串珠状岩溶地基钻孔桩施工技术

Construction Technology of Bored Pile in Beaded Karst Foundation

针对串珠状岩溶地基桩基施工过程中易出现漏浆、塌孔等以及当前常用方法难以适用的现状,依托实际工程,从串珠状岩溶地基的地质形态出发,研究提出了钢护筒分层全程跟进施工方法,并进行了工程应用。实践表明:该法能有效避免桩基施工过程中的诸类常见事故,较好地解决了串珠状岩溶地基成桩困难的难题,与传统方法相比,具有显著的经济效益。

In view of the current situation that some accidents（ e. g. mortar leakage and hole collapse） appear frequently during the pile foundation construction process in beaded karst foundation and the common methods at present can not be applied effectively,a construction method of layered follow up with steel pile casing throughout the whole process is put forward and implemented in construction practice. The results indicate that the method can reduce some common accidents during the pile construction process effectively,and solve the difficult problems of pole forming in beaded karst foundation preferably,and it has prominent economic benefit compared to the traditional method.