n Tt Nghip Khoa Xy Dng Cu - ngSVTH: Nguyn Vn Tu_Lp 02X3BTrang 190PHN IIITHIT K T CHC THI CNG MT NG (35%)(KM1+00 KM2+00 PHNG N I) n Tt Nghip Khoa Xy Dng Cu - ngCHNG ITHIT K T CHC THI CNG TNG TH1.GII THIU CHUNG V ON TUYN: on tuyn thit k k thut thi cng t KM1+00,00 n KM2+00,00. on tuyn c dc ngang sn tng i nh t 27%, c mt cng trnh thot nc cng hp BTCT 2H250 ti KM1+300,00. Trn bnh c b tr mt phn ca ng cong nm c R = 1600m. Trong on tuyn c 1 on nn ng dng o hon ton vi chiu cao o ln nht 3,55m v 1 on nn ng dng p hon ton vi chiu cao p ln nht l 3,36m (ti v tr t cng), on chuyn tip ca hai dng nn ng trn l dng nn na o na p.2.XC NH CC TNH CHT V IU KIN THI CNG:2.1 iu kint nhin khu vc tuyn i qua:2.1.1a hnh - a mo:y l vng i, trong khu vc tuyn i qua, rng ch yu l rng tha, gm cc loi i sim, c tranh, cy l nh, cy bi thp v c cc i trng bch n, keo... Rng cy con, mt cy con, dy leo chim di 2/3 din tch v c 100m2 rng c t 5 n 25 cy thng c ng knh t 5 n 10cm v xen ln cy trm c ng knh ln hn 10cm.( rng loi II)a hnh khu vc tuyn tng i bng phng v kh rng thun li cho vic tp kt vt liu.2.1.2a cht:iu kin a cht ni tuyn i qua kh n nh, khng c hin tng st l hay nc ngm l thin. Lp trn l lp t ln hu c dy 10 20cm; bn di l lp t st ln si sn, rt thun li cho vic p nn ng, c chiu dy trung bnh t 4 6m; lp tip theo l lp st th dy trung bnh t 1.-1,5m; di cng l lp gc.t ai trong khu vc ch yu dng cho trng trt nn vic n b v gii ta rt thun li.2.1.3 a cht thy vn: Tnh hnh ma trong khu vc tuyn khng u, theo h s ca cc trm o ma trong khu vc th lng ma ln nht ng vi tn sut thit k P = 4% l 365mm/ngy. Ma ma tp trung vo 4 thng cui nm, bt u t thng 9 kt thc vo thng 12. Do nhng thng thun li cho thi cng l t thng 2 n thng 7 hng nm.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 191 n Tt Nghip Khoa Xy Dng Cu - ngQua kho st cho thy tnh hnh a cht thy vn trong khu vc hot ng t bin i, mcncngmhotngthprt thunlichovicxydngtuynng, khng c hin tng cxt. Kt qu th nghim cho thy nc y c pH=7,5 hm lng mui ha tan trong nc rt t, khi khng c ma l ln th hm lng ph sa, rc bn t. Do c th dng c cho thi cng v sinh hot ca cng nhn. 2.1.4iu kin kh hu: Khu vc tuyn i qua mang c trng ca kh hu min Trung chu nh hng ca hai ma gi. Ma ng vi gi ng Bc, ma lnh. Ma h vi gi Ty Nam kh hanh. Ma kh t thng 2 n thng 8, ma ma ko di t thng 9 n thng 12. Theo s liu thng k nhiu nm cho thy:- Nhit trung bnh hng nm : 25,60C.- Nhit cao nht trong nm : 380C.- Nhit thp nht trong nm : 9,00C. Vi iu kin kh hu khu vc tuyn i qua thuc khu vc nhit i gi ma, m cao. Thi gian thi cng thun li nht l t thng 2 n thng 7.2.1.5iu kin vn chuyn:Do tuyn trc y c ng mn sn dc tuyn, ta ch cn m rng v to mt bng. Do vic vn chuyn v tp kt vt liu nhn cng my mc rt thun li trong sut qu trnh thi cng.2.2iu kin x hi v cc iu kin lin quan khc:2.2.1iu kin phn b dn c:y l tuyn ng nm trung du gip ranh gia ng bng v vng ni, cho nn dn c sng 2 bn tuyn khng ng c, tp trung ch yu hai u tuyn v ch yu l dn tc kinh. Nh ca rung vn ca dn nm xa ch gii xy dng.2.2.2iu kin khai thc, cung cp nguyn vt liu v bn thnh phm:t p nn ng, qua kim tra cht lng cho thy c th ly t t nn ng. o t nn o sang p nn p hoc ly t tthng u p, ngoi ra c th ly t ti cc v tr m dc tuyn vi c ly trung bnh l: 5km. Tuy nhin t o trong on tuyn m bo khi lng cho vic p nn ng.Ximng, st thp ly ti cc i l vt t khu vc thnh ph Nng (c ly 12km).B tng nha ng ly ti trm trn b tng nha Ho Cm (c ly 10km). cc loi ly ti m Phc Tng (c ly vn chuyn 10Km).Ct, sn ly ti m di chn Cu hoc ti m ct Tu Loan (c ly 5 12Km).Cc bn thnh phm v cu kin c sn c sn xut ti x nghip phc v cng trnh, x nghip ng trn a bn thnh ph Nng cch chn cng trnh 5 12 km. SVTH: Nguyn Vn Tu_Lp 02X3BTrang 192 n Tt Nghip Khoa Xy Dng Cu - ngNng lc sn xut ca xng p ng y v s lng, cht lng theo yu cu t ra.2.2.3 iu kin cung cp nhn lc, xe my, in nc v cch a cc phng tin thi cng n cng trng:n v thi cng c i ng cn b k thut v cng nhn c trnh v tay ngh cao, c kh nng m bo thi cng cng trnh ng tin . Nhng cng vic cn nhiu lao ng th cng th c th thu nhn lc nhn ri a phng, to cng n vic lm cho ngi dn , mt khc cng c th gim gi thnh xy dng cng trnh.Tiukin a hnh khu vc, my mc c iu ng n hin trng ch yu l t hnh tp trung v chn cng trnh. Cc x ven tuyn c in phc v cho sinh hot v sn xut do rt thun li cho vic s dng nng lng thi cng. 2.2.4 iu kin v thng tin lin lc v y t:Hin nay, h thng thng tin lin lc, y t xung n cp huyn, x. Cc bu in vn ha ca x c hnh thnh gp phn a thng tin lin lc v thn xp ng nhu cu ca nhn dn. y l iu kin thun li cho cng tc thi cng, gim st thi cng, to iu kin rt ngn khong cch gia ban ch huy cng trng v cc ban ngnh c lin quan. Ti cc x ca huyn u c trm y t gii quyt vn s cp cu nu c tai nn lao ng xy ra.3.C IM CA KCA, PHNG PHP T CHC THI CNG:3.1. c im v tnh cht cng trnh mt ng n v m nhim thi cng:Kt cu mt ng n v m nhim thi cng l mt kt cu mt ng mm cp cao ch yu A1 (theo TCVN4054-2005 v 22TCN211-06), c kt cu cht kn. Tng b dy mt ng mm l 45cm, gm cc lp vt liu c th nh sau:Bng III.1.1: Cc lp kt cu o ng.Tn lp Loi vt liu Chiu dy hi (cm)Lp 4 BTN Cht loi I ht trung Dmax20 5Lp 3 BTN Cht loi II ht ln Dmax25 7Lp 2 CPD loi I Dmax 25 15Lp 1 CPD loi I Dmax 37,5 18SVTH: Nguyn Vn Tu_Lp 02X3BTrang 193KETCAUAONG, LEGIACOEyc =168MPaatnenK98, E 0 =57MPa4321181575 n Tt Nghip Khoa Xy Dng Cu - ngHnh III.1.1-Kt cu o ng.3.2 c im ca cng trnh mt ng:Din thi cng hp v di: mt ng gm c phn l gia c c kt cu ging kt cu phn xe chy (t y ni n kt cu o ng ta hiu nh gm c hai phn trn) c tng b rng l 2 3,5+2 0,5 = 8,0m tuy nhin ko di n 1,0km. Do vy cng tc t chc qun l, kim tra, iu hnh sn xut, b tr lc lng thi cng tng i kh khn, khi lng cng tc vn chuyn phn b khng u, nhu cu v xe vn chuyn thay i theo tng on. Ngoi ra cn gy hn ch v vic cung ng my mc v nhn vt lc cng nh pht huy nng sut my mc.Khi lng cng trnh mt ng phn b trn ton tuyn tng i u do kt cu mt ng khng thay i. Do khi lng vt liu yu cu v khi lng cng tc thi cng (tr khu vn chuyn), phn b tng i u v t chc ca cc n v cng tc (t, i) tng i n nh, tc thi cng thng khng thay i. iu ny c ngha rt quan trng trong cng tc chn phng php t chc thi cng v cc bin php nng cao nng sut ca my mc.Cng tc thi cng phi tin hnh hu ht ngoi tri nn ph thuc nhiu vo iu kin thin nhin, nht l iu kin kh hu : ma, nng, gi, nhit , m. Tri ma khng th tin hnh thi cng ni chung v cc lp btng nha c bit cn ch . Ngoi ra tnh hnh thi tit bt li cn gy ra tr ngi chung cho ton b qu trnh thi cng v tc ng n tin thi cng chung ca cng trnh mt ng.Ni lm vic ca n v thi cng thng xuyn thay i: Sn phm lm ra th c nh, cn n v thi cng phi di chuyn thng xuyn trn tuyn hon thnh ng cc khi lng cng tc ca mnh, nn phi t chc di chuyn, i sng cn b, cng nhn cng trng gp nhiu kh khn v vn b tr ch n cho cng nhn cn b k thut, cho vic b tr cc kho tng sa cha my mc. Tuy nhin ta ch thit k t chc thi cng trong on tuyn di 1Km th vn ny khng cn quan trng, cc kho tng bn bi c th tp trung vo gia on tuyn l c th phn b sut dc on tuyn thun li, cng tc di chuyn khng kh khn cho c cng nhn v my mc.3.3 c im ca kt cu mt ng: Kt cu mt ng mm: Mt ng mm thng gm c lp mt v lp mng.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 194 n Tt Nghip Khoa Xy Dng Cu - ng+ Lp mt l b phn chu trc tip tc dng ca xe chy (lc thng ng v lc ngang) v tc dng ca ma nng, nhit ...,lp mt trn cn chu tc dng xung kch, x trt, mi mn...+ Lp mng ch chu lc thng ng. Nhim v ca tng mng l truyn v phn b lc thng ng khi truyn n nn t th ng sut s gim n mt mc t nn ng c th chu c m khng to nn bin dng thng ng hoc bin dng trc qu ln.Cc lp BTN v lp cp phi dm : hnh thnh cng theo nguyn l cp phi. Ct liu l dm hoc si sn c kch c to nh khc nhau c phi hp vi nhau theo t l nht nh v vy sau khi san ri v lu ln cht cc ht nh lp y l rng cn li gia cc ht ln to thnh kt cu c chc kn nc c cng cao c kh nng chu lc thng ng lc ngang u ttLoi mt ng s dng nguyn l ny c kt cu cht kn hn ch c ncthm qua khi cp phi s dng cht lin kt s to thnh cc loi mt ng cp cao v vy hin nay hu ht cc kt cu mt ng cp cao hin nay u s dng nguyn l ny. c im cc lp mt ng:3.3.1 Lp mt: Btng nha.a) Chc nng: mt ng btng nha cht loi I l mt ng cp cao ch yu, chu tc dng trc tip ca hot ti thng ng v c lc ngang, ng thi cng l lp chu tc dng trc tip ca cc iu kin kh hu, thi tit. b) Nguyn l s dng vt liu: Btng nha l loi mt ng s dng theo nguyn l cp phi.c) Nguyn l hnh thnh cng : Cng mt ng hnh thnh bi cc yu t sau:- Lc ma st: Do ln, ng u v sc cnh ca cc ht ct liu quyt nh. Lc ma st t thay i khi nhit v thi gian tc dng ca ti trng thay i, nhng s gim nhiu khi hm lng nha tng.