TCCS xxx:2013/VNPT - QTKT

QUY TRNH THI CNG XY DNG NG CNG B LP T CP QUANG S DNG NG HDPE DC NG CAO TC

TI U CHUN C SH NI 2013MC LCI.Quy nh chung3I.1Phm vi v i tng p dng3I.1.1Phm vi p dng3I.1.2i tng p dng3I.1.3Cc nh ngha, thut ng3I.1.4Ti liu vin dn4I.1.5Quy nh chung4II.Quy trnh thi cng h thng tuyn cng b dc ng cao tc.8Hnh II-1: S thi cng tuyn cp mi9II.1o rnh9II.2t ng11II.2.1Kim tra rnh cp trc khi lp t ng11II.2.2Lp t ng.11II.3Lp t, hon tr mt bng13III.Quy trnh thi cng b cp dc ng cao tc13III.1Yu cu chung13III.2Thi cng b cp bng phng php trc tip14III.2.1Thi cng b cp bng phng php xy15III.2.2Thi cng b cp bng phng php b tng ti ch19III.3Thi cng b cp c sn21III.3.1Trnh t thi cng b cp c sn21III.3.2o h21III.3.3Lp t b cp c sn21III.3.4Lp t np b cp22III.4Thi cng B cp bng phng php lp ghp22III.4.1Trnh t thi cng b cp bng phng php lp ghp23III.4.2o h23III.4.3Lp ghp cc cu kin b tng ct thp b cp cp23III.4.4Hn v chng n mn mi ni v cc chi tit t sn25III.4.5Chn kn cc khe h, hon thin cc mi ni26III.4.6Lp t np b cp26III.5Thi cng b cp bng phng php hn hp26III.5.1B cp c y ti ch, thnh l b tng c sn, np ti ch27III.5.2B cp c y ti ch, thnh l b tng c sn, np c sn27III.5.3B cp c y c sn, thnh l b tng ti ch, np ti ch29III.6Mt s cng tc chung khi thi cng b cp29III.6.1Thi cng b tng ct thp30III.6.2Va xy dng36III.6.3Ch to np b cp bng b tng ct thp36IV.Cc yu cu hn ni, lp t ph kin, bin bo38IV.1Cc yu cu hn ni ng HDPE t hp38IV.1.1Tho b lp bo h ng38IV.1.2Ct b ng bn ngoi39IV.1.3Chnh sa ng bn trong39IV.1.4C nh ng bn trong39IV.1.5Lp ng ni ca ng bn trong40IV.1.6Lp gioong chng nc bn ngoi40IV.1.7Lp np y vo ng ngoi40IV.1.8Ni ng hon tt41IV.2Cc yu cu hn ni ng HDPE xon41IV.3Lp t bin bo43

