Mine fixed-point sealing and filling integrated device

Abstract

The utility model provides a fixed point sealing and grouting integrated device for coal mine drilling hole sealing and grouting, including grouting sealing mechanism, pressure control mechanism and guide assembly, grouting sealing mechanism includes grouting pipe and the sealing bag of wrapping setting in the outer periphery of grouting pipe, pressure control mechanism includes a setting in the pressure control valve of grouting pipe front end end, guide assembly includes the guide sleeve of setting in the grouting pipe front and rear end, the outer diameter of guide sleeve is greater than the outer diameter of grouting pipe, and with the bore diameter of the required sealing drilling hole is adapted, the pressure control valve is provided with high pressure grout outlet, to reach the critical value of pressure control valve in grouting pipe and sealing bag in grouting pressure, high pressure grout outlet opens, and grouting slurry is discharged by high pressure grout outlet. The utility model can effectively deal with the problem that the drill rod cannot advance and cannot complete gas extraction after encountering soft coal seam, fissure widespread rock mass structure zone or interstice in the process of drilling.

Description

Technical Field

[0001] This utility model relates to the field of coal mine equipment technology, specifically to a fixed-point sealing and injection integrated device for mines. Background Technology

[0002] Coal mine gas control is of paramount importance in coal mine construction operations. Gas drainage operations require drilling into pre-defined coal seam work points to a predetermined depth, completing targeted coal seam sampling and gas drainage within the predetermined depth area to provide sufficient safety for subsequent underground construction operations. Currently, a problem exists in coal seam drilling: during drilling, if encountering soft coal seams, fractured rock formations, or voids, the drill rod and drill bit at the front end deviate from the drilling axis due to reduced drilling pressure caused by the high-speed rotation of the drilling rig, resulting in varying degrees of "swinging" and preventing the drill rod from advancing further. On the one hand, the drill pipe cannot be driven to the preset depth, making it impossible to continue gas extraction in the preset area of ​​the coal seam, thus making the extraction operation in that borehole completely impossible; on the other hand, when facing the rock mass structure zone, even if it has approached or reached the preset depth, the dense fractures will cause the preset area to be interconnected with the surrounding fracture extension areas, which will seriously affect the gas extraction effect of the preset area and fail to meet the extraction requirements.

[0003] Currently, the only effective solution to the above situation is to abandon the drilling at that location and find a new location to drill and continue the extraction operation. However, this approach will also result in a significant loss of manpower, material resources, and financial resources, and will severely delay the construction period and reduce production efficiency. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to propose an integrated fixed-point sealing device for mining, which can effectively cope with the occurrence of the above situations, effectively avoid the loss of manpower, material resources and financial resources, and improve production efficiency.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: A mining-grade fixed-point sealing and grouting integrated device is used for sealing and grouting boreholes in coal mines. It includes a grouting and sealing mechanism, a pressure control mechanism, and a guiding assembly. The grouting and sealing mechanism includes a grouting pipe and a sealing bag surrounding the grouting pipe. The pressure control mechanism includes a pressure control valve located at the front end of the grouting pipe. The guiding assembly includes guide sleeves located at the front and rear ends of the grouting pipe. The outer diameter of the guide sleeves is larger than the outer diameter of the grouting pipe and is adapted to the borehole diameter to be sealed. The pressure control valve is equipped with a high-pressure grout outlet. When the grouting pressure in the grouting pipe and the sealing bag reaches the critical value of the pressure control valve, the high-pressure grout outlet opens, allowing the grout to be discharged.

[0006] As a preferred embodiment of the above technical solution, the sealing bag is fitted onto the grouting pipe, and both ends of the sealing bag are sealed and fastened by a clamp. The grouting pipe has a grout inlet on the pipe body located inside the sealing bag.

[0007] As a preferred embodiment of the above technical solution, the tail end of the grouting pipe is provided with a connector for connecting the drill rod.

[0008] As a preferred embodiment of the above technical solution, one end of the connector is provided with a male head for connecting to the grouting pipe, and the other end is provided with a female head for connecting to the drill rod, and the central hole of the connector is in communication with the grouting pipe.

[0009] As a preferred embodiment of the above technical solution, the guide sleeve includes a circular sleeve and a plurality of wing plates evenly distributed around the circumference of the circular sleeve. The wing plates are arranged radially along the circular sleeve, and the length of the wing plates is adapted to the circular sleeve.

[0010] As a preferred embodiment of the above technical solution, at least three wing plates are evenly distributed around the circumference of the circular sleeve.

[0011] As a preferred embodiment of the above technical solution, the outer wrapping of the sealed bag is provided with a protective strip.

