Gob-side entry retaining process for solid filling working face

Abstract

The invention discloses a gob-side entry retaining process for a solid filling working face, which comprises the following steps: arranging two rows of single hydraulic props in a track crossheading along the trend, and supporting and hinging a top beam for supporting; after coal cutting and support moving are carried out on the working face, single hydraulic props are erected between a rear top beam of the support and a roadside support body, and a top plate is supported through short anchor rods; a [-shaped frame is arranged along the front side of the working face, a mold bag is fixed in the frame, and a hydraulic prop on the goaf side is withdrawn; the mold bags are filled through the cemented filling pipeline and solidified to form a filling body, and the frame is moved and poured once. A supporting system is formed beside the roadway, deformation and movement of the top plate are effectively resisted, and the stability of the gob-side entry retaining is enhanced; a plurality of supporting structures are matched, so that the stability of a coal body structure during excavation of gob-side entry retaining operation is improved; the safety of a roadway can be improved, the service life of the roadway can be prolonged, and normal production of a mine is ensured; and gob-side entry retaining of coal pillar filling mining is realized.

Description

Technical Field

[0001] The invention relates to the field of support technology for coal resource exploitation, and more specifically to a solid filling working face gob-side lane retaining technology. Background Art

[0002] In recent years, with the gradual depletion of coal resources and the enhancement of environmental protection awareness, solid filling technology has been widely used. This technology can effectively reduce the impact of coal mining on the geological environment, while improving the safety and economic benefits of the mine. In the process of coal filling mining, a coal pillar of about 20m is usually required between the two working faces of the upper and lower sections, which occupies a certain amount of mineral resources, resulting in a waste of resources, affecting the progress and efficiency of coal mining, and increasing production costs. Therefore, coal pillar-free gob-side entry retention has been valued in practical applications.

[0003] The gob-side tunneling technology can reduce tunnel excavation volume, save excavation costs, ease joint tension, maximize resource recovery, and extend the life of the mine. It has significant economic and social benefits and has a strong value for use and promotion. However, this method is difficult to construct and has high costs, which may lead to a decrease in tunnel stability and increase the safety risk of the mine.

[0004] In view of the above technical problems, it is necessary to research and develop a technology for retaining lanes along the goaf in a solid filling working face. Summary of the invention

[0005] The purpose of the present invention is to address the problems existing in the prior art and to provide a solid filling working face goaf-retaining lane technology that is simple in structure, safe and efficient. The technology pours along the front wall of the working face and uses a frame and a filling mold bag to cast a cemented filling body, thereby improving the stability of the lane and realizing coal pillar filling mining and goaf-retaining lane technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a solid filling working face gob-side entry retaining process, suitable for gob-side entry retaining in non-coal pillar filling mining, comprising the following steps:

[0007] S1. Use movable filling hydraulic supports to pre-support the goaf area, install two rows of single hydraulic props along the track groove of the tunnel, and support the mine tunnel roof with hinged top beams above them;

[0008] S2. Two additional single hydraulic props are set behind the filling hydraulic support and corresponding to the hinged top beam, and short anchor rods are used to further support the tunnel roof;

[0009] S3. Vertically install a "C"-shaped frame between two of the newly added single hydraulic props corresponding to two articulated roof beams on one side. The short anchor bolt is located inside the "C"-shaped frame. Embed a filling mold bag inside the "C"-shaped frame and fix the edges. Inflate the inside of the filling mold bag to make it bulge and fully expand. Withdraw the two newly added single hydraulic props in the goaf area. Install tension bolts through the filling mold bag and the "C"-shaped frame.

[0010] S4. Before processing the filling retaining wall structure, it is necessary to repair the filling equipment, prepare sufficient filling materials, and make slurry of the cemented filling materials. Use a self-propelled gangue transfer machine and a bottom discharge conveyor to cooperate to transport the filling materials into the roadway. After the personnel in the filling area have conducted a comprehensive inspection and are qualified, send a signal to the pump station to start making slurry. The pump station staff add materials and pre-stir in the mixing barrel. After stirring is completed, start the grouting pump. After the personnel in the filling area observe that the slurry is qualified, fill the cemented filling materials into the filling mold bag through the cemented filling pipeline.

