An underground bag-type filling retaining wall structure and construction process

Abstract

The present application relates to the technical field of filling mining, in particular to a kind of underground bag type filling retaining wall structure and construction technology, the upper layer access is arranged above the lower layer access, the access axis of the upper layer access and the lower layer access is perpendicular;The fixed hook is arranged in the top of access;The top edge and side edge of the filling cloth bag are all provided with suspension fixing hole, the filling cloth bag is hung on the fixed hook;The filling pipe main pipe and filling pipe auxiliary pipe are all arranged in the top of access;The access mouth reinforcement net is arranged in the access mouth position of access;The access interior reinforcement net is arranged in the interior of access;The access filter pipe is arranged in the middle position of the bottom and both sides of access;The access water guide pipe is arranged in the middle position of the bottom, top and both sides of access;The observation top connection pipe and the access exhaust pipe are all arranged in the top of access.The present application significantly improves the safety and overall efficiency of mine filling construction.

Description

Technical Field

[0001] This invention relates to the field of backfill mining technology, specifically to an underground bag-type backfill retaining wall structure and construction process. Background Technology

[0002] Backfilling mining is one of the core technologies in modern mining. It involves injecting cemented backfill slurry into the goaf to form an artificial support structure, effectively supporting the surrounding rock, controlling ground pressure, reducing surface subsidence, and enabling the underground resource utilization of tailings solid waste. It is widely used in large-scale mining. Backfill retaining walls, as key structures in backfilling mining, need to be installed at the entrances of connecting roadways in the goaf. They bear the core functions of preventing slurry leakage, isolating the backfilling area from the production area, and withstanding the lateral dynamic pressure of the slurry. Their structural rationality, ease of construction, and safety directly affect the overall efficiency and operational safety of backfilling mining.

[0003] In existing technologies, the main construction forms of infill retaining walls include cement mortar brick walls, metal prefabricated dehydrated retaining walls, and gabion retaining walls. Although each has its applications, there are still many technical defects and application limitations. Traditional cement mortar brick walls have long construction cycles, high labor requirements, and high material costs. Moreover, they have poor adaptability after molding, making it difficult to fit the uneven surfaces of the access road and prone to grout leakage. Metal prefabricated dehydrated retaining walls have rigid frames that need to be prefabricated according to a preset cross-section. They are not adaptable enough to the fluctuation of roadway dimensions, have poor joint sealing performance, low anchoring efficiency under fractured surrounding rock conditions, and are prone to forming exposed areas at the top of layered roadways, posing a risk of roof collapse.

[0004] To address the aforementioned issues, patent CN103696803B discloses a tailings cemented backfilling retaining wall device for underground mines. This device uses gabion mesh cages filled with mining waste rock, combined with filter cloth and dewatering pipes to construct the retaining wall. While it improves both load-bearing capacity and filtration efficiency, achieving a dewatering capacity 7-10 times that of a concrete sealing wall in the initial filling stage, and offering some optimization in erection speed and construction convenience compared to traditional brick walls, this device still requires a concrete foundation. The on-site filling of the gabion mesh cages with mining waste rock involves a significant amount of work, and the underground construction process remains relatively cumbersome. Furthermore, it only relies on applying... The filter cloth is used for water filtration, but there is no dedicated tiered drainage and pressure release structure. During the slurry solidification process, water accumulation is likely to occur, affecting the quality of the roof connection. Furthermore, there are no dedicated monitoring components for the filling process, making it difficult to accurately control the filling progress. At the same time, the overall support of the device relies solely on the combination of gabion mesh boxes and retaining wall cross timbers, without forming an integrated reinforced filling body structure. During the layered mining process of the downward approach in the mine, the filling body is susceptible to delamination and collapse due to impact loads, and cannot provide stable artificial false roof protection for subsequent mining. Its adaptability to complex underground mining environments still needs to be improved.

