H＋Hat组合型钢板桩沉桩特性现场试验研究

摘要

H ＋Hat 组合型钢板桩构造简单、抗弯刚度大、可反复使用且经济性好，具有广泛的应用前景，但在国内尚未应用而缺乏验证。采用现场重复压、拔桩试验，对 H ＋Hat 组合型钢板桩的压、拔桩力变化规律及沉桩速度进行了研究。对反复压、拔工况下的全宽、锁口张开度、侧弯、翘曲变形进行了分析；对压桩设备进行了现场验证。结果表明：采用现有的施工设备能够较快地将 H ＋Hat 组合型钢板桩压入土体，H ＋Hat 组合型钢板桩在反复压、拔后变形满足要求，可以在基坑、围堰、码头等工程中推广应用。%H +Hat combined steel sheet pile has a broad prospect of application for its advantages of simple struc-ture,big bending stiffness,repeated use and cost effectiveness,however,it has not been applied and lacks verifi-cation in China.Field test was conducted to study the variation of static pile press-extracting force and pile jacking speed;and the full width,lock opening,side bending and buckling deformation in the condition of repeated jack-ing and extracting were analysed;the applicability of static pile press-extracting machine was also verified.Results show that the existing machine can rapidly press the H +Hat combination steel sheet pile into soil and the deforma-tion under repeated pressing and extracting meets standard requirement.It can be applied to engineering of founda-tion pit,cofferdam and wharf.