Deep and thick clay freezing pipe connecting structure

Abstract

The utility model relates to the technical field of freezing pipe connection, and provides a deep clay freezing pipe connection structure which comprises an upper freezing pipe and a lower freezing pipe, the two ends of the lining pipe are located in the upper freezing pipe and the lower freezing pipe respectively and abut against the upper freezing pipe and the lower freezing pipe. The two ends of each reinforcing plate are welded to the outer wall of the upper freezing pipe and the outer wall of the lower freezing pipe correspondingly, and the multiple reinforcing plates are circumferentially arranged along the periphery of the lining pipe. By means of the technical scheme, the problem that in the prior art, when the freezing pipe adopts an inner coupling connection mode to face deep and thick clay freezing, the pipe is still prone to being broken is solved.

Description

Technical Field

[0001] This utility model relates to the field of freezing pipe connection technology, specifically to a deep clay freezing pipe connection structure. Background Technology

[0002] In mining operations, mine freezing engineering is of great significance. Its core principle is to use artificial refrigeration to convert water in the strata into ice, thereby constructing an ice curtain. This curtain acts as a solid barrier, effectively isolating the groundwater from the shaft, while also playing a crucial role in temporary support, creating a safe and stable environment for mine construction.

[0003] During the freezing process, low-temperature refrigerant is transported underground through freezing pipes. These freezing pipes act like "cold arteries," penetrating deep into the strata. As the refrigerant circulates, it continuously carries away geothermal heat, causing the strata temperature to drop continuously. The freezing pipes are typically made of low-carbon seamless steel pipes, each about 10 meters long. During installation, pipe clamps are used to connect the steel pipes together, and then they are lowered into the freezing hole until they reach the bottom of the hole, thus ensuring the integrity and effectiveness of the entire freezing system.

[0004] There are two main connection methods for freezing pipes: internal coupling connection and external coupling connection. When the bedrock is frozen, the external coupling connection method is more suitable. However, when the topsoil is frozen, especially the deep clay, the internal coupling connection method is more commonly used. However, based on the actual construction experience of many wells, even when the internal coupling connection method is used for the freezing of deep clay, pipe breakage still occurs, which brings great trouble and safety hazards to the project. Utility Model Content

[0005] This invention proposes a connection structure for frozen pipes in deep clay, which solves the problem that frozen pipes using internal coupling connections are still prone to breakage when facing deep clay freezing.

[0006] The technical solution of this utility model is as follows:

[0007] A deep clay freezing pipe connection structure includes:

[0008] An upper freezing tube and a lower freezing tube, wherein the upper freezing tube and the lower freezing tube are welded together at adjacent ends;

[0009] The inner liner tube has its two ends located inside the upper freezing tube and the lower freezing tube, respectively, and abuts against them;

[0010] Several reinforcing plates are provided, with their two ends welded to the outer walls of the upper freezing pipe and the lower freezing pipe, respectively, and the reinforcing plates are arranged circumferentially around the inner lining pipe.

[0011] As a further technical solution, an annular welding position is formed between the adjacent ends of the upper freezing tube and the lower freezing tube, and the reinforcing plate covers the annular welding position.

[0012] As a further technical solution, the adjacent ends of the upper freezing tube and the lower freezing tube both have annular welding slopes, and the annular welding slopes of the upper freezing tube and the lower freezing tube are symmetrically arranged.

[0013] As a further technical solution, there are three reinforcing plates, and all three reinforcing plates are arc-shaped.

[0014] As a further technical solution, the inner diameters of both the upper and lower freezing pipes are equal to the outer diameter of the inner lining pipe, and the system further includes:

[0015] Several guide blocks are provided on the inner walls of the upper freezing tube and the lower freezing tube, and several guide grooves are correspondingly opened at both ends of the outer wall of the inner liner tube. The guide blocks are located in the guide grooves and correspond one-to-one.