[0011] S5. After the filling mold bag is filled and contacts the roof, take out the cemented filling pipeline from the filling mold bag and seal the pouring port. After the cemented filling materials solidify, a cemented filling body is formed. Tighten the nuts of the tension bolts.

[0012] S6. Use the filling gangue to stack a gangue filling body in the gob area beside the roadway, and the gangue filling body is set closely against the cemented filling body until it is flush with the end of the outermost cemented filling body.

[0013] S7. The scraper conveyor intermittently excavates close to the coal body inside the mine. The cut coal blocks are output and a new goaf area is formed in the gob area. Cut coal and move the support in the working face. After the support moving is completed, enter S8.

[0014] S8. Move the filling hydraulic support to support the new goaf area, and add a set of support structures of single hydraulic props and articulated roof beams in the direction of support moving. And cycle the process of S2 - S7. Continue to pour the cemented filling body in the area to be filled inside the newly added frame, and stack the gangue filling body outside it to form a filling retaining wall structure.

[0015] Preferably, in S1, the distance between two adjacent rows of the single hydraulic props matches the width of the "C"-shaped frame.

[0016] One row of single hydraulic props is set closely against the cemented filling body beside the roadway, and the other row of single hydraulic props is close to the roadway wall on the side of the track gateway.

[0017] Preferably, the two bottom ends of the articulated roof beam are respectively articulated with the single hydraulic props on both sides through two hinges to support the roof of the mine roadway.

[0018] Preferably, in S2, when using short bolts to support the roof, two short bolts are arranged along the inner side of the long side of the "C"-shaped frame. The distance between the two short bolts is equal to one-third of the length value of the "C"-shaped frame, and the two short bolts are axially symmetrically distributed about the central axis of the "C"-shaped frame.

[0019] Preferably, the filling mold bag is in a cuboid structure in a fully unfolded state, and an accommodation cavity is provided inside it for accommodating the cemented filling body; a perfusion port is penetrated through the upper part of the filling mold bag for filling the cemented filling material into the filling mold bag;

[0020] Vertical flanges are installed on all four vertical sides of the filling mold bag, and the four vertical flanges are parallelly distributed. A middle flange is installed between two adjacent vertical flanges through a flange sleeve.

[0021] Preferably, the middle flange is arranged in a fitting manner with the outer wall of the filling mold bag, and the number of middle flanges on each filling mold bag is set to two, and the two middle flanges are parallelly distributed and are perpendicular to the vertical flanges.

[0022] Preferably, steel wires are sleeved on both the middle flange and the vertical flange, and iron wires are wound around the outer sides of the middle flange and the vertical flange for fixing the steel wires sleeved in the middle flange and the vertical flange.

[0023] Preferably, a plurality of anchor bolt holes are correspondingly distributed on the opposite two side walls of the filling mold bag. A sealing transition sleeve is connected between two corresponding anchor bolt holes, and a tension anchor bolt is arranged inside the sealing transition sleeve. Nuts are connected to both ends of the tension anchor bolt, and adjacent two cemented filling bodies can be combined through the nuts and the tension anchor bolt.

[0024] Preferably, a hanging ring is arranged at the top of the filling mold bag for use in hoisting when arranging the filling mold bag;

[0025] The number of the hanging rings is at least four, and the multiple hanging rings are distributed in a rectangular array on both sides of the top of the filling mold bag.

[0026] Preferably, the number of the filling hydraulic supports is set to be multiple, and the multiple filling hydraulic supports are distributed in a strip shape, and the filling hydraulic supports corresponding to the gangue filling body and the cemented filling body do not move simultaneously.

[0027] The technical effects and advantages of the present invention:

[0028] 1. By pouring cemented filling bodies in the gob area beside the roadway and piling gob filling gangue on one side, a support system is formed to effectively resist the deformation and movement of the roof, thereby enhancing the stability of gob-side entry retaining; during the operation process, multi-structure supports such as filling hydraulic supports, "C"-shaped frames, single hydraulic props, articulated roof beams, and short anchor bolts are used to improve the stability of the coal body structure during the excavation of gob-side entry retaining operations; this can not only improve the safety of the roadway but also extend its service life, ensuring the normal production of the mine.

