Device and method for treating effluent between walls of high-pressure-bearing double-layer sleeve

Abstract

The invention discloses a high-pressure-bearing double-layer sleeve inter-wall effluent disposal device and method. The high-pressure-bearing double-layer sleeve inter-wall effluent disposal device comprises a double-layer sleeve arranged at an opening of a long observation hole, the upper portion of the double-layer sleeve is connected with a conical sleeve, the upper end, with the larger hole diameter, of the conical sleeve is further connected with an external variable-diameter steel pipe through a flange, and the lower end, with the smaller hole diameter, of the conical sleeve is connected with the double-layer sleeve; the upper end of the external reducing steel pipe is connected with a water pipe through an internal thread steel pipe; a gate valve and a pressure gauge are arranged on the internal thread steel pipe, and the pressure gauge is arranged close to one end of the external reducing steel pipe. The problem of water outflow between casing walls is solved, the hydrological observation function of a long observation hole is reserved, and water can be drained through the gate valve for underground use; large equipment and special materials are not needed in the treatment process, the treatment cost is low, electric welding and other processes are not used, and the operation risk is small.

Description

Technical Field

[0001] The present invention belongs to the technical field of the treatment method for water leakage from the coal mine pipe wall, and specifically relates to a device for treating water leakage between the walls of a high-pressure-bearing double-layer casing; it also relates to a method for treating water leakage between the walls of a high-pressure-bearing double-layer casing. Background Art

[0002] An important part of the prevention and control work for the water hazard of the coal mine floor is to establish a hydro-dynamic observation network for the aquifer, and the observation network is mainly composed of long-term observation holes for the aquifer hydrology. Due to the relatively high risk of the high-pressure-bearing aquifer at the floor, in order to meet the needs of the preliminary pumping test of the aquifer and ensure the safety of the boreholes, the long-term observation holes for the aquifer hydrology mostly adopt a double-layer casing structure. However, since the pipe diameters of the two layers of casings are relatively close, the space between the casings is mainly sealed with cement slurry. When under the long-term action of high water pressure and the quality of the pipe fixing in the early stage is unreliable, water leakage between the casing walls is likely to occur. Since the orifice distances of the two layers of casings are relatively close and the space between the walls is limited, it is difficult to seal the interlayer water leakage by means of grouting into the space between the walls. Due to risks such as gas and dust explosions, welding and other methods cannot be used for treatment underground. Under the action of high water pressure, it is also difficult to achieve long-term effectiveness by wrapping and winding with other materials, and the high water pressure makes the water flow between the walls splash easily to the surrounding areas, which not only affects the production operations in the nearby areas but also poses potential water inrush hazards and threatens the safety of the mine. In the past, for such problems, the entire long-term observation hole for the aquifer hydrology was generally grouted and sealed directly by grouting. This method not only makes the long-term observation hole scrapped and loses its utilization value, but also, since the grouting is from the inner casing to the bottom of the hole, effective filling of the space between the walls cannot be achieved. Therefore, the problem of water seepage between the walls has not been completely solved, and there is still a possibility of water seepage. Therefore, an invention of a method for treating water leakage between the walls of a double-layer casing is needed to solve the problem that the water leakage between the hole walls affects underground production and safety on the premise of ensuring the availability of the long-term observation hole. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for treating water leakage between the walls of a high-pressure-bearing double-layer casing, which solves the problem that the water leakage between the hole walls affects underground production and safety.

[0004] The purpose of the present invention also lies in providing a method for treating water leakage between the walls of a high-pressure-bearing double-layer casing.

[0005] The technical solution adopted by the present invention is as follows: A device for treating water leakage between the walls of a high-pressure-bearing double-layer casing includes a double-layer casing arranged at the orifice of the long-term observation hole for the aquifer hydrology. A conical sleeve is connected to the upper part of the double-layer casing. The upper end of the conical sleeve with a larger aperture is also connected with an external reducing steel pipe through a flange, and the lower end with a smaller aperture is connected with the double-layer casing; the upper end of the external reducing steel pipe is connected with a water pipe through an internal-threaded steel pipe; a gate valve and a pressure gauge are arranged on the internal-threaded steel pipe, and the pressure gauge is arranged close to one end of the external reducing steel pipe.

