Joint assembly for double-wall steel pipe, preparation tool, steel pipe combination column and manufacturing process

Abstract

The invention relates to a joint assembly for a double-wall steel pipe, a preparation tool, a steel pipe combination column and a manufacturing process, and is applied to the field of steel pipe manufacturing. The connecting structure comprises a connecting ring and a reinforcing plate, the connecting ring is used for connecting the double-wall steel pipe to another double-wall steel pipe in the axial direction, and a mounting hole is formed in the connecting ring in the axial direction in a penetrating mode; the reinforcing plate penetrates through the connecting ring through the mounting hole and is connected between the connecting ring and the pipe wall of the double-wall steel pipe. The reinforcing plates penetrate through the mounting holes of the connecting rings and are welded to the pipe wall of the double-wall steel pipe, an axial force transmission path is formed, tension borne by the pipeline is dispersed to the whole connecting rings, and the phenomenon of stress concentration of welding seams is eliminated. A mechanical interlocking structure of the reinforcing plate and the connecting ring directly bears main axial loads, and the ring surface of the connecting ring and the pipe end are fixed in a full-circumference mode, so that the weld joint tension crack failure is thoroughly avoided, and the structural stability is remarkably enhanced.

Description

Technical Field

[0001] This application relates to the technical field of steel pipe manufacturing, and in particular to a joint assembly for double-walled steel pipes, preparation tooling, steel pipe composite columns, and manufacturing process. Background Technology

[0002] Double-walled steel pipe is a pipe structure consisting of a coaxially nested inner and outer pipe, forming an annular cavity between them. The inner pipe is typically made of corrosion-resistant material and is responsible for transporting the medium; the outer pipe is usually made of a high-strength material, providing mechanical protection. This cavity can be filled with appropriate materials based on the specific application scenario to enhance the structural strength or thermal insulation performance of the double-walled steel pipe, thereby effectively addressing the shortcomings of traditional single-walled pipes in terms of poor thermal insulation and insufficient resistance to external damage.

[0003] In related technologies, angle steel flanges are usually used to connect double-walled steel pipes. However, there are significant defects in the weld joint between the angle steel flange and the double-walled steel pipe: due to the insufficient cross-sectional stiffness of the angle steel flange and the stress concentration in the weld area, the connection structure is weak in bearing the axial tensile force of the pipe body. Under the action of thermal expansion of the pipeline or external load, the weld is prone to cracking failure, which seriously restricts the structural stability and construction safety of the pipeline system and urgently needs to be improved. Summary of the Invention

[0004] Therefore, it is necessary to address the problem that the connection structure formed by angle steel flanges is weak in bearing the axial tensile force of the pipe body and is prone to weld cracking failure, and to provide a joint assembly for double-wall steel pipes, preparation tooling, steel pipe composite column and manufacturing process.

[0005] In a first aspect, this application provides a joint assembly for double-walled steel pipes, employing the following technical solution:

[0006] A connector assembly for double-walled steel pipes includes a connecting ring and a reinforcing plate. The connecting ring is used to connect one double-walled steel pipe to another double-walled steel pipe along the axial direction. An axially penetrating mounting hole is provided on the connecting ring. The reinforcing plate passes through the mounting hole and is inserted into the connecting ring, and is connected between the connecting ring and the wall of the double-walled steel pipe.

[0007] In one embodiment, the connecting ring includes a fixing part and a connecting part arranged perpendicularly to each other, the connecting part being coaxially connected to the fixing part along the axial direction, the fixing part being used for connecting double-walled steel pipes, and the connecting part being configured to be axially connected to the connecting part of another connecting ring.

[0008] In one embodiment, multiple reinforcing plates are provided, all of which are distributed at intervals along the circumference of the connecting ring and are used to connect the connecting ring to the double-walled steel pipe.

[0009] In one embodiment, the connecting ring is configured to be formed by bending angle steel.

[0010] In one embodiment, the end of the reinforcing plate opposite to the double-walled steel pipe is provided with a hoisting part, which is used for connecting hoisting equipment.

[0011] Secondly, this application provides a steel pipe composite column, which adopts the following technical solution:

[0012] A steel pipe composite column includes at least two double-walled steel pipes and the aforementioned connector assembly for the double-walled steel pipes. The double-walled steel pipes include an outer pipe and an inner pipe that are axially fitted together, with a filling cavity defined between the outer pipe and the inner pipe for filling a medium. The connector assembly is installed at at least one end of the double-walled steel pipes in the axial direction for connecting two adjacent double-walled steel pipes. A reinforcing plate connects the connecting ring to the inner wall of the outer pipe and / or the outer wall of the inner pipe.

[0013] In one embodiment, the double-walled steel pipe further includes at least one web plate disposed within the filling cavity, all of the web plates being spaced apart along the axial direction of the double-walled steel pipe and connected between the outer pipe and the inner pipe.

