钢管连接方式对钻孔注浆钢管桩轴压承载性能影响的试验研究-华南地震

文章信息/Info

Title:: xperimental Study on Influence of Steel Pipe Connection on Axial Bearing Capacity of Bored Grouted Steel Tubular Piles

Author(s):: LIU Lian LYU Wenlong PENG Lishun; Guangdong Provincial Academy of Building Research Group Co., Ltd，Guangzhou 510500，China

Keywords:: Bored grouted steel tubular piles; Steel pipe connection; Axial compressive bearing capacity

摘要:: 近年来，钻孔注浆钢管桩在基础加固工程中得到了越来越广泛的应用，受设计桩长、施工空间以及钢管规格的限制，工程中钢管常需接长，而钢管连接方式对桩身承载性能影响的相关研究甚少。通过对5组不同连接方式的钻孔注浆钢管桩试件进行轴压试验，得到并分析了不同连接方式下的钻孔注浆钢管桩轴向抗压承载力极限值和承载性能。结果表明：本次试验采用的各种钢管连接方式均为有效连接，未出现因接头破坏导致钻孔注浆钢管桩桩体破坏的现象；钢管的不同连接方式会导致钻孔注浆钢管桩承载力有不同折减，本次试验得出的折减率为11%~23%；在接头刚度足够的情况下，钻孔注浆钢管桩的轴向抗压承载力不因接头承载力的提高而提高。

Abstract:: In recent years, bored grouted steel tubular piles have been used more and more widely in foundation reinforcement projects. Due to the limitations of design pile length，construction space and steel pipe specifications, the steel pipe often needs to be lengthened. There are little researches on the impact of and the steel pipe connection method to the pile bearing performance. In this study，the axial compression tests of five sets of different grouting steel pipe pile specimens is carried out，and the axial compressive bearing capacity limit value and bearing capacity of bored grouted steel tubular piles under different connection modes are obtained and analyzed. The results show that：the connection methods of various steel pipes used in tests are all effective connections，and there is no phenomenon that the piles of bored grouted steel tubular piles are damaged due to joint failure. different connection modes of steel pipe will lead to the different reduction of bearing capacity of bored grouted steel tubular piles，and the reduction rate obtained in this test is 11%~23%; the axial compressive bearing capacity of the bored grouted steel tubular piles are independent of the joint bearing capacity when the joint stiffness is sufficient.