Three-soft coal seam gob-side entry retaining separation wall supporting structure and method

Abstract

The invention discloses a three-soft coal seam gob-side entry retaining separating wall supporting structure which comprises a concrete foundation and a plurality of separating walls, each separating wall is provided with a concave-convex matching tenon-and-mortise structure, and the separating walls are connected together through the concave-convex matching tenon-and-mortise structures. The top of the separating wall is connected with the top plate coal seam through a top plate embedded steel bar threaded steel anchor rod, the concrete foundation is located below the separating wall, and the concrete foundation is connected with the bottom of the separating wall through a bottom plate embedded steel bar threaded steel anchor rod. The invention further discloses a supporting method of the three-soft coal seam gob-side entry retaining separation wall supporting structure. According to the three-soft coal seam gob-side entry retaining separation wall supporting structure and method, the problem that concrete gob-side entry retaining in a three-soft coal seam is difficult in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of gob-side entry retaining support in coal mines, and specifically relates to a support structure for a gob-side entry retaining isolation wall in a soft coal seam, and also relates to a support method for a gob-side entry retaining isolation wall in a soft coal seam. Background Art

[0002] Energy is the foundation of social development, and coal will still play a crucial role in the energy structure. It is necessary to carry out technological innovation in the clean and efficient utilization of coal. However, whether it is a wide coal pillar or gob-side entry driving, there are problems such as a large amount of roadway driving work, tight mining and excavation replacement, and difficulty in gas control in the working face, which seriously affect the safe production of the working face. Therefore, studying the layout of concrete gob-side entry retaining to cancel the coal pillar for roadway protection is beneficial to improving coal recovery rate, reducing roadway driving rate, and ensuring the safe production of the working face, and is of great significance for realizing the green and efficient mining of the coal industry.

[0003] The "soft" coal seam refers to a coal seam where the coal seam, roof, and floor are all soft rock strata. It is widely distributed in China. Due to the low strength and poor self-stabilization ability of the soft coal seam, fast deformation speed and long duration, it is more likely to deform and lose stability under stress disturbance. Especially in some "soft" thick coal seam mining areas in China, the surrounding rock of the coal roadway is extremely easy to weather and disintegrate, and it is difficult to form an anchoring structure for such roadways, which seriously restricts the anchoring support effect of the loose coal seam roadway. At the same time, the strength of the roof and floor of the coal seam is low, usually mudstone or sandy mudstone, further increasing the difficulty of surrounding rock control. Gob-side entry retaining without a coal pillar is an important roadway layout method to save coal resources. Driving along the bottom can minimize resource loss to the greatest extent. However, for gob-side entry retaining of the driving-along-bottom return roadway in a "soft" thick coal seam working face, the direct roof has low strength and also supports the top coal, resulting in difficulties in retaining the roadway. In addition, the surrounding rock structure is diverse, and the influencing factors of roadway stability are more complex. Therefore, it is necessary to form a support structure and method for a gob-side entry retaining isolation wall in a soft coal seam to form an effective means of surrounding rock control and provide a reference solution for gob-side entry retaining countermeasures in mines under similar conditions. Summary of the Invention

[0004] The first object of the invention is to provide a support structure for a gob-side entry retaining isolation wall in a soft coal seam, so as to solve the problem of difficult concrete gob-side entry retaining in a soft coal seam in the prior art.

[0005] In order to achieve the above object, the technical solution adopted by the invention is: a support structure for a gob-side entry retaining isolation wall in a soft coal seam, including a concrete foundation and a plurality of isolation walls. Each isolation wall is formed with a mortise and tenon structure with concave-convex cooperation. The plurality of isolation walls are connected together through the mortise and tenon structure with concave-convex cooperation. The top of the isolation wall is connected to the roof coal seam through a roof-reinforced threaded steel bolt, and the concrete foundation is located below the isolation wall, and the bottom of the concrete foundation is connected to the bottom of the isolation wall through a floor-reinforced threaded steel bolt.

[0006] The technical solution of the present invention also has the following features: The isolation wall is formed by pouring concrete within the flexible formwork.

[0007] Reinforcing bar holes are reserved on the flexible formwork.

[0008] The concave-convex mating mortise and tenon structure is a triangular concave-convex mating mortise and tenon structure.

[0009] The top of the isolation wall is connected to the roof coal seam by multiple roof-reinforced threaded steel bolts.

