A reusable coal mine filling retaining wall

Abstract

The utility model discloses a kind of reusable coal mine filling retaining wall, it is related to retaining wall field, including steel skeleton, steel skeleton is equipped with steel panel and high molecule panel by bolt, steel panel and high molecule panel constitute combined sealing panel.The utility model is through the design of modular steel frame and combined sealing panel, the quick installation of retaining wall, disassembly and recycling are realized, construction efficiency is greatly improved and cost is reduced;Through integrated monitoring system, the visualization and data real-time monitoring of filling process are realized, and the "blind filling" state is completely got rid of;Through the pressure relief system of initiative control, it can be rapidly intervened when internal pressure is over-limit, effectively prevent "wall explosion" accident, significantly improve the operation safety;Through the filter drainage system set, the redundant moisture of filling body can be discharged in time, accelerate solidification and optimize its final strength, comprehensively improve the quality and intelligent level of filling operation.

Description

Technical Field

[0001] This utility model relates to the field of retaining walls, specifically to a reusable coal mine backfill retaining wall. Background Technology

[0002] In coal mine goaf backfilling operations, retaining walls need to be constructed to seal and contain the backfill slurry. Coal mine backfilling retaining walls are important facilities in coal mine backfilling mining methods. When using backfilling mining, as the longwall face advances, backfilling materials need to be sent into the goaf. At this time, it is necessary to construct backfilling retaining walls to seal the entrance to the mining area or the goaf, ensuring that the slurry does not leak into other areas during the backfilling process.

[0003] Traditional retaining walls are generally constructed using brick-concrete structures or monolithic concrete casting. These retaining walls suffer from long construction periods, high labor intensity, and non-recyclable materials, resulting in low filling efficiency and high costs. More critically, during the filling operation, they form a completely closed solid structure, making the internal filling process an unpredictable "blind filling" state. Operators cannot monitor the slurry flow, whether it has reached the roof, or the actual pressure the retaining wall is under. This lack of process control makes it highly susceptible to sudden "wall bursting" accidents when the internal slurry pressure exceeds the retaining wall's ultimate bearing capacity, causing slurry leakage, production interruption, and seriously threatening underground safety. Furthermore, traditional retaining walls have limited functionality, lacking active pressure relief and efficient water filtration capabilities. They cannot proactively intervene to ensure safety during risks or optimize the quality of the filling material. These problems severely restrict the safety, efficiency, and economy of coal mine filling operations, urgently requiring an integrated and intelligent solution.

[0004] Existing technologies occasionally employ simple steel baffles or bagged blocks in an attempt to simplify construction, but their structural strength and sealing performance are often insufficient, and they lack a systematic modular design. Addressing the core issues of "blind filling" and high safety risks, the most similar solution currently adopted by most mines is to pre-embed one or more ordinary steel pipes as "observation holes" or "pressure relief pipes" during retaining wall construction. Workers periodically tap the pipes to check for blockages, or observe whether slurry flows out at the pipe outlet to determine if the filling is complete. Internal pressure control relies entirely on thickening the retaining wall structure or expecting the pre-embedded pipes to passively overflow when pressure is too high. This simple solution based on ordinary steel pipes cannot achieve real-time data monitoring and early warning; the pressure relief process is passive and uncontrollable, failing to fundamentally eliminate the risk of "wall bursting," and its reliability and level of intelligence are extremely low.

[0005] The existing method of pre-embedding ordinary steel pipes as observation and pressure relief channels cannot provide real-time, quantitative monitoring of the filling process. It can only provide extremely limited and delayed information through passive overflow, failing to achieve early warning and active control of internal pressure, and the safety hazards remain prominent. Furthermore, this method does not form a complete system integration with simple steel baffles or bagged blocks, resulting in poor structural strength, sealing reliability, and reusability, and failing to fundamentally solve the problems of low construction efficiency and high cost of traditional retaining walls.

[0006] Therefore, it is necessary to invent a reusable coal mine backfill retaining wall to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a reusable coal mine backfill retaining wall to solve the problems mentioned in the background art, such as the traditional retaining wall having a single function, lacking the ability to actively relieve pressure and efficiently filter water, and being unable to actively intervene to ensure safety in case of risks, nor being able to optimize the quality of the backfill.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a reusable coal mine backfill retaining wall, comprising a steel frame, on which steel panels and polymer panels are bolted together. The steel panels and polymer panels constitute a composite sealing panel. This composite sealing panel employs a composite structure of a metal backing plate and a non-metallic sealing layer, ensuring both overall structural strength and rigidity while achieving lightweight design and excellent sealing and corrosion resistance. The steel panels are located on the roadway side, and the polymer panels are located on the goaf side. A filter screen is tightly installed on the goaf side of the polymer panels. The steel panels and polymer panels are... The filter screen is mechanically anchored and composited through bolts and pre-set fixing structures. The combined sealing panel has pre-embedded water flow pipes and a drain valve, which is fixedly connected to the steel frame. The combined sealing panel is equipped with an observation window, which is also fixedly connected to the steel frame. The monitoring control panel is integrated and installed on the side wall of the tunnel. The monitoring control panel is connected to the sensor and actuator through wiring. The support frame on the steel frame is used to reinforce the connection between the steel frame and the top and bottom plates of the tunnel. A water filter chamber is installed at the lower end of the combined sealing panel block. The water filter chamber is connected to the tunnel drainage system through a drain pipe.

