k s ph duyt bng vn bn trc

khi bt u.

i vi b tng khi ln, cc yu cu c qui nh trong tiu chun

TCXDVN 305:2004 s c p dng nu c yu cu cht ch hn.

b tng trong thi tit lnh

Khi nhit xung quanh bng hoc di 5C, hoc c kh nng gim xung theo

chiu hng , nh thu khng c thc hin cng tc b tng nu khng c s ph

duyt ca k s gim st.

Nu d kin b tng khi nhit chung quanh di 5C, nh thu phi np

bin php thi cng v vic b tng trong kh hu lnh cho k s ph duyt. Chi tit ca


DTH-2014 Page 14

bin php thi cng phi bao gm nhng yu cu sau y:

(a) Cch ly khu vc b tng vi khu vc chung quanh gi

nhit ti thiu trn 5C ti bt k im no trong b phn c b tng;

(b) Duy tr nhit ca vn khun ti thiu 5C trc khi bt u b tng;

(c) Cc bin php theo di nhit cho nhit ti a v ti thiu trong khi b tng

c ;

(d) Cc bin php gi chnh lch nhit gia nhit cao nht v thp nht

trong vng 25C;

xut cng vic sa cha nu cc yu cu trn khng c thc hin t yu

cu.

l. Vn chuyn b tng

B tng c vn chuyn bng nhng xe chuyn dng, chng bi bn, ngn chn tnh

trng hao ht v b phn tng ca va b tng.

m. Hn hp b tng trn sn

Hn hp b tng c trn ti trm trn sn cn c chng nhn ca h thng kim

nh cht lng v qui nh cho hn hp b tng trn sn.

Tt c cc thnh phn ca hn hp va b tng ch c thm vo ti trm trn.

Sau khi b tng ri khi trm trn th khng c thm nc hoc vt liu no khc.

Mi ln chuyn ch phi km theo phiu giao hng c ng du vi thi gian trn v

khi lng ct liu thnh phn bao gm c nc v ph gia.

1.3.2.4 Bo dng b tng

Tt c b mt ca cu kin b tng phi c bo v khng mt m trong thi

gian bo dng, i vi b tng dng xi mng Portland, ti thiu 4 ngy u sau khi .

Vn khun gi li v tr c xem nh lp bo v cho b mt m n tip xc. Trc khi bt

u b tng nh thu phi c ph duyt trc cho xut v bin php bo dng.

Nh thu phi chun b cc tm ni lng thch hp sn sng cho mi t b

tng nhm bo v khi cn thit cho b tng mi khi cc tc nhn nh l

ma, gi mnh, sut thi gian bo dng..

Nh thu phi thc hin vic bo dng b tng ngay sau khi tun theo tiu

chun hin hnh. Ngay sau khi v hon thin, cc mt b tng khng c che bi vn

khun s c bo v trnh mt m:


DTH-2014 Page 15

1. Duy tr vic bo v trong vng ti thiu 7 ngy.

2. Ni mt b tng tip xc vi vn khun c bo dng trong vn khun,

phi gi cho vn khun lun t.

3. Nu vn khun c tho ra trc khi kt thc giai on bo dng, phi

thc hin vic bo dng nh bo dng cho cc b mt khng c vn

khun, s dng vt liu dng h c quy nh trong Mc ny

4. Gi cho b mt b tng khng c vt chn, vt bnh xe trong qu trnh bo

dng.

Dng h bng hi m: Gi cho b mt b tng lun m trong thi gian khng

di 7 ngy vi cc vt liu sau:

1. Nc

2. Lin tc phun nc dng sng

3. Ph bng vt liu ht m nh bao ti gai hoc cc vt liu bo ha nc,

gi cho m lin tc trn b mt b tng.

Dng h cc mt b tng (m sau ny s t vt liu hon thin) bng cc

loi vt liu ph gi m hoc cht dng h b tng th cn phi c nh sn xut

xc nhn l khng nh hng n dnh vi vt liu hon thin sau ny.

1.3.2.5 Th tc th nghim b tng

Trc khi bt u cng vic thi cng, nh thu phi b tr cn b chuyn mn

thch hp thc hin cc th nghim c yu cu bi tiu ch k thut ny cho k s ph

duyt. Nh thu phi trnh i din ch u t ph duyt tn v nng lc ca phng

th nghim hp chun XD-LAS m nh thu d kin s thc hin cc th nghim. Ngoi tr

c ghi ch khc, h phi c cng trng cc thit b sau y, phi c gi trong iu kin

tt xuyn sut hp ng, v l ti sn ca nh thu:

(a) Dng c th nghim.

(b) Dng c th nghim dng cho vic nh gi kh nng lm vic

phi theo Tiu chun Vit Nam hoc tiu chun khc c lin

quan (nu chng khng c cp trong TCVN).

(c) Cc thit b nh du, bo dng, cn mu b tng theo yu cu

ca tiu ch k thut ny, tt c phi tun th tiu chun Vit

Nam hoc tiu chun khc c lin quan (nu chng khng c

cp trong TCVN).


DTH-2014 Page 16

(d) Mt nhit k ti a v ti thiu phi c gi cng trng gn

vi khu vc thi cng o nhit khng kh

(e) Nhit k dng cho o nhit btng v t.

(f) B bo dng mu btng c kim sot nhit .

(g) Thit b ba bt ny th nghim cng b tng, kim nh

bi phng th nghim c lp.

Vic ly mu v th nghim mu btng v thp phi tun theo cc yu cu ca quy

chun xy dng Vit Nam v cc tiu chun Vit Nam lin quan. Vi mi l nh thu phi

thu v lu tr cng trng 1 bn sao giy chng nhn th nghim ca nh sn xut. Nh

thu thi cng c trch nhim mi ch u t ly mu v lp bin bn ly mu vi mi l.

Nh thu phi cp ton b vt liu, thit b v nhn cng cho vic th nghim b tng

ng thi thc hin cc th nghim m Ban qun l d n yu cu hoc ch nh.

Vic th nghim b tng ti v mu th nghim lp phng phi c thc hin theo

TCVN 3118:1993 v TCVN 5574:2012. Tt c cc chi ph th nghim thng thng v th

nghim b sung do bn Ban qun l d n yu cu khi thy rng cng vic thi cng khng

ph hp vi yu cu k thut ny s do nh thu chi tr.

Cng tc kim tra st hoc kim tra h s m cht phi c thc hin theo mt

quy trnh lin tc nu cn thit kim tra ng nht ca b tng.

Mu th nghim lp phng phi l cc khi 150mm c to trong cc khun thp.

Cc cnh ca khun phi bng phng v vung gc vi nhau. Khun c phi kho v chc

chn m bo hnh dng b tng trong mi iu kin. Mu b tng phi c ly ngay ti

im b tng t my trn hoc ti im m Ban qun l d n ch nh. Cc khi ny phi

c v c bo dng theo yu cu ca TCVN 3105:1993.

