高桩码头刚接PHC管桩新型接桩结构设计

Structure design of a new type of pile connection for rigid PHC pipe pile of high pile wharf

PHC管桩对工程地质适应性较强,在港口工程中被广泛应用。当其以坚硬黏土层、密实砂层或基岩作为持力层且上述土层起伏变化剧烈、无规律可循时,沉桩质量极难控制,易造成打高或打低等异常桩问题。对于打低桩而言,为保证工程进度和节省投资费用,一般优先考虑采取接桩措施。针对打低桩接桩方案,重点探讨了一种PHC管桩新型接桩结构,即根据实际桩顶高程偏差程度,采用桩芯槽钢加强或联合桩顶外包圆柱形混凝土处理,以达到桩基与上部结构之间刚性连接的要求。实践结果表明:该种新型接桩结构适用于不同斜度的打低桩,通过调整上部结构尺度,能够有效规避常规接桩所导致的额外结构自重和施工难度增加偏大、整体外观质量较差等弊端。

PHC pipe piles have strong adaptability to engineering geology,and are widely used in port engineering.When it takes hard clay layer,dense sand layer or bedrock as the bearing layer,and the above soil layers fluctuate violently and irregularly,the pile sinking quality is very difficult to control,which is easy to cause the problem of sinking abnormal piles such as high or low.For sinking low pile,in order to ensure the project progress and save investment cost,pile connection measures are generally given priority.Aiming at the connection scheme of sinking low pile,this paper focuses on a new type of pile connection structure of PHC pipe pile,that is,according to the actual elevation deviation of pile top,the pile core channel steel is used to strengthen or combine the pile top with cylindrical concrete,so as to meet the requirements of rigid connection between pile foundation and superstructure.The practice results show that the new pile connection structure is suitable for sinking low piles with different slopes,which can effectively avoid the disadvantages of additional structural weight,increased construction difficulty and poor overall appearance quality caused by conventional pile connection by adjusting the scale of superstructure,and can provide reference for similar projects.