[0005] In addition, existing types of backfill retaining walls generally suffer from problems such as simple drainage system design, poor controllability of the backfilling process, and insufficient adaptability of the retaining wall structure to the complex underground environment. Some retaining wall components lack antistatic and flame-retardant protective properties, which can easily cause safety hazards such as fire and leakage during underground operations. Moreover, the construction of most retaining walls still relies on large-scale machinery and equipment, which is labor-intensive and difficult to meet the needs of modern mines for efficient, green and safe backfilling mining. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a downhole bag-type filling retaining wall structure and construction process.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A downhole bag-type filling retaining wall structure includes an upper inlet, a lower inlet, filling bags, a main filling pipe, a secondary filling pipe, a reinforcing mesh at the inlet entrance, a reinforcing mesh inside the inlet, fixing hooks, an inlet filter pipe, an inlet guide pipe, an observation connection pipe, and an inlet vent pipe. The upper inlet is located above the lower inlet, and its axis is perpendicular to that of the lower inlet. The fixing hooks are located at the top inside the inlet. The filling bags have an open top surface structure, and the top edge of the filling bags... The filling bag is suspended from the fixed hooks at both the top and side edges. The main filling pipe and the secondary filling pipe are both located at the top of the inlet. The reinforcing mesh at the inlet is located at the inlet of the inlet. The reinforcing mesh inside the inlet is located inside the inlet. The inlet filter pipe is located at the bottom and the middle of both sides of the inlet. The inlet guide pipe is located at the bottom, top, and the middle of both sides of the inlet. The observation connection pipe and the inlet exhaust pipe are both located at the top of the inlet.

[0008] Furthermore, the upper-layer approach and the lower-layer approach have the same cross-sectional dimensions.

[0009] Furthermore, the dimensions of the filling bag satisfy the following relationship: 1.5D ≤ D r ≤L,H <H r D <W r， Where D is the route width, H is the route height, L is the standard route depth, and W is the standard route depth. r To fill the bag width, H r To fill the bag height, D r The length of the filling bag.

[0010] Furthermore, the main filling pipe and the secondary filling pipe are controlled by a three-way control valve at the inlet. The main filling pipe extends into the depth of the inlet, and the secondary filling pipe extends into the filling bag.

[0011] Furthermore, the steel mesh at the entrance is configured as a crisscross binding structure; the steel mesh inside the entrance is configured as a crisscross structure or a single transverse structure.

[0012] Furthermore, the filling bag and the inlet are equipped with suspension rods and steel mesh false ceilings.

