A multi-section water injection hole sealing device for measuring mine rock stratum fissure

Abstract

The application relates to the technical field of mines, and provides a multi-section type water injection hole sealing device for measuring mine rock stratum fissures, which is arranged in a closed drill hole at one end of a mine rock stratum and comprises N bag hole sealers arranged along the length direction of the drill hole, each bag hole sealer is provided with a grouting pipe and a water injection pipe, the grouting pipe and the water injection pipe of two adjacent bag hole sealers are connected in communication through a medium slurry pipe and a medium water pipe respectively, N is a positive integer, the grouting pipe is used for injecting expansion medium into the bag hole sealer, a plurality of bag hole sealers are sequentially injected with expansion medium from inside to outside along the length direction of the drill hole to expand and seal the drill hole, and the water injection pipe is used for injecting water into one end of the corresponding bag hole sealer close to the closed end of the drill hole. The multi-section type water injection hole sealing device for measuring mine rock stratum fissures has the advantages that the drill hole fissures between the two ends can be simultaneously measured, repeated operation is not needed, and the measurement efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of mining technology, and in particular to a multi-stage water injection and sealing device for measuring rock strata fissures in mines. Background Technology

[0002] Coal seam mining causes displacement, deformation, and damage to the overlying strata, ultimately forming the so-called "three-zone" damage pattern. This can lead to surface subsidence, loss of surface or groundwater, mine water inrush or bursts, and gas disasters, threatening surface ecology and underground mining safety. Therefore, determining the development height and characteristics of the three zones is of great guiding significance for gas control, water prevention and control, and optimization of coal mining technology during coal mine production. Currently, commonly used techniques for observing roof three-zone damage in the field include borehole inspection, microseismic methods, and water injection leakage methods. The most intuitive and convenient method for field operation is the water injection leakage method. However, most borehole sealing devices currently using the water injection leakage method can only measure the fracture conditions of a single borehole sealing section, and cannot simultaneously measure the fracture conditions of "three-zone" damage over multiple lengths of the borehole, requiring repeated operations and affecting the overall measurement efficiency. Summary of the Invention

[0003] The purpose of this application is to provide a multi-stage water injection sealing device for measuring rock strata fractures in mines, so as to solve or alleviate the problems existing in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution: This application provides a multi-stage water injection sealing device for measuring fractures in mine rock formations, which is placed in a borehole sealed at one end of the mine rock formation. Its features include: N bag-shaped sealing devices are arranged along the length of the borehole. Each bag-shaped sealing device is equipped with a grouting pipe and a water injection pipe. The grouting pipe and the water injection pipe of two adjacent bag-shaped sealing devices are connected through a medium grout pipe and a medium water pipe, respectively. N is a positive integer. The grouting pipe is used to inject expansion medium into the bag sealer. Multiple bag sealers are injected with expansion medium sequentially from the inside to the outside along the length of the borehole to expand and seal the borehole. The water injection pipe is used to inject water into the end of the corresponding bag sealer near the sealed end of the borehole to perform segmented synchronous measurement of rock fractures.

[0005] Optionally, both ends of the water injection pipe are located outside the bladder sealing device, and a remote-controlled three-way valve is connected between the water injection pipes of two adjacent bladder sealing devices to inject water into the corresponding borehole sealing section.

[0006] Optionally, the remote control three-way valve is connected between the medium water pipe and one of the water injection pipes. Both the medium water pipe and the water injection pipe have a groove for placing wires along their length. The water injection pipe is sealed to its corresponding bladder sealer. A control line for connecting the remote control three-way valve is provided in the groove for transmitting control signals for opening and closing the remote control three-way valve.

[0007] Optionally, except for the bag sealer located at the innermost side of the borehole, pressure control valves are provided on the grouting pipes of the remaining N-1 bag sealers, and the preset calibrated pressure of the pressure control valves provided in the bag sealers gradually increases from the inside to the outside along the length of the borehole.

