H+Hat组合型钢板桩沉桩特性现场试验研究

Field Test of Pile Driving of H+Hat Combined Steel Sheet Pile

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.