高压旋喷桩与倾斜锚固桩在加固岩溶强烈发育地基中的应用

Application of High-pressure Jet and Spin Pile and Slope Anchoring Pile in Foundation Improvement of Karst Strongly Development

以中国人民银行怀化分行营业大楼为例,探讨高压旋喷注浆技术和倾斜锚固技术在加固岩溶强烈发育地基中应用的基本工艺,该工程基础原设计为冲击成孔嵌岩灌注桩,因岩基中溶洞发育,在中南部还存在一个深度超过100m的大型溶槽,岩面起伏极大,施工和成桩困难、进度极慢,造价较高,针对上述实际情况,为减小施工难度,加快施工进度,降低造价,改用高压旋喷桩加固土体地基及倾斜锚固桩处理大型溶槽,并取得了良好的效果。

By taking the business building of Huaihua Branch Bank of the Bank of China as an example, the paper discusses the basic processes for application of high-pressure rotary jet and spin grouting technology and slope anchoring technology in improving the foundation of karst strongly developed; The foundation of the project was planned to be designed as jetting bore embedded cast-in-place pile. The solution cavity is well developed in the rock foundation and a large solution slot over 100m in depth exists in the south central part, the rock surface fluctuates extremely and it is difficult to construct and complete the files, the processing is extremely slow and the construction cost is relatively high. Aimed at the above practical situations, it is planned to adopt the high - pressure jet and spin piles to consolidate the soil foundation and adopt the slope anchoring piles to improve the large solution slot in order to reduce the difficulties on construction, quicken the construction progress and reduce the construction cost and a good effect is obtained.