A portable liquid nitrogen freezer water sealing device

Abstract

This invention provides a portable liquid nitrogen freezer for water sealing, belonging to the field of underground engineering freezing construction technology. It includes a freezer body, an outer shell, and a water-absorbing and expanding material. The freezer body is a liquid nitrogen freezer capable of freezing the surrounding soil. An outer shell surrounds the freezer body, and the freezer body is inserted into the shell, forming a protective enclosure. The water-absorbing and expanding material is placed on the outer wall of the shell, which absorbs water at the water inrush point and expands to seal the gap between the shell and the surrounding soil, freezing the water inrush point. After the freezer body, outer shell, and water-absorbing and expanding material are simultaneously inserted into the water inrush point and the freezing operation is performed, the freezer body can be removed from the shell. This invention offers the advantages of rapid freezing and sealing of water inrush points, significant freezing effect, fast sealing speed, and improved freezing efficiency through the combination of sealing and freezing technologies.

Description

Technical Field

[0001] This invention belongs to the field of underground engineering freezing construction technology, and more specifically, it relates to a portable liquid nitrogen freezer water sealing device. Background Technology

[0002] With the continuous development of urbanization in my country, the demand for underground space is constantly increasing, and my country has now become the country with the largest scale of underground space construction in the world. However, with the increase in underground projects, engineering accidents are also increasing, among which sudden water inrush is the most common. Currently, the main measures for controlling sudden water inrush include freezing and grouting. Conventional freezing involves arranging freezing pipes in the soil, generating a refrigerant, and circulating the refrigerant in the freezing pipes to freeze the soil. Frozen soil formed by freezing has a good water-stopping effect, and the frozen soil also has a certain strength. In addition, in order to improve the freezing rate, some scholars have proposed the liquid nitrogen freezing method. Liquid nitrogen freezing involves introducing liquid nitrogen into a freezing device. Liquid nitrogen has a boiling point of -196℃ and rapidly transforms into a gaseous state at room temperature. This process absorbs a large amount of heat, causing the surrounding soil to rapidly drop to the freezing temperature, forming frozen soil. This cooling method falls under the category of physical change. Compared with traditional freezing methods, liquid nitrogen freezing has advantages such as fast freezing speed, high freezing strength, simple freezing system, and no pollution. Therefore, liquid nitrogen freezing has been widely used in practical engineering.

[0003] Liquid nitrogen freezing differs from traditional freezing methods in that it does not require the circulation of cryogenic brine. Instead, it removes a significant amount of heat solely through the phase changes of liquid nitrogen. Therefore, the core issue lies in the construction of the freezer. The freezer must ensure both the vaporization of liquid nitrogen and the rapid and uniform heat absorption during vaporization. However, when using liquid nitrogen freezing to seal sudden water inflows, the high-speed water flow significantly impacts the freezing effect, especially in projects with large water inflows. The time required for liquid nitrogen freezing increases substantially. Consequently, in some projects with large water inflows, traditional liquid nitrogen freezers are insufficient for achieving rapid freezing and sealing of the inflow points. Summary of the Invention

[0004] The purpose of this invention is to provide a portable liquid nitrogen freezer water sealing device, which aims to solve the technical problem that traditional liquid nitrogen freezers are unable to quickly freeze and seal water inflow points.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a portable liquid nitrogen freezer water sealing device, comprising:

[0006] The freezer body is used to be inserted into the surge point and freeze the surrounding soil layer. One end of the body inserted into the surge point is defined as the front end and the other end is the rear end. The rear end is used to be connected to a liquid nitrogen storage tank through a pipeline. The liquid nitrogen storage tank is used to deliver liquid nitrogen into the freezer body.

[0007] The outer shell has an internal cavity adapted to accommodate the middle and front ends of the freezer body. The middle and front ends of the freezer body are inserted into the cavity of the outer shell from one end. The outer shell surrounds the middle and front ends of the freezer body.

[0008] A water-absorbing and expanding material is wrapped around the outer wall of the shell. The water-absorbing and expanding material is suitable for absorbing water at the sudden inrush point and expanding after absorbing water to seal the gap between the shell and the surrounding soil to achieve preliminary physical sealing.

