提出使用预应力管桩作为群桩基础,以避免岩溶地区桥梁桩基施工中出现塌孔等事故。通过讨论预应力管桩的适用条件,并对不适宜直接使用的条件下采用桩底、桩侧注浆提高承载力的方法进行了分析,认为预应力管桩在合适条件下具有明显的缩短工期的经济优势,在一些不适用的地质条件下通过注浆加固也可采用。 Prestressed pipe piles are proposed as a group pile foundation to avoid accidents such as collapse of holes during the construction of bridge pile foundation in karst areas. By discussing the applicable conditions of prestressed pipe piles and analyzing the methods of increasing the bearing capacity by pile bottom and grouting at the side not suitable for direct use, it is considered that the prestressed pipe piles have a significant shortening period under appropriate conditions The economic advantages, in some not applicable to the geological conditions by grouting reinforcement can also be used.