联合支护技术在深基坑支护中的应用

Combined Support Technology in the Application of Bracing of Deep Foundation Pit

摘要:

郑州市花园路一基坑支护工程，由于场地周边环境的复杂性和基坑深度范围内软弱土体的存在，护坡桩、预应力锚索、花管桩及桩前被动区土体加固等技术的联合应用，确保了17～20 m深基坑壁及周边已有建筑的安全稳定，尤其是采用的高压一次成型锚索施工技术，解决了水位以下粉土及软弱土体成孔困难、锚索质量问题较多的情况。

Abstract:

This paper introduces an engineering of foundation pit support in Zhengzhou. Because of the complex surrounding environment and soft soil in the depth range of foundation pit, the combined application of slope protection pile, pre-stressed anchor cable, perforated pipe pile and passive soil consolidation around pile were used to ensure the safety and stability of 17~20m deep foundation pit wall and the existing buildings. Especially with once-forming anchor construction technology by high pressure, the hole-forming difficulties in silt and soft soil below water table were solved and the anchor cable quality was improved.