- Thnh phn lc dnh trong btng nha, y l thnh phn rt quan trng to nn cng v tnh n nh cng ca btng nha bao gm hai thnh phn chnh+ Thnh phn lc dnh tng h: Do s mc vn gia cc ht khi dch chuyn gy ra, khi vt liu cng ln, cng sc cnh th thnh phn ny cng tng. Lc dnh tng h t thay i theo nhit , m v tc bin dng, nhng s gim i khi b tng nha chu ti trng trng phc. SVTH: Nguyn Vn Tu_Lp 02X3BTrang 195 n Tt Nghip Khoa Xy Dng Cu - ng+ Lc dnh phn t: To ra do s tc dng tng h gia nha v mt ngoi khong vt v do lc dnh kt bn trong ca bn thn nha. Thnh phn ny ph thuc nhiu vo cu trc, nht ca nha, nhit ca hn hp, t din b mt ca ct liu khong vt, s tng tc l hc, l ha hoc ha hc gia mng nha v mt ngoi khong vt, chiu dy mng nha bao bc cc ht khong v tc bin dng.d) u nhc im ca mt ng b tng nha:- Cng mt ng cao, chu ti trng thng ng v nm ngang u tt.- Mt ng c rng cn d nh, cht, kn nc hn ch c nc thm xung pha di.- Mt ng d to phng, cng ca mt ng khng ln nn cho php xe chy vivn tc cao m vn m thun, t gy ting n.- Mt ng c bo mn nh, t sinh bi.- C th c gii ha trong hu ht cc khu cng tc, cng tc duy tu bo dng, sa cha t, n gin.- Cng mt ng gim khi nhit cao.- H s bm gia bnh xe v mt ng gim khi mt ng m t.- Di tc dng ca nhit th d gy ra hin tng tri trt, bong bt, mt n nh v cng .- Loi mt ng ny c gi thnh tng i cao.- Yu cu phi c thit b trn, ri, lu ln chuyn dng.e) Cc lu trong qu trnh thi cng:- Chiu di on ri khng c qu ln nhm mc ch lu ln mt ng btng nha khi cn nhit cao.- BTN l loi hn hp c sc cn nht ln nn khi thi cng bt buc phi c phng tin lu bnh lp th mi m bo cht yu cu. B tng nha khi san ri lu ln yu cu nhit khng nh hn 1200C, gim tnh nht khi lu ln th nhit tt nht l t 1300-1400C. Khi nhit ca btng nha h xung di 700C th lu ln khng cn hiu qu na.- Khi nhit ca hn hp gim xung bng nhit ca khng kh th cng ca BTN coi nh hnh thnh, do BTN l loi vt liu khng ch thi gian vn chuyn, san ri v lu ln. V vy trong qu trnh thi cng lun thng xuyn kim tra nhit ca hn hp b tng nha.- m bo hn hp khng dnh vo bnh lu (bnh lp) trong qu trnh lu ln th nn dng du chng dnh bi vo bnh lu, khng nn dng nc chng dnh bm SVTH: Nguyn Vn Tu_Lp 02X3BTrang 196 n Tt Nghip Khoa Xy Dng Cu - ngvo bnh lu. Khi my lu khi ng, i hng tin ki th thao tc phi nh nhng. My lu khng c li trn lp btng nha cha lu ln cht v cha ngui hn.- Ch c thi cng mt ng b tng nha trong nhng ngy khng ma, mng ng kh ro, nhit khng kh khng kh khng di +50C. Trong nhng ngy u thi cng hoc khi dng mt loi b tng nha mi th phi tin hnh thi cng on th nghim trc khi cho thi cng i tr.- H s cht lu ln ca lp mt ng b tng nha ri nng sau khi thi cng xong khng nh hn 0,98. Lp mt trn: (lp BTN cht ht trung loi I Dmax20 dy 5cm)Lp b tng nha l mt lp kt cu cht, c to thnh sau khi trn u bt khong, ct liu c cp phi tt vi nha ng v c san ri lu ln t cht nht nh.C cng cao v n nh cng i vi ti trng v tc ng ca nc. C kh nng chu c tc dng ca hot ti thng ng cng nh p lc ngang ca bnh xe hot ti cng nh cc tc nhn mi trng thi tit.C cng ln nn hn ch c tc dng bo mn ca bnh xe hot ti. C kch c nh d to phng, hn ch c tc dng gy bong bt ca bnh xe v c nhm cao.C kt cu cht kn nn hn ch c tc ng ca nc mt Lp mt di: (lp BTN cht ht ln loi II Dmax25 dy 7cm)Lp ny cng lp mt trn v cc lp mng trn tham gia vo vic chu lc chnh ca kt cu o ng. Lp ny c mt s c im tng t nh lp mt trn tuy nhin v cc yu cu v bng phng, cht, mi mn... khng yu cu nghim ngoc nh lp mt trn.3.3.2 Lp mng: Cp phi dm.a) Chc nng:ng vai tr l lp mng trong kt cu o ng cp cao ch yu A1. V vy nn chu tc dng ca lc thng ng do hot ti gy ra l ch yu, thnh phn lc ngang lc ny hu nh tt sau khi truyn qua kt cu tng mt hoc c gi tr rt nh.V vy chc nng ch yu ca lp ny l tip nhn v truyn lc thng ng khi lc ny truyn n nn t th ng sut gim n mc nn ng c th chu c, khng pht sinh bin dng qu ln.b) Nguyn l s dng vt liu: Vt liu c s dng theo nguyn l cp phi, ct liu l hoc cui si nghin, trong c ht t 2mm tr xung c th l khong vt t nhin khng nghin nhng hm lng khng vt qu 50%.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 197 n Tt Nghip Khoa Xy Dng Cu - ngc) Nguyn l hnh thnh cng : Cng cp phi hnh thnh do thnh phn lc dnh v lc ma st trong.- Thnh phn lc dnh: y l thnh phn quan trng quyt nh cht lng ca cp phi, c to ra bi 2 yu t:+ Thnh phn lc dnh phn t: pht sinh do lc dnh ca cc ht c kch thc c ht keo, thnh phn lc dnh ny nng cao c cng cp phi khi chu c lc thng ng v nm ngang.+ Lc dnh tng h: do s mc vn vo nhau gia cc ht c kch thc ln, thnh phn ny nng cao c cng ca cp phi khi chu lc thng ng, c th c ci thin bng bin php m nn cht hoc s dng cp phi c kch c ln.- Thnh phn lc ma st: sinh ra do stip xc v ma st gia cc ht ct liu ln . cht ca cp phi cng ln th h s ma st cng tng.d) u nhc im:- Do s dng vt liu a phng nn gim cng vn chuyn, gim chi ph xy dng. - Cng ngh thi cng tng i n gin, d thc hin.- Kt cu mt ng cht, kn nc, c bit khi lu ln vi cht cao.- Tnh n nh nc ca mt ng cha cao, khi kh hanh mt ng sinh bi v khi m t mt ng gim cng .e) Cc lu trong qu trnh thi cng:- Do pha trn ca lp cp phi dm l lp BTN nn ta phi ti thm mt lp nha bitum lng hoc nha pha du 1kg/cm2hoc bng nha nh tng phn tch chm s lng 1,5-1,6kg/cm2(hm lng nha trong nh tng 50-60%).- Lp CPD dng trong kt cu o ng l lp CPD loi 1 nn yu cu ton b ct liu k c c ht mn u phi l sn phm nghin t sch, c mc bi bn khng ng k.- Trong qu trnh vn chuyn, san ri v lu ln cn lu tng xuyn kim tra m ca hn hp cng nh cc ch tiu khc v thnh phn ht. Nu pht hin thy hn hp b phn tng (tp trung c ht ln...) th phi xc b thay hn hp cp phi mi. Cm khng c b cc c ht v trn li ti ch.- Thi cng lp CPD hai bn phi c thnh chn, b va hoc l p trc. Nu khng phi thi cng ln hn chiu rng thi cng 1 on ti thiu l 20cm Lp mng trn: (lp Cp phi dm loi I Dmax25 dy 15cm)ng vai tr l lp mng trn trong kt cu o ng cp cao ch yu A1. V vy chu tc dng ca lc thng ng do hot ti gy ra l ch yu, thnh phn lc ngang.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 198 n Tt Nghip Khoa Xy Dng Cu - ngV vy chc nng ch yu ca lp ny l tip nhn v truyn lc thng ng khi lc ny truyn n nn t th ng sut gim n mc nn ng c th chu c, khng pht sinh bin dng qu ln. Lp mng di: (lp Cp phi dm loi I Dmax37,5 dy 18cm)ng vai tr l lp mng di trong kt cu o ng cp cao ch yu A1. V vy chu tc dng ca lc thng ng do hot ti gy ra l ch yu, thnh phn lc ngang lc ny hu nh tt sau khi truyn qua kt cu tng mt hoc c gi tr rt nh.3.4 Chn phng php t chc thi cng (TCTC):- V phng php t chc thi cng, trong thc t c 4 phng php, l: phng php TCTC tun t, phng php TCTC dy chuyn, phng php TCTC song song, phng php TCTC hn hp (kt hp cc phng php trc li vi nhau). - c dim t chc thi cng ca cng trnh mt ng:+ S dng nhiu vt liu: thng phi dng hng nghn m3 vt liu cho 1km ng, chi ph xy dng mt ng cao, chim khong 45% 65%tng gi thnh (vi ng vng ng bng v trung du), chi ph vt liu chim ti 60% 70%trong chi ph vn chuyn chim mt t l ln.+ Khi lng hu nh phn b u trn ton tuyn do tc thi cng mt ng thng khng thay i.+ K thut thi cng hu nh khng i cc on tuyn khc nhau. V vy cng ngh thi cng cc on khc nhau l ging nhau.+Dinthi cnghpvdi: mt ngch rng8,0mnhngchiudilnti 1000m. Do vic t chc cng tc vn chuyn tng i phc tp. + Cng tc thi cng phi tin hnh ngoi tri, ph thuc vo iu kin thi tit.+ a im thi cng thng xuyn thay i.=> thch ng vi cc c im trn, i vi cng trnh mt ng nn t chc thi cngtheo phngphpdy chuynbngcchbinchcctithicngchuyn nghip thi cng trn ton tuyn.Ngoi ra cc iu kin lin quan khc nh: Kh nng cung cp my mc khng hn ch, kh nng qun l v ch o ca cn b k thut thi cng tt, i ng cng nhn c tay ngh cao vi lc lng di do, p ng tt cho phng php t chc thi cng dy chuyn. i vi cng trnh mt ng th chn phng php TCTC dy chuyn s thch hp hn c.4. XC NH TC DY CHUYN V HNG THI CNG:SVTH: Nguyn Vn Tu_Lp 02X3BTrang 199 n Tt Nghip Khoa Xy Dng Cu - ng- Xc nh hng thi cng chung phi m bo iu kin vn chuyn cc nhu cu khc ca cng trng, nh vn chuyn trang thit b, my mc, m bo s lin h thun tin gia cng trng vi c quan ch o cp trn.- Tc thi cng dy chuyn c chn trn c s tc thi cng dy chuyn ti thiu.