Solid filling face along the roadway process

Abstract

The application discloses a kind of solid filling working face along empty roadway process, two rows of single hydraulic prop are arranged along strike in track crossheading, and support hinged roof beam is supported;After working face cuts coal and moves support, single hydraulic prop is arranged between support rear roof beam and roadside support body, and short anchor rod is used to support roof;A 'F' shaped frame is arranged along the working face, a mold bag is fixed inside the frame, and the hydraulic prop on the goaf side is withdrawn;Through the filling pipeline of cementation, the filling body is formed after filling and solidification in the mold bag, and the support is moved once a time, and the pouring is poured once a time.The application forms a support system on the roadside, effectively resists the deformation and movement of the roof, and enhances the stability of the roadway along the empty roadway;Various support structures are used to cooperate, improve the stability of coal structure during the operation of roadway along empty roadway, not only can improve the safety of roadway, but also can prolong its service life, ensure the normal production of mine;Realize the coal pillar filling mining along empty roadway.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal resource exploitation support, more particularly to a solid filling working face gob-side entry retaining process. BACKGROUND

[0002] In recent years, with the gradual depletion of coal resources and the enhancement of environmental protection awareness, solid filling technology has been widely applied. This technology can effectively reduce the impact of coal mining on the geological environment, while improving the safety and economic benefits of the mine. During the process of coal filling mining, a coal pillar of about 20m is usually left between the upper and lower sections of the two working faces, which occupies a certain amount of mineral resources, resulting in waste of resources, affecting the progress and efficiency of coal mining, and increasing production costs. Therefore, the no-pillar gob-side entry retaining method has been valued in practical applications.

[0003] The gob-side entry retaining process can reduce the amount of roadway excavation, save excavation costs, alleviate the tight connection, maximize resource recovery, and extend the life of the mine, with significant economic and social benefits, and strong use and promotion value. However, this method has high construction difficulty and cost, which may lead to a decrease in the stability of the roadway and increase the safety risk of the mine.

[0004] In view of the above technical problems, it is necessary to develop a solid filling working face gob-side entry retaining process. SUMMARY

[0005] The present application aims to provide a solid filling working face gob-side entry retaining process that is simple in structure, safe and efficient, and which can improve the stability of the roadway and achieve coal pillar filling mining gob-side entry retaining by pouring along the working face, using a frame and filling mold bag to pour the cemented filling body.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a solid filling working face gob-side entry retaining process suitable for no-pillar filling mining gob-side entry retaining, comprising the following steps:

[0007] S1, using a movable filling hydraulic support to pre-support the goaf, installing two rows of single hydraulic props along the strike of the roadway in the track crossheading, and supporting the mine roadway roof with a hinged top beam above them;

[0008] S2, setting two new single hydraulic props corresponding to the hinged top beam behind the filling hydraulic support, and further supporting the roadway roof with short anchor rods;

[0009] S3. A U-shaped frame is vertically installed between the two newly added single hydraulic props and two of the two hinged top beams on one side, with short anchor rods located inside the U-shaped frame. A filling mold bag is embedded inside the U-shaped frame and its edges are fixed. The filling mold bag is inflated with air until it is fully expanded. The two newly added single hydraulic props in the goaf area are removed. Tie bolts are installed on the filling mold bag and the U-shaped frame.

[0010] S4. Before processing the backfill retaining wall structure, the backfilling equipment must be inspected and sufficient backfilling materials must be prepared. The cemented backfilling material slurry should be prepared. A self-propelled gangue transfer machine and a bottom-discharge conveyor should be used to transport the backfilling material into the roadway. After the personnel in the backfilling area have conducted a comprehensive inspection and passed the inspection, a signal should be sent to the pump station to start slurry preparation. After the pump station staff add the material, the mixing tank should be pre-mixed. After the mixing is completed, the grouting pump should be turned on. After the personnel in the backfilling area have observed that the slurry is qualified, the cemented backfilling material should be filled into the backfilling mold bag through the cemented backfilling pipeline.

[0011] S5. After the filling mold bag is filled and connected to the top, remove the cemented filling pipeline from the filling mold bag and seal the injection port. After the cemented filling material solidifies, it forms a cemented filling body; tighten the nuts of the tie bolts.

[0012] S6. Use coal gangue for backfilling to pile up gangue backfill in the goaf next to the roadway, and set the gangue backfill tightly against the cemented backfill until it is flush with the end of the outermost cemented backfill.