[0006] The characteristics of the present invention also lie in that, The double-layer casing includes an outer casing and an inner casing. A flange is installed at the upper end of the inner casing. The upper end of the outer casing is lower than that of the inner casing. The gap formed between the upper parts of the outer casing and the inner casing is the water outlet.

[0007] The outer casing is provided with an orifice flange, and the inner casing is provided with an orifice flange plate. Among them, the inner diameter dimension of the flange at the orifice of the conical sleeve needs to be greater than the outer diameter dimensions of the orifice flange of the outer casing and the orifice flange plate of the inner casing.

[0008] The lower end of the externally connected reducing steel pipe with a larger aperture is welded with a flange, and the upper end with a smaller aperture is turned with an external thread. The upper end of the externally connected reducing steel pipe with a smaller aperture is threadedly connected to the internally threaded steel pipe.

[0009] The conical sleeve is composed of two symmetrical halves. At the connection of the two parts, a rib plate and fasteners are welded. After being connected by bolts, it becomes an integral body. The thickness of the conical sleeve is 3 - 6 mm.

[0010] A 2 - 5 mm thick water-stop rubber pad is padded around the outer wall of the outer casing. The conical sleeve is sleeved on the water-stop rubber pad and the corresponding fasteners are tightened with bolts.

[0011] The second technical solution adopted in the present invention is: a method for treating the water outlet between the walls of the high-pressure-bearing double-layer casing, which is specifically as follows: Step 1: Manufacture a conical sleeve, an externally connected reducing steel pipe, an internally threaded steel pipe, and make a rubber sleeve using a soft rubber tube; Step 2: Dig around the outer layer of the casing to meet the needs of personnel operation and installation of the conical sleeve in the excavated space outside the casing; close the gate valve on the water pipe; Step 3: Sleeve the rubber sleeve under the orifice flange of the outer casing and lock it with double-layer stirrups. The rubber sleeve includes the entire gate valve and pressure gauge including the water pipe. The other end of the rubber sleeve is tied to the water pipe with wire. Open the gate valve and discharge the water ejected from the hole wall through the water pipe; Step 4: Polish the rust on the outer wall of the outer casing with sandpaper or a file; under the double-layer stirrups, pad a 2 - 5 mm thick water-stop rubber pad around the outer wall of the outer casing. Sleeve the two half conical sleeves on the water-stop rubber pad, and at the same time, pad a 2 - 5 mm thick water-stop rubber pad on the docking surface of the two half conical sleeves, and then tighten the corresponding fasteners with bolts through the bolt holes; Step 5: Open the wire-tied rubber sleeve, move the rubber sleeve back to the position below the pressure gauge of the water pipe, and remove the pressure gauge and the gate valve; Step 6: Quickly connect the externally connected reducing steel pipe to the conical sleeve through the flange, and connect the other end to the internally threaded steel pipe through the orifice thread. Install a pressure gauge and a gate valve on the internally threaded steel pipe, and connect the gate valve to an external water pipe; Step 7: Close the gate valve, observe the water pressure value, compare it with the historical observation data to judge whether there is any abnormality, and then open the gate valve to drain water so that the area between the conical sleeve and the external reduced-diameter steel pipe is in a non-pressure state; Step 8: Excavate a space outside the casing to fix the circular formwork. The inner diameter of the circular formwork is 10 - 20 cm larger than the diameter of the excavated space outside the casing, and the upper part of the circular formwork is more than 20 cm higher than the bottom of the conical sleeve, so that the bottom of the conical sleeve is included in the circular formwork. Then pour impermeable cement in the circular formwork to consolidate the excavated space outside the bottom of the casing and the bottom of the conical sleeve together; Step 9: After the cement solidifies, remove the circular formwork, close the gate valve, and observe the water pressure of the aquifer through the pressure gauge.

