一,加快新井建设的关键—发展竖井掘进机械提高煤炭产量,主要途径是加快新井建设。由于我国许多煤田冲积层厚,储量丰富,地形平坦,因此在新建矿井中,采用竖井开采方式不断增加。73年重点煤矿中,竖井的生产能力要占44%之多,近来又有增长。在金属矿山中,竖井开采占50%左右。井径井深随产量和综采的发展,亦趋大而 First, speed up the key to the construction of new wells - the development of shaft excavation machinery to increase coal production, the main way is to accelerate the construction of new wells. Due to the thick alluvial layer, abundant reserves and flat terrain in many coalfields in our country, the way of shaft mining is increasing in new mines. Among 73 key coal mines, shaft production capacity accounts for 44% of the total and has recently increased. In metal mines, shaft mining accounts for about 50%. Well diameter well depth with the development of yield and fully mechanized mining, but also tend to be larger