TIU CHUN VIT NAM - TIU CHUN XY DNG

TCVN 9115:2012

KT CU B TNG V B

TNG CT THP LP

GHP -THI CNG V

NGHIM THU

TIU CHUN: TCVN 9115:2012

KT CU B TNG V B TNG CT THP

LP GHP -THI CNG V NGHIM THU

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TIU CHUN QUC GIA

TCVN 9115 : 2012

KT CU B TNG V B TNG CT THP LP GHP -THI CNG V NGHIM THU

Assembled concrete and reinforced concrete structures - Practice for erection and acceptance

Li ni u

TCVN 9115 : 2012 c chuyn i t TCXDVN 390 : 2007 theo quy nh ti khon 1 iu 69 ca Lut Tiu chun v Quy chun k thut v im a khon 1 iu 7 Ngh nh s 127/2007/N-CP ngy 01/8/2007 ca Chnh ph quy nh chi tit thi hnh mt s iu ca Lut Tiu chun v Quy chun k thut.

Tiu chun ny thay th tiu chun "TCVN 4452 : 1987 Kt cu b tng v b tng ct thp lp ghp - Quy phm thi cng v nghim thu".

TCVN 9115 : 2012 do Hi Cng nghip B tng Vit Nam bin son, B Xy dng ngh, Tng cc Tiu chun o lng Cht lng thm nh, B Khoa hc v Cng ngh cng b.

KT CU B TNG V B TNG CT THP LP GHP -THI CNG V NGHIM THU

Assembled concrete and reinforced concrete structures - Practice for erection and acceptance

1. Phm vi p d ng

Tiu chun ny quy nh cc yu cu i vi cng tc thi cng, an ton lao ng, kim tra v nghim thu kt cu lp ghp t cu kin b tng, b tng ct thp thng v b tng ct thp ng lc cng trc (gi tt l cu kin b tng) trong xy dng cc cng trnh dn dng v cng nghip.

2. Ti li u vi n dn

Cc ti liu vin dn sau y l cn thit khi p dng tiu chun ny. i vi cc ti liu vin dn ghi nm cng b th p dng bn c nu. i vi cc ti liu vin dn khng ghi nm cng b th p dng phin bn mi nht, bao gm cc bn sa i, b sung (nu c).

TCVN 1651 : 2008, Thp ct b tng cn nng.

TCVN 2682 : 2009, Xi mng poc lng - Yu cu k thut.

TCVN 3146 : 1986, Cng tc hn in - Yu cu chung v an ton.

TCVN 4055 : 1995, T chc thi cng.

TCVN 4086 : 1985, An ton in trong xy dng.

TCVN 4244 : 2005, Quy phm k thut an ton thit b nng.

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

TCVN 4506, Nc trn cho b tng v va - Yu cu k thut.

TCVN 5308 : 1991, Quy phm k thut an ton trong xy dng.

TCVN 6260 : 2009, Xi mng poc lng hn hp - Yu cu k thut.

TCVN 6700-1 : 2000 (ISO 9606-1 : 1994), Kim tra chp nhn th hn - Hn nng chy - Phn 1: Thp.

TCVN 6834-2 : 2001 (ISO 9956-2 : 1995), c tnh k thut v s chp nhn cc quy trnh hn vt liu kim loi - Phn 2: c tnh k thut quy trnh hn h quang.

TCVN 7570 : 2006, Ct liu cho b tng v va - Yu cu k thut.

TCVN 8826 : 2011, Ph gia ha hc cho b tng.

TCXD 258 : 2001 *, Hn hp va xi mng t chy khng co - Yu cu k thut v phng php th.

3. Thut ng v nh ngh a

Tiu chun ny s dng cc thut ng v nh ngha sau:

3.1

Cu ki n (Member)

Nhng sn phm b tng, b tng ct thp hoc b tng ng lc trc c sn, khi lp ghp li s hp thnh mt kt cu cng trnh.

3.2

Cu ki n b tng ng lc cng tr c (Prestressed concrete member)

Cu kin b tng c gy ng sut nn trc bng cng ngh cng trc ct thp trn b c tr neo ri sau mi b tng.

3.3

Va khng co (Non-shrinkage mortar)

Va xi mng vi ct liu t nhin v ph gia ph hp c linh ng cao, pht trin cng nhanh v khng co ngt trong qu trnh ng rn, dng chn cc mi ni lin kt trong kt cu b tng v chn b my.

3.4

Mi ni (Joint)

B phn lin kt cc cu kin sau khi lp ghp bng va khng co, b tng ct thp ti ch hoc bng mi hn.

4. Yu cu i vi cng tc thi cng k t cu b tng l p ghp

4.1 Quy nh chung

4.1.1 Cng tc lp ghp cu kin b tng phi do cc t chc chuyn mn ha v cng tc ny thc hin.

4.1.2 Trc khi thi cng lp ghp cu kin b tng, n v thi cng phi lp "Bin php t chc thi cng", lp bn v thit k lp ghp v c c quan c thm quyn ph duyt.

4.1.3 Trong "Bin php t chc thi cng" lp ghp cu kin b tng c sn, cn c ni dung sau:

- Chn phng tin cu lp ph hp;

- Trnh t lp ghp cu kin;

- Nhng bin php bo m chnh xc lp ghp;

- Bo m cng ca kt cu v khng bin dng trong qu trnh lp ghp cu kin hoc t hp cu kin vo v tr thit k, cng nh m bo bn vng v n nh ca ton b cng trnh;

- C bin php m bo thi cng xen k gia lp cu kin v lp cc thit b cng ngh v thit b k thut v sinh, thng gi, ..v.v..

- Bo m s ng b ca qu trnh lp ghp. * Cc TCXD s c chuyn i sang TCVN

4.1.4 Khi chn cc loi cn trc, my, thit b lp ghp cng trnh, cn tun theo bin php k thut thi cng v bin php t chc thi cng lp v ch n nhng vn sau:

- Kch thc, khi lng kt cu;

- Hnh dng, kch thc cng trnh;

- c im ca khu vc lp ghp.

4.1.5 Trong iu kin cho php nn c gii php c gii ha ng b dy chuyn cng ngh lp ghp t khu vn chuyn, xp d cho n khu lp t cu kin vo v tr thit k.

Nn s dng cc thit b g lp v cc phng tin c gii nh, cc cng c cm tay c nng sut cao nhm gim lao ng th cng trong lp ghp v hon thin cng trnh.

