A frozen curtain construction device and method applied to broken well wall repair

Abstract

The application discloses a freezing curtain construction device and method applied to broken shaft wall repair, and relates to the technical field of artificial freezing engineering. The application comprises a shaft wall, a pressure relief groove is formed in the inner wall of the shaft wall, a freezing hole is formed in the inner wall of the shaft wall, and a freezing pipe assembly is arranged in the freezing hole. The freezing pipe assembly comprises a pipe wall, a water-soluble rubber layer is uniformly coated on the outer side of the pipe wall, a cavity is formed between the water-soluble rubber layer and the pipe wall, and sodium-based bentonite is arranged in the cavity. A liquid inlet pipe is arranged in the pipe wall and arranged in a concentric circle with the pipe wall. Compared with ground freezing, the technical scheme of the application not only greatly improves freezing efficiency but also greatly reduces engineering cost, and to a certain extent, reduces the harm caused by water and sand inrush. The formed freezing curtain can completely seal water, and greatly improves the safety during the shaft wall slotting construction.

Description

Technical Field

[0001] This invention relates to the field of artificial freezing engineering, and in particular to a freezing curtain construction device and method for repairing broken well walls. Background Technology

[0002] The freezing method is a special construction technique that uses artificial freezing technology to freeze the water in the strata, transforming natural rock and soil into frozen soil. This increases the strength and stability of the soil and isolates groundwater from underground engineering works, allowing for wellbore or underground engineering excavation and construction under the protection of a frozen wall. Essentially, it uses artificial cooling to temporarily alter the physical properties of the rock and soil, achieving the purpose of ground reinforcement. The frozen soil wall is a temporary support; it thaws when the freezing ends. For well wall rupture accidents, current technology generally uses the method of creating pressure relief trenches for remediation.

[0003] In existing technologies, full-depth freezing is often used to repair damaged well walls. However, in recent years, the depth of wells has gradually increased, and the depth of trenching has also increased. Water and sand inrush accidents may occur when opening pressure relief trenches. This freezing method starts from drilling from the ground, which not only increases construction costs and reduces freezing efficiency, but also generates a large frost heave pressure on the intact well wall above, which may cause damage to the intact well wall. Therefore, we propose a freezing curtain construction device and method for repairing broken well walls. Summary of the Invention

[0004] To address the aforementioned shortcomings, the present invention aims to provide a freezing curtain construction device and method for repairing broken well walls, which can mitigate the problems of water and sand inrush after drilling and prevent further damage to the well wall.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A freezing curtain construction device for repairing fractured well walls includes:

[0007] The well wall has a pressure relief groove on its inner wall and a freezing hole on its inner wall, and a freezing pipe assembly is installed inside the freezing hole.

[0008] The freezing tube assembly includes a tube wall, the outer side of which is uniformly covered with a water-soluble rubber layer, and a cavity is formed between the water-soluble rubber layer and the tube wall, the cavity being filled with sodium-based bentonite.

[0009] An inlet pipe is installed inside the pipe wall, and the inlet pipe is arranged concentrically with the pipe wall.

[0010] A liquid outlet pipe is installed at the top of the front end of the pipe wall for discharging low-temperature brine;

[0011] A pressure relief pipe is installed at the bottom of the front end face of the pipe wall, and the pressure relief pipe runs through the entire pipe wall. A sealing valve is provided on the outside of the pressure relief pipe for closing the pressure relief pipe. A temperature sensor is installed at the top of one end face of the pipe wall for measuring the freezing temperature field of the stratum.

[0012] Furthermore, the inlet pipe has a diameter of 28mm and is made of low-temperature, low-carbon steel, and is connected to the pipe wall by seamless welding.

[0013] Furthermore, the outlet pipe and the pressure relief pipe are both 14mm in diameter, made of low-temperature low-carbon steel, and are connected to the pipe wall by seamless welding.

[0014] Furthermore, the water-soluble rubber layer is made of a rubber material that dissolves in water.

[0015] According to one aspect of the present invention, a method for constructing a frozen curtain for repairing fractured well walls is provided, comprising the following steps:

[0016] (1) Select the location for opening the pressure relief groove on the well wall, first open the freezing holes perpendicular to the well wall on the upper and lower sides of the pressure relief groove location, and install the freezing pipe assembly in the freezing hole. After installation, close the sealing valve and perform a pressure test and leak detection test on the freezing pipe assembly.