[0009] Specifically, after the freezer body, the outer shell, and the water-absorbing and expanding material are simultaneously inserted into the surge point and the freezing operation is carried out, the freezer body can be removed from inside the outer shell.

[0010] In one possible implementation, the freezer body has two protruding fixed sliders on its two opposite sidewalls near its front end. The inner sidewall of the outer shell has a longitudinal slide rail that matches and slides with the fixed sliders. The length direction of the longitudinal slide rail is parallel to the axial direction of the outer shell. After the fixed slider matches and slides with the longitudinal slide rail, it pushes the freezer body to slide into the inner shell.

[0011] In one possible implementation, the longitudinal slide extends from one end of the housing near the rear end to a position of the housing near the front end.

[0012] In one possible implementation, a transverse slide is provided on the outer shell near the front end of the freezer body. One end of the transverse slide is connected to the end of the longitudinal slide near the front end of the freezer body. When the fixed slider slides into the longitudinal slide and is placed at the position connected to the transverse slide, the freezer body is rotated to make the fixed slider slide into the transverse slide, thereby limiting the movement of the freezer body along its axial direction.

[0013] In one possible implementation, the outer shell has an opening at one end near the rear end of the freezer body, through which the freezer body is inserted into the outer shell, and the shape of the outer shell matches the shape of the middle and front ends of the freezer body.

[0014] In one possible implementation, a grouting hole is provided at one end of the outer shell near the front end of the freezer body. The grouting hole penetrates the inside and outside of the outer shell. After the freezer body is removed, grout is injected into the inside of the outer shell. The grout flows through the grouting hole into the inrush point to permanently reinforce the soil layer.

[0015] In one possible implementation, the grouting hole is connected to a one-way valve via a thread. During grouting, the one-way valve is used to allow the grout to pass through and be injected into the surge point, while preventing the surge water and grout from flowing into the interior of the outer shell.

[0016] In one possible implementation, the water-absorbing and swelling material is configured as at least three layers.

[0017] In one possible implementation, the freezer body includes:

[0018] The freezing tube has an internal chamber for containing liquid nitrogen, one end has a conical structure, the other end has a liquid inlet, and an exhaust port is provided on the side of the freezing tube near the liquid inlet.

[0019] An inlet pipe is provided, passing through the inlet port. The inner end of the inlet pipe is close to the front end of the freezing pipe but does not contact the freezing pipe. The outer end of the inlet pipe is used to connect to the liquid nitrogen storage tank through a pipeline.

[0020] A welding handle is welded to the side of the freezing tube near the liquid inlet, and the welding handle is used for hand holding.

[0021] In one possible implementation, the water absorption rate of the water-absorbing and swelling material is 50-70 ml / g.

[0022] The beneficial effects of the portable liquid nitrogen freezer water sealing device provided by the present invention are as follows: Compared with the prior art, the portable liquid nitrogen freezer water sealing device of the present invention includes a freezer body, a shell, and a water-absorbing and expanding material. The freezer body is a liquid nitrogen freezer, which can perform freezing construction on the surrounding soil layer. A shell is set around the freezer body, and the freezer body is inserted into the shell, forming a enclosure around the freezer body. A water-absorbing and expanding material is set on the outer wall of the shell, which can absorb water in the sudden water inrush point and expand after absorbing water to seal the gap between the shell and the surrounding soil and freeze the water inrush point. After the freezer body, the shell, and the water-absorbing and expanding material are inserted into the sudden water inrush point and the freezing operation is carried out, the freezer body can be taken out from the shell. It has the technical effect of being able to freeze and seal the water inrush point quickly, with a significant freezing effect, fast sealing speed, and improved freezing efficiency by combining sealing and freezing technologies. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a portable liquid nitrogen freezer water sealing device provided in an embodiment of the present invention;

[0025] Figure 2 A cross-sectional view of a portable liquid nitrogen freezer water sealing device provided in an embodiment of the present invention;

[0026] Figure 3 A three-dimensional structural schematic diagram of a portable liquid nitrogen freezer water sealing device provided in an embodiment of the present invention;

[0027] Figure 4 for Figure 2 A schematic diagram of the lower structure;

