基岩大口径垂直钻孔施工实践

Construction Practice of Vertical Borehole with Large Diameter in Bedrock

摘要:

针对基岩中施工大直径垂直钻孔的难点，介绍了采用小径导向孔、加放活导向器、用小径导向孔对大口径钻孔进行监测、使用具有超前导向的大口径扩孔钻头等技术措施，成功实现了在基岩中施工大口径垂直钻孔和全孔下放大直径钢管的施工过程。

Abstract:

According to the difficulties in construction of vertical borehole with large diameter in bedrock, the paper introduced the successful construction process of large diameter vertical borehole in bedrock and full-hole large diameter steel pipe laying by small diameter pilot hole, movable guide apparatus, large diameter borehole monitoring with small diameter pilot hole and large diameter expanding bit with advanced pilot.