[0009] Preferably, the steel panel and the polymer panel are stacked together. The thickness of the steel panel is 10 to 16 mm, and the thickness of the polymer panel is 20 to 30 mm. The steel panel and the polymer panel are connected by countersunk bolts distributed in a matrix, with the spacing between the bolts being 300 to 450 mm.

[0010] Preferably, there are three observation windows, which are equally spaced vertically and are located on the upper, middle and lower parts of the combined sealing plate. The vertical distance between adjacent observation windows is no more than 2 meters and no less than 1 meter, so as to achieve layered and visual observation of the filling process.

[0011] Preferably, the steel frame is arranged in a nine-square grid pattern.

[0012] Preferably, the monitoring control panel has a built-in data processing unit and a preset pressure alarm threshold. When the pressure sensor reading exceeds the set threshold, the monitoring control panel can issue an audible and visual alarm and control the pressure relief valve to open.

[0013] Preferably, the filter chamber is composed of two layers of stainless steel mesh sandwiching geotextile.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0015] This invention, through its modular steel frame and combined sealing panel design, enables rapid installation, disassembly, and reuse of retaining walls, significantly improving construction efficiency and reducing costs. An integrated monitoring system provides visualized and data-driven real-time monitoring of the filling process, completely eliminating "blind filling." An actively controlled pressure relief system intervenes rapidly when internal pressure exceeds limits, effectively preventing "wall bursting" accidents and significantly improving operational safety. A drainage system promptly removes excess moisture from the filling material, accelerating solidification and optimizing its final strength, comprehensively improving the quality and intelligence of the filling operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a right view of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the installation of the steel frame and sealing panel in the retaining wall of this utility model;

[0020] Figure 4 This is a schematic diagram of the pre-designed pipeline distribution on the polymer panel of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Steel panel; 2. Polymer panel; 3. Observation window; 4. Steel frame; 5. Monitoring control panel; 6. Support frame; 7. Filter chamber; 8. Drain pipe; 9. Bolt; 10. Drain valve; 11. Fixing structure; 12. Filter screen. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] This utility model provides, for example Figure 1-4 The reusable coal mine backfill retaining wall shown includes a steel frame 4. Steel panels 1 and polymer panels 2 are assembled and installed on the steel frame 4 using bolts 9. The steel frame 4 is connected in a nine-square grid pattern. The steel panels 1 and polymer panels 2 form a combined sealing panel. The two panels are fastened together by bolts 9. The combined sealing panel adopts a composite structure of a metal backing plate and a non-metallic sealing layer, ensuring both overall structural strength and rigidity while achieving lightweight design and excellent sealing and corrosion resistance. The steel panel 1 is located on the roadway side, and the polymer panel 2 is located on the goaf side. A filter screen 12 is installed tightly against the goaf side of the polymer panel 2. The steel panel 1, polymer panel 2, and filter screen 12 are mechanically anchored and combined using bolts 9 and a pre-installed fixing structure 11. Multi-directional pipelines (see reference) are embedded in the combined sealing panel. Figure 4 The combined sealing panel is equipped with a drain valve 10, which is fixedly connected to the steel frame 4. A filter chamber 7 is installed at the lower end of the combined sealing panel block. The filter chamber 7 is connected to the roadway drainage system through a drain pipe 8. During the filling process, the drain valve 10 can be opened in sequence to allow water to reach the filter chamber 7 through the pre-embedded pipes on the combined sealing panel to achieve drainage. An observation window 3 is provided on the combined sealing panel, which is fixedly connected to the steel frame 4. A monitoring control panel 5 is integrated and installed on the side wall of the roadway. The monitoring control panel 5 is connected to the sensor and actuator through a line. The support frame 6 on the steel frame 4 is used to reinforce the connection between the steel frame 4 and the top and bottom plates of the roadway.

[0025] Steel panel 1 and polymer panel 2 are stacked together. The thickness of steel panel 1 is 10 to 16 mm and the thickness of polymer panel 2 is 20 to 30 mm. Steel panel 1 and polymer panel 2 are connected by a matrix of countersunk bolts 9. The spacing between the multiple bolts 9 is 300 to 450 mm.