[0010] The concrete foundation is connected to the bottom of the isolation wall by multiple floor-reinforced threaded steel bolts.

[0011] A groove is excavated between the roadway with gob-side entry retaining in the soft, weak and easily caving coal seam and the gob, and the concrete foundation is poured in the groove.

[0012] The second object of the present invention is to provide a support method for the isolation wall of gob-side entry retaining in soft, weak and easily caving coal seams, so as to solve the problem of difficult gob-side entry retaining with concrete in soft, weak and easily caving coal seams in the prior art.

[0013] In order to achieve the above object, the technical solution adopted by the present invention is: The support method for the isolation wall of gob-side entry retaining in soft, weak and easily caving coal seams is specifically implemented according to the following steps: Step 1, manufacture a flexible formwork with a concave-convex mating mortise and tenon structure; Step 2, reserve grouting holes, drainage holes, measure holes and reinforcing bar holes on the flexible formwork; Step 3, excavate a groove between the roadway with gob-side entry retaining in the soft, weak and easily caving coal seam and the gob, and pour a concrete foundation in the groove; Step 4, install roof-reinforced threaded steel bolts in the roof coal seam and install floor-reinforced threaded steel bolts in the concrete foundation; Step 5, cooperate with the gangue retaining support, hang the flexible formwork, and insert the reinforcing bar holes aligning with the roof-reinforced threaded steel bolts and the floor-reinforced threaded steel bolts; Step 6, fill the flexible formwork with the prepared mortar concrete through the grouting holes, and after the flexible formwork is topped, form an isolation wall with a "triangular" concave-convex mating mortise and tenon structure; Step 7, mark the pourer, time and roof contact condition, and then carry out the pouring of the next wall.

[0014] The beneficial effects of the present invention are as follows: The support structure and method for the gob-side entry retaining isolation wall in the soft coal seam of the present invention apply the "triangle" concave-convex mating mortise and tenon structure isolation wall to the gob-side entry retaining in the soft coal seam for the first time. The method of using a concrete foundation, implanting steel bars in the roof and floor and cooperating with flexible formwork concrete for gob-side entry retaining solves the problem of insufficient strength of the filling wall on the one hand and the problem that the retaining wall in the soft coal seam is prone to toppling on the other hand. Compared with the traditional retaining wall effect, the use of the mortise and tenon structure wall in the present invention reduces the air leakage in the goaf, enhances the wall strength, improves the success rate of gob-side entry retaining, and solves the problem that the wall in the soft coal seam is not easy to form. Therefore, the use of the "triangle" concave-convex mating mortise and tenon structure flexible formwork concrete isolation wall, combined with a concrete foundation and implanting steel bars in the roof and floor, can comprehensively improve the safety of gob-side entry retaining in the soft coal seam, ensure the safe coal mining of the working face in the soft coal seam, and can be widely applied to the field of gob-side entry retaining in the soft coal seam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and form a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is the front view after the layout of the support structure of the gob-side entry retaining isolation wall in the soft coal seam of the present invention; Figure 2 is the schematic plan layout of the support structure of the gob-side entry retaining isolation wall in the soft coal seam of the present invention; Figure 3 is the right view after the layout of the support structure of the gob-side entry retaining isolation wall in the soft coal seam of the present invention.

[0016] In the figure, 1. Goaf, 2. Roof coal seam, 3. Working face, 4. Gob-side entry retaining, 5. Gangue retaining support, 6. Isolation wall, 7. Floor steel bar anchor rod for implanting steel bars, 8. Roof steel bar anchor rod for implanting steel bars, 9. Concrete foundation. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0018] In the description of the present invention, unless otherwise clearly defined, words such as "set", "install", and "connect" should be understood in a broad sense. Those skilled in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0019] Embodiment 1 As Figure 1As shown in the figure, a support structure for gob-side entry retaining isolation walls in soft coal seams with soft roof, soft floor and soft coal body of the present invention includes a concrete foundation 9 and a plurality of isolation walls 6. Each isolation wall 6 is formed with a "triangle"-shaped concave-convex mating mortise and tenon structure. The plurality of isolation walls 6 are connected together through the concave-convex mating mortise and tenon structure. The top of the isolation wall 6 is connected to the roof coal seam 2 through roof-reinforced threaded steel bolts 8. The concrete foundation 9 is located below the isolation wall 6, and the bottom of the concrete foundation 9 is connected to the bottom of the isolation wall 6 through floor-reinforced threaded steel bolts 7. The isolation wall 6 is formed by pouring concrete in a flexible formwork.

