Mining method for jetting concrete in wet type

Abstract

The invention relates to a mining method for jetting concrete in a wet type; a method comprises the following steps: preparing cement slurry; stirring gravel mixing material; starting air source to input high pressure air to a gravel mixing material transport pipeline in a jetting procedure; and inputting the cement slurry to a cement slurry transport pipeline through transport equipment; after jetting the cement slurry by a nozzle, adding the gravel mixing material to a jetting machine; under the action of the high pressure air, mixing and stirring the cement slurry and the gravel mixing material; finally, jetting the concrete from the nozzle. According to the invention, the method depends on current jetting equipment; a transport distance (larger than or equal to 60m) of jet concrete is can be increased greatly on a condition of ensuring invariable wet-type concrete jetting advantages; simultaneously, the method effectively avoids problems that large-scale stirring is used hardly and concrete transport equipment is limited under a coal well; production efficiency and jetting quality are improved greatly; in addition, powder dust concentration near the jetting machine is less than or equal to 10mg / m<3>.

Description

technical field [0001] The invention relates to the technical field of concrete construction, in particular to a method for mining wet sprayed concrete. Background technique [0002] Shotcrete is the use of compressed air or other power to transport the mixed concrete aggregate and additives in a certain proportion through pipelines and spray them on the sprayed surface (rock surface, wall, tunnel lining, etc.) at high speed to harden and harden. The formed concrete support layer. Because shotcrete has the advantages of high strength, low cost, and high efficiency, it has been widely used in support construction such as tunnels and coal mines. At present, what are widely used at home and abroad are dry jetting, tidal jetting and wet jetting that appeared later. Among them, the wet shotcrete technology, which emerged from the 1960s, has the advantages of easy control of the mix ratio, low rebound rate, low dust concentration, and high production efficiency due to overcoming...

AI Technical Summary

Problems solved by technology

At present, when carrying out wet shotcrete construction underground in coal mines, due to the limitation of the working space, it is difficult to promote large-scale mixing and conveying equipment. Coal mining enterprises also mostly use manual mixing and low-power mixing equipment, and most of the spraying machines they use rely on High-pressure air is used to transport and spray concrete. Although this type of machine has the advantages of small size, light weight, and simple structure, but due to the short delivery distance (horizontal delivery distance generally does not exceed 30m) during wet spraying, it needs to be used during construction. Continuous transfer of equipment and raw materials, all of which increase the labor intensity and workload during construction and reduce production efficiency

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