[0013] This invention also includes the following technical solutions: A construction process for the above-mentioned underground bag-type filling retaining wall structure includes the following steps: S1. Preparation: Determine the location and size of the upper and lower access routes, and select filling bags of matching size; drill holes in the top of the access routes, insert the fixing hooks of the steel structure into the holes, and fix them with cement anchoring agent; S2. Constructing the inner steel mesh of the access road: Install the inner steel mesh of the access road inside the access road, connect the ends of the longitudinal and transverse steel bars of the inner steel mesh of the access road to the fixed hooks at the top and the anchor rods fixed in the rock mass on both sides of the access road, and fix them with iron wire. S3. Pipeline binding: Inlet filter pipes are installed at the bottom and middle of the inlet, and PVC protective pipes are installed at the contact points with the filling bags; inlet guide pipes are installed at the bottom, middle and top of the inlet; observation connection pipes and inlet vent pipes are installed at the top of the inlet; the interiors of the inlet guide pipes, observation connection pipes and inlet vent pipes are all lined with wire mesh, and the exterior of the observation connection pipes is wrapped with wire mesh cloth; all pipes are fixed to the fixing hooks with steel wire. S4. Suspension rods, steel mesh false ceiling and filling bags: Lay the filling bags flat in the access road. Starting from one corner of the access road, lay the steel mesh false ceiling and suspension rods in sequence from the inside to the outside. Start fixing the filling bags from one corner of the access road. First, fix the side fixing holes of the filling bags to the steel bars driven into the rock mass. Then fix the top fixing holes of the filling bags to the fixing hooks at the top of the access road. Fix them in sequence from the inside to the vicinity of the access road. The filling bags at the access road are fixed on the outside. If the filling bags are damaged, tie and seal the opening. S5. Constructing the entrance steel mesh: Install the entrance steel mesh at the entrance, connect the ends of the longitudinal and transverse steel bars of the entrance steel mesh to the top cloth bag fixing hooks and the anchor rods fixed in the rock mass on both sides of the entrance, and use iron wire to tie and fix them. S6. Filling the filter bag: The filling slurry is conveyed into the filter bag through the filling pipe branch pipe. The conveying is stopped in time according to the design requirements, and the slurry in the filter bag is allowed to solidify. S7. Inlet filling: Check the solidification strength and sealing of the filling bags. After confirming that there is no pipe blockage, transport the filling slurry into the inner space of the inlet through the main filling pipe. At the same time, discharge excess water in the slurry through the inlet filter pipe and the inlet guide pipe. Monitor the filling progress by observing the jacking pipe. When the filling slurry appears in the jacking pipe, stop the filling operation and complete the retaining wall construction.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a downhole bag-type filling retaining wall structure and construction process. It utilizes a filling bag with an open top surface made of tear-resistant, anti-static, and flame-retardant water-filtering fabric, combined with a size-matched structural design and a 1.5D≤D ratio. r ≤L、H <H r D <W r The parameter control enables low-cost, highly adaptable, and rapid construction of the filling retaining wall, significantly reducing the labor intensity and equipment dependence of underground construction. Utilizing the dual blocking and positioning of the steel mesh at the inlet and inside the inlet, combined with the suspension rods inside and outside the filling bag and the false top reinforcement structure of the steel mesh, the integrity, strength, and anti-delamination ability of the filling body are effectively enhanced, fundamentally eliminating the safety hazard of filling body collapse and detachment during downward inlet mining. Through the zoned conveying design of the main and auxiliary pipes, coupled with the precise control of the three-way control valve, efficient and controllable filling of the filling slurry is achieved, supplemented by the inlet filter pipe and inlet water guide. The dual drainage system of the pipe, along with real-time monitoring and pressure release of the top-connecting pipe and the vent pipe, not only ensures the curing quality and top-connecting effect of the filling material, but also avoids the risks of pipe blockage and wall overload, significantly improving the safety and overall efficiency of mine filling construction. At the same time, all components of this invention are made of readily available materials and have simple installation processes, requiring no large machinery, which facilitates its widespread application and has good economic and social benefits. It effectively solves the industry pain points of high cost, low efficiency, poor safety, and insufficient sealing of traditional filling retaining wall construction, and plays an important role in promoting the technological advancement of modern large-scale mine filling technology. Attached Figure Description

[0015] Figure 1 A schematic diagram of an embodiment of the bag-type filling retaining wall structure of the present invention is shown; Figure 2 A schematic diagram showing the dimensional relationship of the filling bag of the present invention is shown; Figure 3 A front view of an embodiment of the bag-type filling retaining wall structure of the present invention is shown; Figure 4 A side view of an embodiment of the bag-type filling retaining wall structure of the present invention is shown; Figure 5 A process flow diagram of the present invention is shown; Attached diagram descriptions: 1. Upper intake; 2. Lower intake; 3. Filling bag; 4. Main filling pipe; 5. Secondary filling pipe; 6. Inlet steel mesh; 7. Inlet steel mesh; 8. Fixing hook; 9. Inlet filter pipe; 10. Inlet guide pipe; 11. Observation connection pipe; 12. Inlet exhaust pipe. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0017] Reference Appendix Figure 1-4 A downhole bag-type filling retaining wall structure includes an upper inlet 1, a lower inlet 2, a filling bag 3, a main filling pipe 4, a secondary filling pipe 5, a reinforcing mesh at the inlet 6, a reinforcing mesh inside the inlet 7, a fixing hook 8, an inlet filter pipe 9, an inlet water guide pipe 10, an observation connection pipe 11, and an inlet vent pipe 12. The upper inlet 1 is located above the lower inlet 2, and the inlet axis of the upper inlet 1 is perpendicular to that of the lower inlet 2. The fixing hook 8 is located at the top inside the inlet. The filling bag 3 has an open top structure, and the filling cloth... The top and side edges of the bag 3 are provided with hanging and fixing holes, and the filling bag 3 is hung on the fixing hook 8; the main filling pipe 4 and the secondary filling pipe 5 are both located at the top of the inlet; the inlet steel mesh 6 is located at the inlet of the inlet; the inner steel mesh 7 is located inside the inlet; the inlet filter pipe 9 is located at the bottom of the inlet and the middle of both sides; the inlet guide pipe 10 is located at the bottom, top and the middle of both sides of the inlet; the observation top pipe 11 and the inlet exhaust pipe 12 are both located at the top of the inlet.

