文章(zhang)來源：中國葛(ge)洲(zhou)壩集團(tuan)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(zhu)海橫(heng)琴新區(qu)市政基礎設施BT項(xiang)目(mu)隧(sui)道工(gong)(gong)(gong)程是橫(heng)琴市政BT項(xiang)目(mu)的(de)(de)工(gong)(gong)(gong)期(qi)控(kong)制性項(xiang)目(mu)。該(gai)隧(sui)道埋深淺、跨(kua)度大、地質(zhi)條件復雜(za)，受(shou)雨季地表水影響大，設計采(cai)用雙跨(kua)連拱隧(sui)道。自3月開(kai)工(gong)(gong)(gong)以(yi)來，葛洲壩(ba)項(xiang)目(mu)部采(cai)用先(xian)開(kai)挖中(zhong)導(dao)洞(dong)，待(dai)中(zhong)導(dao)洞(dong)貫(guan)通后再進(jin)(jin)行中(zhong)隔墻(qiang)混凝土施工(gong)(gong)(gong)，然(ran)后進(jin)(jin)行左右(you)洞(dong)開(kai)挖支護的(de)(de)施工(gong)(gong)(gong)方(fang)法(fa)，對中(zhong)導(dao)洞(dong)施工(gong)(gong)(gong)采(cai)用全斷面掘進(jin)(jin)、支護的(de)(de)施工(gong)(gong)(gong)，每一循環(huan)進(jin)(jin)尺控(kong)制在1.5-2米左右(you)，嚴格遵守“短進(jin)(jin)尺、弱爆破、強支護、早閉合”的(de)(de)原則，嚴格監控(kong)量測。施工(gong)(gong)(gong)五個(ge)多(duo)月來，質(zhi)量安(an)全環(huan)保指標受(shou)控(kong)，受(shou)到了業主及監理的(de)(de)好評，并提前22天(tian)實現(xian)中(zhong)導(dao)洞(dong)貫(guan)通的(de)(de)階段性目(mu)標。