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Quy nh chungPhm vi v i tng p dngPhm vi p dngQuy trnh thi cng xy lp tuyn cng b s dng ng nha HDPE lp t cp quang trn ng cao tc quy nh trnh t thi cng cc cng trnh xy dng cc tuyn cng b t ng nha HDPE phc v lp t cp quang trn cc ng cao tc ti Vit Nam ca Tp on Bu chnh Vin thng Vit Nam (VNPT).Quy trnh ny ch p dng cho cc tuyn cng b xy dng mi dc theo tuyn ng cao tc. Khng p dng cho cc tuyn cng b chy trong hm k thut c sn ca ng cao tc.i tng p dngCc t chc, c nhn tham gia thi cng cc cng trnh xy lp tuyn cng b s dng ng nha HDPE lp t cp quang trn ng cao tc ca Tp on Bu chnh Vin thng Vit Nam cn tun th theo quy trnh ny. Cc nh ngha, thut ngI.1.3.1. ng cao tc - Highwayng cao tc l loi ng chuyn dng cho t chy vi cc c im sau: tch ring hai chiu (mi chiu ti thiu phi c 2 ln xe); mi chiu u c b tr ln dng xe khn cp, trn ng c b tr y cc loi trang thit b, cc c s phc v cho vic bo m giao thng lin tc, tin nghi v ch cho xe ra, vo, cc im quy nh.I.1.3.2 Cng cp - Conduit/DuctCng cp l nhng on ng c ghp ni vi nhau chn ngm di t bo v v dn cp.I.1.3.3 ng nha HDPE - High Density Polyethylene Pipe plastic L loi ng nha s dng vt liu ch to ng l vt liu nha PE t trng cao nguyn cht, c b sung cc cht ph gia tng kh nng chng -xy ha, chng nh hng ca tia t ngoi, cht chng cn trng xm hi v to mu..I.1.3.4 ng nha phng HDPEp - High Density Polyethylene Flat Pipe plasticL loi ng nha HDPE c mt ngoi ng phng.I.1.3.5 ng nha HDPEx - High Density Polyethylene Spiral Pipe plastic L loi ng nha HDPE c mt ngoi ng xon.I.1.3.6 ng nha HDPEt - High Density Polyethylene Pipe plastic combinationng nha HDPEt c cu to bao gm cc ng nha HDPEp c bao bc bng ng nha HDPEx pha ngoi.I.1.3.7 B cp - Jointing Chamber B cp l mt tn chung ch mt khoang ngm di mt t dng lp t cp, cha cc mng xng v d tr cp.I.1.3.8 Khong b - Span of Manhole Khong b l khong cch gia hai tm ca hai b cp lin tip lin k nhau.Ti liu vin dnQCVN 33:2011/BTTT Quy chun k thut quc gia v lp t mng cp ngoi vi vin thng" 04/2011;TCVN 8699:2011 Mng vin thng - ng nha dng cho tuyn cp ngm Yu cu k thut/2011;QCVN: 33/2011/BTTTT: Quy chun k thut quc gia v lp t mng cp ngoi vi vin thngNgh nh 15/2013/N-CP ngy 06 thng 02 nm 2013 v qun l cht lng cng trnh xy dng.TCVN 1770: 1986 "Ct xy dng - Yu cu k thut ". TCVN 8700:2011 Cng, b, hm, rnh k thut v t u cp Vin thng Yu cu k thut.TCVN 4452: 1987 Kt cu b tng v b tng ct thp lp ghp - Quy phm thi cng v nghim thu.TCVN 4459:1987 Hng dn pha trn v s dng va xy dng.Quy nh chungiu kin xy dng tuyn cng, b cpQuy chun xy dng tuyn cng, b trn ng cao tcTun th theo thit k thi cng c tha thun gia ch u t ng cao tc v bn lin quan. Cng trnh xy dng tuyn cng b phi c thc hin tun th theo cc quy nh c ban hnh ca Tp on v Nh nc.iu kin cn thit khi thi cng tuyn b cp, tuyn cp trn ng cao tcCng trnh tuyn cng b trn ng cao tc c thit k, xy dng ng b vi bn thit k tuyn ng cao tc, nn ch c php khi cng xy dng khi tuyn ng c ph duyt thit k, c y cc loi giy php ca bn ch u t, thi cng ng cao tc, cc c quan v a phng c lin quan. Bn v v tr thi cng tuyn cng b c duyt.Khi cha c thit k bn v thi cng chnh thc, nht thit khng c khi cng xy dng cng trnh.n v thi cng khng c t thay i hoc sa cha thit k v bn v thi cng.Trng hp cn sa i, phi trao i li v c s ng ca tt c cc bn c lin quan.Kho st thc a tuyn b, cp trn ng cao tcng cao tc thng l tuyn ng c xy dng mi, c cng tc gii phng mt bng. Cc cng trnh ph tr i km ng cao tc u c tnh ton, thit k ng b vi nhau trong qu trnh thi cng; Kho st chun b thi cng tuyn cng b trn ng cao tc nm cc s liu cn thit lm c s cho vic lp k hoch thi cng. Thnh phn tham gia kho st chun b thi cng l cc cn b ch cht ca n v trc tip thi cng, c th c ch u t, n v thit k v cc n v lin quan (nu c);Trc khi i kho st phi lp k hoch kho st nu r yu cu, thi gian, phng tin, nhng ngi i kho st. Ngi i kho st phi nghin cu trc h s thit k bn v thi cng, o c ca n v thit k do ch u t cung cp. Yu cu v nhim v c th ca cng tc kho st chun b thi cng.Nghin cu bn v thi cng c duyt bit c v tr chnh xc tuyn cng b c t trn ng cao tc;Tm hiu nhng ch trng yu ca cng trnh, nghin cu bin php thi cng bo m cht lng k thut, an ton thng tin, an ton lao ng;D kin a im tp kt vt liu, phng tin di chuyn..ng b vi cng tc thi cng ng cao tc.o c khi kho st. Khi o c li xc nh v tr cc mc ca tuyn cng b phi da vo ng k o c ca thit k c ph duyt bi tt c cc bn lin quan. Sau khi kho st v phi lm bo co kho st lm cn c xy dng k hoch thi cng v lm cn c cp c thm quyn ph duyt k hoch thi cng. Bn bo co kho st thi cng phi y cc ni dung sau y:Phi c phn thuyt minh r rng mi tnh hnh v s liu v kho st thu lm c;Nu nhng kh khn tn ti cha gii quyt c hoc nhng vn cha c xc nh cn phi tip tc nghin cu, tm hiu v gii quyt;D kin, xut nhng bin php gii quyt cc vn tn ti;Bn v thi cng tuyn cng b phi da vo bn v thi cng ng. V tr ca tuyn cng b c t ti u. S bn v phi r rng, cc chi tit bn v phi st vi thc t ngi xem c th hnh dung c v tr trng yu ca tuyn khi s dng bn . K hiu ghi chp phi thng nht v theo ng quy nh chung.Lp phng n thi cngn v thi cng phi lp k hoch thi cng (phng n thi cng, t chc thi cng) bo m thi cng ng theo thit k c duyt v theo cc tiu chun k thut ca quy phm, tiu chun v cc quy nh lin quan, bo m thi cng ng khi lng, cht lng, thi hn v h gi thnh xy dng cng trnh.Phi c k hoch bo m an ton lao ng v an ton v sinh lao ng theo ng cc quy nh hin hnh.Cc yu cu khi thi cng tuyn cng, b cp trn ng cao tcYu cu i vi vt t, vt liu dng trong thi cng tuyn cng, b cpVt t, vt liu dng thi cng cng, b cp phi tun theo cc quy nh trong thit k v cc tiu chun hin hnh ca Nh nc, Tp on Bu chnh Vin thng Vit Nam. Cc loi ct dng cho va xy, va trt phi p ng cc yu cu quy nh theo TCVN 1770: 1986 "Ct xy dng - Yu cu k thut;Xi mng phi m bo cht lng theo quy nh ca nh my sn xut v c giy chng nhn cht lng ca t chc kim tra cht lng sn phm (KCS).Cc loi gch, dng xy phi m bo yu cu v cng , quy cch v tiu chun k thut theo quy nh trong cc tiu chun hin hnh ca Nh nc v gch, xy;ng nha HDPE dng trong cng trnh phi c cc tiu chun k thut tun theo TCVN 8699: 2011 Mng vin thng - ng nha dng cho tuyn cp ngm yu cu k thut.Vt t, vt liu trc khi a vo s dng phi c nghim thu v s lng v cht lng. Trong trng hp cn thay i vt t, vt liu khc so vi thit k phi c s ng bng vn bn ca cp c thm quyn;Vt t, vt liu dng trong thi cng phi c bo qun v phn cng ngi qun l theo ng quy trnh, quy phm v bo qun vt t, vt liu.Yu cu vi vn chuyn, phn ri vt t, vt liuCc vt liu xy dng mt tuyn b, cp phi tp trung kho ti nhng a im c quy nh, thun tin cho vic phn ri sau ny. Trong qu trnh vn chuyn, tp kt v phn ri vt liu khng c vt liu h hng mt mt, v phi trit bo m an ton.Trc v sau khi phn ri vt liu n chn cng trnh, phi kim tra quy cch, cht lng v s lng cc loi vt liu. Nhng vt liu khng ng quy cch v cht lng xu, nht thit khng c s dng vo cng trnh.Khi vn chuyn cc vt liu c kh nng b h hng, tht thot v gy nh hng n mi trng nh xi mng, ct, ... phi c che y k phng gi, nc ma ph hoi.Yu cu i vi ngi, n v thi cng tuyn cng, b cpi vi ngi thi cng:Phi tui theo quy nh ca Nh nc;C giy chng nhn bo m sc kho lm vic do c quan y t c thm quyn cp;C chuyn mn v thi cng tuyn cng b bit s dng cc dng c, my, thit b thi cng thuc lnh vc c giao;c hun luyn v kim tra t yu cu v an ton v sinh lao ng trong cng vic c giao. Chp hnh cc quy nh v an ton lao ng, v sinh lao ng trong thi cng cng, b, h cp.i vi n v thi cng: cng trnh c thi cng m bo cht lng, an ton lao ng, ng b, m bo k thut thng tin, k thut an ton v hiu qu cn chn n v xy lp c kinh nghim thc hin thi cng cng trnh.Tun th cc quy trnh k thut an ton thng tin, an ton in, an ton lao ng trong qu trnh thi cng cng nh trong cng tc qun l, vn hnh v sa cha.Yu cu vi my mc, thit b thi cng My, thit b thi cng tuyn cng, b cp phi tun theo cc tiu chun hin hnh ca Nh nc v phi ph hp vi:Quy cch, kch thc, khi lng ca cng, b cp;Cc cu kin cng, b cp v ph kin;Phng php thi cng cng, b cp;c im ca khu vc thi cng cng, b cp, ...My, thit b thi cng khi a ra cng trng phi c bo qun v phn cng ngi qun l theo ng quy trnh, quy phm v bo qun my, thit b.Kim tra v nghim thuCng tc kim tra v nghim thu cht lng b, cp phi tun theo cc quy nh hin hnh ca Nh nc, h s thit k v thi cng cng trnh. Cc ti liu v tiu chun nh gi cht lng cng, b cp, quy trnh thi cng, nghim thu v cc ti liu lin quan c quy nh chi tit ti Quy phm xy dng mng ngoi vi Vin thng.An ton lao ngn v thi cng phi tun theo quy nh an ton lao ng ca Tp on v ca Nh nc ban hnh bo m an ton cho ngi, vt t v thit b trong sut qu trnh thi cng. Khi thi cng phi c bin bo cng trng v c cng nhn hng dn xe c qua li. Nhng ni thi cng d qua m phi c bin bo v n hiu.n v thi cng phi xy dng phng n thi cng, phng n an ton ph bin n tt c cn b CNV tham gia thi cng, thc hin trang b phng h lao ng v kim tra dng c thi cng, an ton trc khi s dng.n v thi cng phi chu trch nhim v an ton lao ng cho ngi v vt t.Phi hp cc phn vic thi cng bo m an ton cho ngi, vt t v phng tin.Khng gy cn tr giao thng, cn tr v vn hnh in trong qu trnh thi cng.Do tuyn cp thi cng st vi cc cng trnh ngm c sn, nn n v thi cng phi phi hp vi cc n v ch qun cc cng trnh ngm hin c trn c phng n thi cng, khng lm h hi n cc cng trnh hin c.Trong qu trnh thi cng nu c s c hoc khng th thi cng theo thit k k thut, n v thi cng hoc gim st thi cng phi c trch nhim bo cho n v ch qun v n v thit k bit phi hp a ra phng n gii quyt. Nu gim st thi cng hoc n v thi cng khng bo cho thit k v n v ch qun bit m t thay i th mi s c xy ra tc thi hoc v sau, gim st thi cng v n v thi cng phi hon ton chu trch nhim..Quy trnh thi cng h thng tuyn cng b dc ng cao tc.Ty theo bn v c duyt ca bn thi cng ng cao tc v v tr t tuyn cng b. Quy trnh thi cng tuyn cp, b cp xy dng mi cn tun theo cc bc trong s sau:n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o rnh (II.1)Lp t ng nha, ng chu lc (II.2)Kim tra, nghim thu (I.1.5.4)Lp t rnh cp, b cp (II.3)Xy b cp cc loi (III)Hnh II-1: S thi cng tuyn cp mi o rnhVic o rnh lp t ng HDPE c th c thc hin bng my mc hoc bng th cng. Tit din rnh o ty thuc vo s lng ng s t. Khi xc nh tit din rnh, cn cn nhc tnh kinh t v an ton khi lp t. Phi tun th mi quy trnh an ton sao cho khng xy ra st l v chiu rng rnh nh nht.Chun b mt bng thi cngNhn bn giao mt bng thi cng, chun b mt bng thi cng, thu dn cc chng ngi vt trn mt bng thi cng. Xc nh li v tr, kch thc ca rnh d nh o;o rnh bng myVi iu kin t v a hnh khng qu phc tp, nn s dng my o o rnh. Vic o rnh bng my c thc hin nh sau:Chun b thit b:My o rnh;Cc trang thit b ph tr nh xng, st, ...o rnh:Chia lc lng o rnh thnh tng nhm o cc rnh ni tip nhau sao cho c th lp t ht s ng trong ngy, trnh t st lm hng rnh o;Vn hnh my theo ng hng dn ca nh sn xut, o rnh theo ng thit k;Trong khi o:Thng xuyn kim tra m bo rng rnh o thng, y rnh bng phng d dng lp t ng. c bit, nhng ch khng th o thng th phi m bo cong ca ng v cong ca cp vn nm trong gii hn cho php;Thng xuyn theo di v tr cc cc mc, nu thy cc mc b di chuyn hay b mt th phi tin hnh o c li tht chnh xc ri mi c o; em t o ln cch xa rnh o, nn t 1 bn rnh;Sau khi o xong, kim tra m bo rnh t yu cu k thut;o rnh th cngVic o rnh bng th cng c th thc hin vi mi a hnh nhng bt buc phi p dng trong trng hp rnh cp i gn ng in, cng trnh ngm khc hoc iu kin t phc tp khng th o bng my. Vic o rnh th cng thc hin nh sau:Chun b dng c: quc, xng, x beng (ba), st...o rnh:Quy trnh o rnh bng th cng tng t nh o rnh bng my, ch khc l khng s dng my o m s dng quc, xng, x beng o;Tin hnh o rnh, dng xng ly t ra khi rnh;em t o ln cch xa rnh o, nn t 1 bn rnh;Khi o rnh gn cc cp in, ch c php s dng dng c c cn lm bng g hoc bng vt liu cch in;Sau khi o xong, kim tra m bo rng rnh t cc yu cu k thut.Cc yu cu trong qu trnh o rnhRnh cp phi o ng theo kch thc ca thit k. Trong cc trng hp i trong kt cu ng b hoc qua khu vc c bit su rnh cp c tnh theo thc t. Trong trng hp c bit, khng th o rnh cp v vng cc cng trnh ngm bn di (chn n cao p), c th ng ni ln trn th cn c c lp b tng trm ng hoc trn b mt bo v ng, kch thc b tng ty thuc v tr. y rnh cp phi bng phng, khng nhp nh.Bn knh un cong cho php ln hn 20 ln ng knh ng.p t rnh cp: lp t tng lp dy m bo cht theo thit k ca hng mc giao thng ni t tuyn ng.H o b cp o rng hn kch thc b cp thun li trong qu trnh thi cng xy b v hon thin b.o rnh gn ng cp in ngm ang vn hnh nu khng c php ct in phi c bin php bo m an ton v in cho cng nhn o (dng dng c cch in, c trang phng h cch in, ...) v phi c s gim st trc tip ca c quan qun l ng cp in trong thi gian o.Nu c xy ra s c gy gin on hot ng ca cc cng trnh ngm khc th phi bo ngay cho cp c thm quyn kp thi gii quyt, khc phc.Trong qu trnh o rnh phi tun theo cc yu cu v an ton lao ng ca Nh nc v cc yu cu trong mc I.1.5.5 quy trnh ny.t ng Kim tra rnh cp trc khi lp t ngTrc khi lp t ng HDPE xung rnh, cn phi thc hin kim tra rnh o. Cc cng vic thc hin kim tra bao gm:Kim tra kch thc, chiu di ca rnh theo thit k;Kim tra m bo rng y rnh bng phng, khng c gch hoc nhng vt sc nhn ri xung c th lm hng ng khi lp t;Lp bin bn kim tra rnh, trong ghi li cc s liu sau y:Quy cch rnh cp (su x rng ming x rng y);Chiu di rnh;Cp t o p;Cc ni dung khc. Lp t ng.Lp t ng HDPETrc khi lp t, kim tra khuyt tt do sn xut hoc h hng ca cc ng v m bo khng c t trong ng. Thc hin cc bc:Nu ng c ch ti cng trng dng cun th khi t cn tun th quy trnh sau:Dui thng ng bng cch ln cun ng dc theo rnh.C 3 hoc 4 cng nhn gi ng khng b bin dng.Nu ko m khng ln, ng s b xon. su lp t ng tnh t nh ng ca lp trn cng n mt t phi m bo ng theo thit k.Trc khi lp t ng vo rnh phi m cht y rnh bng lp t mn to nn n nh lp t ng.Trc khi lp t ng tip theo phi lp t rnh cp thnh tng lp bng t, khng c ln bt c vt liu no khc.Sau khi lp t cc ng, trang b cc nt bt bt cc u ng nhm ngn khng nc, bn, t ct... c th xm nhp vo bn trong ng.Lp t ng chu lc caoTrong nhng trng hp cn chu nn cao hn hoc chu nh hng trc tip t mi trng, ty theo yu cu ca thit k c th cn s dng ng chu lc cao. Trng hp s dng ng chu lc cao c th gm: lp t ng qua cu ko cp quang c thc hin bng bin php treo vo lan can cu, treo di gm cu hoc g trc tip vo cu v s dng ng chu lc cao vi kch thc theo thit k c duyt; tuyn ng i qua ng cn s dng ng chu lc cao m bo bn hn. Cc bc thc hin lp t trong trng hp treo trn cao nh sau:Chun b:Vt liu s dng l ng chu lc chng g, ct st, clie gia c ng vo lan can cu, b tng...Dng c thi cng gm: dng c c kh tho, vn bu lng, dy an ton...ng lp t phi c sn 01 dy mi ko ng mm dn cp. i vi cc cu c di ln th c 80-100m t 01 hp KT phc v ko cp. on c th s c 1 lp b tng bo v.Phn ng i qua hai u m cu c c nh vo m cu bng colie, qua cu ng c treo vo dm cu bng cc cli. Hai phn ng ny c lin kt vi nhau bng hp k thut. Vi phn ng treo di dm cu c 100m s phi t 01 hp KT.Hp K thut dng lin kt cc on ng qua cu v c treo vo dm cu .Khi thi cng treo ng qua cu cn phi c dng c v phng n thi cng ph hp m bo cht lng v an ton lao ng. Phn ng i qua cng ngm, hm chui su khng th phi c lp b tng bo v pha bn trn ng.Lp t ngTnh ton sao cho khng phi mi ni trn cu. b tng bo v 2 m u cu v lm 2 b trung gian d tr cp 2 u cu phng khi c s c cu hoc di chuyn, xy dng li cu.i vi nhng cu di (>200 m) cn c phng n d tr cp, phng php bo v ng v bin php thi cng c bit. i vi nhng cu nh v ngn, khng cho php ghp ng vo thnh th c th lm tr i qua.Lp t, hon tr mt bngVic lp t, hon tr mt bng sau khi thi cng tuyn cng b c thc hin nh sau:Sau khi hon thnh cng vic ct, gia c (nu c), tin hnh lp t cho rnh (nu b tng gia c th phi i cho b tng m bo lin kt v kt cu ti thiu 24 gi mi tin hnh lp t); San u t (khng c thnh ng ln vo rnh); Lp t theo tng lp m bo cht theo thit k ca hng mc giao thng ni t tuyn cng b. Khi lp t cc khu vc khng m bo c su yu cu th khi lp t phi thc hin cc bin php bo v c bit (theo thit k); Nhng ch t kh kh m phi dng nc ti trc khi m.Trc khi thi cng mt bng l loi no th phi hon tr thi cng v ng loi mt bng ban u. nhng on qua ng giao thng, khi cha th hon tr nh ban u c ngay th cng phi m hon tr mt bng sao cho cc phng tin giao thng c th i li bnh thng. Khi m phi ti nc cho t ln u v cht. Nu cn thit, phi dng vn g bc qua rnh o m bo an ton cho ngi v xe c.Hon tr mt bng, v sinh mi trng. Nu c t tha phi vn chuyn n ni quy nh.Quy trnh thi cng b cp dc ng cao tc Yu cu chungB cp theo tiu chun TCVN 8700:2011 Cng, b, hm, rnh k thut v t u cp Vin thng Yu cu k thut.Xy dng b cp phi ng theo kch thc ghi trong thit k.Phi m bo an ton trong qu trnh xy dng b.Phi tun th y cng tc xy b cp.B tng thnh b phi t chun mc theo thit k.Mt thnh b phi lng, nhn, khng g gB cp s dng loi b xy gch m bo yu cu ti trng v khng b thm nc.Cc ph kin trong b cp :Ke cp phi lm bng thp m km, c gn c nh vo tng b vi khong cch gia cc ke l 600mm. Khong cch t ke thp nht n y hm l 150mm. Khong cch gia cc lp ke l 230mm. Kch thc v hnh dng ke cp ph thuc vo s lng, kch c ca cp lp t. B tr ke cp theo bn v thit k.Phi b tr b cp nhng v tr thch hp d ra vo, thun li trong qu trnh lp t cp. B cp c l thot nc t nhin 110, thun li cho vic ng cc tip t v th hin r trong Bn v thit k.Np an b cp: phi m bo tun th cc yu cu k thut trong tiu chun TCVN 8700:2011 v cc yu cu sau:Np c dng hnh ch nht, np an trn h c tng din tch b mt khung np khng qu 1m2.Np an phi m bo ngang bng so vi mt t, khng nm chm di mt t t nhin, khng xy chm di rung, vn, khng bp bnh, m bo an ton cho ngi v cc phng tin giao thng c nh qua li, v phi ngn c cht thi rn xung b cp.Gia c lp t khung np: S dng loi b tng c ng lc nn nh nht t 25N/mm2 cho loi b trn h.Phn thp ca khung gm thanh ui c hoc bulng gn vo lp b tng phi c bao ph lp b tng c dy ln hn 20mm v mi pha. Np b theo ng kch thc ghi trong bn v.Tuyn cng b: Tuyn cng b c chn dc theo l ng cao tc v trong gii phn cch gia phi m bo khong cch t mt ng n mt trn ca tuyn ng l 0,6m. Ti cc v tr bng ngang ng phi m bo khong cch t mt ng n mt trn ca tuyn ng l 1,17m.C 4 phng php thi cng b cp: Thi cng bng phng php trc tip, Thi cng bng phng php b tng ti ch, Thi cng bng phng php c sn, Thi cng bng phng php hn hp, c trnh by di y.Thi cng b cp bng phng php trc tipThi cng b cp bng phng php xyPhn ny quy nh quy trnh thi cng vi b, h cp c y bng b tng ti ch, thnh b c xy bng gch, , trn b b tng ti ch.Trnh t thi cng b cp bng phng php xyTrnh t thi cng b cp bng phng php xy nh Hnh IV1:

n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o h (III.2.1.2) b tng y (III.2.1.3)Xy, trt thnh (III.2.1.4)Lp t np b cp (III.2.1.5)Kim tra, nghim thu (I.5.4)Hnh IV1 - Quy trnh thi cng b cp bng phng php xy o h Chun b mt bng thi cng.Thc hin tng t i vi o rnh mc II.1.1.1.o h theo kch thc thit k.Xc nh v tr tim b cp v ng mp b cp, tin hnh cc cng vic cn thit tin hnh o h.Vic o h cng c thc hin bng my hoc bng th cng tng t nh o rnh bng my mc II.1.1.2 v o rnh th cng mc II.1.1.3.Ngoi ra cn phi ch n cc vn :C bin php thot nc ng (k c khi ma to) trnh nc chy vo h o lm st l thnh h o nh:Che y h o, be b chn nc v lm rnh tiu nc, hn ch ti a nc ma chy vo h;C bin php chng nc ngm thm vo h o m bo y h ro nc trc khi tip tc thi cng;o h n mc nc ngm th nn tm ngng o v bm ht nc h o trnh st l v phi c bin php gi n nh vch mi tip tc o;Khi o t nu do iu kin t nhin hay ngoi cnh lm thay i trng thi t nh nn b ngm nc ma ko di, t qu m hay no nc,... phi kim tra li thnh h o, mi dc. Nu khng m bo an ton phi c bin php gia c chng trt, st l t, sp vch chng bt ng nh: gim nghing dc, tm ngng vic ch t kh hoc gia cng vch chng,...Qut sch bn khi h o, gia c y h o cho tht phng v chc chn trc khi b tng. Trong trng hp t ngp ng th phi dng cc ng vo t gia c nn h. Vn chuyn t, v sinh mt bng thi cngThng xuyn dn sch t v vt liu trn ming h phng vt liu ln xung h. t o di y h ln phi vo khu vc, v tr quy nh trong thit k thi cng, nhng phi cch ming h t nht l 0,5 m. t ln ming h o phi c dc t nht l 450 theo mt phng ngang.Khi o cng nh khi vn chuyn t o, hn ch ti a ri vi khng lm nh hng n dn c v cc phng tin giao thng khc. Cc yu cu trong qu trnh o hThc hin tng t nh mc II.1.1.4 . b tng y b cp Chun b, tp kt v kim tra chng loi, khi lng v cht lng cc loi vt t, vt liu (, xi mng, ct, nc,...) v cc my, thit b dng trong qu trnh thi cng.Kim tra kch thc, phng, m cht ca h o (nn h) theo thit k. b tng theo yu cu thit k:Trn b tng theo ng yu cu thit k, mc b tng, khi lng b tng ph hp vi din tch v chiu dy lp b tng theo thit k. Trn va xi mng lng mt trn ca y b theo mc thit k; b tng, m cht, m bo kch thc thit k ( dy, di, rng);Lm rn ng nc ng v tr v kch thc theo thit k;Lng trt b mt y theo yu cu trong thit k.Cn c bin php bo v, khng nc ngp vo b tng khi mi ;Bo dng b tng theo yu cu.Xy thnh b cp, trt hon thinXy thnh b cpSau khi b tng y b xong, phi ch thi gian b tng ng kt theo yu cu thit k mi tin hnh xy thnh b cp.Chun b, tp kt y vt t, vt liu v cc dng c cn thit. Kim tra chng loi, khi lng v cht lng cc loi vt t, vt liu (gch, xi mng, ct, nc,...) theo ng cc yu cu thit k. Va xy phi m bo cc yu cu theo ng thit k. Gch, khi vn chuyn khng c cht ng, khng c thng xung t. Xc nh chnh xc v tr thnh b cp trn y b cp. Xy thnh b cp:Khi xy n v tr phi lp t cc ph kin b cp nh: mc ko cp, gi cp ,... phi chn cc ph kin hoc l ch chn cc ph kin sau, tu theo iu kin cho php.Khi xy n v tr ng nha, phi cha sn v tr trng cho cng tc lp t ng cng sau ny (trong trng hp cha lp t ng cng vo thnh b). Ni, c nh cc ng cng vo thnh b cp (trong trng hp lp t ng cng). Khi cha s dng phi dng cc u bt bt kn cc ng cng li nhm m bo b cp v ng cng sch s v an ton khng cho nc thm vo, khi no ko cp mi tho bt u ra. Khi xy thnh b cp n v tr lp khung b cp, phi xc nh cc v tr ca cc chn khung v cha l trng b tng chn khung.Cc yu cu khi xy:Nhng ch khng quy nh khi xy khng c cc l rng lm yu kt cu thnh b cp;Trong qu trnh xy, khng t thay i thit k. Nu pht hin sai st trong thit k hoc gp nhng hin tng bt thng nh: ct chy, nc ngm mnh, ... phi bo co ngay cho ch u t v c quan thit k kp thi gii quyt. Nu nn t ni xy dng khng ph hp vi nn t theo thit k th n v thi cng phi ngh b sung thit k;Khi xy thnh b cp phi kim tra ngang bng, bng cch o cao cc hng xy; ngang bng ca hng, thng ng ca mt bn v cc gc ca b cp phi c kim tra t nht 2 ln trong mt on cao t 0,5 m n 0,6 m, nu pht hin nghing phi sa ngay;Ch giao nhau, ch ni tip ca thnh b cp phi xy ng thi, khi tm ngng xy phi m git, khng cho php m nanh;Khng va chm mnh, khng vn chuyn, t vt liu, ta dng c, i li trc tip trn thnh b cp ang thi cng, thnh b cp cn mi;Thnh b cp phi m bo nhng nguyn tc k thut thi cng sau: Ngang - bng, ng - thng; mt phng; gc- vung; mch khng trng; thnh mt khi c chc;Va xy phi c cng t yu cu thit k v c do theo st ca cn tiu chun l 9 n 13 mm;Khi xy dng trong ma h hanh kh, gi ty cng nh khi xy dng yu cu mch va phi no v c st 0,14 m. Thnh b cp mi xy phi c che y cn thn, trnh ma nng v phi gi m thng xuyn;Kiu cch xy v cc hng gch ging trong khi xy phi lm theo yu cu ca thit k;Thnh b cp c chiu dy trung bnh ca mch va ngang l 12 mm. Chiu dy tng mch va ngang khng nh hn 8 mm v khng ln hn 15 mm. Chiu dy trung bnh ca mch va ng l 10 mm, chiu dy tng mch va ng khng c nh hn 8 mm v khng c ln hn 15 mm. Cc mch va ng phi so le nhau t nht 50 mm;Trong thnh b cp, nhng hng gch t ngang phi l nhng vin gch nguyn. Khng ph thuc vo kiu xy, cc hng gch ngang ny phi m bo: Xy hng u tin (di cng) v hng sau ht (trn cng); Xy cao trnh thnh b.Phi xy mt ng ca pha tng khng trt bng nhng vin gch nguyn c chc, c la chn mu sc, gc cnh u n. Chiu dy cc mch va theo ng thit k.Khi ngng thi cng do ma bo, phi che kn ton b b cp cho khi b t.Trt hon thin thnh b cpTrt hon thin thnh b cp phi theo ng yu cu trong thit k.Trc khi trt, phi lm sch b mt thnh b cp v ti nc cho m. Khi mt trt va dy hn 8 mm, phi trt lm nhiu lp. Chiu dy mt va trt khng c qu 20 mm. Cc lp trt u phi phng, khi lp trc se mt mi trt lp sau, nu lp trc kh qu th phi ti nc cho m.Phi kim tra bm dnh ca va bng cch g nh trn mt trt, tt c nhng ch bp u phi trt li bng cch ph rng ch ra, mit cht mp va xung quanh, cho se li mi trt sa li.Mt thnh b cp sau khi trt khng c c khe nt, g gh, n chn chim hoc va chy. Phi ch trt cc v tr ti cc gc cnh, ti chn thnh b cp.Lp t khung np, np b cp Np b bng b tng ct thpLp t khung np b cp sao cho mt trn ca khung bng vi mt ng, va h ti v tr lp t. Trc khi b tng khung np b phi kim tra li v tr ca khung np b cp, tin hnh lp vn khun, c nh vn khun theo ng yu cu thit k. Trn b tng theo ng khi lng v mc theo thit k. b tng khung np b cp theo thit k, nn cht b tng, c bit l cc v tr chn khung.Hon thin b mt b tng.Ro chn v tr b cp trnh tai nn xy ra trong thi gian ch b tng gia c khung np b cp ng cng. Sau khi b tng gia c khung np b cp ng cng, lp t np b cp bng b tng ct thp c sn t kn kht vo khung np b cpNp b bng gang cu b tng thnh b cp bng b tng nh i vi trng hp np b bng b tng ct thp mc III.2.1.5.1 Phn D sao cho chiu cao ca thnh b khi lp t np b ngang bng vi mt ng cao tc sau ny; Sau khi b tng thnh b cp ng cng, lp t np gang cu vo thnh b, h sao cho phn khung chu lc ca np gang cu phi nm trn phn b tng thnh b, h cp; b tng gia c np b cp.Thi cng b cp bng phng php b tng ti chPhn ny quy nh quy trnh thi cng vi b cp c y, thnh v trn u c thi cng bng b tng ti ch.Trnh t thi cng b cp bng phng php b tng ti chTrnh t thi cng b cp bng phng php b tng ti ch tng t nh i vi thi cng b, h cp bng phng php xy, c th nh hnh Hnh IV2.