Tt c cc mu th nghim lp phng phi c nh s th t, nh ch r rng v

khng th ty xo c c th nhn ra tng mu th nghim cho tng v tr v ngy gi c

th. Phi c s ghi chp s th t, tn mu v ngy khun, trm trn b tng, st, kt

qu kim tra b tng bng mt thng v cc thng tin khc nu Ban qun l d n yu cu.

Cc mu th nghim phi c kim tra ti cng mt phng th nghim. Tt c cc th

nghim phi c s chng kin ca Ban qun l d n hoc i din ca Ban qun l d n.

Nh thu phi gi hai bn sao cc kt qu kim tra mu th nghim cho Ban qun l d n

ngay sau khi hon thnh th nghim

Ngoi nhng iu trn, nh thu phi thc hin tt c cc th nghim cn thit hoc


DTH-2014 Page 17

c yu cu bi k s bo m mc chp nhn v cht lng ca cng trnh

1.3.2.6 Mt ngoi ca b tng

B mt b tng s l ra khi hon thin cng trnh th phi c bo v khi b

dnh bn, nhum mu v cc h hi khc.

Khi b mt hon thin khng c ch nh trong bn v th yu cu phi c mt b

mt c chc v lng, khng c l rng v r t ong.

Nh thu phi kim tra tiu ch k thut v bn v ca K s v chng loi/cht

lng ca b mt hon thin yu cu cho cc b phn khc nhau. Nh thu phi ch k

lng n u cn b tng lng mt, t trt, sn hoc cc x l b mt khc theo yu cu

ca K S t vn.

Nu c yu cu c bit v loi hon thin cho b mt b tng n phi c th

hin trong bn v.

Khi b tng, cc b mt ca tm vn khun khng c dnh h hoc b tng

v khe ni vn khun phi c bt kn.

1.3.3 Thi cng b tng cc

Xem trong phn "Tiu ch k thut thi cng cc "

1.3.4. Thi cng b tng i cc, sn y tng hm.

Tin hnh o t, p u cc ca i mng. Sau khi p u cc tin hnh b tng

lt i ging, lp dng ct thp, cp pha v b tng i mng ti ct mch ngng. Tho cp

pha, lp t i mng m cht v gia c nn mng.

Vic thi cng b tng i cc phi m bo cc yu cu sau:

Khng lm sai lch v tr ct thp, v tr ct pha v chiu dy lp btng bo v

ct thp.

Khng dng m di dch chuyn ngang btng trong cp pha;

Btng phi c lin tc cho ti khi hon thnh mt kt cu no theo

quy nh ca thit k.

B tng mng ch c ln lp b tng lt sch trn nn t cng.

st ca b tng i mng l 12 n 14cm. trnh s phn tng, chiu cao ri t do

ca hn hp btng khi khng vt qu l.5m. Khi btng c chiu cao ri t do ln hn

l.5m phi dng mng nghing hoc ng vi voi. Khi dng ng vi voi th ng lch nghing so


DTH-2014 Page 18

vi phng thng ng khng qu 0.25m trn 1m chiu cao, trong mi trng hp phi m

bo on ng di cng thng ng.

Khi dng mng nghing th mng phi kn v nhn. Chiu rng ca mng khng c nh

hn 3-3.5 ln ng knh ht ct liu ln nht. dc ca mng cn m bo hn hp b

tng khng b tc, khng trt nhanh sinh ra hin tng phn tng. Cui mng cn t phu

thng ng hng hn hp btng ri thng ng vo v tr v thng xuyn v sinh sch

va xi mng trong lng mng nghing.

Khi btng phi m bo cc yu cu:

Gim st cht ch hin trng cp pha gio v ct thp trong qu trnh thi

cng x l kp thi nu c s c xy ra;

Mc y hn hp b tng vo cp pha phi ph hp vi s liu tnh ton

cng chu p lc ngang ca cp pha do hn hp btng mi gy ra;

nhng v tr m cu to ct thp v cp pha khng cho php m my mi

c m th cng;

Khi tri ma phi che chn, khng nc ma ri vo btng. Trong trng

hp ngng btng qu thi gian quy nh (bng 18 TCVN 4453:1995)

phi i n khi btng t 25 daN/cm2 mi c tip tc b tng, trc

khi li b tng phi x l lm nhm mt. b tng vo ban m v khi c

sung m phi m bo nh sng ni trn v b tng.

Chiu dy mi lp btng phi khng qu 1.25 ln chiu di phn cng tc

ca m (khong 20cm - 40cm).

Vic m b tng phi m bo cc yu cu sau:

C th dng cc loi m khc nhau, nhng phi m bo sao cho sau khi m,

btng c m cht v khng b r;

Thi gian m ti mi v tr phi m bo cho btng c m k. Du hiu

nhn bit btng c m k l va xi mng ni ln b mt v bt kh

khng cn na;

Khi s dng m di, bc di chuyn ca m khng vt qu 1.5 bn knh

tc dng ca m v phi cm su vo lp btng trc 10cm;


DTH-2014 Page 19

Khi cn m li btng th thi im m thch hp l 1.5 gi - 2 gi sau khi

m ln th nht. Vic m li ch c th c thc hin cho kt cu sn,

khng m li cho i mng.

Cc mu kim tra cng b tng c ly ti ni b tng v c bo dng m

theo TCVN 3105 : 1993. Cc mu th nghim xc nh cng b tng c ly theo tng t,

mi t gm 3 vin mu c ly cng mt lc v cng mt ch theo quy nh ca TCVN

3105 : 1993. Kch thc vin mu chun 150mm x 150mm x 150mm. S lng t mu c

quy nh theo khi lng nh sau: c 100m3 b tng ly mt t mu nhng khng t hn 2 t

mu cho mi ca .

kim tra tnh chng thm nc ca b tng, c 500m3 ly mt t mu nhng nu

khi lng b tng t hn vn ly hai t mu.

Cht lng b tng sau khi phi m bo sc cnh, c chc, ng nht. B mt phi

phng khng b xp r.