- Tc thi cng dy chuyn ti thiu ca mt ng l chiu di on ng ngn nht phi hon thnh sau 1 ca. Tc thi cng dy chuyn ti thiu c th c xc nh theo cng thc sau :) / (). (2 1minca mn t t TLV (III.1.1)Trong : L : Chiu di ton b on tuyn thi cng(m), L = 1000mn : S ca trong 1 ngy, n = 1 ca.T : Thi gian tnh theo lch k t ngy khi cng n ngy phi hon thnh cng trnh theo nhim v (ngy) , T = 25 ngy.t1 : Thi gian khai trin dy chuyn l s ngy k t ngy khi cng ca t u tin n ngy khi cng ca t chuyn nghip sau cng. Thng thng t1=(3 5) ca, thi gian chun b 2 3 ngy => chn t1= 5ca.t2 : Thi gian ngh vic (ngy) do thi tit, do ngh l, Tt, ch nht .;'22212maxtttGi:t21 l s ngy ngh do thi tit xu.t22 : S ngy ngh vic do ngh l, Tt, ch nht .V ngy thi tit xu (ma) khng thi cng c c th trng vi cc ngy ngh. Do , tuy nhin phi cn c tnh hnh c th m iu chnh cho hp l.Vit21: c xc nh theo s liu d bo thi tit ca trm kh tng thu vn a phng. Gi thit t21 = 2ngy.t22: xc nh c th theo lch trong khong thi gian yu cu thi cng, t22 = 2 ngy (Khi t chc thi cng Ban qun l c th thc hin hp ng lao ng vi ngi lao ng trong thi gian thi cng kp tin ra lm c nhng ngy ch nht) => t2 = 6ngy) / ( 9 , 1421 ). 6 12 25 (1000minca m V - Tc thi cng thc t (Vt) yu vu phi ln hn hoc t nht l bng tc thi cng ti thiu (Vmin) Vt Vmin = 160 m/ca.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 200 n Tt Nghip Khoa Xy Dng Cu - ng- xc nh tc thi cng cn cn c vo kh nng k thut, kh nng cung cp trang thit b, my mc v nguyn vt liu m quyt nh. Tuy nhin, phi trn c s pht huy ti a cng sc ca my mc, thit b thi cng. Nht l i vi my chnh, nng sut lao ng, my mc v h c gi thnh xy dng. - Tc thi cng cng ln, nhu cu nhn vt lc trong mt ca thi cng cng nhiu. V th nn cn xc nh thm tc thi cng ca my ch o (Vt) , t cn c chn tc dy chuyn cho hp l. Trong cc giai on thi cng mt ng th my lu lun gi vai tr l my ch o, do :., /tk NV m caB(III.1.2)Trong : N : Nng sut ca 1 my lu (m2/ca)k: S my cng lm vic trn mt onB: B rng mt ng (m)- V ta cha thit k c th cng vic v tnh ton c th khi lng nn ch s ny ta c th kim tra lai sau khi thit k c th sau ny.-ng thinn chn tc dy chuyn khng l i vi chiu di ton tuyn ng, tc 1Km. Theo kinh nghim, thng thng tc dy chuyn khong 100 200m/ca , i khi 200-300m/ca=> Chn tc thi cng dy chuyn Vt=160m/ca.5. THIT K T CHC THI CNG KHUN NG:5.1 Cng tc khi phc h thng cc: xy dng kt cu mt ng ng v tr, kch thc, cao . Trc khi xy dng cc lp mt ng bao gi cng phi khi phc cc, t xc nh li h thng cc hai bn mp l xe chy v phn l gia c, b sung cc cc b mt, sa li cc cc b xin lch. Sau kim tra li cao nn ng ti cc cc chi tit c nhng iu chnh cn thit trc khi thi cng kt cu mt ng. thc hin cc cng tc ny ta b tr 1 k s, 1 trung cp v 2 cng nhn cng vi cc trang thit b cn thit. T ny thc hin cng tc kim tra cao trong sut qu trnh thi cng.5.2 Phn on thi cng khun ng:Do k thut thi cng cng tc chun b khc nhau i vi tng loi nn ng nn ta chia on tuyn thit k k thut thnh cc on ch c dng nn ng l dng nn o hon ton v dng nn p hon ton. Vi dng nn o hon ton th ta thi cng SVTH: Nguyn Vn Tu_Lp 02X3BTrang 201 n Tt Nghip Khoa Xy Dng Cu - ngkhunngtheophngphpokhun,vidng phontonth tathicng khun ng theo phng php p p l hon ton. Bng III.1.2: Phn on thi cng khun ng.on thi cngL trnh u onL trnh cui onChiu di on (m) Bin php thi cngI KM1+00 KM1+610 610 p l ngII Km1+610 KM2+00 390 o lng ngHnh III.1.2- Mt ct ngang khun ng dng p l hon ton.Hnh III.1.3- Mt ct ngang khun ng dng o lng hon ton.5.3 Xc nh trnh t thi cng:Bng III.1.3: Bng trnh t thi cng khun ng.STT NI DUNG CNG VICI p l hon ton on KM1+00 KM1+6101 nh v tim ng, mp phn xe chy, mp l gia c.2 Vn chuyn thnh chn, cc st.3 Dng thnh chn ln 1.4 Ti nc to dnh bm vi nn t.5 Vn chuyn t t on II n p l ln 1.6 San ri t p l ng ln 1 dy 18cm.7 m cht l ng + b ph.8 Tho thnh chn ln 1.9 Dng thnh chn ln 2.10 Ti nc to dnh bm vi lp di.11 Vn chuyn t t on II n p l ln 2.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 202501:1,56%2%aplelan1day18cm, rongtrungbnh109,5cmaplelan2day15cm, rongtrungbnh82,5cmaplelan3day12cm, rongtrungbnh60,0cm4002%400 501:1 1:140 40aolongngday47cm, rong800cm6% n Tt Nghip Khoa Xy Dng Cu - ng12 San ri t p l ng ln 2 dy 15cm.13 m cht l ng + b ph.14 Tho thnh chn ln 2.15 Dng thnh chn ln 3.16 Ti nc to dnh bm vi lp di.17 Vn chuyn t t on II n p l ln 3.18 San ri t p l ng ln 3 dy 12cm.19 m cht l ng + b ph.20 Tho thnh chn ln 3.21 o rnh ngang thot nc tm.22 San sa lng ng.23 Lu tng cng phn lng ng.24 m mp phn lng ng bng m tay .25 Cng tc kim tra, nghim thu khun ng.II o lng hon ton on KM1+610 KM2+001 San sa phn l ng to dc mui luyn.2 m tng cng l ng.3 o t lng ng dy 35cm, rng 7,8m.4 Vn chuyn t o n p l on I.5 Vn chuyn t tha i.6 o rnh ngang thot nc.7 San sa phn lng ng to dc mui luyn.8 Lu tng cng phn lng ng.9 m mp phn lng ng bng m tay .10 Cng tc kim tra, nghim thu khun ng .5.4 Xc nh nh k thut thi cng:5.4.1 Thi cng on p l hon ton:1) nh v tim ng, mp phn xe chy, mp l gia c.- Nh ni mc 5.1, vic xy dng h thng cc rt quan trng. H thng cc c nh 2 bn mp phn xe chy v l gia c nh phm vi thi cng. SVTH: Nguyn Vn Tu_Lp 02X3BTrang 203 n Tt Nghip Khoa Xy Dng Cu - ng- Tip theo tin hnh kim tra cao nn ng cc cc chi tit kp thi c nhng iu chnh cn thit trc khi thi cng kt cu mt ng.- nh phm vi thi cng v tin hnh di cc ra khi phm vi thi cng : lng ng (Bm = 2 4,0 = 8,0 m), l t (Bl = 2 0,5 = 1,0m). Trong phn l gia c c chiu rng mi bn l 0,5m c thi cng chung vi phn xe chy (v c kt cu ging kt cu o ng phn xe chy). Khi di cc ra ngoi phm vi thi cng phi c nh du vo s cc thi cng cng vi khong cch c th sau ny d r sot kim tra khi cn.- Dng c thi cng bao gm : My kinh v, my thu bnh, mia, thc thp.=> thc hin cng tc ny b tr 1KS + 1TC + 2CN cng vi cc thit b cn thit. T ny thc hin cng tc kim tra cao trong sut qu trnh thi cng2) Vn chuyn thnh chn, cc st.- Dng t Huyndai 15T chuyn ch v dng nhn lc bc d. Thnh chn bng g c kch thc l 25 2cm vdi 5m. Thnh chn c gi bng cc st bng thp AI, 20 c chiu di tng cng 0,6m t cch nhau 1,5m.- Cc st c cu to thm mt g gi thnh chn trn mt t cho cc ln p l sau tn dng li thnh chn ny.Hnh III.1.4- Cu to cc st.3) Dng thnh chn ln 1.- Cng vic ny c dng nhn lc thi cng. Dng thnh chn dc theo hai mp phn xe chy.4) Ti nc to dnh bm vi nn t.- Dng xe ti nc Xitec DM10 ti nc to dnh bm vi t nn ng, tiu chun 2l/m2.5) Vn chuyn t t on II n p l ln 1.- t p l c ly phn o khun ca nn o (on II) c vn chuyn bng t Hyundai 15T n nn p p l. t vn chuyn n c thnh hai lung hai bn l , mi xe thnh 6 ng, khong cch tim gia cc ng t nh sau :L = B hQ.6 /(III.1.3)Chiu dy san ri : h = htk.kr = 18.1,4 = 25,2cm.Khi lng t t vn chuyn trong mt chuyn : Q = 10m3.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 2042560cm22 n Tt Nghip Khoa Xy Dng Cu - ngB rng t p trung bnh B = 1,095m. => L =m 6095 , 1 . 252 , 06 / 10.Hnh III.1.5- S t p l ng ln 1.6) San ri t p l ng ln 1.- Dng my san D465 san ri t, lp t san ri c chiu dy h = 25cm. B rng san ri trung bnh l 1,095m (cho 1 bn l).- San 3 4lt/im, vi s lm vic v cc thng s li san nh sau:Hnh III.1.6- S san ri t l ng ln 1.7) m cht l ng + b ph.- Sau khi p l ng b rng, cao thit k ta tin hnh m l v b ph t vo nhng ch thiu. Dng m tay BPR45/55D m nn t p l t K0,95.Hnh III.1.7- My m BPR45/55D. Hnh III.1.8- Cc thng s ca BPR45/55D.Bng III.1.4: Cc thng s ca my m BPR45/55D:H(mm) H1(mm) L(mm) L1(mm) W(mm) W1(mm)790 1010 1700 900 450 550Nng sut m mp 360(m/h)Nng sut m cht t l ng 33 44(yd3/h) / 25,2 33,6(m3/h)8) Tho thnh chn ln 1.- Cng vic ny ta dng nhn cng thc thin, thnh chn c ly ln gom li dng cho cc ln sau. 9) Dng thnh chn ln 2.- Cng tc ny c thc hin sau khi thi cng xong lp mng di CPD dy 18cm.- Tn dng thnh chn va ly ln ta dng thnh chn thi cng phn p l rng trung bnh 82,5cm.10)Ti nc to dnh bm vi lp di.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 205Gc y 750Gc nghing 3026 (6%)Gc xn 1506m 6m 6m 6m 6m1:1,52%1,1m3,04 n Tt Nghip Khoa Xy Dng Cu - ng- Dng xe ti nc Xitec DM10 ti nc to dnh bm vi t nn ng, tiu chun 2l/m2.11)Vn chuyn t t on II n p l ln 2.- t p l cng c ly phn o khun ca nn o (on II) c vn chuyn bng t Hyundai 15T n nn p p l. t vn chuyn n c thnh hai lung hai bn l , mi xe thnh 6 ng, khong cch tim gia cc ng t nh sau :L = B hQ.6 /(III.1.3)Chiu dy san ri : h = htk.kr = 15.1,4 = 21cm.Khi lng t t vn chuyn trong mt chuyn : Q = 10m3.B rng t p trung bnh B = 0,825m. => L =m 6 , 9825 , 0 . 