A grouting hole sealing device

Abstract

The application relates to a grouting hole sealing device and relates to the technical field of coal seam drilling gas extraction, which comprises a hole sealing assembly, the hole sealing assembly comprises a first sealing bag, the first sealing bag is located at the orifice of a drilling hole, a second sealing bag is located at the gas extraction end in the drilling hole, a grouting pipe is arranged on one side of a gas extraction pipe, and a slurry discharge pipe is arranged on the other side; a detection assembly comprises an air pressure detection pipe, the air pressure detection pipe penetrates the first sealing bag and the second sealing bag in sequence and extends out of the second sealing bag, the air pressure detection pipe is located on one side of the gas extraction pipe, the air pressure detection pipe is connected with a conveying pipeline, the other end of the conveying pipeline is connected with a high-pressure gas cylinder, a pressure regulating valve, an air pressure gauge, an on-off valve and a pressure gauge are sequentially arranged on the conveying pipeline, and the pressure regulating valve is installed at the end close to the high-pressure gas cylinder. The application has the effects of real-time monitoring of the air pressure state of a sealing area, verification of hole sealing quality and reduction of the influence of human factors.

Description

Technical Field

[0001] This application relates to the technical field of coal seam borehole gas extraction, and in particular to a grouting and sealing device. Background Technology

[0002] With the continuous increase in energy demand and the deepening of coal mining, gas drainage is a crucial link in ensuring safe production in coal mines. The sealing quality of coal seam boreholes directly affects the gas drainage effect. If the sealing is not tight, air will leak into the borehole, reducing the gas drainage concentration and potentially causing safety accidents such as gas explosions. Currently, when using grouting to seal coal seam boreholes, the common practice is to rely on workers' experience to control the grouting pressure and volume. This can easily lead to uneven grout distribution and residual air bubbles in the borehole, which in turn affects the sealing quality and gas extraction efficiency. In other words, there is a lack of effective detection methods in the sealing device, making it impossible to understand parameters such as gas pressure in the sealing area in real time, and making it difficult to determine whether the sealing is qualified. Utility Model Content

[0003] To address the problem of the lack of effective detection methods in sealing devices, the inability to understand parameters such as air pressure in the sealing area in real time, and the difficulty in determining whether the sealing is qualified, this application provides a grouting sealing device.

[0004] This application provides a grouting and sealing device, which adopts the following technical solution: A grouting and sealing device includes a sealing assembly and a detection assembly for sealing coal seam boreholes; The sealing assembly includes a gas extraction pipe, a grouting pipe, a grout discharge pipe, a first sealing bag, and a second sealing bag. The first sealing bag is located at the borehole opening, and the second sealing bag is located at the gas extraction end inside the borehole. The gas extraction pipe passes through the first and second sealing bags in sequence and extends out of the second sealing bag to extract gas. The grouting pipe passes through the first and second sealing bags in sequence, and the grout discharge pipe passes through the first sealing bag and extends out of the first sealing bag. The grouting pipe is located on one side of the gas extraction pipe, and the grout discharge pipe is located on the other side. The detection assembly includes a pressure detection tube that passes through the first and second sealing bags in sequence and extends out of the second sealing bag. The pressure detection tube is located on one side of the gas extraction pipe and is connected to a delivery pipe. The other end of the delivery pipe is connected to a high-pressure gas cylinder. A pressure regulating valve, a pressure gauge, a switch valve, and a pressure gauge are sequentially installed on the delivery pipe. The pressure regulating valve is installed at the end closest to the high-pressure gas cylinder.

