岩溶地质斜拉桥索塔钻孔灌注桩施工技术

Construction Technology for Bored Piles of Cable-stayed Bridge Tower in Karst Area

杨梅洲大桥22~#索塔位于水陆交界处且溶洞地质发育,论述在复杂环境下钻孔灌注桩的成桩要点,以保证桩基施工安全、经济、高效。主要研究内容包括搭设锁口钢管桩围堰施工平台,优化围堰内群桩施工顺序以及在溶洞发育条件下改善钻孔成桩技术。研究成果对类似工程施工具有重要的参考借鉴意义。

The No. 22 tower of the Yangmeizhou Bridge locates in Land-water Interface with many karst caves. This paper attempts to propose key points of construction for bored piles in such complicate conditions to guarantee the safety, economy and high efficiency. The main research contents include building a composite steel tube pile cofferdam as a constrcution plaform,optimizing the execution order of group of piles in the cofferdam,and improving the construction technology for bored piles in the karst area. Such study can provide significant suggestions and references for similar engineering construction..