[0017] (2) Connect the inlet and outlet pipes of the installed freezing pipe assembly with flexible hoses and form a circulation pipeline with the ground refrigeration station;

[0018] (3) Wrap the pipes containing low-temperature brine that are exposed to the air with an insulation layer;

[0019] (4) Start the refrigeration station to freeze the soil and rock layers. When the freezing temperature field monitored by the temperature sensor no longer changes, it indicates that the freezing curtain has been formed. At this time, the construction of the pressure relief trench will begin.

[0020] Furthermore, the freezing holes are located within a vertical range of 5.625m above and below the center of the pressure relief groove;

[0021] Furthermore, the freezing holes are arranged in 5 rows on each of the upper and lower sides of the pressure relief groove, and the spacing between each row of freezing holes is 1.25m.

[0022] Furthermore, each row of the freezing holes contains eight holes, and the eight freezing holes are distributed in a ring at equal intervals.

[0023] Furthermore, the hose is made of low-temperature resistant polyethylene.

[0024] Furthermore, the insulation layer is made of rock wool pipe.

[0025] The present invention has at least the following beneficial effects:

[0026] (1) The freezing pipe assembly designed in this invention incorporates a pressure relief pipe, which not only reduces the pressure when the freezing pipe assembly is placed into the freezing hole, but also provides a sealing valve on the outside of the pressure relief pipe. When the pressure relief and sealing freezing pipe is placed into the freezing hole, the sealing valve is closed, which can also prevent water and sand from flowing and improve freezing efficiency.

[0027] (2) The outer layer of the freezing pipe assembly designed in this invention is coated with sodium bentonite wrapped with a water-soluble rubber layer. It has strong water absorption and can absorb water equivalent to 8 times its own volume. Its volume expands by 10 to 30 times, which can play a good role in sealing water. After freezing, it can tightly bond the freezing pipe assembly with the rock and soil layer, thus playing a role in completely sealing water.

[0028] (3) The construction method of the freezing pipe assembly provided by the present invention only involves drilling and freezing within a certain range above and below the pressure relief groove, which not only improves the freezing efficiency and achieves complete water sealing, but also greatly reduces the construction cost and ensures construction safety.

[0029] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0030] Figure 1 This is a front view of the freezing tube assembly of the present invention;

[0031] Figure 2 This is a top view of the freezing tube assembly of the present invention;

[0032] Figure 3 for Figure 1 Cross-sectional view at point I-I;

[0033] Figure 4 for Figure 1 Side view of the freezing tube assembly;

[0034] Figure 5 This is a side sectional view of the overall structure of the present invention;

[0035] Figure 6 This is a top-section schematic diagram of the overall structure of the present invention.

[0036] Figure label:

[0037] 1. Pipe wall; 2. Water-soluble rubber layer; 3. Sodium bentonite; 4. Sealing valve; 5. Pressure relief pipe; 6. Inlet pipe; 7. Outlet pipe; 8. Temperature sensor; 9. Soil and rock layer; 10. Pressure relief groove; 11. Freezing curtain; 12. Freezing pipe assembly; 13. Well wall; 14. Freezing hole. Detailed Implementation

[0038] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0039] like Figures 1 to 4 As shown, this embodiment of the invention provides a construction device for a frozen curtain 11 applied to the repair of a broken well wall 13, comprising:

[0040] Well wall 13, with pressure relief groove 10 on the inner wall of well wall 13, and freezing hole 14 on the inner wall of well wall 13, with freezing pipe assembly 12 installed inside the freezing hole 14.

[0041] The freezing tube assembly 12 includes a tube wall 1, the outer side of which is uniformly covered with a water-soluble rubber layer 2, and a cavity is formed between the water-soluble rubber layer 2 and the tube wall 1, the cavity being filled with sodium-based bentonite.

[0042] It should be noted that the tube wall 1 of the freezing tube assembly 12 is bonded to the water-soluble rubber layer 2 using adhesive bonding. The specific operation is as follows:

[0043] First, use an angle grinder with a tungsten carbide disc to grind the surface of the bonding part of the freezing tube assembly 12 and the rubber surface to increase the surface roughness. After grinding, use a cleaning agent to wash away the surface grease and stains. After the cleaning agent dries, apply a layer of metallic primer to the bonding part of the freezing tube assembly 12 to protect the steel surface from corrosion. Then, apply the mixed cold vulcanizing adhesive (SK313) to the bonding part of the freezing tube assembly 12 and the rubber surface, preferably in two coats. When the adhesive is slightly sticky to the back of your finger, attach the rubber to the bonding part of the freezing tube assembly 12 and tamp it firmly with a rubber mallet.

