Self-falling self-producing coal-mining method suitable for coal bed at inclined angle over 45 degrees

Abstract

The invention relates to a self-falling self-producing coal-mining method suitable for a coal bed at an inclined angle over 45 degrees. The method comprises the following steps: (1) excavating a horizontal transport tunnel along the trend of the coal bed at a distance of 10-15 meters from a soleplate of the coal bed; (2) excavating a monitoring tunnel which is parallel to the transport tunnel between the soleplate of the coal bed and the transport tunnel; (3) excavating a lower coal hole I and a sidewalk I which are communicated with the monitoring tunnel and the transport tunnel; (4) excavating a lower coal hole II and a sidewalk II which are communicated with the monitoring tunnel and the soleplate of the coal bed; (5) hollowing the bottom of a self-falling area of the coal bed to form a self-falling condition; and (6) evacuating staff and starting to fall coal. The invention has high coal yield because the coal bed can continuously and solely fall under the action of the self weight and the geological structure force; a coal-mining process is safely ensured because no staff enter an unventilated working surface during mining coal; and the working surface without being actually mined by anyone does not need any support so that the cost is decreased, and the economic benefits are increased.

Description

technical field [0001] The invention relates to a coal mining method, specifically a self-falling and self-extracting coal mining method. The method requires a coal seam inclination angle above 45 degrees. The method has high daily output, good safety and low cost. Background technique [0002] As a national strategic resource, coal is of extraordinary significance and irreplaceable in modern industry. According to relevant reports, China has become the world's largest coal mining country. Although our country is rich in coal resources and has a large amount of mining, the mining level in our country is low, the equipment is outdated, the cost per ton of coal is high, and the death rate per million tons is also very high. Coal mining workers work under very difficult conditions, and are threatened from time to time from various aspects, such as gas outbursts and explosions, water seepage accidents, soil collapse, etc. News of accidents in coal mines can be seen in the newsp...

AI Technical Summary

Problems solved by technology

Although the competent authorities continue to strengthen the supervision of coal mines and the transformation and upgrading of technology, it is still difficult to make major breakthroughs, the efficiency is low, the cost per ton of coal and the death rate per million tons are still high

Existing coal mining methods are usually from top to bottom, the workload and difficulty of digging wells are very large, the ventilation effect is not good, and the mined coal is not easy to transport out

Due to the need for ventilation, it also brings some potential safety hazards, and the total cost is very high

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