Dung sai phi m bo nh hn cc quy nh trong bng 20 - tiu chun TCVN

4453:1995 ng thi phi m bo yu cu sau:

(a) Sai lch cho php hoc lch tm so vi tim tng hoc ct : 2 % chiu rng mng, ti a

l 50mm

(b) Kch thc trn mt bng sai lch cho php khng qu : + 50mm, - 10mm

(c) dy sai lch khng qu : + 10 %, - 5 %

1.3.5 Thi cng b tng ct vch

Trc khi b tng cn lm sch vn khun, ct thp bng cch v sinh v ti nc to

m. m bo cht lng cc yu cu k thut v cp pha, qu trnh b tng phi p ng

ng yu cu nh nu trong bin php thi cng. Bin php b tng ct c th hin trong

bn v. Cc h cp pha phi c c nh bng h thng chng v tng , trn mt sn c

t cc chi tit kin kt vi h chng v tng .

st ca b tng ct vch tng l 12 n 14cm. B tng vch tng hm v b tng cc ct

lin vi vch tng hm s dng bin php chng thm nh ch nh trong thit k. Ti v tr

mch ngng vch b tr bng cn nc rng 20cm. Cc tm cn nc ny phi m bo cht

lng theo quy nh hoc c Nh t vn, ch u t chp thun. Ton b cc tm ngn cn

nc s c ni bng cch hn theo ng khuyn co ca nh sn xut ng thi tt c cc mi

ni phc tp v cc im giao ct c bit cn c nh cung cp gia cng, sn xut.

Khi btng phi m bo cc yu cu:


DTH-2014 Page 20

Gim st cht ch hin trng cp pha gio v ct thp trong qu trnh thi

cng x l kp thi nu c s c xy ra;

Mc y hn hp b tng vo cp pha phi ph hp vi s liu tnh ton

cng chu p lc ngang ca cp pha do hn hp btng mi gy ra;

Cng tc m b tng phi thc hin bng m my

Trong trng hp ngng btng qu thi gian quy nh (bng 18 TCVN

4453:1995) phi i n khi btng t 25 daN/cm2 mi c tip tc b

tng, trc khi li b tng phi x l lm nhm mt. b tng vo ban

m v khi c sung m phi m bo nh sng ni trn v b tng.

Chiu dy mi lp btng phi khng qu 1.25 ln chiu di phn cng tc

ca m (khong 20cm - 40cm).

Khng lm sai lch v tr ct thp, v tr ct pha v chiu dy lp btng bo v

ct thp.

Khng dng dm di dch chuyn ngang btng trong cp pha;

Ct v vch c lin tc t mt sn tng di n y sn tng trn .Vic m b tng

phi m bo cc yu cu sau:

C th dng cc loi m khc nhau, nhng phi m bo sao cho sau khi m,

btng c m cht v khng b r;

Thi gian m ti mi v tr phi m bo cho btng c m k. Du hiu

nhn bit btng c m k l va xi mng ni ln b mt v bt kh

khng cn na;

Khi s dng m di, bc di chuyn ca m khng vt qu 1.5 bn knh

tc dng ca m v phi cm su vo lp btng trc 10cm;






mu cho mi ln .

kim tra tnh chng thm nc ca b tng, c 500m3 ly mt t mu nhng nu

khi lng b tng t hn vn ly hai t mu.


DTH-2014 Page 21


phng khng b xp r.

Dung sai phi m bo nh hn cc quy nh trong bng 20 - tiu chun TCVN

4453:1995 ng thi phi m bo yu cu sau:

(a) Sai lch trn mt bng: 5mm trn tng s 3000mm chiu di, ti a l 25 mm,vi

iu kin khng c b mt no ca cng trnh vt ra khi ng ranh gii.

(b) lch ca trc: 5mm trn 5000mm, ti a l 12mm vi b mt tng, tr, ct.

(c) lch ca ct: 12mm trn 30000mm chiu cao

v tng chu lc: 20mm trn 60000mm chiu cao

1.3.6 Thi cng b tng b nc

Thi cng b tng sn y b lin tc khng mch ngng thi cng nu khng c ch nh

no trn bn v. Gia thnh b v y b b tr mch ngng cao hn ct y b +200mm. Ti v

tr mch ngng b tr bng cn nc c chiu rng theo thit k. Cc tm cn nc ny phi

m bo cht lng theo quy nh hoc c Nh t vn, ch du t chp thun. Ton b cc

tm ngn cn nc s c ni bng cch hn theo ng khuyn co ca nh sn xut ng thi

tt c cc mi ni phc tp v cc im giao ct c bit cn c nh cung cp gia cng, sn

xut.

V chiu dy vch nh v chiu cao khng ln khi b tng dng vi voi lun vo ,

vi voi phi c nhc u ln trnh lm phn tng b tng. Khng vi nhc qu ln mt

b tng.

Tin hnh m vch b tng bng m di. Chiu dy mi lp m


DTH-2014 Page 22

1.3.7 Thi cng b tng dm sn

B tng dm v sn c lin khi, trnh t theo phng php qun chiu t

trong ra ngoi. Nu b tng l loi c dng ph gia ng kt nhanh th hm lng ph gia c

trn ng thit k, thng xuyn kim tra st trc khi , kim tra cng mu th trc

khi t mua b tng thng phm, tin hnh c mu ti hin trng theo quy nh. Thng

xuyn kim tra cng tc bo qun v v sinh, quy cch.

b tng dm v bn sn phi c tin hnh ng thi. Khi dm v cc kt cu

tng t c kch thc ln (chiu cao ln hn 80cm) c th ring tng phn nhng phi b tr

mch ngng thi cng thch hp theo quy nh.

Dm c kch thc ln v lin khi vi bn th mch ngng thi cng b tr cch mt d-

i ca bn t 2cm - 3cm.


phng khng b xp r.

1.3.8 Thi cng b tng cu thang b, lanh t

Cu thang v lanh t l kt cu c thit k l gi ln cc bc tng xy gch, bi vy

khi thi cng b tng cu thang v lanh t cn phi m bo rng ton b tng xy bn di

c thi cng v c kh nng mang ti.

st ca b tng cu thang l t 6 n 8cm.






mu cho mi ln .


phng khng b xp r

Dung sai ca b tng cu thang phi m bo nh hn cc quy nh trong bng 20 - tiu

chun TCVN 4453:1995 ng thi phi m bo yu cu sau:

(a) lch vn ng

Ti cc bc thang: 2mm.

Ti cc v cu thang: 6mm

(b) lch mt bc


DTH-2014 Page 23

Ti cc bc thang: 3mm

Ti cc v cu thang: 6mm.

1.3.3 Chi nh khi thi cng

Chia nh khi thi cng

i vi cc khi b tng c th tch ln th c th chia khi thnh cc phn nh thi cng.

Cc phn ca khi c chia vi kch thc sao cho c mt cnh hoc chiu cao nh hn

2m. Kch thc ny c th ln hn nu kt cu c tnh ct thp phng chng nt cho khi

ln.

