Bag type water pressure test device

Abstract

A bag type water pressure test device is characterized in that an inner bag and an outer bag are sequentially arranged from inside to outside along a drill hole, a gap is reserved between the inner bag and the outer bag, fixed sealing joints are mounted at two ends of the inner bag and the outer bag, and the sealing joint, close to the outer side of the drill hole, of the outer bag is connected with a high-pressure water inlet pipe and a section of steel pipe; the other end of the high-pressure water inlet pipe is connected with the pump body; one end of the steel pipe is connected with the first liquid injection pipe, the other end of the steel pipe is connected with the pump body through the high-pressure hose, and the other ends of the first liquid injection pipe and the second liquid injection pipe penetrate through the outer bag and extend into the inner bag; first liquid outlets are uniformly distributed in the first liquid injection pipe between the inner and outer side bags, second liquid outlets are formed in the first liquid injection pipe in the inner and outer side bags, and third liquid outlets are formed in the second liquid injection pipe in the inner side bag; and water swelling materials are filled in the inner and outer side bags. Through the arrangement of the inner bag and the outer bag and the communication of the high-pressure water pipe, efficient hole sealing can be achieved.

Description

Technical Field

[0001] The utility model relates to a bag type water pressure testing device, belonging to the technical field of underground hole sealing in coal mines. Background Art

[0002] Sealing holes in underground coal mines is one of the important measures taken during coal mining to prevent harmful gases or liquids such as gas and water from spreading along the holes to the underground working face and to ensure the safety of the mine. Sealing hole technology plays a vital role in coal mine production safety. It can effectively prevent the spread of harmful gases, reduce the occurrence of accidents such as gas explosions and water inrush, and thus protect the lives and property of miners.

[0003] With the increase in the depth of coal mining and the complexity of mine structures, traditional sealing methods and equipment have gradually exposed some shortcomings in practical applications. For example, the sealing equipment currently widely used is mostly "canvas" material. This material needs to be reduced in volume by "folding and bundling" during use, and then sent to the predetermined position in the hole for grouting and filling to achieve the purpose of sealing the borehole. However, due to the irregular shape of the hole wall or late deformation, the sealing on both sides of the drilling grouting section is not tight, which often causes leakage of the grouting sealing liquid in the middle section, and then leads to the failure of drilling sealing. This phenomenon of lax sealing not only affects the sealing effect, but may also cause safety accidents and endanger the lives of miners. In addition, the durability of canvas materials in the harsh environment underground is poor and they are easily damaged, further affecting the sealing effect.

[0004] Another problem with traditional sealing technology is that it is complicated to operate and inefficient. The sealing process requires a lot of manpower and time, and the sealing effect is greatly affected by human operation, making it difficult to ensure the uniformity and stability of the sealing. With the complexity of mine structures and the increase in mining depth, the uncertainties in the sealing process are also increasing. Traditional methods are difficult to cope with these changes, making it difficult to improve the efficiency and safety of sealing operations. In addition, the design and manufacturing materials of existing sealing equipment also have certain limitations. Under high pressure conditions, traditional sealing equipment is prone to rupture or leakage and cannot adapt to the complex working environment underground. In order to improve the sealing effect, the sealing equipment must be improved so that it can remain stable and reliable in complex environments such as high pressure and high temperature. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a bag-type water pressure testing device, which has a simple structure and is easy to assemble. Through the arrangement of inner and outer bags and the connection of high-pressure water pipes, efficient sealing can be achieved.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a bag-type water pressure test device, comprising an inner bag and an outer bag, which are arranged in sequence from the inside to the outside along the arranged borehole, with a spacing between the inner bag and the outer bag, fixed sealing joints are installed at both ends of the inner bag and the outer bag, and the sealing joint of the outer bag close to the outside of the borehole is respectively connected to a high-pressure water inlet pipe and a section of steel pipe through a fixing cap, one end of the high-pressure water inlet pipe is connected to a second injection pipe, and the other end of the high-pressure water inlet pipe is connected to a pump body. One end of the steel pipe is connected to the first liquid injection pipe, and the other end of the steel pipe is connected to the pump body through a high-pressure hose. The other ends of the first liquid injection pipe and the second liquid injection pipe both penetrate the outer bladder bag and extend to the inside of the inner bladder bag; the first liquid outlet is evenly distributed on the first liquid injection pipe located between the outer bladder bag and the inner bladder bag, the second liquid outlet is arranged on the first liquid injection pipe located inside the outer bladder bag and the inner bladder bag, and the third liquid outlet is arranged on the second liquid injection pipe located inside the inner bladder bag; the inner bladder bag and the outer bladder bag are both filled with water-swellable material.

