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当前采矿凿岩技术向深孔发展,越来越多地试验用φ105～120毫米垂直炮孔崩矿与爆破成井。深孔凿岩通常使用低风压潜孔钻,以孔径95～105毫米者居多,但在硬岩中往往超过30米就钻不动,台班平均工效仅5～8米,偏斜率大多在1.4%左右。引进的高风压潜孔钻机,在凡口铅锌矿 VCR 法中平均台班工效高达20～25米,平均偏斜率为1～1.5%。但它需要昂贵的高压空压机,机器净宽1.35米以上,难以在我国大多数矿山罐笼中运搬。笔者认为,
The current mining rock drilling technology to the development of deep holes, more and more tests with φ105 ~ 120 mm vertical blasthole collapse and blasting into the well. Deep-hole drilling usually use low-pressure down-hole drilling to hole diameter of 95 to 105 millimeters are the majority, but hard rock is often more than 30 meters on the drill, the average class work efficiency of only 5 to 8 meters, most of the skew rate in About 1.4%. The introduction of high-pressure DTH drilling rig, in the VCR method where the mouth lead-zinc mine average work efficiency up to 20-25 meters, the average deflection rate of 1 to 1.5%. But it requires expensive high-pressure air compressor, the net width of 1.35 meters or more, it is difficult to transport in most of China’s mine cages. the author thinks,