[0018] In one embodiment of the present invention, the upper access route 1 and the lower access route 2 have the same access cross-sectional dimensions.

[0019] In one embodiment of the present invention, the dimensions of the filling bag 3 satisfy the following relationship: 1.5D≤D r ≤L,H <H r D <W r， Where D is the route width, H is the route height, L is the standard route depth, and W is the standard route depth. r To fill the bag width, H r To fill the bag height, D r The length of the filling bag is specified. The width and height of the filling bag 3 must be greater than the access road to accommodate the unevenness of the access road's inner surface, ensuring that the filling bag fits tightly against the access road wall and forms a good seal. The length of the filling bag 3 should exceed one and a half times the width of the access road. This effectively prevents delamination of the filling material even during the mining of the next layer of access road, ensuring the stability of the overall structure. The filling bag 3 is made of tear-resistant, anti-static, and flame-retardant filter fabric, possessing high mechanical strength and durability, enabling long-term stable operation in harsh underground environments. The filling bag 3 adopts an open top structure, facilitating the injection of filling slurry.

[0020] In one embodiment of the present invention, the main filling pipe 4 and the secondary filling pipe 5 are controlled by a three-way control valve at the inlet. The main filling pipe 4 extends deep into the inlet, and the secondary filling pipe 5 extends into the filling bag 3. Both the main filling pipe 4 and the secondary filling pipe 5 are made of PVC. The main filling pipe 4 is mainly used to transport filling slurry into the internal space of the inlet. Its length extends deep into the inlet, ensuring that the filling slurry can be evenly distributed throughout the entire inlet range to achieve the ideal filling effect. The secondary filling pipe 5 is used to transport filling slurry into the internal space of the filling bag. Its length extends into the filling bag, allowing the filling bag to be fully filled, enhancing the overall density and stability of the filling body. The slurry transport of both the main filling pipe 4 and the secondary filling pipe 5 is controlled by the three-way control valve at the inlet. During the filling operation, the working state of the main filling pipe and the secondary filling pipe can be flexibly switched by operating the three-way control valve, realizing effective management of the filling slurry transport path.

[0021] In one embodiment of the invention, the inlet reinforcement mesh 6 is configured as a crisscross binding structure; the inner reinforcement mesh 7 is configured as a crisscross structure or a single transverse structure. The inlet reinforcement mesh 6, located at the inlet, is mainly composed of reinforcing bars and wires, and is fixed by anchor bolts pre-fixed at the top and sides of the inlet to form a stable support system. During the filling operation, the main task of the inlet reinforcement mesh 6 is to prevent the filling bag from shifting outwards, preventing it from leaving its predetermined position due to gravity or other external forces, thereby ensuring that the filling slurry can accurately enter the designated area. The inner reinforcement mesh 7 is also composed of reinforcing bars and wires, and can be configured as a crisscross structure or a single transverse structure depending on the actual situation. The inner reinforcement mesh 7 is fixed by anchor bolts pre-fixed at the top and sides of the inlet, thus preventing the filling bag from shifting inwards. During the filling process, the inner reinforcement mesh 7 effectively restricts the range of motion of the filling bag, ensuring that the filling bag adheres tightly to the inlet wall, forming a good sealing effect. Furthermore, the steel mesh 7 inside the access road enhances the integrity and stability of the filling material, preventing delamination or collapse during subsequent mining operations. The combined use of the steel mesh 6 at the access point and the steel mesh 7 inside the access road forms a comprehensive support system, fully ensuring the safety and effectiveness of the filling operation. These two types of steel mesh not only effectively control the displacement of the filling bags but also significantly improve the overall structural strength of the filling material, providing a solid guarantee for the construction of the underground filling retaining wall.

