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以苏联建国六十周年命名的米哈伊洛夫采选公司,在黑色冶金工业部系统中率先全面转为联合穿孔工艺,其实质是使用牙轮钻机将直径250毫米的爆破深孔钻进到设计标高,然后自下而上以一定速度移动火钻喷头
The Mikhailov mining company named after the sixtieth anniversary of the founding of the Soviet Union took the lead in the Black Metallurgical Industry Department system to take the lead in the comprehensive conversion to the joint perforation process. The essence was to use a cone-roller rig to drill deep holes with a diameter of 250 mm Design elevation, then bottom-up to move the drill at a certain speed