Small coal pillar control device suitable for gob-side entry driving under influence of overlying remaining coal pillars

Abstract

The invention relates to the technical field of underground mine roadway support, in particular to a gob-side entry driving small coal pillar control device suitable for influence of overlying remaining coal pillars, which comprises an operation groove formed in the inner side of a roadway in a coal rock mass, a concrete slab is poured in the operation groove, and a plurality of through holes are formed in the concrete slab and the coal rock mass. The through holes penetrate through two adjacent roadways; according to the grouting device, the grouting pipes are installed in the through holes, then the outer ends of the grouting pipes are fixed through the nuts and the connecting parts, then grouting is conducted in the grouting pipes, and after grouting is completed, the grouting pipes are fixed through the nuts and the connecting parts. The inner protection plate, the air bag and the outer protection plate are sequentially installed at the outer end of the grouting pipe from inside to outside, finally, the outer protection plate is fixed through the fixing part, finally, the air bag is inflated, the air bag expands inwards, the side wall of the inner end of a roadway is comprehensively supported, and the coal rock mass is well maintained and reinforced.

Description

Technical Field

[0001] This invention relates to the field of underground mine roadway support technology, specifically to a device for controlling small coal pillars in goaf-drilled roadways under the influence of overlying residual coal pillars. Background Technology

[0002] When two roadways are excavated simultaneously during dual-roadway excavation, the lower section of the roadway is subjected to disturbances from two mining operations, resulting in poor overall stability and a high risk of large deformations in the reused roadway. Upon entering deeper mining, the high ground stress level and the strong mining impact at the working face lead to significant mine pressure in the roadways, causing coal and rock mass fracturing, coal wall spalling, severe roof and floor deformation, and extremely difficult roadway maintenance. Therefore, improving the bearing capacity of the coal and rock mass is crucial.

[0003] Currently, grouting reinforcement and anchor cable support are the main technical measures to improve the stability of coal and rock masses. However, existing coal and rock mass reinforcement methods have the following drawbacks: 1. Traditional through-anchor cable support relies on the rigid lateral restraint of the coal and rock mass on both sides, while ordinary anchor cable support is ineffective and cannot effectively maintain the coal and rock mass; 2. Coal and rock mass fissures are well-developed and conductive, and traditional grouting cannot densely adhere to the surface of the coal and rock mass, resulting in poor sealing. Leakage frequently occurs during traditional grouting construction, such as grouting pipes and grouting anchor cables, making it difficult to guarantee the reinforcement effect of the coal and rock mass and greatly affecting the quality of grouting reinforcement construction. Summary of the Invention

[0004] The purpose of this invention is to provide a control device for small coal pillars in roadways under the influence of overlying residual coal pillars, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a control device for small coal pillars in roadways under the influence of overlying residual coal pillars, comprising: an operating slot opened inside the roadway in the coal and rock mass, a concrete slab poured in the operating slot, and several through holes opened on both the concrete slab and the coal and rock mass, the through holes penetrating two adjacent roadways; Each through hole is fitted with a grouting pipe. Several fine holes are evenly opened on the side wall of the grouting pipe. Sealing rings are fixedly installed on the outer walls of both ends of the grouting pipe. The outer wall of the sealing ring is in close contact with the inner wall of the through hole. A steel cage is installed at the inner end of the grouting pipe. A sealing plate is fixedly installed on the inner side of one end of the grouting pipe. An external threaded pipe is threadedly connected to the inner side of the other end. A one-way valve is fixedly installed at the outer end of the external threaded pipe. Both ends of the grouting pipe pass through the concrete slab and are fitted with support plates and threaded nuts. The outer ends of two adjacent grouting pipes are fixed together by connecting components. The outer end of the grouting pipe is equipped with an inner protective plate, the outer end of which is fixedly installed with an airbag, and the outer end of which is equipped with an outer protective plate. The outer protective plate is fixed in the roadway by fixing components.

[0006] Preferably, the reinforcing cage includes several reinforcing bars and several support plates. The support plates are circular and have several through holes evenly distributed on them. The reinforcing bars pass through the through holes and are fixedly welded.

