由于(yu)非開(kai)(kai)挖(wa)(wa)的(de)(de)優勢逐(zhu)漸(jian)被人們認同(tong)，非開(kai)(kai)挖(wa)(wa)技(ji)術日趨成(cheng)熟，非開(kai)(kai)挖(wa)(wa)施(shi)工(gong)(gong)成(cheng)本逐(zhu)年降低，所(suo)以非開(kai)(kai)挖(wa)(wa)的(de)(de)應用在逐(zhu)年增長。頂(ding)(ding)管(guan)(guan)施(shi)工(gong)(gong)突(tu)出的(de)(de)特點就是適(shi)應性(xing)問題。針(zhen)對不同(tong)的(de)(de)地質情況、施(shi)工(gong)(gong)條件和設計要求，選用與(yu)之(zhi)適(shi)應的(de)(de)頂(ding)(ding)管(guan)(guan)施(shi)工(gong)(gong)方(fang)式，如何正(zheng)確地選擇(ze)頂(ding)(ding)管(guan)(guan)機(ji)和配套(tao)輔助設備，對于(yu)頂(ding)(ding)管(guan)(guan)施(shi)工(gong)(gong)來說(shuo)將是非常關鍵的(de)(de)。本頂(ding)(ding)管(guan)(guan)工(gong)(gong)程在頂(ding)(ding)進長度超過(guo)100米時，考(kao)慮在機(ji)頭后設置一(yi)只中繼(ji)間(jian)(jian)，并采用觸(chu)變(bian)泥漿(jiang)注漿(jiang)工(gong)(gong)藝。中繼(ji)間(jian)(jian)由前殼體(ti)、千斤頂(ding)(ding)及后殼體(ti)組(zu)成(cheng)。

非(fei)(fei)開(kai)挖技(ji)術(shu)的(de)特點與其(qi)它(ta)技(ji)術(shu)相(xiang)比，非(fei)(fei)開(kai)挖技(ji)術(shu)起步較晚(wan)。但(dan)是(shi)值得注意的(de)是(shi)在(zai) 近(jin)20多年中，非(fei)(fei)開(kai)挖技(ji)術(shu)無論(lun)在(zai)理論(lun)上，還(huan)是(shi)在(zai)施(shi)(shi)工(gong)工(gong)藝方面，都有了(le)突飛猛進的(de)發展。相(xiang)比鋼頂(ding)管(guan)(guan)，鋼筋(jin)混(hun)凝土(tu)頂(ding)管(guan)(guan)次要(yao)采用柔性接頭，其(qi)更(geng)具靈活性，兩(liang)個(ge)相(xiang)近(jin)管(guan)(guan)道(dao)之(zhi)間存(cun)有一定(ding)角度(du)，因而，在(zai)糾正偏向方面更(geng)靈敏(min)，效果更(geng)好(hao)。此外，由于(yu)兩(liang)管(guan)(guan)道(dao)之(zhi)間存(cun)在(zai)一定(ding)角度(du)，針對這一特征，可以到達曲(qu)線頂(ding)進目的(de)。頂(ding)管(guan)(guan)施(shi)(shi)工(gong)有利于(yu)文明施(shi)(shi)工(gong)。泥(ni)水(shui)均衡法(fa)施(shi)(shi)工(gong)防止了(le)泥(ni)水(shui)橫(heng)溢和稀(xi)泥(ni)亂(luan)堆放的(de)不良現象，確保(bao)自(zi)然(ran)環境不受凈化。安全系數高。頂(ding)管(guan)(guan)辦法(fa)是(shi)全自(zi)動搖控，不需工(gong)人在(zai)管(guan)(guan)道(dao)內任(ren)務。

頂(ding)進計(ji)(ji)(ji)算(suan)頂(ding)進計(ji)(ji)(ji)算(suan)其(qi)一包(bao)括準確計(ji)(ji)(ji)算(suan)頂(ding)進推力(li)，根據(ju)計(ji)(ji)(ji)算(suan)結果選定相(xiang)應的油缸類(lei)型和(he)確定中(zhong)繼間(jian)的分布;其(qi)二是工(gong)(gong)(gong)作(zuo)井(jing)(jing)(jing)設(she)計(ji)(ji)(ji)，根據(ju)計(ji)(ji)(ji)算(suan)得到(dao)的 大(da)頂(ding)力(li)，提出工(gong)(gong)(gong)作(zuo)井(jing)(jing)(jing)的加(jia)固(gu)方案(an)。沉(chen)井(jing)(jing)(jing)，先施(shi)(shi)工(gong)(gong)(gong)井(jing)(jing)(jing)壁，后(hou)先沉(chen)，到(dao)設(she)計(ji)(ji)(ji)標(biao)高(gao)，進行封(feng)底(di)；逆做(zuo)法：先開挖一段深度，后(hou)做(zuo)井(jing)(jing)(jing)壁，再開挖一段深度，后(hou)做(zuo)井(jing)(jing)(jing)壁，非(fei)開挖頂(ding)管施(shi)(shi)工(gong)(gong)(gong)，施(shi)(shi)工(gong)(gong)(gong)到(dao)設(she)計(ji)(ji)(ji)標(biao)高(gao)進行封(feng)底(di)。兩(liang)種(zhong)(zhong)辦法各有優點，也(ye)有工(gong)(gong)(gong)程穿插采(cai)用施(shi)(shi)工(gong)(gong)(gong)辦法。鋼筋混凝土頂(ding)管接(jie)(jie)頭形(xing)式多樣，無(wu)論采(cai)用哪一種(zhong)(zhong)接(jie)(jie)頭方式，均可到(dao)達(da)迅(xun)速銜(xian)接(jie)(jie)的效(xiao)果，普通幾分鐘(zhong)即可完(wan)成(cheng)。此外(wai)，還無(wu)需停止防(fang)腐操作(zuo)，可大(da)大(da)提升(sheng)工(gong)(gong)(gong)作(zuo)效(xiao)率。