[0016] As a further technical solution, the plurality of guide blocks are arranged circumferentially around the inner liner tube, and the system further includes:

[0017] Several annular wavy protrusions are provided at both ends of the inner liner tube, on the inner wall of the upper freezing tube, and on the inner wall of the lower freezing tube;

[0018] The annular wavy protrusion at one end of the inner liner tube is engaged with the annular wavy protrusion on the inner wall of the upper freezing tube, and the annular wavy protrusion at the other end of the inner liner tube is engaged with the annular wavy protrusion on the inner wall of the lower freezing tube.

[0019] As a further technical solution, the annular wave protrusions are four in number, and the system also includes:

[0020] Two annular support plates are provided on the inner walls of the upper and lower freezing pipes. The annular support plates are fixedly connected to a number of guide blocks. Two annular wavy protrusions are respectively provided on the inner walls of the upper and lower freezing pipes through the annular support plates.

[0021] As a further technical solution, a plurality of the guide blocks are arranged circumferentially around the annular support plate, and the annular wave protrusion is located between the plurality of the guide blocks.

[0022] The working principle and beneficial effects of this utility model are as follows:

[0023] 1. Enhance connection strength:

[0024] The welding connection between the upper and lower freezing pipes ensures the basic stability of the connection. The inner lining further enhances the strength of the connection structure. Its two ends are located inside the upper and lower freezing pipes and abut against each other, providing support for the inner lining and preventing the steel pipe from undergoing local deformation or inward depression when subjected to complex stress. Especially during the freezing process of deep clay, it can resist the lateral pressure of the clay on the freezing pipe.

[0025] Meanwhile, several reinforcing plates arranged circumferentially around the inner lining tube weld and fix the outer walls of the upper and lower freezing tubes at both ends, forming a frame-like structure. These reinforcing plates can effectively disperse stress, enhance the bending resistance of the freezing tube connection parts, and reduce the risk of breakage caused by external forces.

[0026] 2. Improves sealing performance and adapts to the properties of deep clay:

[0027] Welded connections inherently possess good sealing properties, effectively preventing refrigerant leakage. When deep clay freezes, the clay's high viscosity and the resulting friction and lateral pressure on the freezing pipe are significant. This connection structure, through various reinforcement measures, can better adapt to these harsh geological conditions while facilitating early assembly and welding. Attached Figure Description

[0028] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0029] Figure 1 This is a schematic diagram of a deep clay freezing pipe connection structure in this utility model;

[0030] Figure 2 This is a first-view structural diagram of the internal structure of a deep clay freezing pipe connection structure in this utility model;

[0031] Figure 3 This is a schematic diagram of the internal structure of a deep clay freezing pipe connection structure in this utility model from a second perspective.

[0032] Figure 4 This is a schematic diagram of the annular wave protrusion structure in this utility model;

[0033] Figure 5 This is a partial enlarged view of the inner lining tube in this utility model;

[0034] Figure 6 This is a schematic diagram of the internal structure of the lower freezing tube in this utility model.

[0035] In the diagram: 1. Upper freezing pipe, 2. Lower freezing pipe, 3. Inner lining pipe, 4. Reinforcing plate, 5. Annular welding position, 6. Annular welding slope, 7. Guide block, 8. Guide groove, 9. Annular corrugated protrusion, 10. Annular support plate. Detailed Implementation

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0037] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0038] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Reference Figures 1-6 The first embodiment of this utility model proposes a deep clay freezing pipe connection structure, including: an upper freezing pipe 1 and a lower freezing pipe 2, the upper freezing pipe 1 and the lower freezing pipe 2 are welded together at their adjacent ends; an inner liner pipe 3, the two ends of the inner liner pipe 3 are located inside the upper freezing pipe 1 and the lower freezing pipe 2 respectively, and abut against them; and a plurality of reinforcing plates 4, the two ends of the reinforcing plates 4 are welded to the outer walls of the upper freezing pipe 1 and the lower freezing pipe 2 respectively, and the plurality of reinforcing plates 4 are arranged circumferentially around the inner liner pipe 3.

