CN-122014284-A - Roof sinking treatment support system and method for gob-side entry retaining of large mining height working face

Abstract

The invention discloses a large mining height working face gob-side entry retaining roof sinking treatment support system, which is a system for multi-azimuth combined support by advanced working face reinforcement support, space reinforcement support to be poured and lag temporary reinforcement support. This a support system is administered in sinking of gob-side entry retaining roof for big mining height working face, pertinence is to gob-side entry retaining implementation process, when roof subsidence appears, administer the roof of sinking the tunnel, reduce the influence that roof subsidence produced production and safety to the mine, ensure mine safety in production.

Inventors

• LI HOUCHANG
• WU JINGYU
• LEI PINGBO
• LEI HUAYU
• DONG YANWEI
• LI YONGHUI

Assignees

• 国能包头能源有限责任公司
• 国能包头能源有限责任公司万利一矿
• 陕西开拓新矿业工程有限公司

Dates

Publication Date

20260512

Application Date

20260410

Claims (10)

1. 1. The system is characterized by being a multi-azimuth combined support system formed by reinforcing supports of an advanced working face, reinforcing supports of a space to be poured and temporary delayed reinforcing supports.
2. 2. The support system for gob-side entry retaining roof sinking treatment of the large mining height working face according to claim 1, wherein grouting anchor cables are used for grouting support of the tunnel roof for advanced working face reinforcement support.
3. 3. The roof sinking treatment support system for gob-side entry retaining on a large mining height according to claim 2, wherein the grouting anchor cables are arranged vertically to the roof, the first row is 500-700mm away from the primary mining slope, and the second row is 1800-2200mm away from the first row of grouting anchor cables.
4. 4. The support system for the gob-side entry retaining roof sinking treatment of the large mining height working face is characterized in that grouting anchor cables have diameters of 21.8mm and lengths of 9300mm and row pitches of 2000mm.
5. 5. The roof sinking control support system for gob-side entry retaining on a large mining height according to claim 4, wherein the grouting material is silicate modified polyurethane material for reinforcing coal rock of a coal mine.
6. 6. The support system for gob-side entry retaining roof sinking treatment of a large mining height working face according to claim 5, wherein the space reinforcing support to be poured comprises an anchor rod and a prestressed anchor cable hanging steel girder support.
7. 7. The roof sinking treatment support system for the gob-side entry retaining of the large mining height working face according to claim 6 is characterized in that the diameter of an anchor rod is 22mm, the length of the anchor rod is 2500mm, the diameter of the anchor rod is 21.8mm, the length of the anchor rod is 12000mm, the length of a steel beam is 3200mm, the width of the steel beam is 300mm, the thickness of the steel beam is 10mm, and the row spacing is 2000mm.
8. 8. The roof sinking treatment support system for gob-side entry retaining on a large mining height according to claim 7, wherein the temporary delayed reinforcement support comprises a unit bracket and a U-shaped steel canopy frame cooperatively reinforced temporary support.
9. 9. The support system for gob-side entry retaining roof sinking treatment of the large mining height working face is characterized in that unit brackets are 650mm away from the entry retaining wall body and are spaced by 3000mm along the longitudinal direction of the wall body, U-shaped steel sheds are erected among the unit brackets, 36# U-shaped steel is adopted, and the row spacing is 3000mm.
10. 10. The method for controlling and supporting the sinking of the roof of the gob-side entry retaining on the working face with large mining height is characterized by comprising the following steps of; Step 1, grouting anchor cables are arranged in grouting anchor cable arranging areas; Step 2, grouting after grouting anchor cable is set; Step 3, an anchor rod and a prestressed anchor cable are arranged behind the end bracket of the working face and in front of the die hanging device, and then a steel beam is sleeved and fixed; step 4, after the casting of the wall body of the retaining lane is finished and the strength of the wall body material can meet the requirement of demolding, moving the unit bracket to the vicinity of the wall body of the retaining lane for supporting and pressing the top after the demolding of the mold hanging device is advanced; step 5, after the unit brackets are supported, a U-shaped steel canopy frame is additionally arranged between the two unit brackets; And 6, repeating the steps 1-5 until the roof subsidence is found to meet the requirement by the roof subsidence monitoring means.