[0012] As a preferred embodiment of the above technical solution, the pressure control valve includes a valve body, a sealing head disposed at the front end of the valve body, a compression spring disposed in the inner cavity of the valve body, and a piston head disposed at the rear end of the valve body. The high-pressure grout outlet is disposed on the circumferential side wall of the valve body corresponding to the piston head, so that when the grouting pressure is less than the deformation pressure of the compression spring, the piston head seals the high-pressure grout outlet, and when the grouting pressure is greater than the deformation pressure of the compression spring, the piston head is displaced as the compression spring is compressed, thereby disengaging from the seal on the high-pressure grout outlet.

[0013] As a preferred embodiment of the above technical solution, the valve body is provided with a connecting shaft at its tail end for connecting the grouting pipe. One end of the connecting shaft is threaded to the end of the grouting pipe, and the other end is threaded to the end of the valve body. The connecting shaft has a central hole that communicates with the grouting pipe.

[0014] As a preferred embodiment of the above technical solution, the valve body is circumferentially fitted with a reversing sleeve, the inner diameter of which is larger than the outer diameter of the valve body, so as to form a slurry outlet channel between the inner wall of the reversing sleeve and the outer circumferential wall of the valve body, which is connected to the high-pressure slurry outlet. The slurry outlet channel is sealed at the tail end and open at the front end, so that the slurry flowing vertically out of the high-pressure slurry outlet is sprayed toward the front of the valve body.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This application effectively addresses the problem of drill rods being unable to advance and gas extraction being impossible when encountering soft coal seams, rock mass structures riddled with fissures, or voids (hereinafter referred to as "fissures") during drilling. The main reason is that: The sealing device described in this application can perform grouting and sealing operations in the borehole when the drill rod encounters a "crack" and cannot advance. The blocked part of the borehole is sealed by grouting, thereby sealing the borehole on one side of the "crack" and returning the "crack" to a sealed space. Then, the device described in this application continuously injects grout into the "fracture" to fill it into a completely "saturated" solid area. This completely fills the "fracture" that was hindering the drill pipe's progress, ultimately eliminating this obstacle and allowing the drill pipe to resume smooth drilling. In this way, existing boreholes can be avoided, saving significant amounts of manpower, material resources, and financial resources, greatly reducing expenses, improving the smoothness of construction operations, and increasing production efficiency. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram of the assembly structure of this utility model; Figure 4 for Figure 3 Enlarged structural diagram of the marked area; Figure 5 This is a schematic diagram of the assembly structure of a pressure control valve in its closed state. Figure 6 This is a schematic diagram of the assembly structure in the grouting state after the pressure control valve is opened.

[0017] The markings in the diagram are: 1. Grouting pipe, 101. Connector, 2. Sealing bag, 21. Clamp, 22. Protective belt, 3. Pressure control valve, 31. Valve body, 32. Sealing head, 33. Compression spring, 34. Piston head, 4. Guide sleeve, 41. Round sleeve, 42. Wing plate, 5. High-pressure grout outlet, 6. Grout inlet, 7. Connecting shaft, 8. Reversing sleeve, 81. Grout outlet channel. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0019] Example 1 As shown in the figure, this utility model discloses a fixed-point sealing and grouting integrated device for coal mine boreholes, which is used for sealing and grouting. It includes a grouting and sealing mechanism, a pressure control mechanism, and a guiding component. The grouting and sealing mechanism includes a grouting pipe 1 and a sealing bag 2 wrapped around the outer periphery of the grouting pipe 1. The tail end of the grouting pipe 1 is provided with a connector 101 for connecting to the drill rod. The sealing bag 2 is sleeved on the grouting pipe 1, and both ends of the sealing bag 2 are sealed and fastened by a clamp 21. The grouting pipe 1 has a grout inlet 6 on the pipe body located in the inner cavity of the sealing bag 2. The pressure control mechanism includes a pressure control valve 3 disposed at the front end of the grouting pipe 1; the guide assembly includes a guide sleeve 4 disposed at the front and rear ends of the grouting pipe 1, the outer diameter of the guide sleeve 4 being larger than the outer diameter of the grouting pipe 1 and adapted to the borehole diameter to be sealed, and the pressure control valve 3 being provided with a high-pressure grout outlet 5, so that after the grouting pressure in the grouting pipe 1 and the sealing bag 2 reaches the critical value of the pressure control valve 3, the high-pressure grout outlet 5 opens, allowing the grouting slurry to be discharged from the high-pressure grout outlet 5.

[0020] For connector 101: In this embodiment, as Figure 1 As shown, one end of the connector 101 is provided with a male head for connecting the grouting pipe 1, and the other end is provided with a female head for connecting the drill rod. The center hole of the connector 101 is in communication with the grouting pipe 1.