[0028] Figure 5 for Figure 2 Another schematic diagram of the state.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Freezer body; 11. Freezing tube; 111. Chamber; 112. Conical structure; 113. Liquid inlet; 114. Exhaust port; 12. Liquid inlet pipe; 13. Welded handle; 2. Outer shell; 3. Water-absorbing and expanding material; 4. Fixed slider; 5. Longitudinal slide; 6. Transverse slide; 7. Grouting hole; 8. One-way valve. Detailed Implementation

[0031] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] Please refer to the following: Figures 1 to 5The present invention will now describe a portable liquid nitrogen freezer water sealing device. The portable liquid nitrogen freezer water sealing device includes a freezer body 1, an outer shell 2, and a water-absorbing and expanding material 3. The freezer body 1 is used to insert into the surge point and freeze the surrounding soil layer. One end inserted into the surge point is defined as the front end, and the other end is defined as the rear end. The rear end is used to connect to a liquid nitrogen storage tank (existing technology, not shown in the figure) through a pipeline. The liquid nitrogen storage tank is used to transport liquid nitrogen into the freezer body 1. The outer shell 2 forms a chamber suitable for accommodating the middle and front ends of the freezer body 1. The middle and front ends of the freezer body 1 are inserted into the chamber of the outer shell 2 from one end, and the outer shell 2 surrounds the middle and front ends of the freezer body 1. The water-absorbing and expanding material 3 is wrapped around the outer wall of the outer shell 2. The water-absorbing and expanding material 3 is suitable for absorbing water in the surge point and expanding after absorbing water to seal the gap between the outer shell 2 and the surrounding soil to achieve preliminary physical sealing. After the freezer body 1, outer shell 2, and water-absorbing and expanding material 3 are inserted into the surge point at the same time and the freezing operation is carried out, the freezer body 1 can be removed from the outer shell 2.

[0033] This invention provides a portable liquid nitrogen freezer water sealing device. Compared with the prior art, the freezer body 1 is a liquid nitrogen freezer, which can freeze the surrounding soil layer. An outer shell 2 is set around the freezer body 1. The freezer body 1 is inserted into the outer shell 2, and the outer shell 2 forms a surrounding of the freezer body 1. A water-absorbing and expanding material 3 is set on the outer wall of the outer shell 2, which can absorb water in the sudden water inrush point and expand after absorbing water to seal the gap between the outer shell 2 and the surrounding soil to achieve preliminary physical sealing. After the freezer body 1, outer shell 2 and water-absorbing and expanding material 3 are inserted into the sudden water inrush point and the freezing operation is carried out, the freezer body 1 can be taken out from the outer shell 2. It has the technical effect of quickly freezing and sealing the water inrush point, with significant freezing effect, fast sealing speed, and improved freezing efficiency by combining sealing and freezing technologies.

[0034] The principle of this invention is primarily based on sealing, supplemented by freezing. Its main feature is the use of a construction process combining a water-absorbing and expanding material 3 with the freezing device body 1. The water-absorbing and expanding material 3 expands upon contact with water, forming a large amount of gel, which can seal the internal space or gaps at the point of sudden inrush to a certain extent, reducing the water-passing voids (gaps) and achieving preliminary physical sealing of the flowing water. The purpose of this invention is to achieve rapid freezing and sealing of sudden water inrushes in underground engineering. After freezing and sealing treatment using this invention, weak points in underground engineering projects can be quickly frozen and blocked. Simultaneously, due to the extremely low freezing temperature, it can effectively freeze and reinforce weak points in the project.

[0035] To ensure that the freezer body 1 can be recycled or reused, in some embodiments, please refer to... Figures 1 to 5The freezer body 1 has two protruding fixed sliders 4 on its two opposite sidewalls near its front end. The inner sidewall of the outer shell 2 has a longitudinal slide rail 5 that slides and matches the fixed sliders 4. The length of the longitudinal slide rail 5 is parallel to the axial direction of the outer shell 2. After the fixed sliders 4 and the longitudinal slide rail 5 are slidably connected, they push the freezer body 1, causing it to slide into the outer shell 2. The freezer body 1 and the outer shell 2 are detachably connected. To achieve this detachable connection, the fixed sliders 4 and the longitudinal slide rail 5 are engaged to achieve a sliding connection between the freezer body 1 and the outer shell 2, thus enabling the detachable connection. Figure 1-3 The middle and upper parts of the outer shell 2 are hollow cylindrical structures. The inner diameter of the cylindrical structure is slightly larger than the outer diameter of the freezer body 1, so that the middle and front ends of the freezer body 1 can be inserted into the inner shell 2. The two are matched and slidably connected. After the two are slidably connected, the outer shell 2 can form a surround of the freezer body 1.

