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凿井炮孔组
开挖立井的一组炮孔。立井可采用向上或向下的炮孔组进行爆破掘进。向下开挖时,爆落的岩渣堆积在井中可防止井壁坍落,比较安全,因此一次爆破凿井的炮孔组可钻深一些。向上开挖时,可用渣棚暂时存放上一轮炮孔组爆落的石渣,并利用它作为钻机的立足点,钻凿下一爆破循环的向上炮孔组
expl.
shaft sinking round
凿 井 炮孔组:
2 phrases
in 1 subject
Explosives and Explosive Ordnance Disposal
2
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