[0021] Regarding guide sleeve 4: In this embodiment, as Figure 1-3 As shown in Figure 5, the guide sleeve 4 includes a circular sleeve 41 and a plurality of wing plates 42 evenly distributed around the circumference of the circular sleeve 41. The wing plates 42 are all arranged radially along the circular sleeve 41, and the length of the wing plates 42 is adapted to the circular sleeve 41; and at least three wing plates 42 are evenly distributed around the circumference of the circular sleeve 41.

[0022] The guide sleeve 4 is made of wear-resistant hard non-metallic material, which is not easily deformed and can provide sufficient guiding sliding in the drilling space. Moreover, the wing plate structure of the guide sleeve 4 can also effectively avoid obstacles.

[0023] In addition, during the overall sliding of the device, in order to prevent the sealing bag 2 from being worn and damaged, a protective tape 22 is wrapped around the outside of the sealing bag 2. The protective bag 22 is a wear-resistant plastic film similar to tape, which can effectively protect the sealing bag 2 during the sliding process of the device and prevent the sealing bag 2 from being directly worn, thereby ensuring the sealing effect.

[0024] Regarding pressure control valve 3: In this embodiment, the pressure control valve 3 is a core component. Specifically, the pressure control valve 3 includes a valve body 31, a sealing head 32 disposed at the front end of the valve body 31, a compression spring 33 disposed in the inner cavity of the valve body 31, and a piston head 34 disposed at the rear end of the valve body 31. The high-pressure grout outlet 5 is disposed on the circumferential side wall of the valve body 31 corresponding to the piston head 34, so that when the grouting pressure is less than the deformation pressure of the compression spring 33, the piston head 34 seals the high-pressure grout outlet 5, and when the grouting pressure is greater than the deformation pressure of the compression spring 33, the piston head 34 is compressed and displaced, thereby releasing the seal on the high-pressure grout outlet 5.

[0025] Furthermore, the valve body 31 is provided with a connecting shaft 7 for connecting the grouting pipe 1 at its tail end. One end of the connecting shaft 7 is threaded to the end of the grouting pipe 1, and the other end is threaded to the end of the valve body 31. The connecting shaft 7 has a central hole that communicates with the grouting pipe 1.

[0026] In other words, the device of this application is divided into two stages during actual operation, based on the opening and closing time of the pressure control valve 3: the pressure holding and sealing stage and the grouting and filling stage. Specifically: Pressure holding and sealing stage: With the pressure control valve 3 closed, after the drill rod end is connected to the device of this application and placed into the blocked area of ​​the borehole that cannot advance, grouting begins to be continuously injected into the drill rod. The grout continuously entering the inner cavity of the drill rod will continuously flow out through the grout inlet 6 and be discharged into the sealing bag 2, continuously expanding the sealing bag 2 until the sealing bag 2 expands to completely seal the surrounding borehole area. In this state, grouting continues to be injected continuously, and the pressure in the sealing bag 2 remains constant, which is the pressure holding and sealing stage. Grouting and filling stage: Under the continuous pressure of the sealing bag 2, the continuously injected grout will squeeze the piston head 34 in the pressure control valve 3. When the squeezing pressure of the grout exceeds the deformation pressure of the compression spring 33, the piston head 34 will be pushed open, so that the pressure control valve 3 is fully opened. Then the continuously injected grout will be discharged from the high-pressure grout outlet 5 and continuously enter the "crack" to fill the "crack". This is the grouting and filling stage.

[0027] In addition, it should be noted that all components in the device of this application, except for the compression spring 33, are made of non-metallic materials.

[0028] Regarding the working principle of the device in this application: As described above, after encountering a "crack" during the drilling operation, the drill rod is pulled out, the device of this application is assembled to the front end of the drill rod, and then inserted into the borehole to the "crack". Then, the grouting equipment is connected, and grout is continuously injected into the drill rod at a constant pressure until the pressure holding and sealing stage is completed. Then, after the pressure control valve 3 is opened, grouting continues until the grouting and filling stage is completed, until the "crack" is completely filled, the obstacle to the advancement of the drill rod is removed, and the drill rod is taken out.

[0029] During the process of removing the drill rod, since the device of this application is located in the grouting and sealing area, the device of this application will remain in the borehole. After the drill rod is inserted into the drill bit, it will be placed into the borehole and drilling will begin. The sealing area and the filled "cracks" can be directly drilled through, and the device of this application will be completely crushed under the drilling of the drill bit.

