KHI QUT V CNG TRNH1. TN D N: CHUNG C AMI TOWER. - a im xy dng: 81 Trng Thi - P. Trng Thi - TP. Thanh Ho. - Ch u t: Cng ty c phn Trng Thi Thanh Ho. - n v thi cng: Cng ty c phn TXD HUD401. 2. QUY M D N: Cng trnh c thit k tng th l mt cng trnh hp khi bao gm 02 tng hm, 11 tng cao v mt khi nh 5 tng. C th nh sau: a, Xy dng khi chung c cao tng: - Tng hm: xe v cc phng k thut. - Tng 1: Dch v cng cng. - Tng 2-11: Cn h chung c. b, Xy dng khi nh 5 tng: - Tng 1: xe kt hp dch v. - Tng 2 : Nh . 3. CC CH TIU CHNH: Cp cng trnh Tng din tch khu t Din tch xy dng Tng cao nht : Cp II : 3.687m2 : 2.495m2 : 11 tng

PHNG N QUAN TRC LN1. C S LP PHNG N. - Nhim v quan trc ln Cng trnh; - H s ti liu thit k cng trnh (Mt bng tng th cng trnh, bn v thit k h thng li ct...); - Lut Xy dng s 11/2003/QH 11 ngy 26/11/2003 ca Quc Hi; - Ngh nh s 12/2009/N-CP ngy 12/02/2009 ca Chnh ph v vic Qun l d n u t xy dng cng trnh, - Ngh nh s 209/2004/N-CP ngy 16/12/2004 ca Chnh ph v Qun l cht lng cng trnh xy dng; 2. MC CH. Cng tc quan trc ln cng trnh c thc hin nhm cc mc ch sau: - Xc nh cc gi tr ln ( ln lch, tc ln trung bnh...) ca cng trnh so vi cc gi tr tnh ton theo thit k; - nh gi kh nng lm vic v n nh ca nn mng cng trnh trong qu trnh xy dng v s dng sau ny; 3. NI DUNG. 3.1 Tiu chun p dng - TCXD 271:2002 Quy trnh k thut xc nh ln cng trnh dn dng v cng nghip bng phng php o cao hnh hc; - Quy phm xy dng li cao nh nc hng I, II, III v hng IV; 3.2 Mc quan trc a) Mc chun Trc khi quan trc ln cng trnh cn xy dng li cc mc chun. Khi o ln mc chun l cc mc khng ch cao dng lm c s xc nh ln ca cng trnh, khong cch t mc chun n cng trnh thng t 50m n 100m. Cc mc chun phi m bo n nh trong sut qu trnh quan trc v cho php kim tra n nh ca cc mc quan trc gn trn cc kt cu cng trnh, m bo cc yu cu trn, mc chun phi tho mn cc yu cu sau: - S lng mc chun ti thiu l 3 mc; - Nm ngoi phm vi nh hng ln ca cng trnh, xa ngun gy ra chn ng ln; - Gi c cao n nh trong sut qu trnh o ln cng trnh; - Cho php kim tra mt cch tin cy n nh ca cc mc khc;

- Cho php dn cao n cc mc o ln mt cch thun li, trng hp khi o chnh cao gia hai im (mc chun n mc quan trc, gia cc mc quan trc vi nhau) m khng nhn thy trc tip bng mt trm my th c th dng cc truyn cao. Cc: L dng c t mia chuyn cao khi o chnh cao gia hai im khng nhn thy trc tip bng mt trm my (TCXD 271:2002) - Trong trng hp c th ng l phi xy dng mt cm gm 3 mc, khoan su ~35m, nhng do cng trnh c kch thc kh nh nm chen st khu dn c, nn khng th b tr mc trong khu vc xy dng v cng khng b tr c trn va h. Do vn dng iu 7.1.2 trong TCXDVN 271-2002 chng ti s li dng cc cng trnh c, n nh t mc c s theo dng n gin (gn du mc trn mt b tng, hay trn cc cng trnh c, bu lng chn ct n hay s dng cc mc xy c ca Tng cc a chnh nm gn cng trnh). y ta s chn mc RP1, RP2, RP3 s l mc gn trn tng trng PTTH Trng Thi. b) Mc quan trc ln Mc o ln l mc c gn trc tip vo cc v tr c trng ca cc kt cu chu lc trn mng hoc thn cng trnh, dng quan trc ln (ln, tri), h thng mc o ln c thit k v b tr m bo cc yu cu sau: - C kt cu vng chc, n gin v thun tin cho vic o c; - B tr m bo phn nh mt cch y v ln v nghing ca ton cng trnh v cc iu kin o c (cc v tr c trng v ln khng u, cc v tr d on ln mnh, cc v tr c trng v a cht cng trnh, hai bn khe ln, ni c thay i ti trng, thang my), trnh s ph hng hoc mt tc dng o c trong cc chu k sau; - S lng mc quan trc ln c tnh ton thch hp sao cho va phn nh c c trng gi tr o c, va m bo tnh kinh t; - Cn c vo cc c im nn mng v kt cu cng trnh d kin b tr 10 mc quan trc ti tng hm ca cng trnh m bo n nh v trnh s va chm trong qu trnh thi cng v hon thin. V tr cc mc: C bnh s ho km theo. 3.3 Thit b s dng S dng my thy bnh chnh xc cao .. v mia Invar quan trc ln cng trnh. 3.4 Phng php quan trc ln - Phng php s dng ph bin o ln nh v cng trnh l phng php o cao hnh hc quy nh trong tiu chun TCXDVN 271: 2002 Quy trnh k thut xc nh ln cng trnh dn dng v cng nghip bng phng php o cao hnh hc. - Ni dung ca phng php l xc nh cao cc mc o ln (c gn ti cc v tr thch hp trn hng mc cng trnh) theo cao gi nh ca h thng mc chun bng phng php thy chun hnh hc tia ngm ngn.

- Vic quan trc ln tin hnh theo cc chu k, gi tr ln ca tng mc trong mi chu k o c xc nh da trn chnh cao gia hai ln o (hai chu k). - Trong qu trnh o c cn tun th cc hn sai trong qui phm qui nh i vi thu chun Hng II Nh nc vi mt s ch tiu k thut ch yu nh sau: + Chiu di tia ngm nh hn 25 mt; + Chnh lch khong cch t my n mia trc v mia sau khng c vt qu 1 mt. Tuy nhin tu thuc vo iu kin mt bng cng trnh m chnh lch khong ngm c th ti ln hn; + Sai s khp vng fh phi tho mn: fh