1.4 CNG TC CT THP

1.4.1 Tiu chun p dng

TCVN 5574:2012 Kt cu b tng ct thp Tiu chun thit k

TCVN 1651:2008 Thp ct b tng

TCVN 197:2002 Kim loi - Phng php th ko

TCVN 198:2008 Kim loi Phng php th un

TCVN 9390:2012 Thp ct b tng mi ni bng dp p ng Yu cu thit

k thi cng v nghim thu

TCVN 8163:2009 Thp ct b tng Mi ni bng ng ren

TCXDVN 170 :2007 Kt cu thp Tiu chun thi cng lp rp v nghim

thu Yu cu k thut

TCVN 5709:1993 Thp cc bon cn nng dng trong xy dng - Yu cu k

thut

TCVN 6522:1999 Thp cc bon kt cu cn nng

TCVN 313:1985 Kim loi - Phng php th xon

TCVN 312:1984 Kim loi - Phng php th un va p nhit thng

1.4.2 Yu cu chung

Ct thp dng trong kt cu b tng ct thp phi m bo cc yu cu ca thit k,

ng thi ph hp vi tiu chun thit k TCVN 5574 : 2012 v TCVN 1651: 201 .

C hai loi ct thp thng v ct thp cng cao l thp cn nng, tun theo

tiu chun Vit Nam. i vi thp nhp khu cn c cc chng ch k thut km theo v cn ly

mu th nghim kim tra theo TCVN 197: 2002 "Kim loi - Phng php th ko" v TCVN


DTH-2014 Page 24

198 : 1985 "Kim loi - Phng php th un".

Ct thp c th gia cng ti hin trng hoc ti nh my nhng nn m bo mc

c gii ph hp vi khi lng thp tng ng cn gia cng.

Ct thp trc khi gia cng v trc khi b tng cn m bo:

a) B mt sch, khng dnh bn t, du m, khng c vy st v cc lp r;

b) Cc thanh thp b bp, b gim tit din do lm sch hoc do cc nguyn nhn khc

khng vt qu gii hn cho php l 2% ng knh. Nu vt qu gii hn ny th

loi thp c s dng theo din tch tit din thc t cn li;

c) Ct thp cn c ko, un v nn thng.

1.4.2.1 Lu kho v lm sch

Thp phi c xp thnh ng chc chn trong nh c mi che. Trng hp phi

ngoi tri th phi xp nghing cho ro nc. Xp cc tm thp k lt phi c to gc ln

trnh tc ng nc

Thp gia c khi c c nh cn phi sch v khng bm g, vy thp cn, cht bn

gy hi, du m hay sn. Nu dnh du vn khun trn thp th cn c lau ht trc khi

btng. Ct thp r st s khng c s dng.

1.4.2.2 Un thp

Ct v un ct thp ch c thc hin bng cc phng php c hc.

Nh thu phi chun b bn thng k ct thp ct v un ct thp theo chi tit trong

bn v.

Ct thp khng c un hoc lm thng theo cch c th lm h vt liu. Ct thp

khng c t nng.

Khng c php un ln hai cho ct thp c gii hn chy do cao. Trong trng hp

cn phi un ct thp mm c trong b tng, bn knh un trong ca ct thp mm

khng c nh hn hai ln ng knh ca ct thp. Nu ct thp c un ti phn ni chng,

dc un khng c ln hn 1/12.

Mi b ca ct thp phi c th r rng vi thng k v s lng

Ct thp phi c ct un ph hp vi hnh dng, kch thc theo bn v thit k. Sn

phm ct thp ct v un c tin hnh kim tra theo tng l. Mi l gm 100 thanh thp

tng loi ct v un, c mi l ly 5 thanh bt k kim tra. Tr s sai lch khng vt qu

cc gi tr cho bng 4 TCVN 4453 : 1995.


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1.4.2.3 C nh thp

Vic lin kt c nh cc thanh ct thp khi lp dng cn c thc hin theo yu cu

sau:

a) S lng mi ni buc hay hn dnh khng nh hn 50% s im giao nhau theo th t

xen k.

b) Trong mi trng hp, cc gc ca ai thp vi thp chu lc phi buc hoc hn dnh

100%.

1.4.2.4 Ni ct thp

a. Ni buc

Vic ni buc (ni chng ln nhau) i vi cc loi thp c thc hin theo quy nh

ca thit k. Khng ni cc v tr chu lc ln v ch un cong. Trong mt mt ct ngang ca

tit din kt cu khng ni qu 25% din tch tng cng ca mt ct ngang i vi thp trn trn

v khng qu 50% i vi ct thp c g.

Vic ni buc ct thp phi tha mn cc yu cu sau:

a) Chiu di ni buc ca ct thp chu lc trong cc khung v li thp ct thp khng

c nh hn 250mm i vi thp chu ko , khng nh hn 200mm i vi thp chu

nn v khng c nh hn yu cu trong h s thit k. Cc kt cu khc chiu di ni

buc khng nh hn cc tr s bng di y:

b) Khi ni buc, ct thp vng chu ko phi un mc i vi thp trn trn, ct thp c

g khng un mc;

c) Dy buc dng loi dy thp mm c ng knh >1mm;

d) Trong cc mi ni cn buc t nht l 3 v tr ( gia v hai u).

b. Ni bng khp ni (ni cupler)


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Khi khp ni c s dng, nh thu phi cung cp chng loi v c duyt bi

k s gim st. Cc ng ni ct thp phi c s dng mt cch nghim ngt tun theo ti

liu ch dn ca nh ch to, th nghim vt liu v cng tc lp t phi tun th

cc yu cu ca tiu chun TCVN 8163:2009 hoc tng ng. Cc chi tit v cc u ni

c chn la phi c trnh cho k s c s chp thun.

1.4.2.5 Hn thp

Hn ct thp s khng c php khi khng c s chp thn bng vn bn ca T

vn thit k.

1.4.2.6 Th nghim ct thp

Ly mu v th nghim ct thp

Mi m thp c giao ti cng trng s c ly mu v th nghim theo Tiu

chun Vit Nam.

Th nghim thp s c tin hnh do 1 phng th nghim XD-LAS c duyt

thc hin. Nh thu s trnh cho k s t vn v c s chp thun v cc chi tit, nh

giy chng nhn ca XD-LAS, lai th nghim c XD-LAS thng qua v cng trnh tham

kho v.v ca phng th nghim c chn.

Bo co th nghim theo yu cu phi c np cho k s. Nh thu phi bo m

rng cc th nghim tun th tiu chun xy dng Vit Nam lin quan (c th gm cc tiu

chun b sung c sa i bi c quan nh nc trong sut qu trnh hp ng).

Th nghim ng ni ct thp

Th nghim vt liu v cng tc lp t phi tun th cc yu cu ca tiu chun

TCVN 8163:2009 hoc tng ng. Cc kt qu th nghim s trnh cho k s lu tr.