Description

Roof sinking treatment support system and method for gob-side entry retaining of large mining height working face Technical Field The invention belongs to the technical field of coal mining support, and particularly relates to a support system for controlling sinking of a gob-side entry retaining roof of a large mining height working face and a support method for controlling sinking of the gob-side entry retaining roof of the large mining height working face. Background In order to improve the recovery rate of coal resources and prolong the service life of mines, gob-side entry retaining technology is popularized and applied to a plurality of mines in China. The application of the gob-side entry retaining technology recovers the traditional entry-protecting coal pillars, improves the recovery rate of mine coal resources, reduces the tunneling quantity of the tunnel, relieves the situation of continuous shortage of mining, and has good technical and economic benefits. The flexible mold gob-side entry retaining technology is wider in application range as one of the main gob-side entry retaining technologies, and is applied to mines with different geological conditions and different mining heights. In the application process of the flexible mold gob-side entry retaining technology, particularly on large mining height working surfaces, roof sinking of roof plates of the entry retaining roadway can sometimes occur to different degrees due to the change of geological conditions and the influence of mining. The section of the tunnel that will result after the tunnel roof subsides diminishes, will hinder transportation and pedestrian's the traffic of material after the section of the tunnel diminishes, hinder mine ventilation, produce very big influence to production and the safety of mine. Therefore, in order to ensure the production safety of mines, the sinking condition of the roof of the large-mining-height entry retaining roadway needs to be treated in a targeted manner. Disclosure of Invention The invention aims to provide a gob-side entry retaining roof sinking treatment support system for a large mining height working face, which is used for treating the roof of a sinking roadway when the roof is sinking in a gob-side entry retaining implementation process in a targeted manner, reducing the influence of the roof sinking on the production and safety of a mine and ensuring the safe production of the mine. In order to achieve the purpose, the technical scheme adopted by the invention is that the system for controlling the sinking of the roof of the gob-side entry retaining on the working face with large mining height is a system which is formed by multi-azimuth combined support of advanced working face reinforcement support, space reinforcement support to be poured and lag temporary reinforcement support. The technical scheme of the invention also has the following characteristics: Grouting supporting is carried out on the tunnel roof by adopting grouting anchor cables for the advanced working face reinforcing supporting. The grouting anchor cable is arranged vertically to the top plate, the first row is 500-700mm away from the primary mining side, and the second row is 1800-2200mm away from the first row of grouting anchor cable. Grouting anchor cable diameter 21.8mm, length 9300mm, row spacing 2000mm. The grouting material adopts silicate modified polyurethane material for reinforcing coal rock in coal mine. The space reinforcing support to be poured comprises an anchor rod and a prestressed anchor cable hanging steel girder support. The diameter of the anchor rod is 22mm, and the length is 2500mm; the diameter of the anchor cable is 21.8mm, and the length is 12000mm; the length of the steel beam is 3200mm, the width is 300mm, the thickness is 10mm, and the row spacing is 2000mm. The lag temporary reinforcement support comprises a unit support and a U-shaped steel shed frame which cooperate to reinforce the temporary support. The unit brackets are 650mm away from the roadway retaining wall body and are spaced by 3000mm along the longitudinal direction of the wall body; and U-shaped steel sheds are erected among the unit bracket frames, 36# U-shaped steel is adopted, and the row spacing is 3000mm. The second purpose of the invention is to provide a method for controlling and supporting the sinking of the roof of the gob-side entry retaining on the working face with large mining height, which is aimed at controlling the roof of the sinking roadway when the sinking of the roof occurs in the gob-side entry retaining implementation process, reducing the influence of the sinking of the roof on the production and safety of mines and ensuring the safety production of the mines. In order to achieve the aim, the technical scheme adopted by the invention is that the method for controlling and supporting the sinking of the roof of the gob-side entry retaining on the working face with large mining height is implemented a