n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o h (III.2.2.2) b tng y (III.2.2.3) b tng thnh b, h cp (III.2.2.4)Lp t np b, h cp (III.2.2.5)Kim tra, nghim thu (I.4.5)Hnh IV2 - Quy trnh thi cng b cp bng phng b tng ti cho hThc hin cc cng vic tng t nh quy nh i vi o h b cp bng phng php xy mc III.2.1.2 . b tng y b cpThc hin cc cng vic tng t nh quy nh i vi b tng y b bng phng php xy mc III.2.1.3. Tuy nhin b cp thi cng bng phng php ti ch yu cu phi thc hin t ct thp y b a ln thnh b. Vic thc hin cng tc b tng nh yu cu ti mc III.2.1.3. b tng thnh b cpSau khi b tng y b phi ch thi gian b tng ng kt theo yu cu thit k mi tin hnh cng tc b tng thnh b theo thit k. Quy trnh thc hin b tng ct thp nh quy nh ti mc III.6.1.Lp t np b cpNp b cp bng b tng ct thpSau khi b tng thnh b lp khung np b ng cng, lp t np b bng b tng ct thp c sn t kn kht vo khung np b Np b bng gang cuThc hin nh lp t np gang cu vo b bng phng php xy mc III.2.1.5.2 .Thi cng b cp c snTrnh t thi cng b cp c snPhn ny quy nh quy trnh thi cng vi b c c sn (bng b tng ct thp hay bng vt liu khc) ti nh my hoc ti ch v c vn chuyn n im tp kt lp t.Trnh t thi cng b c sn nh Hnh V-1:

n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o h (III.3.2)Lp t b, h cp (III.3.3)Lp t np b, h cp (III.3.4)Kim tra, nghim thu (I.4.5)Hnh V1 - Trnh t thi cng b, h cp c sn o h Thc hin cc cng vic tng t nh quy nh i vi o h b cp bng phng php xy mc III.2.1.2.Lp t b cp c snCh c lp t b c sn m bo cht lng (c chng ch xut xng ca nh my sn xut v phiu kim tra sau khi vn chuyn, bo qun, bc xp, ...). Trong phiu kim tra, phi ghi r kch thc hnh hc, cht lng b, h cp c sn, tin cy ca cc mc neo. Tt c cc s liu kim tra u phi ph hp vi thit k.Trc khi lp t b cp phi tin hnh cng tc v sinh, kim tra gm:Lm sch b cp;Kim tra h o, lm sch y h;Kim tra chng loi b, h cp theo thit k;Kim tra hot ng, cht lng ca my mc, thit b, dng c thi cng.Tin hnh lp t b, h cp theo trnh t:Buc dy, mc nng b cp v t vo h;Nu dng cp thp buc nng b h cp th phi t m trnh dp hng b tng, bo v cp khi b h hi;Nu dng mc mc nng b cp th phi m bo s mc bng vi s mc neo c ch to trn b, h cp. Cc mc phi c mc cht vo mc neo m bo khng b tut khi nng b, h cp. Khi nng phi bo m phn phi u ti trng ln b cp. Phi thc hin nng t t khng git, khng o, khng quay kt hp vi dy chng hng cu kin. dn hng b, h cp phi dng dy thng bn c ng knh ln hn 20 mm. Phi dng hai dy dn hng hai u i din;Dy mc phi theo ng tiu chun;Phi t b cp ng v tr thit k. Trong qu trnh lp t, phi thng xuyn kim tra chnh xc lp t b, h cp v xc nh thc t lp t b cp bng my trc c. Cc kt qu kim tra (sau khi c nh) phi c ghi r trong bn v hon cng. Ch cho php tho mc cu sau khi lin kt chc chn b cp 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 ca b cp cho n khi thc hin xong cc lin kt c nh.Trc khi lin kt c nh phi kim tra v tr b cp theo thit k. Cc kt qu kim tra ny phi c ghi trong s nht k lp t.Phi bo qun b cp cn thn trong qu trnh lp t, trnh b h hng. Nhng b cp b hng trong qu trnh lp t, phi c thay th hoc sa cha theo s tho thun ca c quan thit k.Tho g thit b g ch c thc hin sau khi lin kt c nh b cp.Lp t np b cpTng t mc III.2.1.5.Thi cng B cp bng phng php lp ghpTrnh t thi cng b cp bng phng php lp ghpPhn ny quy nh quy trnh thi cng vi b cp c lp t bng phng php lp ghp cc cu kin b tng ct thp (cc cu kin c sn bng vt liu khc thc hin tng t), c c sn ti nh my hoc ti ch v c vn chuyn n im tp kt lp t.Trnh t thi cng b cp bng phng php lp ghp nh Hnh VI-1:

n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o h (III.4.2)Lp t cu kin b tng ct thp (III.4.3)Hn, chng n mn (III.4.4)Chn kn khe h (III.4.5)Lp t np b, h cp (III.4.6)Kim tra, nghim thu (I.4.5)Hnh VI1 - Trnh t thi cng b cp bng phng php lp ghpo h Thc hin cc cng vic tng t nh quy nh i vi o h b, h cp bng phng php xy mc III.2.1.2.Lp ghp cc cu kin b tng ct thp b cp cpCh c lp ghp nhng cu kin b tng ct thp c sn m bo cht lng (c chng ch xut xng ca nh my sn xut v phiu kim tra sau khi vn chuyn, bo qun, bc xp, ...). Trong phiu kim tra, phi ghi r kch thc hnh hc, cht lng cu kin b tng ct thp c sn, tin cy ca cc mc neo. Tt c cc s liu kim tra u phi ph hp vi thit k.Trc khi lp t cu kin b, h cp phi tin hnh cng tc v sinh, kim tra gm:Lm sch cu kin b tng ct thp c sn b cp;Kim tra h o, lm sch y h;Kim tra chng loi cu kin b tng ct thp c sn b cp theo thit k;Kim tra hot ng, cht lng ca my mc, thit b, dng c thi cng.Tin hnh lp t cu kin b tng ct thp c sn b cp phi thc hin t phn phi di n phn pha trn v phi theo theo trnh t:Buc dy, ai mc nng cu kin b tng ct thp c sn b cp v t vo h;Nu dng cp thp buc nng cu kin b tng ct thp c sn b cp th phi t m trnh dp hng b tng, bo v cp khi b h hi;Nu dng mc mc nng cu kin b cp th phi m bo s mc bng vi s mc neo c ch to trn cu kin. Cc mc phi c mc cht vo mc neo m bo khng b tut khi nng;Khi nng phi bo m phn phi u ti trng ln cu kin b tng ct thp c sn. Phi thc hin nng t t khng git, khng o, khng quay kt hp vi dy chng hng cu kin BTCT c sn. dn hng cu kin b tng ct thp c sn phi dng dy thng bn c ng knh ln hn 20 mm. Phi dng hai dy dn hng hai u i din;Dy mc phi theo ng tiu chun;Phi t b cp ng v tr thit k. Trong qu trnh lp t, phi thng xuyn kim tra chnh xc lp t cc cu kin b tng ct thp c sn b, h cp v xc nh thc t lp t b cp bng my trc c. Cc kt qu kim tra (sau khi c nh) phi c ghi r trong bn v hon cng; Ch cho php tho mc cu sau khi lin kt chc chn cu kin b tng ct thp c sn 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 ca cu kin cho n khi thc hin xong cc lin kt c nh;Trc khi lin kt c nh phi kim tra v tr cu kin theo thit k. Cc kt qu kim tra ny phi c ghi trong s nht k lp ghp;Mc v st ca va lp ghp phi do thit k quy nh. Khng cho php s dng va bt u ng kt. Nu lp va m (va lp ghp) trong giai on ng kt, cn phi nng cu kin ln, co sch va c, thay va mi, sau mi c t cu kin;Gii hn x dch thc t ca cu kin lp ghp so vi v tr ca thit k khng c vt qa cc gii hn quy nh trong TCVN 4452: 1987 Kt cu b tng v b tng ct thp lp ghp - Quy phm thi cng v nghim thu (nu trong thit k khng quy nh c th);Phi bo qun cu kin b tng ct thp c sn cn thn trong qu trnh lp ghp, trnh b h hng. Nhng cu kin b tng ct thp c sn b hng trong qu trnh lp ghp, phi thay th hoc sa cha theo s tho thun ca c quan thit k.Hn v chng n mn mi ni v cc chi tit t snCng tc hn mi ni phi tun theo cc ch dn v hn ct thp hin hnh, ng thi phi theo ng quy trnh cng ngh hn quy nh trong thit k thi cng.Xc nh trnh t cng tc hn lp ghp. Phng php hn: trnh t thc hin cc mi ni, ch hn, ng knh v cc que hn, si hn v cc yu cu khc vi vt liu hn.Cng tc hn phi do th hn ( qua o to) thc hin v phi quy nh r th v c im cng tc hn ca loi th .Tt c cc vt liu hn trc khi s dng phi kim tra s b ban u, trong cn kim tra s b gia l lch v vt liu.Loi que hn v mc s hn phi c ch dn trong thit k. Nu khng c ch dn, cn p dng vt liu hn theo hng dn trong cng tc hn ct thp, mi ni v cc chi tit t sn trong quy phm ca Nh nc.Vt liu que hn phi c bo qun trong iu kin chng m, chng bn v cc va p khc. Que hn, si hn, bt hn trc khi hn phi c sy theo ch dn trong cc iu kin k thut v l lch ca chng, phi bo qun ring phn sy vi phn cha sy. Si hn phi c lm sch r, du, m v cc bi bn khc.Que hn, si hn, bt hn c chuyn n ch lm vic ca th hn, theo s lng cn thit, dng trong mt ca. Vt liu hn ni lm vic phi c bo qun kh ro.Cc chi tit hn ca cc cu kin phi c lm sch r c hai mt (khng nh hn 10 mm t ch c b tng).Vic hn dnh cc chi tit lp ghp phi do th hn thc hin. Vt liu hn dnh phi tun theo quy nh s dng vt liu hn hin hnh.Cc mi ni trong qu trnh hn phi c bao che trnh ma, gi, bi, bn.Sau khi hn phi lm sch x hn bm dnh trn mi hn.Kim tra mi hn cn phi thc hin nh sau:Kim tra vt liu hn, iu kin bo qun, sy 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 th hn sau khi xem xt bng mt. Khi c iu kin, c th kim tra cc mi hn bng phng php siu m.Khi kim tra v nghim thu mi hn phi tun theo yu cu v hn ct thp trong xy dng hin hnh ca Nh nc.Vt liu chng r, bin php v trnh t thc hin cc lp chng r cng nh vic bo v lp chng r cn phi c thc hin theo ch dn ca thit k.Trc khi ph lp bo v ln b mt chi tit t sn, mi ni lin kt, mi hn, phi lm sch x, kim loi bm dnh, bi bn, ...Trong qu trnh ph lp bo v phi c bit ch sao cho lp bo v ph kn cc gc cnh ca chi tit.Cht lng lp chng r, lp bo v c kim tra theo quy phm hin hnh ca Nh nc. S liu kim tra phi c ghi vo bin bn nghim thu cng tc khut.Chn kn cc khe h, hon thin cc mi niVic chn kn cc khe h v hon thin cc mi ni phi tin hnh chnh xc, bo m cc yu cu ca thit k v ch c bit nhng vn sau:Bo m bo s lin khi ca mi ni;Bo m cng ca b tng (va) ti khe h v mi ni; chng n mn cc chi tit ni kim loi;m bo chng thm m.Ch c php tin hnh chn kn cc khe h, hon thin cc mi ni khi kim tra v nghim thu nhng cng vic sau y:Bo m cht lng cc chi tit ni cc lin kt hn;Chng r cc mi hn v cc chi tit kim loi.Va chn kn cc khe h v mi ni phi c sn xut bng xi mng ng cng nhanh hoc xi mng poc lng mc 400 tr ln. Mc va c quy nh trong thit k. Trc khi b tng hoc (hoc phun va chn) cn phi kim tra chnh xc ca vn khun, bn ca ging no. Cc mi ni v khe h phi c lm sch khng cn rc bn v phi ti b mt b tng. Nn s dng kh nn hoc nc p lc ra mi ni v khe h.Cng tc b tng chn, m b tng, bo dng b tng, cng tc kim tra cht lng phi tin hnh theo ng nhng quy nh ca thit k v cc quy nh hin hnh.Phi ghi nht k b tng chn kn mi ni khe h. Lp t np b cpTng t mc III.2.1.5.Thi cng b cp bng phng php hn hpNgoi 3 phng php lp t b cp bng phng php trc tip, c sn v lp ghp nh nu trn, vic lp t b, h cp cn c th thc hin bng phng php hn hp. B cp c y ti ch, thnh l b tng c sn, np ti ch Quy trnh thi cng b cp c y ti ch, thnh l b tng c sn, np ti ch Hnh VII-1