[0005] By adopting the above technical solution, the first and second sealing bags in the sealing assembly form a double seal at the borehole opening and the gas extraction end, respectively, effectively preventing air leakage and providing a good environment for gas extraction. The gas extraction pipe can smoothly extract gas from the borehole, the grouting pipe is used to deliver grout into the borehole, and the grout discharge pipe can discharge excess grout, ensuring the grout filling effect. The detection assembly, through the cooperation of the pressure detection pipe, delivery pipeline, high-pressure gas cylinder, and various valves and instruments, can monitor the air pressure in the sealing area in real time, making it easier for operators to judge whether the sealing is qualified. Compared with the traditional sealing method that relies on experience, this improves the sealing quality and reliability. Optionally, a pressure-limiting burst valve is provided at one end of the grouting pipe near the second sealing bag. By adopting the above technical solution, the pressure-limiting burst valve can automatically burst when the pressure in the grouting pipe exceeds the set value, releasing the pressure and preventing the borehole wall from collapsing or the device from being damaged due to excessive grouting pressure, thus playing a protective role. At the same time, it can also indirectly reflect the grouting situation and ensure the safety and stability of the grouting process. Optionally, the input end of the grouting pipe is connected to a grouting pump, the grouting pipe is equipped with a one-way valve, the grouting pipe is equipped with a first grout outlet and a second grout outlet, the first grout outlet is correspondingly set with a first sealing bag, the second grout outlet is correspondingly set with a second sealing bag, and a control valve is respectively set on the grouting pipe at the first grout outlet and the second grout outlet. By adopting the above technical solution, the grouting pump provides power for grout delivery, and the one-way valve can prevent grout backflow and ensure the continuity of grouting. The first and second grout outlets correspond to the first and second sealing bags, respectively. With the help of the control valve, the flow rate of grout delivered to the two sealing bags can be controlled respectively, so as to achieve precise control of the expansion degree of the two bags, ensure the sealing effect, and improve the reliability of the sealing. Optionally, the discharge pipe passes through and extends out of the first sealing bag, and a filter screen is provided at the end of the discharge pipe. By adopting the above technical solution, the filter screen can filter impurities in the slurry, prevent impurities from clogging the slurry discharge pipe, and ensure smooth slurry discharge; the slurry discharge pipe will discharge excess slurry in time, avoiding excessive accumulation of slurry in the borehole and affecting the sealing effect, and at the same time, the slurry discharge situation can be used to judge whether the slurry filling is sufficient. Optionally, the gas extraction pipe includes multiple connecting pipes and extraction screen pipes. Adjacent connecting pipes are connected by connecting joints, and the other end of the connecting pipe located at one end is connected to the extraction screen pipe by a connecting joint. The extraction screen pipe is provided with multiple extraction holes. By adopting the above technical solution, the multiple connecting pipes are connected by connecting joints, which makes it easy to adjust the length of the gas extraction pipe according to the drilling depth, and has strong applicability; the multiple extraction holes on the extraction screen pipe can increase the gas extraction range, improve the gas extraction efficiency, and ensure the extraction effect. Optionally, the end of the extraction screen tube away from the connecting pipe is provided with a conical anti-clogging head.

[0006] By adopting the above technical solution, the conical anti-clogging head can play a guiding role in the process of the gas extraction pipe extending into the borehole, reduce the blockage of the extraction screen pipe by impurities in the borehole, and at the same time protect the end of the extraction screen pipe from damage, ensuring the smooth progress of gas extraction work. Optionally, the sealing assembly includes several guiding components. The guiding components are disposed inside the borehole and sleeved outside the gas extraction pipe. The guiding components include a guide plate, which is adapted to the inner wall of the borehole. The guide plate is provided with a first through hole for the gas extraction pipe to pass through, a second through hole for the grouting pipe to pass through, a third through hole for the grout discharge pipe to pass through, and a fourth through hole for the air pressure detection pipe to pass through. The guide plate is placed inside the borehole.

[0007] By adopting the above technical solution, the guide plate is adapted to the inner wall of the borehole, which can play a positioning and guiding role for the gas extraction pipe, grouting pipe, slurry discharge pipe and air pressure detection pipe, preventing the pipelines from shifting or shaking in the borehole, ensuring the stability of the position of each pipeline, and ensuring the normal operation of grouting, slurry discharge, gas extraction and air pressure detection. Optionally, the guide disk is provided with a plurality of arc-shaped buffers at intervals, and the outer wall of the guide disk is provided with a plurality of storage slots for installing elastic elements, and the other end of the elastic element is fixedly connected to the buffer. By adopting the above technical solution, the buffer component contacts the inner wall of the borehole. When the guide component moves or the borehole undergoes slight deformation, the elastic element deforms, causing the buffer component to perform buffering adjustment, reducing rigid collisions between the guide plate and the inner wall of the borehole, protecting the guide plate and the inner wall of the borehole, and at the same time enabling the guide component to better adapt to the condition of the inner wall of the borehole and improve the stability of the guide.