[0026] There are three observation windows 3, which are equally spaced vertically and are located on the upper, middle and lower parts of the combined sealing plate. The vertical distance between adjacent observation windows 3 is no more than 2 meters and no less than 1 meter. This allows for layered and visual observation of the filling process. The monitoring control panel 5 has a built-in data processing unit and a preset pressure alarm threshold. When the pressure sensor value exceeds the set threshold, the monitoring control panel 5 can issue an audible and visual alarm and control the pressure relief valve to open.

[0027] The flow state of the slurry can be observed in real time through the observation window 3, and the internal pressure changes can be monitored through the monitoring control panel 5. If the monitored pressure exceeds the preset threshold, the pressure relief valve will be activated immediately through the monitoring control panel 5 to release pressure until the pressure returns to the normal range. The monitoring system realizes process visualization and data through the observation window 3 and pressure sensor. During the filling process, the drain valve 10 is opened in sequence according to different filling stages to allow water to flow through the multi-directional pipeline pre-embedded on the combined sealing panel to the filter chamber 7. The filter chamber 7 is composed of two layers of stainless steel mesh sandwiching geotextile. The filter chamber 7 starts to continuously filter water. The filtration and drainage system continuously optimizes the quality of the filling body through the filter chamber 7. The integration of the three major functional systems of protection monitoring, pressure relief and filtration and drainage on the main body of the retaining wall, as well as their mutual cooperation and collaborative work to achieve intelligent monitoring and active safety control, are demonstrated.

[0028] Working principle: When in use, determine the installation position in the tunnel, erect the assembled modular sealing panel in the predetermined position, use the support frame 6 and the fixing structure 11 to fix the bottom and two sides of the modular steel frame 4 to the tunnel floor and sidewalls, and use bolts 9 to tighten from the tunnel side, press the sealing strip, install the observation window 3 and drainage valve 10, connect the monitoring control panel 5 with the pressure sensor and pressure relief valve, and complete the connection between the filter chamber 7 and the drainage pipe 8. Finally, perform system debugging to confirm that the monitoring control panel 5 displays normally, the pressure relief valve opens and closes flexibly, and the filter drainage is unobstructed.

[0029] When the filling operation begins, the flow state of the slurry is observed in real time through the observation window 3, and the internal pressure changes are monitored through the monitoring control panel 5. During the filling process, the drain valve 10 is opened in sequence according to different filling stages to allow water to reach the filter chamber 7 through the pre-embedded pipes on the combined sealing panel. The filter chamber 7 starts to continuously filter water. After the filling operation is completed and the filling body is stable, the bolts 9, each functional component and steel frame 4 are disassembled in reverse order, and all modular components are transported to the next working face for recycling.

[0030] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A reusable coal mine backfill retaining wall, comprising a steel frame (4), characterized in that, A steel panel (1) and a polymer panel (2) are mounted on the steel frame (4) by bolts (9). The steel panel (1) and the polymer panel (2) constitute a combined sealing panel. The steel panel (1) is located on the roadway side, and the polymer panel (2) is located on the goaf side. A filter screen (12) is installed tightly on the goaf side of the polymer panel (2). The steel panel (1), the polymer panel (2), and the filter screen (12) are mechanically anchored and combined by bolts (9) and a pre-set fixing structure (11). A drain valve (10) is embedded in the combined sealing panel. The combined sealing panel is fixedly connected to the steel frame (4). An observation window (3) is provided on the combined sealing panel. The observation window (3) is fixedly connected to the steel frame (4). A monitoring control panel (5) is integrated and installed on the side wall of the roadway. The monitoring control panel (5) is connected to the sensor and actuator through the line. The support frame (6) provided on the steel frame (4) is used to reinforce the connection between the steel frame (4) and the top and bottom plates of the roadway. A water filter chamber (7) is installed at the lower end of the combined sealing panel block. The water filter chamber (7) is connected to the roadway drainage system through the drainage pipe (8). The combined sealing panel has a pipe for water flow.

2. A reusable coal mine backfill retaining wall according to claim 1, characterized in that, The steel panel (1) and the polymer panel (2) are stacked together and connected by countersunk bolts (9) arranged in a matrix.

3. A reusable coal mine backfill retaining wall according to claim 1, characterized in that, The observation window (3) is set in three places, and the three observation windows (3) are equally spaced and arranged in a vertical straight line. The three observation windows (3) are set in the upper, middle and lower parts of the combined sealing plate.

4. A reusable coal mine backfill retaining wall according to claim 1, characterized in that, The steel frame (4) is arranged in a grid pattern.

5. A reusable coal mine backfill retaining wall according to claim 1, characterized in that, The monitoring control panel (5) has a built-in data processing unit and a preset pressure alarm threshold. When the pressure sensor monitoring value exceeds the set threshold, the monitoring control panel (5) can issue an audible and visual alarm and control the pressure relief valve to open.

6. A reusable coal mine backfill retaining wall according to claim 1, characterized in that, The filter chamber (7) is composed of two layers of stainless steel mesh sandwiching geotextile.

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