正(zheng)常下沉(chen)(chen)(chen)(chen)時，應(ying)(ying)自中(zhong)(zhong)間向刃腳(jiao)處均勻對稱除土。排水(shui)(shui)(shui)除土下沉(chen)(chen)(chen)(chen)的(de)(de)沉(chen)(chen)(chen)(chen)井(jing)(jing)底節(jie)，其設計支承位(wei)置的(de)(de)土，應(ying)(ying)在分層除土中(zhong)(zhong)同時挖(wa)除。由多個井(jing)(jing)室組成的(de)(de)沉(chen)(chen)(chen)(chen)井(jing)(jing)，應(ying)(ying)控制各井(jing)(jing)室之間除土面的(de)(de)高(gao)(gao)差，并(bing)避免(mian)內(nei)隔墻(qiang)底部下沉(chen)(chen)(chen)(chen)時受阻。沉(chen)(chen)(chen)(chen)井(jing)(jing)接(jie)高(gao)(gao)前(qian)應(ying)(ying)盡量糾正(zheng)前(qian)一節(jie)的(de)(de)傾斜，接(jie)高(gao)(gao)一節(jie)的(de)(de)豎向中(zhong)(zhong)軸線應(ying)(ying)與前(qian)一節(jie)的(de)(de)豎向中(zhong)(zhong)軸線重(zhong)合。水(shui)(shui)(shui)上沉(chen)(chen)(chen)(chen)井(jing)(jing)接(jie)高(gao)(gao)時，井(jing)(jing)頂露(lu)出水(shui)(shui)(shui)面不應(ying)(ying)小(xiao)于(yu)1．5m。地面上沉(chen)(chen)(chen)(chen)井(jing)(jing)接(jie)高(gao)(gao)時，井(jing)(jing)頂露(lu)出地面不應(ying)(ying)小(xiao)于(yu)o．5m。接(jie)高(gao)(gao)前(qian)不得掏空刃腳(jiao)，避免(mian)沉(chen)(chen)(chen)(chen)井(jing)(jing)傾斜。沉(chen)(chen)(chen)(chen)井(jing)(jing)基礎施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)一般可(ke)分為早地施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)、水(shui)(shui)(shui)中(zhong)(zhong)筑島及浮運沉(chen)(chen)(chen)(chen)井(jing)(jing)三種(zhong)。施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)前(qian)應(ying)(ying)詳(xiang)細了解場地的(de)(de)地質(zhi)和水(shui)(shui)(shui)文條件。水(shui)(shui)(shui)中(zhong)(zhong)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)應(ying)(ying)做好(hao)河(he)流汛期(qi)、河(he)床沖(chong)刷、通航(hang)及漂流物等調(diao)查研究，充分利用枯(ku)水(shui)(shui)(shui)季(ji)節(jie)，制訂詳(xiang)細的(de)(de)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)計劃及必要的(de)(de)措施(shi)(shi)(shi)(shi)，確(que)保施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)安全。

沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)應(ying)用(yong)(yong)范(fan)圍：埋(mai)置(zhi)較深的構筑(zhu)物(wu)(wu)采(cai)用(yong)(yong)沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)法(fa)施(shi)工(gong)，從經濟和技術角度(du)來(lai)看，也比其(qi)他施(shi)工(gong)方(fang)法(fa)更為合理。給水(shui)(shui)排水(shui)(shui)工(gong)程的地(di)下(xia)構筑(zhu)物(wu)(wu)，沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)施(shi)工(gong)工(gong)藝，多采(cai)用(yong)(yong)沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)。如江心及(ji)岸邊(bian)的取水(shui)(shui)構筑(zhu)物(wu)(wu)、城(cheng)市(shi)雨污(wu)水(shui)(shui)泵(beng)站下(xia)部結構等。沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)下(xia)沉(chen)(chen)(chen)(chen)(chen)(chen)至(zhi)設(she)計標(biao)高后，在(zai)封(feng)底(di)之前應(ying)檢(jian)驗基(ji)底(di)的地(di)質情(qing)況是(shi)否與設(she)計相符(fu)。基(ji)底(di)面(mian)應(ying)整平(ping)、無浮泥和殘留(liu)物(wu)(wu)。清理干凈(jing)的基(ji)底(di)有效(xiao)面(mian)積不(bu)得小(xiao)于(yu)設(she)計要求。應(ying)隨時(shi)保(bao)持沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)正(zheng)位豎直下(xia)沉(chen)(chen)(chen)(chen)(chen)(chen)，每下(xia)沉(chen)(chen)(chen)(chen)(chen)(chen)1m至(zhi)少檢(jian)查一次。沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)人土深度(du)小(xiao)于(yu)沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)平(ping)面(mian)小(xiao)尺寸的1．5～2．0倍時(shi)，出現傾斜，沉(chen)(chen)(chen)(chen)(chen)(chen)井(jing)排水(shui)(shui)施(shi)工(gong)方(fang)案(an)，應(ying)密切注意校正(zheng)糾(jiu)偏。

當出現因(yin)沉(chen)(chen)井自身重(zhong)力(li)偏輕(qing)下(xia)沉(chen)(chen)困難(nan)時，亳州(zhou)沉(chen)(chen)井施工(gong)，可采(cai)用井外高壓(ya)射水(shui)(shui)、降(jiang)低井內(nei)水(shui)(shui)位等方法(fa)下(xia)沉(chen)(chen)。在結構受力(li)允(yun)許的條件下(xia)，也(ye)可以采(cai)用壓(ya)重(zhong)或接高沉(chen)(chen)井下(xia)沉(chen)(chen)。沉(chen)(chen)井下(xia)沉(chen)(chen)施工(gong)有(you)排(pai)(pai)水(shui)(shui)除土(tu)和不排(pai)(pai)水(shui)(shui)除土(tu)兩種方法(fa)。通(tong)常采(cai)用不排(pai)(pai)水(shui)(shui)除土(tu)的方法(fa)。采(cai)用排(pai)(pai)水(shui)(shui)除土(tu)下(xia)沉(chen)(chen)的方法(fa)要有(you)安全措施，防止發生人身安全事(shi)故。沉(chen)(chen)井應(ying)用范(fan)圍：如(ru)因(yin)場地狹窄，同時受附近建筑物或其他因(yin)素(su)條件的限(xian)制，而不適(shi)宜采(cai)用大開(kai)挖(wa)的地點，可采(cai)用沉(chen)(chen)井法(fa)施工(gong)。