[0012] The features of the present invention also lie in that, Step 1.1: Measure the outer diameter of the outer casing, the outer diameter of the flange at the outer casing opening, and the distance between the flange at the outer casing opening and the flange at the inner casing orifice; Step 1.2: Use steel plates to cut and weld to make the conical sleeve; Step 1.3: Use a soft rubber hose to make a rubber sleeve. The inner diameter of the rubber sleeve needs to be larger than the flange of the double-layer casing opening to make it easy to put on; Step 1.4: Use steel pipes to weld and make the external reduced-diameter steel pipe. A flange is welded at the larger-diameter end of the external reduced-diameter steel pipe, and the flange size is the same as that of the top flange of the conical sleeve. The smaller-diameter end is threaded to facilitate docking with the internal threaded steel pipe; Step 1.5: Make an internal threaded steel pipe with the same diameter as the smaller-diameter end of the external reduced-diameter steel pipe. Threads are cut at one end to facilitate connection with the external reduced-diameter steel pipe through threads. A flange is welded at the other end, and a position for installing a pressure gauge is reserved on the internal threaded steel pipe.

[0013] The beneficial effects of the present invention are as follows: Compared with the prior art, the present invention has the following technical effects: (1) The materials used have a wide range of sources, the component structure is simple, and it can be completed by self-processing with relatively low manufacturing difficulty.

[0014] (2) The operation process is simple, and it can be completed by general operators.

[0015] (3) It not only eliminates the problem of water leakage between the casing walls, retains the hydrographic observation function of the long-term observation hole, but also can supply water for underground use by draining water through the gate valve.

[0016] (4) Large-scale equipment and special materials are not required during the disposal process, the disposal cost is relatively low, processes such as electric welding are not used, and the operation risk is small. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the double-layer casing of the hydrographic long-term observation hole of the present invention; Figure 2 It is a schematic cross-sectional view of the conical sleeve structure of the present invention.

[0018] Figure 3 It is a step-by-step operation process diagram of the method for dealing with water leakage between the walls of the high-pressure-bearing double-layer casing of the present invention.

[0019] Figure 4 It is a step-by-step operation process diagram of the method for dealing with water leakage between the walls of the high-pressure-bearing double-layer casing of the present invention.

[0020] In the figure: 1 - ground; 2 - outer casing; 3 - inner casing; 4 - flange of the outer casing opening; 5 - water flow direction; 6 - flange plate; 7 - internally threaded steel pipe; 8 - pressure gauge; 9 - bolt; 10. gate valve; 11 - water pipe; 12 - excavation space outside the casing; 13 - rubber sleeve; 14 - double-layer stirrups; 15 - flange at the top of the conical sleeve; 16 - fastener; 17 - bolt hole; 18 - conical sleeve; 19 - externally connected reducing steel pipe; 20 - thread; 21 - circular formwork; 22 - cement; 23 - rib plate; 24 - iron wire. Specific embodiments

[0021] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Embodiment 1 The device for dealing with water leakage between the walls of the high-pressure-bearing double-layer casing of the present invention includes a double-layer casing arranged at the orifice of the long-term observation hole. The upper part of the double-layer casing is connected with a conical sleeve 18. The upper end of the conical sleeve 18 with a larger aperture is also connected with an externally connected reducing steel pipe 19 through a flange, and the lower end with a smaller aperture is connected with the double-layer casing; the upper end of the externally connected reducing steel pipe 19 is connected with a water pipe 11 through an internally threaded steel pipe 7; a gate valve 10 and a pressure gauge 8 are arranged on the internally threaded steel pipe 7, and the pressure gauge 8 is arranged near one end of the externally connected reducing steel pipe 19.

[0023] Embodiment 2 The device for dealing with water leakage between the walls of the high-pressure-bearing double-layer casing of the present invention includes a double-layer casing arranged at the orifice of the long-term observation hole. The upper part of the double-layer casing is connected with a conical sleeve 18. The upper end of the conical sleeve 18 with a larger aperture is also connected with an externally connected reducing steel pipe 19 through a flange, and the lower end with a smaller aperture is connected with the double-layer casing; the upper end of the externally connected reducing steel pipe 19 is connected with a water pipe 11 through an internally threaded steel pipe 7; a gate valve 10 and a pressure gauge 8 are arranged on the internally threaded steel pipe 7, and the pressure gauge 8 is arranged near one end of the externally connected reducing steel pipe 19.