Mu v Th nghim neo/ thp khoan cy

Cc neo/ thp khoan cy phi c th nghim ko bi mt phng th nghim c

lp, c duyt v d nh cc th nghim thng qua XD-LAS (Vit Nam). S lng mu th

ti thiu s l khng nh hn cc tr s: 3% tng s mu, 2 mu v tiu ch k thut ca nh

cung cp cho tng dng v kch thc ca Neo/Thp khoan cy. V tr ca mu th s c

la chn bi K s gim st. Vi mi mu khng t yu cu do chu ko, s tin hnh th

thm 2 mu, lin tc quy trnh nh vy cho n khi t kt qu yu cu. Cc Neo/Thp khoan

cy s c thi cng b sung thay cho cc v t khng t. Ti th nghim ly bng gi tr ng

vi gii hn chy do ca thp v s c gi ti thiu 5 pht, v s l 1 gi i vi trng

hp cng xn. Tt c cc bin php khoan neo cho kt cu cng xn khng cho php tin hnh


DTH-2014 Page 27

tr khi c s chp thun cho php khc.

1.4.3 Thi cng ct thp i, ging mng

i vi mng c kch thc ln, khi lng b tng ln cn c thp bin php lm

gim co ngt, chu ng sut nhit trong b tng. Ngoi ra cn ch thp bin php ti cc v

tr mt i ging v sn tng hm thi cng sau.

Ct thp ch ti v tr mch ngng cn c bin php bo v chng gy gp, r st

1.4.4 Thi cng ct thp ct

Trc khi lm thp ct cn kim tra cc trc nh v ct theo cc chiu ngang, dc v

nh du bng sn ln tng hoc sn.

Thi cng lp dng ct thp ct c th s dng th cng, kt hp vi cn cu dng

treo thp trong khi c nh, buc v c nh ct i. Trc khi lp t ct thp cn phi dng

cc thit b trc c nh v sn tim, mc , vch xung nn b tng. Sau khi c nh bng

buc, iu chnh ct thp ch cho ng kch thc theo thit k ri mi buc ct ai. Sau khi

lp t ct thp cho tng cu kin ct nh, thu s li s dng thit b trc c kim tra li

v tr, tim ct, mp ct trc khi nghim thu.

Trong khi thi cng lp dng ct thp ct phi s dng gio lm sn thao tc. Chn

gio phi c neo vo sn. Sn thao tc phi chc chn, phi c lan can an ton cng

nhn c ch ng v ta vng chc trong khi thi cng.

Buc cc du thp ch lin kt gia ct v tng theo thit k.

Ct thp ct l ct thp theo phng ng, hn na chiu cao ca thanh thp l ln

nn trong qu trnh thi cng lp dng ct thp ct cn c bin php c nh ct thp theo

phng ng.

1.4.5 Thi cng ct thp dm

Thi cng ct thp dm: v c chiu di v kch thc dm ln do phi kt hp gia

cng lp dng thnh khung trc sau dng cn cu cu ng v tr, gia cng tip cc phn

ti ng v tr ca dm.

Cu thp ln ng v tr thi cng. S dng h sn cng gia cng nh hnh k

thp chnh ca dm, sau lng ct ai c gia cng sn vo, nh v tm mt vi v tr

chnh ca ct ai ri tin hnh buc ct thp ai vo ct thp ch.

Khi hon thnh khung chnh ca ct thp dm mi tin hnh buc con k. Vic

buc con k b tng phi tho mn chiu dy lp b tng bo v nu trn v phi m

ba chiu dy lp b tng bo v l u . Con k phi c buc cng v khng dch chuyn.


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Sau khi hon thnh qu trnh lp dng cn kim tra k li cc v tr ni buc, khong

cch cc con k m bo chiu dy lp bo v b tng.

1.4.6 Thi cng ct thp sn, thang b

Thi cng lp thp di sn: Vic lp dng lp thp di hon ton tun theo thit k

v theo TCVN 4453-95.

S dng con k b tng vi li 600x600mm m bo thp sn khng b x st

xung sn cp pha.

Trong qu trnh thi cng buc thp, do si thp di khi vn chuyn c th lm x lch

cc v tr ca ct thp hoc con k. Nh thu s t chc lp ct thp theo kiu cun chiu v

theo tng hng. Trnh vic vn chuyn hoc i li ln trn cc v tr lp dng ct thp.

Khi thi cng lp thp trn, nh thu s c bit ch n con k to khong cch v

mi lin kt gia hai lp ct thp. Nh thu s dng loi con k thp u c un cong

trnh m trc tip xung vn khun sn

Trong khi thi cng lp thp trn, nh thu s phi hp cht ch vi cc nh thu thi

cng in nc, cng ngh t sn cc chi tit ngm trong b tng.

Thi cng thp sn theo kiu cun chiu t xa ti gn trnh i li, vn chuyn ct thp

chng cho, gy x lch v tr ct thp lp dng.

1.4.7 Thi cng ct thp tng (vch)

Ct thp tng l ct thp theo phng ng nn rt kh thi cng. Khi thi cng cn

b tr tng nhm th t 5 n 7 ngi d phi hp .

Khi lp dng ct thp, trc tin c th lp dng s b tng khung vung trc

(Kch thc tng c th ly bng chiu di thanh thp). (i vi lng thang my th c th

dng h khung chnh ti cc gc ca lng thang my). Sau dng ct chng bng thp,

chng tm h khung cng theo phng ng ri tip tc lp thp an.

Khi an thp theo li, dng cc thp D12 ct sn bng chiu dy bn tng

buc neo gia hai li thp. Khong cch gia cc neo


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TCVN 1075 : 1971 G x - Kch thc c bn

TCXD 269:2004 Dn gio Cc yu cu v an ton

1.5.2 Cc yu cu chung

1.5.2.1 Chun b vn khun trc khi b tng

a. Tng qut

Trc khi cng tc thi cng vn khun bt u nh thu phi trnh np chi tit ca h

thng vn khun d kin s dng cho tt c cc cu kin chnh cho k s gim st v phi

c ph duyt ca k s bng vn bn trc khi bt u lp t.

Vn khun phi kn khng lm mt va hoc h trong b tng. Vn khun b

tng ti ch phi c lm bng g kh, g dn chng thm, thp hoc cc vt liu khc

c Ban qun l d n thng qua.

Chiu dy ca g tm khng di 25mm v ca g dn khng di 20mm, ng thi

cc mp g dn phi c trm kn nhm trnh m. Vn khun thp phi c lm bng thp

tm, c dng mt cch ph hp v c lm cng ti cc gc, khuu v/hoc cc mt

phng.

Nh thu c trch nhim thit k gin gio chng vn khun, cc b phn

kt cu s c c v cc ti trng thi cng khi b tng c cha pht huy cng .

Khng di 3 tun trc khi cng tc gin gio bt u, nh thu phi np cho k s gim st

v phi c ph duyt ca k s bng vn bn cc ti liu: Bin php thi cng; bng tnh v

cu to chi tit ca h thng gin gio cho tt c cc kt cu chu lc chnh . Bin php thi

cng phi bao gm mt bng ca vn khun v gin gio, chi tit cy chng, ngha l kh

nng chu lc, lin kt v chi tit ging vi d kin trng lng b tng, v qui trnh tho g.