[0007] Preferably, a retaining ring is fixedly installed at the inner end of the external threaded tube. Several circular holes are evenly opened on the side wall of the retaining ring. The diameter of the circular holes is smaller than the diameter of the reinforcing bar. One end of the reinforcing bar cage is in contact with the sealing plate, and the other end is in contact with the retaining ring.

[0008] Preferably, threaded grooves are provided at both ends of the grouting pipe. The threaded grooves are located on the outside of the sealing ring and the concrete slab, and the inner wall of the nut is threaded to the outer wall of the threaded groove.

[0009] Preferably, the connecting component includes several connecting rods, one end of which is fixedly fitted with a connecting ring, and the other end of which is uniformly fitted with several teeth. The two connecting rings are respectively diagonally fitted onto the outer ends of the two grouting pipes. The connecting rings are located between the nut and the support plate, and the teeth on the two connecting rods are allowed to mesh with each other.

[0010] Preferably, a U-shaped clip is sleeved on the outer side of the connecting rod, and the inner walls of both ends of the U-shaped clip contact the outer walls of the two connecting rods respectively and limit their movement. The U-shaped clip is fixed to the outer wall of the connecting rod by screws.

[0011] Preferably, the inner end of the inner protective plate is attached to the outer end of the grouting pipe, and the inner protective plate is located in the operating groove and slides in contact with the inner walls of the four ends of the operating groove.

[0012] Preferably, an inflation / deflation tube is fixedly installed at one end of the airbag, the airbag is attached to the inner wall of the inner end of the roadway, and the outer protective plate is attached to the outer side of the airbag.

[0013] Preferably, the fixing components include concrete blocks and retaining bars uniformly poured on the inner walls of the four ends of the tunnel. The middle part of the concrete block is reserved with an insertion groove. The concrete blocks at the upper and lower ends of the tunnel and the concrete blocks at the left and right ends are not on the same horizontal line.

[0014] Preferably, a plug block is inserted into the plug slot, a base plate is fixedly installed on the upper end of the plug block, a side plate is fixedly installed on one side of the upper end of the base plate, a threaded rod is threaded to one end of the side plate, the threaded rod passes through the side wall of the side plate and a push block is fixedly installed thereon, a stop bar is located between the base plate and the side plate, and the push block pushes the stop bar to contact the outer protective plate and the stop bars to contact each other.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention involves installing a grouting pipe inside a through hole, then fixing the outer end of the grouting pipe with nuts and connecting components. Grout is then injected into the grouting pipe. After grouting, an inner protective plate, an airbag, and an outer protective plate are installed sequentially from the inside out at the outer end of the grouting pipe. Finally, the outer protective plate is fixed with fixing components. The airbag is then inflated, expanding inward to provide comprehensive support to the inner sidewall of the roadway, effectively protecting and reinforcing the coal and rock mass. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the tunnel and operating slot structure of the present invention; Figure 3 This is a schematic diagram of the structure of the airbag during installation of the present invention; Figure 4 This is a schematic diagram of structure two during airbag installation of the present invention; Figure 5 This is a schematic diagram of the outer end structure of the concrete slab of the present invention; Figure 6 This is a schematic diagram showing the partial structure of the present invention.

