Reinforcing device of fracture development coal pillar dam body and coal mine underground reservoir
By using a combination of grouting anchors, drag plates, elastic splints and pads in the coal pillar dam of the coal mine underground reservoir, the problems of crack development and breakage in the coal pillar dam caused by mine pressure and water pressure were solved, and the stability and safety of the coal pillar dam were improved.
Patent Information
- Application Number
- CN202510834318.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-09-19
AI Technical Summary
During the long-term operation, the coal pillar dam of the coal mine underground reservoir is affected by factors such as mine pressure and water pressure, resulting in the development of cracks and breakage, posing a safety hazard.
A combined structure of grouting anchor rods, drag plates, elastic splints and pads is adopted. The grouting anchor rods are driven into the coal pillar dam body and the exposed parts are covered with drag plates, elastic splints and pads. The rods are fixed with locking parts and combined with grouting reinforcement materials to achieve deformation constraint and crack control of the coal pillar dam body.
It improves the reliability and stability of the coal pillar dam, reduces safety hazards, ensures that the anchoring force of the grouting anchor rods is not reduced, prevents the continuous development of cracks inside the coal pillar dam, and improves the safety and reliability of the coal mine underground reservoir.
Smart Images
Figure CN120667167A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of coal mine technology, and in particular to a reinforcement device for a fractured coal pillar dam and a coal mine underground water reservoir. Background Art
[0002] As my country's coal production shifts to western China, the region is rich in coal resources but short on water. Utilizing coal mine goafs to construct underground coal mine reservoirs has become an effective way to address water shortages. However, the dam of an underground coal mine reservoir consists of a coal pillar formed around the goaf. This pillar is affected by various factors, including mine pressure and water pressure. Over long-term operation, cracks develop and the pillar dam breaks, posing a safety hazard to the reservoir. Summary of the Invention
[0003] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. This section of the application does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.
[0004] An embodiment of the first aspect of the present application provides a reinforcement device for a coal pillar dam with developed fractures, comprising: a grouting anchor rod, the head of the grouting anchor rod being inserted into the interior of the coal pillar dam body, and the tail of the grouting anchor rod being exposed to the outside of the coal pillar dam body; a drag plate, an elastic splint, and a pad, which are sleeved on the outside of the grouting anchor rod and arranged in sequence between the coal pillar dam body and the tail; a locking piece, which passes through the tail and is connected to the grouting anchor rod to fix the drag plate, the elastic splint, and the pad between the coal pillar dam body and the locking piece; wherein the elastic splint is configured to deform under force.
[0005] Exemplarily, the elastic splint includes: a fixing member, and two supporting plates arranged opposite to each other, the supporting plates including a supporting portion located in the middle, and connecting portions located on both sides of the supporting portion, the fixing member connects the connecting portions at relative positions of the two supporting plates, and the supporting portions of the two supporting plates are arranged opposite to each other and protrude away from each other. Exemplarily, the elastic splint further includes an elastic gasket, which is located between the connecting portions at relative positions of the two support plates, and the fixing member is passed through the elastic gasket.
[0006] Exemplarily, the supporting portion includes a first portion located in the middle and a second portion located on both sides of the first portion, the first portion and the connecting portion are arranged in parallel and configured to contact the tray or pad, and the second portion is arranged at an angle relative to the first portion and connects the first portion and the connecting portion.
[0007] Exemplarily, the initial distance between the first portions of the two support plates is 80 mm to 100 mm.
[0008] Exemplarily, a first avoidance hole for avoiding the grouting anchor rod is opened on the first part, the diameter of the first avoidance hole is larger than the rod diameter of the grouting anchor rod, and the difference between the diameter of the first avoidance hole and the rod diameter of the grouting anchor rod ranges from 1mm to 3mm.
[0009] Exemplarily, the tray is rectangular, the thickness of the tray is 8 mm to 12 mm, the side length of the tray is 200 mm to 300 mm, and the tray is provided with a second avoidance hole for avoiding the grouting anchor rod.
[0010] Exemplarily, the pad is rectangular, the thickness of the pad is 8 mm to 12 mm, the side length of the pad is 150 mm to 200 mm, and the pad is provided with a third avoidance hole for avoiding the grouting anchor rod.
[0011] Exemplarily, the rod portion of the grouting anchor is provided with an external thread structure, the coal pillar dam body is provided with a drill hole, and the gap between the outer ring of the external thread structure and the inner wall of the drill hole is 2 mm to 4 mm.
[0012] An embodiment of the second aspect of the present application provides a coal mine underground water reservoir, comprising: a coal pillar dam body, and a reinforcement device for the fracture-developed coal pillar dam body according to any one of the aforementioned items.