[0007] Furthermore, the inner bag and the outer bag of the utility model are both woven bags, that is, the outer bag and the inner bag are usually made of high-strength woven materials, have good tensile strength and wear resistance, and can remain stable for a long time in the complex environment underground.

[0008] Furthermore, the utility model provides an injection pipe control valve on the high-pressure hose connected to the first injection pipe, and a bag injection pipe control valve on the high-pressure water inlet pipe connected to the second injection pipe, and pressure gauges are provided on the first injection pipe and the second injection pipe. These components are used to monitor and control the pressure during the injection process to ensure the stability and safety of the sealing process. By accurately controlling the injection pressure, equipment damage caused by excessive pressure can be avoided, and at the same time, the sealing material can be ensured to fully fill the hole, thereby improving the sealing effect.

[0009] Furthermore, the parts of the first injection tube and the second injection tube of the utility model located between the inner bag and the outer bag are fixed by a sealing joint located in the middle of the drilled hole of the inner bag and the outer bag.

[0010] Furthermore, the high-pressure water inlet pipe and high-pressure water pipe of the utility model are made of high-pressure and corrosion-resistant materials; the first injection pipe and the second injection pipe are both made of steel pipes, which can ensure that no rupture or leakage occurs under high-pressure conditions, thereby improving the reliability and service life of the device. The selection and application of high-pressure resistant materials enable the device to remain stable and safe under the impact of high-pressure water flow, adapt to the complex working environment underground, and further improve the safety and efficiency of the sealing operation.

[0011] Compared with the prior art, the utility model utilizes the inner bag and the outer bag structure, and connects the inner bag and the outer bag through the first injection tube and the second injection tube. The inner bag and the outer bag are filled with water-swelling materials. The water-swelling materials can quickly expand and fill the holes after water injection, ensuring the tightness and durability of the sealing holes. The utility model can effectively improve the sealing efficiency and sealing effect, and avoid the problem of loose sealing of traditional sealing equipment. The utility model can not only adapt to various complex mine environments, but also adjust the positions of the injection ports on the first injection tube and the second injection tube according to actual needs, ensuring that the sealing material can be evenly distributed in the holes of the drilled hole, and improving the density and reliability of the sealing hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the front view of the utility model;

[0013] Figure 2 This is a schematic diagram of the use state of the utility model;

[0014] Figure 3 for Figure 1 The enlarged view of point A in the middle;

[0015] Figure 4 for Figure 2 An enlarged view of point B.

[0016] Figure numerals: 1. drilling hole, 2. outer bladder bag, 3. inner bladder bag, 4. pump body, 5. first liquid injection tube, 6. second liquid injection tube, 7. first liquid outlet, 8. second liquid outlet, 9. third liquid outlet, 10. liquid injection tube control valve, 11. bladder liquid injection tube control valve, 12. pressure gauge, 13. water-swellable material. DETAILED DESCRIPTION

[0017] The utility model will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 1-Figure 4As shown, a bag-type water pressure test device comprises an inner bag 3 and an outer bag 2, which are arranged in sequence from the inside to the outside along the arranged borehole 1, with a spacing left between the inner bag 3 and the outer bag 2, and fixed sealing joints are installed at both ends of the inner bag 3 and the outer bag 2, and the sealing joint of the outer bag 2 close to the outside of the borehole 1 is respectively connected to a high-pressure water inlet pipe and a section of steel pipe through a fixing cap, one end of the high-pressure water inlet pipe is connected to a second injection pipe 6, and the other end of the high-pressure water inlet pipe is connected to a pump body 4, one end of the steel pipe is connected to a first injection pipe 5, and the other end of the steel pipe is connected to the pump body 4 through a high-pressure hose, and the other ends of the first injection pipe 5 and the second injection pipe 6 are both arranged through the outer bag 2 and extend to the inside of the inner bag 3; an injection pipe is arranged on the high-pressure hose connected to the first injection pipe 5. A pipe control valve 10 is arranged on the high-pressure water inlet pipe connected to the second injection pipe 6, a bag injection pipe control valve 11 is arranged on the first injection pipe 5 and the second injection pipe 6, and a pressure gauge 12 is arranged on the first injection pipe 5 and the second injection pipe 6; a first liquid outlet 7 is evenly distributed on the first injection pipe 5 located between the outer bag 2 and the inner bag 3, a second liquid outlet 8 is arranged on the first injection pipe 5 located inside the outer bag 2 and the inner bag 3, and a third liquid outlet 9 is arranged on the second injection pipe 6 located inside the inner bag 3; the high-pressure water inlet pipe, the high-pressure water pipe, the first injection pipe 5 and the second injection pipe 6 are all made of high-pressure resistant and corrosion-resistant materials; the inner bag 3 and the outer bag 2 are both woven bags, and the inner bag 3 and the outer bag 2 are both filled with water-swellable materials 13.

