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

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.