[0017] In the diagram: 1. Coal and rock mass; 2. Roadway; 3. Operating slot; 4. Concrete slab; 5. Through hole; 6. Grouting pipe; 7. Fine hole; 8. Threaded groove; 9. Sealing ring; 10. Sealing plate; 11. Reinforcing bar; 12. Support plate; 13. External threaded pipe; 14. One-way valve; 15. Retaining ring; 16. Support plate; 17. Nut; 18. Connecting rod; 19. Connecting ring; 20. Tooth; 21. U-shaped clamp; 22. Concrete block; 23. Insertion groove; 24. Bottom plate; 25. Side plate; 26. Threaded rod; 27. Push block; 28. Insertion block; 29. ​​Airbag; 30. Outer protective plate; 31. Stop bar; 32. Inner protective plate. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0019] Please see Figures 1 to 6This invention provides a technical solution: a control device for small coal pillars in roadways excavated along the goaf under the influence of overlying residual coal pillars, comprising: an operating slot 3 opened inside a roadway 2 within a coal and rock mass 1; roadways 2 are provided on both the left and right sides of the coal and rock mass 1; the operating slot 3 is opened on the inner end sidewall of the roadway 2; a concrete slab 4 is poured inside the operating slot 3 to protect it from collapse; several through holes 5 are opened on both the concrete slab 4 and the coal and rock mass 1, the through holes 5 penetrating two adjacent roadways 2; and a filling device is inserted into each through hole 5. The grouting pipe 6 has several fine holes 7 evenly distributed on its side wall. Sealing rings 9 are fixedly installed on the outer walls of both ends of the grouting pipe 6. The outer wall of the sealing ring 9 is in close contact with the inner wall of the through hole 5. The sealing ring 9 is located on the left and right sides of the fine holes 7. The sealing ring 9 seals the grouting pipe 6 and the through hole 5. When concrete slurry is injected into the grouting pipe 6, the concrete slurry will overflow from the fine holes 7 to fill the gap between the through hole 5 and the grouting pipe 6. It can also fill and repair the cracks in the coal and rock mass 1 near the through hole 5, and improve the structure of the coal and rock mass 1.

[0020] A reinforcing cage is installed at the inner end of the grouting pipe 6. The reinforcing cage includes several reinforcing bars 11 and several support plates 12. The support plates 12 are circular and have several small holes evenly distributed on them. The reinforcing bars 11 pass through the small holes and are fixedly welded. A sealing plate 10 is fixedly installed on the inner side of one end of the grouting pipe 6, and an external threaded pipe 13 is threadedly connected to the inner side of the other end. The outer wall of the external threaded pipe 13 is threadedly connected to the inner wall of the grouting pipe 6. A one-way valve 14 is fixedly installed at the outer end of the external threaded pipe 13, and a retaining ring 15 is fixedly installed at the inner end of the external threaded pipe 13. Several circular holes are evenly distributed on the side wall of the retaining ring 15. The diameter of the circular holes is smaller than the diameter of the reinforcing bars 11. One end of the reinforcing cage contacts the sealing plate 10, and the other end contacts the retaining ring 15 to limit the movement of the reinforcing cage. Then, grout is injected into the grouting pipe 6. The reinforcing cage strengthens the concrete structure after grouting.

[0021] Both ends of the grouting pipe 6 are provided with threaded grooves 8. The threaded grooves 8 are located on the outside of the sealing ring 9 and the concrete slab 4. The inner wall of the nut 17 is threadedly connected to the outer wall of the threaded groove 8. Both ends of the grouting pipe 6 pass through the concrete slab 4 and are fitted with support plates 16 and threadedly connected with nuts 17 to fix the grouting pipe 6. The outer ends of two adjacent grouting pipes 6 are fixed together by connecting parts to increase the connection strength between the grouting pipe 6 and the concrete slab 4.

[0022] The connecting component includes several connecting rods 18. A connecting ring 19 is fixedly installed at one end of the connecting rod 18, and several teeth 20 are evenly fixedly installed on the outer side of the other end. Two connecting rings 19 are respectively diagonally sleeved on the outer ends of two grouting pipes 6. The connecting rings 19 are located between the nut 17 and the support plate 16, and the teeth 20 on the two connecting rods 18 are interlocked. A U-shaped clip 21 is sleeved on the outer side of the connecting rod 18. The inner walls of the two ends of the U-shaped clip 21 contact the outer walls of the two connecting rods 18 respectively and limit their movement. The U-shaped clip 21 is fixed to the outer wall of the connecting rod 18 by screws, so that the outer ends of the two diagonally opposite grouting pipes 6 are fixed together, resulting in stronger stability.