[0020] The principle of a support structure for gob-side entry retaining isolation walls in soft coal seams with soft roof, soft floor and soft coal body of the present invention is as follows: By using the isolation wall 6 with a "triangle"-shaped concave-convex mating mortise and tenon structure, pouring the concrete foundation 9, and implanting a plurality of roof-reinforced threaded steel bolts 8 in the top and bottom coal seams 2 and a plurality of floor-reinforced threaded steel bolts 7 in the concrete foundation 9, the problems in the prior art such as the difficulty of gob-side entry retaining with concrete in soft coal seams, poor self-stabilizing ability of the roadway roof and floor, and easy air leakage of the wall are solved. Compared with the traditional gob-side entry retaining method, this technology not only improves the strength of the gob-side entry retaining roadway wall under the conditions of soft coal seams with soft roof, soft floor and soft coal body, enhances the wall stability, but also prevents air leakage in the goaf, hinders the foul air from entering the crossheading, and ensures the safe production of the working face.

[0021] Embodiment 2 Combined with Figure 2 and Figure 3 , a support method for gob-side entry retaining isolation walls in soft coal seams with soft roof, soft floor and soft coal body of the present invention is realized based on the support of the gob-side entry retaining isolation walls in soft coal seams with soft roof, soft floor and soft coal body in Embodiment 1, and is specifically implemented according to the following steps: Step 1: Make a flexible formwork with a "triangle"-shaped concave-convex mating mortise and tenon structure. Step 2: Reserve grouting holes, drainage holes and measure holes on the flexible formwork. Step 3: Pour a concrete foundation 9 between the gob-side entry retaining roadway 4 in the soft coal seams with soft roof, soft floor and soft coal body and the goaf 1. The concrete foundation 9 should be 30 cm wider than the retaining wall and 30 cm - 50 cm deep. Step 4: Install roof-reinforced threaded steel bolts 8 in the roof coal seam 2 and floor-reinforced threaded steel bolts 7 in the concrete foundation 9. The roof-reinforced threaded steel bolts 8 penetrate more than 1 m into the roof coal seam, and the exposed part is 30 cm - 50 cm; the floor-reinforced threaded steel bolts 7 penetrate 30 cm - 50 cm into the floor, and the exposed part is 30 cm - 50 cm. Step 5: Cooperate with the gangue retaining support 5, hang the flexible formwork, and insert the roof-reinforced threaded steel bolts 8 and the floor-reinforced threaded steel bolts 7 from the top and bottom of the flexible formwork. Step 6: Fill the flexible formwork with the prepared mortar concrete through the grouting holes. After the flexible formwork reaches the top, an isolation wall 6 with a "triangle"-shaped concave-convex mating mortise and tenon structure is formed. Step 7: After marking the pourer, time, and top contact situation, proceed with the pouring of the next wall.

[0022] A support method for the isolation wall in gob-side entry retaining in soft coal seams with soft roof, soft floor, and soft coal body. For the first time, an isolation wall with a "triangle"-shaped concave-convex mating mortise and tenon structure is applied to gob-side entry retaining in soft coal seams with soft roof, soft floor, and soft coal body. The method of using a concrete foundation, implanting steel bars in the roof and floor, and combining with flexible formwork concrete for gob-side entry retaining solves the problem of insufficient strength of the filled wall on the one hand and the problem of easy toppling of the isolation wall in gob-side entry retaining in soft coal seams on the other hand. Compared with the traditional effect of the isolation wall in gob-side entry retaining, the use of a mortise and tenon structure wall reduces air leakage in the goaf, enhances the wall strength, improves the success rate of gob-side entry retaining, and solves the problem of difficult wall forming in soft coal seams with soft roof, soft floor, and soft coal body. Therefore, the use of a "triangle"-shaped concave-convex mating mortise and tenon structure flexible formwork concrete isolation wall, combined with a concrete foundation and implanting steel bars in the roof and floor, can comprehensively improve the safety of gob-side entry retaining in soft coal seams with soft roof, soft floor, and soft coal body, ensure the safe coal mining in the working face of soft coal seams with soft roof, soft floor, and soft coal body, and can be widely applied in the field of gob-side entry retaining in soft coal seams with soft roof, soft floor, and soft coal body.

