Supporting and protecting device for gob-side entry retaining of ultra-high roadway

Abstract

The invention discloses a supporting and protecting device for gob-side entry retaining of an ultra-high roadway. The ultra-high roadway includes a roadway and a front undercutting roadway, negative coal wall spalling is arranged on one sides of the roadway and the front undercutting roadway, and a mined-out area, a working surface and positive coal wall spalling are sequentially arranged on the other sides of the roadway and the front undercutting roadway. Steel pipe concrete pillars and stacking brackets for supporting and protecting are arranged at intervals in the roadway. Transverse strutsteel columns for resisting roadway lateral pressure are arranged on the steel pipe concrete pillars at the mined-out area in the roadway. A roadway top plate is provided with reinforced anchor cables for advance pre-reinforcement. The device has the advantages of reliable support and protection, simple operation, cost saving, improvement of coal recovery rate and improvement of the economic benefit of coal mine, and the application of the ultra-high gob-side entry retaining can reduce the excavation amount of the roadway and alleviate the continuous tension in the mine.

Description

technical field [0001] The invention belongs to the technical field of mine engineering, and in particular relates to a supporting device for gob-side retaining in super-high roadways. Background technique [0002] With the rapid development of mining technology and support system, gobside entry retention has been widely used and achieved good application results. At present, the application of gob-side entry retention is mainly concentrated in the roadway below 4m, and it has not been involved in the roadway above 4m. [0003] There are a large number of extra-thick coal seams in China, and now there are two types of mining methods: large mining height and comprehensive mechanized top-coal caving mining. In large mining height mining, because the roadway height is consistent with the recovery height, gob-side retaining technology is seldom used. However, in the top-coal caving mining technology, the coal seam is often soft, and only the method of "excavation on the top of...

AI Technical Summary

Problems solved by technology

[0005] 1. The application is mainly limited to roadways below 4m, and rarely involved in roadways above 4m;

[0006] 2. When the height of the mining roadway exceeds 4m, the excavation workload is heavy, the support is difficult, and the excavation speed is slow;

[0007] 3. Double-lane excavation is the most used now, and coal pillars will be left between the roadways and roadways, resulting in waste of resources;

[0008] 4. The coal pillars left behind after mining will adversely affect the later mining, which is easy to form stress concentration, and at the same time, the cracks in the overlying rock cannot be closed, resulting in increased mine water gushing

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