预埋钢管注浆技术在岩溶塌陷基础加固中的应用

The application of technology embedded steel pipe in the karst collapse

采用人工挖孔桩加固岩溶塌陷受损建(构)筑物基础,因受施工空间限制无法采用超前钻探揭示桩端持力层下部岩层情况,可能存在隐伏溶洞,对基础加固存在风险。本文结合工程实例,在岩溶塌陷治理采用人工挖孔桩中预埋钢管,探明持力层下部潜伏溶洞情况及对发现的溶洞进行注浆充填处理,阐述了岩溶注浆加固的设计方案、施工工艺、注浆量计算及技术要求。经多种手段检验,表明注浆加固效果良好。

Manual - digging pile used to reinforce the damaged buildings （ structures ） foundation in karst collapse has advantages of high bearing capacity,guaranteed quality, low cost, simple equipment and the impact of the construction space is small. However, in karst area,the geological condition is complex, the lower part latent caverns in bearing stratum are often unable to clearly ascertain their shapes and sizes. It has risk to use hand - dug pile only. The applica- tion of manual - digging pile embedded pipe grouting technology is introduced in karst collapse combining with an engineering example, the stratum of caves can be ascertained and the caves can be filled by using manual - digging pile embedded steel pipe in the karst collapse disaster.