[0024] The double-layer casing includes an outer casing 2 and an inner casing 3. A flange 6 is installed at the upper end of the inner casing 3. The upper end of the outer casing 2 is lower than the upper end of the inner casing 3, and the gap formed between the upper parts of the outer casing 2 and the inner casing 3 is the water outlet.

[0025] The outer casing 2 is provided with an orifice flange, and the inner casing 3 is provided with an orifice flange plate 6. Among them, the inner diameter dimension of the flange at the orifice of the conical sleeve 18 needs to be larger than the outer diameter dimensions of the orifice flange of the outer casing 2 and the orifice flange plate 6 of the inner casing 3.

[0026] The lower end of the externally connected reducing steel pipe 19 with a larger aperture is welded with a flange, and the upper end with a smaller aperture is turned with an external thread. The upper end of the externally connected reducing steel pipe 19 with a smaller aperture is threadedly connected to the internal thread steel pipe 7.

[0027] Embodiment 3 On the basis of Embodiment 2, further, the conical sleeve 18 is composed of two symmetrical halves. At the connection of the two parts, a rib plate and a fastener are welded and become an integral whole after being connected by bolts. The thickness of the conical sleeve 18 is 3 - 6 mm. A water stop rubber pad with a thickness of 2 - 5 mm is padded around the outer wall of the outer casing 2. The conical sleeve 18 is sleeved on the water stop rubber pad and the corresponding fasteners are tightened with bolts.

[0028] Embodiment 4 For the method for disposing the water between the walls of the high-pressure-bearing double-layer casing of the present invention, a conical sleeve 18, an externally connected reducing steel pipe 19 are manufactured, and a rubber sheath 13 is manufactured using a soft rubber tube; the periphery of the outer casing 3 is dug open, the conical sleeve 18 is installed on the outer casing 3, and then the externally connected reducing steel pipe 19 and the water pipe are installed using the rubber sheath 13 to smoothly export the water between the walls of the double-layer casing and perform pressure detection.

[0029] Embodiment 5 The method for disposing the water between the walls of the high-pressure-bearing double-layer casing specifically comprises the following operating steps: Step 1: Manufacture a conical sleeve 18, an externally connected reducing steel pipe 19, an internal thread steel pipe 7, and manufacture a rubber sheath 13 using a soft rubber tube; Step 2: Dig open the periphery of the outer casing 2 to excavate an outer excavation space 12 outside the casing to meet the needs of personnel operation and installation of the conical sleeve 18; close the gate valve 10 on the water pipe; Step 3: Sleeve the rubber sheath 13 under the orifice flange 4 of the outer casing and lock it with a double-layer stirrup 14. The rubber sheath 13 includes the entire gate valve 10 and the pressure gauge 8 including the water pipe. The other end of the rubber sheath 13 is tied to the water pipe 11 with a wire 24. Open the gate valve 10 and discharge the water sprayed out between the hole walls through the water pipe 11; Step 4: Polish the rust on the outer wall of the outer casing 2 with sandpaper or a file until clean; below the double-layer stirrup 14, place a water-stop rubber pad with a thickness of 2 - 5 mm around the outer wall of the outer casing 2, put the two semi-conical sleeves 18 on the water-stop rubber pad, and at the same time place a water-stop rubber pad with a thickness of 2 - 5 mm on the butt joint surface of the two semi-conical sleeves, then use the bolts 9 to tighten the corresponding fasteners 16 through the bolt holes 17. Step 5: Open the rubber sleeve 13 tied with wire, move the rubber sleeve 13 to a position below the water pipe pressure gauge 8, and disassemble the pressure gauge 8 and the gate valve 10. Step 6: Quickly connect the external reducing steel pipe 19 to the conical sleeve through the flange, and connect the other end to the internal thread steel pipe 7 through the orifice thread 20. Install the pressure gauge 8 and the gate valve 10 on the internal thread steel pipe 7, and connect the external water pipe 11 to the gate valve 10. Step 7: Close the gate valve 10, observe the water pressure value, compare it with the historical observation data to judge whether there is any abnormality, and then open the gate valve 10 to drain water so that the area between the conical sleeve 18 and the external reducing steel pipe 19 is in a non-pressure state. Step 8: Excavate a space 12 outside the casing to fix the circular formwork 21. The inner diameter of the circular formwork is 10 - 20 cm larger than the diameter of the space 12 excavated outside the casing. The upper part of the circular formwork 21 is more than 20 cm higher than the bottom of the conical sleeve 18, so that the bottom of the conical sleeve 18 is included in the circular formwork 21, and then pour impermeable cement in the circular formwork 21 to consolidate the space 12 excavated outside the bottom of the casing and the bottom of the conical sleeve 18 together. Step 9: After the cement has solidified, remove the circular formwork 21, close the gate valve 10, and observe the water pressure of the aquifer through the pressure gauge 8.

