Device for quickly plugging pressure reduction well of confined aquifer

By using expandable grouting capsules and positioning steel sleeves in the pressure-bearing aquifer pressure-bearing well, the problems of long sealing time and high risk in the prior art are solved, and a fast and safe well pipe sealing effect is achieved.

CN222834938UActive Publication Date: 2025-05-06SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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Patent Information

Application Number
CN202421581925.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-05
Publication Date
2025-05-06
Estimated Expiration
2034-07-05

AI Technical Summary

Technical Problem

The prior art has problems of long time and high risks when sealing the pressure-bearing aquifer pressure-bearing well, especially in the case of high pressure-bearing, the water level rises faster after the pumping is stopped, and there are certain safety risks when sealing the well.

Method used

The inflatable grouting capsule and positioning steel casing are used to inject fast solidification slurry into the grouting capsule, so as to expand the grouting capsule, driving the positioning steel casing to expand and position it in the well tube, thereby achieving rapid sealing.

Benefits of technology

It realizes rapid sealing of the well pipe under any construction situation, simple operation, short construction time, high safety, and can be sealed without removing the bottom plate. It is suitable for any water head and working conditions.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a device for quickly plugging a pressure reducing well of a confined aquifer, which is mounted in a well casing of the pressure reducing well and comprises a grouting capsule. The positioning steel clamping sleeve is connected with the grouting capsule; the left-hand nut joint is connected with the grouting capsule, and a one-way valve is arranged at one end, located at the grouting capsule, of the left-hand nut joint; the grouting drill rod is connected with the left-hand thread male connector and detachably connected with the left-hand thread female connector in a screwed mode. And after rapid solidification slurry is injected into the grouting capsule, the grouting capsule expands, and the positioning steel clamping sleeve expands along with the grouting capsule and is positioned in the well casing. According to the plugging device, the requirement for plugging at any selected position in a well under pressure can be met, after grout is injected into the grouting capsule, the grouting capsule drives the steel clamping sleeve to expand together and be positioned in the well casing, operation is easy, construction time is short, plugging can be achieved without dismantling the bottom plate, and construction safety is high. The plugging device disclosed by the utility model is clear in principle, simple in structure, practical and reliable, and can meet the requirements of plugging in the confined water depressurization well under any water head, any position in the well casing and any working condition.
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Description

Technical Field

[0001] The utility model relates to the technical field of building deep foundation pit dewatering, in particular to a device for quickly plugging a pressure-reducing well in a pressurized aquifer. Background Art

[0002] With the development of urban construction, deep foundation pit projects are increasing day by day. A large number of deep foundation pit projects involve the risk prevention and control of sudden surges in pressurized aquifers. During the excavation of the foundation pit, measures such as water-stop curtain isolation and temporary pressure reduction are taken for the pressurized aquifers involving project safety. When the foundation slab construction is completed and the structure is backbuilt to meet safety requirements, the pressurized water pressure reduction wells need to be sealed.

[0003] At present, the commonly used sealing methods in engineering projects are divided into methods such as sealing the well with steel plates and flanges at the bottom plate, and welding sealing devices in the well under the bottom plate. Among them, the flange sealing and welding steel plates after grouting take a long time. The welding sealing device in the well under the bottom plate must be removed from the pressure-reducing well to the bottom plate before construction. The above methods belong to wellhead sealing technology, and all require auxiliary precipitation to be implemented. For high-pressure aquifers, there are certain risks when sealing the well due to the rapid rise in water level after pumping is stopped. Utility Model Content

[0004] The purpose of the utility model is to provide a device for quickly plugging a pressure-bearing aquifer depressurization well in accordance with the above-mentioned deficiencies of the prior art, which can plug the well pipe under any construction conditions by adopting an expandable grouting capsule and a positioning steel sleeve.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A device for rapid plugging of a pressure-reducing well in a confined aquifer, installed in a well pipe of the pressure-reducing well, characterized in that it comprises:

[0007] Grouting capsule;

[0008] A positioning steel ferrule connected to the grouting capsule;

[0009] A reverse thread female connector connected to the grouting capsule and provided with a one-way valve at one end of the grouting capsule;

[0010] The grouting drill rod is connected to a reverse thread male joint, which is detachably screwed to the reverse thread female joint;

[0011] When the rapid solidification slurry is injected into the grouting capsule, the grouting capsule expands, and the positioning steel sleeve expands along with the grouting capsule and is positioned in the well pipe.

[0012] The positioning steel clamping sleeve includes a plurality of steel clamping parts, and the plurality of steel clamping parts are evenly distributed along the circumference of the grouting capsule.

[0013] The steel clamp comprises:

[0014] A top positioning plate located above the grouting capsule;

[0015] a bottom positioning plate located below the grouting capsule; and

[0016] A side rib plate connecting the top positioning plate and the bottom positioning plate.

