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厦门怡山商业中心裙楼设33根柱下抗拔桩及21根纯抗拔桩,采用无黏结预应力技术,桩身直径1.4m,桩身空孔直径2.4m,单桩竖向承载力4 200kN。介绍了预应力筋安装、预应力筋与钢管柱定位环板相交问题处理、预应力筋张拉及抗拔试验等关键技术。解决了施工过程中预应力筋向下滑落、桩底预应力固定端局部承压、桩顶标高以上部分预应力筋保护等问题,取得良好效果。
33 pillars anti-pull pile and 21 pure anti-pull pile were built in the podium of Xiamen Yishan Commercial Center. Using unbonded prestressed technology, the diameter of pile body is 1.4m, the diameter of pile hole is 2.4m, the vertical bearing capacity of single pile 4 200kN. The key technologies such as the prestressing tendons installation, the intersection of prestressing tendons and the steel pipe column locating ring plate, the prestressing tendon tensioning and the pull-out test are introduced. It solves the problems of the downward descent of prestressing tendons, the partial pressure at the fixed end of prestressed pile bottom and the protection of some prestressing tendons above the top of pile top, which achieves good results.