静钻根植桩基础研究与实践

Research and practice of JZGZ pile foundation

传统预应力混凝土管桩通常采用静压或锤击的方式施工,但由此产生的挤土效应在一定条件下会给工程质量和安全带来极为不利的影响。静钻根植桩基础采用预钻孔及桩端扩底后在桩孔内注入一定水灰比的水泥浆形成水泥土,再植入高强预应力混凝土管桩与竹节桩的方法,解决了传统预制桩施工的挤土问题,并改善了高强度预制桩的亲土性,提高了桩基的侧摩阻力;通过在桩端进行扩底,并注入水泥浆搅拌,固化后形成扩大的端承部位,提高了端承力。简要介绍了静钻根植桩基础的施工流程,探讨了其设计及竖向抗压承载力的估算,并对工程实例中的应用进行了介绍。

Traditionally, the prestressed pipe pile is constructed by the static pressure method or the hammering method, but the soil arching effect caused by these two methods will adversely affect the quality and security of the engineering project. JZGZ pile foundation, implanting the pipe pile after grouting cement slurry into the pre-bored hole, solves the soil arching effect effectively, improves the lateral friction of the pipe pile foundation, and increases the root resistance by enlarging the scale of the root of the pile foundation. The construction process of the JZGZ pile foundation, vertical compressive bearing capacity in the design and engineering application are introduced.