[0017] The positioning steel sleeve is formed with a mounting hole above the grouting capsule for the grouting drill rod to connect to the reverse thread male joint through, and each of the top positioning plates has an arc-shaped notch that forms the mounting hole after splicing.

[0018] The grouting capsule is evenly provided with a plurality of fixing belts for connecting the steel clamps at circumferential positions of the side wall.

[0019] The grouting capsule is an elastic rubber grouting capsule, which has a hollow structure and is provided with a mounting opening.

[0020] The reverse thread female connector is connected to the installation port, and the input end of the female connector is exposed outside the grouting capsule, the output end is located in the grouting capsule, and the one-way valve is connected to the output end.

[0021] The output end of the grouting drill rod connected to the reverse thread male joint passes through the mounting hole and is connected to the input end of the reverse thread female joint, and the input end of the grouting drill rod connected to the reverse thread male joint is located outside the positioning steel ferrule.

[0022] The reverse thread female joint has a first grouting hole, and the grouting drill rod connecting male joint has a second grouting hole. After the grouting drill rod connecting reverse thread male joint and the reverse thread female joint are connected, the first grouting hole and the second grouting hole are connected.

[0023] The input end of the grouting drill rod connecting reverse thread male connector has a first connecting thread, and the output end has a second connecting reverse thread with a thread direction opposite to that of the first connecting thread. The input end of the reverse thread female connector has a third connecting reverse thread matching the second connecting reverse thread.

[0024] The advantages of the utility model are:

[0025] The plugging device of the utility model can meet the demand of pressure plugging. After the slurry is injected into the grouting capsule, the grouting capsule drives the positioning steel ferrule to expand and position in the well pipe. The operation is simple, the construction time is short, and the plugging can be achieved without removing the bottom plate, and the construction safety is high. The plugging device of the utility model has a clear principle, a simple structure, and is practical and reliable. It can meet the well plugging of the pressure-bearing water decompression well under any water head, any position in the well pipe, and any working conditions. It is easy to operate on site, convenient for actual engineering applications, and has high plugging construction efficiency. It has good economy and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the rapid blocking device of the utility model;

[0027] Figure 2 for Figure 1 Sectional view at ABC;

[0028] Figure 3 It is a structural schematic diagram of the male joint and the female joint of the grouting drill rod of the utility model;

[0029] Figure 4 This is a schematic diagram of the installation of the quick plugging device of the utility model in the well pipe;

[0030] Figure 5 It is a schematic diagram of the structure of the rapid plugging device of the utility model being expanded and positioned in the well pipe;

[0031] Figure 6 for Figure 5 Cross-sectional view at DEF in the figure. DETAILED DESCRIPTION

[0032] The marks in the figure are: 1. grouting drill pipe connecting reverse thread male joint, 2. top positioning plate, 3. reverse thread female joint, 4. one-way valve, 5. grouting capsule, 6. side rib plate, 7. bottom positioning plate, 8. grouting drill pipe, 9. well pipe, 10. fast-setting slurry, 11. first connecting thread, 12. second connecting reverse thread, 13. second grouting hole, 20. mounting hole, 30. connection, 31. third connecting reverse thread, 32. second grouting hole, 51. fixing belt.

[0033] Example: See Figure 1 and Figure 2As shown, a device for rapid plugging of a pressure-bearing aquifer depressurization well in an embodiment is shown, which is installed in the well pipe 9 of the depressurization well, and includes a grouting capsule 5; a positioning steel ferrule connected to the grouting capsule 5; a reverse thread female joint 3 connected to the grouting capsule 5 and provided with a one-way valve 4 at one end of the grouting capsule 5; a grouting drill pipe connecting male joint 1, which passes through the steel ferrule and is detachably screwed to the reverse thread female joint 3; when the fast-setting slurry is injected into the grouting capsule 5, the grouting capsule 5 expands, and the positioning steel ferrule expands together with the grouting capsule 5 and is positioned in the well pipe 9.

[0034] In this embodiment, the positioning steel clamping sleeve includes a plurality of steel clamping parts, and the plurality of steel clamping parts are evenly distributed along the circumference of the grouting capsule 5 .

[0035] In this embodiment, the steel clamp includes a top positioning plate 2 located above the grouting capsule 5; a bottom positioning plate 7 located below the grouting capsule 5; and a side rib plate 6 connecting the top positioning plate 2 and the bottom positioning plate 7.

[0036] In this embodiment, a mounting hole 20 is formed on the steel ferrule above the grouting capsule 5 for the grouting drill rod connecting male joint 1 to pass through, and each top positioning plate 2 has an arc-shaped notch that forms the mounting hole 20 after splicing.

