文章來源：中國(guo)葛洲壩(ba)集團公司 發布時間：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(hai)橫(heng)琴新區市政基礎(chu)設(she)施BT項(xiang)目隧(sui)道工(gong)(gong)(gong)程是橫(heng)琴市政BT項(xiang)目的(de)工(gong)(gong)(gong)期(qi)控(kong)制(zhi)性項(xiang)目。該隧(sui)道埋(mai)深淺、跨(kua)度大、地質(zhi)(zhi)條件復雜，受雨季地表水(shui)影響大，設(she)計(ji)采用雙跨(kua)連拱隧(sui)道。自3月(yue)開(kai)工(gong)(gong)(gong)以來，葛洲(zhou)壩(ba)項(xiang)目部采用先開(kai)挖中(zhong)導洞(dong)，待中(zhong)導洞(dong)貫通(tong)后再進行(xing)中(zhong)隔墻混凝土施工(gong)(gong)(gong)，然(ran)后進行(xing)左右洞(dong)開(kai)挖支護(hu)的(de)施工(gong)(gong)(gong)方(fang)法，對中(zhong)導洞(dong)施工(gong)(gong)(gong)采用全斷面掘進、支護(hu)的(de)施工(gong)(gong)(gong)，每一循環進尺(chi)(chi)控(kong)制(zhi)在1.5-2米左右，嚴格遵守“短進尺(chi)(chi)、弱爆破、強(qiang)支護(hu)、早(zao)閉合(he)”的(de)原則，嚴格監(jian)控(kong)量測。施工(gong)(gong)(gong)五(wu)個多(duo)月(yue)來，質(zhi)(zhi)量安全環保指標受控(kong)，受到了業主及(ji)監(jian)理(li)的(de)好評，并(bing)提前22天實現(xian)中(zhong)導洞(dong)貫通(tong)的(de)階段性目標。