[0013] S7. The scraper conveyor intermittently excavates the coal seam inside the mine, and the excavated coal blocks are output to form a new goaf area in the goaf area; the working face is cut and the support is moved; after the support is moved, it enters S8;

[0014] S8. The mobile filling hydraulic support supports the new goaf area and adds a set of single hydraulic props and hinged top beams in the direction of the support movement. The process of S2-S7 is repeated. Cemented filling body is poured in the area to be filled in the newly added "U" shaped frame. Gangue filling body is piled up on the outside to form a filling retaining wall structure.

[0015] Preferably, in S1, the distance between two adjacent rows of individual hydraulic struts matches the width of the "U"-shaped frame;

[0016] One row of individual hydraulic props is positioned close to the cemented backfill material beside the roadway, while the other row of individual hydraulic props is positioned close to the roadway wall on the side of the track roadway.

[0017] Preferably, the bottom ends of the hinged top beam are respectively hinged to the individual hydraulic supports on both sides by two hinges, so as to support the top wall of the mine roadway.

[0018] Preferably, in S2, when the short anchor rod is used to support the roof, two short anchor rods are arranged along the inner side of the long side of the frame, the distance between the two short anchor rods is equal to one third of the length of the frame, and the two short anchor rods are symmetrically distributed about the central axis of the frame.

[0019] Preferably, the filling mold bag is in a cuboid structure in a fully expanded state, and an accommodation cavity is arranged in the filling mold bag for accommodating the cemented filling body; a pouring port is arranged on the filling mold bag for filling the cemented filling material into the filling mold bag.

[0020] The four vertical flanges are arranged on the four vertical edges of the filling mold bag, and the four vertical flanges are arranged in parallel, and a middle flange is arranged between two adjacent vertical flanges through a flange sleeve.

[0021] Preferably, the middle flange is arranged in close contact with the outer wall of the filling mold bag, and the number of middle flanges on each filling mold bag is two, and the two middle flanges are arranged in parallel and perpendicularly to the vertical flanges.

[0022] Preferably, the middle flange and the vertical flange are sleeved with a steel wire rope, and the outer side of the middle flange and the vertical flange is provided with a wire for fixing the steel wire rope sleeved in the middle flange and the vertical flange.

[0023] Preferably, a plurality of anchor bolt holes are arranged on the opposite two side walls of the filling mold bag in a one-to-one correspondence, a sealing transition sleeve is connected between the two corresponding anchor bolt holes, and a tension anchor is arranged in the sealing transition sleeve.

[0024] Preferably, the top of the filling mold bag is provided with a hanging ring, which is used for lifting when the filling mold bag is arranged.

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

[0026] Preferably, the number of the filling hydraulic supports is multiple, the plurality of filling hydraulic supports are arranged in a strip shape, and the corresponding filling hydraulic supports of the gangue filling body and the cemented filling body are not moved at the same time.

[0027] The technical effects and advantages of the present application are as follows:

[0028] 1. Through pouring the cemented filling body in the gob area beside the roadway, and stacking the gob filling gangue on one side of the cemented filling body, a support system is formed, which effectively resists the deformation and movement of the roof, thereby enhancing the stability of the roadway along the gob; in the operation process, the filling hydraulic support, the " " shaped frame, the single hydraulic prop, the hinged roof beam, the short anchor rod and other multi-structure supports are used to improve the stability of the coal structure during the operation of the roadway along the gob; not only the safety of the roadway can be improved, but also the service life of the roadway can be prolonged, and the normal production of the mine can be ensured;

[0029] 2. The roadway along the gob not only can provide a convenient channel for the subsequent mining operation, but also can facilitate the production replacement; through reasonable roadway planning, not only the waste of coal resources can be reduced, the economic benefit of the coal mine can be improved, but also the continuity and stability of the production can be ensured;

[0030] 3. In the solid filling working face along the gob roadway technology, the construction cemented filling process is combined with the solid filling process in the gob area; the coal pillar filling mining along the gob roadway is realized, which has the advantages of simple structure and good social benefits; compared with the gangue bag roadway method, it is more rapid, and the production efficiency is greatly improved, which is convenient for popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The filling structure distribution diagram of the solid filling working face along the gob roadway technology provided by the present application;

[0032] Figure 2 The gob area filling stack forming control process flow chart in the solid filling working face along the gob roadway technology provided by the present application;

[0033] Figure 3 The local structure reference drawing when installing the newly added " " shaped frame in the solid filling working face along the gob roadway technology provided by the present application;

[0034] Figure 4 The distribution structure schematic diagram of the gob area filling gangue, the cemented filling body and the hinged roof beam in the present application;

[0035] Figure 5 The distribution structure side view of the " " shaped frame, the newly added " " shaped frame and the single hydraulic prop in the present application;

[0036] Figure 6 The structure schematic diagram of the " " shaped frame (partially truncated) in the present application;

[0037] Figure 7 The filling bag structure schematic diagram in the present application.

