山区高速公路群桩爆破施工

Blasting Construction of Covey Pile on Montanic Freeway

野三河特大桥主桥横跨野三河"V"形峡谷,为(106+200+106 m)的大跨径刚构,其主3#、4#墩为左、右半桥分离的大长宽比薄壁墩,分别位于东西两岸的悬崖陡壁上,施工条件异常艰难。3#、4#墩群桩基础施工时,存在高处和低处同时作业的重叠情况,相互间影响很大,特别是安全方面不能得到保证,为解决这一问题,介绍山区高速公路群桩爆破及施工工艺。

Yesanhe oversize bridge, is （106 ＋ 200 ＋ 106 m）big span rigid frame and crosses the ＂V＂ canyon of Yesanhe, the 3# ,4# pier are thin wall piers with big proportion between length and breadth and locate the cliff gradient of east and west bank, construct condition was exeeptional hardship. The paper introduced construction technics of covey pile on montanic freeway.