drill pipe bore
... 钻杆扭曲：drill pipe winding up 钻杆内孔：drill pipe bore 钻杆内加厚突出区：run-out area ...
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非开挖反向回拉扩孔施工过程中时常出现钻杆正转而发生退扣，造成钻具孔内脱落事故的反常现象。
The dropping buckle usually occurs when reverse pulling is used for expanding the bore in the trenchless construction, thus causing the fall-off of the drilling tools.
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