[0041] In this embodiment, the assembly process is as follows:

[0042] First, prepare the components. Conduct a quality inspection of the required upper freezing pipe 1, lower freezing pipe 2, inner liner pipe 3, and reinforcing plate 4 to ensure that each component is free of defects and that its dimensions meet design requirements. Check that the welding equipment is operating normally and prepare welding materials, such as welding rods, ensuring their quality is up to standard. Second, perform preliminary positioning. Accurately place the lower freezing pipe 2 at the predetermined freezing hole position. This process can use specialized positioning clamps or brackets to fix it in place and prevent displacement during subsequent installation. Next, install the inner liner pipe 3. Carefully insert the inner liner pipe 3 into the lower freezing pipe 2, ensuring one end abuts against the top inner wall of the lower freezing pipe 2. During insertion, pay attention to maintaining the verticality of the inner liner pipe 3 to avoid... Scratch the pipe wall and slowly lower the upper freezing pipe 1 to align it with the adjacent end of the lower freezing pipe 2. Then, perform welding using a suitable welding process, such as manual arc welding or gas shielded welding, to weld the adjacent ends of the upper freezing pipe 1 and the lower freezing pipe 2. During welding, follow the welding specifications, first perform tack welding, and then perform continuous welding. After welding, perform visual inspection and necessary non-destructive testing on the weld. Finally, weld the reinforcing plates 4, which are usually in the form of ribs. Weld several reinforcing plates 4 sequentially to the outer walls of the upper freezing pipe 1 and the lower freezing pipe 2, ensuring that they are evenly arranged around the circumference of the inner liner pipe 3 and tightly fitted to the outer walls of the upper and lower freezing pipes 2, and that the weld is firm.

[0043] Compared with traditional methods:

[0044] 1. Traditional internal coupling connection methods are prone to pipe breakage when deep clay freezes. The main reason is that the internal coupling connection relies solely on the connection between the coupling and the steel pipe. When subjected to the huge lateral pressure and complex stress of deep clay, the connection part is relatively weak. However, this connection structure, through the combined effect of welding, inner lining pipe 3 and reinforcing plate 4, greatly enhances the strength and stability of the connection part and effectively reduces the risk of pipe breakage.

[0045] 2. Compared with the external coupling connection method, this structure is more suitable for deep clay freezing scenarios. Although the external coupling connection has certain advantages in bedrock freezing, in deep clay, due to the structural feature of synchronous internal and external welding and fixing, this structure can better adapt to the high pressure and high friction environment when deep clay is frozen, improve the service life and reliability of the freezing pipe, and reduce project delays and maintenance costs caused by freezing pipe failure.

[0046] Material selection:

[0047] For the upper freezing pipe 1 and the lower freezing pipe 2, low-carbon seamless steel pipes, such as Q345B low-carbon alloy steel seamless steel pipes, are usually selected. This material has good strength and toughness, can withstand the pressure of low-temperature refrigerant and the force of the stratum, and its low carbon content ensures good weldability, making it easy to perform welding connections on the construction site.

[0048] For the inner liner 3, a steel pipe of the same material as the freezing pipe or with higher strength and corrosion resistance, such as Q390 seamless steel pipe, can be used. The length of the inner liner 3 is usually much shorter than that of the upper and lower freezing pipes 2. The inner liner 3 needs to remain stable under long-term low-temperature refrigerant environment and under the pressure of the upper and lower freezing pipes 2. The high strength of Q390 steel pipe can meet this requirement.

[0049] For the reinforcing plate 4, ordinary carbon structural steel Q235B steel plate is generally selected. It has certain strength and good welding performance, which can effectively connect the upper freezing pipe 1 and the lower freezing pipe 2, disperse stress, reduce cost, and will not significantly increase the volume of the entire connection structure.

[0050] Furthermore, an annular welding position 5 is formed between the adjacent ends of the upper freezing tube 1 and the lower freezing tube 2, and the reinforcing plate 4 covers the annular welding position 5.

[0051] In this embodiment, firstly, the design of the reinforcing plate 4 covering the annular welding position 5 provides additional mechanical protection for the welding area. In mine freezing projects, the freezing pipe may be affected by various factors such as ground movement, refrigerant pressure fluctuations, and friction with the surrounding medium, reducing the possibility of cracks or damage to the welding point due to external forces. Secondly, while the annular welding improves the overall integrity, the reinforcing plate 4 also reinforces the upper and lower freezing pipes 2 from the outer wall, ensuring that under various complex working conditions, all components can jointly withstand external forces and maintain the reliability of the freezing pipe connection.