[0008] In summary, this application includes at least one of the following beneficial technical effects: 1. This device achieves effective sealing through the double-sealing bag of the sealing component, and combined with the detection component, it can monitor the gas pressure in the sealing area in real time, which solves the problems of traditional sealing relying on experience and lacking effective detection methods, and improves the sealing quality and gas extraction effect; 2. The guide components provide good positioning and guidance for each pipeline. The combination of buffer components and elastic elements can adapt to drilling conditions, reduce equipment damage, and improve the applicability and stability of the equipment. Attached Figure Description

[0009] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the guide component in the embodiments of this application.

[0010] Explanation of reference numerals in the attached figures: 1. Drilling; 2. Sealing assembly; 21. Gas extraction pipe; 211. Connecting pipe; 212. Extraction screen pipe; 2121. Extraction hole; 213. Anti-blocking head; 22. Grouting pipe; 221. Pressure limiting burst valve; 222. Grouting pump; 23. Grout discharge pipe; 231. Filter screen; 24. First sealing bag; 25. Second sealing bag; 3. Guide assembly; 31. Guide plate; 311. First through hole; 312. Second through hole; 313. Third through hole; 314. Fourth through hole; 32. Buffer; 33. Elastic element; 4. Detection assembly; 41. Air pressure detection pipe; 42. Delivery pipeline; 43. High-pressure gas cylinder; 44. Pressure regulating valve; 45. Air pressure gauge; 46. Switch valve; 47. Pressure gauge. Detailed Implementation

[0011] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0012] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0014] The following is in conjunction with the appendix Figure 1 and Figure 2 This application will be described in further detail.

[0015] This application discloses a grouting and sealing device, referring to... Figure 1 The grouting and sealing device includes a sealing assembly 2 and a detection assembly 4 for sealing the coal seam borehole 1; The sealing assembly 2 includes a gas extraction pipe 21, a grouting pipe 22, a grout discharge pipe 23, a first sealing bag 24, and a second sealing bag 25. The first sealing bag 24 is located at the borehole opening of borehole 1, and the second sealing bag 25 is located at the gas extraction end inside borehole 1. The gas extraction pipe 21 passes through the first sealing bag 24 and the second sealing bag 25 in sequence and extends out of the second sealing bag 25 to extract gas. The grouting pipe 22 passes through the first sealing bag 24 and the second sealing bag 25 in sequence, and the grout discharge pipe 23 passes through the first sealing bag 24 and extends out of the first sealing bag 24. The grouting pipe 22 is provided on one side of the gas extraction pipe 21, and the grout discharge pipe 23 is provided on the other side. The detection component 4 includes a pressure detection tube 41, which passes through the first sealing bag 24 and the second sealing bag 25 in sequence and extends out of the second sealing bag 25. The pressure detection tube 41 is located on one side of the gas extraction pipe 21. The pressure detection tube 41 is connected to a delivery pipe 42, and the other end of the delivery pipe 42 is connected to a high-pressure gas cylinder 43. A pressure regulating valve 44, a pressure gauge 45, a switch valve 46 and a pressure gauge 47 are sequentially installed on the delivery pipe 42. The pressure regulating valve 44 is installed at the end close to the high-pressure gas cylinder 43.

[0016] In this grouting and sealing device, one end of the gas extraction pipe 21 of the sealing component 2 extends into the gas-rich area inside the borehole 1, and the other end is connected to the extraction equipment, directly used to extract gas from the coal seam. The gas extraction pipe 21 passes through the first sealing bag 24 and the second sealing bag 25, ensuring directional gas extraction under the premise of sealing the borehole. The grouting pipe 22 is used to transport grout, pumping the sealing grout (such as cement grout, polymer materials, etc.) from the outside into the annular space between the first sealing bag 24 and the second sealing bag 25, filling the gap between the borehole 1 and the casing to form a sealing structure. The setting of the gas extraction pipe 21 passing through the first sealing bag 24 and the second sealing bag 25 ensures that the grout can be accurately injected into the target sealing area. By controlling the flow rate and pressure of the grouting pipe 22, the grout distribution can be effectively adjusted, reducing voids and air bubbles, and improving the tightness of the sealing.