[0014] Thirdly, this application provides a manufacturing process comprising the following steps:

[0015] A manufacturing process for producing the aforementioned steel pipe composite column, the manufacturing process comprising:

[0016] Install mounting holes are made on the connecting ring;

[0017] The reinforcing plate is inserted through the double-walled steel pipe and connected to the pipe wall;

[0018] The connecting ring is installed axially onto the double-walled steel pipe and welded to the reinforcing plate for fixation.

[0019] In one embodiment, the method of creating mounting holes on the connecting ring includes:

[0020] The preparation tooling is axially attached to the connecting ring;

[0021] Use the clearance notch on the tooling to scribing lines on the surface of the connecting ring;

[0022] Install mounting holes are made on the connecting ring according to the markings.

[0023] Fourthly, this application provides a preparation tooling, which adopts the following technical solution:

[0024] A preparation tooling for manufacturing the above-mentioned double-walled steel pipe joint assembly, the preparation tooling including a positioning plate and at least one support member, the support member being installed radially within the positioning plate, the positioning plate being configured to abut axially against the connecting ring, the positioning plate having at least one clearance notch through it, the clearance notch being provided one-to-one with the reinforcing plate for marking lines on the connecting ring based on the clearance notch.

[0025] The aforementioned joint assembly for double-walled steel pipes features a reinforcing plate that penetrates the mounting hole of the connecting ring and is welded to the pipe wall, forming an axial force transmission path. This disperses the tensile force on the pipe to the entire connecting ring, eliminating stress concentration in the weld. The mechanical interlocking structure between the reinforcing plate and the connecting ring directly bears the main axial load. Combined with the full circumferential fixation of the connecting ring surface and the pipe end, it completely prevents weld tearing failure and significantly enhances structural stability. Attached Figure Description

[0026] Figure 1 This is a partial sectional view of a steel pipe composite column in the prior art.

[0027] Figure 2 This is a partial sectional view of a steel pipe composite column in one embodiment of this application.

[0028] Figure 3 This is a partial schematic diagram of a joint assembly for double-walled steel pipes in one embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the tooling used in one embodiment of this application.

[0030] Attached image annotations:

[0031] 1. Joint assembly; 11. Connecting ring; 111. Fixing part; 1111. Mounting hole; 112. Connecting part; 12. Reinforcing plate; 121. Lifting part; 2. Double-walled steel pipe; 21. Outer pipe; 22. Inner pipe; 23. Web plate; 3. Filling cavity; 4. Preparation tooling; 41. Positioning plate; 411. Displacement notch; 42. Support component; 5. Angle steel flange; F1. Axial. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] See Figure 1 As shown, Figure 1 A partial sectional view of a steel pipe composite column in the prior art is shown. In the existing double-walled steel pipe 2 structure, there is a significant defect in the joint weld between the angle steel flange 5 (an annular connector formed by bending angle steel) and the double-walled steel pipe 2: due to the insufficient cross-sectional stiffness of the angle steel flange 5 and the stress concentration in the weld area, the connection structure is weak in its ability to withstand the axial tensile force F1 of the pipe body, and is prone to weld cracking failure under the action of pipe thermal expansion or external load.

[0039] Meanwhile, the surface of the double-walled steel pipe lacks a dedicated lifting point structure, requiring temporary clamps to bind the pipe body during installation. This not only results in low operational efficiency but also makes the pipe wall prone to crushing and deformation due to excessive local stress.

[0040] The aforementioned problems severely restrict the structural stability and construction safety of pipeline systems, and urgently require improvement. Therefore, this application proposes a joint assembly for double-walled steel pipes, preparation tooling, a steel pipe composite column, and a manufacturing process to solve the above problems.

[0041] The following is in conjunction with the appendix Figure 2-4 The embodiments of this application will be described in further detail.

[0042] See Figure 2 , Figure 2 A partial cross-sectional view of a steel pipe composite column according to an embodiment of this application is shown. An embodiment of this application provides a steel pipe composite column, comprising at least two double-walled steel pipes 2 axially connected by F1, and a double-walled steel pipe joint assembly 1 for connecting the double-walled steel pipes 2. By means of the connecting action of the joint assembly 1, multiple double-walled steel pipes 2 can be connected to form a steel pipe composite column.

[0043] Specifically, the double-walled steel pipe 2 includes an outer pipe 21 and an inner pipe 22 fitted together along the axial direction F1. The outer pipe 21 and the inner pipe 22 are coaxially arranged, and a filling cavity 3 for filling medium is defined between the inner wall of the outer pipe 21 and the outer wall of the inner pipe 22. A connector assembly 1 is installed at least one end of the double-walled steel pipe 2 along the axial direction F1 for connecting the connector assembly 1 of the double-walled steel pipe 2 to the connector assembly 1 of another double-walled steel pipe 2 to form a steel pipe composite column.