[0030] Example 6 (1) Measure the diameter of the outer casing 2, the outer diameter of the flange 4 at the outer casing opening, and the distance between the flange 4 at the outer casing opening and the flange of the inner casing hole of 3. (2) Use steel plate cutting and welding to fabricate the conical sleeve 18. The conical sleeve 18 consists of two symmetrical semi-cones. The conical tip part is truncated at a position where the inner diameter is 2 mm larger than the outer casing. The flange 15 at the top of the conical sleeve is welded to the larger end of the outer diameter of the conical sleeve. The rib plate 23 and the fastener 16 are welded at the butt joint position of the two semi-conical sleeves, and bolt holes 17 are reserved on the fastener.

[0031] (3) Use soft rubber hoses such as the inner layer tires of cars to fabricate the rubber sleeve 13. The inner diameter of the rubber sleeve needs to be larger than the flange of the casing opening so that it can be easily put on and can be folded to a position below the pressure gauge 8 to facilitate the disassembly of the pressure gauge 8.

[0032] (4)Fabricate an external reducing steel pipe 19 by welding steel pipes. Weld a flange 6 at the end of the reducing steel pipe with a larger aperture. The size of the flange is the same as that of the flange at the top of the conical sleeve. Machine a thread 20 at the end with a smaller aperture for butt-joint with the internal-thread steel pipe 7.

[0033] (5)Fabricate an internal-thread steel pipe 7 with the same diameter as the end of the external reducing steel pipe 19 with a smaller aperture. Machine an internal thread at one end for connection with the external reducing steel pipe through the thread. Weld a flange at the other end, and reserve a position for installing the 8-pressure transducer on the internal-thread steel pipe 7.

[0034] (6)Use tools such as pneumatic picks to dig around the outer layer of the sleeve 2 to excavate the external excavation space 12 outside the sleeve to meet the needs of personnel operation and installation of the conical sleeve 18 at the orifice.

[0035] (7)Close the orifice gate valve 10 and remove the external connection 11-water pipe at the orifice.

[0036] (8)Put the rubber sleeve 13 under the flange 4 at the orifice of the outer layer of the sleeve, and lock it with the double-layer stirrup 14. The rubber sleeve 13 encloses the entire orifice gate valve 10, pressure gauge 8, etc. Tie the other end to the water pipe 11 with 24-gauge wire to drain the water sprayed out between the hole walls through the water pipe 11.

[0037] (9)Use sandpaper or a file to polish the rust on the outer wall of the outer layer of the sleeve 2 until it is clean.

[0038] (10)Under the double-layer stirrup 14, pad a 2-5 mm thick water-stop rubber pad around the wall of the outer layer of the sleeve 2. Put the two halves of the conical sleeve 18 on the water-stop rubber pad. At the same time, pad a 2-5 mm thick water-stop rubber pad on the butt-joint surface of the two halves of the conical sleeve 18, and then use the 9-bolt to tighten the corresponding fastener 16 through the bolt hole 17.

[0039] (11)Open the water pipe 11 tied with wire 24, move the rubber sleeve 13 back to the position below the pressure gauge 8, and remove the pressure gauge 8 and the gate valve 10.

[0040] (12)Quickly connect the external reducing steel pipe 19 to the conical sleeve 18 through the flange 6. Pad a 2-5 mm thick water-stop rubber pad between the flanges 6. Connect the other end to the internal-thread steel pipe 7 through the orifice thread 20. Install the pressure gauge 8 and the gate valve 10 on the internal-thread steel pipe 7, and connect the external connection of the gate valve 10 to the water pipe 11.