21 , 06 / 10.Hnh III.1.9- S t p l ng ln 2.12)San ri t p l ng ln 2.- Dng my san D465 san ri t, lp t san ri c chiu dy h = 21cm. B rng san ri trung bnh l 0,825m (cho 1 bn l).- San 3 4lt/im, vi s lm vic v cc thng s li san nh sau:Hnh III.1.10- S san ri t l ng ln 2.13)m cht l ng + b ph.- Sau khi p l ng b rng, cao thit k ta tin hnh m l v b ph t vo nhng ch thiu. Dng m tay BPR45/55D m nn t p l t K0,95.14)Tho thnh chn ln 2.- Cng vic ny ta dng nhn cng thc thin, thnh chn c ly ln gom li dng cho cc ln sau. 15)Dng thnh chn ln 3.- Cng tc ny c thc hin sau khi thi cng xong lp mng trn CPD dy 15cm.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 206Gc y 750Gc nghing 3026 (6%)Gc xn 1509,6m 9,6m 9,6m 9,6m 9,6m3,040,83m2%1:1,5 n Tt Nghip Khoa Xy Dng Cu - ng- Tn dng thnh chn va ly ln ta dng thnh chn thi cng phn p l rng trung bnh 60cm.16)Ti nc to dnh bm vi lp di.- Do din thi cng hp nn ta cng nhn kt hp vi xe ti nc Xitec DM10 ti nc to dnh bm vi t nn ng, tiu chun 2l/m2.17)Vn chuyn t t on II n p l ln 3.- t p l cng c ly phn o khun ca nn o (on II) c vn chuyn bng t Hyundai 15T n nn p p l. t vn chuyn n c thnh hai lung hai bn l , mi xe thnh 6 ng, khong cch tim gia cc ng t nh sau :L = B hQ.6 /(III.1.3)Chiu dy san ri : h = htk.kr = 12.1,4 = 16,8cm.Khi lng t t vn chuyn trong mt chuyn : Q = 10m3.B rng t p trung bnh B = 0,825m. => L =m 5 , 1660 , 0 . 168 , 06 / 10.Hnh III.1.11- S t p l ng ln 3.18)San ri t p l ng ln 3.- Do din thi cng hp nn ta dng nhn cng san ri t p l, b dy san ri h = 17cm, b rng san ri trung bnh 0,60m (cho 1 bn l).19)m cht l ng + b ph.- Sau khi p l ng b rng, cao thit k ta tin hnh m l v b ph t vo nhng ch thiu. Dng m tay BPR45/55D m nn t p l t K0,95.20)Tho thnh chn ln 3.- Cng vic ny ta dng nhn cng thc thin, thnh chn c ly ln gom li dng cho cc ln sau. 21)o rnh ngang thot nc tm.- o h thng thot nc tm trong thi gian thi cng. H thng thot nc tm thi l cc rnh ngang, c b rng bng 0,30m c b tr so le nhau trn mt bng vi khong cch l 20m. i vi nn ng p th nc theo rnh ngangrakhi l theomi taluy SVTH: Nguyn Vn Tu_Lp 02X3BTrang 20716,5m 16,5m 16,5m 16,5m 16,5m400 501:1,56%2%6%1:1,550 4002%20m0,3m1,25m30 n Tt Nghip Khoa Xy Dng Cu - ngthot ra khi nn ng. Cng tc ny ta dng nhn cng thi cng. S b tr h thng thot nc tm trong thi gian thi cng nh hnh sau : Hnh III.1.12- S b tr v cu to rnh thot nc ngang nn p.22)San sa lng ng.- Cng vic ny c tin hnh kt hp vi vic san sa bng phng v mui luyn lng ng.- Chnh vic san sa mui luyn cho lng ng, to bng phng cn thit phc v cho cng tc lu ln tng cng nn ng sau ny c th to dc mui luyn c d dng, v thot nc tt trong qu trnh thi cng.- Cng tc ny c th dng 1 my san D465, san 2-3 lt/im, c li san t nghing ra l v c dc ng bng dc ngang ng cn thit.- My san D465 t cc gc li san khi san sa mui luyn nh sau: gc y: 750; gc ct: 900; gc nghing: 108(2%). - S hot ng ca my san nh sau:Hnh III.1.13- S hot ng ca my san khi san sa nn ng.23)Lu tng cng nn ng.- Kt hp ngay sau khi chnh sa xong mui luyn nn ng, tin hnh cho ngay lu nng bnh cng vo lu tng cng cho nn ng.- Dng lu nng bnh cng D400A lu khong 12-18lt/im, v =3Km/h.+ S lt trn im: n = 4 lt/im.+ S hnh trnh: Nth = 12 hnh trnh.+ S lt yu cu: nyc = 12 lt/im.+ S chu k: n = 3 chu k.+ Tng s hnh trnh: N = 36 hnh trnh.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 208304304304 20 7620 76400 506%2% 2%6%50 400304123480020202020800464 46130202013012435691087111240204020 n Tt Nghip Khoa Xy Dng Cu - ngHnh III.1.14- S lu tng cng nn ng p l.24)m mp phn lng ng:- Dng m tay BPR45/55D m nn t hai bn mp lng ng nhng ch m my lu khng i ti t chtK0,98.25)Cng tc kim tra, nghim thu khun ng.Trong qu trnh thi cng lng ng phi thng xuyn kim tra cao v dc dc ca lng ng bng my kinh v, ng thi phi kim tra hnh dng lng ng cng nh kim tra kch thc v bng phng ca lng ng .Sau khi thi cng xong khun ng cn kim tra v nghim thu cc hng mc sau y - Kch thc hnh hc :+ B rng nn ng sai s cho php:t 10 (cm).+ Tim ng cho php lch so vi thit k:t 10 (cm).+ dc ngang v dc dc lng ng, sai s cho php:t 0,5%- cht v bng phng :+ Kim tra 3 v tr trong 1 km, mi v tr t thc di 3m dc tim ng v hai bn cch mp mt ng 1m . + Kim tra cht ca t nn ng bng phng php rt ct. Nn ng phi t cht Kyc0.98. Mu phi ly su cch y KCA 15cm.5.4.2 Thi cng on o lng hon ton:1) San sa phn l ng to dc mui luyn.- Dng my san D465 san to mui luyn phn l ng rng 0,5m.- San 3 4lt/im, vi s lm vic v cc thng s li san nh sau:Hnh III.1.15- S san sa l ng nn o.2) m tng cng l ng.- Sau khi san sa to mui luyn xong cho l ng ta tin hnh m l v b ph t vo nhng ch thiu. Dng m tay BPR45/55D m nn t p l t K0,95.3) o t lng ng rng 8m.- m bo cao nn ng sau khi lu ln xong y o ng th khi thi cng o khun ng cn phi tnh ton chiu cao phng ln theo cng thc tnh gn SVTH: Nguyn Vn Tu_Lp 02X3BTrang 209Gc y 750Gc nghing 3026 (6%)Gc xn 1503,040,5m2%1:1,56% n Tt Nghip Khoa Xy Dng Cu - ngng nh sau:) () (cm HKK Khdndndn yc (III.1.4) Trong : Kyc : cht yu cu, Kyc=0,98Kn : cht nn t nhin, Kn=0,8.Hn : Chiu dy m nn yu cu, H = 20cm.=> cm cm h 5 ) ( 5 , 4 20 .8 , 0) 8 , 0 98 , 0 ( Nh vy : Khi k n chiu cao phng ln th chiu dy lp t o phn lng ng s: Chiu rng o B = 8m, chiu dy o h = 45-5 = 40cm.- thi cng khun ng o vi chiu su o 40cm c th dng my o loi gu nghch kt hp vi t t ; dng my san, hay my i kt hp vi xc lt v t vn chuyn t. Nu dng my i th sau khi thi cng khun ng xong s khng tn dng thi cng cc cng vic khc c do h s s dng my s khng cao, mt khc thi cng bng my i phi dn thnh tng ng, sau phi dng my xc xc t ln t v vn chuyn i, vi phng php thi cng bng my san cng tng t nh my i. Hnh III.1.16- Hnh nh my iD41P-6C.Trong khi nu dng my o kt hp vi t qu trnh thi cng s n gin hn nhiu, lc ny my o tin hnh o t vthnglntvni, tuy nhin vi khi lng t o khun khng ln, chiu su o nh nn vic dng my o cng khng tn dng ht c nng sut ca cm my hn na vic o khun ng vi chiu su o ch c 35 40cm th s rt kh khn, d lm thiu cao y o ng. Do dng my i kt hp vi my xc lt t ln t vn chuyn thi cng lng ng l tng i hp l hn c trong trng hp ny.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 210Thng s my i D41P-6CCng sut P (HP) 110Chiu di ben B (m) 3,35Chiu cao ben H (m) 1,06Khi lng t trc ben (m3) 2,9Vn tc V (km/h) 1,9 9,4Trng lng G (T) 11,52Thng s my xc lt WA95-3Cng sut P (HP) 74Dung tch thng Qt (m3) 1,1Chiu rng thng B (m) 2,15Chiu cao nng H (m) 3,45Vn tc V (km/h) 20Trng lng G (T) 5,83 n Tt Nghip Khoa Xy Dng Cu - ngHnh III.1.17- Hnh nh my xc lt WA950-3.- Chiu dy lp t my o cn o l 40cm ( k chiu cao phng ln 5cm). Khi o m bo khng phm vo lpy o ng th nn o cch cao y o ng khong 5 10cm, ng thi cng nn cch mp l khong 5 10cm. Phn t cn li sau khi thi cng bng my i ny s c my san gt sa ng hnh dng v cao thit k. Nh vy chiu rng cn xn t bng my i l B = 7,8m; chiu su cn xn l h = 35cm.- Myi D41P-6Cxnt theokiulpmng, chiudymi lnxnt 8 10cm, chiu di on xn t t l = 5 7m. Sau khi xn t xong my i vn chuyn t dn ng lng ng, khong cch gia cc ng t dn ngl ld= 50 m.Hnh III.1.18- S xn t theo kiu lp mng.- Khi lng t trc li i khi xn v vn chuyn t trng thi cht vo cui giai on xn : tg KK H lQrtt. . 2. .2 (III.1.5)Trong :+ l : Chiu di li i, L = 3,35 (m). + H : Chiucao li i, H = 1,06 (m). + : Gc ma st trong ca t, = 240.+rK : H s ri rc ca t,rK = 1,2 (t st ln si sn).+ Ktt : H s tn tht ca t khi vn chuyn. Ktt=1-(0,005+0,004LVC) = 0,80.+ Lvc : C ly vn chuyn, Lvc = 50(m).+ B : B rng mt ng cn o bng my i, B =7,8m.Thay cc gi tr vo cng thc (III.1.5) ta c : ) ( 82 , 224 . 2 , 1 . 280 , 0 . 06 , 1 . 35 , 3302mtgQ Chiu di xn t l :h lQLx. (III.1.6)S ln xn trn chiu rng mt ng :lanlBn 335 , 38 , 71]1

1]1