[0008] Optionally, one end of the grouting pipe is located inside the bladder sealing device, and the other end is located outside the bladder sealing device. The pressure control valve is installed inside the corresponding bladder sealing device. One end of the pressure control valve is connected to the end of the grouting pipe located inside the bladder sealing device, and the other end of the pressure control valve is connected to the medium grout pipe.

[0009] Optionally, the grouting pipe of the bag sealer located on the outermost side of the borehole is connected to an expansion medium injection assembly, and the water injection pipe of the bag sealer is connected to a water injection assembly.

[0010] Optionally, the water injection assembly includes a water inlet pipe, on which a first flow meter and a control valve are installed; the water inlet pipe is connected to or connected to at least one medium water pipe adjacent to the water injection pipe.

[0011] Optionally, the expansion medium injection assembly includes a medium input pipe, on which a second flow meter and a valve switch are provided, and the medium input pipe is connected to the adjacent medium slurry pipe.

[0012] Optionally, the bag sealing device includes an elastic bag body, with sealing caps at both ends of the elastic bag body. The water injection pipe and the grout injection pipe both pass through the sealing caps and are sealed to the sealing caps.

[0013] Optionally, the outer surface of the elastic bladder is provided with several elastic friction rings, the cross-section of which is triangular; an elastic sealing ring is provided between adjacent friction rings, the elastic sealing ring being disposed on the outer surface of the elastic bladder.

[0014] Beneficial effects: The multi-segment water injection and sealing device for measuring rock strata fractures provided in this application embodiment can measure borehole fractures by injecting water between adjacent bag sealers, and can also measure fractures by injecting water between the bag sealer and the closed end of the borehole, realizing multi-segment water injection measurement and simultaneously measuring borehole fractures at multiple intervals without the need for repeated operations, thus improving the efficiency of measurement. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1 This is a schematic diagram illustrating the application of a multi-stage water injection sealing device for measuring rock strata fractures in a mine, according to some embodiments of this application. Figure 2 This is a schematic diagram of a bag sealer for measuring water injection components in rock strata fractures in mines, according to some embodiments of this application; Figure 3 This is a schematic diagram of a bag-shaped sealing device located at the innermost part of a borehole in rock strata in a mine, according to some embodiments of this application. Figure 4 This is a schematic diagram illustrating the application of a multi-stage water injection sealing device for measuring rock strata fractures in a mine, according to another embodiment of this application.

[0016] Explanation of reference numerals in the attached figures: 1. Bag sealing device; 101. Elastic bag body; 102. Sealing cap; 103. Friction ring with increased resistance; 104. Elastic sealing ring; 105. Grouting pipe; 106. Water injection pipe; 2. Medium grout pipe; 3. Medium water pipe; 4. Remote control three-way valve; 5. Pressure control valve; 6. Expansion medium injection assembly; 601. Medium input pipe; 602. Second flow meter; 603. Valve switch; 7. Water injection assembly; 701. Water inlet pipe; 702. First flow meter; 703. Control valve. Detailed Implementation

[0017] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will understand that modifications and variations can be made to the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention should fall within the scope of protection of the embodiments of the present invention.