4.1.6 Trc khi lp ghp cng trnh, phi hon thnh cc cng tc chun b gm mt s hoc ton b cc vn sau:

- Lm ng tm phc v thi cng. ng m bo khng ln, ly, trn trt v phi m bo thi cng lin tc;

- Lm kho, ln, sn bi cnh cng trnh, trang b cc b g xp d cu kin trong phm vi hot ng ca cu trc;

- Kim tra, hiu chnh my mc, thit b lp ghp v b tr ng v tr xc nh trong dy chuyn cng ngh ca thit k t chc thi cng;

- Lp t, kim tra gio, tr v gi phc v thi cng;

- Kim tra cc bin php m bo an ton lao ng.

4.1.7 Nn tin hnh lp ghp cu kin ly trc tip t phng tin vn chuyn. Khi khng c iu kin th c th xp cu kin ti cc kho bi trn cng trng nhng cn ch n trnh t theo bin php lp ghp.

4.1.8 m bo cht lng cng tc lp ghp cu kin b tng c sn, phi tin hnh kim tra trong tt c cc cng on ca qu trnh lp ghp theo quy nh ca TCVN 4055 : 1995 v cc tiu chun, quy nh hin hnh v qun l cht lng cng trnh xy dng.

4.2 Vn chuy n, k xp, nghi m thu c u ki n ti cng tr ng

4.2.1 Cc cu kin b tng c sn chuyn n cng trng phi ph hp vi thit k v cc tiu chun quc gia (TCVN) hin hnh v loi sn phm ny. i vi nhng sn phm cha c trong TCVN c th p dng cc tiu chun quc t hoc tiu chun nc ngoi, ng thi phi ph hp nhng yu cu k thut do thit k quy nh.

Khng chp nhn cc cu kin c sn khng c chng ch v khng c du kim tra cht lng ca KCS.

4.2.2 Trc khi lp ghp, tt c cc cu kin phi c kim tra, nghim thu theo nhng yu cu k thut sau:

- Cng b tng ca sn phm xut xng phi ph hp vi quy nh ca thit k, trng hp thit k khng quy nh cn phi bng hoc ln hn 80 % cng nn tui 28 ngy theo yu cu thit k, c xc nh bng kt qu th nghim nn mu ca nh sn xut;

- Hnh dng bn ngoi ca cu kin khng c bin dng, st m qu gii hn cho php, phi m bo kch thc hnh hc theo thit k v cc yu cu k thut ca TCVN tng ng cho cc sn phm ny, m bo chnh xc v tr cc khe, cc ch lm, hc, cc l ch lp ghp, v tr cc chi tit t sn, ct thp ch, chi tit nh v, v tr cc l cu, cht lng thp mc cu (tit din, chng loi thp lm mc, s bin dng ca mc cu khi xp d vn chuyn);

- Mt ngoi ca sn phm khng c c vt nt hoc r vt qu gii hn cho php. Mu sc v trang tr phi ph hp vi thit k.

4.2.3 Trn cc cu kin c sn, cn nh du trng tm, trc nh v theo cc phng. Nhng cu kin ca kt cu cn t hp th n v sn xut nh du. Nhng cu kin khng cn t hp do n v thi cng nh du. Cc ng trc c th c nh du bng khe rnh, tit din hnh tam gic hoc dng sn vch k trn mt chiu di ca trc. Nhng ch dn v vic nh du cc ng trc phi ghi r trong bn v thi cng.

i vi nhng cu kin c mt trn v mt di kh phn bit vi nhau hoc c ct thp chu lc khng i xng m khng c mc cu phn bit th phi ghi ch "trn" hoc nh du mi tn ln trn ngay t khi sn xut t ng v tr khi vn chuyn, k xp v lp ghp.

i vi nhng cu kin khng c php lt cng phi c nhng du hiu ch dn r rng v thch hp.

4.2.4 n v sn xut cn cung cp y v ng b theo n t hng ca n v thi cng cc cu kin c sn, km theo cc chi tit lin kt. Mc thp ca chi tit km theo phi ph hp vi mc thp ca cc chi tit lin kt t sn trong cu kin.

4.2.5 Cc cu kin c sn khi chuyn t ni sn xut n ni lp ghp cn trnh h hng. n v sn xut c trch nhim cu, xp cc cu kin ln phng tin vn chuyn khi xut xng sn phm. n v thi cng c trch nhim nghim thu, tip nhn, cu xp cu kin v bo qun trn cng trng.

Lch vn chuyn cc cu kin c sn n cng trng (thi gian, th t theo s lng v chng loi) cn ph hp vi trnh t lp ghp quy nh trong thit k t chc thi cng v theo ng tin thi cng.

4.2.6 Chiu di ca phng tin vn chuyn phi ph hp vi chiu di cu kin. Chiu di phn tha khng c vt qu chiu di cho php trong quy nh thit k v k xp vn chuyn cu kin.

Khi vn chuyn cc ct b tng ct thp c chiu di ln, cc dm, dm ko mi, tm sn bng b tng ng lc trc qu c, qu di v qu nng phi c xe moc chuyn dng k c cu kin trn 2 u hoc t khung gi trn sn xe phn tha ca cu kin. Khi vn chuyn cu kin c sn bng ng st, ng thy phi tun theo cc quy nh hin hnh v vn ti bng cc phng tin ny.

4.2.7 Khi vn chuyn cc cu kin c sn, cn tun theo cc yu cu sau:

- Bc, xp cc cu kin c sn ln phng tin vn chuyn hay k xp trn cng trng phi theo ng s ging no mc cu ch dn trong thit k t chc thi cng. Vic xp t phi m bo ng trnh t v v tr quy nh trong thit k cng nh hng dn ca n v sn xut.

- Cc ct, cc, dm, dm mi, tm bn cu thang, tm sn c v sn rng b tng ng lc trc hoc b tng ct thp khng ng lc trc c k xp v vn chuyn t th nm ngang. Cc tm tng ty trng hp c th t nm ngang hoc phi xp nghing trn gi ch A, do n v sn xut cu kin quy nh.