[0041] (13)Close the gate valve 10, observe the water pressure value, compare it with the previously observed data to judge whether there is any abnormality, and then open the gate valve 10 to release water to make the area between the conical sleeve 18 and the external reducing steel pipe 19 in a non-pressure state.

[0042] (14) Excavate a space 12 outside the casing, fix a circular formwork 21. The inner diameter of the circular formwork is 10 - 20 cm larger than the diameter of the space 12 excavated outside the casing. The upper part of the formwork is more than 20 cm higher than the bottom of the conical sleeve 18, so that the bottom of the conical sleeve 18 is included in the circular formwork 21. Then pour impermeable cement 22 into the circular formwork 21 to consolidate the space 12 outside the bottom of the casing and the bottom of the conical sleeve 18 together.

[0043] (15) After the cement solidifies, remove the circular formwork 21, close the gate valve 10, and observe the water pressure of the aquifer through the pressure gauge 8. Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. High-pressure bearing double casing wall water outlet disposal device, characterized in that, It includes a double-layer casing arranged at the orifice of the long observation hole. A conical sleeve (18) is connected to the upper part of the double-layer casing. The upper end of the conical sleeve (18) with a larger aperture is also connected to an external reducing steel pipe (19) through a flange, and the lower end with a smaller aperture is connected to the double-layer casing; the upper end of the external reducing steel pipe (19) is connected to a water pipe (11) through an internal-thread steel pipe (7); a gate valve (10) and a pressure gauge (8) are arranged on the internal-thread steel pipe (7), and the pressure gauge (8) is arranged near one end of the external reducing steel pipe (19).

2. The high-pressure bearing water discharge treatment device between the double-layer casing walls according to claim 1, characterized in that, The double-layer casing includes an outer casing (2) and an inner casing (3). A flange plate (6) is installed at the upper end of the inner casing (3). The upper end of the outer casing (2) is lower than the upper end of the inner casing (3). The gap formed between the upper parts of the outer casing (2) and the inner casing (3) is the water outlet.

3. The high-pressure bearing water outlet disposal device between the double-layer casing walls according to claim 2, wherein The outer casing (2) is provided with an orifice flange, and the inner casing (3) is provided with an orifice flange plate; among them, the inner diameter dimension of the flange at the orifice of the conical sleeve (18) needs to be larger than the outer diameter dimensions of the orifice flange of the outer casing (2) and the orifice flange plate (6) of the inner casing (3).

4. The high-pressure bearing water outlet disposal device between double-layer casing walls according to claim 2, characterized in that, The lower end of the external reducing steel pipe (19) with a larger aperture is welded with a flange plate, and the upper end with a smaller aperture is turned with an external thread. The upper end of the external reducing steel pipe (19) with a smaller aperture is threadedly connected to the internal-thread steel pipe (7).

5. The high-pressure bearing water outlet treatment device between double-layer casing walls according to claim 3, characterized in that, The conical sleeve (18) is composed of two symmetrical halves. At the connection of the two parts, a rib plate and a fastener are welded and become an integral body after being connected by bolts. The thickness of the conical sleeve (18) is 3 to 6 mm.

6. The high-pressure bearing double-layer casing wall water outlet disposal device according to claim 4, wherein A water-stop rubber pad with a thickness of 2 to 5 mm is padded around the outer wall of the outer casing (2). The conical sleeve (18) is sleeved on the water-stop rubber pad and the corresponding fasteners are tightened by bolts.

7. Method for disposing water leakage between walls of high-pressure-bearing double-layer casing, characterized in that, Manufacture the conical sleeve (18), the external reducing steel pipe (19), and manufacture a rubber leather sleeve (13) using a soft rubber tube; dig open the periphery of the outer casing (3), install the conical sleeve (18) on the outer casing (3), and then install the external reducing steel pipe (19) and the water pipe using the rubber leather sleeve (13) to smoothly discharge the water between the double-layer casing walls and perform pressure detection.