n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o h (III.1.2) b tng y (III.2.2.3)Lp t thnh b b tng c sn (III.4.3)Lp t np b, h cp (III.2.2.5)Kim tra, nghim thu (I.4.5)Hn, chng n mn (III.4.4)Chn kn khe h (III.4.5)Hnh VII1- Quy trnh thi cng b cp c y ti ch, thnh l b tng c sn, np ti ch Quy trnh ny tng t quy trnh thi cng b cp bng phng php b tng ti ch, ch khc thay v xy, trt thnh b th y l lp t thnh b bng b tng c sn; hn, chng n mn v chn kn k h nh ti quy trnh thi cng bng phng php lp ghp. Thnh b c c sn v c lp t tng t nh lp t cu kin trong quy trnh lp t bng phng mc lp ghp. Thnh b ch c lp t khi b tng y b c m bo cng theo yu cu.B cp c y ti ch, thnh l b tng c sn, np c sn Quy trnh thi cng b cp c y ti ch, thnh l b tng c sn, np c sn Hnh VI-2

n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o h (III.4.2)Lp t cu kin b tng ct thp (III.4.3)Hn, chng n mn (III.4.4)Chn kn khe h (III.4.5)Lp t np b, h cp (III.4.6)Kim tra, nghim thu (I.4.5) b tng y (III.2.2.3)Hnh VII2 -Quy trnh thi cng b cp c y ti ch, thnh l b tng c sn, np c snQuy trnh ny tng t quy trnh thi cng b cp bng phng php lp ghp, ch khc y c thm cng on b tng y b thc hin nh y b trong quy trnh thi cng b, h cp vic b tng ti phng php b tng ti ch. Thnh b ch c lp t khi b tng y b c m bo cng theo yu cu.

B cp c y c sn, thnh l b tng ti ch, np ti ch Quy trnh thi cng b cp c y c sn, thnh l b tng ti ch, np ti ch Hnh VI-3

n v thi cngn v thit kCh u tCc iu kin thi cng (I.1.5.1)Kho st, lp PA thi cng (I.1.5.2, I.1.5.3)o h (III.4.2)Lp t cu kin b tng ct thp (III.4.3)Hn, chng n mn (III.4.4)Chn kn khe h (III.4.5)Lp t np b, h cp (III.4.6)Kim tra, nghim thu (I.4.5) b tng np b (III.2.1.5)Hnh VII3 - Quy trnh thi cng b cp c y c sn, thnh l b tng ti ch, np ti ch Quy trnh ny tng t quy trnh thi cng b cp bng phng php lp ghp, ch khc c thm bc b tng np b nh i vi quy trnh thi cng b, h cp bng phng php xyCc phng php ny ch khc nhau phn trin khai thi cng b, h v c thc hin kt hp ca cc phng php nu trn. Cc phn khc thc hin ging nh cc phng php khc.Ngoi ra c th c cc phng php kt hp khc thi cng b cp. Ty theo phng php la chn, cc bc thc hin s thc hin trn c s kt hp ca 3 phng php lp t b cp bng phng php trc tip, c sn v lp ghp nh nu trn.Mt s cng tc chung khi thi cng b cp Thi cng b tng ct thpLp dng cp phaCng tc lp dng ct pha phi m bo:Cc khe ni cc vn khun phi kn nc v xi mng khng chy r ra ngoi khi b tng;Mt trong ca ca vn khun cn bo s mt b tng c nhn;Phi lt giy, ct, qut nc vi hay du trc khi b tng;Thnh vn khun ngoi cao hn mt ng ti thiu 700 mm trnh t ct gch vn ri vo khi xe c di chuyn ngang qua;Khi t vn khun ghp cp pha cho php sai lch theo tiu chun quy nh;Vn khun em dng li phi co ra tht sch ht va, xi mng dnh bm trn mt vn;Vn khun gia cng xong phi c bo qun trnh nt n, cong vnh mc mt v sp xp theo th t tin dng.t ct thpCt thp c thc hin phi m bo:Ct thp phi c cng ng vi thit k;Phi t v ng cc loi ct thp;Khng d tr qu nhiu ct thp trn sn cng tc;Khi t ct thp bn cnh hay bn di ng dy in lc cn c bin php trnh cho ct thp va chm vi ng dy in lc;Cn co r, lm sch ct thp trc khi lp t;Cc cng tc ct, un, hn, ni, buc phn b ct thp phi thc hin theo s hng dn ca cn b k thut c chuyn mn v xy dng;Sau khi t ct thp, phi tin hnh nghim thu ct thp;Nghim thu ct thp l kim tra cc kch thc ca ct thp theo ng bn v thit k; kim tra v tr v cch t ct thp; kim tra vng trc v nh ca khung ct thp m bo khng dch chuyn v bin dng khi v m b tng. Thi cng b tngCh to hn hp b tngXi mng, ct, dm hoc si v cc cht ph gia lng ch to hn hp b tng c cn theo khi lng. Nc v cht ph gia cn ong theo th tch. Sai s cho php khi cn, ong khng c vt qu cc tr s quy nh.Ct ra xong, phi kh ro mi tin hnh cn ong nhm gim lng nc ngm trong ct. chnh xc ca thit b cn ong phi c kim tra trc mi t b tng. Trong qu trnh cn ong thng xuyn theo di khc phc kp thi. Hn hp b tng cn c trn bng my. Ch khi no khi lng t mi trn bng tay.Vic chn bng my phi tun th theo quy trnh hng dn s dng my.Nu trn b tng bng th cng th sn trn phi cng, sch v khng ht nc. Trc khi trn cn ti m sn trn chng ht nc t hn hp b tng. Th t trn hn hp bng th cng nh sau: trn u ct v xi mng, sau cho v trn u thnh hn hp kh, cui cng cho nc v trn u cho n khi c hn hp ng mu v c st nh quy nh.Vn chuyn hn hp b tngVn chuyn hn hp b tng t ni trn n ni cn cn m bo cc yu cu sau:S dng phng tin vn chuyn hp l, trnh b tng b phn tng, b chy nc xi mng v b mt nc do gi nng;S dng thit b, nhn lc v phng tin vn chuyn cn b tr ph hp vi khi lng, tc trn, v m b tng;Thi gian cho php lu b tng trong qu trnh vn chuyn cn c xc nh bng th nghim trn c s iu kin thi tit, loi xi mng v loi ph gia s dng. Nu khng c cc s liu th nghim c th tham kho cc tr s trong Bng VIII1.Bng VIII1 - Thi gian lu hn hp b tng khng c ph giaNhit (0C)Thi gian vn chuyn cho php ti a, pht

