A Coal Mine Wet Shotcrete Process

Abstract

The invention provides a coal mine wet method guniting process and belongs to the technical field of coal mine wet method guniting. The coal mine wet method guniting process comprises the following steps of 1.1 manufacturing mixed dry materials, namely performing dry mixing of a sand and stone mixed material, cement, coal ash, a water reducing agent, fiber and an accelerator to form the mixed dry materials; 1.2 performing dry material transportation, namely transporting the mixed dry materials to a guniting working face under a coal mine; 1.3 manufacturing wet slurry, namely pouring the mixed dry materials into a stirring, conveying and guniting integrated machine and simultaneously adding water to perform stirring to form evenly-mixed wet slurry; 1.4 performing guniting operation, namely utilizing a plunger type wet spraying machine (11) to perform continuous and quick guniting operation to the working face needing guniting; and 1.5 cleaning a pipeline, namely cleaning the guniting pipeline of the plunger type wet spraying machine (11), keeping the pipeline to be clean and preventing blockage. By means of the coal mine wet method guniting process, dry mixing, conveying, stirring, guniting and other processes are tightly combined integrally, the processes are compact, manpower is saved, the efficiency is improved, guniting materials are even and consistent in proportion, and the guniting effect is remarkable.

Description

technical field [0001] The invention relates to a coal mine wet spraying process, which belongs to the technical field of coal mine wet spraying. Background technique [0002] The bolt-shotcrete support of the roadway is a support method developed on the basis of the scientific theory of self-stabilization of the surrounding rock. The shotcrete, the bolt and the surrounding rock together form an effective bearing arch, which improves the stability of the roadway , improve the self-stabilization ability of the surrounding rock, and change passive support to active support. At present, there are mainly two spraying methods in domestic coal mines: dry (tidal) spraying technology and wet spraying technology. Dry shotcrete (dry spraying) is to mix cement, aggregate and quick-setting agent in proportion, and add After the spraying machine, use compressed air to pass the material through the hose, add water to the nozzle to form a material beam, and push it to the sprayed working ...

AI Technical Summary

Problems solved by technology

The rotor-type wet spraying machine is limited by the wind pressure of the mine system, and the spraying distance is generally not more than 30 meters, which cannot meet the requirements of digging equipment such as gangue pickers and gangue conveyors on the working face of the developed roadway; not tall

The underground mixing station is used for transportation, which is equivalent to a large horse-drawn cart, which not only increases the occupation of underground equipment, but also increases the difficulty of pipeline cleaning; the third is that it requires a lot of labor and high cost

Many application units still use on-site mixing and on-site mixing when studying the wet spraying process, which requires a lot of labor, a large amount of labor, and high costs; Fourth, the preparation time is long, which affects the overall excavation speed

On-site mixing of materials increases the process of loading and unloading materials, and the preparation time is long, resulting in low spraying efficiency and affecting the overall tunneling speed

Fifth, the matching problem of wet spraying machine has not been solved

Even if the plunger type wet spraying machine is used to solve the distance problem, but the mixing and conveying problem is not solved, the superiority of the wet spraying process cannot be brought into play, resulting in the wet spraying process not being used normally

[0006] Therefore, because the working conditions of coal mines are different from the construction conditions of railways and highway tunnels on the bottom surface, the production excavation of coal mines often extends hundreds of meters underground, the shotcrete roadway is narrow, the space is small, and the excavation equipment occupies a lot of space. Large size, which is not conducive to the arrangement and operation of spraying equipment. The wet spraying process, which was originally mature in the construction of railway and highway tunnels, is not well applied underground in coal mines. There is an urgent need for a systematic solution for wet spraying in coal mines

Images