多层地基土超长钻孔桩成桩技术分析

摘要

Together with project case, this paper discusses on piling technology for super-long bored pile with multi-layer subsoil by equipment selection, drilling tools, construction process and test.%以济南市二环西路改造为背景，介绍济南市太平河北桥在施工过程中遇到多层地基土及不稳定地层等技术难题时，选用ZSD-3000型液压钻机和西325mm×25mm法兰钻杆，配双侧高压气管，采用反循环成孔施工配合气举反循环工艺，保证灌注前孔内泥浆指标，从而提高了施工效率，取得了较好的效果。