- Cc cu kin cn c k, ta trn cc tm m, chn, lt chuyn dng bng g v phi t ng v tr c quy nh theo quy trnh k xp sn phm ca nh sn xut. Chiu cao gi k phi cao hn mc cu v thp ch ca dm, tm sn v chiu cao vai ct. Trong mi trng hp, khng c p ngang mc cu hoc thp ch k xp cu kin. Chiu di gi k phi tha ra ngoi cnh cu kin t nht l 5 cm. Khi xp nhiu cu kin chng ln nhau, phi xp cc tm c cng chiu di v cc gi k phi t cng mt im theo chiu thng ng (Hnh 1, Hnh 2 v Hnh 3).

- Khi k x cc cu kin chng ln nhau, nu gi k khng t c cng mt im theo phng thng ng (c th do vng mc cu, thp ch, vai ..v.v..), th phi t gi k v pha tm cu kin, trnh t ra pha ngoi d gy nt cu kin.

Kch thc tnh bng milimt

Hnh 1 - K x p ct, cc b tng c t thp

Kch thc tnh bng milimt

Hnh 2 - K x p dm b tng c t thp ng lc trc

Kch thc tnh bng milimt

Hnh 3 - K x p tm sn b tng c t thp ng lc trc

Khi xp cu kin thnh nhiu lp trn cng trng, cn ch nhng vn sau y:

- Bo m k xp v nng chuyn cu kin d dng khi lp ghp, khng gy h hng cc cu kin bn cnh.

- Chiu cao xp chng cc lp cu kin c xc nh theo iu kin k thut v iu kin an ton, v c ch dn trong thit k t chc thi cng.

- Chiu rng li i gia cc chng khng nh hn 0,7 m. Khong cc gia cc chng k nhau khng nh hn 0,2 m.

- Khng xp cc cu kin ln li i ca cn trc v trn ng thi cng.

4.3 Lp ghp c u ki n

4.3.1 Yu cu chung

4.3.1.1 Ch lp ghp nhng cu kin bo m cht lng (c chng ch xut xng ca nh sn xut v phiu kim tra sau khi vn chuyn, k xp, bo qun). Trong phiu kim tra, phi ghi r kch thc hnh hc, cht lng cu kin, tin cy ca cc mc neo. Tt c s liu kim tra u phi ph hp vi thit k.

4.3.1.2 Ch lp ghp cu kin khi c bn v hon cng mng hoc cc kt cu , gi ta..v.v.. trong , phi c kt lun v s ng ca t vn gim st thi cng c thm quyn.

4.3.1.3 Trong qu trnh lp ghp, phi thng xuyn kim tra chnh xc lp t cu kin v xc nh v tr thc t cu kin c lp t bng my trc c. Cc kt qu kim tra (sau khi lin kt c nh) phi ghi trong bn v hon cng.

4.3.1.4 Trc khi kt thc vic kim tra, cn chnh v c nh cu kin, khng lp ln cc cu kin khc nu khng c php ca thit k.

4.3.1.5 Trong qu trnh lp ghp, phi m bo cng v n nh kt cu di tc ng ca ti trng bn thn, ti trng thi cng lp ghp v gi bo. Trn c s , cn thc hin ng cc quy nh v k, m v lin kt cc b phn cu to.

4.3.1.6 Vic lp ghp cu kin phi bt u t b phn cng ca cng trnh, cc chi tit lin kt, li cng, vch cng,..v.v..

i vi cc nh v cng trnh c chiu di v chiu cao ln th cn tin hnh lp ghp theo tng n nguyn n nh khng gian (theo khu , tng, khe nhit).

4.3.1.7 Vic lp ghp cc cu kin tng trn (nh nhiu tng) cn tin hnh sau khi b tng sn ti ch, cc mi ni lin kt ca cc kt cu chu lc tng di t cng theo ch dn trong thit k. Nu thit k khng quy nh, cng b tng sn v mi ni ti ch ca b tng ct thp thng phi bng hoc ln hn 70 % cng thit k. i vi trng hp sn b tng ct thp c sn lp ghp th cng b tng ti ch mi ni phi bng hoc ln hn 70 % ca cp B15.

4.3.1.8 Trong trng hp cng v n nh ca kt cu, di tc ng ca ti trng lp ghp c m bo bng cc mi hn, cc mi ni lp ghp, th c th tip tc lp cc tng trn nh khi cha b tng mi ni, nhng phi c nhng ch dn cn thit v trnh t lp ghp cc cu kin, hn lin kt v b tng mi ni.

4.3.1.9 i vi nh nhiu tng m n nh ca kt cu lp ghp c m bo nh cc lin kt vi tng th phi xy tng ng thi vi vic lp khung, hoc chm hn lp khung khng qu mt tng nh. Va trong cc mch tng xy khi lp cu kin tng trn phi t cng thit k.

4.3.1.10 C th p dng cc lin kt tm thi khi lin kt c nh khng m bo n nh ca kt cu trong giai on lp ghp, hoc khng th t cc lin kt ny trc khi kt thc vic kim tra cu kin lp ghp.

4.3.1.11 Vic kt hp lp ghp cu kin v lp t thit b phi tin hnh theo thit k thi cng, trong c phi hp cc s lp ghp cc tng v cc vng, biu nng cu kin v thit b cng ngh.

4.3.1.12 Trc khi nng cu kin, cn:

- Lm sch cu kin v v tr m cu kin s c lp: khng lm sch bng nc mn, nc c tp cht, du nht, khng p dng cc phng php t nng lm sch sn, du trn cc chi tit cu kin ln bn mt cu kin c trang tr, hon thin. Nn lm sch bng lau chi, co ra, chi;

- Kim tra chng loi cu kin theo thit k;

- Kim tra v tr v dung sai ca cc chi tit t sn, trc lp ghp;

- Lp dng gio sn thao tc theo yu cu ca thit k t chc thi cng v chun b ch nhn cu kin, kim tra ti ni lm vic cc chi tit lin kt v vt liu ph cn thit cho lp ghp;

- Kim tra tin cy v chnh xc cc dng c, thit b g lp.

4.3.1.13 Khi mc cp v nng cu kin, cn ch cc vn sau:

- Nu dng cp thp phi t m trnh dp hng b tng, bo v cp khi b h hi;

- Khi nng phi dng c cu kp gia m bo phn phi u ti trng ln cu kin v ln cc nhnh cp;

- Dy mc cp phi theo ng tiu chun v c c cu chuyn dng tho mc.

4.3.1.14 Vng mc cp phi t ng v tr ghi trong thit k, bo m nng, chuyn cu kin ln v tr lp t t th gn ging nh thit k. Nu iu kin lp ghp khng cho php, vic thay i v tr mc cp cn phi c s tha thun ca c quan thit k.