[0017] The grout discharge pipe 23 serves as an air venting and grout discharge channel during the grouting process. One end of the grout discharge pipe 23 is located in the sealing area between the first sealing bag 24 and the second sealing bag 25, while the other end leads to the outside of the borehole 1. It is used to discharge air and excess grout from the sealing area during the grouting process, ensuring that the grout fills the entire sealing space. This solves the problem of air bubbles forming due to residual air in traditional grouting. The air venting and grout discharge process allows for a direct assessment of whether the sealing area is completely filled with grout, improving the controllability of the sealing quality. At the same time, the discharge of excess grout avoids material waste and blockage of the borehole 1.

[0018] The first sealing bag 24 expands by inflating or filling with grout and fits tightly against the inner wall of the borehole 1, forming the first sealing barrier. This blocks the flow of air between the borehole and the outside, while also defining the boundary of the grouting area to prevent grout from overflowing from the borehole. This achieves the initial sealing of the borehole, reduces the concentration dilution during gas extraction, and improves the stability of the grouting pressure.

[0019] The second sealing bag 25 forms a gap with the first sealing bag 24. After the second sealing bag 25 expands, it also fits tightly against the inner wall of the borehole 1, forming the other boundary of the sealing area. Together with the first sealing bag 24, it defines the space range for grouting and filling, preventing the grout from flowing into the depth of the borehole 1.

[0020] In the detection component 4, the air pressure detection tube 41 serves as a channel for air pressure detection, transmitting air pressure signals from the sealing area and the gas end to external detection equipment. This enables real-time monitoring of the sealing effect after sealing, solving the problem of traditional sealing technology lacking direct detection methods. By directly acquiring the air pressure data inside the hole, the tightness of the seal can be judged in real time. If leakage occurs, the air pressure will change abnormally, facilitating timely detection of problems and the implementation of remedial measures.

[0021] High-pressure gas cylinder 43 serves as the gas source for pressure testing, providing stable high-pressure gas to the pressure testing tube 41 via pipeline 42. This is used to simulate or test the pressure-bearing capacity of the sealed area, verifying the pressure resistance and sealing reliability after sealing. By injecting high-pressure gas, the sealing performance of the sealing structure can be actively tested, rather than passively waiting for gas leakage, improving the initiative and accuracy of the test and ensuring that the sealing quality meets safety standards. Pressure regulating valve 44 is used to adjust the gas pressure output from high-pressure gas cylinder 43, precisely controlling the gas pressure injected into the pressure testing tube 41 according to testing requirements. This avoids damage to the sealing structure due to excessive pressure or testing failure due to insufficient pressure, adapting to different coal seam conditions and sealing requirements, ensuring the safety of the testing process and the reliability of the data.

[0022] The pressure gauge 45 is used to display the real-time pressure value of the gas output from the high-pressure gas cylinder 43 after adjustment, providing operators with an intuitive reference for pressure parameters and ensuring that the injection pressure meets the preset detection standards. Through real-time pressure readings, operators can accurately grasp the injection pressure status and adjust the pressure regulating valve 44 in a timely manner to ensure the stability of the detection pressure, providing a quantitative basis for evaluating sealing performance.

[0023] The on / off valve 46 controls the opening and closing of the delivery pipeline 42. It closes to block gas flow when not in detection mode, and opens during detection to allow high-pressure gas to enter the pressure detection pipe 41, enabling flexible control of the detection process and improving the operational convenience and safety of the detection system. The pressure gauge 47 monitors the actual gas pressure entering the borehole 1, reflecting the pressure-bearing state of the sealing area and directly indicating the sealing effect. Stable pressure indicates a good seal, while a pressure drop indicates leakage. This solves the problem of traditional technology where sealing quality could only be indirectly inferred from gas concentration, achieving real-time, quantitative evaluation of the sealing effect.