[0038] In the drawings:

[0039] 1, "F" frame; 2, gangue filling in goaf; 3, cemented filling body; 4, area to be filled; 6, single hydraulic prop; 7, track crossheading; 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 anchor rod; 18, self-moving gangue transfer machine; 19, multi-hole bottom discharge conveyor; 20, filling hydraulic support; 21, scraper conveyor; 22, coal body. DETAILED DESCRIPTION

[0040] An embodiment of the present application will be further described below in conjunction with the accompanying drawings:

[0041] Referring to the drawings shown in the description, Figures 1-7 A solid filling working face along the roadway process is suitable for pillarless filling mining along the roadway, comprising the following steps:

[0042] S1, use the movable filling hydraulic support 20 to pre-support the goaf area, in order to improve the support strength of the mine roadway roof, provide safe and reliable support and positioning effect for the filling retaining wall structure, install two rows of single hydraulic props 6 along the strike in the track crossheading 7 of the roadway, and support the mine roadway roof by supporting the articulated roof beam 16 above it;

[0043] S2, two new single hydraulic props 6 are arranged corresponding to the articulated roof beam 16 behind the filling hydraulic support 20, the two new single hydraulic props 6 are distributed in parallel with the two single hydraulic props 6 on one side of the corresponding two articulated roof beams 16, and are distributed in a rectangular array, which is located between the articulated roof beam 16 and the roadside support body; and the roadway roof is further supported by short anchor rods 17, the number of short anchor rods 17 is at least two, as shown in Figure 2 (a);

[0044] S3, a "F" frame 1 is vertically arranged between the two new single hydraulic props 6 and the two single hydraulic props 6 corresponding to one side of the two articulated roof beams 16, the short anchor rods 17 are located inside the "F" frame 1, the filling mold bag 15 is embedded inside the "F" frame 1 and the edges are fixed, the filling mold bag 15 is inflated inside to make it fully expanded after being inflated; the two new single hydraulic props 6 in the goaf area are withdrawn; as shown in Figure 2 (b); the tension anchor bolts are arranged on the filling mold bag 15 and the "F" frame 1;

[0045] S4, before the filling retaining wall structure is processed, the filling equipment needs to be overhauled, and the filling material is prepared and the cemented filling material is prepared into slurry; the self-moving gangue transfer machine 18 and the hole bottom unloading conveyor 19 are used to transport the filling material into the roadway; the filling area personnel give a signal to start the slurry preparation after the overall inspection is qualified, the pump station staff adds the material, the stirring barrel is pre-stirred, the grouting pump is started after the stirring is completed, and the filling area personnel observe the qualified slurry, and then the cemented filling material is filled into the filling mold bag 15 through the cemented filling pipeline; in this embodiment, the concrete is used, the cemented filling pipeline is inserted into the filling mold bag 15 for filling; during the filling process, the firmness of the roof and the single hydraulic prop 6 around the “” shaped frame 1 is checked, and when looseness is found, the column should be set in time;

[0046] S5, after the filling mold bag 15 is filled to the top, the cemented filling pipeline is taken out of the filling mold bag 15, and the pouring port 10 is closed, which can be tied solidly by using a rope; the cemented filling material is solidified to form a cemented filling body 3, as shown in (c); Figure 2 Tighten the nut of the tension anchor bolt;

[0047] S6, the coal gangue for filling is used to stack the gangue filling body 2 in the gob area beside the roadway, and the gangue filling body 2 is arranged close to the cemented filling body 3 until the end of the outermost cemented filling body 3 is flush;

[0048] S7, the scraper conveyor 21 intermittently digs the coal body 22 in the mine, and after the coal is output, a new gob area is formed in the gob area; the working face cuts coal and moves the support; that is, the self-moving gangue transfer machine 18, the hole bottom 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 is moved, S8 is entered;

[0049] S8, the new gob area is supported by the moving filling hydraulic support 20, and a set of single hydraulic prop 6 and hinged roof beam 16 support structure are added in the moving direction, and the S2-S7 process is circulated, the cemented filling body 3 is continuously poured in the filling area 4 in the newly added “” shaped frame 1, and the gangue filling body 2 is stacked outside to form a filling retaining wall structure, as shown in (d). Figure 2

[0050] The above process can form a support system in the gob area in the roadway, effectively resist the deformation and movement of the roof, and thus enhance the stability of the gob-side entry retaining. This method not only can improve the safety of the roadway, but also can prolong the service life and ensure the normal production of the mine.