[0013] The embodiments of the present application provide a reinforcement device for a fractured coal pillar dam and an underground water reservoir. The reinforcement device includes a grouting anchor, a towing plate, an elastic splint, a pad, and a locking member. The grouting anchor is driven into the coal pillar dam so that the head of the grouting anchor is inserted into the interior of the coal pillar dam and the tail of the grouting anchor is exposed outside the coal pillar dam. The towing plate, the elastic splint, and the pad are sequentially inserted into the portion of the grouting anchor exposed outside the coal pillar dam. The locking member passes through the tail of the grouting anchor and connects to the grouting anchor. The towing plate, the elastic splint, and the pad are fixed between the coal pillar dam and the locking member, thereby restraining the deformation of the coal pillar dam. The grouting anchor is used to inject anti-seepage reinforcement material into the fractured and fractured rock mass inside the coal pillar dam to improve the reliability of the coal pillar dam. Since the elastic splint can be deformed under stress, the load will be transferred to the elastic splint through the drag plate during the deformation of the coal pillar dam with developed cracks. When the load reaches a certain value, the elastic splint will deform, thereby reducing or preventing the grouting anchor from sliding inside the coal pillar dam, ensuring that the bearing capacity of the grouting anchor is not reduced, and avoiding the problem of failure of the anchoring force of the grouting anchor due to deformation of the coal pillar dam. The grouting anchor has a reliable anchoring force, thereby preventing the continuous development of cracks inside the coal pillar dam, improving the reliability and stability of the coal pillar dam, reducing the safety hazards of the coal pillar dam, and improving the reliability and safety of the coal mine underground reservoir.
[0014] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the drawings, the same reference numerals are used to denote the same components. Figure 1 One of the structural schematic diagrams of the reinforcement device and the coal pillar dam provided in the embodiment of the present application is shown; Figure 2 One of the structural schematic diagrams of the elastic splint provided in the embodiment of the present application is shown; Figure 3 One of the structural schematic diagrams of the support plate provided in an embodiment of the present application is shown; Figure 4 A schematic diagram showing the detection results of abnormal seepage areas in the coal pillar dam body of the test section.
[0016] in, Figures 1 to 3 The corresponding relationship between the reference numerals and component names is as follows: 100 reinforcement device, 110 grouting anchor, 111 head, 112 tail, 113 grouting hole, 120 drag plate, 130 elastic splint, 131 fixing part, 1311 bolt, 1312 fixing nut, 132 support plate, 1321 supporting part, 1322 connecting part, 1323 first part, 1324 second part, 1325 first avoidance hole, 1326 connecting hole, 133 elastic gasket, 140 pad, 150 locking part, 200 coal pillar dam body, 210 drilling hole. DETAILED DESCRIPTION
[0017] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.
[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.
[0019] like Figures 1 to 3As shown, an embodiment of the first aspect of the present application provides a reinforcement device 100 for a fractured coal pillar dam body. An embodiment of the second aspect of the present application provides a coal mine underground reservoir, wherein the reinforcement device 100 is applied to a coal mine underground reservoir. Specifically, the reinforcement device 100 is used to reinforce a fractured coal pillar dam body 200 of the coal mine underground reservoir to improve the reliability and stability of the coal pillar dam body 200. It is understandable that the reinforcement device 100 provided in the embodiment of the present application can also be used to reinforce a water-retaining coal pillar dam body 200 that has been severely damaged by mining tremors, earthquakes, or long-term bearing creep, or is soft and broken, and belongs to the technical field of coal mine underground reservoir dam body construction.
[0020] like Figure 1 As shown, an embodiment of the first aspect of the present application provides a reinforcement device 100 for a coal pillar dam with developed fractures, comprising: a grouting anchor 110, wherein the head 111 of the grouting anchor 110 is inserted into the interior of the coal pillar dam 200, and the tail 112 of the grouting anchor 110 is exposed to the outside of the coal pillar dam 200; a drag plate 120, an elastic splint 130, and a pad 140, which are sleeved on the outside of the grouting anchor 110 and arranged in sequence between the coal pillar dam 200 and the tail 112; a locking member 150, wherein the locking member 150 passes through the tail 112 and is connected to the grouting anchor 110 to fix the drag plate 120, the elastic splint 130, and the pad 140 between the coal pillar dam 200 and the locking member 150; wherein the elastic splint 130 is configured to deform under force.
[0021] The reinforcement device 100 for a fractured coal pillar dam provided in an embodiment of the present application comprises a grouting anchor rod 110, a drag plate 120, an elastic splint 130, a pad 140, and a locking member 150. The grouting anchor rod 110 is driven into the coal pillar dam 200 so that the head 111 of the grouting anchor rod 110 is inserted into the interior of the coal pillar dam 200 and the tail 112 of the grouting anchor rod 110 is exposed to the outside of the coal pillar dam 200. The tray 120, the elastic splint 130 and the pad 140 are sequentially inserted so that the tray 120 is close to the surface of the coal pillar dam 200, and the elastic splint 130 is located between the tray 120 and the pad 140. Then the locking piece 150 passes through the tail 112 of the grouting anchor 110 and is connected to the grouting anchor 110, and the tray 120, the elastic splint 130 and the pad 140 are fixed between the coal pillar dam 200 and the locking piece 150, thereby constraining the deformation of the coal pillar dam 200. For example, the grouting anchor 110 is driven into the coal pillar dam 200 along the transverse direction of the coal pillar dam 200, where the transverse direction can be understood as being parallel or approximately parallel to the coal seam bottom plate. The drag plate 120, the elastic splint 130 and the pad 140 are arranged in sequence along the transverse direction of the coal pillar dam 200. Thus, after the locking member 150 fixes the drag plate 120, the elastic splint 130 and the pad 140 between the coal pillar dam 200 and the locking member 150, the lateral deformation of the coal pillar dam 200 can be constrained to improve the reliability and stability of the coal pillar dam 200.
