Coal mining roadway

Abstract

The invention discloses a coal mining roadway. The coal mining roadway comprises a working surface, a ventilation roadway and a transportation roadway, wherein the ventilation roadway is arranged on a seam floor of a coal seam, and the transportation roadway is arranged between a coal seam roof and the seam floor. The working surface comprises a shelving working surface section, a transition circular-arc working surface section and an inclined working surface section, wherein the working surface is arranged in an inclined mode in the longitudinal direction, the shelving working surface section and the inclined working surface section are smoothly connected together through the transition circular-arc working surface section, the shelving working surface section is arranged on the lower oblique portion of the transition circular-arc working surface section, and is communicated with the transportation roadway, the inclined working surface section is arranged on the seam floor, is arranged on the upper oblique portion of the transition circular-arc working surface section, and is communicated with the ventilation roadway, a shelving included angle alpha is formed between the shelving working surface section and the horizontal plane, an inclined included angle beta is formed between the inclined working surface section and the horizontal plane, and the shelving included angle alpha is smaller than the inclined included angle beta. The coal mining roadway can improve the stress condition of an end support and the stress condition of a crab bearer of a large-dip-angle fully mechanized caving face, has control over downward sliding of the end support and the crab bearer of the large-dip-angle fully mechanized caving face, and is high in coal mining efficiency.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a coal mining roadway used in coal seam mining with a coal seam dip angle above 25°. Background technique [0002] The comprehensive mechanized top-coal caving mining method in coal mining has obvious advantages such as low driving rate, high efficiency, strong adaptability and easy realization of high production, and has been more and more widely developed in my country. It has become one of the most effective methods for thick coal seam mining, and it is also an important way for mines to achieve high production and high efficiency. The essence of the comprehensive mechanized top-coal caving mining method is to arrange a comprehensive mechanized long-arm working face with a mining height of 2-3m along the bottom of the coal seam (or section), and use conventional methods for mining, using mine pressure or supplemented by artificial loosening methods , the top coal above th...

AI Technical Summary

Problems solved by technology

[0004] 1. The end bracket at the lower end of the working face and the basic bracket (or transition bracket) form a large top beam step, which causes pedestrians, coal transportation, and material transportation to be blocked;

[0005] 2. Due to the large inclination angle of the working surface, the lower end and the head support are subject to a large tendency along the inclined direction, and the phenomenon of squeeze and bite between the end support and the head support is easy to occur. Not only is it difficult to move the frame, but the side guard of the support The damage is serious, and it is very easy to cause the frame to fall;

[0006] 3. Due to the large inclination angle of the working face, the scraper conveyor is easy to slide and run down, which is very unfavorable to the anti-fall and anti-skid of the entire working face equipment;

[0007] 4. Large pieces of coal gangue falling off the working surface or rolling off the scraper conveyor can easily reach the lower exit, which poses a great safety hazard;

[0008] 5. Stress concentration in the triangular area at the top of the lower end, difficult to support and easy to collapse

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