水泥土桩内置PRC管桩在深基坑工程中的应用

Application of Cement Mixed Soil Columns with PRC Pipe Pile Inclusions in a Deep Excavation Project

管桩具有造价低、施工快、环境污染少等优点,特别是PRC管桩配置了预应力钢筋及普通钢筋,其抗剪承载力及抗弯承载力更高,在基坑支护工程中得到较广泛的应用。针对管桩施工过程中的挤土问题,结合珠海市金发工业区更新项目,介绍了在富水厚砂层地区采用三轴搅拌桩内置PRC管桩的一种支护设计方案,并对现场施工工艺、开挖情况及监测数据进行了分析,工程实践表明:三轴搅拌桩内置管桩工艺能解决管桩施工引起的挤土问题,满足基坑开挖的止水要求并保证了周边环境的安全,值得同类基坑工程参考。

The pipe pile has many advantages,such as low cost,fast construction,and less environmental pollution.In particular,the PRC pipe pile equipped with prestressed steel bars and ordinary steel bars is widely used in the deep excavation because of the high shear and flexural resistances.In response to the lateral squeezing problem during the construction of the pipe pile,combined with the deep excavation project in Zhuhai,a design program used cement mixed soil columns with PRC pipe pile inclusions in a sand layer area is introduced,the construction process,conditions of the excavation and the monitoring data have been analyzed.The results show that the pipe pile embedded in the triaxial mixed soil column can resolve the issues of the lateral squeezing in the soil caused by the construction and protect the surrounding environment and results in a safe excavation.It can also provide a valuable reference application of similar projects in the future.