[0051] ​Further, as a preferred embodiment in the present application, in S1, the distance between the two adjacent rows of single hydraulic props 6 matches the width of the "F" shaped frame 1, and in the present embodiment, the "F" shaped frame 1 adopts wood with the specifications of 3000mm x 800mm, that is, the distance between the two adjacent rows of single hydraulic props 6 is also set to 800mm.

[0052] One row of single hydraulic props 6 is arranged close to the roadway-side cemented filling body 3, and the other row of single hydraulic props 6 is arranged close to the roadway wall near the side of the track entry 7.

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

[0054] Further, as a preferred embodiment in the present application, in S2, when the short anchor rod 17 is used to support the roof, two short anchor rods 17 are arranged along the inner side of the long side of the "F" shaped frame 1, and the distance between the two short anchor rods 17 is equal to one-third of the length of the "F" shaped frame 1, and in the present embodiment, the distance between the two short anchor rods 17 is set to 1000mm, and the two short anchor rods 17 are axially symmetrically distributed about the central axis of the "F" shaped frame 1.

[0055] Further, as a preferred embodiment in the present application, the filling bag 15 has a cuboid structure in the fully expanded state, and has an accommodating cavity inside for accommodating the cemented filling body 3; and a pouring port 10 is arranged through the filling bag 15, for filling the cemented filling material into the filling bag 15.

[0056] The filling bag 15 is provided with four vertical flanges 12 on the four vertical edges, and the four vertical flanges 12 are parallelly distributed, and two adjacent vertical flanges 12 are provided with a middle flange 9 through a flange sleeve 11.

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

[0058] Further, as a preferred embodiment in the present application, the middle flange 9 and the vertical flange 12 are both provided with a steel wire rope, which helps to increase the tensile strength of the filling bag 15, bear part of the lateral pressure of the un-solidified cemented filling material, and achieve the effects of balancing the pressure and controlling the thickness; and the outer side of the middle flange 9 and the vertical flange 12 is provided with an iron wire 8 for fixing the steel wire rope sleeved into the middle flange 9 and the vertical flange 12.

[0059] Further, as the preferred embodiment in the present application, a plurality of anchor holes 13 are arranged on the opposite two side walls of the filling mold bag 15, a sealing transition sleeve is connected between the corresponding two anchor holes 13, and a pull anchor is arranged in the sealing transition sleeve, both ends of the pull anchor are connected with nuts, and the adjacent two cemented filling bodies 3 can be combined by the nuts and the pull anchor, the connection between the cemented filling body 3 and the " " shaped frame 1 is realized, and the plurality of cemented filling bodies 3 are integrally arranged, so as to increase the overall supporting strength of the filling retaining wall structure.

[0060] Further, as the preferred embodiment in the present application, the top of the filling mold bag 15 is provided with a hanging ring 14, which is used for lifting when the filling mold bag 15 is arranged.

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

[0062] Further, as the preferred embodiment in the present application, the number of the filling hydraulic supports 20 is set to be multiple, the plurality of filling hydraulic supports 20 are arranged in a strip shape, and the corresponding filling hydraulic supports 20 of the gangue filling body 2 and the cemented filling body 3 are not moved at the same time; specifically, in the gob-side entry retaining process provided by the present application, 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, and the filling hydraulic support 20 located in front of the gangue filling body 2 is kept stationary, before stacking the gangue filling body 2, the filling hydraulic support 20 arranged in front of the gangue filling body 2 is moved.