[0022] Furthermore, by injecting anti-seepage reinforcement material into the fractured and fractured rock mass inside the coal pillar dam 200 through the grouting anchor rods 110, the reliability and stability of the coal pillar dam 200 can be improved. At the same time, because the elastic splint 130 is deformable under load, the load of the fractured coal pillar dam 200 is transferred to the elastic splint 130 via the drag plate 120 during deformation. When the load reaches a certain value, the elastic splint 130 will deform, thereby reducing or preventing the grouting anchor rods 110 from sliding inside the coal pillar dam 200, ensuring that the bearing capacity of the grouting anchor rods 110 is not reduced, and avoiding the problem of the anchoring force of the grouting anchor rods 110 failing due to deformation of the coal pillar dam 200. This ensures that the grouting anchor rods 110 have reliable anchoring force, thereby preventing the continued development of fractures inside the coal pillar dam 200, improving the reliability and stability of the coal pillar dam 200, reducing safety hazards of the coal pillar dam 200, and improving the reliability and safety of the coal mine underground water reservoir.
[0023] That is to say, the reinforcement device 100 provided in the embodiment of the present application performs uniform load-bearing constraint and grouting reinforcement on the coal pillar dam body 200 with developed fractures during the deformation process, and at the same time can avoid the problem of failure of the anchoring force of the grouting anchor rod 110 due to the deformation of the coal pillar dam body 200, which is conducive to ensuring the safety and stability of the coal pillar dam body 200.
[0024] The head 111 of the grouting anchor 110 is provided with a grouting hole 113, through which anti-seepage reinforcement material can be introduced into the fractured and fissured rock mass within the coal pillar dam 200, thereby improving the reliability and stability of the coal pillar dam 200. Specifically, the number of grouting holes 113 can be one, two, three, or more, and this application does not impose any specific restrictions on this. Specifically, after the grouting anchor 110 and the coal pillar dam 200 are installed, the grouting holes 113 can be used to provide anti-seepage reinforcement for the fissures developed in the coal pillar dam 200.
[0025] The locking member 150 may be a locking nut, a clamp, or other locking structure. Specifically, the locking member 150 is a locking nut. The rod portion of the grouting anchor rod 110 is provided with an external thread structure. The locking nut cooperates with the external thread structure to facilitate the assembly and disassembly of the locking nut and the grouting anchor rod 110 and to facilitate adjustment of the position of the locking nut on the grouting anchor rod 110, thereby fixing the tray 120, the elastic clamping plate 130, and the backing plate 140 between the coal pillar dam body 200 and the locking member 150.
[0026] The elastic splint 130 is configured to deform under load, that is, the elastic splint 130 has a certain deformation amount and can deform under the action of an external force. It is understood that after the external force disappears, the elastic splint 130 can recover its deformation. It is understood that when the tray 120, the elastic splint 130, and the backing plate 140 are fixed between the coal pillar dam 200 and the locking member 150 by the locking nut, the elastic splint 130 has an initial deformation amount. In this way, during the deformation of the coal pillar dam 200 with developed cracks, the load will be transferred to the elastic splint 130, causing the elastic splint 130 to deform, thereby avoiding the problem of the anchoring force of the grouting anchor 110 failing due to the deformation of the coal pillar dam 200. The grouting anchor 110 has a reliable anchoring force to prevent the continuous development of cracks inside the coal pillar dam 200, improve the reliability and stability of the coal pillar dam 200, and reduce the safety hazards of the coal pillar dam 200.
[0027] like Figure 2As shown, in some possible embodiments provided in the present application, the elastic splint 130 includes: a fixing member 131, and two support plates 132 arranged opposite to each other, the support plates 132 include a support portion 1321 located in the middle, and connecting portions 1322 located on both sides of the support portion 1321, the fixing member 131 connects the connecting portions 1322 at relative positions of the two support plates 132, and the support portions 1321 of the two support plates 132 are arranged opposite to each other and protrude in a direction away from each other. As a result, the two support parts 1321 are enclosed to form a space, providing a basis for the deformation of the elastic splint 130. In this way, the elastic splint 130 can make the two support parts 1321 approach each other and deform under the action of external force. For example, after the coal pillar dam body 200 with developed cracks is deformed, the two support parts 1321 of the elastic splint 130 can be brought close to each other and deformed to adapt to the deformation of the coal pillar dam body 200. This setting can reduce the displacement of the grouting anchor rod 110 inside the coal pillar dam body 200, and can avoid the problem of failure of the anchoring force of the grouting anchor rod 110 due to deformation of the coal pillar dam body 200, so that the grouting anchor rod 110 has a reliable anchoring force to prevent the continuous development of cracks inside the coal pillar dam body 200, thereby improving the reliability and stability of the coal pillar dam body 200.