Nh thu phi chu trch nhim thit k, cung cp, thi cng, tho g v an ton ca

gin gio.

Nh thu phi ch nh mt k s kim tra c lp kim tra v chng nhn thit

k trc khi np cho k s. Nng lc ca k s kim tra c lp phi uc i din ch u t

ph duyt.

b. Thit k vn khun

Vn khun yu cu phi gm tt c cc dng tm thi hoc c nh to thnh b

tng, bao gm cc thanh chng gi khun, thanh ngang, vch, ging v ai kp m bo

hnh dng khun v dung sai quy nh.

Vn khun phi c thit k bi nh thu trng lng hoc p lc b tng t


DTH-2014 Page 30

vi dung sai quy nh i vi cc thit b, cc tc ng va chm v rung. Vn khun phi

c thit k sao cho c th n gin ho khu lp dng v tho d, cho php iu chnh sau

khi lp dng v lm v sinh trc khi b tng, ng thi vn gi nguyn thanh chng ti

v tr quy nh khi d b vn khun.

Cc thanh vng, thanh chng phi c lp t theo cc phng ngang, dc v trn

mt phng nm ngang.

Vic iu chnh vn khun theo chiu cao b tng c thc hin bi cc kch v

nm, cho php to vng ngc khi cn thit v h dn vn khun trong qu trnh b

tng

Bn v shop drawings th hin cc chi tit vn khun v cc chi tit khc cng nh bn tnh

phi c gi cho Ban qun l d n lu. Bn v shop drawings th hin chiu cao vn

khun cho b tng phi c gi cho Ban qun l d n ph duyt v cc kiu mi lin kt

c. L, vt chn v chi tit lp t

Yu cu v kch thc, chng loi v v tr ca tt c l, vt chn hoc chi tit lp

t ca nh thu hay nh thu ph phi c ph duyt trc khi thc hin.

Ngoi tr c qui nh hoc ph duyt no khc, tt c cc l xuyn kt cu chu

lc phi c khun, v tt c vt chn, chi tit lp t phi c lp lc b tng.

Khng c khoan hoc ct bt c phn b tng no m khng c ph duyt trc

ca k s gim st.

d. Hp cht tho vn khun

Hp cht chng dnh tho vn khun l loi c sn th trng v l mt trong

cc loi sau y:

Cht nh tng;

Du nguyn cht c cha cht hot tnh b mt ;

Hp cht tho Vn Khun phi c lu tr v s dng mt cch cht ch theo

hng dn bng vn bn ca nh sn xut.

e. V sinh vn khun

Tt c cn b bn trong vn khun phi c v sinh trc khi b tng. Vn

khun tip xc vi b tng phi c v sinh v x l bng hp cht tho vn khun c

duyt.

f. vng


DTH-2014 Page 31

Tt c vn khun cho sn v dm phi c thi cng sao cho vng qui nh

trong bn v v phi t trc khi b tng.

Nh thu phi kim tra vng qui nh bo m ph hp vi bin php v thi

gian tho g vn khun, gin gio. Nh thu phi chu trch nhim bo m sai s ca kt

cu hon thin trong phm vi qui nh, v ph hp cho cc b phn khc m hoc nh thu

ph sau s lm.

Cp pha vm v dm vi khu ln hn 4m phi c thit k c vng thi

cng.

g. cng ca vn khun

Vn khun phi c cng khng lm h b mt b tng do chuyn v qu

ln ca vn khun trong lc m.

h. Sa cha vn khun

Vn khun b h khng c s dng nu theo k s gim st vic sa cha

lm nh hng n b mt ca b tng.

i. Thit k vn khun ph hp vi phng php tho g

Nu cy chng c li khi tho g vn y th vn y phi c thit k sao cho

cy chng khng b nh hng trong qu trnh tho g vn y. Nh thu phi np cho

k s gim st ph duyt bin php tho g vn khun.

k. Ph b mt vn

Khi c yu cu v c ph duyt, cht ph b mt s c ph trn b mt kh

v khng c bi, du m v cc tp cht khc. Trc khi ph, b mt phi c ch bng

giy nhm loi b ch li hoc lm phng nhng khu vc li lm. Cc l, ch lm phi

c trm bng cht chng thm. Phi tun th hng dn ca nh sn xut cht ph v

phng php thi cng mt cch chnh xc v cng vic phi c thc hin bi mt th sn

lnh ngh.

Bt k c tip xc vi b tng hay khng, tt c b mt vn khun phi c ph, cc

cnh v khe ni k c nhng l khoan cng phi c ph.

1.5.2.2 Kim tra v nghim thu

Cp pha v gio khi lp dng xong c kim tra theo cc yu cu

Vic nghim thu cng tc lp dng ct pha gio c tin hnh ti hin trng, kt hp

vi vic nh gi xem xt kt qu kim tra theo quy nh bng 1 v cc sai lch khng

vt qu cc tr s ghi trong bng 2.


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Bng 2- Sai lch cho php i vi cp pha, gio.

1.5.2.3 Tho d vn khun

a. Tng qut

Trc khi tho d vn khun, nh thu phi bo m rng b tng t

cng cho qu trnh tho d. Kt cu khng c bin dng, h hi hay qu ti trong bt k

trng hp no do vic tho d vn khun.

Cp pha gio ch c tho d khi b tng t cng cn thit kt cu

chu c trng lng bn thn v cc ti trng tc ng khc trong giai on thi cng

sau. Khi tho d ct pha, gio, cn trch khng gy ng sut t ngt hoc va trm

mnh lm h hi n kt cu b tng.

b. Bin php tho d

Nh thu phi trnh bin php thi cng cho vic tho d gin gio v vn khun

k s gim st chp thun. Nhng bin php ny phi ph hp vi nhng yu cu ca

thit k v bin php thi cng cho gin gio v vn khun.

c. Thi gian tho d ti thiu


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Thi gian ti thiu trc khi tho d vn khun c xc nh bng mt trong hai

cch (A) v (B) di y tr khi c quy nh khc. K s c th chp thun vic

tho d vn khun sm hn (nhng khng phi ct chng) nu nh thu c th

chng minh rng n c th c thc hin m khng gy h hi cho b tng.

(A) Thi gian tho d ti thiu c lit k bng trn y:

Bin php ca nh thu v o nhit b mt ca b tng phi c chp thun. Thi gian

quy nh cho tho d mt di ca vn khun v ct chng ti 7C s c cng thm

na ngy cho mi ngy tnh vi nhit nh nht ca b tng trong khong 2C v 7C.

Cc ngy c nhit thp hn 2C s khng c tnh vo.

(B) Nh thu c th xc nh thi gian tho d t cng b tng theo yu cu ca

TCVN 4453:1995.

Bt k nhng iu nu trn, cy chng vn khun phi c gi nguyn v tr ti

thiu 3 ngy.