[0023] Example 3 As Figure 1 shown, a support structure for the isolation wall in gob-side entry retaining in soft coal seams with soft roof, soft floor, and soft coal body of the present invention includes a concrete foundation 9 and a plurality of isolation walls 6. Each isolation wall 6 is formed with a "triangle"-shaped concave-convex mating mortise and tenon structure. The plurality of isolation walls 6 are connected together through the concave-convex mating mortise and tenon structure. The top of the isolation wall 6 is connected to the roof coal seam 2 through a roof-implanted steel bar threaded anchor bolt 8. The concrete foundation 9 is located below the isolation wall 6, and the bottom of the concrete foundation 9 is connected to the bottom of the isolation wall 6 through a floor-implanted steel bar threaded anchor bolt 7. The isolation wall 6 is formed by pouring concrete in a flexible formwork. The flexible formwork is provided with implanted steel bar holes, which facilitate the alignment and insertion of the roof-implanted steel bar threaded anchor bolt 8 and the floor-implanted steel bar threaded anchor bolt 7 through the implanted steel bar holes.

[0024] The principle of a support structure for the isolation wall in gob-side entry retaining in soft coal seams with soft roof, soft floor, and soft coal body of the present invention is as follows: By using an isolation wall 6 with a "triangle"-shaped concave-convex mating mortise and tenon structure, combined with pouring a concrete foundation 9, and implanting a plurality of roof-implanted steel bar threaded anchor bolts 8 in the top and bottom coal seams 2 and a plurality of floor-implanted steel bar threaded anchor bolts 7 in the concrete foundation 9, the problems of difficult concrete gob-side entry retaining in soft coal seams, poor self-stabilizing ability of the roadway roof and floor, and easy air leakage of the wall in the prior art are solved. Compared with the traditional gob-side entry retaining method, this technology not only improves the strength of the isolation wall in the gob-side entry retaining roadway under the conditions of soft coal seams with soft roof, soft floor, and soft coal body, enhances the wall stability, but also prevents air leakage in the goaf, hinders the intrusion of polluted air into the crossheading, and ensures the safe production of the working face.

[0025] Example 4 Combined with Figure 2 andFigure 3 , a support method for the gob-side entry retaining isolation wall in soft coal seams of the present invention is realized based on the support of the gob-side entry retaining isolation wall in soft coal seams in Embodiment 1, and is specifically implemented according to the following steps: Step 1, fabricate a flexible template with a "triangle"-shaped concave-convex mating mortise and tenon structure; Step 2, reserve grouting holes, drainage holes, measure holes and rebar planting holes on the flexible template; Step 3, pour a concrete foundation 9 between the gob-side entry retaining roadway 4 in soft coal seams and the goaf 1. The concrete foundation 9 should be 30 cm wider than the retaining wall and the foundation depth is 30 cm - 50 cm; Step 4, install roof rebar planting threaded steel bolts 8 in the roof coal seam 2, and install floor rebar planting threaded steel bolts 7 in the concrete foundation 9. The roof rebar planting threaded steel bolts 8 penetrate more than 1 m into the roof coal seam, and the exposed part is 30 cm - 50 cm; the floor rebar planting threaded steel bolts 7 penetrate 30 cm - 50 cm into the floor, and the exposed part is 30 cm - 50 cm; Step 5, cooperate with the gangue retaining support 5, hang the flexible template, and insert the rebar planting holes aligned with the roof rebar planting threaded steel bolts 8 and the floor rebar planting threaded steel bolts 7; Step 6, fill the flexible template with the prepared mortar concrete. After the flexible template is topped, an isolation wall 6 with a "triangle"-shaped concave-convex mating mortise and tenon structure is formed; Step 7, mark the pourer, time, and roof connection situation, and then proceed with the pouring of the next wall.

[0026] A support method for the gob-side entry retaining isolation wall in soft coal seams of the present invention first applies the isolation wall with a "triangle"-shaped concave-convex mating mortise and tenon structure to the gob-side entry retaining in soft coal seams, and adopts the method of combining a concrete foundation, roof and floor rebar planting with flexible formwork concrete for gob-side entry retaining. On the one hand, it solves the problem of insufficient strength of the filling wall, and on the other hand, it solves the problem that the retaining wall in soft coal seams is prone to toppling. Compared with the effect of the traditional retaining wall, the use of the mortise and tenon structure wall in the present invention reduces the air leakage in the goaf, enhances the wall strength, improves the success rate of gob-side entry retaining, and solves the problem that the wall in soft coal seams is not easy to form. Therefore, adopting the "triangle"-shaped concave-convex mating mortise and tenon structure flexible formwork concrete isolation wall, combined with a concrete foundation and roof and floor rebar planting, can comprehensively improve the safety of gob-side entry retaining in soft coal seams, ensure the safe coal mining of the working face in soft coal seams, and can be widely applied to the field of gob-side entry retaining in soft coal seams.