[0052] During the actual welding process, some details need to be noted: Pre-treatment of the annular welding position 5, such as removing oil, rust, scale, and other impurities; checking the butt joint accuracy of the upper freezing pipe 1 and the lower freezing pipe 2 to ensure their axes coincide and the gap of the annular welding position 5 is uniform; employing a multi-layer, multi-pass welding process, first performing the root pass welding, ensuring the electrode angle is correct so that the arc can stably melt the base material and electrode, forming a good root weld; during the filler weld, the current can be appropriately increased to make the weld surface smooth and even; finally, visual inspection and non-destructive testing are performed.

[0053] Furthermore, both the upper freezing tube 1 and the lower freezing tube 2 have annular welding bevels 6 at their adjacent ends, and the annular welding bevels 6 of the upper freezing tube 1 and the annular welding bevels 6 of the lower freezing tube 2 are symmetrically arranged.

[0054] In this embodiment, the annular welding bevel 6 at the adjacent ends significantly increases the welding contact area compared to ordinary butt welding. A larger contact area means that the weld metal can better fuse with the base material, effectively improving the strength of the weld joint and reducing the risk of pipe breakage due to weak weld areas. When the frozen pipe is subjected to complex external forces such as lateral pressure and vertical friction from deep clay, traditional butt welds are prone to cracking and deformation at stress concentration points. The annular welding bevel 6, however, allows stress to be gradually dispersed along the bevel, avoiding stress concentration.

[0055] Specifically, the angle between the generatrix of the inclined plane and the horizontal line can be 60°. This angle makes it easier for the welding rod to reach the root of the welding position, maintaining a suitable welding arc length and angle. From a mechanical point of view, the 60° inclined plane design makes the stress distribution of the weld metal more reasonable during the solidification and cooling process. This angle matches the thermal expansion and contraction characteristics of metal, reducing the situation of excessive residual stress caused by cooling contraction, and avoiding cracking of the weld or base material due to the accumulation of residual stress. The 60° annular welding inclined plane also helps to form a stable molten pool, which is less likely to flow out of control on this inclined plane.

[0056] Furthermore, there are three reinforcing plates 4, all of which are arc-shaped.

[0057] In this embodiment, three arc-shaped reinforcing plates 4 are arranged at 120° intervals to disperse stress, stabilize the deep clay freezing pipe, and control costs.

[0058] Furthermore, the inner diameters of the upper freezing pipe 1 and the lower freezing pipe 2 are equal to the outer diameter of the inner lining pipe 3. It also includes several guide blocks 7. The inner walls of the upper freezing pipe 1 and the lower freezing pipe 2 are both provided with guide blocks 7, and several guide grooves 8 are correspondingly opened at both ends of the outer wall of the inner lining pipe 3. The guide blocks 7 are located in the guide grooves 8 and correspond one-to-one.

[0059] In this embodiment, the cooperation between the guide block 7 and the guide groove 8 provides precise guidance for the insertion of the inner liner 3 into the upper and lower freezing pipes 2. During assembly, construction personnel can quickly and accurately align the inner liner 3 based on this structure, reducing installation difficulty. Simultaneously, the tight fit between the guide block 7 and the groove ensures a stable connection between the inner liner 3 and the upper and lower freezing pipes 2. When subjected to the immense lateral pressure of deep clay and the impact of refrigerant, this effectively limits the displacement of the inner liner 3, avoids stress concentration points, extends the service life of the freezing pipe connection structure, and ensures long-term reliable operation.

[0060] Initially, several circumferentially arranged guide blocks 7 need to be welded onto the inner walls of the upper and lower freezing pipes 2 respectively, and then guide grooves 8 are opened accordingly to facilitate the smooth operation of subsequent actions.