[0029] 2. Gob-side entry retaining can not only provide a convenient passage for subsequent mining operations but also facilitate production succession; through reasonable entry retaining planning, it can not only reduce coal resource waste, improve the economic benefits of the coal mine, but also help ensure the continuity and stability of production.

[0030] 3. In the gob-side entry retaining technology of the solid filling working face, the construction cemented filling technology is combined with the gob solid filling technology; it realizes gob-side entry retaining with coal pillar filling mining, having the advantages of simple structure and good social benefits; it is faster than the gob-side entry retaining method with gangue bags, greatly improving production efficiency and being convenient for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the filling structure distribution diagram of the gob-side entry retaining technology provided by the present invention.

[0032] Figure 2 It is the process flow chart of the gob filling heap forming control technology in the gob-side entry retaining technology provided by the present invention.

[0033] Figure 3 It is the partial structure reference diagram when installing the new frame in the gob-side entry retaining technology provided by the present invention.

[0034] Figure 4 It is the distribution structure schematic diagram of the gob filling gangue, cemented filling body, and articulated roof beam in the present invention.

[0035] Figure 5 It is the side view of the distribution structure of the "C"-shaped frame, new frame, and single hydraulic prop in the present invention.

[0036] Figure 6 It is the structure schematic diagram of the "C"-shaped frame (partially truncated) in the present invention.

[0037] Figure 7 It is the structure schematic diagram of the filling mold bag in the present invention.

[0038] In the figure:

[0039] 1. "C"-shaped frame; 2. Goaf backfill gangue; 3. Cemented filling body; 4. Area to be filled; 5. Newly added frame; 6. Single hydraulic prop; 7. Track gateway; 8. Iron wire; 9. Middle flange; 10. Pouring port; 11. Flange sleeve; 12. Vertical flange; 13. Anchor bolt hole; 14. Hanging ring; 15. Filling mold bag; 16. Articulated roof beam; 17. Short bolt; 18. Self-propelled gangue transfer machine; 19. Multi-hole bottom-discharge conveyor; 20. Filling hydraulic support; 21. Scraper conveyor; 22. Coal body. Detailed implementation manners

[0040] The following further describes an embodiment of the present invention in conjunction with the accompanying drawings:

[0041] Refer to the attached drawings of the specification Figure 1-7 As shown, a gob-side entry retaining technology for a solid filling working face, applicable to gob-side entry retaining in pillarless filling mining, includes the following steps:

[0042] S1. Use the movable filling hydraulic support 20 to pre-support the gob area. To improve the support strength of the roof of the mine roadway and provide a safe and reliable support and positioning function for the filling retaining wall structure, install two rows of single hydraulic props 6 along the track gateway 7 of the roadway in its running direction, and support the roof of the mine roadway by jacking an articulated roof beam 16 above them.

[0043] S2. Corresponding to the articulated roof beam 16 behind the filling hydraulic support 20, newly add two single hydraulic props 6. The newly added two single hydraulic props 6 are parallelly distributed with the two single hydraulic props 6 on one side of the corresponding two articulated roof beams 16 and are arranged in a rectangular array, and they are located between the articulated roof beam 16 and the roadside support body; and use short bolts 17 to further support the roof of the roadway. The number of short bolts 17 is at least set to two, as Figure 2 shown in (a);

[0044] S3. Vertically install a "C"-shaped frame 1 between the newly added two single hydraulic props 6 and the two single hydraulic props 6 corresponding to two articulated roof beams 16 on one side. The short bolts 17 are located inside the "C"-shaped frame 1. Embed a filling mold bag 15 inside the "C"-shaped frame 1 and fix the edge. Inflate the inside of the filling mold bag 15 to make it bulge and fully expand; Withdraw the newly added two single hydraulic props 6 in the gob area; as Figure 2 shown in (b); Install tension bolts through the filling mold bag 15 and the "C"-shaped frame 1.