[0036] The longitudinal slide 5 is set on the inner wall of the outer shell 2. The depth direction of the longitudinal slide 5 is along the radial direction of the outer shell 2 and extends outward. The cross-sectional shape of the fixed slider 4 is rectangular, so the cross-sectional shape of the longitudinal slide 5 is also rectangular. The fixed slider 4 slides inside the longitudinal slide 5. By pushing the freezer body 1 to move along its axial direction, it can slide into the inner shell 2, realizing the mutual cooperation and connection between the two.

[0037] Before the freezer body 1 and the outer shell 2 are connected, the fixed slider 4 can be aligned with the longitudinal slide rail 5. That is, after the fixed slider 4 is aligned in the longitudinal extension direction of the longitudinal slide rail 5, the freezer body 1 can be pushed into the outer shell 2.

[0038] In this embodiment, two fixed sliders 4 are arranged symmetrically with the axis of the freezer body 1 as the axis of symmetry. Thus, two longitudinal slides 5 are also arranged inside the outer shell 2. The shape of the lower part (front end) of the freezer body 1 matches the shape of the lower part of the outer shell 2, forming a nested relationship.

[0039] In some embodiments, please refer to Figures 1 to 5 The longitudinal slide 5 extends from one end of the outer shell 2 near the rear end to the other end. Because the middle and upper parts of the outer shell 2 are hollow cylindrical structures, the longitudinal slide 5 is provided on the inner wall of this structure from one end to near the other. When the fixed slider 4 slides to the lower end of the outer shell 2, the outer shell 2 is no longer in contact with the upper end (rear end) of the freezer body 1. The length of the outer shell 2 is slightly less than the length of the freezer body 1.

[0040] To limit or lock the freezer body 1 inside the housing 2, preventing it from slipping out of the housing 2 along its axial direction, and also to facilitate the disassembly and assembly of the housing 2 and the freezer body 1, in some embodiments, please refer to... Figures 1 to 5 A transverse slide 6 is provided near the front end of the freezer body 1 in the outer shell 2. One end of the transverse slide 6 is connected to the end of the longitudinal slide 5 near the front end of the freezer body 1. When the fixed slider 4 slides into the longitudinal slide 5 and is positioned at the connection with the transverse slide 6, the freezer body 1 is rotated to allow the fixed slider 4 to slide into the transverse slide 6, thereby limiting the axial movement of the freezer body 1. Since the outer shell 2 is a hollow cylinder, the transverse slide 6 is arranged along the radial plane of the outer shell 2, and is therefore arc-shaped. The longitudinal slide 5 is parallel to the axial direction of the outer shell 2, and is therefore straight. When the freezer body 1 is placed inside the outer shell 2, rotating the freezer body 1 allows the fixed slider 4 to slide into the transverse slide 6, thus limiting the axial movement of the freezer body 1. That is, after the freezer body 1 is inserted into the bottom of the outer shell 2, rotating it clockwise or counterclockwise by about 90° allows the fixed slider 4 to slide into the transverse slide 6, thereby limiting the axial movement of the freezer body 1.

[0041] Specifically, in this embodiment, the length of the transverse slide 6 is one-quarter of the inner circumference of the outer shell 2, or slightly less than one-quarter. This ensures that the fixed slider 4 will not easily slip off after sliding within the transverse slide 6, leaving room for the fixed slider 4 to slide, thereby ensuring the connection stability between the outer shell 2 and the freezer body 1.

[0042] In some embodiments, please refer to Figures 1 to 5 The outer shell 2 has an opening at one end near the rear end of the freezer body 1. The freezer body 1 is inserted into the outer shell 2 through the opening. The shape of the outer shell 2 matches the shape of the middle and front end of the freezer body 1. In this embodiment, the outer shell 2 includes three parts: a hollow cylindrical structure in the middle and upper part, a conical structure in the middle and lower part, and a hollow cylindrical structure with a smaller diameter in the lower part. These three parts are arranged end to end from top to bottom, and their inner diameter gradually decreases from top to bottom. In this embodiment, the freezer body 1 is inserted into the outer shell 2 from the upper end and then inserted downwards into the outer shell 2. Since the front end (lower part) of the freezer body 1 is conical, the shape of the outer shell 2 matches the shape of the lower part of the freezer body 1, thus achieving the enclosure of the freezer body 1 by the outer shell 2.

