大慶降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)工(gong)(gong)程(cheng)是指在地下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)較高(gao)的地區(qu)開挖(wa)(wa)深(shen)基(ji)(ji)坑(keng)，由于(yu)(yu)含水(shui)(shui)(shui)(shui)(shui)(shui)(shui)層被切斷，在壓差(cha)(cha)作(zuo)(zuo)用(yong)(yong)(yong)(yong)(yong)下(xia)(xia)(xia)，地下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)必然會不斷地滲(shen)流(liu)入基(ji)(ji)坑(keng)，如不進行(xing)基(ji)(ji)坑(keng)降排(pai)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)工(gong)(gong)作(zuo)(zuo)，將會造成基(ji)(ji)坑(keng)浸水(shui)(shui)(shui)(shui)(shui)(shui)(shui)，使現場施工(gong)(gong)條件(jian)變差(cha)(cha)，地基(ji)(ji)承載力(li)下(xia)(xia)(xia)降，在動水(shui)(shui)(shui)(shui)(shui)(shui)(shui)壓力(li)作(zuo)(zuo)用(yong)(yong)(yong)(yong)(yong)下(xia)(xia)(xia)還可能(neng)引(yin)(yin)起流(liu)砂(sha)、管(guan)涌(yong)和(he)邊(bian)坡失穩等現象，因此，為確保基(ji)(ji)坑(keng)施工(gong)(gong)安全(quan)，必須采取有(you)效的降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)和(he)排(pai)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)措施，亦(yi)稱降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)工(gong)(gong)程(cheng)。常見(jian)做法(fa)輕型(xing)(xing)井(jing)(jing)(jing)點(dian)(dian)(dian)(dian)（多(duo)級輕型(xing)(xing)井(jing)(jing)(jing)點(dian)(dian)(dian)(dian)）：適用(yong)(yong)(yong)(yong)(yong)于(yu)(yu)巖(yan)(yan)(yan)土(tu)(tu)滲(shen)透(tou)系(xi)數為10**(-2)～10**（-5）cm/s；可能(neng)降低的水(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)深(shen)度(du)：輕型(xing)(xing)井(jing)(jing)(jing)點(dian)(dian)(dian)(dian)為3～6m、多(duo)級輕型(xing)(xing)井(jing)(jing)(jing)點(dian)(dian)(dian)(dian)為6～12m。噴射(she)井(jing)(jing)(jing)點(dian)(dian)(dian)(dian)：適用(yong)(yong)(yong)(yong)(yong)于(yu)(yu)巖(yan)(yan)(yan)土(tu)(tu)滲(shen)透(tou)系(xi)數為10**(-3)～10**（-6）cm/s；可能(neng)降低的水(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)深(shen)度(du)8～20m。電滲(shen)井(jing)(jing)(jing)點(dian)(dian)(dian)(dian)：適用(yong)(yong)(yong)(yong)(yong)于(yu)(yu)巖(yan)(yan)(yan)土(tu)(tu)滲(shen)透(tou)系(xi)數為<10**(-6)cm>10m。井(jing)(jing)(jing)點(dian)(dian)(dian)(dian)降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)費用(yong)(yong)(yong)(yong)(yong)：1、鑿(zao)井(jing)(jing)(jing)費用(yong)(yong)(yong)(yong)(yong)2、設備(bei)安裝3、降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)費用(yong)(yong)(yong)(yong)(yong)（抽(chou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)）降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)分兩(liang)個(ge)階段(duan)進行(xing)：1、成井(jing)(jing)(jing)：多(duo)遠一(yi)個(ge)，深(shen)多(duo)少。鉆孔(kong)、下(xia)(xia)(xia)管(guan)、下(xia)(xia)(xia)料(liao)2、安裝排(pai)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)設備(bei)，以排(pai)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)效果一(yi)井(jing)(jing)(jing)一(yi)泵(beng)(beng)(beng)一(yi)出口管(guan)，周邊(bian)設排(pai)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)池(chi)根據涌(yong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)量確定泵(beng)(beng)(beng)的直(zhi)徑。真空泵(beng)(beng)(beng)降水(shui)(shui)(shui)(shui)(shui)(shui)(shui)所(suo)有(you)井(jing)(jing)(jing)密閉(bi)，用(yong)(yong)(yong)(yong)(yong)總管(guan)連接，用(yong)(yong)(yong)(yong)(yong)泵(beng)(beng)(beng)抽(chou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)，排(pai)至市(shi)政管(guan)網(wang)。明溝(gou)排(pai)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)費用(yong)(yong)(yong)(yong)(yong)：挖(wa)(wa)溝(gou)+引(yin)(yin)流(liu)+水(shui)(shui)(shui)(shui)(shui)(shui)(shui)泵(beng)(beng)(beng)抽(chou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)