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连续采矿正在实现近十余年来由于各国采矿工作者的共同努力,在连续采矿方面已取得了很大成就。 (一)天井钻进各国使用的天井钻机由12台发展到246台。当前取得主要成就的标志是扩井直径达到4.8米,并可沿垂直到水平的任一角度钻进;钻机的推力(如81R型达544吨)和可靠性也都大大提高。美国近年来用天井钻机钻进的进尺,已超过用凿岩爆破法掘进的进尺,个别矿山用钻进法打的天井占85％。用于盲天井钻进的
Continuous mining is in progress For more than a decade, due to the joint efforts of mining workers from all over the world, great success has been achieved in continuous mining. (A) The number of wellbore drilling rigs used for drilling wells in various countries has grown from 12 to 246. At present, the major achievements are marked by the expansion of wells up to 4.8 meters in diameter, which can be drilled at any angle from vertical to horizontal; the thrust of drilling rigs (eg 544 tons for Type 81R) and the reliability are also greatly enhanced. In recent years, the footage marched by the United States in the use of a patio drill has surpassed the footage taken in the drilling by blasting. Some mines have 85% of the wells drilled by drilling. Used for blind patio drilling