降低人工挖孔桩扩孔率

Reducing the artificial dig hole pile hole expansion rate

针对某工程中人工挖孔桩扩孔率超标的现象进行了研究,分析了影响扩孔率的因素,并从爆破参数、炮眼布置、炸药类型、护壁施工等角度入手,制定了降低扩孔率的对策,同时提出了相应的质控措施,取得了最佳的施工效果。

This paper researched the exceeding phenomenon of artificial dig hole pile hole expansion rate according to a certain engineering, ana- lyzed the factors influence of hole expansion rate, and from the blasting parameters, blast holes layout, explosive types, wall protection construc- tion and other views, formulated the countermeasures to reduce hole expansion rate, and put forward corresponding quality control measures, achieved the best construction effect.