上跨高铁隧道水利隧洞内人工挖孔桩施工初支托换补强关键技术

Key techniques for initial support and reinforcement of artificial excavated piles in hydraulic tunnel

为了解决某水利隧道洞内桩基施工安全风险高的难题,文章提出在人工挖孔桩施工之前,在孔口及附近初支内侧安装临时套拱、斜撑及托架等的方式进行加强支护,最终取得了良好的施工效果。

In order to solve the problem of high safety risk of pile foundation construction in a water conservancy tunnel,the article proposes to install temporary sleeve arches,diagonal braces and brackets to strengthen the support before the manual excavation pile construction,and finally achieved a good construction effect.