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为了开采高山矿务局马格尼特铁矿的下部体矿,必须在f=11～13的坚硬岩石中将箕斗-罐笼井从-450米水平延深160米到-610米水平。考虑到在-610米水平已从生产罐笼井掘进有平巷,故设计规定箕斗-罐笼井的延深方法是:先从-610到-450米水平掘进超前天井,而后采用下部出碴的凿岩爆破法进行扩大。作者建议使用2KB型天井钻机钻进1.5米直径的超前天井,以代替使用爬罐的传统凿岩爆破法。但2KB型天井钻机只能钻进100米以
In order to mine the lower body ore of the Magnetite Mine of the Alpine Mining Administration, skip-cage wells must be delaminated from -450m to 160m to -610m in hard rock of f = 11-13. Considering that at -610 meters level, there have been tunneling from production cages and wells, the design provides for a method of extending the skips - cages and cages by first tunneling the antecedent from -610 to -450 meters and then using the lower ballast Drilling blasting method to expand. The authors suggest drilling a 1.5-meter-diameter lead-in patio using a 2KB pit drill instead of the traditional rock-blasting method using a canister. However, 2KB-type drilling rig can only drill 100 meters