[0043] In some embodiments, please refer to Figures 1 to 5The outer shell 2 has a grouting hole 7 at one end near the front end of the freezer body 1. The grouting hole 7 connects the inside and outside of the outer shell 2. After the freezer body 1 is removed, grout is injected into the outer shell 2. The injected grout flows through the grouting hole 7 into the soil at the point of inrush, thus permanently reinforcing the soil layer. The grouting hole 7 is the hollow cylindrical structure at the bottom of the outer shell 2. Grouting operations can be carried out into the soil through this grouting hole 7. The grout can reinforce the soil layer, prevent soil movement, and further improve the reinforcement effect. This embodiment implements a combination of grouting, sealing, and freezing techniques to permanently reinforce the soil or soil layer around the point of inrush.

[0044] In some embodiments, please refer to Figures 1 to 5 The grouting hole 7 is connected to a one-way valve 8 via a thread. During grouting, the one-way valve 8 allows the grout to pass through and be injected into the surge point, while preventing the surge water and grout from flowing into the outer shell 2. In this embodiment, the one-way valve 8 is existing technology, allowing grout to pass through in only one direction, preventing backflow into the outer shell 2, thus preventing grout backflow and leakage, reducing waste, improving the grouting effect, and preventing the surge water from flowing into the outer shell 2. The one-way valve 8 is threaded to the grouting hole 7 and will not detach from the front of the grouting hole 7; all the grout can pass through the one-way valve 8.

[0045] In some embodiments, please refer to Figures 1 to 5 The water-absorbing and swelling material 3 is configured with at least three layers. The water-absorbing and swelling material 3 is a highly absorbent resin swelling material. The main component of this material is low-crosslinked sodium polyacrylate, which has good water absorption. The total time from the start of water absorption to the completion of water absorption is less than 40 seconds. After water absorption and swelling, it will form a large amount of gel, which effectively delays the water flow speed and achieves the purpose of early expansion.

[0046] In some embodiments, please refer to Figures 1 to 5The freezer body 1 includes a freezing tube 11, an inlet tube 12, and a welding handle 13. The freezing tube 11 has a chamber 111 for containing liquid nitrogen, one end has a conical structure 112, and the other end is provided with an inlet 113. An exhaust port 114 is opened on the side of the freezing tube 11 near the inlet 113. The inlet tube 12 is provided through the inlet 113. The inner end of the inlet tube 12 is close to the front end of the freezing tube 11 but does not contact the freezing tube 11. The outer end of the inlet tube 12 is used to connect to the liquid nitrogen storage tank through a pipeline. The welding handle 13 is welded to the side of the freezing tube 11 near the inlet 113. The welding handle 13 is used for holding and makes it easy to insert the freezer body 1 into the burst point. The inner end of the inlet pipe 12 extends directly to the bottom of the freezing pipe 11 without contacting it. The freezing pipe 11 is made of stainless steel to ensure a stable supply of liquid nitrogen to its bottom. The outer end of the inlet pipe 12 connects to the outlet of the liquid nitrogen storage tank via a stainless steel flexible hose (i.e., pipeline). The vent 114 is also connected to a stainless steel flexible hose for venting nitrogen. The outlet of this stainless steel flexible hose is placed at least 5 meters away from workers or in a well-ventilated area to ensure worker safety. The conical structure 112 is designed to facilitate insertion at sudden surge points during construction, enabling freezing and sealing. The inlet pipe 12 and the inlet 113 are sealed together without gaps. The conical structure 112 is conical, with its upper outer diameter matching that of the freezing pipe 11.