[0019] The first injection tube 5 and the second injection tube 6 are located between the inner bladder bag 3 and the outer bladder bag 2 and are fixed by a sealing joint between the inner bladder bag 3 and the outer bladder bag 2 located in the middle of the drilled hole.

[0020] The main structure of the bag-type water pressure test device of the utility model includes an outer bag 2, an inner bag 3 and a pump body 4. Through a series of designs and optimizations, these components enable the device to effectively block the underground borehole 1 during operation, prevent the diffusion of harmful substances such as gas and water, and ensure the safety of the mine.

[0021] Borehole 1: Borehole 1 is the main channel for the device to be inserted. The design of borehole 1 needs to be adjusted according to the actual situation of the mine to ensure that the device can be smoothly inserted and work effectively. The diameter and depth of borehole 1 need to be designed according to the actual needs of the mine to ensure that sufficient space and support can be provided so that the outer bladder 2 and the inner bladder 3 can be fully deployed and function.

[0022] Outer bladder bag 2 and inner bladder bag 3: Outer bladder bag 2 and inner bladder bag 3 are the core components of the device. Outer bladder bag 2 and inner bladder bag 3 are arranged from inside to outside along the arranged borehole 1. Outer bladder bag 2 and inner bladder bag 3 are filled with water-swellable material 13. This material can expand rapidly after contacting water, fill the borehole hole and form a tight seal. A first injection tube 5 and a second injection tube 6 are provided between the outer bladder bag 2 and the inner bladder bag 3. Liquid can be injected into the outer bladder bag 2 and the inner bladder bag 3 through the first injection tube 5 and the second injection tube 6. The outer bladder bag 2 and the inner bladder bag 3 are usually made of high-strength woven materials, have good tensile strength and wear resistance, and can remain stable for a long time in the complex environment underground.

[0023] The first injection tube 5 and the second injection tube 6: The first injection tube 5 and the second injection tube 6 are important channels for injecting liquid into the bladder. The first injection tube 5 is provided with a first liquid outlet 7 located between the outer bladder 2 and the inner bladder 3, and a second liquid outlet 8 located in the inner and outer bladders. These liquid outlets ensure that the liquid can be evenly distributed in the outer bladder 2 and the inner bladder 3, promoting the uniform expansion of the water-swellable material 13; the second injection tube 6 is provided with a third liquid outlet 9 located in the inner bladder 3, further ensuring that the liquid can fully penetrate into every corner of the inner bladder 3; the material of the first injection tube 5 and the second injection tube 6 is usually selected from steel pipe materials to ensure that it can be used for a long time under high pressure conditions without rupture or leakage. The utility model can use two pipes to inject liquid at the same time by setting the first injection tube 5 and the second injection tube 6, or can control whether to inject the first injection tube or the second injection tube first according to the drilling requirements. It is also a safety measure. When one of the pipes is blocked, another pipe can be selected for injection operation, which will not delay the sealing progress.

[0024] Pump body 4: The pump body 4 is the power source of the first injection pipe 5 and the second injection pipe 6. The liquid can be efficiently injected into the outer bag 2 and the inner bag 3 along the high-pressure water inlet pipe and the high-pressure hose through the pump body 4; the pump body 4 is provided with an injection pipe control valve 10 that cooperates with the first injection pipe 5 and a bag injection pipe control valve 11 that cooperates with the second injection pipe 6. The injection pipe control valve 10 can control the flow rate of the liquid flowing into the first injection pipe 5 to ensure the stability and efficiency of the injection process; the bag injection pipe control valve 11 is connected to the second injection pipe 6, and the second injection pipe 6 is provided with a third liquid outlet 9 on the inner bag, which can control the injection flow rate of the inner bag 3; the pump body 4 usually adopts a high-efficiency and low-noise design to ensure stable operation during the injection process while reducing interference with the underground working environment.