[0028] Among them, the two sides of the support part 1321 are connecting parts 1322, and the connecting parts 1322 at the relative positions of the two support plates 132 are connected by fixing parts 131, such as the connecting parts 1322 at the first ends of the two support plates 132 are connected by fixing parts 131, and the connecting parts 1322 at the second ends of the two support plates 132 are connected by fixing parts 131, thereby realizing the assembly of the elastic splint 130. This setting makes the structure of the elastic splint 130 simple, easy to implement, and low in cost. At the same time, the two support plates 132 have the same structure, can be mass-produced, convenient for replacement and maintenance, and conducive to further saving the manufacturing cost of the elastic splint 130.
[0029] Furthermore, the fixing member 131 includes a bolt 1311 and a fixing nut 1312. The bolt 1311 is passed through the connecting portion 1322 on the same side of the two support plates 132. The fixing nut 1312 is connected to the bolt 1311 to clamp the connecting portion 1322 on the same side of the two support plates 132. Thus, the fixing nut 1312 is connected to the bolt 1311 to clamp the connecting portions 1322 on both sides of the two support plates 132, so as to achieve a reliable connection between the two support plates 132, facilitate disassembly and assembly, and help improve the assembly efficiency of the elastic splint 130.
[0030] Specifically, if Figure 3As shown, the connecting portion 1322 is provided with a connecting hole 1326 for the fixing member 131 to pass through, such as the connecting hole 1326 for the bolt 1311 to pass through. The connecting portions 1322 on the same side of the two support plates 132 can be connected by one or more fixing members 131, that is, the number of the connecting holes 1326 on the connecting portion 1322 can be one, two, three, or other numbers. Specifically, as Figure 3 As shown, there are two connecting holes 1326 on the connecting portion 1322 , that is, the connecting portions 1322 on the same side of the two support plates 132 are connected through two fixing members 131 .
[0031] The support plate 132 is an integrated structure, which is beneficial to improving the strength and reliability of the support plate 132 , thereby improving the reliability of the elastic clamping plate 130 and improving the overall reliability of the reinforcement device 100 .
[0032] The support plate 132 is made of high-strength stainless steel. High-strength stainless steel is corrosion-resistant, can withstand a certain degree of deformation, and can resist impact loads. This improves the reliability of the elastic clamp 130 and provides the elastic clamp 130 with a certain degree of deformation capacity, ensuring the long-term use of the reinforcement device 100 without failure, thereby extending the service life of the reinforcement device 100. Specifically, the high-strength stainless steel may be martensitic precipitation-hardening stainless steel, austenitic cold-work-hardening stainless steel, duplex stainless steel, or the like.
[0033] like Figure 2 As shown, in some possible embodiments provided by the present application, the elastic clamping plate 130 further includes an elastic gasket 133. The elastic gasket 133 is located between the connecting portions 1322 at opposing positions of the two support plates 132, and the fixing member 131 is passed through the elastic gasket 133. The provision of the elastic gasket 133 can prevent the connecting portions 1322 of the two support plates 132 from loosening, thereby improving the reliability and stability of the connection between the two support plates 132.
[0034] Specifically, the elastic gasket 133 is a rubber gasket, and the rubber gasket is located between the contact surfaces of the connecting portions 1322 on the same side of the two support plates 132 .
[0035] Specifically, the fixing member 131 includes a bolt 1311 and a fixing nut 1312. An elastic gasket 133 may also be provided at the contact position between the fixing nut 1312 and the connecting portion 1322 of the support plate 132 to prevent loosening between the fixing nut 1312 and the support plate 132, thereby improving the reliability and stability of the connection between the fixing nut 1312 and the support plate 132.
[0036] Specifically, if Figure 2As shown, the elastic clamping plate 130 is composed of two supporting plates 132, fixing parts 131, and elastic gaskets 133. The two supporting plates 132 are arranged oppositely, and the supporting plates 132 protrude in the opposite direction to form a supporting portion 1321. The two sides of the supporting portion 1321 of the supporting plate 132 are connecting parts 1322. A rubber gasket is provided between the contact surfaces of the two connecting parts 1322 at the same end of the two supporting plates 132. The fixing part 131 includes a bolt 1311 and a fixing nut 1312. The bolt 1311 passes through the supporting portion 1321 at the same end of the two supporting plates 132, and a rubber gasket is provided between the fixing nut 1312 and the contact surface of the connecting part 1322. The fixing nut 1312 is connected to the bolt 1311 to clamp and fix the two connecting parts 1322 at the same end of the two supporting plates 132. Thus, the connecting parts 1322 at both ends of the two supporting plates 132 can be clamped and fixed respectively to reliably connect the two support plates 132. The rubber gasket can prevent the two support plates 132 and the fixing nut 1312 from loosening, thereby improving the reliability and stability of the elastic clamping plate 130 .