4.3.1.15 Vic s dng cc kt cu lp t lin kt vo cc thit b nng khc ch c php khi c ghi trong thit k thi cng hoc thit k cng trnh ca n v thit k.

4.3.1.16 Cu kin cn c nng t t khng git, khng o, khng quay, kt hp vi dy chng dn hng cu kin. dn hng cu kin c th s dng dy thng bn c ng knh 20 mm, dy ni lng hoc cp la mm ng knh 8 mm. Khi nng cc cu kin nm ngang, tm phng, cn c 2 dy dn hng hai u i din.

4.3.1.17 Khng ko l cc cu kin trong khi cu chuyn.

4.3.1.18 Phi t cu kin ng v tr thit k (ng trc, cao , gi ). Cc cu kin c chi tit t sn c bit hoc cc c cu nh v th phi lp t theo cc c cu .

4.3.1.19 Ch c tho mc cu sau khi lin kt chc chn cu kin bng cc lin kt tm thi hoc lin kt c nh. Cc lin kt tm thi phi m bo n nh v khng thay i v tr cu kin cho n khi thc hin xong cc lin kt c nh.

4.3.1.20 Trc khi lin kt c nh, cn kim tra v tr cu kin theo thit k. Cc kt qu kim tra ny cn c ghi vo s nht k lp ghp (Ph lc A).

4.3.1.21 Cn bo qun cn thn cu kin trong qu trnh lp ghp, trnh b h hng. Nhng cu kin h hng qu mc cho php, phi c thay th hoc sa cha theo s tha thun ca c quan thit k v t vn gim st thi cng.

4.3.1.22 Phi lp t mng chnh xc theo cc vch du trn mng v trn trc nh v cng trnh, ng thi phi thng xuyn kim tra bng my trc c.

4.3.1.23 Cc mng v mng phi c lm sch t, bi bn trc khi lp ghp ct, tng.

4.3.1.24 Di y mng cc c sn lp ghp cn c lp b tng lt phng lm sch hoc m ct vng m cht theo quy nh ca thit k. Khng t mng lp ghp trn nn c nc.

4.3.1.25 Khi mng u tin c lp t lm mc nn t v tr giao nhau gia cc trc tng nh (gc ca cng trnh). Cc chi tit khc s c lp tip theo sau khi kim tra v tr ca khi mng bng my trc c.

4.3.2 Lp ghp c t

4.3.2.1 Ct c th c lp vo cc mng hoc l chn ct lp vo thp ch t sn mng (Hnh 4 v Hnh 5).

Hnh 4 - V d lp ct vo mng c c

Khi lp ct, cn bo m vch du v k hiu chn ct trng vi:

- Trc nh v phn chia y mng cc;

- Trc hnh hc ca cu kin ly di;

- Nu ct c cc chi tit nh v t sn th vic lp t phi bo m s trng kht ca cc chi tit .

Hnh 5 - V d lp v neo gi ct vo mng c thp ch sn

4.3.2.2 Khi hiu chnh lin kt tm thi trong cc mng hoc thp ch mng, c th dng thit b g lp, nm g, dy cp v tng cn chnh, m bo chnh xc lp ghp.

4.3.2.3 Cn phi dng cht nh v hoc tm m bng m thp m bo cao thit k ca y ct.

4.3.2.4 Dng my trc c hoc thc kt hp vi nivo chuyn dng chnh tm trc, thng ng ca ct. Vic chnh u trn ca ct vo v tr thit k phi ng thi theo c hai trc phn chia: trc dc v trc ngang. Hiu chnh cao , tm trc v thng ng ca ct ch c thc hin khi c cu neo gi.

Dng nm g c nh chn ct vo cc mng hoc cn chnh nh v chn ct vo thp ch mng, tng v cp neo gi tm thi vo gng pha trn ct chc chn mi c tho mc cu (Hnh 4 v Hnh 5). Mc v gng neo cp phi c kim tra chc chn, sc chu ti neo gi v cn chnh ct. Tng cn c c cu chng tut cp khi hiu chnh ct.

4.3.2.5 Lp ghp v chng ct cho nh cao tng c th dng thanh chng cng bng ng thp c c cu iu chnh di chng ct xung sn nh v cn chnh thng ng ca ct (Hnh 6).

Hnh 6 - V d lp v ch ng ct bin cho nh cao t ng

4.3.2.6 Ch tho d thit b g lp, tng , dy cp neo, cy chng v tip tc lp cc cu kin, dm, tm sn sau khi b tng, va khng co chn c nh chn ct t 70 % cng thit k, hoc sau khi lin kt cm bng cc chi tit ging. Trong trng hp c bit, c th lp cu kin ln ct v khung trc khi b tng chn chn ct nhng phi bo m cht lng theo thit k v phi c ch dn c th trong thit k thi cng.

4.3.3 Lp ghp t ng, vch ng n

4.3.3.1 Khi lp tm tng hoc vch ngn, cnh ca tm phi trng vi vch du trn mt ta (vch du trn mt ta c xc nh theo trc phn chia).

Khi lp nh nhiu dy, cc tm dy u phi c lp nh lp nh mt dy.

Khi lp nh nhiu tng, phi hiu chnh cnh tm tng trn ang lp trng vi cnh tm tng tng di (trng hp cc tm tng c chiu dy khng i).

4.3.3.2 Khi lp cc tm l gia, ban cng ln cc tm tng chu lc pha ngoi nh phi s dng thit b g lp v chng chuyn dng.

4.3.3.3 Khi lp tm tng tng hm, tng k thut ca nh, phi chnh tng theo mt trong.

4.3.3.4 Phi cn c vo trc lp ghp (trc dc, trc ngang) hiu chnh tm tng vo v tr. thng ng ca tm tng phi c kim tra theo cnh.

4.3.3.5 Khi lp t tm tng v vch ngn, cn s dng thit b g lp chuyn dng. Thit b ny c cc c cu nh v cn chnh vo ng v tr thit k. Cn ch n nh ca cc cu kin lp trc .

4.3.3.6 i vi tm tng v vch ngn c cc chi tit nh v sn ( mu, kha, cht) th phi lp t theo cc chi tit . Khi lp cc tm tng nh nhiu tng c th s dng cc thanh

chng nghing bng thp ng c c cu iu chnh di cn chnh thng ng v chng ln mt sn pha trong nh.