[0027] Embodiment 5 As Figure 1As shown in the figure, a support structure for an isolation wall in gob-side entry retaining in soft coal seams of the present invention includes a concrete foundation 9 and a plurality of isolation walls 6. Each isolation wall 6 is formed with a "triangle"-shaped concave-convex mating mortise and tenon structure. The plurality of isolation walls 6 are connected together through the concave-convex mating mortise and tenon structure. The top of the isolation wall 6 is connected to the roof coal seam 2 through roof-reinforced threaded steel bolts 8. The concrete foundation 9 is located below the isolation wall 6, and the bottom of the concrete foundation 9 is connected to the bottom of the isolation wall 6 through floor-reinforced threaded steel bolts 7. The isolation wall 6 is formed by pouring concrete in a flexible formwork. The flexible formwork is reserved with rebar holes, through which the roof-reinforced threaded steel bolts 8 and the floor-reinforced threaded steel bolts 7 can be conveniently aligned and inserted. A groove is excavated between the gob-side entry retaining roadway 4 in the soft coal seam and the goaf 1, and the concrete foundation 9 is poured in the groove.

[0028] A support structure for an isolation wall in gob-side entry retaining in soft coal seams of the present invention has the following principle: By using the isolation wall 6 with a "triangle"-shaped concave-convex mating mortise and tenon structure, pouring the concrete foundation 9, and implanting a plurality of roof-reinforced threaded steel bolts 8 in the top and bottom coal seams 2 and a plurality of floor-reinforced threaded steel bolts 7 in the concrete foundation 9, the problems in the prior art that it is difficult to retain the gob-side entry with concrete in soft coal seams, the self-stabilizing ability of the roadway roof and floor is poor, and the wall is prone to air leakage are solved. Compared with the traditional gob-side entry retaining method, this technology not only improves the strength of the gob-side entry retaining wall under the conditions of soft coal seams, enhances the stability of the wall, but also prevents air leakage in the goaf and hinders the polluted air from entering the crossheading, ensuring the safe production of the working face.

[0029] Example 6 Combined with Figure 2 and Figure 3 , a method for supporting an isolation wall in gob-side entry retaining in soft coal seams of the present invention is realized based on the support of the isolation wall in gob-side entry retaining in soft coal seams in Example 1, and is specifically implemented according to the following steps: Step 1: Make a flexible formwork with a "triangle"-shaped concave-convex mating mortise and tenon structure. Step 2: Reserve grouting holes, drainage holes, measure holes and rebar holes on the flexible formwork. Step 3: Excavate a groove between the gob-side entry retaining roadway 4 in the soft coal seam and the goaf 1, and pour the concrete foundation 9 in the groove. The concrete foundation 9 should be 30 cm wider than the retaining wall and the foundation depth should be 30 cm - 50 cm. Step 4: Install roof-reinforced threaded steel bolts 8 in the roof coal seam 2 and install floor-reinforced threaded steel bolts 7 in the concrete foundation 9. The roof-reinforced threaded steel bolts 8 should penetrate more than 1 m into the roof coal seam, with an exposed part of 30 cm - 50 cm; the floor-reinforced threaded steel bolts 7 should penetrate 30 cm - 50 cm into the floor, with an exposed part of 30 cm - 50 cm. Step 5: In cooperation with the gob-side support 5, hang a flexible formwork, align the rebar planting holes with the roof rebar planting threaded steel bolts 8 and insert the floor rebar planting threaded steel bolts 7; Step 6: Fill the flexible formwork with the prepared mortar concrete. After the flexible formwork is in contact with the roof, an isolation wall 6 with a "triangle"-shaped concave-convex mating tenon-mortise structure is formed; Step 7: After indicating the pourer, time, and roof contact situation, proceed with the pouring of the next wall.

