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f9488a8cf8 Nu cp pha c lp lin vi ct thp th phi tnh c khi lng ct thp, h s vt ti i vi ti trng gi ly bng 1,2 v 0,8 i vi cc ti trng chng lt. 6.8.3. Ct thp trc khi gia cng v trc khi b tng cn m bo: a) B mt sch, khng dnh bn t, du m, khng c vy st v cc lp g; b) Cc thanh thp b bp, b gim tit din do lm sch hoc do cc nguyn nhn khc khng vt qu gii hn cho php l 2% ng knh. b) Theo chiu cao. Vic vn chuyn ct thp gia cng m bo cc yu cu sau: a) Khng lm h hng v bin dng sn phm ct thp; b) Ct thp tng thanh nn buc thnh tng l theo chn loi v s lng trnh nhm ln khi s dng; c) Cc khung, li ct thp ln nn c bin php phn chia thnh tng b phn nh ph hp vi phng tin vn chuyn. 7.1. st ca hn hp b tng c kim tra ti hin trng theo cc quy nh sau: a) i vi b tng trn ti hin trng cn kim tra ngay sau khi trn m b tng u tin. Khi thi cng b tng khi ln trong thi tit nng phi m bo cc quy nh ca phn 6.8. B.2.
Trong qu trnh trn trnh hn hp bm dnh vo thng trn, c sau 2 gii lm vic cn vo thng trn ton b ct liu ln v nc ca mt m trn v quay Tiu chun vit nam tcvn 4453 : 1995 19 my trn khong 5 pht, sau cho ct v xi mng vo trn tip theo thi gian quy nh. Khi nghim thu phi c h s bao gm: a) Cc bn v thit k c ghi y s thay i v ct thp trong qu trnh thi cng v km bin bn v quyt nh thay i; b) Cc kt qu kim tra mu th v cht lng thp, mi hn v cht lng gia cng ct thp; c) Cc bin bn thay i ct thp trn cng trng so vi thit k; d) Cc bin bn nghim thu k thut trong qu trnh gia cng v lp dng ct thp; e) Nht k thi cng. Bng A.1 p lc ngang ca hn hp b tng mi Phng php m Cng thc tnh ton p lc ngang ti a, daN/m2 Gii hn s dng cng thc 1. Kim tra cng tc ct thp bao gm cc phn vic sau: a) S ph hp ca cc loi ct thp a vo s dng so vi thit k; b) Cng tc gia cng ct thp; phng php ct, un v lm sch b mt ct thp trc khi gia cng. 7.1.4. Trng hp khng cn b tng lin tc th mch ngng thi cng ct v tng t cch mt di ca dm v bn t 2cm 3cm. Cc sai lch ny c xc nh theo cc phng php o c bng cc thit b v dng c chuyn dng.
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