Method for rapidly installing flexible filling bag in gob-side entry retaining of large mining height working face

Abstract

The invention discloses a method for rapidly installing a flexible filling bag for gob-side entry retaining of a large mining height working face. The method comprises the following steps of determining the size of the flexible filling bag, manufacturing the flexible filling bag, fixing a reinforcing mesh, hanging the flexible filling bag, fixing an opposite-pulling anchor rod and installing a protective template. According to the method, through structure innovation of the flexible filling bag, process innovation of installing and fixing the opposite-pulling anchor rods, collaborative construction method innovation and formwork protection mode innovation, the efficiency of rapidly installing the flexible filling bag on the large-mining-height working face with the mining height larger than 4 m is improved by 50% or above. Compared with the prior art, the device has the characteristics that personnel can enter the filling bag to work, and the opposite-pulling anchor rod is accurately positioned, so that the installation efficiency of the opposite-pulling anchor rod is improved by more than 50%; the high-altitude falling risk of the working platform is reduced, a waterproof zipper is embedded in the filling bag, safety is improved, and wide application prospects and market value are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of gob-side lane retaining in coal mine pillarless mining and coal mine lane support, and in particular to a method for quickly installing flexible filling bags in a gob-side lane retaining in a large mining height working face. Background Art

[0002] Many coal-producing countries around the world have adopted gob-side entry retention technology to reduce tunneling volume, increase coal production continuity, and improve mine economic efficiency. The United Kingdom, Germany, Poland, Russia, and China are among the countries most frequently using this technology. With my country's rapid economic development, coal demand and production capacity have grown rapidly. While my country boasts abundant coal resources, the occurrence conditions are highly complex. Over 95% of coal production is produced through underground mining. Underground mining requires the excavation of numerous underground tunnels. According to statistics, as of the end of 2020, my country's total annual tunneling progress reached approximately 15,000 km, of which mining tunnels accounted for over 70%. Most mining tunnels have long been maintained using a protective coal pillar system: a narrow 5-10 meter pillar or a 15-30 meter wide pillar is left between the working face. This prevents air leakage between the working face and the adjacent goaf, which could cause spontaneous combustion in the goaf, while also addressing the impact of mine pressure at the working face.

[0003] The reserved protective coal pillars have caused a large amount of coal loss. The retention of the protective coal pillars not only leads to problems such as reduced coal recovery rate and difficulty in tunnel maintenance, but also the wider section of the coal pillars will form a stress concentration area after the working face is mined, making it difficult to maintain the bottom rock tunnel and the lower coal mining tunnel arranged below the coal pillars, and sometimes even leading to the dynamic phenomenon of coal and gas outburst.

[0004] In this context, as the country vigorously promotes green coal mining, the technology of gob-side entry retention with no-pillar mining has been valued and introduced by more and more coal mining companies. Currently, the method of gob-side entry retention with side filling is widely used in my country. This method is applied to flexible filling bags. For large mining height working faces, the flexible filling bags are relatively large in height and width. Traditional flexible filling bag installation has the following problems: 1. External anchor bolts are required, the operating space is limited, the efficiency is low, and there are risks of high-altitude operations; 2. Personnel cannot enter the flexible filling bag to work, and the positioning accuracy of the tension anchor is poor, which can easily lead to uneven force on the filling body; 3. The lack of a construction platform makes it difficult for multiple people to work together, which prolongs the time for hanging flexible filling bags. Summary of the Invention