(III.1.7)S ln xc ca my xc lt ln 1 t: n = (1,05.10/3,1) = 4lnSVTH: Nguyn Vn Tu_Lp 02X3BTrang 211l =6-8m(V=2,0m3)h = 8-10cm n Tt Nghip Khoa Xy Dng Cu - ngTrong :1,05 : l h s ri vi.10 : l th tch mt xe Huyndai 15T.3,1 : l th tch gu xc ca my xc lt.Ln xn th 1, 2:Hnh III.1.19- S xn t theo kiu lp mng ln th 1, 2.=> Chiu di xn t l :mh lQLx0 , 712 , 0 . 35 , 382 , 2. Ln xn th 3:Hnh III.1.20- S xn ttheo kiu lp mng ln th 2.=> Chiu di xn t l :mh lQLx7 , 711 , 0 . 35 , 382 , 2. 4) Vn chuyn t o n p l on I.t c o v dn ng ti gia lng ng ri c xc trt tip ln xe t Huyndai 15T bng my xc lt WA250-5 ri ch t n tp kt hai bn l ng ca nn p (on I) san ri p l, nu d c vn chuyn i cch cng trnh 1km.5) Vn chuyn t tha i.t tha sau khi vn chuyn n p l on I th c t ch n thi cch im u on II khong 1Km.6) o rnh ngang thot nc.- o h thng thot nc tm trong thi gian thi cng. H thng thot nc tm thi l cc rnh ngang, c b rng bng 0,30m c b tr so le nhau trn mt bng vi khong cch l 20m. i vi nn ng o th nc theo rnh ngang ra khi l chy xung cc rnh dc hai bn l ng. Cng tc ny ta dng nhn cng thi cng.- V cao y o ng thp hn cao rnh bin nn bin php thot nc l ngoi lm rnh ngang phi lm thm h t nc. u im ca bin php ny l m bo thot nc trong qu trnh thi cng, sau khi thi cng xong lp mng c th lp li d dng ng thi vn m bo cho nc trong rnh bin c lu thng thun li.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 212Lx=7,0mh1,2x=12cmLx =7,7mh3x =11cm n Tt Nghip Khoa Xy Dng Cu - ng+ Cu to b phn h t: H t c chiu su 0,5m; tit din h 0,5 1,0(m2), khong cch gia cc h t trng vi khong cch gia cc rnh ngang.Bin php x l khi tri ma: Nc t y lng ng theo cc rnh ngang thot ra cc h t, khi dng nhn cng tt nc hay dng my bm ht nc n cao rnh bin lm kh lng ng.Sbtr hthngthot nctmtrongthi gianthi cng nh sau:nh III.1.21- S b tr v cu to h thng thot nc ngang nn o.7) San sa phn lng ng to dc mui luyn.- Chnh vic san sa mui luyn cho lng ng, to bng phng cn thit phc v cho cng tc lu ln tng cng nn ng sau ny c th to dc mui luyn c d dng, v thot nc tt trong qu trnh thi cng.- Cng tc ny c th dng 1 my san D465, san 4 6 lt/im, c li san t nghing ra l v c dc ng bng dc ngang ng cn thit.- My san D465 t cc gc li san khi san sa mui luyn nh sau: gc y: 750; gc ct: 900; gc nghing: 108(2%). - S hot ng ca my san nh sau:Hnh III.1.22- S hot ng ca my san khi san sa nn ng.8) Lu tng cng phn lng ng.- Kt hp ngay sau khi chnh sa xong mui luyn nn ng, tin hnh cho ngay lu nng bnh cng vo lu tng cng cho nn ng.- Dng lu nng bnh cng D400A lu khong 12-18lt/im, v =3Km/h+ S lt trn im: n = 4 lt/im.+ S hnh trnh: Nth = 12 hnh trnh.+ S lt yu cu: nyc = 12 lt/im.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 213304304304 20 7620 76400 506%2% 2%6%50 40030412348003020m2%400 506%2%6%1:150 4001:1 1:11,00,50,50,5 n Tt Nghip Khoa Xy Dng Cu - ng+ S chu k: n = 3 chu k.+ Tng s hnh trnh:N = 36 hnh trnh.Hnh III.1.23- S lu tng cng nn ng o lng.9) m mp phn lng ng bng m tay .- Dng mtay BPR45/55D m nn t hai bn mp lng ng nhng ch mmylukhngi ti t chtK0,98.10)Cng tc kim tra, nghim thu khun ng .- Tng t mc (25) phn 5.4.1.5.5 Xc lp cng ngh thi cng:Bng III.1.5: Bng xc lp cng ngh thi cng khun ng.STT NI DUNG CNG VIC My mc v nhn lcIp l hon ton on KM1+00 KM1+610My NC1 nh v tim ng, mp phn xe chy, mp l gia c.2 Vn chuyn thnh chn, cc st.Huyndai 15T3 Dng thnh chn ln 1.NC4 Ti nc to dnh bm vi nn t.Xitec DM105 Vn chuyn t t on II n p l ln 1.Huyndai 15T6 San ri t p l ng ln 1 dy 18cm.San D4657 m cht l ng + b ph.m BPR45/55D NC8 Tho thnh chn ln 1.NC9 Dng thnh chn ln 2.NC10 Ti nc to dnh bm vi lp di 2l/m2.Xitec DM1011 Vn chuyn t t on II n p l ln 2.Huyndai 15T12 San ri t p l ng ln 2 dy 15cm.San D46513 m cht l ng + b ph.m BPR45/55D NC14 Tho thnh chn ln 2.NC15 Dng thnh chn ln 3.NC16 Ti nc to dnh bm vi lp di 2l/m2..Xitec DM1017 Vn chuyn t t on II n p l ln 3.Huyndai 15TSVTH: Nguyn Vn Tu_Lp 02X3BTrang 21420202020800464 46130202013012435691087111240204020 n Tt Nghip Khoa Xy Dng Cu - ng18 San ri t p l ng ln 3 dy 12cm.NC19 m cht l ng + b ph.m BPR45/55D NC20 Tho thnh chn ln 3.NC21 o rnh ngang thot nc tm.NC22 San sa lng ng san 4 6lt/im.San D46523 Lu tng cng lng ng 12l/, V=3km/h.Lu D400A24 m mp phn lng ng bng m tay .m BPR45/55D NC25 Cng tc kim tra, nghim thu khun ng.NCIIo lng hon ton on KM1+610 KM2+00My NC1 San sa phn l ng to dc mui luyn, 4 6l/.San D4652 m tng cng l ng.m BPR45/55D NC3 o t lng ng dy 35cm, rng 7,8m.i D41P-6C4 Vn chuyn t o n p l on I.Huyndai 15T5 Vn chuyn t tha i.Huyndai 15T6 o rnh ngang thot nc.NC7 San sa lng ng to dc mui luyn, 4 6l/.San D4658 Lu tng cng phn lng ng, 12l/, V=3km/h.D400A9 m mp phn lng ng bng m tay .m BPR45/55D NC10 Cng tc kim tra, nghim thu khun ng .NC5.6 Xc nh khi lng cng tc:5.6.1. Khi lng vt liu:1) Khi lng thnh chn, cc st:- S lng thnh chn: 2.(610/5) = 244ci- Khi lng thnh chn: 0,25.0,02.5.244 = 6,1m3.- S lng cc st:2.[(610/1,5) + 1] = 816cc.- Khi lng cc st: (.0,022.0,6/4).816 = 0,15m3.=> Tng khi lng thnh chn, cc st: 6,25m3.2) Khi lng t p l: (tnh theo khi lng cht)- p l ln 1: 2.1,10.610.0,25 = 335,5m3.- p l ln 2: 2.0,83.610.0,21 = 212,65 m3.- p l ln 3: 2.0,60.610.0,17 = 124,44 m3.- Tng khi lng t p l: 672,59 m3.3) Khi lng t o khun: (tnh theo khi lng cht)- Khi lng o bng my i: 0,35.7,80.390 = 1.064,70 m3.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 215 n Tt Nghip Khoa Xy Dng Cu - ng- Khi lng san sa bng my san: 2.0,05.0,10.390 = 3,9 m3.- Khi lng t o i: 1064,70 672,59 = 392,11 m3.4) Khi lng nc ti to dnh bm:- Ti nc ln 1: 2.2.1,24.610 = 3.025,6lt = 3,03m3.- Ti nc ln 2: 2.2.0,95.610 = 2.318,0 lt = 2,32m3.- Ti nc ln 3: 2.2.0,70.610 = 1.708,0 lt = 1,71m3.5) Khi lng t o rnh ngang, h t:- i vi on nn p: 2.[1,24.0,3.0,47.( 20610 + 1)] = 11,02 m3.- i vi on nn o: 2.0,63.1,0.0,5+0,82.0,3.0,47.(20390+1)=17,66 m3.5.6.2. Khi lng tng cng tc c th:Khi lng cng tc c th tng thao tc c th hin ph lc 25.5.7 Tnh ton nng sut-xc nh cc nh mc s dng nhn lc:5.7.1 Tnh ton nng sut my mc:1) My lu D400A:- Nng sut ca my lu c tnh theo cng thc:( ) . .01 , 0. . . 60N tVL LH B L K TNqt++ (m3/ca) (III.1.8)( ) . .01 , 0. . . 60N tVL LB L K TNqt++ (m2/ca) (III.1.9)( ) . .01 , 0. 60N tVL LL K TNqt++ (m/ca) (III.1.10)- Trong :V: tc lu (m/pht).Kt = 0,7 0,9 : h s s dng thi gian, Kt = 0,9.T : thi gian lm vic 1 ca, T = 7h.B : chiu rng ca on m nn (m). Tu theo cc giai on lu ln c cc gi tr khc nhau.L : chiu di thao tc (m).H : chiu dy lp t m nn (m).tq : thi gian quay u, i s, tq = 0,5 pht. = 1,2 1,3 : h s k n s khng chnh xc khi lu, = 1,2.N: Tng s hnh trnh khi lu, N = nck.Nht (hnh trnh)SVTH: Nguyn Vn Tu_Lp 02X3BTrang 216 n Tt Nghip Khoa Xy Dng Cu - ngnck: S chu k phi thc hin m bo s ln m nn yu cu.n: s ln m nn sau mt chu k (theo s lu) (lt/im)nyc : s lt m nn yu cu (ty theo cc giai on lu khc nhau s c cc gi tr khc nhau) (lt/im)Nht: s hnh trnh lu phi thc hin trong 1 chu k (hnh trnh/chu k) xc nh theo s lu c th.nnnycck (III.1.11)Bng III.1.6: Bng tnh nng sut my lu.STTHng mc cng tcLoi luL (m)V (Km/h)nycn nckNhtNP (m/ca)1Lu tng cng lng ngD400A 200 3 14 4 3 12 36 385,462) m tay BPR45/55D:Bng III.1.7: Bng nng sut my m tay BPR455/55D.Hng mc cng tc P (m/ca)Nng sut m mp 360 (m/h) = 2520 (m/ca)Nng sut m cht t l ng 200 (m2/h) = 1400 (m2/ca)3) My i D41P-6C:- Nng sut ca my i c tnh theo cng thc:ckt dTK K Q TN. . . . 60 (m3/ca) (III.1.12)- Trong :Q: Khi lng t trc li i, Q = 2,82m3.(mc 4 phn 5.4.2)Kd: H s nh hng dc dc, Kd = 1,05.Kt: H s s dng thi gian, Kt = 0,85.T: Thi gian lm vic trong 1 ca, T = 7h.Tck: Thi gian lm vic trong 1 chu k.d h qccxxckt t tVLVLVLT + + + + + 2 211(III.1.13)Lx : Chiu di xn t bnh qun. Lx = 7,35m.( n gin ta tnh chung cho 2 ln xn t th nht v th hai)Lc: Chiu di vn chuyn t trung bnh, Lc=Lvc-Lx= 507,35 = 42,65m.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 217 n Tt Nghip Khoa Xy Dng Cu - ngLl : Chiu di li li, Ll = Lx + Lc = 50m.Vx : Tc xn t, Vx = 2km/h = 33,33m/ph.Vc : Vn tc vn chuyn t, Vc= 3km/h = 50 m/ph.Vl : Tc li li, Vl = 4km/h = 66,67 m/ph.tq : Thi gian quay u chuyn hng, tq = 30s = 0,5pht.t : Thi gian i s, t = 6s = 0,1 pht.th : Thi gian nng h li i, th= 15s = 0,25 pht.42 , 3 1 , 0 25 , 0 . 2 5 , 0 . 267 , 660 , 500 , 5065 , 4233 , 3335 , 7 + + + + + ckT (pht).=> Nng sut ca my i :07 , 30942 , 385 , 0 . 05 , 1 . 82 , 2 . 7 . 60 N (m3/ca)4) My xc lt WA95-3:- Nng sut ca my xc lt c tnh theo cng thc: r ckt dK TK K T QN.. . . . 3600 (III.1.14)- Trong :Q : Dung tch ca gu xc t Q = 1,1m3.Kd: H s y gu, gi thit, Kd = 0,95.Kt: H s s dng thi gian, Kt = 0,85.T: Thi gian lm vic trong mt ca, T = 7h.Tck: Thi gian lm vic trong mt chu k, Tck = 20s.Kr: H s ti ca t, Kr = 1,2=> Nng sut ca my xc lt:67 , 9322 , 1 . 2085 , 0 . 95 , 0 . 7 . 1 , 1 . 3600 N(m3/ca)5) My san D465:- Khi san ri vt liu l ng:N tVLVLH b l L K TNst

