chuyen de ho dao sau

5/19/2018 Chuyen de Ho Dao Sau

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CHUYEN E THI CONG HO

AO


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Sng th4: Tng quan vcc bin php thicng ho v cc dng sc.

Chiu th4: Cc yu tnh hng n chuynvtrong ho.

Ti th4: Cc v dlin hvi cc bi ton chc t.

:trt tri y ho. Chiu th5, sng th6, chiu th6: Sinh vin

tnghin cu 4 bi ton chc t v vit thuhoch vho su. NP THU HoCH TRC KTHI HC K.


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Mc tiu thi cng ho C ththi cng o t n cao thit

kcui cng. Khng c st l, khng c scln.

uy n v ngang c a t ng n n t. Ln ca t nn l t nht. nh hng n cng trnh ln cn l t

nht


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Cc bin php thi cng

Bin php thi cng o hthng dng. Phng php topdown. . Thi cng ng dng p lc nc.


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Cc kt cu ho cn thit k Tng chn t Kch thc v di,

Thp. BTCT ti ch. BTCT c sn.

Gcc loi. Vng chng, h.

Thp. G. BTCT,


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Bin php o h


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Phng php topdown


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Phng php updown


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Phng php sdng p lc nc


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Cc dng scho c ging n nh trt tng th,

Mt n nh y do trt tri y tri, Xi ngm, ra tri cc ht mn, phun tro, , cng ca tng chn, Chuyn vqu mc ca tng chn,

Ln ca t nn qu mc, Chuyn vngang ca t nn qu mc, Chn ng n cng trnh xung quanh,


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n nh tng th


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y tri y


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t c xu hng nra sau khi o dt pha trn. Nguyn nhn l do p lcthng ng gim. Hin tng ntri ny

khng gy nguy him cho ho. Mt khc, t 2 bn ho tc dng lny hnhl mt gia ti lm cho t di

mt mng btrt sang ph n y h o, hu qul y ho by tri ln.Hin tng ny rt nguy him c bit l

trong iu kin t yu, c thlm mt nnh y h.


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Xi ngm, ra tri cc ht mn


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Hhng vng chng Bin dng 1

vng chngstruynni lc

chng bncnh, cuicng dn

n phhy tonh.


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Khnng chu un ca tng


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Chuyn vngang ca tng khi H khc nhau


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Chiu su ti hn o t theo phn tch ca phn mmsage script


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Chuyn vqu ln ca tng


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Chuyn vqu ln ca tng chn c thgy ra

chuyn vmng ca cc cng trnh ln cn; lnguyn nhn lm nn t bln; lm cho ntmt ng v cc cng trnh ngm bn cnh.


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Hmc nc ngm

Hmc nc ngm lm tng ng sut hiu qutrong t yu, m hu qucui cng l ln ckt.


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Chuyn vt v tng chn ho Vaterland - Oslo


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Cc yu tnh hng nchuyn vtrong ho


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Sc khng ct khng thot nc ca t,Cu, Chiu su ho,H

Chiu rng ho, B su ngm ca tng cdi y

m ng, Chiu su n tng t cng, T cng tng c,EI

Khong cch ca cc vng chng, Tay nghcng nhn


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nh hng do thay i sc khng ct


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Hsan ton Terzaghi


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nh hng ca su ho ln chuyn v

tng chn


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nh hng ca brng ho

n chuyn vtng


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nh hng ca brng ho


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Chiu su n tng t cng, T


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nh hng ca chiu dy t yu T/B


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cng tng c,EI


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Sthay i ca moment un theo cc giai on thi cng


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nh hng ca moment v cng tng c.


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Kh h h


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Khong cch ca cc vng chng,


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h h hi


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nh hng chiu su ngm

ca tng cvo nn t, D


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Khi chiu su ngm n tng t cng


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Khi chiu su ngm n tng t cng.

C larsen


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Clarsen

Tng barrett

Trng hp c larsen D=30M


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g p c a se 30

nh hng ca hnh dng h o B/L


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nh hng ca hnh dng ho B/L


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Tay ngh v kinh nghim thi cng


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Tay nghv kinh nghim thi cng Tay nghca nh thu ng vai tr rt ln trong vic

m bo an ton, cht lng trong qu trnh thi cngtng chn cng nhslm vic ca tng csau

ny. Sau y l mt skhuyt tt thng gp: Thi cng tng chn khng thng hng, nghing so viphng thng ng lm cho vic tip xc gia tng v

.

cc b, lan truyn thnh ph hoi ton h. Mt phng khung ging khng vung gc vi phngthng ng ca tng, pht sinh lc lm cho hgingtrt ra khi vtr thit k.

Sai st do lch tm ca cc thanh hchng , khngcng nm trong mt phng. iu ny dn n vic xuthin cc ni lc lch tm, lm cho lin kt bph hy, t dn n sp ton h.

Cht lng thi cng mi ni khng c quan tm ng


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g g g q gmc. Cc mi ni (buloong, hn) ssi, khng ctnh ton, khng c nghim thu. Nhiu khi quan niml mi ni tm sao cho dtho gsau ny. Kinh nghimsp cu cn thcho thy cng tc qun l cht lngcng tc tm cng phi c coi nhcc cng tc thi

cng chnh: phi c thit k, phi c nghim thu thnghim, vt liu tayngheef cng nhn phi c kimsot.