[0005] In response to the above-mentioned technical deficiencies, the purpose of the present invention is to provide a method for quickly installing flexible filling bags along the goaf of a large mining height working face. The method is suitable for the rapid installation of flexible filling bags in the goaf-retaining process of filling the goaf alongside the goaf of a large mining height working face with a mining height greater than 4m. The rapid installation of the flexible filling bags is achieved through the built-in waterproof zipper and the personnel-accessible design.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a method for quickly installing a flexible filling bag along a goaf-retained lane in a large mining height working face. The flexible filling bag comprises a bag body, and a plurality of evenly distributed tension anchor cuffs are symmetrically provided on two sides of the bag body that are in contact with the lane. An openable and closable channel is provided on the end surface of the bag body along the lane direction. The circumferential edge of the top of the bag body is provided with a plurality of evenly distributed hanging points and injection holes, and the injection holes can also be used as exhaust holes. The method specifically comprises the following steps: S1: Determine the size of the flexible filling bag; determine the size of the flexible filling bag based on the advancement of the working face, mining height and filling width; S2: Prepare a flexible filling bag; prepare the flexible filling bag and reserve eyelets for the tension anchor rods, cuffs and an openable and closable channel at a preset position on the bag body; S3: Fix the steel mesh and hang the flexible filling bag; fix the steel mesh on both sides of the filling space so that it covers the entire section from the top plate to the bottom plate, then fix the hanging point on the top of the flexible filling bag to the top plate mesh and install the first row of tension anchor rods; S4: Building an internal working platform; construction workers enter the flexible filling bag through the openable and closable passage and build a working platform in the middle of the flexible filling bag in the height direction; S5: Collaboratively fix the tension anchor rods; the person inside the flexible filling bag locates the position of the tension anchor rods through the cuffs, while the person outside passes the tension anchor rods from one side of the flexible filling bag to the other side from top to bottom, and uses cable ties to fix the cuffs of the tension anchor rods to prevent slurry leakage; S6: Install the ladder beam and anchors; install the ladder beam at the tension anchor position outside the steel mesh, and then install the anchor tray; S7: Install the guard plate; fix the guard plate on both sides and ends of the flexible filling bag to complete the installation.

[0007] Preferably, in step S1 , the size of the flexible filling bag reserves a margin of 200-400 mm in the length direction, a margin of 100-300 mm in the width direction, and a margin of 300-500 mm in the height direction.

[0008] Preferably, in step S2, the openable and closable channel is a waterproof zipper embedded in the end of the flexible filling bag at a position 300~600mm away from the bottom plate, with a length of 0.8~1.5m; a sealing strip with a width of 200~500mm is provided on the inside of the waterproof zipper, and the zipper of the waterproof zipper is located in the middle of the sealing strip.

[0009] Preferably, in step S2, high-strength air duct coated cloth that complies with GB / T 20105-2006 standard is used to make the flexible filling bag. When making the flexible filling bag, hanging points are processed every 600-800 mm on the top of the flexible filling bag.

[0010] Preferably, in step S2, the cuff has a diameter of 50-100 mm and a length of 100-200 mm; and the four corners of the top of the flexible filling bag are respectively provided with filling holes with a diameter of 80-150 mm and a length of 500-600 mm.

[0011] Preferably, in step S3, the steel mesh is made by spot welding round steel with a diameter of 6-6.5 mm, the mesh is 100×100 mm, the steel mesh is pressed 100-300 mm, and is connected with double-breasted wire ties.

[0012] Preferably, in step S4, the working platform is set up as follows: two tension anchor rods are fixed on the steel mesh on both sides of the flexible filling bag at intervals of 300~800mm as support members, and wooden boards are laid above the two tension anchor rods to form a platform, and the platform width is ≥400mm; the specifications of the wooden boards are 150~400mm wide, 30~50mm thick, and 1.5~3m long.

[0013] Preferably, in step S7, the guard plate is made of round steel spot welding, with a grid size of 100×100 mm and a single block height of 1~1.5 m; the guard plates on both sides are fixed by large trays and nuts at the ends of the tension anchor rods, and the end guard plates are fixed by single pillars or telescopic jacks.

[0014] Preferably, in step S6, the ladder beam is processed from round steel with a diameter of 14 mm, and the eyelet spacing matches the tension anchor rod.

[0015] The beneficial effects of the present invention are: 1. This invention optimizes the entire installation process of flexible filling bags through the innovative combination of a built-in waterproof zipper, an internal working platform, and internal and external collaborative construction, improving the fixing efficiency of tension anchors by more than 50%. The formwork uses a round steel spot-welded structure to replace traditional single pillars, shortening installation time and the overall construction period, greatly improving construction efficiency.

