文章來源(yuan)：中國葛(ge)洲壩集(ji)團公司 發(fa)布時間：2012-09-14
由葛洲壩集團二公司承建的珠海市橫琴新區市政基礎設施項目——環島西路南段SD-1號隧道中導洞近日全線貫通。
珠海橫(heng)琴新區市(shi)政基礎(chu)設施BT項目隧(sui)道(dao)工(gong)(gong)(gong)程是橫(heng)琴市(shi)政BT項目的工(gong)(gong)(gong)期控(kong)(kong)制(zhi)性項目。該隧(sui)道(dao)埋深淺、跨度大、地(di)質條件復雜，受(shou)雨季地(di)表水影響大，設計采(cai)用(yong)(yong)雙跨連(lian)拱隧(sui)道(dao)。自3月開工(gong)(gong)(gong)以(yi)來，葛洲壩項目部采(cai)用(yong)(yong)先開挖中導(dao)洞，待中導(dao)洞貫(guan)通(tong)(tong)后再進行中隔墻混凝土施工(gong)(gong)(gong)，然后進行左(zuo)右洞開挖支(zhi)護(hu)的施工(gong)(gong)(gong)方法，對(dui)中導(dao)洞施工(gong)(gong)(gong)采(cai)用(yong)(yong)全(quan)斷(duan)面掘(jue)進、支(zhi)護(hu)的施工(gong)(gong)(gong)，每(mei)一循環進尺控(kong)(kong)制(zhi)在1.5-2米左(zuo)右，嚴格遵守(shou)“短(duan)進尺、弱爆破、強支(zhi)護(hu)、早(zao)閉合”的原則，嚴格監控(kong)(kong)量測。施工(gong)(gong)(gong)五個(ge)多月來，質量安全(quan)環保指(zhi)標受(shou)控(kong)(kong)，受(shou)到了業(ye)主及監理的好評，并(bing)提前(qian)22天實現中導(dao)洞貫(guan)通(tong)(tong)的階段性目標。