[0037] like Figure 2 and Figure 3 As shown, in some possible embodiments provided by the present application, the support portion 1321 includes a first portion 1323 located in the middle and second portions 1324 located on both sides of the first portion 1323. The first portion 1323 and the connecting portion 1322 are arranged in parallel and configured to contact the tray 120 or the pad 140. The second portion 1324 is arranged obliquely relative to the first portion 1323 and connects the first portion 1323 and the connecting portion 1322. As a result, the first portion 1323 and the two second portions 1324 together form the support portion 1321, and the support portion 1321 protrudes outward relative to the connecting portion 1322. In this way, the connection of the two support plates 132 by the connecting portion 1322 can make the space enclosed between the support portions 1321 of the two support plates 132 larger, providing sufficient deformation for the elastic clamping plate 130, so that the elastic clamping plate 130 has good deformation ability.
[0038] Among them, the first part 1323 is arranged parallel to the connecting part 1322, and the first part 1323 is configured to contact the tray 120 or the pad 140. Since the connecting parts 1322 of the two support plates 132 are in contact and connected, and the first part 1323 of the same support plate 132 is arranged parallel to the connecting part 1322, the first parts 1323 of the two support plates 132 can be arranged parallel, which is beneficial to improve the uniformity of the force applied to the elastic clamp 130 and improve the reliability of the elastic clamp 130.
[0039] Specifically, the first portion 1323 of the support plate 132 of the elastic splint 130 near the tray 120 contacts the tray 120, and the first portion 1323 of the support plate 132 near the pad 140 contacts the pad 140. This improves the uniformity and stability of the force applied to the elastic splint 130. Thus, when the coal pillar dam 200 deforms, the elastic splint 130 begins to bear the load. Because the space formed between the two support portions 1321 of the elastic splint 130 reserves a certain amount of free deformation, the deformation of the elastic splint 130 ensures that the grouting anchor 110 does not slip within the borehole 210 in the coal pillar dam 200, ensuring that the anchoring force is not reduced, providing reliable support for the coal pillar dam 200, and improving the reliability and stability of the coal pillar dam 200.
[0040] like Figure 2 As shown, in some possible embodiments provided in the present application, the initial distance between the first portions 1323 of the two support plates 132 is 80 mm to 100 mm.
[0041] The initial distance can be understood as the distance between the two first parts 1323 when the two support plates 132 are connected by the fixing member 131 and are not subjected to external force. Figure 2 By properly setting the range of the initial distance H between the first portions 1323 of the two support plates 132, it is possible to ensure that the elastic clamping plate 130 has sufficient deformation. After the coal pillar dam 200 with developed cracks deforms and the force on the first portion 1323 reaches a certain level, the distance between the first portions 1323 of the two support plates 132 begins to decrease, thereby ensuring that the grouting anchor rod 110 does not slip within the borehole 210 of the coal pillar dam 200 and that the anchoring force is not reduced. This prevents the continuous development of cracks within the coal pillar dam 200, provides reliable support for the coal pillar dam 200, and improves the reliability and stability of the coal pillar dam 200.
[0042] Specifically, the initial distance H between the first portions 1323 of the two support plates 132 may be 80 mm, 90 mm, 100 mm, or other sizes.
[0043] like Figure 3 As shown, in some possible embodiments provided in the present application, a first avoidance hole 1325 is provided on the first portion 1323 for avoiding the grouting anchor rod 110. The provision of the first avoidance hole 1325 enables the grouting anchor rod 110 to smoothly pass through the elastic clamping plate 130. Specifically, the first avoidance hole 1325 can be located at the center of the first portion 1323 and can be a circular hole. The diameter of the first avoidance hole 1325 is larger than the rod diameter of the grouting anchor 110. The difference between the diameter of the first avoidance hole 1325 and the rod diameter of the grouting anchor 110 ranges from 1 mm to 3 mm. This facilitates the smooth passage of the grouting anchor 110 through the elastic splint 130, thereby improving the assembly efficiency of the reinforcement device 100 and the coal pillar dam body 200. Specifically, the difference between the diameter of the first avoidance hole 1325 and the rod diameter of the grouting anchor 110 can be 1 mm, 2 mm, 3 mm, or other sizes. Taking the rod diameter of the grouting anchor 110 as an example of 24 mm, the diameter of the first avoidance hole 1325 can be 25 mm, 26 mm, 27 mm, or other sizes. Specifically, the diameter of the first avoidance hole 1325 can be 26 mm.
[0044] In some possible embodiments provided in this application, the rod portion of the grouting anchor 110 is provided with an external thread structure, the coal pillar dam body 200 is provided with a borehole 210, and the gap between the outer ring of the external thread structure and the inner wall of the borehole 210 is 2mm to 4mm.
[0045] The grouting anchor rod 110 is inserted into the coal pillar dam body 200 through the borehole 210. The provision of the external thread structure increases the bonding area between the rod portion of the grouting anchor rod 110 and the grouting material, thereby improving the anchoring force.