[0024] This grouting and sealing device, through the coordinated operation of the sealing component 2 and the detection component 4, achieves efficient sealing and quality inspection of the coal seam borehole 1, ensuring both the unobstructed flow of the gas extraction channel and the controllable and measurable sealing effect. Specifically, the sealing component 2 defines the sealing area using double-sealing bags, and uses the grouting pipe 22 and the grout discharge pipe 23 to complete the injection and venting of grout, forming a tight sealing structure. This solves the problems of uneven grout distribution and residual air bubbles, resulting in a more robust sealing structure that reduces the risk of air leakage and gas escape, fundamentally improving the stability of the sealing quality. The detection component 4, through the air pressure detection pipe 41 and various valves, instruments, and other supporting equipment, monitors the air pressure status of the sealing area in real time, verifying the sealing quality. This changes the previous reliance on worker experience, reducing the influence of human factors. Through air pressure monitoring, the sealing effect can be evaluated in real time, sealing defects can be detected and remedied in a timely manner, avoiding the passive phenomenon of discovering problems only during later gas extraction, and reducing safety hazards.

[0025] A pressure-limiting burst valve 221 is installed at one end of the grouting pipe 22 near the second sealing bag 25. The pressure-limiting burst valve 221 is used to monitor the grout pressure in the grouting pipe 22. When the pressure exceeds a preset safety threshold, the pressure-limiting burst valve 221 will automatically burst open to release the excessive pressure and discharge some grout. When the pressure drops to a safe range, it can be automatically closed or kept open to continuously relieve pressure, depending on the design. The pressure-limiting burst valve 221 can prevent sealing failure caused by pressure overload, avoid excessive grouting pressure from rupturing the first sealing bag 24 or the second sealing bag 25 or damaging the borehole 1 structure, ensure the integrity of the sealing assembly 2, and maintain the sealing of the sealing area.

[0026] In this application, the two ends of the first sealing bag 24 and the second sealing bag 25 can be fixed to the outer wall of the gas extraction pipe 21 and other pipe fittings by means of a strapping strap, or the first sealing bag 24 and the second sealing bag 25 can be fixed to the outer wall of the gas extraction pipe 21 and other pipe fittings by means of a ring clamp, so as to achieve the fixation and sealing of the first sealing bag 24 and the second sealing bag 25.

[0027] The grouting pipe 22 is connected to a grouting pump 222 at its input end. A one-way valve is installed on the grouting pipe 22. A first grout outlet and a second grout outlet are also installed on the grouting pipe 22. The first grout outlet corresponds to the first sealing bag 24, and the second grout outlet corresponds to the second sealing bag 25. Control valves are installed on the grouting pipe 22 at both the first and second grout outlets. After grouting of the bags is completed, the corresponding control valve is closed, and the grouting process switches to grouting the area between the two bags, achieving step-by-step sealing. The grouting pump 222 can extract and pressurize grout from the storage device and deliver it to the grouting pipe 22, providing a continuous power source for the flow of grout in the grouting pipe 22, propelling the grout towards the sealing area, and ensuring the continuity of the grouting process. Grouting pump 222 is a pressure-visual grouting pump. The pressure-visual grouting pump is used to extract grout and pressurize it to deliver it to grouting pipe 22. It also has the function of displaying grouting pressure in real time, so that operators can intuitively understand the pressure changes during the grouting process and easily detect abnormal pressure in time.

[0028] The one-way valve is used to control the flow direction of the grout, allowing the grout to flow unidirectionally from the grouting pump 222 to the sealing area, preventing the grout from flowing back under pressure changes, and preventing the injected grout from flowing back to the front end of the grouting pump 222 or the grouting pipe 22, thus ensuring the effective maintenance of pressure during the grouting process.