[0025] Pressure gauge 12: Pressure gauge 12 is provided on both the first injection pipe 5 and the second injection pipe 6. Pressure gauge 12 is used to monitor the pressure of the liquid during the injection process. Through pressure gauge 12, the injection status of the liquid can be understood in real time, and the injection speed and pressure can be adjusted in time to ensure the optimization of the sealing effect. The design of pressure gauge 12 should have high precision and durability, and be able to provide accurate and reliable pressure readings in a high-pressure environment.

[0026] Water-swellable material 13: The water-swellable material 13 filled in the outer bladder 2 and the inner bladder 3 can react and expand quickly after contacting water, filling the drilled hole and forming a tight seal. This material has excellent expansion performance and adhesion, which can ensure the tightness and durability of the seal. The water-swellable material is usually made of environmentally friendly polymer materials, which will not pollute the underground environment and have a long service life.

[0027] In actual use, insert the bag-type water pressure test device into the drilled hole that needs to be blocked. The specific steps are as follows:

[0028] 1. Preparation and insertion of the device: Place the device at the entrance of the drilled hole, ensure that the device is in the correct direction and position, and then slowly insert the device into the hole with appropriate thrust until the device is completely inside the drilled hole. Ensure that the outer pouch 2 and the inner pouch 3 are in the predetermined position of the hole. During the insertion process, care should be taken to keep the device stable to avoid the device getting stuck on the hole wall due to tilting or other reasons.

[0029] 2. Liquid injection operation: Connect the pump body 4 with the first liquid injection tube 5 and the second liquid injection tube 6, and inject the liquid into the outer bladder bag 2 and the inner bladder bag 3 through the pump body 4. The liquid is discharged through the first liquid outlet 7, the second liquid outlet 8 and the third liquid outlet 9 respectively, and is evenly distributed in the outer bladder bag 2 and the inner bladder bag 3. During the liquid injection process, it is necessary to continuously monitor the reading on the pressure gauge 12 to ensure that the liquid injection pressure is within a reasonable range to prevent excessive pressure from causing damage to the equipment. At the same time, it is necessary to ensure that the speed and amount of liquid injection are consistent with the design requirements to ensure the sealing effect.

[0030] 3. Expansion and blocking: The water-swellable material 13 in the outer bladder 2 and the inner bladder 3 reacts quickly with the liquid and expands. After expansion, the outer bladder 2 and the inner bladder 3 are tightly attached to the borehole wall to form a tight blocking layer. With the continuous injection of liquid, the swelling material will further expand and solidify to ensure the blocking effect. During the expansion process, it is necessary to closely monitor the flow of the liquid and the pressure change to ensure that the entire blocking process proceeds smoothly.

[0031] 4. Monitoring and adjustment: During the entire injection and expansion process, the operator needs to constantly monitor the reading of the pressure gauge 12 and the flow of the liquid, and adjust the injection pipe control valve 10 and the bag injection pipe control valve 11 according to actual needs to ensure the stability and efficiency of the sealing process. At the same time, the operator should adjust the injection volume and injection speed in time according to the on-site conditions to avoid excessive expansion or incomplete sealing.

[0032] 5. Complete the plugging: When the outer bladder 2 and the inner bladder 3 are fully expanded and solidified, stop the injection operation, close the control valve, and disconnect the pump body 4 from the injection tube. At this point, the device has completed the plugging operation of the hole and ensured the sealing effect of the hole. After the plugging is completed, the plugging effect needs to be checked to ensure that there is no water leakage or gas leakage. If necessary, a second injection or other supplementary operation can be performed to ensure that the plugging effect is fully up to standard.

[0033] The following is a detailed embodiment in actual application, which demonstrates the actual operation steps and effects of the utility model in mine hole sealing.