[0016] 2. The bag adopts an accessible filling bag design. Personnel enter the interior through a waterproof zipper at the end, and a standardized working platform is built in the middle of the bag to completely avoid the risk of falling from heights. A sealing strip is set on the inside of the waterproof zipper, and the anchor rod cuff is fixed with a tie to eliminate the underground safety hazards caused by slurry leakage.

[0017] 3. Internal personnel directly locate the eyelet of the tension anchor through the reserved cuffs, and the external rod-piercing work cooperates, which greatly reduces the position error of the tension anchor and avoids uneven force on the filling body.

[0018] 4. Supports working faces with a mining height of >4m. The height of the working platform is adjustable to meet the operating needs of different construction workers. The length of the guard plate is synchronized with the advancement of the working face. The ladder beam eye distance is customized according to the anchor bolt spacing to achieve rapid batch construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a flexible filling bag provided in an embodiment of the present invention; Figure 2 Three views of a flexible filling bag provided by an embodiment of the present invention; Figure 3 A schematic diagram of the installation of a working platform within a flexible filling bag provided by an embodiment of the present invention; Figure 4 A schematic diagram of the template structure provided by an embodiment of the present invention; Figure 5 A schematic diagram of the steel mesh structure provided by an embodiment of the present invention; Figure 6 A schematic diagram of the round steel ladder beam structure provided in an embodiment of the present invention; Figure 7 This is a flow chart of the rapid installation of a flexible filling bag provided by an embodiment of the present invention.

[0021] Description of reference numerals: 1- grouting hole; 2- hanging point; 3- cuff; 4- waterproof zipper; 5- working platform; 6- steel mesh; 7- flexible filling bag; 8- tension anchor rod; 9- formwork; 10- ladder beam; 11- upper filling body. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figures 1 to 2 As shown, this embodiment provides a flexible filling bag for retaining lanes along a large mining height working face, the flexible filling bag comprises a bag body, a plurality of evenly distributed tension anchor cuffs 3 are symmetrically provided on the two sides of the bag body that fit the lane, an openable and closable channel is provided on the end face of the bag body along the lane direction, and a plurality of evenly distributed hanging points 2 and injection holes 1 are provided on the circumferential edge of the top of the bag body.

[0024] See also Figure 3-Figure 7 Based on the above-mentioned flexible filling bags, this embodiment also provides a method for quickly installing flexible filling bags along gob-side entry retention in a large mining height working face, comprising the following steps: S1: Determine the size of the flexible filling bag; determine the size of the flexible filling bag based on the advancement of the working face, mining height and filling width; the size of the flexible filling bag should reserve a surplus of 200~400mm in the length direction, 100~300mm in the width direction, and 300~500mm in the height direction. S2: Prepare the flexible filling bag 7; use high-strength air duct coated cloth that complies with the GB / T 20105-2006 standard to make the flexible filling bag, and reserve eyelets for the tension anchor rods 8, cuffs 3, and an openable and closable channel at the preset position of the bag body; when making the flexible filling bag, process hanging points at every 600-800 mm on the top of the bag.

[0025] The openable and closable channel is a waterproof zipper embedded in the end of the flexible filling bag at a position 300~600mm away from the bottom plate, with a length of 0.8~1.5m; a 200~500mm sealing strip is provided on the inside of the waterproof zipper 4, and the zipper of the waterproof zipper is located in the middle of the sealing strip.

[0026] The cuff has a diameter of 50-100 mm and a length of 100-200 mm; the four corners of the top of the flexible filling bag are respectively provided with pouring holes with a diameter of 80-150 mm and a length of 500-600 mm.