[0047] In some embodiments, please refer to Figures 1 to 5 The water absorption rate of the water-absorbing and expanding material 3 is 50-70 ml / g, preferably 60 ml / g. The water-absorbing and expanding material 3 is a core functional component in the liquid nitrogen freezer's water sealing device for achieving gap sealing. Its water absorption rate directly determines the stability and long-term reliability of the sealing effect. Through extensive experimental verification and engineering application testing, the water absorption rate range of this water-absorbing and expanding material 3 has been determined to be 50-70 ml / g, with a preferred value of 60 ml / g.

[0048] From the perspective of the rationality of the parameter range, the lower limit of water absorption rate is set at 50ml / g, which is determined based on the "basic expansion requirement" in the water sealing scenario of liquid nitrogen freezer: During liquid nitrogen freezing operation, the freezer body 1 and the surrounding soil are prone to micro gaps of 0.2-0.5mm due to temperature contraction. A water absorption rate of 50ml / g can ensure that the material can quickly absorb water and generate an expansion of no less than 1.8 times its initial volume after contact with seepage, which is just enough to fill the above-mentioned micro gaps, form an initial sealing barrier, and avoid the residual seepage channel due to insufficient expansion. The upper limit of water absorption rate is set at 70ml / g to avoid the "risk of excessive expansion" - if the water absorption rate exceeds 70ml / g, the material will generate radial expansion stress of more than 8MPa due to excessive volume expansion after absorbing water, which will cause deformation and affect the sealing effect. It will also cause the material itself to become brittle and crack due to internal stress concentration in the low temperature environment (the liquid nitrogen operation temperature is usually -196℃), which will damage the sealing structure. Therefore, the upper limit of 70ml / g can balance the expansion effect and structural safety.

[0049] Choosing 60 ml / g as the preferred water absorption rate is the optimal solution considering "sealing performance, low-temperature stability, and durability": Under a standard environment of 25℃ (simulating the room temperature pretreatment stage), after soaking for 24 hours, the material with a water absorption rate of 60 ml / g exhibits a uniform expansion rate (the expansion amount per hour is stable at 0.12 times the initial volume), without localized bulging, and can form a dense sealing layer; in the -196℃ liquid nitrogen low-temperature cycling test (simulating actual working conditions, repeated cooling and thawing 50 times), the water absorption rate of this material decreases by only 3%. The water absorption rate is 5%-5%, far lower than that of materials with a water absorption rate of 50ml / g (attenuation rate of 8%-10%) and 70ml / g (attenuation rate of 12%-15%). Moreover, the sealing gap ratio after expansion is always controlled below 0.5%, which can block water seepage for a long time. In addition, when the material with a water absorption rate of 60ml / g comes into contact with the surrounding soil, its expansion stress can be controlled at 3-5MPa, which will not damage the surrounding soil and can ensure the contact pressure of the sealing surface (contact pressure ≥2MPa, meeting the requirements of low temperature sealing pressure in the oil pipe specification).

[0050] In this invention, the freezer body 1 can be recycled after being removed from the shell 2.

[0051] When a sudden water inrush occurs in underground engineering, this invention can be inserted into the inrush point. The water-absorbing and expanding material 3 expands and deforms upon contact with water, initially physically sealing the inrush point. Subsequently, liquid nitrogen is introduced into the freezing device body 1 to freeze and seal the inrush point. After freezing and sealing using the freezing method, the freezing device body 1 can be removed from the outer shell 2, and then grouting is performed inside the inrush point using a grouting machine. The grout can reinforce the surrounding soil layer to a certain extent. By using the combination of grouting, freezing, and expansion sealing, the leakage location can be sealed, thereby improving the applicability of this invention. Therefore, it is applicable to sudden water inrushes of different orifice diameters.

[0052] Connect the outlet of the liquid nitrogen storage tank to the inlet 113 of the freezer body 1 using a stainless steel flexible hose, ensuring a tight connection to prevent liquid nitrogen leakage and ensure worker safety. Simultaneously, the vent 114 of the freezer body 1 should also be connected to the stainless steel flexible hose, with the other end of the hose positioned away from workers, ideally in a well-ventilated area. After confirming that all connections between the freezer body 1 and the liquid nitrogen storage tank are complete and leak-free, introduce liquid nitrogen into the freezer body 1 to freeze and seal the damaged area. Throughout the freezing process, monitor the soil temperature and the temperature of the freezer body 1's pipe wall in real time until the designed freezing temperature and wall thickness are reached, at which point freezing stops, and the damaged area is finally treated.

