寶(雞)天(水)高速公路麥積山隧道
來源:www.chinagufeng.com  作者:技術管理中心  時間:2009-04-29  點擊量:   
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     寶(雞)天(水)高速公路麥積山隧道      

 

寶(雞)天(水)高速公路是連云港至霍爾果斯國道主干線(GZ45)在甘肅境內的重要路段。大坪里隧道是僅次于秦嶺隧道的亞洲公路第二長隧,為一座上、下行分離的四車道高速公路特長隧道,隧道全長12286米,凈寬10.25m,凈高5.0m,設計行車速度80kg/h,為本段高速公路中一項重要控制工程。我公司寶天項目擔負著第七合同段右線出口5808米的施工任務,2005年12月26日開工。

隧道施工重難點:1、獨頭掘進長:全長12286米,分兩個工作面,是目前采用鉆爆發施工獨頭掘進最長的隧道之一;2、埋置深:該隧道位于秦嶺山脈,地形險峻、山高溝深、除洞口地段外,大部分埋置深度在200米以上,最大深埋477米;3、圍巖結構復雜多變:本遂道穿越Ⅱ、Ⅲ、Ⅳ、Ⅴ級圍巖及斷層破碎帶;4、安全風險大:由于獨頭掘進長、埋置深、圍巖差等特點,在施工中有不可預見因素多,安全形勢嚴峻;5、通風排煙難度大:最小通風長度3000m;6、該隧道處在反坡地段,洞內水只有靠強制性排水才能解決。

開工以來,寶天項目部為保證工程進度加強工序銜接,加快工序循環;實行質量動態管理,使施工過程經常處于受控狀態。針對圍巖復雜多變,采用地質雷達和TSP等儀器進行地質超前預報;實現了在特長隧道施工中安全、質量“零”事故記錄。多次受到了業主的通報表彰。2009年3月15日,我公司寶天項目承建的寶天高速公路大坪里特長隧道右線出口,經全體參建員工39個月的艱苦奮戰率先掘進到分界里程。為寶天高速公路的全線按期完成奠定了堅實基礎。

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