长螺旋钻孔压灌桩嵌岩技术的改进与应用

Improvement of Rock Drilling Technology for Long Spiral Bored Grouting Pile and the Application

摘要:

普通长螺旋钻孔压灌桩适用于砂层、砾石层、硬土层及软岩层，不适用于硬度较高的岩石层。经改进钻头，加装加压系统、冷却系统后，长螺旋钻孔压灌桩可用于块石填土层、卵石层及较软—较硬基岩的钻进，拓宽了适用范围。工程实践证明，该嵌岩技术使用效果良好，具有推广价值。

Abstract:

General long spiral bored grouting pile is suitable for sand layer, gravel layer, hard soil and incompetent bed, but not for those lithosphere with high hardness. By the improvement on bit with pressure system and cooling system installing, the application scope of long spiral bored grouting pile is broadened: it can be used in block filling layer, cobble layer and soft-hard bedrock. The engineering practice proves that this technology is effective with promotion value.