[0022] In one embodiment of the invention, suspension rods and a steel mesh false roof are suspended inside the filling bag 3 and the inlet. The suspension rods are suspension components made of steel bars, fixed to the top of the inlet by fixing hooks 8, used to support and fix the filling bag. The steel mesh false roof is a planar structure composed of a crisscrossing steel mesh, laid at the bottom and around the filling bag 3, forming a stable support frame. The main function of the suspension rods and the steel mesh false roof is to enhance the integrity and strength of the filling body. During the filling process, filling slurry is injected into the filling bag, forming a filling body of a certain thickness. Without the support of the suspension rods and the steel mesh false roof, the filling body may deform or delaminate due to its own weight or external pressure, seriously affecting the filling effect and structural stability. Through the combined support of the suspension rods and the steel mesh false roof, the stress on the filling body can be effectively distributed, increasing its overall stiffness and compressive strength, and preventing delamination and collapse accidents.

[0023] The fixing hook 8 is an important structural component used to suspend and fix various key components in this invention. The installation steps for fixing hook 8 are as follows: First, determine the installation position of the fixing hook, and then use a drilling machine to drill a hole at the selected position. The hole diameter should be slightly larger than the diameter of the fixing hook to ensure that the hook can be inserted smoothly. Insert the fixing hook into the pre-drilled hole, ensuring that the hook part faces downwards to facilitate the suspension of subsequent components. Next, fill the hole with cement anchoring agent to firmly fix the fixing hook. Cement anchoring agent has strong adhesion and curing speed, and can form a stable fixing effect in a short time. After the cement anchoring agent has completely cured, check whether the fixing hook is firm and whether there is any looseness or tilting. If necessary, the position of the hook can be adjusted appropriately to ensure that it is in the optimal state.

[0024] The inlet filter pipe 9 is located at the bottom and middle of both sides of the inlet, and is fixed to the fixing hook 8 with steel wire. This arrangement ensures that the filter pipe covers the entire bottom and sides of the inlet, maximizing the collection and drainage of moisture from the filling slurry. The inlet filter pipe 9 extends from the depth of the inlet to the inlet opening, forming a complete drainage channel to ensure smooth drainage of moisture. The inlet filter pipe is made of a fully filtration material, allowing water to pass through freely while effectively blocking solid particles, ensuring that moisture in the filling slurry can be drained quickly without affecting the overall structural stability of the filling body. To prevent the weight of the slurry inside the filling bag 3 from compressing the filter pipe and causing deformation or even damage, the filter pipe is protected by an external PVC pipe.

[0025] The inlet water pipe 10 is located at the bottom, top, and middle of both sides of the inlet, and is fixed to the fixing hook 8 with steel wire. This multi-directional arrangement ensures that the inlet water pipe 10 covers the entire inlet space, maximizing the collection and drainage of moisture from the filling slurry. The inlet water pipe 10 extends from the depth of the inlet to the inlet opening, forming a complete drainage channel to ensure smooth drainage of moisture. The inlet water pipe 10 is made of pressure-resistant material, capable of withstanding the pressure of the filling slurry inside the filter bag, preventing deformation or damage due to external forces, and ensuring that the inlet water pipe 10 remains unobstructed during the filling process, unaffected by the internal pressure of the filling body.