[0030] Example 2 This embodiment is basically the same as the above embodiment in terms of implementation method. The only difference is that in this embodiment, in order to ensure that the slurry discharged from the high-pressure slurry outlet 5 flows out toward the "crack", a reversing sleeve 8 can be fitted around the circumference of the valve body 31. The inner diameter of the reversing sleeve 8 is larger than the outer diameter of the valve body 31, so as to form a slurry outlet channel 81 between the inner wall of the reversing sleeve 8 and the outer circumferential wall of the valve body 31, which receives the high-pressure slurry outlet 5. The slurry outlet channel 81 is sealed at the tail end and open at the front end, so that the slurry flowing vertically out of the high-pressure slurry outlet 5 is sprayed toward the front side of the valve body 31.

[0031] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mine-use fixed-point sealing and grouting integrated device, used for sealing and grouting coal mine boreholes, characterized in that: The device includes a grouting and sealing mechanism, a pressure control mechanism, and a guide assembly. The grouting and sealing mechanism includes a grouting pipe (1) and a sealing bag (2) surrounding the grouting pipe (1). The pressure control mechanism includes a pressure control valve (3) located at the front end of the grouting pipe (1). The guide assembly includes a guide sleeve (4) located at the front and rear ends of the grouting pipe (1). The outer diameter of the guide sleeve (4) is larger than the outer diameter of the grouting pipe (1) and is adapted to the diameter of the borehole to be sealed. The pressure control valve (3) is provided with a high-pressure grout outlet (5). When the grouting pressure in the grouting pipe (1) and the sealing bag (2) reaches the critical value of the pressure control valve (3), the high-pressure grout outlet (5) opens, allowing the grout to be discharged from the high-pressure grout outlet (5).

2. The integrated mine-use fixed-point sealing and injection device as described in claim 1, characterized in that: The sealing bag (2) is fitted onto the grouting pipe (1). Both ends of the sealing bag (2) are sealed and fastened by a clamp (21). The grouting pipe (1) has a grout inlet (6) on the pipe body located inside the sealing bag (2).

3. The integrated mine-use fixed-point sealing and injection device as described in claim 1, characterized in that: The end of the grouting pipe (1) is provided with a connector (101) for connecting the drill rod.

4. The integrated mine-use fixed-point sealing and injection device as described in claim 3, characterized in that: The connector (101) has a male end for connecting the grouting pipe (1) at one end and a female end for connecting the drill rod at the other end. The center hole of the connector (101) is connected to the grouting pipe (1).

5. The integrated mine-use fixed-point sealing and injection device as described in claim 1, characterized in that: The guide sleeve (4) includes a circular sleeve (41) and a plurality of wing plates (42) evenly distributed around the circumference of the circular sleeve (41). The wing plates (42) are arranged radially along the circular sleeve (41), and the length of the wing plates (42) is adapted to the circular sleeve (41).

6. The integrated mine-use fixed-point sealing and injection device as described in claim 5, characterized in that: The circular sleeve (41) is evenly provided with at least three wing plates (42) around its circumference.

7. The integrated mine-use fixed-point sealing and injection device as described in claim 1, characterized in that: The sealed bag (2) is wrapped with a protective strip (22).

8. The integrated mine-use fixed-point sealing and injection device as described in claim 1, characterized in that: The pressure control valve (3) includes a valve body (31), a sealing head (32) disposed at the front end of the valve body (31), a compression spring (33) disposed in the inner cavity of the valve body (31), and a piston head (34) disposed at the rear end of the valve body (31). The high-pressure slurry outlet (5) is disposed on the circumferential side wall of the valve body (31) corresponding to the piston head (34). When the grouting pressure is less than the deformation pressure of the compression spring (33), the piston head (34) seals the high-pressure slurry outlet (5). When the grouting pressure is greater than the deformation pressure of the compression spring (33), the piston head (34) is compressed and displaced with the compression spring (33), thereby breaking the seal on the high-pressure slurry outlet (5).

9. The integrated mine-use fixed-point sealing and injection device as described in claim 8, characterized in that: The valve body (31) is provided with a connecting shaft (7) for connecting the grouting pipe (1) at its tail end. One end of the connecting shaft (7) is threaded to the end of the grouting pipe (1), and the other end is threaded to the end of the valve body (31). The connecting shaft (7) has a central hole that is in communication with the grouting pipe (1).

10. The integrated mine-use fixed-point sealing and injection device as described in claim 8, characterized in that: The valve body (31) is circumferentially fitted with a reversing sleeve (8). The inner diameter of the reversing sleeve (8) is larger than the outer diameter of the valve body (31) so that a slurry outlet channel (81) is formed between the inner wall of the reversing sleeve (8) and the outer circumferential wall of the valve body (31) to receive the high-pressure slurry outlet (5). The slurry outlet channel (81) is sealed at the tail end and open at the front end so that the slurry flowing vertically through the high-pressure slurry outlet (5) is sprayed toward the front side of the valve body (31).

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