[0034] In a mine, a borehole with a depth of 10 meters and a diameter of 30 centimeters needs to be sealed. The operation steps are as follows:

[0035] 1. Preparation

[0036] First, prepare all the components of the utility model, including the borehole 1, the outer bladder 2, the inner bladder 3, the pump body 4, the first injection tube 5, the second injection tube 6, the pressure gauge 12 and all the tools and equipment required for the connection. At the same time, ensure sufficient water-swellable materials 13 and water sources for injection. In order to ensure the smooth operation, it is also necessary to prepare necessary safety equipment and monitoring equipment to enable real-time monitoring and adjustment during the plugging process. Before officially starting the operation, conduct a detailed inspection and cleaning of the borehole 1 to ensure that there is no debris blocking the inside of the borehole 1 and that the hole wall is smooth and has no obvious defects. This step is very important because debris and defects in the hole may affect the expansion and plugging effect of the bladder. Use professional drilling inspection equipment for inspection to ensure that the structure of the borehole 1 meets the requirements.

[0037] 2. Device Preparation and Insertion

[0038] All components of the utility model are preassembled on the ground. First, the outer bladder 2 and the inner bladder 3 are correctly connected to the entrance of the borehole 1 to ensure that the outer bladder 2 and the inner bladder 3 can be smoothly unfolded and expanded. Then, the first injection tube 5 and the second injection tube 6 are respectively connected to the outer bladder 2 and the inner bladder 3 to ensure that the connection between the first injection tube 5 and the second injection tube 6 is tight and leak-free. The preassembled device is placed at the entrance of the borehole 1 to ensure that the direction and position of the device are correct. Then, the utility model is slowly inserted into the borehole with appropriate thrust until the utility model completely enters the borehole 1. The device needs to be kept stable during the insertion process to avoid the device from tilting or getting stuck on the wall of the hole. After the insertion is completed, ensure that the outer bladder 2 and the inner bladder 3 are in the predetermined position of the borehole 1. In order to ensure that the device enters the borehole smoothly, a guide device can be set at the entrance of the borehole to help the device align with the hole. The guide device can be made of wear-resistant material and designed to be conical or circular to reduce friction and resistance during the insertion process.

[0039] 3. Connect the pump and start the injection operation

[0040] The pump body 4 is connected to the corresponding first injection pipe 5 and second injection pipe 6 through a high-pressure hose and a high-pressure water inlet pipe, and after the connection is completed, all connection points are checked to ensure that there is no leakage or looseness. The pump body 4 is started to start the injection operation.

[0041] After the pump body 4 is started, the liquid is injected into the outer bladder bag 2 and the inner bladder bag 3 through the first injection tube 5 and the second injection tube 6. The liquid is discharged through the first liquid outlet 7, the second liquid outlet 8 and the third liquid outlet 9, and is evenly distributed in the outer bladder bag 2 and the inner bladder bag 3. During the injection process, it is necessary to continuously monitor the reading on the pressure gauge 12 to ensure that the injection pressure is within a reasonable range to prevent excessive pressure from causing damage to the equipment.

[0042] According to the on-site conditions, gradually increase the injection pressure and speed. At the beginning, the injection speed should be slow, and gradually observe the expansion of the outer bag 2 and the inner bag 3 and the stress on the hole wall. If the outer bag 2 and the inner bag 3 expand evenly and fit tightly against the hole wall, the injection speed and pressure can be appropriately increased.

[0043] 4. Capsular expansion and occlusion

[0044] The water-swellable material 13 in the outer bladder 2 and the inner bladder 3 reacts quickly with the liquid and expands. After the outer bladder 2 and the inner bladder 3 expand, they adhere closely to the wall of the drill hole to form a tight plugging layer. As the liquid is continuously injected, the swelling material will further expand and solidify to ensure the plugging effect. During the expansion process, it is necessary to closely monitor the flow of the liquid and the pressure change to ensure that the entire plugging process proceeds smoothly.

[0045] The operator should adjust the injection pipe control valve 10 and the bag injection pipe control valve 11 in time according to the reading of the pressure gauge 12 and the flow of the liquid to ensure the stability and efficiency of the sealing process. For deep or large boreholes, injection and expansion can be carried out in stages to ensure the stability of the sealing effect of each section.

[0046] During the entire expansion process, the operator needs to regularly check the expansion of the outer bladder bag 2 and the inner bladder bag 3 and the stress on the hole wall. Use professional testing equipment to monitor the expanded outer bladder bag 2 and the inner bladder bag 3 to ensure that the outer bladder bag 2 and the inner bladder bag 3 are tightly attached to the hole wall without obvious gaps and water leakage.

