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度(du)(du)(du)(du)高(gao) 橋式管(guan)圓度(du)(du)(du)(du)誤(wu)差在(zai)(zai)(zai)2mm以內(nei)，垂(chui)直(zhi)度(du)(du)(du)(du)高(gao)，便(bian)于(yu)(yu)(yu)下(xia)井(jing)(jing)(jing)(jing)(jing)(jing)(jing) 便(bian)于(yu)(yu)(yu)安裝，避免下(xia)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)有(you)(you)彎曲 減少損耗(hao)。 5、公稱直(zhi)徑：114-630mm（ 114mm 168mm 219mm 273mm 325mm 426mm 630mm等(deng)） 基坑(keng)(keng)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)方(fang)法(fa)主(zhu)(zhu)要(yao)(yao)(yao)有(you)(you)：明溝加集水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)、輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)、噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)、電(dian)滲(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)、深(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)等(deng)等(deng)。各種降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)方(fang)法(fa)有(you)(you)其(qi)特(te)(te)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)和(he)適(shi)(shi)用(yong)(yong)(yong)(yong)情況，比較(jiao)如下(xia)： （一(yi)(yi)(yi)）明溝加集水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui) 明溝加集水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)是(shi)一(yi)(yi)(yi)種人(ren)工(gong)(gong)(gong)(gong)排降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)法(fa)。它具有(you)(you)施工(gong)(gong)(gong)(gong)方(fang)便(bian)，用(yong)(yong)(yong)(yong)具簡單，費用(yong)(yong)(yong)(yong)低(di)(di)廉的(de)特(te)(te)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)，在(zai)(zai)(zai)施工(gong)(gong)(gong)(gong)現場應(ying)(ying)用(yong)(yong)(yong)(yong)的(de)***為(wei)(wei)(wei)普遍(bian)。在(zai)(zai)(zai)高(gao)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)地(di)(di)區(qu)基坑(keng)(keng)邊坡(po)支(zhi)護工(gong)(gong)(gong)(gong)程(cheng)中(zhong)，這種方(fang)法(fa)往往作為(wei)(wei)(wei)阻擋法(fa)或其(qi)他降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)方(fang)法(fa)的(de)輔助排降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)措施，它主(zhu)(zhu)要(yao)(yao)(yao)排除地(di)(di)下(xia)潛(qian)(qian)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)、施工(gong)(gong)(gong)(gong)用(yong)(yong)(yong)(yong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)和(he)天降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)雨水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)。 在(zai)(zai)(zai)地(di)(di)下(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)較(jiao)豐富地(di)(di)區(qu)，若僅單獨(du)采用(yong)(yong)(yong)(yong)這種方(fang)法(fa)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)，由(you)于(yu)(yu)(yu)基坑(keng)(keng)邊坡(po)滲(shen)(shen)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)較(jiao)多(duo)，錨噴(pen)(pen)網支(zhi)護時使混凝土(tu)噴(pen)(pen)射難(nan)度(du)(du)(du)(du)加大（噴(pen)(pen)不(bu)上），有(you)(you)時加排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)管(guan)也(ye)很(hen)(hen)難(nan)湊(cou)效，并且作業面泥(ni)濘不(bu)堪阻礙施工(gong)(gong)(gong)(gong)操作。因此(ci)，這種降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)方(fang)法(fa)一(yi)(yi)(yi)般(ban)不(bu)單獨(du)應(ying)(ying)用(yong)(yong)(yong)(yong)于(yu)(yu)(yu)高(gao)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)地(di)(di)區(qu)基坑(keng)(keng)邊坡(po)支(zhi)護中(zhong)，但(dan)(dan)(dan)在(zai)(zai)(zai)低(di)(di)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)地(di)(di)區(qu)或土(tu)層(ceng)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)很(hen)(hen)小及(ji)允(yun)許(xu)放坡(po)的(de)工(gong)(gong)(gong)(gong)程(cheng)中(zhong)可(ke)單獨(du)應(ying)(ying)用(yong)(yong)(yong)(yong)。 （二）輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui) 輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)（一(yi)(yi)(yi)級(ji)(ji)輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)）是(shi)國(guo)內(nei)應(ying)(ying)用(yong)(yong)(yong)(yong)很(hen)(hen)廣(guang)的(de)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)方(fang)法(fa)，它比其(qi)他井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)施工(gong)(gong)(gong)(gong)簡單、、經濟(ji)，特(te)(te)別適(shi)(shi)用(yong)(yong)(yong)(yong)于(yu)(yu)(yu)基坑(keng)(keng)面積不(bu)大，降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)低(di)(di)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)不(bu)深(shen)(shen)的(de)場合。 該方(fang)法(fa)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)低(di)(di)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)深(shen)(shen)度(du)(du)(du)(du)一(yi)(yi)(yi)般(ban)在(zai)(zai)(zai)3-6m之間，若要(yao)(yao)(yao)求降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)深(shen)(shen)度(du)(du)(du)(du)大于(yu)(yu)(yu)6m，理論上可(ke)以采用(yong)(yong)(yong)(yong)多(duo)級(ji)(ji)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)，但(dan)(dan)(dan)要(yao)(yao)(yao)求基坑(keng)(keng)四(si)周(zhou)外需(xu)(xu)要(yao)(yao)(yao)足夠的(de)空間，以便(bian)于(yu)(yu)(yu)放坡(po)或挖槽，這對于(yu)(yu)(yu)場地(di)(di)受限的(de)基坑(keng)(keng)支(zhi)護工(gong)(gong)(gong)(gong)程(cheng)一(yi)(yi)(yi)般(ban)是(shi)不(bu)允(yun)許(xu)的(de)，故常用(yong)(yong)(yong)(yong)的(de)是(shi)一(yi)(yi)(yi)級(ji)(ji)輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)。輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)適(shi)(shi)用(yong)(yong)(yong)(yong)的(de)土(tu)層(ceng)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)位(wei)(wei)0.1-50m/d，當(dang)土(tu)層(ceng)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)偏小時，需(xu)(xu)要(yao)(yao)(yao)采用(yong)(yong)(yong)(yong)在(zai)(zai)(zai)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)管(guan)頂部(bu)用(yong)(yong)(yong)(yong)粘土(tu)封填和(he)保證井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)各連接部(bu)位(wei)(wei)的(de)氣(qi)密性等(deng)措施，以提高(gao)整(zheng)(zheng)個井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)的(de)真空度(du)(du)(du)(du)，才(cai)能達(da)到(dao)良好的(de)效果。 （三）噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui) 橋式濾水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)管(guan)系(xi)(xi)(xi)統(tong)能在(zai)(zai)(zai)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)底部(bu)產生250mm水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)銀柱的(de)真空度(du)(du)(du)(du)，其(qi)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)低(di)(di)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)深(shen)(shen)度(du)(du)(du)(du)大，一(yi)(yi)(yi)般(ban)在(zai)(zai)(zai)8-20m范圍(wei)。它適(shi)(shi)用(yong)(yong)(yong)(yong)的(de)土(tu)層(ceng)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)與(yu)輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)一(yi)(yi)(yi)樣(yang)，一(yi)(yi)(yi)般(ban)為(wei)(wei)(wei)0.1-50m/d。但(dan)(dan)(dan)其(qi)抽水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)系(xi)(xi)(xi)統(tong)和(he)噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)管(guan)很(hen)(hen)復雜，運行故障(zhang)率較(jiao)高(gao)，且能量損耗(hao)很(hen)(hen)大，所需(xu)(xu)費用(yong)(yong)(yong)(yong)比其(qi)他井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)法(fa)要(yao)(yao)(yao)高(gao)。 （四(si)）電(dian)滲(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui) 電(dian)滲(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)適(shi)(shi)用(yong)(yong)(yong)(yong)于(yu)(yu)(yu)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)很(hen)(hen)小的(de)細(xi)顆(ke)粒土(tu)，如粘土(tu)、亞粘土(tu)、淤泥(ni)和(he)淤泥(ni)質粘土(tu)等(deng)。這些土(tu)的(de)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)小于(yu)(yu)(yu)0.1m/d，用(yong)(yong)(yong)(yong)一(yi)(yi)(yi)般(ban)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)很(hen)(hen)難(nan)達(da)到(dao)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)目的(de)。利用(yong)(yong)(yong)(yong)電(dian)滲(shen)(shen)現象能有(you)(you)效地(di)(di)把(ba)細(xi)粒土(tu)中(zhong)的(de)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)抽吸排出。它需(xu)(xu)要(yao)(yao)(yao)與(yu)輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)或噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)結合應(ying)(ying)用(yong)(yong)(yong)(yong)，其(qi)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)低(di)(di)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)深(shen)(shen)度(du)(du)(du)(du)決定于(yu)(yu)(yu)輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)或噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)。在(zai)(zai)(zai)電(dian)滲(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)過(guo)程(cheng)中(zhong)，應(ying)(ying)對電(dian)壓(ya)、電(dian)流密度(du)(du)(du)(du)和(he)耗(hao)電(dian)量等(deng)進行量測和(he)必要(yao)(yao)(yao)的(de)調整(zheng)(zheng)，并做(zuo)好記錄，因此(ci)比較(jiao)繁(fan)瑣。 （五(wu)）管(guan)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui) 管(guan)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)適(shi)(shi)用(yong)(yong)(yong)(yong)于(yu)(yu)(yu)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)大的(de)砂礫層(ceng)，地(di)(di)下(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)豐富的(de)地(di)(di)層(ceng)，以及(ji)輕(qing)(qing)型(xing)(xing)(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)不(bu)易解決的(de)場合。每口管(guan)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)出水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)流量可(ke)達(da)到(dao)50-100m3/h，土(tu)的(de)滲(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)在(zai)(zai)(zai)20-200m/d范圍(wei)內(nei)，降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)低(di)(di)地(di)(di)下(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)深(shen)(shen)度(du)(du)(du)(du)約3-5m。這種方(fang)法(fa)一(yi)(yi)(yi)般(ban)用(yong)(yong)(yong)(yong)于(yu)(yu)(yu)潛(qian)(qian)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)層(ceng)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)。 （六）深(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui) 深(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)基坑(keng)(keng)支(zhi)護中(zhong)應(ying)(ying)用(yong)(yong)(yong)(yong)較(jiao)多(duo)的(de)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)方(fang)法(fa)，它的(de)優點(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)量大、降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)深(shen)(shen)度(du)(du)(du)(du)大、降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)范圍(wei)大等(deng)。