[0061] Furthermore, several guide blocks 7 are arranged circumferentially around the inner liner tube 3, and also include several annular wavy protrusions 9. The annular wavy protrusions 9 are provided at both ends of the inner liner tube 3, on the inner wall of the upper freezing tube 1, and on the inner wall of the lower freezing tube 2. The annular wavy protrusion 9 at one end of the inner liner tube 3 is engaged with the annular wavy protrusion 9 on the inner wall of the upper freezing tube 1, and the annular wavy protrusion 9 at the other end of the inner liner tube 3 is engaged with the annular wavy protrusion 9 on the inner wall of the lower freezing tube 2.

[0062] In this embodiment, annular wave protrusions 9 are added to the guide block 7 to further restrict the relative movement of the freezing pipe and the inner liner pipe 3. The two sets of annular wave protrusions 9 mesh with each other, forming a mechanical interlocking structure similar to a mortise and tenon joint between the inner liner pipe 3 and the upper and lower freezing pipes 2. When the ground stress, refrigerant pressure and the lateral pressure of the thick clay are applied to the freezing pipe, this meshing connection can greatly hinder the relative displacement between the components. At the same time, the tight meshing of the annular wave protrusions 9 fills the tiny gaps that may originally exist between the inner liner pipe 3 and the inner wall of the freezing pipe. Compared with the smooth inner wall connection, it greatly reduces the refrigerant leakage channels.

[0063] Therefore, the annular wavy protrusion 9 at one end of the inner liner tube 3 is set to engage with the annular wavy protrusion 9 on the inner wall of the upper freezing tube 1, and the annular wavy protrusion 9 at the other end of the inner liner tube 3 is set to engage with the annular wavy protrusion 9 on the inner wall of the lower freezing tube 2. At the same time, from the processing perspective, the annular wavy protrusion 9 can be efficiently formed through processes such as die stamping and rolling, with controllable cost and easy precision assurance. During assembly, the guiding and engaging effect of the protrusions facilitates the rapid and accurate positioning of the inner liner tube 3.

[0064] Furthermore, there are four annular wave protrusions 9, and it also includes two annular support plates 10. The inner walls of the upper freezing pipe 1 and the lower freezing pipe 2 are both provided with annular support plates 10. The annular support plates 10 are fixedly connected to several guide blocks 7. The two annular wave protrusions 9 are respectively provided on the inner walls of the upper freezing pipe 1 and the lower freezing pipe 2 through the annular support plates 10.

[0065] In this embodiment, the guide block 7 and the annular wave protrusion 9 are connected into a whole by the annular support plate 10, which facilitates integral molding and simplifies the assembly steps. At the same time, the guide block 7 works together to disperse stress, enhance the guiding function, and help the annular wave protrusion 9 to engage firmly, restricting the displacement of the inner liner tube 3 in all directions, so that the upper and lower freezing tubes 2 are tightly connected to the inner liner tube 3. From the perspective of mechanical transmission, the annular support plate 10 provides an additional force transmission path, so that the stress can flow more evenly between the components.

[0066] On the inner walls of the upper freezing pipe 1 and the lower freezing pipe 2, annular support plates 10 are concentrically distributed, conforming to the curvature of the pipe wall for precise positioning and installation. Two annular support plates 10 are located at appropriate positions near the pipe end, providing a stable "support platform" for the guide block 7 and the annular corrugated protrusion 9. The four annular corrugated protrusions 9 are arranged in pairs, evenly distributed around the circumference of the inner wall of the pipe with the help of the annular support plates 10, ensuring balanced force. The guide blocks 7 are arranged circumferentially around the inner liner pipe 3, in appropriate quantities, and are firmly welded to the annular support plates 10, providing stable support for the inner liner pipe 3 and ensuring that it does not shift or shake after insertion.

[0067] The annular support plate 10 and the guide block 7 are fixed by welding, with full and continuous welds to ensure connection strength, allowing the guide block 7 to stably support the inner liner pipe 3 and provide precise guidance. The annular corrugated protrusion 9 is either integrally formed with the annular support plate 10 through processes such as stamping and forging, or is later securely assembled onto the annular support plate 10 using strong bonding and riveting methods, ensuring reliable connection and tight engagement of the protrusions to achieve synergistic effects. After assembly, the two ends of the inner liner pipe 3 are stably positioned at the center of the upper and lower freezing pipes 2 by precise engagement with the annular corrugated protrusion 9 and the limiting position of the guide block 7, forming a stable connection structure ready for use in mine freezing operations.