4.3.3.7 n nh kt cu nh nhiu tng c th to cc lin kt truyn lc ngang ca sn nh v cc mi ni lin kt ti cc tm tng vo cu thang hoc cc lng thang my (li cng). Cn phi duy tr tt c cc cy chng ti cc v tr theo quy nh cho n khi t c s n nh ca kt cu.

4.3.3.8 Khi cu lp cc tm tng c hoc rng v tr ng thng cn s dng hai ng cp xoay, hoc c th cu chng khi xe ti v tr nm ngang v sau xoay chng v v tr thng ng bng cch s dng dy cp cu v bn lt tm vi cc thit b bo v chn tm cho chng khng b v khi xoay.

4.3.4 Lp dm, gi ng, d m mi (v ko)

4.3.4.1 Phi bo m ng v tr thit k ca dm, ging trong qu trnh lp ghp. Du ghi trn cu kin lp phi trng vi du ghi trn gi (vai ct).

4.3.4.2 Khi lp t dm cu trc, phi lin kt tm thi v kim tra chnh xc tng khu ca dm so vi gii hn cho php.

4.3.4.3 i vi dn, ko v dm, trc khi tho mc cp, phi kim tra lin kt vi kt cu theo thit k hoc lin kt tm thi theo thit k thi cng.

4.3.4.4 Phi kim tra xoay ca dm ch T v dm ch L khi chng c lp t khng ng tm. Vic chn nm gia cc cu kin sn v phn thn thng ng ca cc dm c th gip lm gim xoay. Khi lp ghp tm thi mt bn ca dm ch T, cn phi t tr chng tm thi bn di cnh chu ti cho n khi hon thnh ti trng cn i, hoc phi yu cu ngi thit k hng dn nhng mi ni tm thi. Cn duy tr ti trng cn bng sang hai bn ca dm ch T bng cch t cc tm sn thay i sang cc cnh i din ngn chn dm b vn hoc xoay.

4.3.4.5 gi n nh nhng dm, ko mi c mnh ln trong qu trnh vn chuyn, cu lp cn c bin php thi cng c bit nh: Chn dy cp chng c kch thc thch hp hoc thm mc ph gia dm gi cn bng trnh dm b lch tm v lt nghing c th gy nn nt gy dm. Tt hn l nn s dng hai cn trc c dy cp chng thng ng ti mi u dm. Khi cn thit phi s dng kt cu ph kp gi (np ngang), n gnh cu hoc gin tng cng chng vn, xoay. Nu s dng gin tng cng lp nhng cu kin nh trn cn thn trng khi tho gin ra, sao cho chng khng va vo cc cu kin c lp trc . Cn c dy cp chng hoc tr chng tm thi c nh cc dm c mnh ngang cho n khi chng c lin kt chc chn vo kt cu.

4.3.5 Lp tm sn c, sn r ng

4.3.5.1 Trc khi lp tm sn ln dm hoc tng chu lc, phi kim tra kt cu gi xc nh xem liu tt c cc kch thc c ph hp vi thit k v kim tra mt tm sn m bo phng nhn. Ch c lp tm sn khi cc kt cu chu lc n nh bng cc lin kt c nh nh chn va khng co mi ni hoc hn, lp bu lng lin kt. Dm phi c chng bn di theo quy nh ca thit k thi cng hoc ch dn ca thit k cng trnh.

4.3.5.2 Trnh t v hng lp tm sn cn c ghi r trong thit k thi cng v phi bo m n nh cng trnh, ng thi bo m kh nng lin kt cc tm vi kt cu chu lc. Din tch tip xc ca tm ln gi ta phi bo m theo ng ch dn ca thit k.

4.3.5.3 Cc tm sn hoc tm mi b tng ng lc trc lp cnh nhau c th xy ra trng hp cc mt y sn v mi khng n khp vi nhau do c s chnh lch v vng v dy. C th iu chnh trn cng trng bng kch cy chng bn di, gia ti hoc bng cc phng php tng t gim tc ng ca vng khc nhau v s sai khc theo ng thng ng ca cc cu kin lp cnh nhau trc khi lin kt cc cu kin hoc lp b tng b mt sn.

4.3.5.4 Trc khi lp cc tm mi, phi lp cc h ging ng v ngang m bo n nh tng th ca h dm mi, v ko mi v sau lin kt cc tm mi vo dm mi, dn mi. Bin php

v trnh t lp cc tm mi phi m bo s truyn lc xung dm di dng phn b u v i xng trong qu trnh lp ghp.

4.3.5.5 Khi lp t tm sn nh nhiu tng, trc ht phi lp t v lin kt cc tm ging.

4.4 Lin k t cc c u ki n lp ghp

4.4.1 va khng co ho c b tng chn m i ni

4.4.1.1 Vic lin kt cc mi ni lp ghp cu kin b tng ng lc trc c thc hin ch yu bng va khng co tha mn TCXD 258 : 2001 hoc b tng, khng thc hin lin kt hn.

Ch va khng co hoc b tng chn cc mi ni khi hon tt nhng cng vic sau y:

- Cc cu kin lp ghp m bo cc yu cu ca thit k, c chng hoc c nh tm thi, nh v tm trc v cao vi dung sai lp ghp trong gii hn cho php, c t vn gim st kim tra v chp thun nghim thu.

- Cc l ch phi c kim tra, thng tc, ty b va xi mng v b tng bm dnh, b mt phi c lm sch du, nht hoc cc cht bn khc bng dng c mi, phun nc p lc, kh nn hoc cc phng php thch hp khc. B mt b tng cn c gi m bng nc sch, nhng khng c ng nc trc khi va.

- Di y v xung quanh cc l h, mi ni c ghp bng khun g vn p hoc khun thp. Khun phi kn kht, phng v c chng dnh bng cht bi khun thch hp, ng thi phi cng v c neo gi chc chn trnh b h hng do p sut va hoc b tng cho n khi ng cng.

4.4.1.2 Va chn cc khe h nh v mi ni, cc l ch lp ghp vo thp ch sn phi l va xi mng vi ct liu t nhin, c linh ng cao v pht trin cng nhanh, khng co ngt, c cng theo yu cu ca thit k. Va khng co phi do cc c s sn xut c ng k cht lng hng ha cung cp. Ngoi chng ch cht lng ca nh sn xut, trc khi s dng n v thi cng phi tin hnh th nghim v c t vn gim st kim tra, chp thun. Quy trnh va cn tun th nghim ngt theo s hng dn ca nh cung cp v liu lng nc trn, phng tin thit b dng trn va, thi gian trn v thi gian cn kt thc vic rt va sau khi trn.