,_

+ +. 2). sin .( . . . 602 1 (m3/ca) (III.1.14)- Trong :H: chiu dy thi cng.L = 100m : chiu di on thi cng.V1, V2: tc ca my khi lm vic v khi chy khng.V1 = 3,5Km/h = 58,33 m/pht.V2 = 4Km/h = 66,67 m/pht.tss: Thi gian sang s, tss = 30s = 0,5 pht.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 218 n Tt Nghip Khoa Xy Dng Cu - ngN = 6 : s hnh trnh ca my san.l: Chiu di li san l = 3,05m.b: Chiu rng bnh qun di sau chng ln di trc.: gc y, = 750. + San ri t l ng ln 1:Vi H = 25cm; N = 2.6 = 12(lt/im)68 , 68112 5 , 0 . 267 , 6610033 , 5810025 , 0 ). 0 75 sin 05 , 3 .( 100 . 85 , 0 . 7 . 60

,_

+ + N (m3/ca)+ San ri t l ng ln 2:Vi H = 21cm; N = 2.6 = 12(lt/im)61 , 57212 5 , 0 . 267 , 6610033 , 5810021 , 0 ). 0 75 sin 05 , 3 .( 100 . 85 , 0 . 7 . 60

,_

+ + N (m3/ca)- Khi lm cng tc hon thin, to mui luyn lng ng :n tVLVLB L K TNst

,_

+ +2. . . . 602 1 (m2/ca) (III.1.15)- Trong :B: Chiu rng san sa, B = 8mCc k hiu khc ging nh trn.n = 4 : s hnh trnh ca my san.=>17 , 222134 5 , 0 . 267 , 6610033 , 581008 . 100 . 85 , 0 . 7 . 60

,_

+ + N (m2/ca)6) t vn chuyn Huyndai 15T:- Nng sut ca t Hyundai 15Ttnh theo cng thc:tVLVLK K Q TNtt t+ +2 1. . . (m3/ca).(III.1.16)- Trong :+ T : Thi gian lm vic trong mt ca, T = 7(h).+ Kt: H s s dng thi gian, Kt = 0,85.+ Q: Dung tch ca thng, Q = 10m3.+ Ktt: H s sdng ti trng, Ktt= 1,0.+ L: C ly vn chuyn ca t.Khi t p l on I: L = 0,43Km.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 219 n Tt Nghip Khoa Xy Dng Cu - ngKhi t bi thi: L = 1,0Km+ V1 , V2 :Vn tc xe chy khi c ti v khi khng c ti V1 = 35km/h = 5, V2 = 45km/h + t : Thi gian bc d trong mt chu k, t =15pht = 0,25h.- Vn chuyn thnh chn, cc st:1 , 21625 , 0455 , 0355 , 01 . 85 , 0 . 10 . 7+ + N (m3/ca)- Khi t p l:9 , 21825 , 04543 , 03543 , 01 . 85 , 0 . 10 . 7+ + N (m3/ca)- Khi t bi thi:8 , 19725 , 04513511 . 85 , 0 . 10 . 7+ + N (m3/ca)7) Xe ti nc Xitec DM10:- Nng sut ca xe ti c tnh theo cng thc:b ptt tVLVLQ K TN+ + +2 1. .(m3/ca). (III.1.17)- Trong :+T : Thi gian lm vic trong mt ca T = 7h+Kt = 0,85 : h s s dng thi gian+Q: Dung tch ca xe ti nc, Q = 5000lt = 5 m3+L: c ly vn chuyn trung bnh+V1 = 25km/h , V2 = 40km/h : vn tc ca xe c ti v khng ti+tp = tb = 0,5h : thi gian phun nc, thi gian bm nc- Vy nng sut ca xe ti nc:93 , 275 , 0 5 , 04012515 . 85 , 0 . 7+ + + N ( m3/ca )5.7.2 Xc nh cc nh mc s dng nhn lc:- Cng tc ng cc, kim tra cao : 400 m/cng.-Cngtcornhngangthotnc:Nhncng3/7: 0,80cng/m3.(MXDCB 2005 M hiu: AB.1183)SVTH: Nguyn Vn Tu_Lp 02X3BTrang 220 n Tt Nghip Khoa Xy Dng Cu - ng- Cng tc dng v tho d thnh chn: 200 m/cng- San ri t p l 10 m3/cng.- Cng tc kim tra, nghim thu cui cng: 200m/cng.5.8 Tnh ton s cng-s ca cn thit hon thnh cc thao tc:Da vo khi lng cng tc ca on tuyn v nng sut my mc, nhn lc ta xc nh c s cng v s ca my hon thnh cc thao tc trong cng ngh thi cng mt ng. Kt qu trong ph lc 26.5.9 Xc nh phng php t chc thi cng:Cc cng vic p l hay o khun cc on tuyn c lin quan cht ch vi nhau, tuy nhin c khi lng cng tc khc nhau trong tng trng hp, nn ta chn phng php t chc thi cng dy chuyn l hp l hn c. 5.10 Bin ch cc t i thi cng:Da vo bng tnh s cng, s ca hon thnh cc hng mc cng vic ta bin ch t, i thi cng nh sau:+ T 1: 1 KS + 1 TC + 2 CN.+ T 2:15 Cng nhn.+ T 3:1 Xitec DM10.+ T 4A: 2 t Hyundai 15T.+ T 4B : 1 t Hyundai 15T.+ T 5: 1 San D465.+ T 6: 1m tay BPR45/55P, 1CN.+ T 7: 1 Lu D400A.+ T 8: 1 i D41P-6C.+ T 9 : 1 Xc lt WA95-3.5.11 Tnh ton thi gian hon thnh cc thao tc:Bng III.1.8: Bng tnh thi gian hon thnh cc thao tc.STT NI DUNG CNG VICS cng - s caS my-C.NhnT iTGHT (ca)I p l hon ton on KM1+00 KM1+6101nh v tim ng, mp phn xe chy, mp l gia c.2,50 4 1 0,632 Vn chuyn thnh chn, cc st. 0,01 1 4A 0,033 Dng thnh chn ln 1. 6,10 15 2 0,414 Ti nc to dnh bm vi nn t. 0,11 1 3 0,115Vn chuyn t t on II n p l ln 1.2,15 3 4AB 0,726Sanri t plngln1dy 18cm, 6lt/im.0,69 1 5 0,697 m cht l ng + b ph. 0,83 1 6 0,838 Tho thnh chn ln 1. 6,10 15 2 0,41SVTH: Nguyn Vn Tu_Lp 02X3BTrang 221 n Tt Nghip Khoa Xy Dng Cu - ng9 Dng thnh chn ln 2. 6,10 15 2 0,4110Ti nc to dnh bm vi lp di 2l/m2.0,08 1 3 0,0811Vn chuyn t t on II n p l ln 2.1,36 3 4AB 0,4512Sanri t plngln2dy 15cm, 6lt/im.0,52 1 5 0,5213 m cht l ng + b ph. 0,61 1 6 0,6114 Tho thnh chn ln 2. 6,10 15 2 0,4115 Dng thnh chn ln 3. 6,10 15 2 0,4116Ti nc to dnh bm vi lp di 2l/m2..0,06 1 3 0,0617Vn chuyn t t on II n p l ln 3.0,80 3 4AB 0,2718Sanri t plngln3dy 12cm.17,42 15 2 1,1619 m cht l ng + b ph. 0,44 1 6 0,4420 Tho thnh chn ln 3. 6,10 15 2 0,4121 o rnh ngang thot nc tm. 8,82 15 2 0,5922 San sa lng ng san, 4lt/im. 0,22 1 5 0,2223Lu tng cng lng ng 12/, V=3km/h.1,58 1 7 1,5824m mp phn lng ng bng m diezel .0,48 1 6 0,4825Cng tc kim tra, nghim thu khun ng.3,05 4 1 0,76II o lng hon ton on KM1+610 KM2+001San sa phn l ng to dc mui luyn, 4 6l/.0,02 1 5 0,022 m tng cng l ng. 0,28 1 6 0,283otlngngdy35cm,rng 7,8m.3,44 1 8 3,444Xc t ln t bng my xc lt 0,72 1 9 0,72Vn chuyn t o n p l on I.(*)4,30 3 4AB 1,435Xc t ln t bng my xc lt 0,42 1 9 0,42Vn chuyn t tha i. 2,78 3 4AB 0,936 o rnh ngang thot nc. 14,13 15 2 0,947Sansalngng, tomui luyn, 4lt/im.0,14 1 5 0,148Lu tng cng lng ng, 12lt/im, V=3km/h.1,01 1 7 1,019 m mp phn lng ng bng m0,31 1 6 0,31SVTH: Nguyn Vn Tu_Lp 02X3BTrang 222 n Tt Nghip Khoa Xy Dng Cu - ngdiezel .10Cng tc kim tra, nghim thu khun ng .1,95 4 1 0,49Ghi ch: (*): Khi lng ny tnh trong phn p l.5.12 Xc nh hng thi cng-lp tin thi cng khun ng:5.12.1 Xc nh hng thi cng:Hng thi cng c chn bt u t u on tuyn n cui on tuyn, tuy nhin cng tc o t nn o phc v p t l ng c trin khai khi thi cng p t l.5.12.2 Lp tin thi cng:Tin thi cng cng tc chun b c th hin bn v ph lc 27.6. THIT K T CHC THI CNG MT NG:6.1 Xc nh qui trnh thi cng v nghim thu:- Lp BTN cht ht trung loi I - Dmax20 thi cng v nghim thu theo quy trnh 22TCN 249-98.-LpBTNchthtlnloi II-Dmax25 thicngvnghimthu theoquytrnh 22TCN 249-98.- Lp cp phi dm loi I Dmax25 thi cng v nghim thu theo quy trnh 22TCN 334-06.- Lp cp phi dm loi I Dmax37,5 thi cng v nghim thu theo quy trnh 22TCN 334-06.6.2. Qui trnh thi cng v nghim thu lp CPD 22TCN 334-06:6.2.1 Thnh phn ht:Theo22TCN334-98tacthnhphnht (Th nghimTCVN4198-95hoc ASHTO127) ca cp phi dm nm trong gii hn quy nh bng III.1.1:Bng III.1.9: Thnh phn ht ca lp CPD.Kch c sn vung (mm)T l lt sn % theo khi lngDmax = 37,5mm Dmax = 25mm50 100 -37,5 95-100 10025 - 79-9019 58-78 67-839,5 39-59 49-644,75 24-39 34-542,36 15-30 25-40SVTH: Nguyn Vn Tu_Lp 02X3BTrang 223 n Tt Nghip Khoa Xy Dng Cu - ng0,425 7-19 12-240,075 2-12 2-126. 2.2 Cc ch tiu c l:Bng III.1.10:Cc ch tiu c l yu cu ca lp cp phi dm.STT Ch tiu k thut Yu cu Phng php thnghim1 hao mn Los_Angeles LA(%) 35 22TCN 318-042Ch s sc chu ti RCB ti cht K98,ngm nc 96h(%)100 22TCN 332-063 Gii hn chy WL (%) 25 AASHTO T89-024 Ch s do Ip(%) 6 AASHTO T90-025Ch s Ip x %lng lt qua sng 0,075456 Hm lng ht thoi dt(%) 15 TCVN 1772-877 m nn Kyc98 22TCN 333-066.2.3 Cng tc kim tra, nghim thu: Quy nh v ly mu vt liu CPD phc v cng tc kim tra nghim thu cht lng vt liu v lp mng CPD:- Mt ly mu, th nghim c quy nh trong quy trnh ny l ti thiu.Bng III.1.11: Bng yu cu khi lng ti thiu ly mu ti hin trng.C ht ln nht Dmax = 37,5mm Dmax = 25mmKhi lng mu ti thiu 125kg 100kg- Muth nghimclyphi i dincholsnphmhoccth nghim. Ty thuc vo mc ch kim tra v iu kin c th, vic ly mu c th thc hin theo cc phng thc khc nhau v tun th cc yu cu sau:o Khi ly mu ti ca x, phi m bo ly trn vn ton b vt liu x ra, khng c ri vi;o Khi ly mu trnbng ti, phi ly ht vt liu trn ton b mt ct ngang ca bng ti, c bit ch n cc ht mn;o Khng ly mu vt liu ti ca x hoc trn bang ti ca dy chuyn sn xut khi dy chuyn mi bt u ca sn xut, cha n nh;o Khi ly mu vt liu ti cc ng cha, vi mi ng gt b vt liu pha trn ng thnh mt mt phng c kch thc khng nh hn 50 50cm v o thnh h vung vn sao cho khi lng vt liu;SVTH: Nguyn Vn Tu_Lp 02X3BTrang 224 n Tt Nghip Khoa Xy Dng Cu - ngo Khi ly mu vt liu trn lp mng ri, phi o thnh h thng ng v ly ht vt liu theo chiu dy kt cu; Kim tra, nghim thu cht lng vt liu: Cng tc kim tra, nghim thu cht lng vt liu phi c tin hnh trong cc giai on sau:- Giai on kim tra phc v cho cng tc chp thun ngun cung cp vt liu CPD cho cng trnh;- Giai on kim tra phc ph cng tc nghim thu cht lng vt liu CPD c tp kt ti chn cng trnh a vo s dng; Kim tra trong qu trnh thi cng:Trong sut qu trnh thi cng n v phi tin hnh th nghim kim tra cc ni dung sau:- m, s phn tng vt liu CPD (quan st bng mt v kim tra thnh phn ht). C 200m3vt liu hoc mt ca thi cng phi ly mu th nghim kim tra thnh phn ht, m.