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我国地下工程每年的凿岩钻孔数量以千万米计,从而为选择新型凿岩机械研制和使用的主要方向及其最佳性能参数而进行必要的论证提供了条件。近几年来国外在地下工程中愈加广泛地采用带回转-冲击式液压凿岩机的自行式液压钻机和钻车对硬岩凿岩钻孔。采用这些钻机和钻车,使班生产能力比采用带冲击一回转式气动凿岩机的钻机和钻车提高到7～8倍,比采用带回转-冲击式气动凿岩机的钻机和钻车提高到1.5～2倍。国外有20家公司批量生产地下工程用自行式液压钻机和钻车,它们生产40种液压凿岩机、约100种钻车和10种钻机。
The annual number of rock drill holes in China’s underground engineering is tens of millions of meters, which provides the necessary proofs for selecting the main directions for the development and use of new rock drilling machinery and its optimal performance parameters. In recent years, more and more underground engineering in foreign countries with rotary - impact hydraulic rock drill hydraulic drilling rig and drilling hard rock drilling. The use of these rigs and rigs boosted class productivity up to 7 to 8 times over rigs and rigs with impact-rotary pneumatic rock drills, up to 1.5 compared to rigs and rigs with rotary-impact pneumatic rock drills ~ 2 times. Twenty foreign companies are mass-producing self-propelled hydraulic drilling rigs and drilling rigs for underground engineering. They produce 40 hydraulic rock drills, about 100 drill rigs and 10 drilling rigs.