[0018] In one embodiment of this application, such as Figures 1-3 As shown, a multi-stage water injection sealing device for measuring fractures in mine rock strata is disclosed. It is placed inside a borehole in the mine rock strata that is closed at one end. The borehole is open at one end and closed at the other, and is not continuous. The diameter of the borehole is typically 75-120 mm. This multi-stage water injection sealing device includes N bag-shaped sealing devices 1 arranged along the length of the borehole, where N is a positive integer. The basic external structure of the bag-shaped sealing device 1 adopts the capsule or bag design found in existing sealing devices, and is made of silicone or rubber, possessing elasticity. The bag-shaped sealing device 1 includes an elastic capsule 101, with sealing caps 102 at both axial ends of the elastic capsule 101. The sealing caps 102 are bonded to the elastic capsule 101 with sealant or fixed with bolts, and sealing gaskets are provided at the connection points. This design facilitates the pre-installation of a pressure control valve 5 within the elastic bladder 101, followed by resealing both ends of the elastic bladder 101 using the sealing cap 102. When installing the pressure control valve 5, the elastic bladder 101 can be pressurized to expand it, causing the sealing cap 102 to elastically deform, allowing the pressure control valve 5 to enter the elastic bladder 101 and connect it to the grouting pipe 105. The elastic bladder 101 is then sealed using the sealing cap 102. Both the water injection pipe 106 and the grouting pipe 105 pass through the sealing cap 102 and are sealed to it. The outer surface of the elastic bladder 101 is provided with several elastic friction rings 103 made of rubber. The friction-enhancing ring 103 has a triangular cross-section and directly contacts the borehole wall. Under expansion pressure, it embeds itself into the borehole wall, increasing the pressure-bearing capacity of the bag sealer 1. An elastic sealing ring 104 is provided between adjacent friction-enhancing rings 103. The elastic sealing ring 104 is located on the outer surface of the elastic bladder 101. The elastic sealing ring 104 further enhances the sealing effect between the bag sealer 1 and the borehole wall, preventing leakage. The elastic sealing ring 104 is made of rubber.

[0019] Each bag sealer 1 is equipped with a grouting pipe 105 and a water injection pipe 106. The water injection pipe 106 is arranged along the length or axial direction of the bag sealer 1 and passes through the sealing caps 102 at both ends of the bag sealer 1. Both ends of the water injection pipe 106 are located outside the bag sealer 1. One end of the grouting pipe 105 is located inside the bag sealer 1, which facilitates the direct injection of the expansion medium into the bag sealer 1 to inflate it. The other end is located outside the bag sealer 1 and is connected to the grouting pipes 105 or medium slurry pipes 2 of other bag sealers 1. Both the grouting pipe 105 and the water injection pipe 106 are sealed to the sealing caps 102 through which they pass. The expansion medium can be cement slurry or other solidifiable liquid mixtures, or water or other recyclable expansion media. A filter screen is provided at the end of the water injection pipe 106 away from the bag sealer 1. The filter screen helps to remove particles and impurities from the water when recycling the discharge flow, preventing pipe blockage.

[0020] Among them, the grouting pipe 105 and water injection pipe 106 of the two adjacent bag sealing devices 1 are connected through the medium grout pipe 2 and the medium water pipe 3, respectively.

[0021] The grouting pipe 105 is used to inject expansion medium into the bag sealer 1. Multiple bag sealers 1 are injected with expansion medium sequentially from the inside to the outside along the length of the borehole to expand and seal the borehole. Except for the bag sealer 1 located at the innermost edge of the borehole, each of the remaining N-1 bag sealers 1 has a pressure control valve 5 installed on its grouting pipe 105. The preset calibrated pressure of the pressure control valve 5 installed inside the bag sealer 1 gradually increases from the inside to the outside along the length of the borehole. One end of the grouting pipe 105 is located inside the bag sealer 1, and the other end is located outside the bag sealer 1. The pressure control valve 5 is installed inside the corresponding bag sealer 1. One end of the pressure control valve 5 is connected to the end of the grouting pipe 105 inside the bag sealer 1, and the other end is connected to the medium grout pipe 2. The pressure control valve 5 can be an overflow valve or a pressure relief valve, selected as needed; in this embodiment, a pressure relief valve is used.

[0022] Both ends of the water injection pipe 106 are located outside the bag sealer 1. A remote control three-way valve 4 is connected between the water injection pipes 106 of two adjacent bag sealers 1. The remote control three-way valve 4 is connected between the medium water pipe 3 and one of the water injection pipes 106. A wire groove is provided along the length of both the medium water pipe 3 and the water injection pipe 106. The water injection pipe 106 is sealed to the sealing cap 102 of its corresponding bag sealer 1. A control line for connecting the remote control three-way valve 4 is provided in the wire groove to transmit control signals for opening and closing the remote control three-way valve 4, thereby injecting water into the corresponding borehole sealing section. In this embodiment, the remote control three-way valve 4 is an electromagnetic three-way valve, and the control line is a data line. The remote control three-way valve 4 on the water injection pipe 106 is used to inject water into the end of the corresponding bag sealer 1 near the borehole sealing end. At the same time, the opening and closing of the three-way valve does not affect the transmission of water flow to other bag sealers 1, so as to perform segmented synchronous measurement of rock fractures. The remote control three-way valve 4 is equipped with a pressure sensor to detect the water injection pressure.