[0037] In this embodiment, the grouting capsule 5 is evenly provided with a plurality of fixing belts 51 for connecting the steel clamps at circumferential positions of the side wall.

[0038] In this embodiment, Figure 3 As shown, the grouting capsule 5 is an elastic rubber grouting capsule, the grouting capsule 5 is a hollow structure and is provided with a connection portion 30 for installation.

[0039] In this embodiment, the reverse female connector 3 is fixedly connected to the connection 30, and the input end of the reverse female connector 3 is exposed outside the grouting capsule 5, the output end is located inside the grouting capsule 5, and the one-way valve 4 is connected to the output end.

[0040] In this embodiment, Figure 1 and Figure 5 As shown, the output end of the grouting drill rod connected to the reverse thread male connector 1 passes through the mounting hole 20 and is connected to the input end of the female connector 4, and the input end of the grouting drill rod connected to the reverse thread male connector 1 is located outside the steel ferrule.

[0041] In this embodiment, Figure 3 As shown, the reverse-wire female joint 3 has a first grouting hole 32, and the grouting drill rod connected reverse-wire male joint 1 has a second grouting hole 13. After the grouting drill rod connected reverse-wire male joint 1 and the reverse-wire female joint 3 are connected, the first grouting hole 32 and the second grouting hole 13 are connected.

[0042] In this embodiment, the input end of the grouting drill rod connecting reverse thread male connector 1 has a first connecting thread 11, and the output end has a second connecting reverse thread 12 with a thread direction opposite to that of the first connecting thread 11, and the input end of the reverse thread female connector 3 has a third connecting reverse thread 31 matching the second connecting reverse thread 12.

[0043] The characteristics and functions of the present invention can be further understood through the following description.

[0044] This embodiment mainly discloses a device for rapid plugging of a pressure-reducing well in a confined aquifer, comprising a special steel well pipe 9, a grouting capsule 5, a steel ferrule for positioning the grouting capsule, a reverse thread female joint 3 with a one-way valve 4, and a reverse thread male and female joint 1 for connecting a grouting drill pipe, wherein the positioning steel ferrule comprises a plurality of steel clips, and the steel clips are composed of three parts: a top / bottom positioning plate 2 / 7 and a side rib plate 6. The reverse thread female joint 3 is connected to the grouting capsule 5 as a whole, and the steel ferrule is connected to the grouting capsule 5 through a fixing belt 51 on the outside of the grouting capsule 5, and constrains the deformation shape of the grouting capsule 5 in various states. The reverse thread female joint 3, the grouting capsule 5, and the positioning steel ferrule form a fixed combination.

[0045] Rapid plugging is achieved through the above structural combination, and the implementation method of rapid plugging includes the following steps:

[0046] Step (1) constructing a pressure-reducing well, installing a special steel well pipe of the same size as the pressure-reducing well at the location to be blocked, and forming an integral part with the pressure-reducing well pipe;

[0047] Step (2) normal depressurization operation of the dewatering well to meet the pressure control requirements of the pressure head;

[0048] Step (3) the grouting drill rod is connected to the above-mentioned fixed assembly via the grouting drill rod connecting male and female joints;

[0049] After the step (4) of reducing the pressure and pumping the water is completed, the grouting drill pipe and the above-mentioned fixing assembly are placed in the position of the special steel well pipe;

[0050] Step (5) injecting fast-setting slurry through the grouting drill pipe and the one-way valve according to the plugging pressure requirement;

[0051] Step (6) the grouting rubber capsule expands and drives the grouting capsule positioning steel sleeve into the well wall positioning groove of the special steel well pipe;

[0052] Step (7) After the grouting is completed, the grouting drill rod is rotated forward and withdrawn together with the male and female joints connected to the grouting drill rod;

[0053] Step (8) The well pipe can be sealed to the structural bottom plate without pressure as required.

[0054] More specifically, the grouting drill rod 8 is first connected to the plugging device of the present embodiment, and the grouting drill rod 8 is connected to the first connecting thread 11 of the grouting drill rod connecting reverse thread male joint 1. When the water level drops to the normal working condition, the plugging device is directly suspended and installed into the well pipe 9 (such as Figure 4 As shown), the quick-setting slurry 10 is then injected into the grouting capsule 5 through the grouting drill pipe 8, the grouting drill pipe connecting reverse thread male joint 1, the reverse thread female joint 3 and the one-way valve 4. The grouting capsule 5 expands rapidly and drives the positioning steel ferrule to expand at the same time. The top positioning plate 2, the side rib plate 6 and the bottom positioning plate 7 all expand and are fixedly positioned with the well pipe 9 (as shown). Figure 5 and Figure 6 as shown).