[0063] Finally: the above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A solid-filling face along the roadway process, characterized in that, The method comprises the following steps: S1, pre-supporting the goaf area using movable filling hydraulic support (20), installing two rows of single hydraulic props (6) along the strike of the track crossheading (7) in the roadway, and supporting the mine roadway roof by supporting the hinged roof beam (16) above it; S2, setting two new single hydraulic props (6) corresponding to the hinged roof beam (16) behind the filling hydraulic support (20), and further supporting the roadway roof using short anchor rods (17); S3, vertically installing a " " frame (1) between the two newly added single hydraulic props (6) and the two single hydraulic props (6) corresponding to one side of the two hinged roof beams (16), embedding the filling mold bag (15) in the " " frame (1) and fixing the edges, inflating the filling mold bag (15) to make it fully expand, withdrawing the two newly added single hydraulic props (6) in the goaf area, and threading the tension anchor bolt on the filling mold bag (15) and the " " frame (1); S4, cooperating the self-moving gangue transfer machine (18) and the hole bottom unloading conveyor (19) to transport filling materials into the roadway, and filling cemented filling materials into the filling mold bag (15) through the cemented filling pipeline; S5, after the filling mold bag (15) is filled and topped, the cemented filling pipeline is taken out of the filling mold bag (15), the pouring port (10) is closed, the cemented filling material is solidified to form a cemented filling body (3), and the nut of the tension anchor bolt is tightened; S6, using filling coal gangue to stack the gangue filling body (2) in the goaf area beside the roadway, and arranging the gangue filling body (2) closely to 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 the coal body (22) in the mine, and outputs the excavated coal to form a new goaf area in the goaf area; The working face cuts coal and moves the support; After the support is moved, S8 is entered; S8, moving the filling hydraulic support (20) to support the new goaf area, adding a set of single hydraulic props (6) and hinged roof beams (16) in the support structure in the direction of the moved support, and circulating the processes of S2-S7 to continue pouring the cemented filling body (3) in the filling area (4) in the newly added " " frame (1) and stacking the gangue filling body (2) outside to form a filling retaining wall structure.

2. A process for gob-side entry retaining with solid backfilling of a coal face as claimed in claim 1, characterized in that, In S1, the distance between the two rows of single hydraulic props (6) is matched with the width of the " " frame (1); One row of single hydraulic props (6) is arranged closely to the cemented filling body (3) beside the roadway, and the other row of single hydraulic props (6) is arranged close to the side wall of the roadway near the track crossheading (7).

3. A process for gob-side entry retaining with solid backfilling of a coal face according to claim 1, characterised in that, The hinged roof beam (16) is hinged to the single hydraulic props (6) on both sides through two hinges at the bottom of both ends, and then the hinged roof beam (16) supports the mine roadway top wall.

4. A process for gob-side entry retaining with solid backfilling of a coal face according to claim 1, characterised in that, In S2, when the short anchor rod (17) is used to support the roof, two short anchor rods (17) are arranged along the inner side of the long side of the " " frame (1), the distance between the two short anchor rods (17) is equal to one third of the length of the " " frame (1), and the two short anchor rods (17) are symmetrically distributed about the central axis of the " " frame (1).

5. A solid-filling face with a gob-side entry retaining process according to claim 1, characterized in that, The filling mold bag (15) is in a fully expanded state and has a cuboid structure, and an accommodating cavity is arranged inside for accommodating the cemented filling body (3); a pouring port (10) is arranged on the filling mold bag (15) for filling cemented filling material into the filling mold bag (15). The filling mold bag (15) is provided with a vertical flange (12) on each of the four vertical edges, and the four vertical flanges (12) are arranged in parallel, and a middle flange (9) is arranged between two adjacent vertical flanges (12) through a flange sleeve (11).

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

7. A solid-filling face with a gob-side entry retaining process according to claim 5, characterized in that, The middle flange (9) and the vertical flange (12) are both sleeved with a steel wire rope, and the outer side of the middle flange (9) and the vertical flange (12) is provided with a wire (8) for fixing the steel wire rope sleeved in the middle flange (9) and the vertical flange (12).

8. A solid-filling face longwall process as claimed in claim 5, wherein, A plurality of anchor bolt holes (13) are arranged on the opposite side walls of the filling mold bag (15), and a sealing transition sleeve is connected between the corresponding two anchor bolt holes (13), and a tension anchor is arranged in the sealing transition sleeve, and the two ends of the tension anchor are connected with nuts, and the adjacent two cemented filling bodies (3) can be combined through the nuts and the tension anchor.

9. A solid-filling face with a gob-side entry retaining process according to claim 5, characterized in that, The top of the filling mold bag (15) is provided with a hanging ring (14) for lifting during the arrangement of the filling mold bag (15). The number of hanging rings (14) is at least four, and the plurality of hanging rings (14) are arranged in a rectangular array on both sides of the top of the filling mold bag (15).

10. A process for gob-side entry retaining with solid backfilling of a coal mining face as claimed in claim 1, characterized in that, The number of filling hydraulic supports (20) is set to be multiple, and the plurality of filling hydraulic supports (20) are arranged in a strip shape, and the corresponding filling hydraulic supports (20) of the gangue filling body (2) and the cemented filling body (3) are not moved at the same time.

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