[0023] The grouting pipe 105 of the outermost bladder sealer 1 is connected to an expansion medium injection component 6, and the water injection pipe 106 of the bladder sealer 1 is connected to a water injection component 7; the water injection component 7 is used to inject water into the water injection pipe 106, and the expansion medium injection component 6 is used to inject grout into the bladder sealer 1 through the grouting pipe 105.

[0024] The water injection assembly 7 includes an inlet pipe 701, on which a first flow meter 702 and a control valve 703 are installed. The inlet pipe 701 is connected to or connected to at least one medium water pipe 3, which is adjacent to the water injection pipe 106. The connection between the inlet pipe 701 and the medium water pipe 3 is selected based on the depth to which the bag sealer 1 penetrates the borehole. Both the water injection pipe 106 and the medium water pipe 3 are made of galvanized pipe. The control valve 703 is either a solenoid valve or a manually controlled ball valve, selected and configured according to usage requirements. The inlet pipe 701 is connected to a water source, which is a water pump located in a water tank or reservoir. Both ends of the medium water pipe 3 are provided with external threads, and quick-connect fittings are connected to the medium water pipe 3 via these threads. The threaded connection method makes disassembly and assembly more convenient and quick, facilitating rapid crack measurement and improving efficiency.

[0025] The expansion medium injection assembly 6 includes a medium input pipe 601, on which a second flow meter 602 and a valve switch 603 are installed. The medium input pipe 601 is connected to the adjacent medium slurry pipe 2. The medium input pipe 601 is connected to a medium source. The medium source is a grouting pump, which is directly connected to the raw material of the expansion medium and pumps it into the medium input pipe 601. The medium transmission pipe 601 is made of aluminum-plastic composite. A suitable length of medium input pipe 601 can be selected according to actual usage requirements. The valve switch 603 is either a solenoid valve or a manual mechanical ball valve. The appropriate type of valve switch 603 is selected according to actual usage requirements. The medium input pipe 601 is connected to the adjacent medium slurry pipe 2.

[0026] The working process and principle of the above structure are as follows: This borehole is drilled from bottom to top in the coal seam rock. During use, the water injection pipe 106 and grouting pipe 105 on the bag sealer 1 are first connected to the medium water pipe 3 and the medium grout pipe 2, respectively. A quick-connect water injection connector allows for rapid connection between the water injection pipe 106 and the medium water pipe 3. The medium water pipe 3 acts as a pusher, pushing the bag sealer 1 upwards to the position to be measured in the borehole. A quick-connect medium connector allows for rapid connection between the grouting pipe 105 and the medium grout pipe 2, improving overall installation efficiency. The pressure control valve 5 on the medium grout pipe 2 and the grouting pipe 105 is connected, and a remote control three-way valve 4 is connected between the water injection pipe 106 and the medium water pipe 3. The water injection pipe 106 of the bag sealer 1 located below is connected to the inlet pipe 701, the grouting pipe 105 is connected to the medium input pipe 601, and the grouting pump of the medium source is connected to the medium input pipe 601. The expanding medium sealing material is transmitted through the grouting pipe 105 and the medium grouting pipe 2 to the bladder sealer 1 closest to the closed end of the borehole. This causes the bladder sealer 1 to expand and bear pressure, sealing the borehole. After grouting continues and reaches the set pressure, the pressure control valve 5 on the grouting pipe 105 inside the bladder sealer 1 below it opens, injecting the sealing material into the bladder sealer 1. This causes the bladder sealer 1 to expand and bear pressure, abutting against the inner wall of the borehole. Since the preset calibrated pressures of the pressure control valves 5 inside the bladder sealers 1 arranged from the inside to the outside along the borehole length direction increase sequentially, the pressure control valves 5 inside the bladder sealers 1 arranged from the inside to the outside open sequentially, causing the corresponding bladder sealers 1 to expand and be grouted in sequence. (Second flow rate...) The flow meter 602 can monitor the grouting flow rate. Based on the expected grouting volume and the flow rate changes monitored by the second flow meter 602, it can determine whether the preset grouting volume threshold has been reached. When the flow rate drops below 20% of the initial value, and the grouting volume stabilizes at the preset threshold, the grouting is confirmed to be complete. The friction ring 103 directly contacts the borehole wall and embeds itself into the borehole wall under the action of expansion pressure, increasing the pressure-bearing capacity and friction resistance of the bag sealer 1. An elastic sealing ring 104 is provided between adjacent friction rings 103. The elastic sealing ring 104 is set on the outer surface of the bag sealer 1. The setting of the elastic sealing ring 104 further enhances the sealing effect between the bag sealer 1 and the borehole wall, preventing water leakage. The spacing between adjacent bag sealers 1 is determined according to the theoretically calculated spacing. If the spacing between the two sections is large, the medium grout pipe 2 and the medium water pipe 3 can be added according to the actual situation. The sealing process ends after the bag sealer 1 in the collapse zone and fracture zone bears pressure. When using other recyclable expansion media, the pressure inside the bladder 1 can be depressurized and contracted after use for the next use.

