特殊地质条件下灌注桩施工技术

灌注桩由于承载力高、对各种地基适应性强而在港口建筑物基础设计中得到广泛应用。尽管常规条件下灌注桩施工工艺已相当成熟,但特殊地形和不良地质条件仍可造成灌注桩施工困难。若对地形和地质条件认识不足,施工工艺选用不当,就会带来严重的质量安全隐患及经济损失。以南宁市某港口工程灌注桩施工为例,对特殊地质条件下冲孔灌注桩施工技术进行总结,为同类工程施工提供参考。

Construction technology of cast-in-situ pile under special geologic condition

Due to the high bearing capacity and strong adaptability to various types of foundation,the cast-in-situ pile is widely used in the harbor foundation design.Although the cast-in-situ pile construction technology is already quite mature under normal condition,it faces great difficulties under the extreme topographic condition and unfavorable geology.Incorrect understanding and improper construction technology will lead to hidden trouble for the quality and bring the economic loss.Taking the cast-in-situ pile construction for a harbor engineering in Nanjing city for example,we summarize the construction technology for the punched cast-in-situ pile under special conditions to serve as reference for the similar engineering construction.