Ln hn 30 30

20 - 3045

10- 2060

5 - 1090

Vn chuyn hn hp b tng bng th cng ch p dng vi c ly khng qu 200 m. Nu hn hp b tng b phn tng cn trn li trc khi .Khi dng thng treo vn chuyn hn hp b tng th hn hp b tng vo thng treo khng vt qu 90- 95 % dung tch ca thng.Vn chuyn hn hp b tng bng t hoc thit b chuyn dng cn m bo cc quy nh trn v cc yu cu sau:Chiu dy lp b tng trong thng xe cn thp hn thnh thng m bo khng ri ra ngoi nu dng t ben t ;Nu vn chuyn bng thit b chuyn dng va i va trn th cng ngh vn chuyn c xc nh theo cc thng s k thut ca thit b s dng. Khi dng my bm vn chuyn phi m bo cc yu cu sau:Thnh phn v st ca hn hp b tng cn c th nghim v bm th nhm m bo cht lng b tng v iu kin thi cng, ng thi ph hp vi tnh nng k thut ca thit b bm;Khi thi cng trong thi tit nng, mt ngoi ng cn che ph hoc sn trng hn ch bc x mt tri lm nng b tng;Khi vn chuyn b tng bng bng chuyn, phi m bo cc yu cu di y:Cu to mt lm vic ca bng chuyn theo dng hnh mng v dng loi bng chuyn cao su. Bng truyn dng phng ch s dng khi chiu di ng vn chuyn di 200 m;Gc nghing ca bng chuyn khng vt qu cc gi tr bng 5.9. Mt bng chuyn phi nghing u, khng gp gy t ngt;Tc vn chuyn ca bng chuyn khng c vt qu 1m/s. Tc vn chuyn ca cc bng chuyn trong h thng khng chnh lch nhau qu 0,1 m/s; b tng vo bng chuyn c thc hin qua phu hoc mng hn hp b tng c ri u v lin tc trn bng chuyn. Chiu dy ca lp b tng trn bng truyn ph thuc vo sc chu ti cho php ca tng loi bng chuyn;B tng chuyn t bng chuyn ny sang bng chuyn khc hoc t bng chuyn vo cp pha cn thc hin qua ng phu hng hn hp b tng ri thng ng Bng VIII2.Bng VIII2 - Gc nghing gii hn ca bng chuyn, st, (mm)Khi vn chuyn b tng ln caoKhi vn chuyn b tng xung thp

Nh hn 401512

40 - 801510

v m b tng1. b tng:Phi tin hnh nghim thu ct thp v vn khun trc khi tin hnh b tng.Vic b tng phi m bo cc yu cu:Khng lm sai lch v tr ct thp, v tr cp pha v chiu dy lp b tng bo v ct thp;Khng dng m di dch chuyn ngang b tng trong cp pha;B tng phi c lin tc cho ti khi hon thnh mt kt cu no theo quy nh ca thit k. trnh s phn tng, chiu cao ri t do ca hn hp b tng khi b tng khng vt qu 1,5 m;Khi b tng c chiu cao ri t do ln hn 1,5 m phi dng mng nghing hoc ng vi voi. Khi dng ng vi voi th th ng lch nghing so vi phng thng ng khng c qu 0,25 m trn 1 m 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 b tng ri thng ng vo v tr v thng xuyn v sinh sch s va xi mng trong lng mng nghing;Khi b tng cn m bo cc yu cu:Gim st cht ch hin trng cp pha v ct thp trong trong qu trnh thi cng c th 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 b tng mi gy ra; nhng v tr m cu to ct thp v cp pha khng cho php m my mi m th cng;Khi tri ma phi che chn, khng nc ma ri vo b tng. Trong trng hp ngng b tng qu thi gian quy nh, phi i n khi b tng t cng 25 daN/ cm2 mi c b tng, trc khi b tng phi x l lm nhm b mt. b tng vo ban m v khi khi c sng m m bo nh sng ni trn v b tng.Khi b tng phi tun theo trnh t, thc hin ng quy nh b phn no trc, b phn no sau theo hng dn ca cn b k thut, khng lm tu tin, tri quy nh:Khi m b tng ch khng mi di chm vo ct thp;Khi v m b tng phi ch khng lm sai lch v tr ct thp. Nu ct thp b cong hay bp phi nm, sa li trc khi b tng;Phi lin tc b tng lin tc, khng ngt qung;Nu thi cng vo ma h, khi nhit khng kh ln hn 300C khng c dng b tng.Vo ma h phi ti nc lm m vn khun trc khi b tng;Chiu dy mi lp b tng phi phi cn c vo nng lc trn, c ly vn chuyn, kh nng m, tnh cht ca kt cu v iu kin thi tit quyt nh nhng khng c vt qu cc tr s ghi trong Bng VIII3.Bng VIII3 - Chiu dy lp b tngPhng php mChiu dy cho php mi lp b tng, cm

m di1,25 chiu di phn cng tc ca m (khong 20 n 40 cm)