Vt liu thi cn sdn nhiu ln, bcon vnh, nmn.. d n n khnng chu lc khng nhban u,

tuy nhin khng c n vthi cng, gim st nh ging mc. Khng quan trc hoc khng xl cc sliu quan trc

nhn nh kp thi vsc, t c bin php khc

phc. Khng c hiu bit y vng xca t nn gmt v nc trong t xung quanh tng chn t.

nh hng o trc khi lp ging


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nh hng o trc khi lp ging


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n nh trt tri y ho Terzaghi

(1943) Bjerrum vEide (1956)

Eide vnhm(1972)

Goh (1996)

V d trt tri ca Bjerrum and Eide


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V dtrt tri ca Bjerrum and Eide

Phng php terzaghi (1943)


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Phng php terzaghi (1943)


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Gii hn v phm vi p dng

Cho ho rng v di, Cha xem xt ti chiu su ngm ca tng

Cha xem xt n hnh dng ca ho, Cha xem xt n cng ca tng c,

Phng php Bjerrum v Eide (1956)


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Phng php Bjerrum v Eide (1956)


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Gii hn v phm vi p dng

Cho ho hp, Cha xem xt n chiu su ngm ca tng

,

Cha xem xt n chiu dy ca lp t ntng t cng,

Cha xem xt n cng ca tng c.


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Eide v nhm (1972)


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Cng thc sa i ca Eide v nhm 1972


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Gii hn v phm vi p dng,

Cho ho hp, Cha xem xt n chiu dy ca lp t n

,

Cha xem xt n cng ca tng c.

Phng php ca Goh (1994)


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u khuyt im ca phng php Goh


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Chp dng cho ho di,L>>B Chp dng cho ho rng,B/H>1 Chp dng cho Cu khng i,

Khng bit p dng Cu no nu Cu thay i, xem xt n chiu su ngm ca tng

cvo t, D

xem xt chiu su n tng t yu, T xem xt n cng ca tng c, EI

Cha xem xt n hnh dng ca ho L/B Trng hp tng cng n tng t yuD=T khng r,

Cha xem xt n trt bn trong tng c,

So snh cc phng php


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tin cy ca php tnh hsan ton?


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Sc khng ct khng thot nc (Cu1 & Cu2) Khi lng ring () Ti trng gia ti (qs) v brng gia ca gia ti (Bs)

Hsan ton cho php?


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Sliu thc t

Sliu tphn mm


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Xl y ho chng y tri


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n nh y


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ti clarke(Shirlaw vnhm 2000)

H santon khikhng xlbm va:0.45 0.6

Phng php phn thu hn - Dm trn n-gi ta


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Phng php phn thu hn


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bn khng gian lin tc

Gii hn phn tch li ?


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Hoc?


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Lm thno c kt qutnh ton tt nht?


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Cc th nghim khng thot nc.


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Nhng yu tcha chc chn

h


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vho su.

iu kin a cht,

Ti gia cng


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Ti gia cng, Cc nm trong hmng, Mng ca cc cng trnh ln cn,

Hiu ng 3-D, Trnh tthi cng:

Thi cng tng,

Thi cng vng chng, ng lc tng kch, Phun va,

Mc chm tr, Nng lc, tay ngh,

Quan trc trong thi cng ho su.

Mc tiu


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Mc tiu kim tra, nu ho trong tnh trng nguy himca sc,

kim tra cc tiu ch kthut c m bo haykhng,

kim tra hiu qucc phng n khc phc,,

trnh cc khiu kin khng mong mun. Cc loi quan trc: Bin dng tng

o nghing trn tng,

o nghing trong t, o c trn u c,

Lc trong vng chng:

Kch ti vis


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Kch ti vis, ng hchn ng, ng hnhit,

Ln ca nn t: im trc c, Tm o ln trong t,

uy n v c c c ng r n n c n:

im trc c o chuyn vngang v ng Tm o nghing, Thc o vt nt,

Mc nc ngm: ng thm mc nc ngm,

Khc:o moment un ca tng,p lc nc lrng,trt tri, chuyn v- chn ng cng trnh hm.


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Tn sut quan trc

Cn kim tra ton b cng trnh ln cn trc


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Cn kim tra ton bcng trnh ln cn trckhi khi cng cng trnh, Cc vt nt trn tng, mi n, hthng cp thot

nc, va h. nghing ca tng, ct ln tng v ln lch,

Khi c th, o 3 ln cho tt cyu t.

Trong qu trnh o t v xy dng tng hm,tn sut quan trc phthuc vo kch cdn,iu kin a cht v snhy cm ca cc cng

trnh ln cn. Nhiu quan trc c thc hin 1-2 ln 1 tun.

Quan trc thm ngay sau khi o t xong

tng giai on v sau khi tng ti vngchng v tho d vng chng


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tng giai on, v sau khi tng ti vngchng v tho dvng chng. Sau khi thi cng phn ngm, tip tc quan

trc t nht l 6 thng hoc cho n khicc gi trquan trc bt u n nh.

cc gi tr. Trong nhiu trng hp gitro 2

phng A,B c thc sdng o

bin dng ca tng c.

Bin dng ca tng theo cc giai on o t


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Tc thay i chuyn vkhi o


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ti thu hoch


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Anh chnhn thc c g vho sutrong iu kin t yu qua chuyn vaqua. Vn dng cc kin thc hc v

qua bo ch.) xy dng cho mnh ccnguyn tc khi tnh ton v thi cng ho su.

TI LP TCXD-06


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Anh chthu thp cc ti liu quan trc mtvi cng trnh thi cng ho su c schoc khng c scphn tch v

ca chuyn . Qua anh,chc kt cho mnh mt vikt lun khi thi cng ho su.

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