[0027] S3: Fix the steel mesh 6 and hang the flexible filling bag; according to the position of the previous filling body 11, quickly locate the position to be filled this time, start installing the flexible filling bag, fix the steel mesh on both sides of the filling space, so that it covers the entire cross-section from the top plate to the bottom plate, then fix the hanging point at the top of the flexible filling bag to the top plate mesh, and pass the first row of tension anchors; the hanging points are spaced 600-800mm apart. When hanging the flexible filling bag 7, first install the top row of tension anchors 8 in the corresponding position. Figure 7 Middle ab, Figure 7 Middle a is a schematic diagram of installing the steel mesh on both sides. Figure 7 Middle b is a schematic diagram of hanging flexible filling bags; The steel mesh is made of spot-welded round steel with a diameter of 6-6.5mm. The mesh is 100×100mm, the steel mesh is pressed at a length of 100~300mm, and is connected with double-breasted wire.

[0028] S4: Build an internal working platform 5; the construction workers enter the flexible filling bag through the openable and closable passage and set up a working platform in the middle of the height direction; see Figure 7 Figure c is a schematic diagram of building a work platform; The working platform is set up as follows: two tension anchor rods are fixed on the steel mesh on both sides of the flexible filling bag at intervals of 300~800mm as support members, and wooden boards are laid above the two tension anchor rods to form a platform with a width of ≥400mm; the specifications of the wooden boards are 150~400mm wide, 30~50mm thick, and 1.5~3m long.

[0029] S5: Collaboratively fix the tension anchor rods; the person inside the flexible filling bag locates the position of the tension anchor rods through the cuffs, while the person outside passes the tension anchor rods from one side of the flexible filling bag to the other side from top to bottom, and uses cable ties to fix the cuffs of the tension anchor rods to prevent slurry leakage; Figure 7 Figure d in the middle is a schematic diagram of installing tension anchor rods. S6: Install the ladder beam and anchors; install the ladder beam 10 at the tension anchor position outside the steel mesh, and then install the anchor tray; the ladder beam is made of 14mm diameter round steel, and the eyelet spacing matches the tension anchor.

[0030] S7: See Figure 7 In step e, the guard plate 9 is installed; the guard plate is fixed on both sides and the end of the flexible filling bag to complete the installation.

[0031] The guard plate is made of round steel spot welding, with a grid size of 100×100mm and a single block height of 1~1.5m; the guard plates on both sides are fixed by large trays and nuts at the ends of the tension anchor rods, and the end guard plates are fixed by single pillars or telescopic jacks.

[0032] This embodiment has the following advantages: 1. Innovation in the structure of flexible filling bags Long zipper design at the end: The end of the flexible filling bag is embedded with a waterproof zipper with a length of 0.8~1.5m, which allows personnel to enter the interior for operation, greatly improving the time efficiency of fixing the tension anchor rods and breaking through the limitations of traditional external construction.

[0033] 2. Installation process innovation Hanging flexible filling bag + working platform: (1) After the flexible filling bag is hung for the first time, the top anchor rod should be fixed first, and the flexible filling bag will be initially formed after it is hung down; (2) Fix tension anchor rods at intervals of 300 to 800 mm in the middle of the flexible filling bag as the support structure of the working platform, and build the working platform above the tension anchor rods; (3) Common wood planks are used as the main material for building the working platform to achieve safe and efficient high-altitude operations.

[0034] 3. Innovation in collaborative construction methods Synchronous operation inside and outside: The operator enters the flexible filling bag through the waterproof zipper embedded in the end. The operator inside the flexible filling bag quickly and accurately locates the tension anchor through the reserved cuffs of the tension anchor, and the operator outside installs the tension anchor from top to bottom, reducing positioning error and rework rate, and greatly improving the efficiency of fixing the tension anchor.

[0035] 4. Innovation in mold protection methods The use of formwork panels processed from large-diameter round steel instead of traditional single-pillar formwork reduces the labor intensity of operators and greatly shortens the time for installing the formwork device.

[0036] This method enables the rapid installation of flexible filling bags in mining faces with a mining height exceeding 4 meters, increasing efficiency by over 50%. Compared to existing technologies, this method allows personnel to enter the filling bags and precisely position the tension anchors, increasing installation efficiency by over 50%. The working platform reduces the risk of falls from height, and the embedded waterproof zipper in the filling bags enhances safety, demonstrating broad application prospects and market value.