DTH-2014 Page 34

Phn 2

TIU CH K THUT

CC CNG TC T

- I CC, GING MNG, V TNG HM.

1.0 CC IU KIN CHUNG

Bt c cng tc o no cng phi c tin hnh t cao trnh mt t hin hu,

theo kho st hin trng do Chuyn vin Kho st c cp giy php thc hin

theo bn v v ch dn ca K s t vn.

2.0 VING THM CNG TRNG

2.1 Nh thu cn ving thm cng trng v lm quen vi iu kin hin hu ti

cng trng v nht l s gn gi ca khu nh dn k cn hoc cc vn khc

c th lm nh hng n cng tc thi cng.

2.2 Nh thu phi d phng cho tt c cc cng trnh tm cn thit (h thng cp

pha/ chng ) cho d c cp hay khng cp phc v cc cng

vic hay cc cng tc o k cn. Cc h th s c tin hnh bt c khi no v

bt c ch no cn thit.

2.3 Phi tin hnh tt c cc bin php phng nga cn thit, k c bt c phng

php kim tra no trnh tnh trng thit hi cho khu vc dn c hin hu.

2.4 Nh thu c xem nh chc chn v tnh cht ca t, loi vt liu s o,

bin php di di vt liu d tha sau khi o ra khi cng trng, loi thit b

ph hp cng nh s ch lm vic sn c ti hin trng.

2.5 Bt c khiu ni no ca Nh thu v vic thiu kin thc v iu kin cng

trng s khng c cu xt.

3.0 CNG TRNH TM

3.1 Nh thu phi t chu trch nhim v vic thit k, thi cng, bo dng v di

di ton b cc cng trnh tm, bao gm cng tc g, sn g, h thng chng

v thanh ging. Nh thu phi thu K s chuyn ngnh thit k v xc

nhn cc cng trnh tm ny, bao gm vic chun b ton b cc bn v thi

cng sau cng cng nh cc chnh sa cho cc cng trnh vnh cu b nh

hng bi cng trnh tm v xin ph duyt ca c quan chnh quyn hu quan.

3.2 Nh thu phi trnh np, trc khi bt u cng vic, ton b bn v v

thuyt minh thit k ca cng trnh tm lu h s.


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3.3 Nu K s t vn xt thy cn thit, c th ch dn Nh thu cung cp thm h

thng chng cho cng tc o, ton b chi ph cho cng tc ny s do Nh

thu chu. Bt c ch dn no nh th cng s khng lm gim trch nhim ca

Nh thu v tnh thch hp ca h thng chng .

4.0 H THNG THOT NC TM BN NGOI PHM VI CNG TRUNG

Mng li thot nc tm thi, k c h bn, phi do Nh thu cung cp thot

nc cng trng v kim sot bn khng cho chy vo khu vc dn c k cn. H

thng thot nc phi tun theo cc yu cu hin hu ca cc cp c thm quyn.

Nh thu phi xin ph duyt cn thit v thanh ton ton b chi ph c lin quan.

Cc xut cho h thng thot nc tm bn ngoi phm vi cng trng phi

c trnh cho K s t vn xem xt trc khi bt u tin hnh cng vic v

vic xem xt ca K s t vn s khng lm gim trch nhim ca Nh thu.

5.0 CNG TC O

5.1 Cng tc o cho vic gim cao , phn , mng ng, cng rnh, knh v

ng nc, v.v phi c thc hin theo kch thc, su hoc cao trnh

c th hin trn bn v. Nu o

qu kch thc, su hoc cao trnh trn bn v hoc ch dn ca K s t

vn, th Nh thu phi lp li bng b tng hn hp mc thp hoc bng vt

liu c K s t vn chp thun vi chi ph ca Nh thu n khi t c s

chp thun ca K s t vn.

5.2 Ton b cng tc o phi c tin hnh mt cch kho lo theo hng, cao

v loi c nu trn bn v.

5.3 Trnh t ca phng php o c s dng phi c s chp thun ca K s t

vn.

5.4 Hng o cho tng mng khng c nh hn 50mm so vi mt di ca mng.

5.5 y ca h o phi c gi khng b vy bn v nc bng cch bm hoc

cc bin php khc c K s t vn chp thun. Nhng phn o mm hoc

b li phi c ct b v lp li bng b tng hn hp mc thp.

5.6 y ca phn o tip nhn b tng hn hp mc thp phi c lm phng,

ti nc v m cht bng cc phng tin c gii c duyt t c s

chp thun ca K s t vn.

5.7 y ca phn o cho phn mng m rng phi c kim tra v chp thun

bi K s t vn. Phn nn mng (bearing strata) phi c bo v bng cch

ph mt lp b tng mc thp vi dy ti thiu vo ngay trong ngy.


DTH-2014 Page 36

5.8 Cc cnh ca phn o phi c chng ph hp trnh tnh trng trn

trt hoc ln xung, ng thi phi c p kn khi cn thit trnh tnh

trng ln ln ca ct, bn, v.v

5.9 Cn lu trnh gy thit hi cho h thng cng rnh, gaz, nc, c hoc

mi. Nu c tnh trng thit hi, K s t vn hoc i din ca mnh cng

nh c quan chc nng (nu c th) phi thng bo ngay v Nh thu phi khc

phc thit hi bng chi ph ca mnh.

5.10 Khng c lp hoc che ph bng b tng ln phn o cho mng hoc

mng cho n khi Nh thu thng bo cho K s t vn rng cng tc o

sn sng cho vic kim tra v nhn c s chp thun ca K s t vn tin

hnh cng vic.

5.11 Nh thu phi lu trn bn v su ca mi phn o, ng thi bn v

khi hon thnh phi c trnh np cho K s t vn.

5.12 Nu Nh thu gp phi nhng tr ngi nh sn b tng ct thp, trn mt

t, mng, cc thp hoc b tng ct thp th phi trnh cho K s t vn

ph duyt trc khi di di. Nh thu phi bao gm trong gi thnh trn gi

ca mnh ton b chi ph cho vic ph d hoc di di nhng nhng tr ngi .

5.13 Nh thu phi bo v cc h thng k thut hin hu bn trn hoc bn di

ng thi bo v cho cc khu vc dn c k cn khng b thit hi do vic thi

cng cng trnh.

5.14 Nh thu phi dn xp cho vic di di v d b bt c tin ch no gy cn tr

theo hng dn ca K s t vn.

5.15 Bt c thit hi no gy ra cho cc h thng k thut hin hu cng nh cc

khu vc dn c k cn phi c Nh thu khc phc bng chi ph ca mnh.

6.0 CNG TC LP T

6.1 Ch tin hnh lp cng tc o sau khi cc cng vic vnh cu c chp

thun v sau khi ly ht cc ph liu thi cng khi khu vc o.

