頂(ding)管(guan)(guan)直徑(jing)DN800—4500。通過(guo)工(gong)(gong)作井(jing)把要(yao)頂(ding)進(jin)的(de)管(guan)(guan)子頂(ding)入接收(shou)井(jing)內，一(yi)個(ge)工(gong)(gong)作井(jing)內的(de)管(guan)(guan)子可(ke)在(zai)(zai)地下穿(chuan)行(xing)1500米以(yi)上，并且還能曲(qu)線穿(chuan)行(xing)，以(yi)繞(rao)開(kai)一(yi)些地下管(guan)(guan)線或障礙(ai)物。頂(ding)管(guan)(guan)施(shi)工(gong)(gong)就(jiu)是(shi)(shi)非開(kai)挖(wa)(wa)施(shi)工(gong)(gong)方(fang)法，是(shi)(shi)一(yi)種(zhong)不開(kai)挖(wa)(wa)或者少(shao)開(kai)挖(wa)(wa)的(de)管(guan)(guan)道(dao)埋設(she)施(shi)工(gong)(gong)技術。頂(ding)管(guan)(guan)法施(shi)工(gong)(gong)就(jiu)是(shi)(shi)在(zai)(zai)工(gong)(gong)作坑內借助于頂(ding)進(jin)設(she)備產生的(de)頂(ding)力，克服管(guan)(guan)道(dao)與周圍土壤的(de)摩擦力，將管(guan)(guan)道(dao)按設(she)計的(de)坡度頂(ding)入土中，并將土方(fang)運走。頂(ding)管(guan)(guan)施(shi)工(gong)(gong)是(shi)(shi)繼盾構(gou)施(shi)工(gong)(gong)之(zhi)后(hou)而(er)發展起(qi)來的(de)一(yi)種(zhong)地下管(guan)(guan)道(dao)施(shi)工(gong)(gong)方(fang)法，它不需要(yao)開(kai)挖(wa)(wa)面層，并且能夠穿(chuan)越公路、鐵道(dao)、河(he)川(chuan)、地面建(jian)筑物、地下構(gou)筑物以(yi)及(ji)各種(zhong)地下管(guan)(guan)線等。

一節管(guan)(guan)(guan)(guan)子完成(cheng)頂入土層(ceng)之后，再下第二節管(guan)(guan)(guan)(guan)子繼(ji)續(xu)頂進(jin)(jin)。其原理是借助于主頂油缸(gang)及管(guan)(guan)(guan)(guan)道間、中(zhong)繼(ji)間等(deng)推力，把工(gong)具(ju)管(guan)(guan)(guan)(guan)或(huo)掘(jue)進(jin)(jin)機(ji)從工(gong)作(zuo)坑(keng)內穿(chuan)過(guo)(guo)土層(ceng)一直推進(jin)(jin)到(dao)接(jie)收坑(keng)內吊起。管(guan)(guan)(guan)(guan)道緊(jin)隨工(gong)具(ju)管(guan)(guan)(guan)(guan)或(huo)掘(jue)進(jin)(jin)機(ji)后，埋設(she)在兩(liang)坑(keng)之間。分(fen)壓環制作(zuo)具(ju)有足夠的剛性，與管(guan)(guan)(guan)(guan)端面(mian)接(jie)觸相對平整，無變(bian)形。在長距離頂進(jin)(jin)過(guo)(guo)程中(zhong)，當頂進(jin)(jin)阻(zu)力超過(guo)(guo)容許總頂力時(shi)，無法一次達到(dao)頂進(jin)(jin)距離時(shi)，須設(she)置中(zhong)繼(ji)間分(fen)段接(jie)力頂進(jin)(jin)。這種技術的優點是：不(bu)(bu)開挖地(di)面(mian)；不(bu)(bu)拆，不(bu)(bu)破壞(huai)地(di)面(mian)建筑物；不(bu)(bu)破壞(huai)環境；不(bu)(bu)影響管(guan)(guan)(guan)(guan)道的段差(cha)變(bian)形；省時(shi)、、安(an)全，綜合造價(jia)低(di)。

無論是(shi)任務井，亦或(huo)是(shi)接納井，均需(xu)(xu)采用(yong)2次澆筑(zhu)(zhu)成型的(de)施(shi)工方案，當次混凝土(tu)澆筑(zhu)(zhu)強度到達設計(ji)要求(qiu)，才干(gan)停止(zhi)上(shang)部混凝土(tu)井壁的(de)澆筑(zhu)(zhu)，但必需(xu)(xu)保證延(yan)續澆筑(zhu)(zhu)，不允許(xu)存在施(shi)工縫狀況(kuang)。頂(ding)(ding)管(guan)(guan)(guan)機通常用(yong)于小直(zhi)徑(jing)斷面巖石和(he)土(tu)體(ti)(ti)掘進(jin)，其中心就是(shi)將(jiang)一(yi)些(xie)本來集(ji)成在盾構機外(wai)部的(de)功用(yong)部件拿(na)出來，以減(jian)少其尺寸，頂(ding)(ding)推(tui)安裝(zhuang)在任務井里(li)。有(you)毒體(ti)(ti)的(de)檢測(ce)與防(fang)護頂(ding)(ding)管(guan)(guan)(guan)施(shi)工的(de)地層一(yi)般會(hui)通過(guo)淤泥層，腐爛動(dong)、植物體(ti)(ti)會(hui)在地下形(xing)成有(you)毒體(ti)(ti)聚集(ji)體(ti)(ti)，危害施(shi)工人(ren)員的(de)健康(kang)和(he)生命(ming)，地下管(guan)(guan)(guan)道非開挖施(shi)工，所以有(you)人(ren)員在頂(ding)(ding)管(guan)(guan)(guan)內(nei)操作的(de)情況(kuang)下，需(xu)(xu)要定時監測(ce)管(guan)(guan)(guan)內(nei)有(you)毒體(ti)(ti)含量，采用(yong)通風裝(zhuang)置(zhi)予以解決。