8. The method for treating water leakage between the walls of a high-pressure-bearing double-layer casing according to claim 7, characterized in that, The specific operation steps are as follows: Step 1: Manufacture the conical sleeve (18), the external reducing steel pipe (19), the internal-thread steel pipe (7), and manufacture a rubber leather sleeve (13) using a soft rubber tube; Step 2: Dig open the periphery of the outer casing (2) to excavate an external excavation space (12) outside the casing to meet the needs of personnel operation and installation of the conical sleeve (18); close the gate valve (10) on the water pipe; Step 3: Sleeve the rubber leather sleeve (13) below the orifice flange (4) of the outer casing, lock it with a double-layer stirrup (14). The rubber leather sleeve (13) includes the entire gate valve (10) and pressure gauge (8) including the water pipe. Open the gate valve (10), tie the other end of the rubber leather sleeve (13) to the water pipe (11) with a wire (24), and discharge the water sprayed out between the hole walls through the water pipe (11). Step 4: Polish the rust on the outer wall of the outer casing (2) with sandpaper or a file; below the double-layer stirrups (14), pad a water-stop rubber pad with a thickness of 2-5 mm around the outer wall of the outer casing (2), put the two half-conical sleeves (18) on the water-stop rubber pad, and at the same time pad a water-stop rubber pad with a thickness of 2-5 mm on the butt joint surface of the two half-conical sleeves, and then use bolts (9) to tighten the corresponding fasteners (16) through the bolt holes (17); Step 5: Open the rubber sleeve (13) tied with iron wire, move the rubber sleeve (13) back to the position below the water pipe pressure gauge (8), and remove the pressure gauge (8) and the gate valve (10); Step 6: Quickly connect the external reducing steel pipe (19) to the conical sleeve through the flange, connect the other end to the internal threaded steel pipe (7) through the orifice thread (20), install the pressure gauge (8) and the gate valve (10) on the internal threaded steel pipe (7), and connect the external water pipe (11) to the gate valve (10); Step 7: Close the gate valve (10), observe the water pressure value, compare it with the historical observation data to judge whether there is any abnormality, and then open the gate valve (10) to release water so that the area between the conical sleeve (18) and the external reducing steel pipe (19) is in a non-pressure state; Step 8: Excavate a space (12) outside the casing to fix the circular formwork (21). The inner diameter of the circular formwork is 10-20 cm larger than the diameter of the excavation space (12) outside the casing. The upper part of the circular formwork (21) is more than 20 cm higher than the bottom of the conical sleeve (18) so that the bottom of the conical sleeve (18) is included in the circular formwork (21), and then pour impermeable cement in the circular formwork (21) to consolidate the excavation space (12) outside the bottom of the casing and the bottom of the conical sleeve (18) together; Step 9: After the cement sets, remove the circular formwork (21), close the gate valve (10), and observe the water pressure of the aquifer through the pressure gauge (8).

9. The method for treating water leakage between the walls of a high-pressure-bearing double-layer casing according to claim 8, characterized in that The specific steps of Step 1 are as follows: Step 1.1: Measure the diameter of the outer casing (2), the outer diameter of the flange (4) at the outer casing opening, and the distance between the flange (4) at the outer casing opening and the orifice flange of the inner casing (3); Step 1.2: Use steel plate cutting and welding to make the conical sleeve (18); Step 1.3: Use a soft rubber tube to make the rubber sleeve (13). The inner diameter of the rubber sleeve (13) needs to be larger than the flange of the double-layer casing opening to make it easy to put on; Step 1.4: Use steel pipe welding to make the external reducing steel pipe (19). Weld a flange at the larger-diameter end of the external reducing steel pipe (19). The flange size is the same as the top flange of the conical sleeve (18), and cut threads (20) at the smaller-diameter end to facilitate docking with the internal threaded steel pipe (7); Step 1.5: Make an internal threaded steel pipe (7) with the same diameter as the smaller-diameter end of the external reducing steel pipe (19), cut internal threads at one end to facilitate connection with the external reducing steel pipe through threads, weld a flange at the other end, and reserve a position for installing the pressure gauge (8) on the internal threaded steel pipe (7).

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