Full Negative Pressure Continuous Mining Continuous Full Step Replacement "Three Down" Coal Mining Method

Abstract

The invention discloses an all-negative pressure continuous-mining continuous-filling step-by-step replacement mining method for coal underneath cities and towns, industrial buildings, railways and other buildings. The main points of the invention are as follows: the whole coal mining zone is divided into a plurality of production units, each production unit is composed of three branch roadway working faces, and branch roadways enable conveyor gateways and air return ways to be communicated; a jump mining sequence is employed, i.e., mining is started from unit 1 and then carried out according to a sequence of unit 1, unit 3, unit 5 ...and so on, and then mining is restarted from unit 2 and then carried out according to a sequence of unit 2, unit 4, unit 8 ... and so on until extraction and filling of all the production units in the whole zone are finished. According to the invention, digging, extraction and filling are spatially assigned to different branch roadways, so the above-mentioned three procedures are effectively isolated and do not influence each other, and the degree of safety is substantially improved; A gangue filling belt conveyor and a gangue conveyor are employed for filling in branch roadways where extraction is finished, so parallel extraction and filling is realized.

Description

technical field [0001] The invention relates to a coal mining method in a mine. Background technique [0002] According to incomplete statistics, the "three-down" coal pressure in my country's production mines reached 14.3 billion tons. The "three-down" coal pressure refers to the coal that needs to be mined under buildings such as towns, industrial buildings, and railways. Coal mining under buildings such as buildings, railways, and water bodies is a special mining, referred to as "three-under" coal mining. In order to protect the ecological environment of buildings such as cities and towns, industrial buildings, and railways, and prevent the roof from sinking in the "three down" goafs, the filling method is generally used to manage the roof, and the gangue from underground excavation is filled into the goaf. [0003] From the perspective of filling practice in my country, the filling methods include lane column method and long wall filling method; from the filling material...

AI Technical Summary

Problems solved by technology

For example, the roadway column filling method cannot form a full negative pressure ventilation system with poor safety and low coal recovery rate; when filling and mining the long-arm working face, filling and production interact with each other, filling materials are insufficient, slurry running threatens the working face, and fully mechanized filling is occupied There are many supporting equipment and low production efficiency

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