基于高压旋喷桩的超限深危基坑加固技术优化与应用效果

Optimization and application effect of overrun deep danger foundation pit reinforcement technology based on high-pressure jet grouting pile

为提高超限深危基坑材料修复加固的效果,提出基于变形监测的超限深危基坑材料修复加固措施研究。在变形监测数据的基础上,以高压旋喷桩技术进行基坑修复加固。通过进行施工准备、桩位放样、钻机就位及钻孔、灰浆制作、旋喷和复搅、冲洗及移动设备等一系列步骤完成高压旋喷桩技术对于超限深危基坑的修复加固。结果表明,采用所提方法深基坑沉降变形小,在降雨较少的春季,其沉降值在0.24 cm以下;在降雨较多的秋季,其沉降值在0.90 cm以下,均严格控制在规定值以内。所提方法可满足超限深危基坑加固工程施工处理需要,能有效完成对基坑的修复加固处理,提高基坑加固工程质量,为基坑加固提供可靠价值参考。

In order to improve the effect of repair and reinforcement of the overrun deep danger foundation pit materials,the research on repair and reinforcement measures of overrun and deep danger foundation pit materials based on deformation monitoring was proposed.On the basis of deformation monitoring data,the foundation pit was repaired and reinforced by high-pressure jet grouting pile technology.Through a series of steps such as construction preparation,pile setting out,drilling rig positioning and drilling,mortar production,rotary spraying and remixing,flushing,and moving equipment,the high-pressure rotary spraying pile technology was completed for the repair and reinforcement of overrun deep danger foundation pits.The research results showed that the proposed method had small settlement deformation in deep foundation pits.In spring with less rainfall,the settlement value was below 0.24 cm,and in autumn with more rainfall,the settlement value was below 0.90 cm,all of which were strictly controlled within the specified values.The proposed method can meet the construction needs of the overrun deep danger foundation pit,effectively complete the repair and reinforcement treatment of the foundation pit,improve the quality of the foundation pit reinforcement engineering,and provide reliable value reference for foundation pit reinforcement.