[0029] The first grout outlet is the channel through which grout enters the first sealing bag 24. When grout flows through this outlet, it enters the first sealing bag 24, providing a grout source for the expansion of the first sealing bag 24. This ensures that the first sealing bag 24 can expand smoothly and fit tightly against the inner wall of the borehole 1, thus fulfilling its sealing function. The second grout outlet serves as the channel for grout to enter the second sealing bag 25, allowing grout to flow into the interior of the second sealing bag 25. This causes the second sealing bag 25 to expand and form an effective seal against the inner wall of the borehole 1. Together with the first sealing bag 24, it defines a closed grouting area, providing a foundation for subsequent grouting and sealing. The control valve is used to control the opening and closing of the corresponding grout outlet, as well as to adjust the flow rate and pressure of the grout entering the sealing bag through the grout outlet. This enables independent control of the grouting process of the first sealing bag 24 and the second sealing bag 25. The expansion degree of the two sealing bags can be flexibly adjusted according to actual needs to ensure that they can reach a suitable sealing state, thereby improving the flexibility and accuracy of the grouting operation.

[0030] The grout discharge pipe 23 passes through and extends out of the first sealing bag 24. A filter screen 231 is provided at the end of the grout discharge pipe 23. The filter screen 231 filters the material discharged through the grout discharge pipe 23, blocking solid particles or impurities in the grout from causing blockage when they flow out of the grout discharge pipe 23. This ensures that air and excess grout can be discharged continuously and smoothly, avoiding abnormal grouting pressure caused by grout discharge obstruction. The gas extraction pipe 21 includes multiple connecting pipes 211 and extraction screen pipes 212. Adjacent connecting pipes 211 are connected by connecting joints, and the other end of the connecting pipe 211 located at one end is connected to the extraction screen pipe 212 via a connecting joint. Multiple extraction holes 2121 are provided on the extraction screen pipe 212. The connecting pipes 211 serve as the main pipeline component of the gas extraction pipe 21. The multiple connecting pipes 211 are sequentially connected to form the main framework of the extraction channel, used to transport gas extracted from the coal seam, conveying the gas from the extraction area to the outside. The multi-segment combination extends the overall length of the extraction pipe, allowing it to penetrate deep into the target extraction location in the coal seam, providing basic pipeline support for long-distance gas transportation and ensuring the stability of the gas during transportation. The connecting joint is used to realize the detachable connection between the pipeline sections, firmly splicing the different parts of the pipeline together to form a complete extraction channel, ensuring the tightness of the connection between the pipeline sections, preventing gas leakage from the connection points during transportation, and facilitating the installation, disassembly and maintenance of the pipeline, thus improving the flexibility of the gas extraction pipe 21 assembly. The extraction screen 212 is the part that directly contacts the gas source, providing an inlet channel for gas to enter the extraction pipe, allowing gas in the coal seam to smoothly enter the gas extraction pipe 21. The extraction hole 2121 is the channel for gas to enter the interior of the extraction screen 212 from the coal seam, allowing gas in the coal seam to flow into the extraction screen 212 through these holes, and then into the entire extraction pipeline system.

[0031] The end of the extraction screen 212 away from the connecting pipe 211 is provided with a conical anti-blocking head 213. The anti-blocking head 213 guides the extraction screen 212 to smoothly enter the target area during the process of the extraction screen 212 penetrating into the coal seam, while preventing impurities in the coal seam from directly contacting the end opening of the extraction screen 212 and the extraction hole 2121.

[0032] In addition, refer to Figure 1 and Figure 2 The sealing assembly 2 includes several guide assemblies 3, which are disposed inside the borehole 1 and sleeved on the outside of the gas extraction pipe 21. Each guide assembly 3 includes a guide plate 31, which is adapted to the inner wall of the borehole 1. The guide plate 31 has a first through hole 311 for the gas extraction pipe 21, a second through hole 312 for the grouting pipe 22, a third through hole 313 for the grout discharge pipe 23, and a fourth through hole 314 for the air pressure detection pipe 41. The guide plate 31 is placed inside the borehole 1. The guide plate 31's shape is adapted to the inner wall of the borehole 1, allowing it to fit snugly against the inner wall and be stably positioned, enhancing the stability of the guide assembly 3 within the borehole 1 and preventing the guide assembly 3 and the connected pipe 211 from shaking or shifting within the borehole 1, thus providing stable support for each pipeline. The first through hole 311 is used to pass through the gas extraction pipe 21, limiting the installation path of the gas extraction pipe 21 and ensuring that the gas extraction pipe 21 can extend in the borehole 1 along the preset direction, ensuring the smooth flow of the gas extraction channel. The second through hole 312 is used to pass through the grouting pipe 22, guiding and positioning the direction of the grouting pipe 22, so that the grouting pipe 22 can reach the target grouting area according to the preset path, providing path guarantee for the smooth progress of the grouting process. The third through hole 313 allows the grout discharge pipe 23 to pass through, fixing the installation position of the grout discharge pipe 23 and guiding the grout discharge pipe 23 to extend to the grout discharge area along the preset route. The fourth through hole 314 is used to pass through the air pressure detection pipe 41, standardizing the installation path of the air pressure detection pipe 41, so that the air pressure detection pipe 41 can accurately reach the detection area, ensuring that it can accurately obtain the air pressure data of the sealing area.

