1) bottom-extending aperture
扩底孔
1.
This paper mainly introduces the new use, preponderance analysis and construction technology of the bottom- extending aperture , and designs the positive and negative bit and its construction method comparing with the usual bottom-extending aperture.
本文主要介绍了扩底孔的创新应用、优势分析及成孔方法;并结合常规扩底孔成孔方法设计出新型正反转扩底钻头及其施工方法。
2) Hole-springing hole
扩底炮孔
3) bored and bottom-enlarging
钻孔扩底
1.
This paper introduces boring method of bored and bottom-enlarging mudjack pile in dry operation.
本文简单介绍了干作业钻孔扩底桩的成孔处理方法。
4) enlarged opening on pile bottom
桩底扩孔
5) boring and expanding bottom pile
钻孔扩底桩
1.
Analysis on construction method of boring and expanding bottom pile in permafrost region in Qinghai-Tibet plateau;
青藏高原多年冻土区钻孔扩底桩施工方法浅析
2.
Construction technology of boring and expanding bottom pile in Qinghai-Tibet Plateau;
青藏高原上钻孔扩底桩的施工技术
6) club-footed pile
挖孔扩底桩
1.
Design of club-footed pile in large diameter hole;
大直径挖孔扩底桩的设计探讨
补充资料：充扩
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