4.4.1.3 Tt c cc mi ni lin kt khi va khng co hoc b tng chn cn c ghi nht k chnh xc v tr trn cng trnh, tn cu kin v ngi thc hin, ng thi phi c t vn gim st kim tra, nghim thu (Ph lc B).

4.4.1.4 Cc mi ni lin kt kch thc ln c hoc khng c thp lin kt c b tng ng thi vi lp b tng b mt sn hoc trc , m bo ng nht vi b tng cu kin, c cng theo quy nh ca thit k. Cng b tng mi ni chu lc khi tho d vn khun phi t yu cu mc thit k.

4.4.1.5 Cng tc , m v bo dng b tng, cng tc kim tra cht lng c tin hnh theo ng quy nh ti 6.4, 6.5 v iu 7 ca TCVN 4453 : 1995.

4.4.2 Hn v ch ng n mn m i ni, chi ti t t sn

4.4.2.1 Hn lin kt mi ni c s dng ch yu trong thi cng lp ghp cu kin b tng ct thp thng thng, khng dng lin kt hn i vi thp ng lc trc, tr mt s trng hp c bit hn cc chi tit t sn b phn khng ng lc trc ca cu kin theo yu cu v ch dn ring ca thit k.

4.4.2.2 Cng tc hn phi do th hn hp chun c chng ch thc hin v phi quy nh r tiu chun bc th cho cc loi lin kt hn, theo TCVN 6700-1 : 2000 (ISO 9606-1 : 1994).

4.4.2.3 Vt liu hn trc khi s dng phi c trnh mu, ngun gc xut x v c t vn gim st chp thun.

4.4.2.4 Vt liu hn phi c ch dn trong thit k. Trong trng hp thit k khng c ch dn v c s cho php ca thit k th c th chn vt liu hn ph hp vi k thut hn theo TCVN 6834-2 : 2001 (ISO 9956-2 : 1995).

4.4.2.5 Vt liu hn phi c bo qun trong iu kin chng m, chng nhim bn du, nht v cc bi bn khc, trc khi hn phi c sy theo ch dn trong cc iu kin k thut v l lch ca chng.

4.4.2.6 Vt liu hn c chuyn n ch lm vic ca th hn theo s lng cn thit hn trong mt ca v phi c bo qun kh ro.

4.4.2.7 Cng tc hn mi ni c thc hin theo cc tiu chun, ch dn v hn ct thp hin hnh, ng thi phi theo ng quy nh cng ngh hn quy nh trong thit k thi cng. Cn xc nh trnh t cng tc hn lp ghp; phng php hn; trnh t thc hin cc mi ni, ch hn, ng knh cc que, si hn v cc yu cu khc i vi vt liu hn.

4.4.2.8 Sau khi hn, phi g sch x hn bm dnh trn mi hn.

4.4.2.9 Nhng mi hn chu lc phi c nh du hoc gn m hiu, k hiu ca th hn trn s hon cng mi hn, cn ghi nht k cng tc hn (Ph lc C) v phi lp bin bn nghim thu cng tc hn.

4.4.2.10 Cng tc kim tra cht lng mi hn:

- Kim tra vt liu hn, iu kin bo qun, sy v thit b hn cng nh tnh trng thit b hn, ngun in, cht lng lp ghp chi tit hn, trnh tay ngh th hn;

- Kim tra nh k vic thc hin quy trnh hn;

- Kim tra kch thc ton b cc mi hn, th nghim xc nh cng mu hn sau khi kim tra xem xt bng mt. Khi cn thit c th kim tra mi hn bng phng php siu m hoc ct ly mu v tr ni ko th trong phng th nghim hp chun.

4.4.2.11 Khi kim tra v nghim thu mi hn cn theo yu cu v k thut hn trong tiu chun TCVN 6834-2 : 2001 (ISO 9956-2 : 1995).

4.4.2.12 Vt liu chng g, bin php v trnh t thc hin lp chng g cng nh vic bo v lp chng g cn phi c thc hin theo ch dn ca thit k.

4.4.2.13 Trc khi ph lp bo v ln b mt chi tit t sn, mi ni lin kt, mi hn, cn lm sch x hn, kim loi bm dnh, bi bn Trong qu trnh ph lp bo v cn c bit ch sao cho lp bo v ph kn cc gc cnh ca chi tit.

4.4.2.14 Cht lng lp chng g, lp bo v cn c kim tra theo yu cu thit k. S liu kim tra c ghi vo bin bn nghim thu cng tc khut.

4.5 lp b tng b m t sn ng lc trc ti cng tr ng

4.5.1 Sau khi lp ghp cc tm sn c v sn rng b tng ng lc trc, phi chng cc dm v sn theo quy nh ca thit k thi cng, hiu chnh vng v chnh lch mp cc tm cnh nhau, nh nu trong iu 4.3.5.3 v c t vn gim st chp thun nghim thu trc khi tin hnh lp b tng trn mt sn.

4.5.2 Vic lp b tng mt sn cho ton b sn sau khi lp ghp xong hoc ngay sau khi lp c mt s khoang sn to n nh cho kt cu cng trnh do thit k quy nh. Trng hp khng c trong quy nh ca thit k, th thc hin theo bin php t chc thi cng c ph duyt.

4.5.3 dy v cng lp b tng b phi tun theo yu cu ca thit k. Vt liu s dng cho b tng ti ch phi tun theo cc yu cu k thut trong cc tiu chun hin hnh:

- Xi mng theo TCVN 2682 : 2009 hoc TCVN 6260 : 2009, ct thp theo TCVN 1651 : 2008, ct liu cho b tng theo TCVN 7570 : 2006, nc theo TCVN 4506, ph gia theo TCVN 8826 : 2011.

S dng vt liu theo cc tiu chun nc ngoi phi do thit k quy nh. n v thi cng phi trnh mu, ngun gc xut x v chng ch cht lng vt liu c chp thun a vo s dng.

4.5.4 Khi lp ct thp lin kt mi ni, thp m men m u tm sn v li thp khng c un ngang cc thp ch mt dm v thp ch sn ca tm sn lp ghp bo m lin kt tt gia lp b tng b v cu kin lp ghp.

