PHC钢管组合桩在复杂地质条件港口中的应用

Application of PHC-steel pipe composite pile in port under complicated geologic condition

针对当前复杂地质条件下PHC管桩沉桩困难问题,以三亚某公务船码头工程为依托,结合PHC管桩和钢管桩的优点以及相关行业规范确定了PHC钢管组合桩的结构形式。针对PHC钢管组合桩的特点,从穿透较厚砂层角度出发,通过结构计算软件以及相关规范公式给出码头结构极限承载力状态,对结构计算、受力特性与桩基检测结果进行分析,提出桩基改进措施和沉桩控制条件,得出满足工程设计要求的PHC钢管组合桩。结果表明:该种PHC钢管组合桩方法满足桩基承载力及应变要求;PHC钢管组合桩在穿透较厚砂层的条件下技术可行、经济合理。

In view of the difficulty of PHC pipe pile sinking under complicated geologic condition, we determine the structural type of PHC-steel pipe composite pile based on an official ship wharf project in Sanya and combined with the advantages of PHC pipe pile and steel pipe pile and relevant industry specifications. According to the characteristics of PHC-steel pipe composite pile, from the perspective of penetrating thick sand layer, we propose the ultimate bearing capacity state of wharf structure by structural calculation software and related specification formulas. Analyzing the results of structural calculation, stress characteristics and pile foundation test, we put forward targeted pile foundation improvement measures and pile sinking control conditions, and obtain the PHC steel pipe composite pile meeting the engineering design requirements. The results show that the PHC steel pipe composite pile method meets the requirements of bearing capacity and strain of pile foundation, when penetrating the thick sand layer, the PHC-steel pipe composite pile is feasible and reasonable in economy.