[0055] in addition, Figure 1 and Figure 2 It is a schematic diagram of the structure of the plugging device, and the cross-sectional views at three positions ABC, as shown in Figure 2 As shown, AA is a cross-sectional view of the top positioning plate, BB is a cross-sectional view of the side rib plate 6, and CC is a cross-sectional view of the bottom positioning plate 7. The bottom positioning plate 2 is also formed with a mounting hole 20 for the grouting drill rod to connect the reverse thread male connector 1 to pass through.

[0056] Figure 3 It is a schematic diagram of the structure after the grouting drill rod connection reverse thread male joint 1 and the reverse thread female joint 3 are separated, wherein the grouting drill rod 8 and the first connecting thread 11 can be tightened relatively, and the second connecting reverse thread 12 and the third connecting reverse thread 13 are the structure in which the grouting drill rod connection reverse thread male joint 1 is separated from the reverse thread female joint 3 when the grouting drill rod 8 continues to be tightened, so as to facilitate the recovery of the grouting drill rod connection reverse thread male joint 1.

[0057] Figure 4 It is a schematic diagram of the plugging device being suspended and installed into the well pipe 9.

[0058] Figure 5 and Figure 6 It is a schematic diagram of the expansion and fixed positioning of the plugging device in the well pipe 9, wherein DD is a cross-sectional view at the top positioning plate, EE is a cross-sectional view at the side rib plate 6, and FF is a cross-sectional view at the bottom positioning plate 7.

[0059] In summary, the plugging device of the utility model can meet the demand for pressure plugging. After the slurry is injected into the grouting capsule, the grouting capsule drives the positioning steel ferrule to expand and position in the well pipe. The operation is simple, the construction time is short, and the plugging can be achieved without removing the bottom plate, and the construction safety is high. The plugging device of the utility model has a clear principle, a simple structure, and is practical and reliable. It can meet the well plugging of pressurized water decompression wells under any water head, any position in the well pipe, and any working conditions. It is easy to operate on site, convenient for actual engineering applications, and has high plugging construction efficiency. It has good economy and practicality.

[0060] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for rapid plugging of a pressure-reducing well in a confined aquifer, installed in the well pipe of the pressure-reducing well, characterized in that: include: Grouting capsule; A positioning steel ferrule connected to the grouting capsule; A reverse thread female connector connected to the grouting capsule and provided with a one-way valve at one end of the grouting capsule; The grouting drill rod is connected to a reverse thread male joint, which is detachably screwed to the reverse thread female joint; When the rapid solidification slurry is injected into the grouting capsule, the grouting capsule expands, and the positioning steel sleeve expands along with the grouting capsule and is positioned in the well pipe.

2. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 1, characterized in that: The positioning steel clamping sleeve includes a plurality of steel clamping parts, and the plurality of steel clamping parts are evenly distributed along the circumference of the grouting capsule.

3. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 2, characterized in that: The steel clamp comprises: a top positioning plate located above the grouting capsule; a bottom positioning plate located below the grouting capsule; and A side rib plate connecting the top positioning plate and the bottom positioning plate.

4. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 3, characterized in that: The positioning steel sleeve is formed with a mounting hole above the grouting capsule for the grouting drill rod to connect to the reverse thread male joint through, and each of the top positioning plates has an arc-shaped notch that forms the mounting hole after splicing.

5. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 4, characterized in that: The grouting capsule is evenly provided with a plurality of fixing belts for connecting the steel clamps at circumferential positions of the side wall.

6. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 5, characterized in that: The grouting capsule is an elastic rubber grouting capsule, which has a hollow structure and is provided with a mounting opening.

7. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 6, characterized in that: The reverse thread female connector is connected to the installation port, and the input end of the female connector is exposed outside the grouting capsule, the output end is located in the grouting capsule, and the one-way valve is connected to the output end.

8. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 7, characterized in that: The output end of the grouting drill rod connected to the reverse thread male connector passes through the mounting hole and is connected to the input end of the reverse thread female connector, and the input end of the grouting drill rod connected to the reverse thread male connector is located outside the positioning steel sleeve.

9. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 8, characterized in that: The reverse-thread female joint has a first grouting hole, and the grouting drill rod connecting male joint has a second grouting hole. After the grouting drill rod connecting reverse-thread male joint and the reverse-thread female joint are connected, the first grouting hole and the second grouting hole are connected.

10. The device for rapid plugging of a pressure-reducing well in a confined aquifer according to claim 9, characterized in that: The input end of the grouting drill rod connecting reverse thread male connector has a first connecting thread, and the output end has a second connecting reverse thread with a thread direction opposite to that of the first connecting thread. The input end of the reverse thread female connector has a third connecting reverse thread matching the second connecting reverse thread.