土岩结合基坑吊脚桩支护的施工技术

Construction Technology of End-suspended Pile Support for Soil-rock Combined Foundation Pit

在上部是土体、下部是岩体的土岩结合基坑实际施工过程中,针对嵌岩深度较难得到保证,嵌岩段施工速度慢,施工成本增大,以及桩底沉渣厚度较厚、孔壁易坍孔,无法确保成桩质量等问题,结合昆明滇池度假区基坑支护工程进行了工艺改进。通过采用吊脚桩支护方式,保证了项目基坑的安全,大大节约了工程造价,同时减小了成桩难度,为土岩结合基坑的施工提供了借鉴。

In combination with the actual construction process of foundation pit,it is difficult to ensure the depth of rock socketed,the construction speed of rock socketed section is slow,the construction cost is increased,and the thickness of sediment at the bottom of pile is relatively thick,and the hole wall is easy to collapse,which can not ensure the quality of pile forming.Combined with the foundation pit support engineering in Dianchi Resort,Kunming,the technology improvement is carried out.By adopting the method of end-suspended pile support,the safety of the foundation pit of the project is ensured,the project cost is greatly saved,and the difficulty of pile forming is reduced at the same time,which provides a reference for the construction of soil-rock combined foundation pit.