[0053] This invention can quickly freeze and seal up sudden water inrushes in underground engineering projects. After the freezing and sealing treatment of this invention, the weak points of sudden water inrushes in underground engineering projects can be quickly frozen and blocked. At the same time, due to the extremely low freezing temperature, it can play a good role in freezing and reinforcing the weak points in the project.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable liquid nitrogen freezer water containment device, characterized by, The application relates to a freezing device for gushing point, which comprises a freezing device body, an outer shell, water-absorbing and swelling material and a liquid nitrogen storage tank. The freezing device body is inserted into the gushing point and freezes the surrounding soil, and one end of the freezing device body is defined as a front end and the other end is defined as a rear end. The rear end of the freezing device body is connected to the liquid nitrogen storage tank through a pipeline. The outer shell is internally formed with a chamber suitable for accommodating the middle part and the front end of the freezing device body. The middle part and the front end of the freezing device body are inserted into the chamber of the outer shell from one end of the outer shell. The water-absorbing and swelling material is wrapped on the outer wall of the outer shell. The water-absorbing and swelling material is suitable for absorbing water in the gushing point and swelling after absorbing water to achieve primary physical sealing between the outer shell and the surrounding soil. The freezing device body can be taken out from the inner part of the outer shell after the freezing device body, the outer shell and the water-absorbing and swelling material are simultaneously inserted into the gushing point and freezing operation is carried out. The one end of the outer shell near the rear end of the freezing device body is provided with an opening, and the freezing device body is inserted into the inner part of the outer shell from the opening. The shape of the outer shell matches the shape of the middle part and the front end of the freezing device body.

2. A portable liquid nitrogen freezer water containment device as in claim 1, wherein, The one end of the outer shell near the front end of the freezing device body is provided with a grouting hole.

3. A portable liquid nitrogen freezer water containment device as in claim 2, wherein, The grouting hole penetrates the inner part and the outer part of the outer shell.

4. A portable liquid nitrogen freezer water containment device as in claim 2, wherein, After the freezing device body is taken out, the grouting slurry is injected into the inner part of the outer shell.

5. A portable liquid nitrogen freezer water containment device as in claim 1, wherein, The grouting slurry flows to the inner part of the gushing point through the grouting hole to permanently reinforce the soil. The freezing device body comprises a freezing tube, an inlet tube and a welding handle. The freezing tube is internally provided with a chamber for accommodating liquid nitrogen. One end of the freezing tube is provided with a taper structure, and the other end is provided with an inlet. The side part of the freezing tube near the inlet is provided with an exhaust port. The inlet tube is arranged through the inlet. The inner end of the inlet tube is close to the front end of the freezing tube and does not contact the freezing tube. The outer end of the inlet tube is connected to the liquid nitrogen storage tank through a pipeline. The welding handle is welded to the side part of the freezing tube near the inlet. The two opposite side walls near the front end of the freezing device body are provided with protruding fixed sliding blocks. The inner side wall of the outer shell is provided with longitudinal sliding channels matched with the fixed sliding blocks. The longitudinal sliding channels are parallel to the axial direction of the outer shell. The fixed sliding blocks are matched with the longitudinal sliding channels. The longitudinal sliding channels extend from the one end of the outer shell near the rear end to the position of the outer shell near the front end. The outer shell is provided with a transverse sliding channel near the position of the front end of the freezing device body. The one end of the transverse sliding channel is communicated with the one end of the longitudinal sliding channel near the front end of the freezing device body. When the fixed sliding block is slid into the longitudinal sliding channel and is located at the position communicated with the transverse sliding channel, the freezing device body is rotated to make the fixed sliding block slide into the transverse sliding channel, thereby limiting the movement of the freezing device body along the axial direction. The grouting hole is provided with a one-way valve. When grouting is carried out, the one-way valve allows the grouting slurry to flow into the gushing point and prevents the gushing water and the grouting slurry from flowing into the inner part of the outer shell.

6. A portable liquid nitrogen freezer water containment device as in claim 1, wherein, The water-absorbing and swelling material is provided in at least three layers.

7. A portable liquid nitrogen freezer water containment device as in claim 1, wherein, The water-absorbing and swelling material has a water absorption of 50-70 ml / g.

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