[0047] 5. Complete occlusion and follow-up inspection

[0048] When the outer bladder 2 and the inner bladder 3 are fully expanded and solidified, stop the injection operation, close the control valve, and disconnect the pump body 4 from the injection tube. At this point, the device has completed the plugging operation of the hole, ensuring the sealing effect of the hole. After the plugging is completed, a comprehensive inspection and test is carried out. Use special detection equipment to check the blocked holes to ensure that the holes are completely blocked and there is no water leakage or gas leakage. If the blocking effect is found to be unsatisfactory, a secondary injection or other supplementary operation is required to ensure that the blocking effect is fully up to standard. After the blocking effect is confirmed to be correct, all equipment and materials are sorted and recorded. Record data such as materials used in the blocking process, injection volume, injection pressure and blocking time to provide a reference for subsequent operations and analysis.

[0049] 6. Precautions and safety precautions

[0050] During the entire operation process, the safety operating procedures must be strictly followed to ensure the safety of the operators. Operators should wear necessary safety protection equipment, such as safety helmets, safety shoes, gloves and protective glasses. During the injection and expansion process, operators should remain vigilant and observe the pressure gauge and liquid flow at any time to avoid safety accidents caused by equipment failure or operating errors.

[0051] In addition, during the injection and expansion process, operators should avoid being close to the high-pressure liquid injection point to prevent accidental injuries caused by high-pressure liquid injection. Operators should monitor and operate at a safe distance to ensure safety.

[0052] During the blocking process, you should keep in touch with the mine management department and other relevant personnel at all times, and promptly report the blocking progress and equipment status to ensure that the blocking operation is coordinated with other mine operations to avoid safety hazards caused by information asymmetry.

[0053] Through the above detailed implementation steps and precautions, the utility model has demonstrated its excellent plugging effect and convenient operation in actual operation. In the process of sealing the mine hole, the device can effectively block the drilled holes in various complex environments, prevent the spread of harmful substances such as gas and water, and ensure the safe production of the mine.

[0054] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A bag-type water pressure test device, comprising an inner bag (3) and an outer bag (2), characterized in that: The inner bag (3) and the outer bag (2) are arranged in sequence from the inside to the outside along the arranged borehole (1), with a spacing between the inner bag (3) and the outer bag (2), both ends of the inner bag (3) and the outer bag (2) are installed with fixed sealing joints, the sealing joint of the outer bag (2) close to the outside of the borehole (1) is connected to a high-pressure water inlet pipe and a section of steel pipe through a fixing cap, one end of the high-pressure water inlet pipe is connected to a second injection pipe (6), the other end of the high-pressure water inlet pipe is connected to a pump body (4), one end of the steel pipe is connected to a first injection pipe (5), and the other end of the steel pipe is connected to the pump body ( 4), the other ends of the first injection tube (5) and the second injection tube (6) are both inserted through the outer bladder bag (2) and extend to the interior of the inner bladder bag (3); a first liquid outlet (7) is evenly distributed on the first injection tube (5) located between the outer bladder bag (2) and the inner bladder bag (3), a second liquid outlet (8) is arranged on the first injection tube (5) located inside the outer bladder bag (2) and the inner bladder bag (3), and a third liquid outlet (9) is arranged on the second injection tube (6) located inside the inner bladder bag (3); and the inner bladder bag (3) and the outer bladder bag (2) are both filled with water-swellable material (13).

2. A bag type water pressure test device according to claim 1, characterized in that: The inner bladder bag (3) and the outer bladder bag (2) are both woven bags.

3. A bag type water pressure test device according to claim 2, characterized in that: A liquid injection pipe control valve (10) is provided on a high-pressure hose connected to the first liquid injection pipe (5), a bag liquid injection pipe control valve (11) is provided on a high-pressure water inlet pipe connected to the second liquid injection pipe (6), and pressure gauges (12) are provided on both the first liquid injection pipe (5) and the second liquid injection pipe (6).

4. A bag type water pressure test device according to claim 2, characterized in that: The first injection tube (5) and the second injection tube (6) are located between the inner bladder bag (3) and the outer bladder bag (2), and are fixed by a sealing joint located in the middle of the drilled hole of the inner bladder bag (3) and the outer bladder bag (2).

5. A bag type water pressure test device according to claim 3, characterized in that: The high-pressure water inlet pipe and the high-pressure water pipe are made of high-pressure resistant and corrosion-resistant materials; the first liquid injection pipe (5) and the second liquid injection pipe (6) are both made of steel pipes.

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