[0044] Furthermore, bentonite, according to its transliteration, is a hydrous clay mineral mainly composed of montmorillonite. Due to its special properties, such as swelling, binding, adsorption, catalysis, thixotropy, suspension, and cation exchange, it is widely used in various industrial fields. Sodium-based bentonite is classified according to the types and contents of exchangeable cations between montmorillonite layers: those with an alkalinity coefficient greater than or equal to 1 are sodium-based bentonite, and those less than 1 are calcium-based bentonite. For the technical solution of this application, sodium-based bentonite is preferred. When it absorbs water and expands, it can play a good role in sealing water. After it freezes, it can tightly bond the freezing pipe assembly 12 with the rock and soil layer 9, achieving a complete water sealing effect.

[0045] The inside of the pipe wall 1 is equipped with an inlet pipe 6. The inlet pipe 6 is arranged concentrically with the pipe wall 1. The diameter of the inlet pipe 6 is 28mm. It is made of low-temperature low-carbon steel and is connected to the pipe wall 1 by seamless welding. It has good sealing performance so that the low-temperature brine can be evenly filled into the entire freezing pipe assembly 12.

[0046] The top of the front end of the pipe wall 1 is equipped with a liquid outlet pipe 7, which can ensure that the low temperature brine fills the entire freezing pipe assembly 12, freezes the surrounding soil and rock layer 9, and then discharges it through the liquid outlet pipe 7. The liquid outlet pipe 7 has a diameter of 14mm and is made of low temperature low carbon steel. It is seamlessly welded to the pressure relief and sealing water freezing pipe, and has good sealing performance.

[0047] A pressure relief pipe 5 is installed at the bottom of the front end face of the pipe wall 1. The pressure relief pipe 5 has a diameter of 14mm and is made of low-temperature low-carbon steel. The pressure relief pipe 5 is connected to the pipe wall 1 by seamless welding, which has good sealing performance. The pressure relief pipe 5 runs through the entire pipe wall 1, which can effectively reduce the pressure of water and sand inrush encountered by the freezing pipe assembly 12 when it is inserted into the freezing hole 14. A sealing valve 4 is provided on the outside of the pressure relief pipe 5. After the freezing pipe assembly 12 is inserted into the freezing hole 14, the sealing valve 4 is closed to stop the flow of water and sand, which facilitates the improvement of freezing efficiency. A temperature sensor 8 is installed on the top of one end face of the pipe wall 1 to measure the freezing temperature field of the stratum. When the temperature of the freezing temperature field no longer changes, the freezing curtain 11 can be formed.

[0048] like Figures 5 to 6 As shown, according to one aspect of the present invention, the present invention provides a method for constructing a frozen curtain 11 for repairing a broken well wall 13, comprising the following steps:

[0049] (1) Select the location for opening the pressure relief groove 10 on the well wall 13 in advance, and drill freezing holes 14 perpendicular to the well wall 13 within a range of 5.625m above and below the location for opening the pressure relief groove 10. The arrangement of the freezing holes 14 is as follows:

[0050] In the vertical direction: there are five rows of freezing holes 14 above and below the pressure relief groove 10, and the spacing between each row of freezing holes 14 is 1.25m;

[0051] In the horizontal direction: each row of freezing holes 14 contains eight freezing holes 14, and the eight freezing holes 14 are distributed in a ring at equal intervals;

[0052] After the freezing holes 14 are arranged, the freezing pipe assembly 12 is installed in each freezing hole 14. After installation, the sealing valve 4 is closed, and a pressure test and leak detection test are performed on the freezing pipe assembly 12.

[0053] (2) Connect the inlet pipe 6 and outlet pipe 7 of the installed freezing pipe assembly 12 with a polyethylene plastic hose that has good heat insulation and high flexibility at low temperature, and form a circulation pipeline with the ground refrigeration station.

[0054] (3) Wrap the pipes containing low-temperature brine that are exposed to the air with an insulation layer, the insulation layer being made of rock wool pipe;

[0055] (4) Start the refrigeration station to freeze the soil layer 9. When the freezing temperature field monitored by the temperature sensor 8 no longer changes, it indicates that the freezing curtain 11 has been fully formed. At this time, the construction of the pressure relief trench 10 can begin.