[0023] An inner protective plate 32 is provided at the outer end of the grouting pipe 6. An airbag 29 is fixedly installed at the outer end of the inner protective plate 32. The inner end of the inner protective plate 32 is attached to the outer end of the grouting pipe 6. The inner protective plate 32 is located in the operating groove 3 and slides in contact with the inner walls of the four ends of the operating groove 3. The inner protective plate 32 separates the grouting pipe 6, connecting rod 18 and other components from the airbag 29 to prevent the airbag 29 from being punctured. An inflation / deflation pipe is fixedly installed at one end of the airbag 29 to inflate and deflate the airbag 29. The airbag 29 is attached to the inner wall of the inner end of the roadway 2 to support the inner side wall of the roadway 2. The airbag 29 is easy and quick to install, has a short construction period, and can be reused. An outer protective plate 30 is provided at the outer end of the airbag 29 to protect the outer end of the airbag 29. The outer protective plate 30 is fixed in the roadway 2 by a fixing component.

[0024] The fixing components include concrete blocks 22 and retaining bars 31 uniformly poured on the inner walls of the four ends of the tunnel 2. The middle part of the concrete block 22 has a pre-reserved insertion groove 23. The concrete blocks 22 at the upper and lower ends of the tunnel 2 and the concrete blocks 22 at the left and right ends are not on the same horizontal line. Insertion blocks 28 are inserted into the insertion groove 23. A base plate 24 is fixedly installed on the upper end of the insertion block 28. A side plate 25 is fixedly installed on one side of the upper end of the base plate 24. A threaded rod 26 is threadedly connected to one end of the side plate 25. The threaded rod 26 passes through the side wall of the side plate 25 and is fixedly installed with the push block 27. The stop rod 31 is located between the bottom plate 24 and the side plate 25. The push block 27 pushes the stop rod 31 to contact the outer protective plate 30 and the stop rod 31 to contact each other, thus fixing the outer protective plate 30. The outer protective plate 30 limits the airbag 29 and inflates the airbag 29. The airbag 29 provides comprehensive support to the inner end side wall of the roadway 2. The structure is stable, construction is convenient and fast, the construction cycle is short, and it can be recycled.

[0025] When this device is in operation, the grouting pipe 6 is installed in the through hole 5, and then the outer end of the grouting pipe 6 is fixed by the nut 17 and the connecting component. Then, grout is injected into the grouting pipe 6. After the grouting is completed, the inner protective plate 32, the air bag 29 and the outer protective plate 30 are installed sequentially from the inside to the outside of the outer end of the grouting pipe 6. Finally, the outer protective plate 30 is fixed by the fixing component. Finally, the air bag 29 is inflated and expands inward to provide comprehensive support for the inner sidewall of the roadway 2.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A control device for small coal pillars in roadways under the influence of overlying residual coal pillars, characterized in that: include: An operating slot (3) is set inside the roadway (2) in the coal and rock mass (1). A concrete slab (4) is poured inside the operating slot (3). Several through holes (5) are set on both the concrete slab (4) and the coal and rock mass (1). The through holes (5) penetrate two adjacent roadways (2). Each through hole (5) is fitted with a grouting pipe (6). Several fine holes (7) are evenly opened on the side wall of the grouting pipe (6). Sealing rings (9) are fixedly installed on the outer walls of both ends of the grouting pipe (6). The outer wall of the sealing ring (9) is in close contact with the inner wall of the through hole (5). A steel cage is installed at the inner end of the grouting pipe (6). A sealing plate (10) is fixedly installed on the inner side of one end of the grouting pipe (6). An external threaded pipe (13) is threadedly connected to the inner side of the other end. A one-way valve (14) is fixedly installed at the outer end of the external threaded pipe (13). Both ends of the grouting pipe (6) pass through the concrete slab (4) and are fitted with a support plate (16) and a nut (17) is threadedly connected. The outer ends of two adjacent grouting pipes (6) are fixed together by connecting parts. The outer end of the grouting pipe (6) is provided with an inner protective plate (32), and an airbag (29) is fixedly installed at the outer end of the inner protective plate (32). The outer end of the airbag (29) is provided with an outer protective plate (30), and the outer protective plate (30) is fixed in the roadway (2) by a fixing component.

