钻孔灌注桩桩顶后期缩径原因分析及对策

钻孔灌注桩常因桩顶混凝土质量差、河床下降等原因外露,在水流和砂石的作用下发生桩顶后期缩径,钢筋外露并锈蚀,降低了结构的耐久性和承载力,缩短了工程的使用寿命.建议通过加强施工管理,提高桩身混凝土质量,以及恶劣环境下保留钢护筒等措施,避免桩顶后期缩径.

Analysis of After - necking of Bored Pile Top and Countermeasures

After exposing of bored pile top by poor concrete quality and nverbeclarop, atternecking of pne top and corrosion of steel axe happened under the action of water and sand, which reduce the structure durability and capacity and service life of the project. It is suggested that after - necking of pile top can be avoided by improving the construction management and the quality of pile shaft concrete and reserving pile casing in bad environment.