[0026] The observation jacking pipe 11 is installed at the top of the intake and fixed to the fixing hook 8 with steel wire, facilitating real-time monitoring of the rise of the filling slurry. The observation jacking pipe extends from the depth of the intake to the intake opening, forming a clearly visible observation channel, allowing ground personnel to easily monitor the filling progress. The outer side of the observation jacking pipe 11 is wrapped with a layer of wire mesh to prevent solid particles in the filling slurry from clogging the pipe and ensuring unobstructed observation; it also increases the structural strength of the pipe, preventing damage from external impacts or compression. When ground personnel observe filling slurry overflowing through the observation jacking pipe, it indicates that the filling operation is nearing completion. At this point, ground personnel should immediately stop the filling operation to avoid overfilling, which could lead to excessive internal pressure in the filling body and structural instability.

[0027] The intake vent pipes 12 are all located at the top of the intake and fixed to the fixing hooks 8 with steel wires. This ensures that the vent pipes are located at the highest point of the filling operation, facilitating the timely discharge of gases generated during the filling process. The vent pipes extend from the depth of the intake to the intake opening, forming an unobstructed exhaust channel to ensure rapid gas discharge. The inner side of the intake vent pipes 12 is wrapped with a layer of wire mesh to prevent solid particles in the filling slurry from entering the vent pipes and causing blockages. During the filling operation, as the filling slurry is continuously injected, the intake will gradually fill with a mixture of liquid and gas. If the gas is not discharged in time, the pressure inside the filling body will continue to increase, which may lead to instability in the filling body structure and even safety accidents. The continuous venting through the intake vent pipes 12 can significantly reduce the pressure inside the filling body, ensuring the safety and stability of the filling operation.

[0028] Reference Appendix Figure 5 A construction process for the above-mentioned underground bag-type filling retaining wall structure includes the following steps: S1. Preparation: Determine the position and size of the upper access route 1 and the lower access route 2, and select filling bags 3 of matching size; Drill holes at the top of the access routes, insert the fixing hooks 8 of the steel structure into the holes and fix them with cement anchoring agent; S2. Constructing the inner steel mesh of the access road: Install the inner steel mesh 7 inside the access road, connect the ends of the longitudinal and transverse steel bars of the inner steel mesh 7 to the fixed hooks 8 at the top and the anchor rods fixed in the rock mass on both sides of the access road, and use wire to tie and fix them. S3. Pipeline binding: Inlet filter pipes 9 are installed at the bottom and middle of the inlet, and PVC protective pipes are installed at the contact points with the filling bag 3; inlet guide pipes 10 are installed at the bottom, middle and top of the inlet; observation connection pipe 11 and inlet vent pipe 12 are installed at the top of the inlet. The inlet guide pipe 10, observation connection pipe 11 and inlet vent pipe 12 are all equipped with wire mesh inside, and the observation connection pipe 11 is wrapped with wire mesh cloth; all pipelines are fixed to the fixing hooks 8 with steel wire. S4. Suspension rods, steel mesh false ceiling and filling bags: Lay the filling bags 3 flat in the access road. From the inner corner of the access road, lay the steel mesh false ceiling and suspension rods in sequence from the inside to the outside. Starting from the inner corner of the access road, fix the filling bags 3. First, fix the side fixing holes of the filling bags 3 to the steel bars driven into the rock mass. Then fix the top fixing holes of the filling bags 3 to the fixing hooks 8 at the top of the access road. Fix them in sequence from the inside to the vicinity of the access road. The filling bags 3 at the access road are fixed on the outside. If the filling bags 3 are damaged, tie and seal the opening. S5. Constructing the entrance steel mesh: Install the entrance steel mesh 6 at the entrance, connect the ends of the longitudinal and transverse steel bars of the entrance steel mesh 6 to the top cloth bag fixing hooks 8 and the anchor rods fixed in the rock mass on both sides of the entrance, and use wire to tie and fix them. S6. Filling the filter bag: The filling slurry is conveyed into the filter bag 3 through the filling pipe 5. The conveying is stopped in time according to the design requirements, and the slurry in the filter bag 3 is allowed to solidify. S7. Inlet filling: Check the solidification strength and sealing of the filling bag 3. After confirming that there is no pipe blockage, transport the filling slurry into the inner space of the inlet through the main filling pipe 4. At the same time, discharge the excess water in the slurry through the inlet filter pipe 9 and the inlet guide pipe 10. Monitor the filling progress by observing the jacking pipe 11. When the filling slurry appears in the jacking pipe 11, stop the filling operation and complete the retaining wall construction.