[0027] Open the control valve 703 of the inlet pipe 701 to supply water flow into the coal seam borehole. First, water is injected into the borehole sealing section area between adjacent bag sealers 1 through the injection pipe 106 and the remote control three-way valve 4. The first flow meter 702 records the injection volume. Based on the difference between the theoretical injection volume and the actual injection volume, the fracture condition is determined. When the first flow meter 702 detects that the flow rate drops to below 20% of the initial value, and the pressure sensor detects that the pressure stabilizes at a preset threshold, it is determined that the fracture has been saturated with water. The first flow meter 702 records the water injection volume. Based on the difference between the theoretical and actual water injection volume, the fracture condition of the borehole sealing section between the bag sealers 1 is determined. After adjusting the remote control three-way valve 4, the water flow is transmitted to other borehole sealing sections through the medium water pipe 3, and water injection measurement is performed through the remote control three-way valve 4 of the borehole sealing section. The fracture condition in the borehole is measured segment by segment in turn. A sealed environment is formed between the rock above the borehole and the bag sealer 1. Water is injected into the borehole sealing section through the water injection pipe 106, which can also achieve measurement. This device can measure borehole fractures by injecting water between adjacent bag sealers 1. The theoretical water injection volume between adjacent bag sealers 1 can be calculated based on the distance between them and the diameter of the borehole, realizing multi-segment synchronous measurement of borehole fractures. At the same time, it can also measure fractures by injecting water between the bag sealer 1 and the borehole sealing end, solving the problem that fractures at the borehole sealing end cannot be measured. The theoretical water injection volume between the bag sealer 1 and the borehole sealing end can be calculated based on the distance between the top rock of the borehole and the upper part of the bag sealer 1, as well as the diameter of the borehole. This enables multi-segment water injection measurement and simultaneous measurement of borehole fractures at multiple intervals, eliminating the need for repeated operations and improving measurement efficiency.