4.5.5 Cng tc thi cng, kim tra cht lng v nghim thu lp b tng b mt sn c thc hin theo cc iu 4, 5, 6, 7 ca TCVN 4453 : 1995.

4.5.6 i vi cc sn nh nhiu tng, vic chng tng trn sau khi tho gio chng tng di phi m bo lp b tng b t 70 % cng thit k. Vic cht ti thi cng cc tng tip theo phi c quy nh cht ch trong thit k thi cng hoc do k s thit k kim tra, chp thun.

5. Yu cu i vi cng tc an ton lao ng trong thi cng

5.1 Trc khi thi cng lp ghp cng trnh bng cu kin b tng c sn, n v thi cng phi lp "Bin php t chc thi cng" v c ph duyt, nh quy nh ti 4.1.2. Trong "Bin php thi cng" nht thit phi c cc bin php m bo an ton cho ngi v thit b, v sinh lao ng v bo v mi trng.

5.2 S dng thit b cu lp cu kin, cn thc hin cc iu quy nh c lin quan trong TCVN 4244 : 2005.

5.3 S dng in v my hn in, cn m bo cc yu cu v an ton c quy nh trong cc TCVN 4086 : 1985 v TCVN 3146 : 1986.

5.4 Trong qu trnh lp ghp phi c cn b k thut thi cng hoc i trng hng dn gim st.

5.5 Trc mi ca lm vic, cn b k thut hoc i trng phi trc tip kim tra cc iu kin m bo an ton nh: gin gio gi , sn thao tc, cu thang, li i li Kt thc mi bui lm vic, nht thit phi neo gi, gia c chng tm thi hay c nh tt c cc cu kin lp ghp, khng gy mt n nh di tc dng ca ngoi lc nh gi bo hay phng tin va qut. Cn ghi nht k v bn giao cho ca sau tt c nhng im cn lu v cng tc an ton.

5.6 Khi lp cu kin b tng phi c gin gio hoc gi theo quy nh ca thit k thi cng. Trng hp lm khc vi thit k quy nh phi c cn b k thut thi cng cho php.

5.7 Cc cu kin b tng khng c b phn mc cu chuyn dng phi c tnh ton xc nh v tr v cch treo buc m bo trong sut qu trnh nng chuyn khng b trt, ri.

5.8 i vi nhng cu kin b tng trong qu trnh cu lp d b bin dng sinh ra ng sut ph phi c gia cng chc chn trc khi cu ln.

5.9 Ngi tip nhn cu kin b tng trn cao phi ng trn sn thao tc ca dn gio hoc gi v phi eo dy an ton. Dy an ton phi mc vo b phn kt cu n nh ca cng trnh. Khng ng trn cc kt cu, cu kin lp rp cha n nh chc chn. Khng vi tay n, ko hoc xoay cu kin khi ang treo l lng.

5.10 Ch c tho mc cu ra khi cu kin lp ghp sau khi lin kt tm thi hay c nh theo ng quy nh ca thit k hoc bin php thi cng. Khng cho php iu chnh, x dch cu kin c lp t sau khi tho mc cu, tr nhng trng hp thit k thi cng c quy nh.

5.11 Khng c ngng cng vic khi cha lp t cu kin vo v tr n nh v hon thnh vic lin kt c nh hoc tm thi vo kt cu cng trnh.

5.12 Khng xp hoc t tm cc cu kin b tng ln sn tng hoc sn thao tc vt qu kh nng chu ti theo thit k.

5.13 Ngoi cc iu quy nh c th trn y cn thc hin cc yu cu khc c lin quan trong TCVN 5308 : 1991.

6. Kim tra nghi m thu cng tc l p ghp

6.1 Vic kim tra nghim thu cng tc lp ghp cc cu kin b tng c sn cn thc hin cc yu cu sau:

- Xc nh cht lng cu kin so vi thit k;

- nh gi cht lng cng tc lp ghp;

- Kim tra mc hon thnh ca cng trnh (hay hng mc cng trnh) sau khi lp ghp xong v kh nng tin hnh thi cng cc cng vic tip theo;

- Kp thi sa cha cc sai st trong qu trnh lp ghp.

6.2 Cn tin hnh kim tra nghim thu nhng vn sau y:

- Mc chnh xc ca vic lp ghp cc cu kin, kn kht ca ch tip gip gia cc cu kin vi nhau v vi gi ; dung sai thc t so vi dung sai cho php; vng ca cu kin, phng y ca cc tm sn, chnh lch mp cc tm sn cnh nhau, cng tc chng cu kin;

- Cht lng va khng co, b tng chn mi ni lp ghp v khe h, cht lng mi hn lin kt;

- S nguyn vn ca cc cu kin v b phn lp ghp;

- Vic thc hin nhng yu cu c bit khc ca thit k.

6.3 Cn tin hnh nghim thu cc cng tc khut v nhng vn sau y:

- Lp lt di mng tng, mng ct;

- Cc mng (lp ghp hay ti ch) trc khi lp ghp ct hoc tng;

- Cc gi v mt ta ca cu kin;

- Ct thp lin kt mi ni, thp m men m u tm sn, li thp lp b tng b mt sn; cht lng mi hn lin kt v cc chi tit t sn;

- Mc chn kn cc khe h v mi ni lin kt bng va khng co hoc b tng.

Khi nghim thu, nh gi cht lng cng tc thi cng lp ghp cu kin b tng c sn cn cn c cc kt qu kim tra thi cng theo mu biu (cc Ph lc A, B v C), nht k cng trnh v cc yu cu k thut trong iu 8 ca TCVN 4055 : 1985 v cc quy nh hin hnh ca nh nc v qun l cht lng cng trnh xy dng.

6.4 Vic kim tra nghim thu cn c tin hnh sau mi giai on cng vic trc khi chuyn tip sang giai on cng vic khc chnh sa kp thi, trnh nhng sai st h thng. Cn tin hnh quan st, kim tra v o c ti ch v lp s hon cng, trong ghi r sai lch thc t so vi thit k.

6.5 Vic kim tra v nghim thu cho php trin khai thi cng cc cng tc lp ghp tip theo c tin hnh sau khi lp ghp xong ton b kt cu cng trnh hoc mt b phn cng trnh c cng khng gian ring bit (nhp, khung nm trong phm vi gia cc khe nhit..v.v..).

6.6 Khng tin hnh trin khai cng tc lp ghp tip theo khi cha c kt lun cho php thi cng tip ca t vn gim st thi cng hoc Hi ng kim tra, nghim thu.

