在凡口矿的建设工程中,井下砌筑混凝土用量达24600米~3。地面搅拌,除采用井内悬吊垂直输送外,还根据施工的不同情况进行了钻孔和压气输送。具体做法如下:(一)钻孔输送因井深过大,钢管垂直输送难于直达工作面,故采用了钻孔输送。该法关键是 In the mine mouth construction project, the amount of concrete masonry downhole reached 24600 m ~ 3. Ground mixing, in addition to the use of vertical suspension wells, but also according to the construction of the different conditions of drilling and gas transportation. Specific practices are as follows: (A) due to drilling depth is too large, vertical pipe difficult to direct access to the work surface, so the use of drilling. The key to the law is