[0056] In summary, the technical solution provided by this invention not only reduces the pressure when the freezing pipe assembly 12 is inserted into the freezing hole 14, but also provides a sealing valve 4 on the outside of the pressure relief pipe 5. After the pressure relief and water sealing freezing pipe is inserted into the freezing hole 14, closing the sealing valve 4 can prevent water and sand from flowing, thereby improving freezing efficiency. Furthermore, the use of sodium-based bentonite can also play a good role in sealing water after it absorbs water and expands. After freezing, it can tightly bond the freezing pipe assembly 12 with the soil layer 9, achieving complete water sealing. This not only greatly reduces construction costs but also ensures construction safety.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another element, it may be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0060] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A freezing curtain construction device applied to broken shaft wall repair, characterized in that, Include: The well wall (13), the inner wall of the well wall (13) is provided with pressure relief groove (10), the inner wall of the well wall (13) is provided with freezing hole (14), the inside of freezing hole (14) is provided with freezing pipe assembly (12); The freezing pipe assembly (12) includes a pipe wall (1), the outer side of the pipe wall (1) is uniformly coated with a water-soluble rubber layer (2), and a cavity is formed between the water-soluble rubber layer (2) and the pipe wall (1), and the cavity is provided with sodium bentonite; The inside of the pipe wall (1) is provided with a liquid inlet pipe (6), and the liquid inlet pipe (6) and the pipe wall (1) are arranged in concentric circles; The top of the front end of the pipe wall (1) is provided with a liquid outlet pipe (7) for discharging low-temperature brine; The bottom of the front end of the pipe wall (1) is provided with a pressure relief pipe (5), the pressure relief pipe (5) penetrates through the whole pipe wall (1), slows down the pressure of water and sand gushing when the freezing pipe assembly (12) is put into the freezing hole (14), the outside of the pressure relief pipe (5) is provided with a sealing valve (4), after the freezing pipe assembly (12) is put into the freezing hole (14), the sealing valve (4) is closed, so that water and sand no longer flow, and the top of one end of the pipe wall (1) is provided with a temperature sensor (8) for measuring the freezing temperature field of the stratum; The diameter of the liquid outlet pipe (7) and the pressure relief pipe (5) is 14mm, and they are made of low-temperature low-carbon steel, and the liquid outlet pipe (7) and the pressure relief pipe (5) are connected with the pipe wall (1) by seamless welding.

2. A device for construction of a frozen wall (11) for repair of a broken shaft wall (13) according to claim 1, characterized in that, The diameter of the liquid inlet pipe (6) is 28mm, which is made of low-temperature low-carbon steel, and is connected with the pipe wall (1) by seamless welding.

3. A device for construction of a frozen wall (11) for repair of a broken shaft wall (13) according to claim 2, characterized in that, The water-soluble rubber layer (2) is made of water-soluble rubber material.

4. A method for freezing curtain construction for broken shaft wall repair, using the freezing curtain construction device for broken shaft wall (13) repair according to any one of claims 1 to 3, characterized in that, The steps include: (1) the position of the pressure relief groove (10) is preselected on the well wall (13), the freezing hole (14) perpendicular to the well wall (13) is first opened on the upper and lower sides of the pressure relief groove (10), and the freezing pipe assembly (12) is installed in the freezing hole (14), after installation, the sealing valve (4) is closed and the freezing pipe assembly (12) is tested for pressure leakage; (2) the liquid inlet pipe (6) and the liquid outlet pipe (7) of the installed freezing pipe assembly (12) are connected by a hose, and a circulating pipeline is formed with the ground refrigeration station; (3) the pipeline with low-temperature brine exposed to air and contacted with air is wrapped with a heat preservation layer; (4) start the refrigeration station, freeze the rock-soil layer (9), when the freezing temperature field monitored by the temperature sensor (8) no longer changes in temperature, it indicates that the freezing curtain (11) is formed, at this time, the pressure relief groove (10) is started to be opened and constructed.

5. A method of freezing curtain construction for application to broken shaft wall repair according to claim 4, characterized in that, The freezing hole (14) is located in the range of 5.625m above and below the center vertical height of the pressure relief groove (10).

6. A method of freezing curtain construction for application to broken shaft wall repair according to claim 5, characterized in that, The freezing hole (14) is opened on both sides of the pressure relief groove (10) in 5 rows, and the spacing between each row of freezing holes (14) is 1.25m.

7. A method of constructing a freeze wall for use in a shaft wall repair according to claim 6, wherein, The number of freezing holes (14) in each row is eight, and the eight freezing holes (14) are distributed in a ring shape with equal spacing.

8. The method for freezing curtain construction applied to broken shaft wall repair according to claim 5, characterized in that, The hose is made of low-temperature resistant polyethylene material.

9. The method for freezing curtain construction applied to broken shaft wall repair according to claim 5, characterized in that, The material of the heat preservation layer is rock wool tube.

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