潜孔锤引孔在水上厚抛石层PHC沉桩中的应用

Application of DTH hammer hole-leading in PHC pile sinking in thick ribbon layer on water

针对斜坡式抛石结构引堤上PHC管桩在沉桩过程中难以穿透厚抛石层的问题,以某综合管架工程为例,进行施工工艺实践研究。在对常规引孔工艺进行对比的基础上,提出潜孔锤先引孔再施打预应力混凝土管桩的解决方案,并简要介绍了潜孔锤引孔设备及技术参数、施工工艺流程、引孔过程中存在的问题及相应解决措施。应用结果表明,采用潜孔锤引孔后的预应力混凝土管桩能高效贯穿抛石结构层,沉桩后桩身结构完整性好,单桩竖向承载力满足设计要求,该工艺切实可行。研究成果可为类似地基沉桩施工提供参考。

Aiming at the problem that the PHC pipe pile on the inclined riprap embankment is difficult to penetrate the thick riprap layer during the pile sinking process,this paper takes a comprehensive pipe frame project as an example to conduct a practical research on the construction technology practice.On the basis of comparing the conventional hole-leading technology,the solution of the DTH hammer first leading hole and then applying the prestressed concrete pipe pile is proposed.Furthermore,the equipment and technical parameters,construction process,problems existing in the hole-leading process and corresponding solutions are briefly introduced.The application results show that the prestressed concrete pipe pile after the DTH hammer leading hole can efficiently penetrate the riprap structure layer,the structural integrity of the pile body after the pile sinking is good,and the vertical bearing capacity of the single pile meets the design requirements.The research results can provide reference for similar foundation pile sinking construction.