问世于六十年代的反井法,由于受到当时刀具技术的发展而十分缓慢。直到1967年,硬岩扩孔刀头与刀具在市场上的供应还是很少的。到了六十年代末,刀具技术有所突破,才使反井法得到迅速发展。现在,该法已被广泛应用于钻进井下人行天井、通风井、放矿溜井和其他安装辅助设备井。在水电站地下工程 The anti-well method that came out in the 1960s was very slow due to the development of cutting tool technology at the time. Until 1967, the supply of hard rock reaming heads and tools in the market was still small. By the late 1960s, breakthroughs in cutting tool technology had led to the rapid development of anti-well methods. Nowadays, the law has been widely used to drill underground pedestrian patios, ventilation shafts, ore-handling chutes and other auxiliary equipment wells. Underground works in hydropower station