6.2 Loi vt liu c chn t cc vt liu c o thng s dng cho cng

tc lp t. Nh thu phi cung cp cho K s t vn ph duyt cc thng tin chi

tit v quy trnh lp t ph hp vi k hoch m Nh thu d kin s dng.

Quy trnh ny phi m nn t c 95% cht kh ti a nh quy nh

trong Phn th nghim trn bng 30 ca TCVN 4447 1987. Khng c c

trng hp no dy lp m nn vt qu 300mm truc khi tin hnh m nn.


DTH-2014 Page 37

6.3 Cng tc lp li hoc lp t vo phn tng chn b tng phi c tin hnh

bng loi ct v si loi tt cng, c bn cao c chp thun.

6.4 Khng c lp t cho n khi tng chn b tng c chng bng h

thng chng v c x l y gia tng cng chu lc do vic lp

t.

6.5 Trc khi tin hnh lp t, ton b vn khun phi c d b khi tng

chn cng nh rc v cc vt liu khng ph hp phi c dn sch khi khu

vc o.

6.6 Khi s dng phng php m nn c hc, dy m nn ca tng lp vt

liu khng qu 200mm v khi m nn bng tay th dy khng qu 150mm.

6.7 My m nn khng c hot ng trong vng 600mm tng kt cu m

khng c s chp thun ca K s t vn.

6.8 Tiu chun xy dng Vit nam TCVN 447-1987 s c s dng nh quy phm

cho thi cng v nghim thu.

7.0 CNG TC THI B

7.1 Vt liu o b d tha phi c di di khi cng trng theo cch K s t vn

chp thun.

7.2 Nh thu phi tin hnh mi bin php phng nga cn thit trnh tnh trng

ri vi hoc vy bn trn ng trong qu trnh di chyn t.

8.0 H THNG THOT NC

Nh thu phi bo dng ton b cng tc o khng b thot nc t bt c ngun

no vo mi thi im. khng c ng nc vo bt c thi im no. Nh thu

phi cung cp my bm cng vi ton b my bm d phng cn thit m

bo bm nc vo mi thi im. Nh thu phi d phng cho vic to b mt o

dc, knh nc b mt tm thi cng nh h nc thi c phn nh v phn y

cng tc o thot nc khi khu vc cng trung v ngn chn tnh trng xi

mn hoc thit hi c th xy ra. Nu theo kin ca K s t vn tnh trng n nh

ca dc c o gy nh hng ngc li do vic ngn nc hoc tnh trng

xi mn, Nh thu phi tin hnh cc bin php khc phc theo ch dn ca K s t

vn bng chi ph ca mnh.

9.0 PHN NN CNG

Nn cng khi c lu , phi l loi cng, kh, gch, b tng, khi hoc vt liu

cng khc c K s t vn chp thun c kch c ti a dy 50mm c m

cht theo lp vi dy khng qu 150mm. B mt phi c v thm nc tt.


DTH-2014 Page 38

10.0 CNG TC BO V

10.1 Khng k cc iu cp trc y trong Ch nh k thut ny lin quan

n h thng chng cho cng tc t v thot nc cho cng trng, Nh thu cn

d phng cho vic bo v thch

hp cng tc o bao gm ton b cc ba-ri-e, tay vn lan can v bng c chn.

10.2 Khi cng tc o din ra gn ranh gii cng trng m l li vo ca c dn

hoc cc ch h k cn phi c ro quanh bng ba-ri-e bo v v ngn chn

tnh trng xm nhp bt hp php.

11.0 GI H O C KH RO

11.1 Nh thu phi c trch nhim gi cng tc o c kh ro cho bt c ci g

gy ra tnh trng tri ln ng thi phi cung cp cng sut cho my bm cng

nh cc cng trnh tm khi cn thit cho mc ch ny.

11.2 Nh thu phi hon thin bng chi ph ca mnh bt c thit hi no c th gy

ra do khng gi cho cng tc o c kh ro.

12.0 LI VO V CNG TRNH TM

12.1 Nh thu phi xut, to ra v bo dng ton b ng x, ram dc cng nh

li i cn thit c li ra vo chu c mi thi tit ng thi phc hi li

nguyn trng khu vc thi cng cng nh ton b cng trnh b thit hi khi hon

thnh Hp ng t c s hi lng ca K s t vn. Nh thu phi xin ph

duyt li bng qua tm thi cc cng rnh hin hu nu cn thit cho

Cng trng.

12.2 Mt bng b tr ng, ram dc v li i xut phi c trnh cho K s

t vn ph duyt trc khi bt u tin hnh cng vic. ng, ram dc v li i

xut ny phi c dc hn 1/7. K s t vn c th a ra ch th cho Nh

thu lin quan n mt bng b tr cng nh phng php thi cng ng, ram

dc v li i tm thi ng thi Nh thu phi tun theo cc ch th ny m

khng c i thm chi ph.

12.3 Nh thu phi chu trch nhim v ton b cng trnh, dc, ram dc, li i tm

thi trong sut thi gian thc hin Cng trnh.

13.0 VN CHUYN VT LIU

Nh thu phi lu n vic cht d vt liu cho cng trnh, ng x v va h

khng b cn tr hoc gy cn tr giao thng theo Quy nh ca Cng an v vic

vn chuyn, cht d ton b vt t, my mc, t, rc, v.v... n v i khi khu vc

cng trng.


DTH-2014 Page 39

14.0 TH NGHIM M NN

14.1 Gi tr c trng:

m nn tng ng c nh ngha l t l gia kh khu vc v kh

ti a t c trong th nghim m nn theo tiu chun hoc c iu

chnh n mc ph hp theo t l phn trm.

Gi tr c trng ca m nn tng ng s c tnh l X - 0.92S cho 6

th nghim / lot trong X v S tng ng l gi tr trung bnh v lch tiu

chun ca gi tr m nn tng ng ring cho 1 lot.

lch tiu chun ca gi tr th nghim m nn tng ng c nh ngha bng:

n (X

x )2

S2 = i=1 n

1

Trong x, i = 1,2,3,......n, l gi tr th nghim m nn tng ng ring v

n l s ln th nghim cho mi lot.

14.2 Phng php th nghim

Th nghim m nn c tin hnh theo tiu chun TCVN 4447: 1987.

Nh thu c th trnh xut th nghim bng phng php th nghim

bng ht nhn cho K s t vn ph duyt, tuy nhin ph duyt phi c

K s t vn ph duyt ton b. a im hoc thi gian th nghim phi

c la chn ngu nhin.

14.3 S ln th nghim

Theo hng dn chung, th nghim m nn s c tin hnh theo t l.

Mt ln th nghim / 700m / lp vt liu cho ton b cng tc t, nha

ng v lp gch va h.

K s t vn c th thay i s ln th nghim theo mnh nhng khng c

php khiu ni v khon thanh ton thi gian b sung.

2

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