Foundation pit supporting system and construction method thereof: Fid-Bau Portal

Foundation pit supporting system and construction method thereof

ZHANG SHIZHONG / ZHAO YUETING / SUN BIN / TONG QIANG

The invention relates to a foundation pit supporting system and a construction method thereof. The supporting system comprises a water stop pile layer, a supporting pile layer, a concrete bottom sealing layer and a grouting bottom sealing layer; the supporting pile layer and the water stop pile layer are sequentially arranged on the side face of a foundation pit from inside to outside; and the concrete bottom sealing layer and the grouting bottom sealing layer are sequentially arranged on the bottom face of the foundation pit from top to bottom. The supporting system is high in waterproofness and good in stability, when the supporting system is used for the foundation pit of a strong permeable stratum, the supporting system can meet the requirement for small deformation of the foundation pit, and meanwhile long-time safe operation in the foundation pit can be guaranteed. The construction method comprises the steps that the position of the foundation pit is marked firstly, then the water stop pile layer and the supporting pile layer on the periphery of the foundation pit are constructed, the grouting bottom sealing layer is formed at the designed depth in a drilling grouting manner within the marked foundation pit range, then the foundation pit is excavated, the concrete bottom sealing layer is poured, efficiency is high, the safety degree is high, and the construction requirement of the complex environment can be met.

本发明涉及一种基坑支护体系及其施工方法，该支护体系包括止水桩层、支撑桩层、混凝土封底层和注浆封底层；所述支撑桩层和所述止水桩层由内至外依次设置在基坑的侧面；所述混凝土封底层和注浆封底层由上至下依次设置在基坑的底面。该支护体系防水性强，稳定性好，在面对强透水地层基坑时，该支护体系可以满足基坑变形小的需求，同时能保证长时间基坑内安全作业的问题。施工方法先对基坑位置进行标识，然后再施工基坑四周位置的止水桩层和支撑桩层，再在标识的基坑范围利用钻孔注浆的方式在设计深度形成注浆封底层，之后再进行开挖基坑，浇筑混凝土封底层，效率高，安全度高，可以满足复杂的环境的施工要求。

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