[0028] In another embodiment of this application, such as Figures 2-4 As shown, the difference between this embodiment and other embodiments is that multiple medium water pipes 3 are provided. Multiple medium water pipes 3 located between the water injection pipes 106 of adjacent bag sealers 1 are connected sequentially. Several medium water pipes 3 are connected between the water inlet pipe 701 and the corresponding water injection pipe 106. Quick-connect water injection connectors are connected between adjacent medium water pipes 3. With this configuration, different numbers of medium water pipes 3 can be selected and connected sequentially according to the actual measured drilling depth, and used as push rods to sequentially transport multiple bag sealers 1 to the designated position. The working process and principle of the above structure are as follows: In use, first connect the water injection pipe 106 and grouting pipe 105 on the bag sealing device 1 to the medium water pipe 3 and medium grout pipe 2 respectively. The water injection quick connector can quickly connect the water injection pipe 106 and the medium water pipe 3 together. According to the pushing height of the bag sealing device 1, select multiple medium water pipes 3 and connect them together in sequence to increase the length. The medium water pipe 3 can act as a pushing rod to push the bag sealing device 1 upward to the position to be measured in the borehole. The medium quick connector can quickly connect the grouting pipe 105 and the medium grout pipe 2, which improves the overall installation efficiency. And according to the actual position requirements, the medium water pipe 3 can be connected between the water inlet pipe 701 and the water injection pipe 106.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions 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 any suitable manner in one or more embodiments or examples.

[0034] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-stage water injection and sealing device for measuring fractures in mine rock strata, placed inside a borehole sealed at one end of the mine rock strata, characterized in that, include: N bag-shaped sealing devices are arranged along the length of the borehole. Each bag-shaped sealing device is equipped with a grouting pipe and a water injection pipe. The grouting pipe and the water injection pipe of two adjacent bag-shaped sealing devices are connected through a medium grout pipe and a medium water pipe, respectively. N is a positive integer. The grouting pipe is used to inject expansion medium into the bag sealer. Multiple bag sealers are injected with expansion medium sequentially from the inside to the outside along the length of the borehole to expand and seal the borehole. The water injection pipe is used to inject water into the end of the corresponding bag sealer near the sealed end of the borehole to perform segmented synchronous measurement of rock fractures.

2. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 1, characterized in that, Both ends of the water injection pipe are located outside the bladder sealing device. A remote-controlled three-way valve is connected between the water injection pipes of two adjacent bladder sealing devices to inject water into the corresponding borehole sealing section.

3. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 2, characterized in that, The remote control three-way valve is connected between the medium water pipe and one of the water injection pipes. Both the medium water pipe and the water injection pipe have a groove for placing wires along their length. The water injection pipe is sealed to its corresponding bladder sealer. A control line for connecting the remote control three-way valve is provided in the groove for transmitting control signals for opening and closing the remote control three-way valve.

4. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 1, characterized in that, Except for the bladder sealer located at the innermost side of the borehole, pressure control valves are provided on the grouting pipes of the remaining N-1 bladder sealers, and the preset calibrated pressure of the pressure control valves provided in the bladder sealers gradually increases from the inside to the outside along the length of the borehole.

5. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 4, characterized in that, One end of the grouting pipe is located inside the bladder sealing device, and the other end is located outside the bladder sealing device. The pressure control valve is installed inside the corresponding bladder sealing device. One end of the pressure control valve is connected to the end of the grouting pipe located inside the bladder sealing device, and the other end of the pressure control valve is connected to the medium grout pipe.

6. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 1, characterized in that, The grouting pipe of the bag sealer located on the outermost side of the borehole is connected to an expansion medium injection assembly, and the water injection pipe of the bag sealer is connected to a water injection assembly.

7. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 6, characterized in that, The water injection assembly includes a water inlet pipe, on which a first flow meter and a control valve are installed; the water inlet pipe is connected to or connected to at least one medium water pipe adjacent to the water injection pipe.

8. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 6, characterized in that, The expansion medium injection assembly includes a medium input pipe, on which a second flow meter and a valve switch are installed, and the medium input pipe is connected to the adjacent medium slurry pipe.

9. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 1, characterized in that, The bag sealing device includes an elastic bag body, with sealing caps at both ends of the elastic bag body. The water injection pipe and the grout injection pipe both pass through the sealing caps and are sealed to the sealing caps.

10. The multi-stage water injection sealing device for measuring rock strata fractures in mines according to claim 9, characterized in that, The outer surface of the elastic bladder is provided with several elastic friction rings, the cross-section of which is triangular; an elastic sealing ring is provided between adjacent friction rings, the elastic sealing ring being disposed on the outer surface of the elastic bladder.

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