[0037] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for quickly installing flexible filling bags along gob-side entry in a large mining height working face, characterized in that: The flexible filling bag includes a bag body, and a plurality of evenly distributed tension anchor cuffs are symmetrically provided on two sides of the bag body that are in contact with the roadway. An openable and closable channel is provided on the end surface of the bag body along the roadway direction. The circumferential edge of the top of the bag body is provided with a plurality of evenly distributed hanging points and pouring holes. The method specifically includes: S1: Determine the size of the flexible filling bag; determine the size of the flexible filling bag based on the advancement of the working face, mining height and filling width; S2: Prepare a flexible filling bag; prepare the flexible filling bag and reserve eyelets for the tension anchor rods, cuffs and an openable and closable channel at a preset position on the bag body; S3: Fix the steel mesh and hang the flexible filling bag; fix the steel mesh on both sides of the filling space so that it covers the entire section from the top plate to the bottom plate, then fix the hanging point on the top of the flexible filling bag to the top plate mesh and install the first row of tension anchor rods; S4: Building an internal working platform; construction workers enter the flexible filling bag through the openable and closable passage and build a working platform in the middle of the flexible filling bag in the height direction; S5: Collaboratively fix the tension anchor rods; the person inside the flexible filling bag locates the position of the tension anchor rods through the cuffs, while the person outside passes the tension anchor rods from one side of the flexible filling bag to the other side from top to bottom, and uses cable ties to fix the cuffs of the tension anchor rods to prevent slurry leakage; S6: Install the ladder beam and anchors; install the ladder beam at the tension anchor position outside the steel mesh, and then install the anchor tray; S7: Install the guard plate; fix the guard plate on both sides and ends of the flexible filling bag to complete the installation.

2. The method according to claim 1, characterized in that In step S1 , the size of the flexible filling bag reserves a margin of 200-400 mm in the length direction, a margin of 100-300 mm in the width direction, and a margin of 300-500 mm in the height direction.

3. The method according to claim 2, characterized in that In step S2, the openable and closable channel is a waterproof zipper embedded in the flexible filling bag at a position 300~600mm from the end to the bottom plate, with a length of 0.8~1.5m; a 200~500mm sealing strip is provided on the inside of the waterproof zipper, and the zipper of the waterproof zipper is located in the middle of the sealing strip.

4. The method according to claim 1, wherein In step S2, a high-strength air duct coated cloth that complies with the GB / T 20105-2006 standard is used to make a flexible filling bag. When making the flexible filling bag, hanging points are processed at intervals of 400 to 800 mm on the top of the flexible filling bag.

5. The method according to claim 1, wherein In step S2, the cuff has a diameter of 50-100 mm and a length of 100-200 mm; the four corners of the top of the flexible filling bag are respectively provided with filling holes with a diameter of 80-150 mm and a length of 300-600 mm.

6. The method according to claim 1, characterized in that In step S3, the steel mesh is made by spot welding round steel with a diameter of 6-6.5 mm, the mesh is 100×100 mm, the steel mesh is pressed 100~300 mm, and is connected with double-breasted wire.

7. The method according to claim 1, characterized in that In step S4, the working platform is set up as follows: two tension anchor rods are fixed on the steel mesh on both sides of the flexible filling bag at intervals of 300~800mm as support members, and wooden boards are laid above the two tension anchor rods to form a platform with a width of ≥400mm; the specifications of the wooden boards are 150~400mm wide, 30~50mm thick, and 1.5~3m long.

8. The method according to claim 1, characterized in that In step S7, the guard plate is made of round steel spot welding, with a grid size of 100×100 mm and a single block height of 1~1.5 m; the guard plates on both sides are fixed by large trays and nuts at the ends of the tension anchor rods, and the end guard plates are fixed by single pillars or telescopic jacks.

9. The method according to claim 1, characterized in that The ladder beam is made of 14mm diameter round steel, and the eyelet spacing matches the tension anchor rods.

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