06/01/2014 SN NH MI IU CN BIT KHI XY DNG NH (P.3)

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SN NH MI IU CN BIT KHI XY DNG NH(P.3)

SN SNG PHC V QU KHCH

Sn nh b tng ct thp (p.3):

Thng thng vng gia sn nh b tng ct thp th pha di chu ko, ph trn chu nn, vngxung quanh sn th ngc li. Ct thp trong sn vn b tr theo nguyn tc l t ct thp chu lc vng chu ko (un) v khng c nhm ln. Dng ct thp = 6 8.

i vi bn sn dm, ct thp chu lc t pha di, theo chiu ngn ca sn, dt cch nhau 70 150mm ( vng gia sn t dy hn).

Ti vng sn st tng thng c m-men m nn cn b 2/3 s thanh chu lc ( cch 1 b 2) mt onl/10 vi b =30 (l l khon cch gia hai gi ta) ln pha trn tip nhn ng sut ko do m=menm gy ra. Cc thanh cn li pha di sn (khng b ln) phi cn > 3 thanh trn 1m di. Ct thp phnb l 6, t vung gc vi ct thp chu lc, cch nhau 350mm nhng khng c < 3 thanh trn 1mdi.

06/01/2014 SN NH MI IU CN BIT KHI XY DNG NH (P.3)

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Sn nh b tng ct thp

Khi sn nh nh ra ngoi gi ta (tng) l mi ua, ban cng, th phn nh ra l bn cng-xon nhtthit phi t ct thp pha trn sn nh. Khi phn nh ra khng ln lm ( 400m) che cho pha di,lm s-n,.. th c h thp phn sn nh ra. Tu theo s lng gi ta ngi ta phn bn tng thnhbn cng-xon, bn mt nhp, bn nhiu nhp. i vi bn nhiu hn 2 nhp, ct thp chu lc t pha di,dng 6-8 dt nh bn dm. Ti vng sn st tng v trn cc gi ta un ct thp pha trn nh bndm. Mt ct thp pha di cn c neo chc vo gi ta, c bit l gi bin t do.

i vi sn nh chu c dm lin kt bn bn th cc sn nhp gia v gi gia c php gim bt ctthp n 20%. i vi cc sn nhp bin v gi th 2, nu ch c dm ba bn th khng c gim btct thp.

Nu sn nh c l hng m mp l hng khng c dm th phi t ct thp chu lc nh dm chm trongsn nh. u giao nhau hai phn vung gc quanh l hng v vng sn gm cn thm ct thpchng ng sut cc b.