m mt- Kt cu khng c ct thp v kt cu c ct thp n- Kt cu ct thp kp20

12

m th cng20

m b tngVic m b tng phi m bo cc yu cu sau:C th dng cc loi m khc nhau, nhng phi m bo sau khi m b tng c m cht v khng b r;Thi gian m ti mi v tr phi m bo cho b tng c m k. Du hiu nhn bit b tng 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 di khng vt qu 1,5 bn knh tc dng ca m v phi cm su vo lp b tng trc 10 cm;Khng m li b tng.Bo dng b tngSau khi , b tng phi c bo dng trong iu kin c m v nhit cn thit ng rn v ngn nga cc nh hng c hi trong qu trnh ng rn ca b tng.Bo dng m:Bo dng m l qu trnh gi cho b tng c m cn thit ng kt v ng rn sau khi to hnh. Phng php v quy trnh bo dng m thc hin theo TCVN 5592: 1991 "B tng nng- Yu cu bo dng m t nhin";Tho d vn khunCp pha ch c tho d khi b tng t c 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 cp pha cn trnh khng gy ng sut t ngt hoc va chm mnh lm h hi n kt cu b tng.Cc b phn cp pha khng cn chu lc sau khi b tng ng rn (nh cp pha thnh hm cp) c th c tho d khi b tng t cng trn 50 daN/cm2.Hon thin b mt b tngTrong mi trng hp, b mt b tng phi c hon thin tho mn yu cu v cht lng, phng v ng u v mu sc theo quy nh ca thit k.Vic hon thin b mt b tng c chia lm hai cp: Hon thin thng thng: Sau khi tho cp pha, b mt b tng phi c sa cha cc khuyt tt v hon thin m bo phng, nhn v ng u v mu sc. Mc g gh ca b mt b tng khi o p st bng thc 2 m khng c vt qu 7 mm;Hon thin cp cao: Hon thin cp cao i hi phng nhn khi kim tra bng thc 2 m, g gh khng c vt qu 5 mm v phi m bo ng u v mu sc.Thi cng b tng trong thi thit nng v ma maVic thi cng b tng trong thi tit nng c thc hin khi nhit mi trng cao hn 300C. Cn p dng cc bin php phng nga v x l thch hp i vi vt liu, qu trnh trn, , m v bo dng b tng khng lm tn hi n cht lng b tng do nhit cao ca mi trng gy ra.Nht ca hn hp b tng t my trn nn khng ch khng ln hn 300C v khi khng ln hn 350C;Vic khng ch nhit hn hp b tng c th cn c vo iu kin thc t p dng nh sau:Dng nc mt h thp nhit ct liu ln trc khi trn, dng nc mt trn v bo dng b tng;Thit b, phng tin thi cng, bi ct , ni trn v ni b tng cn c che nng;Dng xi mng t to nhit;Dng ph gia ho do c c tnh ph hp vi mi trng nhit cao; b tng vo ban m hoc sng sm v khng nn thi cng b tng vo nhng ngy c nhit trn 350C.Thi cng b tng trong ma ma cn m bo cc yu cu sau:Phi c cc bin php thot nc cho bi ct, , ng vn chuyn, ni trn v ni b tng;Tng cng cng tc th nghim xc nh m ca ct liu kp thi iu chnh lng nc trn, m bo gi nguyn t l nc/xi mng theo ng thnh phn chn;Cn c mi che chn trn hm cp khi tin hnh thi cng di tri ma.Va xy dngVa dng trong thi cng hm cp phi c mc v cc ch tiu k thut tun theo yu cu thit k cng nh cc quy nh trong tiu chun TCVN 4459:1987 Hng dn pha trn v s dng va xy dng.Vt liu dng sn xut va (cht kt dnh, ct liu) phi m bo yu cu v tiu chun k thut. Nc dng pha trn va khng c cha tp cht c hi lm cn tr qu trnh ng cng ca cht kt dnh. Khi dng nc ngm ti ch hoc nc ca h thng k thut trn va, phi phn tch bng th nghim, nu ly nc trong h thng cp nc sinh hot th khng cn kim tra.Cc loi cht kt dnh dng sn xut va xy cho cc kt cu di nn t c nc xm thc, phi tun theo ch dn ca thit k. Khi xy gch, di mc nc ngm hoc trong t m bo ho nc, phi dng va ng cng trong nc.Hn hp va kh do nh my sn xut phi c ch dn thnh phn v mc va t c sau khi trn va. Khi vn chuyn hn hp va kh, cn bo qun trnh m t, bay hi v b bn.Ch to np b cp bng b tng ct thpCh to np b cp bng b tng ct thp phi tun theo cc yu cu trong tiu chun ngnh v hm h cp, cc yu cu trong thit k, TCVN 4453: 1995 "Kt cu b tng v b tng ct thp ton khi - Quy phm thi cng v nghim thu". B tr mt bng sn xut: cc bn trn b tng; bi b tng; bi cha b tng trong thi gian bo dng; xng gia cng khung np b cp, gia cng ct thp; ..., phi hp l theo quy trnh sn xut. Chun b v kim tra vt t, vt liu: st, thp, xi mng, , si, ct, nc, ... p ng v s lng v cht lng theo thit k.Gia cng, hn khung np v nghim thu theo ng yu cu k thut trong thit k. Dng dy thp buc c nh cc im giao nhau gia thp cu to v thp chu lc ng thi dng my hn hn 100 % cc im tip xc gia cc thanh thp chu lc v thp cu to vi khung np hm h cp, sau nh sch r ton b khung np ri mi tin hnh b tng;Kim tra bng phng gia khung b v khung np b trc khi b tng np b. b tng:Sn xut b tng ng cht lng, ng mc theo quy nh trong thit k. Cc vt liu nh: xi mng, ct, , nc, vt liu n v cht ph gia phi c o lng ng t l cho tng m trn;B tng phi c trn u bng my ng thi gian quy nh (t 1 n 2 pht), theo trnh t: trc ht 15 % n 20 % lng nc, sau xi mng, ct, , cng mt lc, ng thi dn dn v lin tc phn cn li;Ly mu th, kim tra cht lng b tng theo tng t sn xut, ghi nhn ngy sn xut ln tng mu th, lu gi mu th;Vn chuyn v b tng bng c gii hoc bng bng chuyn n ni b tng, m bo thi gian ngn nht nhm trnh hin tng phn tng v tht thot b tng dc ng;Sau khi b tng np b cp phi c bin php che chn trnh ma, bi b tng phi c h thng tiu thot nc tt.Bo dng b tng: Gi ch nhit m thch hp ng quy nh trong sut thi gian bo dng bng cch ti nc trc tip hoc bao bc b tng bng bao ti thm nc. Thi gian bo dng ph thuc vo nhit mi trng (ma lnh bo dng ngn ngy, ma h bo dng di ngy): t 3 n 7 ngy i vi xi mng ng kt nhanh (c cht ph gia), t 7 n 14 ngy i vi xi mng poc lng, n 28 ngy vi xi mng Pu d lng. Trong thi gian bo dng trnh lm rung ng va chm vo np b cp.Kim tra, nghim thu np b cp trc khi vn chuyn ra cng trng lp t. i chiu cc thng s k thut sn phm theo ng thit k k thut.

Cc yu cu hn ni, lp t ph kin, bin boCc yu cu hn ni ng HDPE t hpQu trnh ni ng HDPE t hp nh sau: Tho b lp bo h ng. Ct b ng bn ngoi Chnh sa ng bn trong C nh ng bn trong Lp ng ni ca ng trong Lp gioong chng nc bn ngoi Lp np y vo ng ngoi Ni ng hon ttTho b lp bo h ng

Ct b ng bn ngoi

Chnh sa ng bn trong

C nh ng bn trong

Lp ng ni ca ng bn trong

Lp gioong chng nc bn ngoi

Lp np y vo ng ngoi Ni ng hon tt

Cc yu cu hn ni ng HDPE xonPh kin ni ng HDPE xon tun th theo Tiu chun TCVN 8699:2011 Mng vin thng - ng nha dng cho tuyn cp ngm Yu cu k thut/2011.Quy trnh ni ng HDPE xon nh sau:Bc 1: Vn ht c ph kin ni ng (mng sng) vo u ng cn ni theo chiu kim ng h, sau dng ca ct np y ca mng sng .

Bc 2: nh du trn ng cn ni cn li sao cho khong cch t u ng ti im nh du bng mt na chiu di mng sng.

Bc 3: t thng hng cc u ng, u ca ng th hai st vi mng sng. Xoay mng sng ngc chiu kim ng h cho ti im nh du.

Bc 4: Dng bng cao su non qun cht khe tip gip gia mng sng v hai ng c ni.

Bc 5: Dng bng cao su lu ha qun bao quanh ngoi phn cao su non.

Bc 6: Cui cng, dng bng keo PVC chu nc qun tip mt ln na ra ngoi cng.

Lp t bin boTi cc cng b cp, ti v tr no, v v tr ni cp, tuyn cp phi c treo bin bo nhn din cp theo ng bn v s t chc mng vin thng, s mt bng chi tit. Bin bo nhn din cp c treo c nh vo b cp, th ny c kch thc v mu sc thng nht nh sau: Vt liu ch to: Mica hoc kim loi. Ni dung ghi trn bin bo: Ghi theo th t t trn xung, gm: Loi cp: Cp quang. Dung lng cp. Tn n v ch qun: Vit tt tn n v. S in thoi lin h. Mu nn v mu ch trn th: Vin thng xxxx (VNPT): Nn trng, ch xanh. Trong trng hp n v c cp vin thng phc v mc ch an ninh, quc phng cn gi b mt, n v c th m ha hoc dng cc k hiu mu sc khc th hin cc thng tin. K hiu khc ny c ban hnh di dng bo mt v ch nhng ngi c trch nhim c bit.

PH LC(Tham kho)1. Khong cch nh nht gia ng cng cp v cc cng trnh ngm khc nh sau (m)Loi ng ng ng ng nc, f(mm)Cng nc thing kh gas, xng duCp in lc

< 300300500> 500

Song song11,5210,60,6

Giao cho0,250,250,250,250,30,5

Ghi ch:+ i vi cc cng trnh ngm c sn, khi thi cng tuyn cng b gn phi tun theo quy nh v khong cch an ton ca nhng n v ch qun nhng cng trnh ny nu nh yu cu khong cch cao hn trong bng.+ Khi giao cho qua cp in lc, cp thng tin phi i bn trn cp in lc. Trng hp mt trong hai cp c v bc bng kim loi hoc c t trong ng kim loi th khong cch ti ch giao cho c th gim xung 0,25m.+ Trong trng hp c bit khng th t c khong cch song song vi cp in lc nh quy nh trong bng ny, cho php gim khang cch xung 0,25m i vi cp in c p n 10 KV, i vi cp in lc ln hn 10 KV th cho php khong cch gim xung 0,25m nhng mt trong hai cp phi t trong ng kim loi. 2. Khong cch nh nht gia ng cng cp vi ng st v ng xe in (m)Loi ngng st (m)ng xe in (m)

Song song12

Giao cho1,21,1

Ghi ch :+ Khong cch song song ca ng cng cp vi ng st c tnh t tuyn cp chn vi chn taluy ng st.+ Qua ng st v ng xe in, cp ng v cp quang phi c t trong ng thp hoc ng nha bc b tng di ra v hai pha so vi ng ray ngoi cng mi bn ti thiu l 3m. + Trong trng hp c bit phi tun theo quy nh v khong cch an ton ca n v ch qun nhng cng trnh ny nu nh yu cu khong cch cao hn trong bng.3. Khong cch nh nht gia ng cng cp vi cc kin trc ngm khc (m)Loi kin trcSong songGiao cho

Cng cp thng tin0,50,25

Ct in, in thoi0,5

B va h1,0

Mng cu vt, tunnel0,6

Mng tng, hn ro1,0

4. Khong cch ca tuyn cp ngm vi cc cng trnh kin trc khc :

TPhng thcLoi kin trc

ng dn nc vi ng knh (mm)Cng nc Cp in lc ngm

300300500 500 35 KV 35 KV

1Song song (m) 1m 1,5m 2m 1m0,5m2,0m

2Cho nhau (m) 0,5m 0,5m 0,5m 0,5m0,5m0,5m

5. Khong cch ca tuyn cp chn trc tip vi cc cng trnh kin trc khc :

TTPhng thc

Song songCho nhau

Nh nhtc bitNh nhtc bit

1ng cng in thoi10,50,250,1

2ng dy thu li cc loi2,50,5

3H nc bn3

4Cc loi ct n1,51