[0045] S4. Before processing and filling the retaining wall structure, it is necessary to overhaul the filling equipment, prepare sufficient filling materials, and make slurry of the cemented filling materials. The self - moving gangue transfer machine 18 and the bottom - hole unloading conveyor 19 are used in cooperation to transport the filling materials into the roadway. After the personnel in the filling area have completed a comprehensive inspection and passed, they send a signal to the pump station to start making slurry. The pump station staff add materials and pre - stir in the mixing barrel. After mixing is completed, the grouting pump is started. After the personnel in the filling area observe that the slurry is qualified, the cemented filling materials are filled into the filling mold bag 15 through the cemented filling pipeline. In this embodiment, concrete is used, and the cemented filling pipeline is inserted into the filling mold bag 15 for filling. During the filling process, check the firmness of the single - hydraulic props 6 around the roof and the "C" - shaped frame 1. When looseness is found, additional props should be set up in a timely manner.

[0046] S5. After the filling mold bag 15 is filled and touches the roof, take out the cemented filling pipeline from the filling mold bag 15 and seal the pouring port 10. The way of tying the pouring port 10 tightly with a rope can be adopted. After the cemented filling materials solidify, a cemented filling body 3 is formed, as shown in Figure 2 (c). Tighten the nuts of the tension bolts.

[0047] S6. Use the coal gangue for filling to stack a gangue filling body 2 in the gob area beside the roadway, and the gangue filling body 2 is set closely against the cemented filling body 3 until it is flush with the end of the outermost cemented filling body 3.

[0048] S7. The scraper conveyor 21 intermittently excavates close to the coal body 22 inside the mine. The cut coal blocks are output and a new gob area is formed in the gob area. Cut coal and move the support in the working face; that is, the self - moving gangue transfer machine 18, the bottom - hole unloading conveyor 19, the filling hydraulic support 20, and the scraper conveyor 21 move with the working face after the coal body 22 is mined. After the support moving is completed, enter S8.

[0049] S8. Move the filling hydraulic support 20 to support the new gob area, add a new set of support structures of single - hydraulic props 6 and articulated roof beams 16 in the direction of support moving, and cycle the process of S2 - S7. Continue to pour the cemented filling body 3 in the待充填区域 4 in the newly added frame 5, and stack the gangue filling body 2 outside it in cooperation to form a filling retaining wall structure, as shown in Figure 2 (d).

[0050] Adopting the above - mentioned process can form a support system in the gob area inside the roadway, effectively resist the deformation and movement of the roof, thereby enhancing the stability of the gob - side entry retaining. This method can not only improve the safety of the roadway, but also extend its service life, ensuring the normal production of the mine.

[0051] Further, as a preferred embodiment of the present invention, in S1, the distance between two adjacent rows of single hydraulic props 6 matches the width of the "C"-shaped frame 1. In this embodiment, the "C"-shaped frame 1 is made of wood with a length and width specification of 3000 mm × 800 mm, that is, the distance between two adjacent rows of single hydraulic props 6 is also set to 800 mm;

[0052] One row of single hydraulic props 6 is arranged closely against the roadside cemented filling body 3, and the other row of single hydraulic props 6 is close to the roadway wall on the side of the track gateway 7.

[0053] Preferably, the bottoms of both ends of the articulated roof beam 16 are respectively hinged to the single hydraulic props 6 on both sides through two hinges, and the articulated roof beam 16 supports the top wall of the mine roadway.

[0054] Further, as a preferred embodiment of the present invention, in S2, when using short bolts 17 to support the roof, two short bolts 17 are arranged along the inner side of the long side of the "C"-shaped frame 1, and the distance between the two short bolts 17 is equal to one-third of the length value of the "C"-shaped frame 1. In this embodiment, the distance between the two short bolts 17 is set to 1000 mm, and the two short bolts 17 are axially symmetrically distributed about the central axis of the "C"-shaped frame 1.

[0055] Further, as a preferred embodiment of the present invention, the filling mold bag 15 is in a cuboid structure in a fully unfolded state, and an accommodation cavity is provided inside it for accommodating the cemented filling body 3; a filling port 10 is penetrated through the upper part of the filling mold bag 15 for filling the cemented filling material into the filling mold bag 15;

[0056] Vertical flanges 12 are installed on all four vertical sides of the filling mold bag 15, and the four vertical flanges 12 are parallelly distributed. A middle flange 9 is installed between two adjacent vertical flanges 12 through a flange sleeve 11.

