Le van hung 3.2008

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<ul><li> 1. GII PHP HP L KHI CHUYN TRC LN CAO TRONG THI CNG CC TA NH C CHIU CAO LNKS. L VN HNGVin KHCN Xy dng1. Tnh hnh xy dng cc ta nh c chiu cao ln Vit Nam Trong nhng nm gn y, cc d n xy dng ta nh c chiu cao ln (TNCCCL) c trinkhai rng ri ti H Ni, Tp. H Ch Minh v cc tnh, thnh ph ln khc trong c nc. Ti ccthnh ph ln nh Tp. H Ch Minh, H Ni c th k ra nhiu cc cng trnh cao tng nh: Trungtm thng mi Si Gn (34 tng), Thun Kiu Plaza (33 tng), Si Gn Centre (27 tng) to nhM3-M4 Nguyn Ch Thanh (25 tng), Trung Ho - Nhn Chnh (34 tng), to nh VietcomBank 194Trn Quang Khi (22 tng), cc khu th nh Cng, Linh m, M nh vi cc to nh cchiu cao t 9 n 21 tng v cn c cc d n khc ang trin khai xy dng nh KaengNam (70tng) ng Phm Hng, Lankmark ph o Tn (65 tng). Trn th gii c cc cng trnh c chiu cao ln ti 400-500m trong khi Vit Nam, chiu caoca cc cng trnh mi ch khong 120m tng ng vi ta nh 40 tng. iu ni ln rng vic xydng cc TNCCCL nc ta mi ch giai on u. Chnh v vy, chng ta cn rt nhiu vn cnnghin cu, trong c cc vn v m bo thng ng v b tr chnh xc cc hng mc ca tonh khi thi cng ln cao. Hnh1. S dng thit b thu GPS chuyn trc cngtrnh2. La chn gii php truyn trcTruyn to v cao l cng vic phi c thc hin thng xuyn trong qu trnh xy dngphn thn cc to nh cao tng. m bo thng ng ca to nh trn sut chiu cao, trc cngtrnh ti tt c cc tng xy dng u phi c nh v sao cho cng nm trong mt mt phng thngng i qua cc trc tng ng trn mt bng gc. Ngha l cc im to ca li b tr c s lp trn mt bng gc s c chuyn ln mt sn thi cng xy dng ca cc tng theo mt ngthng ng. m bo iu kin ny cn thit phi truyn to t mt bng c s ln tt c cctng cn li ca to nh. Qu trnh truyn to t mt bng c s ln cc mt bng xy dng l mtdng cng vic rt quan trng khi xy dng TNCCCL.2.1. Truyn ta t mt bng c s ln cc tng bng my kinh vThc cht ca vic truyn ta t mt bng c s ln cc tng bng my kinh v l phng phps dng mt phng ng ca my kinh v. y l phng php chiu im bng tia ngm nghing, cth thc hin nhng ni iu kin xy dng rng ri, cng trnh xy dng c s tng t hn 4.Phng php ny khng ph hp cho nhng nh c s tng cao hn v nhng nh xy chen mt bngxung quanh cht hp.2. 2. Truyn ta t mt bng c s ln cc tng bng my ton c in t (TT)2.2.1. Ni dung phng phpi vi cng trnh nh cao tng xy dng trn mt bng tng i rng ri v chiu cao cng trnhkhng vt qu 10 tng, c th s dng my ton c in t chuyn v tr cc im li c s lnmt sn. Thc cht l chuyn ta t im nh du mt bng gc ln sn thi cng. Cc myton c in t s dng chuyn im ln cao phi c sai s o cnh &lt; 5mm, sai s o gc &lt; 5". thc hin phng php ny cn m bo iu kin thng hng gia cc im trn mt t v</li></ul> <p> 2. cc im trn tng sn cng trnh, ng thi phi m bo gc nghing ng knh khng qu ln (</p>