孔底注浆护壁在砂质含水层长螺旋钻孔灌注桩中的应用

Application of Wall Protection with Grouting Under-borehole in Long-spiral Bored Cast-in-situ Pile on Sandy Aquifer

摘要:

阐述长螺旋钻机在含水砂层施工中钻孔坍塌的原因和孔底注浆护壁的工艺原理，并通过工程实例，介绍孔底注浆护壁工艺在长螺旋钻孔灌注桩中的应用和效果，拓展了长螺旋钻孔灌注桩的适用条件范围。

Abstract:

The paper discussed the reasons of bored hole collapsing in sandy aquifer construction with long-spiral driller and the technological principle of wall protection with grouting under-borehole with an engineering case; and also introduced the application and effect of this technology in long-spiral bored cast-in-situ pile, the application limit for long-spiral bored hole pile was broadened.