- cht lu ln:+ Vic th nghim thc hin theo Quy trnh k thut xc nh dung trng ca t bng phng php rt ct 22TCN 13-79 hoc theo tiu chun AASHTO T191.+ n giai on cui ca qu trnh lu ln thng xuyn kim tra cht lu ln lm c s kt thc qu trnh lu ln. C 800m2 phi kim tra cht lu ln ti mt v tr ngu nhin.- Cc yu t hnh hc, bng phng:+ Cao , dc ngang ca lp mng c xc nh da trn s liu o cao ti tim v mp mng.+ Chiu dy lp mng c xc nh da trn s liu o c cao trc v sau khi thi cng.+ B rng lp mng c xc nh bng thc thp.+ bng phng c o bng thc 3m theo Qui trnh k thut o bng phng mt ng bng thc 3m 22TCN 16-79. Khe h ln nht di thc c qui nh ti bng III.1.12Bng III.1.12: Bng yu cu v kch thc hnh hc v bng phng ca lp mng CPD.Ch tiu kim traGii hn cho phpMt d kim traMng di Mng trnCao -10mm -5mm C 40 50m vi on tuyn thng, 20 25m vi on dc ngang t 0,5% t 0,3%SVTH: Nguyn Vn Tu_Lp 02X3BTrang 225 n Tt Nghip Khoa Xy Dng Cu - ngtuyn cong bng hoc cong Chiu dy t 10mm t 5mmB rng -50mm -50mm bng phng: khe h ln nht di thc 3m 10mm 5mm C 100m o tai 1 v tr Kim tra nghim thu cht lng thi cng:- i vi cht lu ln: c 7.000m2 hoc 1km (i vi ng 2 ln xe) kim tra ti 2 v tr ngu nhin (trng hp ri bng my san kim tra ti 3 v tr ngu nhin).- i vi cc yu t hnh hc bng phng mt kim tra bng 20% khi lng quy nh bng (III.1.12).6.3. Qui trnh thi cng v nghim thu lp BTN 22TCN 249-98:6.3.1 Thnh phn htca BTN cht (BTNC):Bng III.1.13: Bng thnh phn ht ca BTNC.Theo b sng l trn (mm)Theo sng l vung ASTM (mm)Lng ltqua sng (%)Lng nha tnh theo % ct liuBTNC 20 BTNC 25 BTNC 20 BTNC 25 BTNC 20 BTNC 2531,5 25 - 1005,06,0 5,06,0 25 19 100 95-10020 16 95100 -15 12,5 8189 76-845,06,0 5,06,010 8 6575 60-705 4 4357 43-572,5 2 3144 31-441,25 1 2233 22-330,63 0,5 1624 16-240,315 0,3 1218 12-180,14 0,16 813 8-130,071 0,075 510 5-106.3.2 Cc yu cu v cc ch tiu l ca (BTNC):Bng III.1.14: Bng yu cu cc ch tiu c l ca BTNC.STT Cc ch tiuYu cu i vi b tng nha loiPhng phpth nghimI IIa) Th nghim theo mu nn hnh tr:SVTH: Nguyn Vn Tu_Lp 02X3BTrang 226 n Tt Nghip Khoa Xy Dng Cu - ng1 rng ct liu khong cht, % th tch 15-19 15-21Quy trnhth nghimb tng nha22 TCN 62-842 rng cn d, % th tch 3-6 3-63 ngm nc, % th tch 1,5-3,5 1,5-4,54 n, % th tch, khng ln hn 0,5 1,05Cng chu nn, daN/cm2, nhit +) 200C khng nh hn+)500C khng nh hn3514 25126 H s n nh nc, khng nh hn 0,90 0,857H s n nh nc, khi cho ngm nc trong 15 ngy m; khng nh hn0,85 0,758 n, % th tch, khi cho ngm nc trong 15 ngy m, khng ln hn1,5 1,8b) Th nghim theo phng php Marshall: (mu m 75 c mi mt)1 n nh (Stability) 600C, kN, khng nh hn8,00 7,50AASHTO-T245hocASTM- D1 559-952Ch s do quy c (flow) ng viS = 8kN, mm, nh hn hay bng4,0 4,03 Thng s Marshall (Marshall Quotient) n nh (Stability)kN Ch s do quy c (flow)mmmin 2,0max 5,0min 1,8max 5,04 n nh cn li sau khi ngm mu 600C, 24h so vi n nh ban u, % ln hn75 755 rng b tng nha (Air voids) 3-6 3-66 rng ct liu (Voids in mineral aggregate) 14-18 14-20c) Ch tiu khc:1 dnh bm vt liu nha i vi Kh t yu cuQT th nghim vt liu nha ng 22TCN 63-84Ghi ch: C th s dng mt trong hai phng php th nghim a hoc b.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 227 n Tt Nghip Khoa Xy Dng Cu - ng6.3.3 Cc yu cu v cht lng vt liu ch to BTN:a) dm:- dm dng trong hn hp BTN c xay t tng, ni, t cui si, t x l cao khng b phn hy.- Khng dng dm xay t mc-n, sa thch st, dip thch st.- Cc ch tiu c l ca dm dng cho btng nha lm lp mt, ri nng phi tha mn cc quy nh bng sau:Bng III.1.15: Bng yu cu cc ch tiu c l ca dm trong BTN ri nng.Cc ch tiu c l ca BTNCLoi I lp trnBTNCLoi II lp diPhng phpth nghim1.Cng chu nn (daN/cm2) khng nh hna) dm xay t macma v bin chtb) dm xay t trm tch1000800800600TCVN 1771,1772-87 (lychng chtni sn xut )2. nn dp trong xi lanh ca dmxay t si cui khng ln hn, %8 12TCVN 1771,1772-873. nn dp ca dm xay t x l cao + Loi + Khng ln hn, %1152254. hao mn LosAngeles(LA), khng ln hn %25 35 AASHTO-T965. Hm lngcui si c xay v trong tng s cui si, % khi lng khng nh hn100 80 Bng mt6. T s nghin ca cui siRC = Dmin /dmaxkhng nh hn.4 4Bng mt kt hp vixc nh bng sng7. dnh bm vi nha t cp 3 tr ln (22 TCN 63-84)Ghi ch : Dmin- C nh nht ca cui si em xaydmax- C ln nht ca vin xay ra c- Lng dm mm yu v phong ha khng c qu 10% khi lng i vi btng nha ri lp trn. (Xc nh theo TCVN1771,1772-87).SVTH: Nguyn Vn Tu_Lp 02X3BTrang 228 n Tt Nghip Khoa Xy Dng Cu - ng- Lng thoi dt ca dm khng c qu 15% khi lng dm trong thnh phn hn hp. (Xc nh theo TCVN1771,1772-87).- Trong cui si xay khng c qu 20% khi lngl loi gc silic.- Hm lng bn, bi, st khng vt qu 2% khi lng, trong hm lng st khng qu 0,05% khi lng . (Xc nh theo TCVN1771,1772-87).- Trc khi cn ong s b a vo trng sy, dm cn phi phn loi theo cc c ht: i vi BTN ht trung Dmax20, Dmax25 phn ra t nht 3 c ht 15-20 (25)mm; 10-15mm; 5-10mm.b) Ct:- ch to b tng nha phi dng ct thin nhin hoc ct xay. dng xay ct phi c cng chu nnkhng nh hn ca dng sn xut ra dm.- Ct thin nhin phi c mun ln MK >2. Trng hp MK 63 , 1031 , 0451035100 , 1 . 9 , 0 . 10 . 7+ + P (m3/ca).4) Xe ti nha D164A, xe ti nc DM10:- Nng sut tnh theo cng thc (III.1.17)b ptt tVLVLQ K TN+ + +2 1. .(m3/ca).- Xe ti nha D164A: L = 10Km.03 , 185 , 0 5 , 0401025105 . 85 , 0 . 7+ + + N ( m3/ca )- Xe ti nc DM10: L = 1Km.93 , 275 , 0 5 , 04012515 . 85 , 0 . 7+ + + N ( m3/ca )5) Nng sut my nn kh DK9: N = 7000 (m2/ca)6) Nng sut m tay BPR45/55D: m mp N = 360 (m/h) = 2520 (m/ca)7) nh mc s dng nhn lc:- Cng tc lp rnh ngang thot nc : 0,81cng/m3.- Cng tc san sa hon thin l t, no vt rnh bin : 200 m/cng.- Chi sch mt ng bng bn chi st: 500m2/cng.- Cng tc kim tra, nghim thu cui cng: 200m/cng.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 258 n Tt Nghip Khoa Xy Dng Cu - ng6.10 Tnh ton s cng-s ca my cn thit hon thnh cc thao tc trong cng ngh thi cng:Da vo khi lng cng tc ca on tuyn v nng sut my mc, nhn lc ta xc nh c s cng v s ca my hon thnh cc thao tc trong cng ngh thi cng mt ng. Kt qu trong ph lc 29.6.11 Bin ch t i thi cng:Da vo bng tnh s cng, s ca hon thnh cc hng mc cng vic ta bin ch t, i thi cng nh sau:+ T 1: 1 K s + 1 Trung cp + 2 Cng nhn.+ T 2A: 8 Cng nhn. (Lm cng tc b ph cng my ri NBF6 WS-TS v lp t rnh ngang)+ T 2B: 8 Cng nhn. (Lm cng tc b ph cng my lu VM7706 v lm mts cng vic khc)+ T 2C : 1 Cng nhn. ( Lm cng tc m mp bng my m BPR45/55D v thi bi bng my nn kh)+ T 2D : 4 Cng nhn.+ T 3:1 Xitec DM10.+ T 4A: 3 t Hyundai 15T.+ T 4B: 4 t Hyundai 15T.+ T 4C: 1 t Hyundai 15T.+ T 5 : 1 Xe ti D164A.+ T 6: 1 m tay BPR45/55D + 1 Cng nhn (T 2C).+ T 7: 1 Lu D400A.+ T 8: 1 My ri NBF6 WS-TS + 8 Cng nhn b ph (T 2A).+ T 9: 2 Lu VM7706 + 8 Cng nhn b ph (T 2B).+ T 10: 1 Lu rung KVR11.+ T 11A: 2 Lu bnh lp BW11RH.+ T 11B: 2 Lu bnh lp BW11RH.+ T 12 : 1 My nn kh DK9 + 1 Cng nhn (T 2C).6.12 Tnh ton thi gian hon thnh cc thao tc trong cng ngh thi cng:Bng III.1.27: Bng s thi gian hon thnh cc thao tc thi cng cc lp mt ng.STTNI DUNG CNG VICS cng - s caS my-C.NhnT iTh.gian h.thnh (ca)I Thi cng lp cp phi dm loi I Dmax37,5 dy 18cm.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 259 n Tt Nghip Khoa Xy Dng Cu - ng1 Ti m lng ng 2l/m2. 0,57 1 3 0,572 Vn chuyn CPD loi I Dmax37,5 . 18,06 8 4ABC 2,263 Ri CPD loi I Dmax37,5. 1,49 1 8 1,494Lu ln s b bng lu nh bnh st 4lt/im, V=2km/h.2,78 2 9 1,39B ph. 2,43 8 2B 1,22m mp. 0,79 1 6 0,795Lu ln cht bng lu rung 8lt/im, V = 3Km/h.2,69 1 10 2,696Lu ln cht bng lu bnh lp 24lt/im, V = 5km/h.5,60 4 11AB 1,407Lu ln hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.1,16 1 7 1,168Lp rnh thot nc tm ln 1 cao 18cm + h t su 50cm.6,63 8 2A 0,839Kim tra v nghim thu lp CPD loi I Dmax37,5.5,00 4 1 1,25II Thi cng lp cp phi dm loi I Dmax25 dy 15cm.10Ti m to dnh bm vi lp mng di 2l/m2.0,57 1 3 0,5711 Vn chuyn CPD loi I Dmax25. 