2. The device for controlling small coal pillars in goaf-side excavation roadways under the influence of overlying residual coal pillars, as described in claim 1, is characterized in that: The steel cage includes several steel bars (11) and several support plates (12). The support plates (12) are circular and have several through holes evenly distributed on them. The steel bars (11) pass through the through holes and are fixedly welded.

3. The device for controlling small coal pillars in goaf-side excavation roadways under the influence of overlying residual coal pillars, as described in claim 1, is characterized in that: The inner end of the external threaded tube (13) is fixedly installed with a retaining ring (15). Several round holes are evenly opened on the side wall of the retaining ring (15). The diameter of the round holes is smaller than the diameter of the reinforcing bar (11). One end of the reinforcing bar cage is in contact with the sealing plate (10), and the other end is in contact with the retaining ring (15).

4. The device for controlling small coal pillars in goaf-side excavation roadways under the influence of overlying residual coal pillars, as described in claim 1, is characterized in that: Both ends of the grouting pipe (6) are provided with threaded grooves (8). The threaded grooves (8) are located on the outside of the sealing ring (9) and the concrete slab (4). The inner wall of the nut (17) is threadedly connected to the outer wall of the threaded grooves (8).

5. A control device for small coal pillars in goaf-side excavation roadways under the influence of overlying residual coal pillars, as described in claim 1, characterized in that: The connecting component includes several connecting rods (18). A connecting ring (19) is fixedly installed at one end of the connecting rod (18), and several teeth (20) are evenly fixedly installed on the outer side of the other end. The two connecting rings (19) are respectively diagonally sleeved on the outer ends of the two grouting pipes (6). The connecting rings (19) are located between the nut (17) and the support plate (16), and the teeth (20) on the two connecting rods (18) are interlocked.

6. A control device for small coal pillars in goaf excavation roadways under the influence of overlying residual coal pillars, as described in claim 5, characterized in that: A U-shaped clip (21) is sleeved on the outside of the connecting rod (18). The inner walls of the two ends of the U-shaped clip (21) contact the outer walls of the two connecting rods (18) respectively and limit their movement. The U-shaped clip (21) is fixed to the outer wall of the connecting rod (18) by screws.

7. The device for controlling small coal pillars in goaf-side excavation roadways under the influence of overlying residual coal pillars according to claim 1, characterized in that: The inner end of the inner protective plate (32) is attached to the outer end of the grouting pipe (6), and the inner protective plate (32) is located in the operating groove (3) and slides in contact with the inner walls of the four ends of the operating groove (3).

8. A control device for small coal pillars in goaf-side excavation roadways under the influence of overlying residual coal pillars, as described in claim 1, characterized in that: One end of the airbag (29) is fixedly equipped with an inflation / deflation tube. The airbag (29) is attached to the inner wall of the inner end of the tunnel (2), and the outer protective plate (30) is attached to the outer side of the airbag (29).

9. A control device for small coal pillars in goaf excavation roadways under the influence of overlying residual coal pillars, as described in claim 1, characterized in that: The fixing components include concrete blocks (22) and retaining bars (31) uniformly poured on the inner walls of the four ends of the tunnel (2). The middle part of the concrete block (22) has a pre-reserved insertion groove (23). The concrete blocks (22) at the upper and lower ends of the tunnel (2) and the concrete blocks (22) at the left and right ends are not on the same horizontal line.

10. A control device for small coal pillars in goaf excavation roadways under the influence of overlying residual coal pillars, as described in claim 9, characterized in that: A plug-in block (28) is inserted into the plug-in slot (23). A base plate (24) is fixedly installed on the upper end of the plug-in block (28). A side plate (25) is fixedly installed on one side of the upper end of the base plate (24). A threaded rod (26) is threadedly connected to one end of the side plate (25). The threaded rod (26) passes through the side wall of the side plate (25) and a push block (27) is fixedly installed. A stop rod (31) is located between the base plate (24) and the side plate (25). The push block (27) pushes the stop rod (31) to contact the outer protective plate (30) and the stop rod (31) to contact each other.

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