[0057] Further, as a preferred embodiment of the present invention, the middle flange 9 is arranged in贴合 with the outer wall of the filling mold bag 15, and the number of middle flanges 9 on each filling mold bag 15 is set to two, and the two middle flanges 9 are parallelly distributed and are perpendicular to the vertical flanges 12.

[0058] Further, as a preferred embodiment of the present invention, steel wires are sleeved on both the middle flange 9 and the vertical flange 12, which helps to increase the tensile strength of the filling mold bag 15 and bear part of the lateral pressure of the unhardened cemented filling material, achieving the effects of balancing pressure and controlling thickness; and iron wires 8 are wound around the outer sides of the middle flange 9 and the vertical flange 12 for fixing the steel wires sleeved in the middle flange 9 and the vertical flange 12.

[0059] Further, as a preferred embodiment of the present invention, a plurality of anchor bolt holes 13 are provided on opposite side walls of the filling formwork bag 15 in a corresponding distribution. A sealing transition sleeve is connected between two corresponding anchor bolt holes 13. A tension anchor bolt is arranged inside the sealing transition sleeve. Nuts are connected to both ends of the tension anchor bolt. The adjacent two cemented filling bodies 3 can be combined by the nuts and the tension anchor bolt to realize the connection between the cemented filling body 3 and the "C"-shaped frame 1 and the integral setting of a plurality of cemented filling bodies 3, so as to increase the overall support strength of the filling retaining wall structure.

[0060] Further, as a preferred embodiment of the present invention, a hanging ring 14 is arranged at the top of the filling formwork bag 15 for use during hoisting when laying out the filling formwork bag 15;

[0061] The number of the hanging rings 14 is at least four, and the plurality of hanging rings 14 are distributed in a rectangular array on both sides of the top of the filling formwork bag 15.

[0062] Further, as a preferred embodiment of the present invention, the number of the filling hydraulic supports 20 is set to be multiple. The multiple filling hydraulic supports 20 are distributed in a strip shape, and the filling hydraulic supports 20 corresponding to the gangue filling body 2 and the cemented filling body 3 do not move simultaneously; specifically, in the gob-side entry retaining technology provided by the present invention, the cemented filling body 3 is poured first, and then the gangue filling body 2 is stacked. Before pouring the cemented filling body 3, the filling hydraulic support 20 located in front of the cemented filling body 3 is moved first, while the filling hydraulic support 20 located in front of the gangue filling body 2 remains stationary first. Before stacking the gangue filling body 2, the filling hydraulic support 20 correspondingly arranged in front of it is moved at this time.

[0063] Finally: The above are only preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solid filling working face gob-side entry retaining process, characterized in that: It includes the following steps: S1. Use a movable filling hydraulic support (20) to pre-support the goaf area. Install two rows of single hydraulic props (6) along the track gateway (7) of the roadway in the direction of its trend, and support the roof of the mine roadway by jacking an articulated roof beam (16) above them; S2. Correspondingly set two additional single hydraulic props (6) behind the filling hydraulic support (20) and opposite to the articulated roof beam (16), and further support the roof of the roadway with short anchor bolts (17); S3. Vertically install a "C"-shaped frame (1) between two of the single hydraulic props (6) corresponding to the two articulated roof beams (16) on one side among the two additional single hydraulic props (6). Embed a filling mold bag (15) inside the "C"-shaped frame (1) and fix the edges. Inflate the inside of the filling mold bag (15) to make it bulge and fully unfold; Withdraw the two additional single hydraulic props (6) in the goaf area; Pass through tension bolts on the filling mold bag (15) and the "C"-shaped frame (1); S4. Use a self-propelled gangue loader (18) and a bottom-discharge conveyor (19) to cooperate to convey filling materials into the roadway; Fill the filling mold bag (15) with cemented filling materials through the cemented filling pipeline; S5. After the filling mold bag (15) is filled and contacts the roof, take out the cemented filling pipeline from the filling mold bag (15), and seal the pouring port (10). After the cemented filling materials solidify, a cemented filling body (3) is formed; Tighten the nuts of the tension bolts; S6. Use filling coal gangue to pile up a gangue filling body (2) in the goaf beside the roadway, and the gangue filling body (2) is arranged closely against the cemented filling body (3) until it is flush with the end of the outermost cemented filling body (3); S7. The scraper conveyor (21) intermittently excavates close to the coal body (22) inside the mine. The cut coal blocks are output and a new goaf area is formed in the goaf; Perform coal cutting and support moving in the working face; After the support moving is completed, enter S8; S8. Move the filling hydraulic support (20) to support the new goaf area, and add a support structure of a group of single hydraulic props (6) and an articulated roof beam (16) in the direction of support moving, and cycle the process of S2 - S7. Continue to pour the cemented filling body (3) in the area to be filled (4) inside the new frame (5), and pile up the gangue filling body (2) outside it to form a filling retaining wall structure.