6.7 Sai lch cho php khi lp ghp cc cu kin b tng c sn khng vt qu cc tr s quy nh trong thit k. Nu trong thit k khng quy nh sai lch cho php th mc cho php khi lp ghp khng c vt qu cc tr s trong Bng 1.

6.8 H s nghim thu kt cu b tng lp ghp gm c:

- Chng ch xut xng ca cc cu kin c sn;

- Cc vn bn xc nh cht lng, ngun gc xut x vt liu xy dng nh: va khng co, b tng chn, que hn, sn chng g, ct thp, b tng b, cc vt liu khc s dng trong cng trnh;

- Bn v hon cng lp cu kin, trong ghi r sai lch thc t so vi thit k;

- Bin bn hoc bn v thay i thit k;

- S kim tra trc c cng trnh;

- S "Nht k thi cng cng trnh" ghi mi din bin trong qu trnh thi cng t khi khi cng n khi kt thc v nhng tha thun bin php x l k thut gia nh thu v t vn gim st hoc i din thit k.

- Nhng cng vic quan trng c ghi nht k theo mu biu ring: nht k cng tc lp ghp (Ph lc A), nht k cng tc va khng co hoc b tng chn mi ni v khe h (Ph lc B), v nht k cng tc hn (Ph lc C);

- Bin bn nghim thu cng tc khut;

- Kt qu th nghim cht lng mi hn v b tng chn mi ni;

- Bin bn lit k chng ch, trnh tay ngh ca cng nhn tham gia lp ghp;

- Cc chng ch kim tra cht lng vt liu u vo.

Bng 1 - Sai l ch l p ghp cho php

Tn ch tiu Mc cho php (mm) Ghi ch

1. Sai lch trc khi mng v cc mng so vi trc nh v 15

2. Sai lch cao mt ta trn mng so vi thit k - 10

3. Sai lch cao y cc mng so vi thit k - 20

4. Sai lch trc nh v chn ct 10

5. Sai lch cao mt trn ca ct hoc vai ct (k c i vi nh nhiu tng) 10

6. Sai lch thng ng u ct, khng ln hn 0,10 % x h 12 h = chiu cao ct

7. Sai lch trc cc u dm, dm cu trc, dm mi 10

8. Sai s cao mt dm lm gi tm sn + 5, - 15

9. khng thng ng ca thnh dm 1,0 % x h h = chiu cao dm

10. Sai lch di gi (hng chiu di dm) 15

11. Sai lch b rng gi (hng chiu ngang dm) 10

12. Sai lch theo phng thng ng tm tng, cch cng so vi trc phn chia trn mt tng nh 10

13. Sai s cao nh tng 10

14. Sai lch thng ng theo mt ngang tng 10

15. Sai lch cao con sn, gi ca tng lp dm, sn + 5, - 10

16. Sai lch di gi tm sn (hng chiu di tm) 15

17. Chiu cao mt tm sn ti gi : + Sn c b + Sn khng b

15 5

18. Chnh lch y hai tm sn cnh nhau, khng ln hn L/2000 10

L = chiu di tm sn

19. Khe h lin kt gia cc tm sn: + Sn di ti 10 m + Sn di ti 15 m + Sn di hn 15 m

5 10

max = 12

Ph lc A

(tham kho)

Nht k l p ghp

Tn cng trnh: .....................................................................................................

Hng mc cng trnh: ...........................................................................................

n v thi cng: ....................................................................................................

i: ....................................................... , T:.......................................................

Thi cng l p ghp Kt qu kim tra Ngy thng hon thnh

M hiu cu ki n

V tr l p ghp Ni dung sai lch

Mc cho php (mm)

Sai lch thc t (mm)

1 2 3 4 5 6

K thu t gim st K thu t thi cng T (cng nhn th c hi n)

(Ch k, h tn) (Ch k, h tn) (Ch k, h tn)

Ph lc B

(tham kho)

Nht k va khng co, b tng chn m i ni

Tn cng trnh: .....................................................................................................

Hng mc cng trnh: ...........................................................................................

n v thi cng: ....................................................................................................

i: ....................................................... , T:.......................................................

Thi gian thi cng: Ngy thng nm ............................................................

Phm vi thi cng:

- Trc ngang: T trc ............ n trc .........................................................

- Trc dc: T trc ............ n trc..........................................................

- Tng s: .............. , ct cao : ...................................................................

- Tn cu kin: ..............................................................................................

.............................................................................................

- Loi va,mc b tng s dng: ...................................................................

- S lng l chn: ........................................................................................

- Khi lng : ............................................................................................

- Ngi (nhng ngi thc hin): .................................................................

......................................................................................................................

- Kt qu kim tra nghim thu:........................................................................

K thu t gim st K thu t thi cng T (cng nhn th c hi n)

(Ch k, h tn) (Ch k, h tn) (Ch k, h tn)

Ph lc C

(tham kho)

Nht k cng tc hn

Tn cng trnh: .....................................................................................................

Hng mc cng trnh: ...........................................................................................

n v thi cng: ....................................................................................................

i: ....................................................... , T:.......................................................

Kt qu kim tra m i hn Ngy thng hon thnh

Tn chi tit

V tr mi hn theo s

M hiu que hn

Chiu cao ng hn

(h)

Chiu di mi hn

(L)

Kim tra b ng ngo i quan (hoc bng siu m)

1 2 3 4 7 6 7

K thu t gim st K thu t thi cng T (cng nhn th c hi n)

(Ch k, h tn) (Ch k, h tn) (Ch k, h tn)

MC LC

Li ni u

1 Phm v p dng

2 Ti liu vin dn

3 Thut ng v nh ngha

3.1 Cu kin

3.2 Cu kin b tng ng lc trc cng trc

3.3 Va khng co

3.4 Mi ni

4 Yu cu i vi cng tc thi cng kt cu b tng lp ghp

4.1 Quy nh chung

4.2 Vn chuyn, k xp, nghim thu cu kin ti cng trng

4.3 Lp ghp cu kin

4.4 Lin kt cc cu kin lp ghp

4.5 lp b tng b mt sn ng lc trc ti cng trng

5 Yu cu i vi cng tc an ta lao ng trong thi cng

6 Kim tra nghim thu cng tc lp ghp

Ph lc A Nht k lp ghp

Ph lc B Nht k va khng co, b tng chn mi ni

Ph lc C Nht k cng tc hn