Research on High Efficiency Charging and Mechanized Sealing Technology of Deep Hole Presplitting Blasting in Roof

In order to solve the problem of long sealing time and poor effect in the deep-hole presplitter blasting technology, the inorganic two-component blasting sealing material with a fixed water-cement ratio of 0.8:1, with "cement, gypsum and lime" as the main, "quick-setting agent, water-reducing agent and early-strength agent" as the auxiliary, and the matching double-bag sealing device were developed, and a set of rapid sealing process suitable for deep-hole blasting was designed. The field test was carried out in 43153 multipurpose roadway of Chengzhuang Mine. The application results show that the blasting sealing material with fast setting speed and high strength can meet the needs of sealing holes, and the perforation rate is far less than 4-8% of the blasting mud sealing hole. The fast sealing process designed and developed to complete a hole sealing operation only takes 14min, which not only improves the sealing efficiency, but also reduces the labor intensity of workers and realizes the mechanization of the sealing operation.