2. A solid filling working face gob-side entry retaining process according to claim 1, characterized in that: In S1, the distance between two adjacent rows of the single hydraulic props (6) matches the width of the "C"-shaped frame (1); One row of single hydraulic props (6) is arranged closely against the cemented filling body (3) beside the roadway, and the other row of single hydraulic props (6) is close to the roadway wall on the side of the track gateway (7); 3. A solid filling working face gob-side entry retaining process according to claim 1, characterized in that: The two bottom ends of the articulated roof beam (16) are respectively hinged to the single hydraulic props (6) on both sides through two hinges, and the articulated roof beam (16) supports the top wall of the mine roadway.

4. A solid filling working face gob-side entry retaining process according to claim 1, characterized in that: In S2, when using short bolts (17) to support the roof, two short bolts (17) are arranged along the inner side of the long side of the "C"-shaped frame (1). The distance between the two short bolts (17) is equal to one-third of the length value of the "C"-shaped frame (1), and the two short bolts (17) are axially symmetrically distributed about the central axis of the "C"-shaped frame (1).

5. A solid filling working face gob-side entry retaining process according to claim 1, characterized in that: The filled formwork bag (15) is in a cuboid structure in the fully unfolded state, and an accommodation cavity is provided inside it for accommodating the cemented filling body (3); a pouring port (10) is provided through the upper part of the filled formwork bag (15) for filling the cemented filling material into the filled formwork bag (15). Vertical flanges (12) are installed on the four vertical sides of the filled formwork bag (15), and the four vertical flanges (12) are parallelly distributed. A middle flange (9) is installed between two adjacent vertical flanges (12) through a flange sleeve (11).

6. A solid filling working face gob-side entry retaining process according to claim 5, characterized in that: The middle flange (9) is arranged in contact with the outer wall of the filled formwork bag (15). The number of middle flanges (9) on each filled formwork bag (15) is set to two, and the two middle flanges (9) are parallelly distributed and perpendicular to the vertical flanges (12).

7. A solid filling working face gob-side entry retaining process according to claim 5, characterized in that: Steel wires are sleeved on both the middle flange (9) and the vertical flange (12), and iron wires (8) are wound around the outer sides of the middle flange (9) and the vertical flange (12) for fixing the steel wires sleeved in the middle flange (9) and the vertical flange (12).

8. A solid filling working face gob-side entry retaining process according to claim 5, characterized in that: A plurality of anchor bolt holes (13) are correspondingly arranged on the opposite side walls of the filled formwork bag (15). A sealing transition sleeve is connected between two corresponding anchor bolt holes (13), and a tension anchor bolt is arranged inside the sealing transition sleeve. Nuts are connected to both ends of the tension anchor bolt, and adjacent two cemented filling bodies (3) can be combined through the nuts and the tension anchor bolt.

9. A solid filling working face gob-side entry retaining process according to claim 5, characterized in that: A hanging ring (14) is arranged at the top of the filled formwork bag (15) for use during hoisting when arranging the filled formwork bag (15). The number of the hanging rings (14) is at least four, and the multiple hanging rings (14) are distributed in a rectangular array on both sides of the top of the filled formwork bag (15).

10. A solid filling working face gob-side entry retaining process according to claim 1, characterized in that: The number of the filling hydraulic supports (20) is set to be multiple, and the multiple filling hydraulic supports (20) are distributed in a strip shape, and the filling hydraulic supports (20) corresponding to the gangue filling body (2) and the cemented filling body (3) do not move simultaneously.

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