無論是(shi)各行業部(bu)門規劃不到位，協調不好(hao)，還是(shi)基建(jian)發展需要，新(xin)的地(di)下設施(shi)總(zong)在不斷(duan)增(zeng)加，這時要么開挖，要么非(fei)開挖，必(bi)然選擇其(qi)一。采用(yong)4臺(tai)200噸/臺(tai)千(qian)(qian)(qian)斤(jin)頂(ding)作為主(zhu)頂(ding)，千(qian)(qian)(qian)斤(jin)頂(ding)行程為1.4米。千(qian)(qian)(qian)斤(jin)頂(ding)動力由油泵提供。千(qian)(qian)(qian)斤(jin)頂(ding)后端用(yong)道木和(he)分(fen)壓(ya)環將(jiang)反力均勻作用(yong)于工(gong)作井，前端頂(ding)進(jin)分(fen)壓(ya)環，頂(ding)鐵(tie)將(jiang)頂(ding)力傳至管(guan)節。非(fei)開挖工(gong)程技術(shu)解(jie)決了管(guan)道埋設施(shi)工(gong)中(zhong)對城市(shi)建(jian)筑物的破壞和(he)道路(lu)交通的堵塞等難題，在穩定土層和(he)環境保護方面凸(tu)顯其(qi)優勢。

一節管(guan)子(zi)完(wan)成頂入土(tu)層之(zhi)后，再(zai)下第(di)二節管(guan)子(zi)繼續頂進。其原理是借助于主(zhu)頂油缸及管(guan)道(dao)間、中(zhong)(zhong)繼間等推力(li)，把工(gong)具(ju)管(guan)或(huo)(huo)掘進機(ji)(ji)從工(gong)作坑(keng)內穿過土(tu)層一直推進到(dao)接收坑(keng)內吊起。管(guan)道(dao)緊隨工(gong)具(ju)管(guan)或(huo)(huo)掘進機(ji)(ji)后，埋設在兩坑(keng)之(zhi)間。分(fen)壓(ya)環(huan)(huan)制作具(ju)有(you)足夠的剛性，與管(guan)端面接觸相對平(ping)整，無(wu)變(bian)形。在長距(ju)(ju)離(li)頂進過程中(zhong)(zhong)，當頂進阻(zu)力(li)超(chao)過容許(xu)總頂力(li)時(shi)，無(wu)法一次達(da)到(dao)頂進距(ju)(ju)離(li)時(shi)，須設置中(zhong)(zhong)繼間分(fen)段接力(li)頂進。這種技術的優點是：不(bu)開(kai)挖地面；不(bu)拆，不(bu)破壞地面建(jian)筑物(wu)；不(bu)破壞環(huan)(huan)境；不(bu)影響管(guan)道(dao)的段差變(bian)形；省(sheng)時(shi)、、安全，綜(zong)合(he)造(zao)價(jia)低。

非開(kai)挖技術在國外(wai)已廣(guang)泛使用，在國內也逐漸普及。不開(kai)挖地(di)面(mian)就能穿越(yue)公路(lu)(lu)、鐵路(lu)(lu)、河流，甚至能在建筑物底下穿過，非開(kai)挖管道工(gong)(gong)程(cheng)有限公司，是(shi)一種(zhong)能安全有效地(di)進(jin)行環境保護的施(shi)工(gong)(gong)方(fang)法。頂管施(shi)工(gong)(gong)降(jiang)(jiang)低工(gong)(gong)程(cheng)總造價。可浪費少(shao)量土方(fang)工(gong)(gong)程(cheng)、溝管基座資料，增(zeng)加基坑(keng)支護作業的工(gong)(gong)程(cheng)量，增(zeng)加開(kai)挖、回填(tian)和路(lu)(lu)面(mian)修復。頂管施(shi)工(gong)(gong)降(jiang)(jiang)低交通(tong)壓(ya)力。對城(cheng)市交通(tong)攪擾小，施(shi)工(gong)(gong)面(mian)由線縮成點，占地(di)面(mian)積小，且不會(hui)招(zhao)致(zhi)路(lu)(lu)面(mian)沉降(jiang)(jiang)以致(zhi)發生(sheng)裂紋，防止了路(lu)(lu)面(mian)重修。