15,05 8 4ABC 1,8812 Ri CPD loi I Dmax25. 1,49 1 8 1,4913B ph. 2,78 2 9 1,39Lu ln s b bng lu nh bnh st 4lt/im, V=2km/h.2,43 8 2B 1,22m mp. 0,79 1 6 0,7914Lu ln cht bng lu rung 8lt/im, V = 3Km/h.2,69 1 10 2,6915Lu ln cht bng lu bnh lp 21lt/im, V = 5km/h.4,90 4 11AB 1,2316Lu ln hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.1,16 1 7 1,1617 Lp rnh thot nc tm ln 2 cao 15cm. 1,54 8 2A 0,1918Kim tra v nghim thu lp CPD loi I Dmax25.5,00 4 1 1,2519 Chi sch mt ng bng bn chi st.16,00 5 2D 3,2020 Thi bi bng my nn kh. 1,14 1 12 1,1421Ti nha thm bng nh tng nha 1,2lt/m2.0,53 1 5 0,53III Thi cng lp btng nha cht loi II Dmax25 dy 7cm22 Lp rnh thot nc tm ln 3 cao 12cm. 0,92 5 2D 0,1823 Lm sch mt ng bng my nn kh. 1,14 1 12 1,1424 Ti nha dnh bm dng nha nng0,53 1 5 0,53SVTH: Nguyn Vn Tu_Lp 02X3BTrang 260 n Tt Nghip Khoa Xy Dng Cu - ng1,2lt/m2.25Vn chuyn hn hp btng nha loi II Dmax25.7,02 7 4AB 1,0026 Ri hn hp btng nha loi II Dmax25. 1,49 1 8 1,4927B ph. 3,26 2 9 1,63Lu ln s b bng lu nh bnh st 4lt/im, V=2km/h.2,85 8 2B 1,43m mp. 0,79 1 6 0,7928Lu ln cht bng lu bnh lp 18lt/im, V = 5km/h .5,63 4 11AB 1,4129Lu hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.1,40 1 7 1,4030Kim tra v nghim thu lp BTNC loi II Dmax25.5,00 4 1 1,25IV Thi cng lp btng nha loi I Dmax20 dy 5cm31 Lm sch mt ng bng my nn kh. 1,14 1 12 1,1432Ti nha dnh bm dng nha nng 1,2lt/m2.0,22 1 5 0,2233Vn chuyn hn hp btng nha loi I Dmax20.5,02 5 4BC 1,0034 Ri hn hp btng nha loi I Dmax20. 1,49 1 8 1,4935Lu ln s b bng lu nh bnh st 3lt/im, V=2km/h.2,45 2 9 1,23B ph. 2,14 12 2B 1,0736Lu ln cht bng lu bnh lp 14lt/im, V = 5km/h .5,47 4 11AB 1,3737Lu hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.1,40 1 7 1,4038Kim tra v nghim thu lp BTNC loi I Dmax20.5,00 4 1 1,2539 San sa hon thin l t, no vt rnh bin. 5,00 5 2D 1,0040 Hon thin v bn giao cng trnh.6.13 Lp tin thi cng ch o mt ng: Th hin trn bn v s 14CHNG IITHIT K T CHC THI CNGCHI TIT DY CHUYN MT NG1. XC NH KHI LNG VT LIU, KHI LNG CNG TC CHO ON TUYN DY CHUYN:1.1 Xc nh khi lng vt liu cho on dy chuyn 160m:Khi lng vt liu cho mt on dy chuyn 160m c ph lc 30.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 261 n Tt Nghip Khoa Xy Dng Cu - ng1.2 Xc nh khi lng cng tc cho on dy chuyn 160m:Khi lng cng tc cho mt on dy chuyn 160m c ph lc 31.2. TNH TON S CNG-CA CN THIT HON THNH CC THAO TC TRONG ON DY CHUYN:Bngtnhscng-scahonthnhccthaotctrong1ondychuynmt ng ph lc 32.3. TNH TON TNG S CNG-CA MY CN THIT TRONG CNG NGH THI CNG:Bng III.2.1: Bng tnh tng s cng-s ca cn thit trong cng ngh thi cng ca on dy chuyn mt ng di 160m.STT Tng thi gian lm vic ca cc my mc-nhn cng Thi gian (ca)1 Nhn cng 21,892 My lu VM7706 1,813 My lu KVR11 0,864 My lu BW11RH 3,465 My lu D400A 0,826 Xe ti nc DM10 0,217 Xe ti nha D164A 0,228 My ri NFB6 WS-TS 0,969 My nn kh DK9 0,5410 My m tay BPR45/55D 0,3911 t Huyndai 15T 7,224. BIN CH T I THI CNG:Da vo bng tnh s cng, s ca hon thnh cc hng mc cng vic ta bin ch t, i thi cng nh sau:+ T 1: 1 K s + 1 Trung cp + 2 Cng nhn.+ T 2A: 8 Cng nhn. (Lm cng tc b ph cng my ri NBF6 WS-TS v lp t rnh ngang)+ T 2B: 8 Cng nhn. (Lm cng tc b ph cng my lu VM7706 v lm mts cng vic khc)SVTH: Nguyn Vn Tu_Lp 02X3BTrang 262 n Tt Nghip Khoa Xy Dng Cu - ng+ T 2C : 1 Cng nhn. ( Lm cng tc m mp bng my m BPR45/55D v thi bi bng my nn kh)+ T 2D : 4 Cng nhn.+ T 3:1 Xitec DM10.+ T 4A: 3 t Hyundai 15T.+ T 4B: 4 t Hyundai 15T.+ T 4C: 1 t Hyundai 15T.+ T 5 : 1 Xe ti D164A.+ T 6: 1 m tay BPR45/55D + 1 Cng nhn (T 2C).+ T 7: 1 Lu D400A.+ T 8: 1 My ri NBF6 WS-TS + 8 Cng nhn b ph (T 2A).+ T 9: 2 Lu VM7706 + 8 Cng nhn b ph (T 2B).+ T 10: 1 Lu rung KVR11.+ T 11A: 2 Lu bnh lp BW11RH.+ T 11B: 2 Lu bnh lp BW11RH.+ T 12 : 1 My nn kh DK9 + 1 Cng nhn (T 2C).5. TNH TON THI GIAN HON THNH CC THAO TC TRONG ON DY CHUYN:BngIII.2.2:Bngtnhthigiancnthit honthnhccthaotctrongondy chuyn mt ng di 160m.STT NI DUNG CNG VICS cng - s caS my-C.NhnT iTGHT (ca)TGHT (h)I Thi cng lp cp phi dm loi I Dmax37,5 dy 18cm.1 Ti m lng ng 2l/m2. 0,09 1 3 0,09 0,722 Vn chuyn CPD loi I Dmax37,5. 2,89 8 4ABC 0,36 2,533 Ri CPD loi I Dmax37,5. 0,24 1 8 0,24 1,684Lu ln s b bng lu nh bnh st 4lt/im, V=2km/h.0,45 2 9 0,23 1,58B ph. 0,39 8 2B 0,20 1,58m mp. 0,13 1 6 0,13 0,915Lu ln cht bng lu rung 8lt/im, V = 3Km/h.0,43 1 10 0,43 3,016Lu ln cht bng lu bnh lp 24lt/im, V = 5km/h.0,90 4 11AB 0,23 1,587Lu ln hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.0,19 1 7 0,19 1,33SVTH: Nguyn Vn Tu_Lp 02X3BTrang 263 n Tt Nghip Khoa Xy Dng Cu - ng8Lp rnh thot nc tm ln 1 cao 18cm + h t su 50cm.1,06 8 2A 0,13 1,069Kim tra v nghim thu lp CPD loi I Dmax37,5.0,80 4 1 0,20 1,60II Thi cng lp cp phi dm loi I Dmax25 dy 15cm.10Ti m to dnh bm vi lp mng di 2l/m2.0,09 1 3 0,09 0,7211 Vn chuyn CPD loi I Dmax25. 2,41 8 4ABC 0,30 2,1112 Ri CPD loi I Dmax25. 0,24 1 8 0,24 1,6813Lu ln s b bng lu nh bnh st 4lt/im, V=2km/h.0,45 2 9 0,23 1,58B ph. 0,39 8 2B 0,20 1,58m mp. 0,13 1 6 0,13 0,9114Lu ln cht bng lu rung 8lt/im, V = 3Km/h.0,43 1 10 0,43 3,0115Lu ln cht bng lu bnh lp 21lt/im, V = 5km/h.0,78 4 11AB 0,20 1,3716Lu ln hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.0,19 1 7 0,19 1,3317Lp rnh thot nc tm ln 2 cao 15cm.0,25 8 2A 0,03 0,2518Kim tra v nghim thu lp CPD loi I Dmax25.0,80 4 1 0,20 1,6019Chi sch mt ng bng bn chi st. (sau khi ch CPD kh se)2,56 5 2D 0,51 4,1020 Thi bi bng my nn kh. 0,18 1 12 0,18 1,2621Ti nha thm bng nh tng nha 1,2lt/m2.0,09 1 5 0,09 0,63III Thi cng lp btng nha cht loi II Dmax25 dy 7cm22Lp rnh thot nc tm ln 3 cao 12cm.0,15 5 2D 0,03 0,2423Lm sch mt ng bng my nn kh.0,18 1 12 0,18 1,2624Ti nha dnh bm dng nha nng 1,2lt/m2.0,09 1 5 0,09 0,6325Vn chuyn hn hp btng nha loi II Dmax25.1,12 7 4AB 0,16 1,1226Ri hn hp btng nha loi II Dmax25.0,24 1 8 0,24 1,6827Lu ln s b bng lu nh bnh st 4lt/im, V=2km/h.0,52 2 9 0,26 1,82B ph. 0,46 8 2B 0,23 1,82m mp. 0,13 1 6 0,13 0,91SVTH: Nguyn Vn Tu_Lp 02X3BTrang 264 n Tt Nghip Khoa Xy Dng Cu - ng28Lu ln cht bng lu bnh lp 18lt/im, V = 5km/h .0,90 4 11AB 0,23 1,5829Lu hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.0,22 1 7 0,22 1,5430Kim tra v nghim thu lp BTNC loi II Dmax25.0,80 4 1 0,20 1,60IV Thi cng lp btng nha loi I Dmax20 dy 5cm31Lm sch mt ng bng my nn kh.0,18 1 12 0,18 1,2632Ti nha dnh bm dng nha nng 1,2lt/m2.0,04 1 5 0,04 0,2833Vn chuyn hn hp btng nha loi I Dmax20.0,80 5 4BC 0,16 1,1234Ri hn hp btng nha loi I Dmax20.0,24 1 8 0,24 1,6835Lu ln s b bng lu nh bnh st 3lt/im, V=2km/h.0,39 2 9 0,20 1,37B ph. 0,34 12 2B 0,17 1,3736Lu ln cht bng lu bnh lp 14lt/im, V = 5km/h .0,88 4 11AB 0,22 1,5437Lu hon thin bng lu nng bnh st 4lt/im, V = 2,5km/h.0,22 1 7 0,22 1,5438Kim tra v nghim thu lp BTNC loi I Dmax20.0,80 4 1 0,20 1,6039San sa hon thin l t, no vt rnh bin.0,80 5 2D 0,16 1,2840 Hon thin v bn giao cng trnh.Bng III.2.3: Bng h s s dng thi gian ca cc t i thi cng trong 1 dy chuyn mt ng.T iH s s dng TGSL NC-MT 1 0,80 4 NCT 2A 1,00 8 NCT 2B 0,79 8 NCT 2C 0,81 1 NCT 2D 0,70 4 NCT 3 0,21 1 DM10T 4A 0,82 3 TT 4B 0,98 4 TT 4C 0,82 1 TT iH s s dng TGSL NC-MT 5 0,22 1 D164AT 6 0,39 1 MSVTH: Nguyn Vn Tu_Lp 02X3BTrang 265 n Tt Nghip Khoa Xy Dng Cu - ngT 7 0,82 1 D400AT 8 0,96 1 NFB6T 9 0,91 2 VM7706T 10 0,86 1 KVR11T 11A 0,87 2 BW11RHT 11B 0,87 2 BW11RHT 12 0,54 1 DK96. XC LP S CNG NGH THI CNG:Ghi ch:1) Xe ti nc DM10.2) t Huyndai 15T.3) My ri NFB6 WS-TS.4) Lu bnh st VM7706.5) Lu rung KVR11.6) Lu bnh lp BW11RH.7) Lu bnh st D400A.8) Xe ti nha D164A.9) m tay Bomag BPR45/55P.10)My nn kh DK9.SVTH: Nguyn Vn Tu_Lp 02X3BTrang 266 n Tt Nghip Khoa Xy Dng Cu - ng899 0 05 0 5 08 0 0432145BNH O DAY CHUYEN CONG NGHE THI CONG LP MONG TREN CPD Dmax256666776666BNH O DAY CHUYEN CONG NGHE THI CONG LP MONG DI CPD Dmax37,55412348 0 05 0 5 09 0 0910SVTH: Nguyn Vn Tu_Lp 02X3BTrang 267 n Tt Nghip Khoa Xy Dng Cu - ng48 0 05 0 5 09 0 098BNH O DAY CHUYEN CONG NGHE THI CONG LP MAT DI BTNC Dmax25BNH O DAY CHUYEN CONG NGHE THI CONG LP MAT TREN BTNC Dmax20899 0 05 0 5 08 0 0432466667101076666423SVTH: Nguyn Vn Tu_Lp 02X3BTrang 268