Coal Mine Wet Concrete Shotcrete Technology

Abstract

The invention discloses a wet concrete spouting process for use under a coal mine. A mechanical grouting production line is adopted, and comprises a crawler-type movable wet concrete sprayer, a crawler-type movable mixing station and a rubber-wheel movable belt feeder. The process comprises the following steps: feeding a mixed dry material into a stirring hopper of a stirring station by using a belt feeder; adding water into the stirring hopper; conveying wet concrete into a hopper of the concrete sprayer; pushing to a spray gun through a pumping system; spraying the concrete onto a tunnel construction surface in a circle-drawing manner by using compressed air containing a liquid setting accelerator; performing overall grouting on the roof and sides of a tunnel through the mechanical actions such as forward / backward extension and contraction, upward / downward pitching and leftward / rightward swing of a manipulator in the tunnel. By adopting the wet concrete spouting process, a dry (damp) spraying process adopted in the conventional grouting of tunnels under coal mines in China is eliminated, the hidden danger of dust endangering the health of workers is eliminated greatly, and the grouting mechanization level is raised.

Description

technical field [0001] The invention relates to the technical field of rock roadway surrounding rock sealing, in particular to a coal mine underground wet concrete spraying process. Background technique [0002] At present, the dry (tidal) spraying process is the main method of grouting grouting in underground roadways of coal mines, that is, the sprayed materials (cement, sand, etc.) Send it to the nozzle, where there is a water inlet pipe, and the dry material is mixed with water at the nozzle and then sprayed out. This dry (wet) spraying construction method has the following problems: [0003] 1) Excessive dust content in the air at the site seriously damages the health of miners. On the one hand, the high rebound rate makes the air in the construction site full of dust. On the other hand, it is precisely because the dry (wet) spraying process uses the rotor piston type jetting machine and the high-pressure air to feed the material, and the air leakage during the mixing...

AI Technical Summary

Problems solved by technology

[0003] 1) Excessive dust content in the air on site seriously damages the health of miners

On the one hand, the high rebound rate makes the air in the construction site full of dust. On the other hand, it is precisely because the dry (wet) spraying process uses the rotor-piston jetting machine and high-pressure air to feed the material. Inevitably, dust will fly around the machine

[0004] 2) Low level of mechanization

During dry (wet) spraying, the spray gun is operated manually, which has the problem of high labor intensity

[0005] 3) The rebound rate of dry (wet) spray is as high as 40%, which is a serious waste of resources

[0006] 4) The quality of dry (wet) sprayed concrete is not easy to control

[0007] For this reason, many scientific and technical personnel in the industry are constantly improving the technical level and making efforts to improve construction equipment, such as Chinese Patent Application No. 200920103135.5 discloses a "coal mine underground wet shotcrete machine" and Chinese Patent Application No. "Underground coal mine wet spraying continuous operation device", but these are not matched with specific corresponding spraying process

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