旋挖扩底灌注桩在软土地基工程应用中的经济性分析
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（上海市城市建设设计研究总院， 上海 200125）
［摘要］以中国2010年上海世界博览会B片区地下空间工程为依托，对旋挖扩底灌注桩和两种桩径的钻孔灌注桩、后注浆灌注桩共五种布桩方案的造价进行了对比分析，从而对旋挖扩底灌注桩在软土地基工程应用中的经济性作出了评价。研究结果表明，旋挖扩底灌注桩相对于钻孔灌注桩，能有效提高单桩的抗压与抗拔承载力，可以有效减少总桩数，施工工期短，总造价最低，比较适用于采用逆作法施工的软土地基地下空间工程。［关键词］旋挖扩底灌注桩; 经济性分析; 软土地基; 工程应用; 地下空间中图分类号：TU473 文献标识码：A 文章编号：1002-848X(2016)08-0061-04
Cost analysis of the engineering application of screw-drilled under-reamed cast-in-situ piles in soft groundLi Feng, Xu Zhuangtao, Zheng Zhenpeng(Shanghai Urban Construction Design & Research Institute, Shanghai 200125, China)Abstract: Based on underground space project of B area of Expo 2010 Shanghai, the comparative analysis of costs of five pile arrangement schemes was compared and analyzed, including one screw-drilled under-reamed cast-in-situ pile, two cast-in-situ shaft piles with different pile diameters and two base-grouted bored piles with different pile diameters, in order to evaluate the cost of screw-drilled under-reamed cast-in-situ pile in engineering application of soft ground. As shown in the results, the screw-drilled under-reamed cast-in-situ pile has higher compressive bearing capacity and uplift bearing capacity than the cast-in-situ shaft pile. The screw-drilled under-reamed cast-in-situ scheme needs less piles, shorter construction period and lower cost, so such type of pile is suitable for underground space projects in soft ground which are built by top-down construction method.Keywords: screw-drilled under-reamed cast-in-situ pile; cost analysis; soft ground; engineering application; underground space
作者简介：李峰，博士，高级工程师，Email: adrianqiao@163.com。