[0033] The guide assembly 3 is adapted and fixed to the inner wall of the borehole 1 through the guide plate 31. The gas extraction pipe 21, grouting pipe 22, grout discharge pipe 23 and air pressure detection pipe 41 are respectively inserted and positioned through the first through hole 311 to the fourth through hole 314, so as to guide each pipeline to maintain the preset relative position and direction in the borehole 1, avoid the pipeline from getting tangled or deviating, and ensure that each pipeline can function normally. Furthermore, the guide disk 31 is provided with multiple arc-shaped buffer members 32 at intervals on its outer side, and the outer wall of the guide disk 31 is provided with several slots for mounting elastic elements 33. The other end of the elastic element 33 is fixedly connected to the buffer member 32. The buffer member 32 directly contacts the inner wall of the borehole 1, adapting to the shape of the inner wall of the borehole 1 through its own arc-shaped structure, and forming a contact buffer layer between the guide disk 31 and the inner wall of the borehole 1. The elastic element 33 uses its own elastic deformation characteristics to transmit the force on the buffer member 32 and provide elastic support for the buffer member 32.

[0034] The elastic element 33 absorbs the impact force between the guide plate 31 and the inner wall of the borehole 1 through elastic deformation. When the buffer 32 is compressed, the elastic element 33 can adjust the position of the buffer 32 by telescoping, so that the buffer 32 always remains in contact with the inner wall of the borehole 1, enhancing the adaptability of the guide assembly 3. The elastic element 33 can be a rigid spring. The storage slot provides installation space for the elastic element 33, limits the position of the elastic element 33, and ensures that the elastic element 33 can stably connect the guide plate 31 and the buffer 32. The implementation principle and process of a grouting and sealing device according to an embodiment of this application are as follows: First, the gas extraction pipe 21, grouting pipe 22, grout discharge pipe 23, and air pressure detection pipe 41 are passed through the corresponding through holes of the guide assembly 3, so that the guide assembly 3 is fitted outside the gas extraction pipe 21 and placed inside the borehole 1. The guide plate 31 is adapted to the inner wall of the borehole 1 through the buffer 32 and the elastic element 33 to ensure that each pipeline maintains a stable direction inside the borehole 1. Then, the first sealing bag 24 is installed at the borehole opening of the borehole 1, and the second sealing bag 25 is placed at the gas extraction end inside the borehole 1. The control valve of the grouting pipe 22 controls the first grout outlet and the second grout outlet to inject grout into the two sealing bags, so that the bags expand and fit tightly against the inner wall of the borehole 1 to form a closed grouting area. The pressure-visible grouting pump is started, and grout is delivered to the area between the first sealing bag 24 and the second sealing bag 25 through the grouting pipe 22. A one-way valve prevents grout backflow and ensures stable grouting pressure. During grouting, the filter screen 231 at the end of the grout discharge pipe 23 filters impurities, ensuring that air and excess grout are discharged smoothly until pure grout flows out of the grout discharge pipe 23, indicating that the area has been filled with grout. At the same time, the high-pressure gas cylinder 43 is connected through the air pressure detection pipe 41 of the detection component 4. The switch valve 46 is opened and the pressure regulating valve 44 is adjusted. The pressure gauge 47 is used to monitor the air pressure change in the sealing area to determine whether the seal is tight. If the pressure is stable, the sealing is qualified; if the pressure drops, grout can be added through the grouting system until the sealing standard is reached, and the sealing operation of the coal seam borehole 1 is finally completed.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grouting and sealing device, characterized in that: Includes a sealing assembly (2) and a detection assembly (4) for sealing coal seam boreholes (1); The sealing assembly (2) includes a gas extraction pipe (21), a grouting pipe (22), a slurry discharge pipe (23), a first sealing bag (24), and a second sealing bag (25). The first sealing bag (24) is located at the opening of the borehole (1), and the second sealing bag (25) is located at the gas extraction end inside the borehole (1). The gas extraction pipe (21) passes through the first sealing bag (24) and the second sealing bag (25) in sequence and extends out of the second sealing bag (25) to extract gas. The grouting pipe (22) passes through the first sealing bag (24) and the second sealing bag (25) in sequence. The slurry discharge pipe (23) passes through the first sealing bag (24) and extends out of the first sealing bag (24). The grouting pipe (22) is provided on one side of the gas extraction pipe (21), and the slurry discharge pipe (23) is provided on the other side. The detection component (4) includes a pressure detection tube (41), which passes through the first sealing bag (24) and the second sealing bag (25) in sequence and extends out of the second sealing bag (25). The pressure detection tube (41) is located on one side of the gas extraction pipe (21). The pressure detection tube (41) is connected to a delivery pipe (42). The other end of the delivery pipe (42) is connected to a high-pressure gas cylinder (43). A pressure regulating valve (44), a pressure gauge (45), a switch valve (46), and a pressure gauge (47) are sequentially installed on the delivery pipe (42). The pressure regulating valve (44) is installed at one end close to the high-pressure gas cylinder (43).

