大口径钻探在流砂层中成井与灌注桩工艺

Construction and Pile Grouting Techniques of Large Hole Drilling in Running Sand Layer

本文详细介绍了大口径钻探在流砂层中的成井工艺及负压钻井;并对灌柱桩的沉渣钢筋笼上浮、混凝土灌注桩等问题,提出了看法.

well completion technique and drilling technology under negative pressure of large hole drilling inrunning sand layer are introduced in detail in this paper. Views on following aspects are also advanced:how to reduce the thickness of dregs to meet the requirement; measures adopted for prevention of thebuoyancy of the reinforcing bar cage; technical reqrirement of pile grouting.