[0029] This invention provides a downhole bag-type filling retaining wall structure and construction process. It utilizes a filling bag with an open top surface made of tear-resistant, anti-static, and flame-retardant water-filtering fabric, combined with a size-matched structural design and a 1.5D≤D ratio. r ≤L、H <H r D <W rThe parameter control enables low-cost, highly adaptable, and rapid construction of the filling retaining wall, significantly reducing the labor intensity and equipment dependence of underground construction. Utilizing the dual blocking and positioning of the steel mesh at the inlet and inside the inlet, combined with the suspension rods inside and outside the filling bag and the false top reinforcement structure of the steel mesh, the integrity, strength, and anti-delamination ability of the filling body are effectively enhanced, fundamentally eliminating the safety hazard of filling body collapse and detachment during downward inlet mining. Through the zoned conveying design of the main and auxiliary pipes, coupled with the precise control of the three-way control valve, efficient and controllable filling of the filling slurry is achieved, supplemented by the inlet filter pipe and inlet water guide. The dual drainage system of the pipe, along with real-time monitoring and pressure release of the top-connecting pipe and the vent pipe, not only ensures the curing quality and top-connecting effect of the filling material, but also avoids the risks of pipe blockage and wall overload, significantly improving the safety and overall efficiency of mine filling construction. At the same time, all components of this invention are made of readily available materials and have simple installation processes, requiring no large machinery, which facilitates its widespread application and has good economic and social benefits. It effectively solves the industry pain points of high cost, low efficiency, poor safety, and insufficient sealing of traditional filling retaining wall construction, and plays an important role in promoting the technological advancement of modern large-scale mine filling technology.

[0030] The foregoing descriptions have outlined some exemplary embodiments of the present invention. It is understood that these embodiments are merely illustrative and do not constitute a limitation on the scope of protection of the present invention. Features in these embodiments can be rearranged in suitable ways, and the resulting solutions remain within the scope of protection claimed by the present invention. All other embodiments obtained by those skilled in the art based on the foregoing embodiments without inventive effort, i.e., all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by the present invention.

Claims

1. A downhole bag-type filling retaining wall structure, characterized in that, The system includes an upper inlet (1), a lower inlet (2), a filling bag (3), a main filling pipe (4), a secondary filling pipe (5), a steel mesh at the inlet (6), a steel mesh inside the inlet (7), a fixing hook (8), an inlet filter pipe (9), an inlet guide pipe (10), an observation top pipe (11), and an inlet exhaust pipe (12). The upper inlet (1) is located above the lower inlet (2), and the upper inlet (1) is perpendicular to the inlet axis of the lower inlet (2). The fixing hook (8) is located at the top inside the inlet. The filling bag (3) has an open top structure. 3) The top edge and side edge are provided with hanging fixing holes, and the filling bag (3) is suspended on the fixing hook (8); the main filling pipe (4) and the secondary filling pipe (5) are both set at the top of the inlet; the inlet steel mesh (6) is set at the inlet of the inlet; the inner steel mesh (7) is set inside the inlet; the inlet filter pipe (9) is set at the bottom and the middle of both sides of the inlet; the inlet guide pipe (10) is set at the bottom, top and the middle of both sides of the inlet; the observation top pipe (11) and the inlet exhaust pipe (12) are both set at the top of the inlet.