2. The grouting and sealing device according to claim 1, characterized in that: A pressure-limiting burst valve (221) is installed at one end of the grouting pipe (22) near the second sealing bag (25).

3. The grouting and sealing device according to claim 1, characterized in that: The grouting pipe (22) is connected to a grouting pump (222) at its input end. A one-way valve is provided on the grouting pipe (22). The grouting pipe (22) is provided with a first grout outlet and a second grout outlet. The first grout outlet is corresponding to the first sealing bag (24), and the second grout outlet is corresponding to the second sealing bag (25). A control valve is provided on the grouting pipe (22) at the first grout outlet and the second grout outlet, respectively.

4. The grouting and sealing device according to claim 1, characterized in that: The discharge pipe (23) passes through and extends out of the first sealing bag (24), and a filter screen (231) is provided at the end of the discharge pipe (23).

5. The grouting and sealing device according to claim 1, characterized in that: The gas extraction pipe (21) includes multiple connecting pipes (211) and extraction screen pipes (212). Adjacent connecting pipes (211) are connected by connecting joints, and the other end of the connecting pipe (211) located at the end is connected to the extraction screen pipe (212) by a connecting joint. The extraction screen pipe (212) is provided with multiple extraction holes (2121).

6. The grouting and sealing device according to claim 5, characterized in that: The end of the extraction screen (212) away from the connecting pipe (211) is provided with a conical anti-clogging head (213).

7. The grouting and sealing device according to claim 1, characterized in that: The sealing assembly (2) includes several guide assemblies (3). The guide assemblies (3) are disposed inside the borehole (1) and sleeved outside the gas extraction pipe (21). The guide assemblies (3) include a guide plate (31). The guide plate (31) is adapted to the inner wall of the borehole (1). The guide plate (31) is provided with a first through hole (311) for passing through the gas extraction pipe (21), a second through hole (312) for passing through the grouting pipe (22), a third through hole (313) for passing through the grout discharge pipe (23), and a fourth through hole (314) for passing through the air pressure detection pipe (41). The guide plate (31) is placed inside the borehole (1).

8. The grouting and sealing device according to claim 7, characterized in that: The guide disk (31) is provided with a plurality of arc-shaped buffer members (32) at intervals. The outer wall of the guide disk (31) is provided with a plurality of storage slots for installing elastic elements (33). The other end of the elastic element (33) is fixedly connected to the buffer member (32).

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