[0068] Furthermore, several guide blocks 7 are arranged circumferentially around the annular support plate 10, and the annular wave protrusion 9 is located between several guide blocks 7.

[0069] In this embodiment, the guide blocks 7 are arranged circumferentially, and several protrusions are located between the guide blocks 7. The annular wave protrusions 9 are cleverly placed between the guide blocks 7, making full use of the limited space inside the pipe and making the structural layout more compact and reasonable. This achieves the functional goals of strengthening the connection and dispersing stress, while avoiding mutual interference between components and excessive space occupation. It is conducive to completing the assembly of frozen pipes in the narrow construction site of the mine, meets the requirements of practical operation on the engineering site, and does not affect the installation of other auxiliary structures, thus ensuring the overall construction progress.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A connection structure for deep clay freezing pipes, characterized in that, include: An upper freezing tube (1) and a lower freezing tube (2) are provided, wherein the upper freezing tube (1) and the lower freezing tube (2) are welded together at their adjacent ends; The inner lining tube (3) has its two ends located inside the upper freezing tube (1) and the lower freezing tube (2) respectively, and abuts against them; Several reinforcing plates (4) are welded at both ends to the outer walls of the upper freezing pipe (1) and the lower freezing pipe (2), and the several reinforcing plates (4) are arranged circumferentially around the inner lining pipe (3).

2. The deep clay freezing pipe connection structure according to claim 1, characterized in that, An annular welding position (5) is formed between the adjacent ends of the upper freezing tube (1) and the lower freezing tube (2), and the reinforcing plate (4) covers the annular welding position (5).

3. The deep clay freezing pipe connection structure according to claim 1, characterized in that, The upper freezing tube (1) and the lower freezing tube (2) each have an annular welding slope (6) at their adjacent ends. The annular welding slope (6) of the upper freezing tube (1) and the annular welding slope (6) of the lower freezing tube (2) are symmetrically arranged.

4. The deep clay freezing pipe connection structure according to claim 1, characterized in that, There are three reinforcing plates (4), and all three reinforcing plates (4) are arc-shaped.

5. The deep clay freezing pipe connection structure according to claim 1, characterized in that, The inner diameters of the upper freezing tube (1) and the lower freezing tube (2) are both equal to the outer diameter of the inner lining tube (3), and the system further includes: Several guide blocks (7) are provided on the inner wall of the upper freezing tube (1) and the inner wall of the lower freezing tube (2), and several guide grooves (8) are opened at both ends of the outer wall of the inner lining tube (3). The guide blocks (7) are located in the guide grooves (8) and correspond one to one.

6. The deep clay freezing pipe connection structure according to claim 5, characterized in that, Several guide blocks (7) are arranged circumferentially around the inner liner tube (3), and the tube further includes: Several annular wavy protrusions (9) are provided at both ends of the inner liner tube (3), on the inner wall of the upper freezing tube (1) and on the inner wall of the lower freezing tube (2). The annular wave protrusion (9) at one end of the inner liner tube (3) is engaged with the annular wave protrusion (9) on the inner wall of the upper freezing tube (1), and the annular wave protrusion (9) at the other end of the inner liner tube (3) is engaged with the annular wave protrusion (9) on the inner wall of the lower freezing tube (2).

7. The deep clay freezing pipe connection structure according to claim 6, characterized in that, The annular wave protrusion (9) consists of four parts, and also includes: Two annular support plates (10) are provided on the inner walls of the upper freezing pipe (1) and the lower freezing pipe (2). The annular support plates (10) are fixedly connected to a number of guide blocks (7). Two annular wave protrusions (9) are respectively provided on the inner walls of the upper freezing pipe (1) and the lower freezing pipe (2) through the annular support plates (10).

8. The deep clay freezing pipe connection structure according to claim 7, characterized in that, Several guide blocks (7) are arranged circumferentially around the annular support plate (10), and the annular wave protrusion (9) is located between several guide blocks (7).

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