[0030] In a gob-side entry retaining isolation wall support method of the present invention, for the first time, an isolation wall with a "triangle"-shaped concave-convex mating tenon-mortise structure is applied to gob-side entry retaining in soft coal seams. The method of using a concrete foundation, roof and floor rebar planting in combination with flexible formwork concrete for gob-side entry retaining solves, on the one hand, the problem of insufficient strength of the filled wall, and on the other hand, the problem of easy toppling of the retaining wall in soft coal seams. Compared with the effect of the traditional retaining wall, the use of a tenon-mortise structure wall in the present invention reduces air leakage in the goaf, enhances the wall strength, improves the success rate of gob-side entry retaining, and solves the problem of difficult wall forming in soft coal seams. Therefore, the use of a "triangle"-shaped concave-convex mating tenon-mortise structure flexible formwork concrete isolation wall, combined with a concrete foundation and roof and floor rebar planting, can comprehensively improve the safety of gob-side entry retaining in soft coal seams, ensure safe coal mining in soft coal seam working faces, and can be widely applied to the field of gob-side entry retaining in soft coal seams.

[0031] The foregoing description illustrates and describes several preferred embodiments of the invention. However, as previously mentioned, it should be understood that the invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the above teachings or the skills or knowledge in related fields. Any alterations and changes made by those skilled in the art without departing from the spirit and scope of the invention shall fall within the protection scope of the appended claims of the invention.

Claims

1. The three-soft coal seam gob-side entry retaining isolation wall support structure is characterized by: The invention comprises a concrete foundation (9) and a plurality of isolation walls (6), each of the isolation walls (6) being formed with a concave-convex mortise and tenon structure, the plurality of isolation walls (6) being connected together through the concave-convex mortise and tenon structure, the top of the isolation wall (6) being connected to the top coal seam (2) through top plate embedded steel threaded anchor rods (8), the concrete foundation (9) being located below the isolation wall (6), and the concrete foundation (9) being connected to the bottom of the isolation wall (6) through bottom plate embedded steel threaded anchor rods (7).

2. The three-soft coal seam gob-side entry retaining isolation wall support structure according to claim 1 is characterized in that: The isolation wall (6) is formed by pouring concrete in the flexible formwork.

3. The three-soft coal seam gob-side entry retaining isolation wall support structure according to claim 2 is characterized in that: Rebar embedding holes are reserved on the flexible formwork.

4. The three-soft coal seam gob-side entry retaining isolation wall support structure according to claim 3 is characterized in that: The concave-convex mortise and tenon structure is a triangular concave-convex mortise and tenon structure.

5. The three-soft coal seam gob-side entry retaining isolation wall support structure according to claim 4 is characterized in that: The top of the isolation wall (6) is connected to the roof coal seam (2) via a plurality of roof reinforcing bar threaded steel anchor rods (8).

6. The three-soft coal seam gob-side entry retaining isolation wall support structure according to claim 5 is characterized in that: The concrete foundation (9) and the bottom of the isolation wall (6) are connected via a plurality of bottom plate embedded threaded steel anchor rods (7).

7. The three-soft coal seam gob-side entry retaining isolation wall support structure according to claim 6 is characterized in that: A groove is excavated between the third-soft coal seam reserved laneway (4) and the goaf (1), and the concrete foundation (9) is cast in the groove.

8. A method for supporting gob-side entry retaining isolation wall in three-soft coal seams, using the gob-side entry retaining isolation wall supporting structure in three-soft coal seams according to any one of claims 1 to 7, characterized in that: Follow the steps below to implement it: Step 1, making a flexible template with a concave-convex mortise and tenon structure; Step 2, reserve grouting holes, drainage holes, measure holes and reinforcement holes on the flexible formwork; Step 3, excavating a groove between the three-soft coal seam reserved roadway (4) and the goaf (1), and pouring a concrete foundation (9) in the groove; Step 4, installing the top plate embedded steel threaded anchor rod (8) in the top plate coal seam (2), and installing the bottom plate embedded steel threaded anchor rod (7) in the concrete foundation (9); Step 5, cooperate with the rock retaining bracket (5), hang the flexible template, align the anchor holes with the top plate anchor threaded steel anchor rod (8) and the bottom plate anchor threaded steel anchor rod (7), and insert them; Step 6, fill the flexible formwork with the prepared mortar concrete through the grouting holes, and after the flexible formwork is connected to the top, a "triangular" concave-convex matching mortise and tenon structure isolation wall (6) is formed; Step 7: Mark the pouring personnel, time, and top connection conditions before pouring the next wall.

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