度(du)(du)高 橋式管(guan)圓度(du)(du)誤(wu)差在(zai)(zai)2mm以內，垂直度(du)(du)高，便(bian)于(yu)(yu)(yu)下(xia)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing) 便(bian)于(yu)(yu)(yu)安(an)裝，避免下(xia)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)有彎曲 減少(shao)損耗(hao)。 5、公稱直徑：114-630mm（ 114mm 168mm 219mm 273mm 325mm 426mm 630mm等(deng)(deng)） 基(ji)(ji)坑(keng)(keng)(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)(fa)(fa)(fa)主(zhu)要(yao)(yao)有：明溝(gou)加(jia)集(ji)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)井(jing)(jing)(jing)(jing)(jing)(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)井(jing)(jing)(jing)(jing)(jing)(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)(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)(dian)(dian)滲(shen)(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(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)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(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)(deng)等(deng)(deng)。各種(zhong)(zhong)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)(fa)(fa)(fa)有其(qi)特(te)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)和(he)(he)(he)適(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)情(qing)況，比較(jiao)如下(xia)： （一(yi)(yi)(yi)）明溝(gou)加(jia)集(ji)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)井(jing)(jing)(jing)(jing)(jing)(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(gou)加(jia)集(ji)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)井(jing)(jing)(jing)(jing)(jing)(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)(shi)(shi)一(yi)(yi)(yi)種(zhong)(zhong)人工排降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)法(fa)(fa)(fa)(fa)。它具(ju)有施(shi)(shi)工方(fang)便(bian)，用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)具(ju)簡(jian)單(dan)，費用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)低(di)(di)廉的(de)(de)特(te)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)，在(zai)(zai)施(shi)(shi)工現(xian)場(chang)應(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)的(de)(de)***為普遍(bian)。在(zai)(zai)高水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)(wei)地(di)區(qu)基(ji)(ji)坑(keng)(keng)(keng)(keng)邊(bian)坡支(zhi)(zhi)護工程(cheng)(cheng)中(zhong)，這(zhe)(zhe)種(zhong)(zhong)方(fang)法(fa)(fa)(fa)(fa)往(wang)(wang)往(wang)(wang)作為阻(zu)擋(dang)法(fa)(fa)(fa)(fa)或(huo)其(qi)他(ta)(ta)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)(fa)(fa)(fa)的(de)(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(shi)(shi)，它主(zhu)要(yao)(yao)排除地(di)下(xia)潛水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)、施(shi)(shi)工用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)和(he)(he)(he)天(tian)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)地(di)下(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)較(jiao)豐(feng)富(fu)地(di)區(qu)，若僅單(dan)獨采(cai)(cai)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)這(zhe)(zhe)種(zhong)(zhong)方(fang)法(fa)(fa)(fa)(fa)降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)，由于(yu)(yu)(yu)基(ji)(ji)坑(keng)(keng)(keng)(keng)邊(bian)坡滲(shen)(shen)(shen)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)較(jiao)多，錨噴(pen)(pen)網(wang)支(zhi)(zhi)護時使混凝土(tu)噴(pen)(pen)射難(nan)(nan)度(du)(du)加(jia)大(da)(da)(da)（噴(pen)(pen)不(bu)上），有時加(jia)排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)管(guan)也(ye)很(hen)(hen)難(nan)(nan)湊(cou)效(xiao)(xiao)，并(bing)且作業面泥濘不(bu)堪阻(zu)礙(ai)施(shi)(shi)工操作。因此，這(zhe)(zhe)種(zhong)(zhong)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)(fa)(fa)(fa)一(yi)(yi)(yi)般(ban)(ban)(ban)不(bu)單(dan)獨應(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)于(yu)(yu)(yu)高水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)(wei)地(di)區(qu)基(ji)(ji)坑(keng)(keng)(keng)(keng)邊(bian)坡支(zhi)(zhi)護中(zhong)，但(dan)(dan)在(zai)(zai)低(di)(di)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)(wei)地(di)區(qu)或(huo)土(tu)層(ceng)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)很(hen)(hen)小及允(yun)許放坡的(de)(de)工程(cheng)(cheng)中(zhong)可單(dan)獨應(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)。 （二）輕(qing)(qing)型(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(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)井(jing)(jing)(jing)(jing)(jing)(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)輕(qing)(qing)型(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)）是(shi)(shi)(shi)國內應(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)很(hen)(hen)廣的(de)(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)(fa)(fa)(fa)，它比其(qi)他(ta)(ta)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)施(shi)(shi)工簡(jian)單(dan)、、經濟，特(te)別適(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)于(yu)(yu)(yu)基(ji)(ji)坑(keng)(keng)(keng)(keng)面積(ji)不(bu)大(da)(da)(da)，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)(wei)不(bu)深(shen)的(de)(de)場(chang)合(he)。 該方(fang)法(fa)(fa)(fa)(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)(wei)深(shen)度(du)(du)一(yi)(yi)(yi)般(ban)(ban)(ban)在(zai)(zai)3-6m之(zhi)間(jian)，若要(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)度(du)(du)大(da)(da)(da)于(yu)(yu)(yu)6m，理論上可以采(cai)(cai)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)多級(ji)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)，但(dan)(dan)要(yao)(yao)求基(ji)(ji)坑(keng)(keng)(keng)(keng)四周外(wai)需(xu)要(yao)(yao)足夠的(de)(de)空(kong)間(jian)，以便(bian)于(yu)(yu)(yu)放坡或(huo)挖槽，這(zhe)(zhe)對于(yu)(yu)(yu)場(chang)地(di)受限(xian)的(de)(de)基(ji)(ji)坑(keng)(keng)(keng)(keng)支(zhi)(zhi)護工程(cheng)(cheng)一(yi)(yi)(yi)般(ban)(ban)(ban)是(shi)(shi)(shi)不(bu)允(yun)許的(de)(de)，故常用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)的(de)(de)是(shi)(shi)(shi)一(yi)(yi)(yi)級(ji)輕(qing)(qing)型(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(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)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)適(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)的(de)(de)土(tu)層(ceng)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)位(wei)(wei)(wei)0.1-50m/d，當土(tu)層(ceng)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)偏(pian)小時，需(xu)要(yao)(yao)采(cai)(cai)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)在(zai)(zai)井(jing)(jing)(jing)(jing)(jing)(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)(yong)(yong)(yong)(yong)粘(zhan)(zhan)(zhan)土(tu)封填(tian)和(he)(he)(he)保證井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)各連(lian)接部(bu)位(wei)(wei)(wei)的(de)(de)氣密性等(deng)(deng)措施(shi)(shi)，以提高整(zheng)個井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)的(de)(de)真空(kong)度(du)(du)，才能(neng)達(da)到(dao)(dao)良(liang)好的(de)(de)效(xiao)(xiao)果(guo)。 （三）噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(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(neng)在(zai)(zai)井(jing)(jing)(jing)(jing)(jing)(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(yin)柱的(de)(de)真空(kong)度(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)(wei)深(shen)度(du)(du)大(da)(da)(da)，一(yi)(yi)(yi)般(ban)(ban)(ban)在(zai)(zai)8-20m范(fan)圍(wei)。它適(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)的(de)(de)土(tu)層(ceng)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)與輕(qing)(qing)型(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(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)(ban)(ban)為0.1-50m/d。但(dan)(dan)其(qi)抽水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)系(xi)(xi)(xi)統(tong)和(he)(he)(he)噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)管(guan)很(hen)(hen)復(fu)雜(za)，運(yun)行(xing)故障率較(jiao)高，且能(neng)量(liang)(liang)損耗(hao)很(hen)(hen)大(da)(da)(da)，所需(xu)費用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)比其(qi)他(ta)(ta)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)法(fa)(fa)(fa)(fa)要(yao)(yao)高。 （四）電(dian)(dian)(dian)滲(shen)(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(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)(dian)(dian)滲(shen)(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)適(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)于(yu)(yu)(yu)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)很(hen)(hen)小的(de)(de)細顆粒土(tu)，如粘(zhan)(zhan)(zhan)土(tu)、亞粘(zhan)(zhan)(zhan)土(tu)、淤(yu)泥和(he)(he)(he)淤(yu)泥質(zhi)粘(zhan)(zhan)(zhan)土(tu)等(deng)(deng)。這(zhe)(zhe)些土(tu)的(de)(de)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)小于(yu)(yu)(yu)0.1m/d，用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)一(yi)(yi)(yi)般(ban)(ban)(ban)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)很(hen)(hen)難(nan)(nan)達(da)到(dao)(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)(de)。利用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)滲(shen)(shen)(shen)現(xian)象(xiang)能(neng)有效(xiao)(xiao)地(di)把細粒土(tu)中(zhong)的(de)(de)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)抽吸排出(chu)。它需(xu)要(yao)(yao)與輕(qing)(qing)型(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)或(huo)噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)結合(he)應(ying)用(yong)(yong)(yong)(yong)(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)(wei)深(shen)度(du)(du)決(jue)定(ding)于(yu)(yu)(yu)輕(qing)(qing)型(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)或(huo)噴(pen)(pen)射井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)。在(zai)(zai)電(dian)(dian)(dian)滲(shen)(shen)(shen)井(jing)(jing)(jing)(jing)(jing)(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)(cheng)中(zhong)，應(ying)對電(dian)(dian)(dian)壓、電(dian)(dian)(dian)流密度(du)(du)和(he)(he)(he)耗(hao)電(dian)(dian)(dian)量(liang)(liang)等(deng)(deng)進(jin)行(xing)量(liang)(liang)測和(he)(he)(he)必要(yao)(yao)的(de)(de)調整(zheng)，并(bing)做好記錄，因此比較(jiao)繁瑣。 （五）管(guan)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(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)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)適(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)于(yu)(yu)(yu)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)大(da)(da)(da)的(de)(de)砂礫層(ceng)，地(di)下(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)豐(feng)富(fu)的(de)(de)地(di)層(ceng)，以及輕(qing)(qing)型(xing)(xing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)不(bu)易解決(jue)的(de)(de)場(chang)合(he)。每口管(guan)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)出(chu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)流量(liang)(liang)可達(da)到(dao)(dao)50-100m3/h，土(tu)的(de)(de)滲(shen)(shen)(shen)透(tou)系(xi)(xi)(xi)數(shu)(shu)(shu)在(zai)(zai)20-200m/d范(fan)圍(wei)內，降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)低(di)(di)地(di)下(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)(wei)(wei)深(shen)度(du)(du)約3-5m。這(zhe)(zhe)種(zhong)(zhong)方(fang)法(fa)(fa)(fa)(fa)一(yi)(yi)(yi)般(ban)(ban)(ban)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)于(yu)(yu)(yu)潛水(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(liu)）深(shen)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(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)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)井(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)(jing)點(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)(shi)(shi)基(ji)(ji)坑(keng)(keng)(keng)(keng)支(zhi)(zhi)護中(zhong)應(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)較(jiao)多的(de)(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)(fa)(fa)(fa)，它的(de)(de)優點(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)(shi)(shi)排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)量(liang)(liang)大(da)(da)(da)、降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)深(shen)度(du)(du)大(da)(da)(da)、降(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)范(fan)圍(wei)大(da)(da)(da)等(deng)(deng)。