[0046] Among them, by reasonably setting the gap between the outer ring of the external thread structure and the inner wall of the borehole 210, the grouting anchor rod 110 can be smoothly inserted into the interior of the coal pillar dam body 200, thereby improving the assembly efficiency of the grouting anchor rod 110 and the coal pillar dam body 200. At the same time, it provides a holding space for the grouting material, so that the grouting material can smoothly fill the gap between the outer ring of the external thread structure and the inner wall of the borehole 210 to improve the anchoring force.
[0047] Specifically, the gap between the outer ring of the external thread structure of the grouting anchor rod 110 and the inner wall of the borehole 210 can be 2 mm, 3 mm, 4 mm, or other sizes. Specifically, taking the diameter of the grouting anchor rod 110 as 24 mm and the rod length of the grouting anchor rod 110 as 3500 mm as an example, during installation, it can be ensured that the gap between the inner wall of the borehole 210 of the coal pillar dam body 200 and the outer ring of the external thread structure of the grouting anchor rod 110 is approximately 3 mm.
[0048] In some possible embodiments provided herein, the tray 120 is rectangular, has a thickness of 8 mm to 12 mm, and has a side length of 200 mm to 300 mm. By properly setting the thickness and size of the tray 120, the tray 120 can evenly transfer the load during the deformation of the fractured coal pillar dam 200 to the elastic splint 130, thereby improving the uniformity of the force applied to the elastic splint 130, thereby reducing the displacement of the grouting anchor 110 within the borehole 210, ensuring that the anchoring force is not reduced, providing reliable support for the coal pillar dam 200, and improving the reliability and stability of the coal pillar dam 200.
[0049] Among them, the thickness direction of the tray 120 is parallel to the length direction of the anchor rod, such as the thickness direction of the tray 120 can be parallel to the horizontal direction of the coal pillar dam 200, and the thickness of the tray 120 can be 8mm, 9mm, 10mm, 11mm, 12mm, or other sizes.
[0050] The side length of the tray 120 can be 200 mm, 250 mm, 300 mm, or other sizes. Specifically, the tray 120 can be square or rectangular. When the tray 120 is rectangular, the lengths of the two sets of opposite sides of the tray 120 can be 200 mm and 300 mm, or other sizes, respectively.
[0051] Furthermore, the tray 120 is provided with a second avoidance hole for avoiding the grouting anchor rod 110. The provision of the second avoidance hole enables the grouting anchor rod 110 to pass through the tray 120 smoothly. The diameter of the second avoidance hole is larger than the rod diameter of the grouting anchor rod 110 to ensure that the grouting anchor rod 110 can pass through the tray smoothly. Specifically, the difference between the diameter of the second avoidance hole and the rod diameter of the grouting anchor rod 110 can be 1mm, 2mm, 3mm, or other sizes. Taking the rod diameter of the grouting anchor rod 110 as 24mm as an example, the diameter of the second avoidance hole can be 25mm, or other sizes.
[0052] In some possible embodiments provided in the present application, the pad 140 is rectangular, the thickness of the pad 140 is 8 mm to 12 mm, and the side length of the pad 140 is in the range of 150 mm to 200 mm.
[0053] The setting of the pad 140 is used to ensure that the grouting anchor rod 110 is subjected to pre-tightening force. By reasonably setting the thickness and size of the pad, the pad can evenly transfer the load during the deformation of the fractured coal pillar dam body 200 to the elastic splint 130, that is, the pad 140 can ensure that the uniform load acts on the first part 1323 of the elastic splint 130, thereby improving the uniformity of the force on the elastic splint 130, so as to reduce the displacement of the grouting anchor rod 110 in the borehole 210, ensure that the anchoring force is not reduced, provide reliable support for the coal pillar dam body 200, and improve the reliability and stability of the coal pillar dam body 200.
[0054] Among them, the thickness direction of the pad 140 is parallel to the length direction of the anchor rod, such as the thickness direction of the pad 140 can be parallel to the horizontal direction of the coal pillar dam 200, and the thickness of the pad 140 can be 8mm, 9mm, 10mm, 11mm, 12mm, or other sizes.
[0055] The side length of the pad 140 can be 150mm, 180mm, 200mm, or other sizes. Specifically, the pad 140 can be square or rectangular. When the pad 140 is rectangular, the two sets of contrasting lengths of the pad 140 can be 150mm and 200mm, or other sizes, respectively.
[0056] Furthermore, the backing plate 140 is provided with a third avoidance hole for avoiding the grouting anchor rod 110. The provision of the third avoidance hole enables the grouting anchor rod 110 to pass through the backing plate 140 smoothly. The diameter of the third avoidance hole is larger than the rod diameter of the grouting anchor rod 110 to ensure that the grouting anchor rod 110 can pass through the backing plate 140 smoothly. Specifically, the third avoidance hole is a circular hole, and the difference between the diameter of the third avoidance hole and the rod diameter of the grouting anchor rod 110 can be 1mm, 2mm, 3mm, or other sizes. Taking the rod diameter of the grouting anchor rod 110 as 24mm as an example, the diameter of the third avoidance hole can be 25mm, or other sizes.