2. The downhole bag-type filling retaining wall structure according to claim 1, characterized in that, The upper access route (1) and the lower access route (2) have the same access cross-sectional dimensions.

3. The downhole bag-type filling retaining wall structure according to claim 1, characterized in that, The dimensions of the filling bag (3) satisfy the following relationship: 1.5D≤D r ≤L,H <H r D <W r， Where D is the route width, H is the route height, L is the standard route depth, and W is the standard route depth. r To fill the bag width, H r To fill the bag height, D r The length of the filling bag.

4. The downhole bag-type filling retaining wall structure according to claim 1, characterized in that, The main filling pipe (4) and the secondary filling pipe (5) are controlled by a three-way control valve at the inlet. The main filling pipe (4) extends to the depth of the inlet, and the secondary filling pipe (5) extends into the filling bag (3).

5. The downhole bag-type filling retaining wall structure according to claim 1, characterized in that, The steel mesh (6) at the entrance is configured as a crisscross binding structure; the steel mesh (7) inside the entrance is configured as a crisscross structure or a single transverse structure.

6. The downhole bag-type filling retaining wall structure according to claim 1, characterized in that, The filling bag (3) and the inlet are equipped with hanging rods and steel mesh false ceilings.

7. A construction process for a downhole bag-type filling retaining wall structure as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Preparation: Determine the position and size of the upper access road (1) and the lower access road (2), and select a filling bag (3) of matching size; Drill holes at the top of the access road, insert the fixing hook (8) of the steel structure into the holes and fix it with cement anchoring agent; S2. Constructing the inner steel mesh of the access road: Install the inner steel mesh (7) inside the access road, connect the ends of the longitudinal and transverse steel bars of the inner steel mesh (7) to the fixed hooks (8) at the top and the anchor rods fixed in the rock mass on both sides of the access road, and use wire to tie and fix them. S3. Binding the pipeline: Inlet filter pipe (9) is installed at the bottom and middle of the inlet, and PVC protective pipe is installed at the contact part with the filling bag (3); inlet guide pipe (10) is installed at the bottom, middle and top of the inlet, and observation top pipe (11) and inlet exhaust pipe (12) are installed at the top of the inlet. The inlet guide pipe (10), observation top pipe (11) and inlet exhaust pipe (12) are all equipped with wire mesh inside, and the observation top pipe (11) is wrapped with wire mesh cloth outside; all pipelines are fixed to the fixed hook (8) by steel wire. S4, Suspension rods, steel mesh false top and filling bags: Lay the filling bags (3) flat in the access road, and lay the steel mesh false top and suspension rods from the inside to the outside from one corner of the access road; fix the filling bags (3) from one corner of the access road, first fix the side fixing holes of the filling bags (3) to the steel bars driven into the rock mass, and then fix the top fixing holes of the filling bags (3) to the fixing hooks (8) at the top of the access road, fix them from the inside to the outside until near the access road entrance, and fix the filling bags (3) at the access road entrance on the outside. If the filling bags (3) are damaged, tie and seal the opening. S5. Constructing the entrance steel mesh: Install the entrance steel mesh (6) at the entrance, connect the ends of the longitudinal and transverse steel bars of the entrance steel mesh (6) to the top cloth bag fixing hook (8) and the anchor rods fixed in the rock mass on both sides of the entrance, and use wire to tie and fix them. S6. Filling the bag: The filling slurry is conveyed into the filling bag (3) through the filling pipe sub-pipe (5). The conveying is stopped in time according to the design requirements and the slurry in the filling bag (3) is allowed to solidify. S7. Inlet filling: Check the solidification strength and sealing of the filling bag (3). After confirming that there is no pipeline blockage, the filling slurry is transported into the inner space of the inlet through the main filling pipe (4). At the same time, excess water in the slurry is discharged through the inlet filter pipe (9) and the inlet guide pipe (10). The filling progress is monitored by observing the top connection pipe (11). When the filling slurry appears in the top connection pipe (11), the filling operation is stopped and the retaining wall construction is completed.

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