短小隧道出洞施工中用双层小导管超前支护的施工实践

Application of Double-layer Small Pipe as Pre-Support in the Construction of Short Tunnel Exit

介绍新建某某客运专线沈家岭2号短小隧道利用双层小导管作为超前支护直接出洞,代替大管棚由出口反向进洞的施工技术,取得良好的经济效益。施工经验可供同类工程参考。

This paper introduces the technique of replacing the using big pipe shed to enter a tunnel reversely from the exit with the using of double-layer small pipes as pre-support to exit the tunnel directly in No.2 short tunnel of Shenjialing section of some newly-built passenger line, which brings good economic benefits. This construction experience can be referenced by similar projects.