[0057] Specifically, the pad 140 and the tray 120 have the same thickness, so that they can be made from the same piece of plate, which helps to save manufacturing costs.
[0058] An embodiment of the second aspect of the present application provides a coal mine underground reservoir, comprising: a coal pillar dam 200, and the reinforcement device 100 for a fractured coal pillar dam according to any of the aforementioned embodiments. Because the coal mine underground reservoir includes the reinforcement device 100 for a fractured coal pillar dam according to any of the aforementioned embodiments, it possesses all the technical effects of the aforementioned reinforcement device 100 for a fractured coal pillar dam, and thus will not be further detailed here.
[0059] Furthermore, a coal pillar dam 200 is formed around the goaf after coal mining. The coal pillar dam 200, the coal seam roof, and the coal seam floor together form a water storage area to serve as the water storage space of the coal mine underground reservoir.
[0060] Among them, one, two, or more reinforcement devices 100 can be installed on the coal pillar dam 200 on the same side to ensure the reliability and stability of the coal pillar dam 200. Specifically, based on the seepage conditions of the coal pillar dam 200, the reinforcement device 100 can be used to reinforce the coal pillar dam 200 where fractures are developed in areas of the coal pillar dam 200 where the seepage is abnormally severe, thereby improving the reliability of the coal pillar dam 200, reducing safety hazards of the coal pillar dam 200, and improving the reliability of the coal mine underground water reservoir.
[0061] Specifically, Figure 4 The figure shows the detection results of the abnormal seepage area of the coal pillar dam 200 in the test section. Specifically, the coal pillar dam 200 in the test section can be the abnormal seepage area of the coal pillar dam 200 in the water storage goaf of the coal mine underground reservoir. Figure 4 The following is a schematic diagram of the detection results of the abnormal seepage area of the coal pillar dam 200 in the test section obtained by high-density electrical method. Figure 4 The resistivity in the medium gradually increases from blue-green to yellow-brown, i.e. Figure 4 The blue-green color in can represent low resistance areas, such as Figure 4 As shown in area A and area B in the figure, the yellow-brown area represents the high resistance area. Figure 4 As shown in Area C and Area D in the figure. Among them, the low-resistance area is characterized by low resistivity, which usually corresponds to water-rich, crack-developed or broken coal areas. This area has good conductivity, which may be related to the enhanced mineral conductivity caused by groundwater infiltration, pore water filling or oxidation. The high-resistance area has a high resistivity, reflecting that the coal structure is relatively complete, dry or contains low-conductivity materials (such as dense coal rock). It has poor conductivity and is commonly found in coal pillars that have not been significantly damaged or in areas with good sealing. Therefore, according to Figure 4 The schematic diagram of the detection results of the abnormal seepage area of the coal pillar dam 200 in the test section shown in FIG. 1 shows that the reinforcement device 100 can be set in the low resistance area, such as Figure 4 Reinforcement devices 100 are provided in the areas A and B shown to prevent continuous development of cracks inside the coal pillar dam 200 and improve the stability and reliability of the coal pillar dam 200 .
[0062] Specifically, the specific process of constructing the reinforcement device 100 on the coal pillar dam body 200 is as follows: First, install the grouting anchor 110 on the coal pillar dam 200. Specifically, anchor the grouting anchor 110 to the designed depth of the drill hole 210 on the coal pillar dam 200, leaving enough exposed length. During construction and installation, ensure that the gap between the inner wall of the drill hole 210 and the outer ring of the external thread structure on the outside of the grouting anchor 110 is about 3mm.
[0063] Next, the tray 120 is installed. Specifically, the tray 120 is sleeved on the outside of the grouting anchor 110 by the tail 112 of the grouting anchor 110, and is installed close to the surface of the coal pillar dam 200.
[0064] Then, assemble and install the elastic clamping plate 130. Specifically, two support plates 132 provided with support portions 1321 with reverse protrusions are assembled into the elastic clamping plate 130 through the fixing member 131 and the elastic gasket 133. The elastic clamping plate 130 is sleeved on the outside of the grouting anchor rod 110 by the tail portion 112 of the grouting anchor rod 110 and is closely attached to the towing plate 120.
[0065] Then, the backing plate 140 is installed. Specifically, the backing plate 140 is sleeved on the outside of the grouting anchor 110 by the tail portion 112 of the grouting anchor 110 and is in close contact with the elastic clamping plate 130. That is, the backing plate 140 is in close contact with the side of the elastic clamping plate 130 away from the coal pillar dam 200, and the drag tray 120 is in close contact with the side of the elastic clamping plate 130 close to the coal pillar dam 200.
[0066] Then, install the locking member 150. Specifically, the locking member 150 is a locking nut that cooperates with the external thread structure on the outside of the grouting anchor 110. Tighten the locking nut to complete the installation of the reinforcement device 100, and control the deformation of the coal pillar dam body 200 through the elastic deformation of the elastic splint 130.
[0067] Finally, according to the grouting reinforcement operation process, grouting material is injected into the coal pillar dam body 200 through the grouting hole 113 of the head 111 of the grouting anchor 110 to fill the cracks developed in the coal pillar dam body 200 and play a role in anti-seepage reinforcement.
[0068] The reinforcement device 100 for a coal pillar dam with developed fissures provided in this application has a simple structure and realizes the control of fissure development in the coal pillar dam 200 under long-term operation in a coal mine underground reservoir. Specifically, as the coal pillar dam 200 deforms, the tray 120 of the reinforcement device 100 begins to bear force and transfers the load to the elastic splint 130. The elastic splint 130 deforms, reducing the distance between the two first parts 1323. This ensures that the bearing capacity of the grouting anchor 110 is not reduced, thereby preventing the continuous development of fissures within the coal pillar dam 200 and improving the stability and reliability of the coal pillar dam 200. Among them, the elastic splint 130 has the advantages of high strength, high elasticity, deformation resistance, and corrosion resistance, which can ensure the long-term use of the reinforcement device 100 without failure. In addition, the grouting anchor 110 with a grouting hole 113 on the head 111 can facilitate grouting reinforcement of the developed fissures in the coal pillar dam 200, thereby effectively ensuring the stability of the coal pillar dam 200.
[0069] The reinforcement device 100 for the coal pillar dam with developed fissures provided in the present application has the advantages of simple structure, easy processing and installation, corrosion resistance, stable mechanical properties, and low cost. It provides an effective method for controlling the development of fissures in the coal pillar dam 200 of the coal mine underground reservoir and reinforcing the coal pillar dam 200, and is suitable for promotion and application.
[0070] In the description of this application, the term "plurality" refers to two or more, unless otherwise expressly defined. The orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship described in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application; the terms "connect", "install", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0071] In the description of the present application, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A reinforcement device for a coal pillar dam with developed fissures, characterized in that: include: a grouting anchor rod, wherein the head of the grouting anchor rod is inserted into the interior of the coal pillar dam body, and the tail of the grouting anchor rod is exposed outside the coal pillar dam body; The drag plate, the elastic clamping plate and the pad are sleeved on the outside of the grouting anchor and arranged in sequence between the coal pillar dam body and the tail; a locking member, the locking member passing through the tail portion and connected to the grouting anchor rod to fix the drag plate, the elastic clamping plate, and the backing plate between the coal pillar dam body and the locking member; Wherein, the elastic splint is configured to deform when subjected to force.
2. The reinforcement device for a fractured coal pillar dam according to claim 1, characterized in that: The elastic splint comprises: A fixing member and two supporting plates arranged opposite to each other, wherein the supporting plates include a supporting portion located in the middle and connecting portions located on both sides of the supporting portion, the fixing member connects the connecting portions at relative positions of the two supporting plates, and the supporting portions of the two supporting plates are arranged opposite to each other and protrude in a direction away from each other.
3. The reinforcement device for a fractured coal pillar dam according to claim 2, characterized in that: The elastic clamping plate further includes an elastic gasket, which is located between the connecting portions at relative positions of the two support plates, and the fixing member is passed through the elastic gasket.
4. The reinforcement device for a fractured coal pillar dam according to claim 2, characterized in that: The supporting portion includes a first portion located in the middle and second portions located on both sides of the first portion. The first portion and the connecting portion are arranged in parallel and are configured to contact the tray or the pad. The second portion is arranged obliquely relative to the first portion and connects the first portion and the connecting portion.
5. The reinforcement device for a fractured coal pillar dam according to claim 4, characterized in that: An initial distance between the first portions of the two support plates is 80 mm to 100 mm.
6. The reinforcement device for a fractured coal pillar dam according to claim 4, characterized in that: The first portion is provided with a first avoidance hole for avoiding the grouting anchor rod. The diameter of the first avoidance hole is larger than the rod diameter of the grouting anchor rod, and the difference between the diameter of the first avoidance hole and the rod diameter of the grouting anchor rod ranges from 1 mm to 3 mm.
7. The reinforcement device for a fractured coal pillar dam according to any one of claims 1 to 6, characterized in that: The tray is rectangular, has a thickness of 8 mm to 12 mm, and a side length of 200 mm to 300 mm. The tray is provided with a second avoidance hole for avoiding the grouting anchor rod.
8. The reinforcement device for a fractured coal pillar dam according to any one of claims 1 to 6, characterized in that: The pad is rectangular, has a thickness of 8 mm to 12 mm, and a side length of 150 mm to 200 mm. The pad is provided with a third avoidance hole for avoiding the grouting anchor rod.
9. The reinforcement device for a fractured coal pillar dam according to any one of claims 1 to 6, characterized in that: The rod portion of the grouting anchor is provided with an external thread structure, the coal pillar dam body is provided with a drill hole, and the gap between the outer ring of the external thread structure and the inner wall of the drill hole is 2mm to 4mm.
10. A coal mine underground reservoir, characterized in that: include: A coal pillar dam, and a reinforcement device for a coal pillar dam with developed fractures according to any one of claims 1 to 9.