[0044] Depending on the specific application scenario, the medium can be thermal insulation material, inert gas, or concrete. Among these, thermal insulation material or inert gas can significantly reduce heat conduction when used as the filling medium, while concrete can enhance the overall structural strength of the double-walled steel pipe 2.

[0045] This structural design effectively solves the shortcomings of traditional single-walled pipes in terms of poor thermal insulation and insufficient resistance to external damage. It is especially suitable for harsh environments that require simultaneous pressure bearing, thermal insulation and safety monitoring, such as high-temperature steam transportation, long-distance oil and gas pipelines and nuclear industry facilities.

[0046] In some embodiments, the inner tube 22 is typically made of a corrosion-resistant material (such as stainless steel) and is responsible for conveying the medium to be transported, while the outer tube 21 is often made of a high-strength material (such as carbon steel or composite materials) to provide mechanical protection. In the embodiments of this application, both the outer tube 21 and the inner tube 22 can be made of stainless steel.

[0047] Continue reading Figure 2 As shown, in some other embodiments, the double-walled steel pipe 2 also includes at least one web plate 23 installed in the filling cavity 3. In this embodiment, multiple web plates 23 are provided and are evenly distributed along the axial direction F1 of the double-walled steel pipe 2. The web plates 23 are connected between the outer pipe 21 and the inner pipe 22 to form radial support, thereby further improving the structural strength of the double-walled steel pipe 2 and the steel pipe composite column composed of the double-walled steel pipe 2.

[0048] Combination Figure 3 As shown, Figure 3 A partial schematic diagram of a connector assembly for double-walled steel pipes according to an embodiment of this application is shown. In some embodiments, this application provides a connector assembly 1 for double-walled steel pipes as shown in the above embodiment. The connector assembly 1 includes a connecting ring 11 and a reinforcing plate 12. The connecting ring 11 is used to connect a double-walled steel pipe 2 to another double-walled steel pipe 2 along the axial direction F1. The connecting ring 11 has a mounting hole 1111 through it along the axial direction F1 for mounting the reinforcing plate 12. The reinforcing plate 12 can pass through the mounting hole 1111 into the connecting ring 11, and connect the connecting ring 11 to the pipe wall of the double-walled steel pipe 2.

[0049] In this embodiment, the reinforcing plate 12, connecting ring 11, and double-walled steel pipe 2 can be fixedly connected by welding. The reinforcing plate 12 passes through the mounting hole 1111 of the connecting ring 11 and is welded to the wall of the double-walled steel pipe 2, forming an axial F1 force transmission path. This disperses the tensile force on the pipe to the entire connecting ring 11, eliminating stress concentration in the weld. The mechanical interlocking structure of the reinforcing plate 12 and connecting ring 11 directly bears the main axial F1 load. Combined with the full circumferential fixation of the connecting ring 11's annular surface and the pipe end, weld cracking failure is completely avoided, significantly enhancing structural stability.

[0050] Specifically, the connecting ring 11 includes a fixing part 111 and a connecting part 112, which are coaxially arranged and perpendicularly connected to each other. The fixing part 111 is constructed into a ring shape and is used to fit and connect with the end face of the double-walled steel pipe 2. The mounting hole 1111 passes through the fixing part 111 along the axial direction F1. The connecting part 112 is constructed into a cylindrical shape and is used to connect with the connecting part 112 on the adjacent double-walled steel pipe 2 during the assembly process to form a steel pipe composite column.

[0051] In some embodiments, the mounting hole 1111 passes through the inner ring of the fixing part 111 (the position of the fixing part 111 near the connecting part 112) along the axial direction F1. The reinforcing plate 12 passes through the mounting hole 1111 into the filling cavity 3. One side of the reinforcing plate 12 located in the filling cavity 3 is welded to the outer wall of the inner tube 22, the other side is welded to the outer wall of the connecting part 112, and the middle section is welded to the edge of the mounting hole 1111 to form a stable connection structure, thereby improving the axial tensile strength F1 of the double-walled steel pipe joint assembly 1.

[0052] In some other embodiments, the mounting hole 1111 passes through the fixing part 111 near the outer ring along the axial direction F1. One end of the reinforcing plate 12 passes through the mounting hole 1111 along the axial direction F1 into the filling cavity 3. The reinforcing plate 12 is welded to the inner wall of the outer tube 21 on one side inside the filling cavity 3, and the edge of the other side is welded to the edge of the mounting hole 1111 to form a stable connection structure, thereby improving the axial tensile strength of the double-walled steel pipe joint assembly 1.

[0053] In other embodiments, a mounting hole 1111 is provided at the inner ring position and the position adjacent to the outer ring of the fixing part 111, and a reinforcing plate 12 is installed in each mounting hole 1111. Specifically, one side of the reinforcing plate 12 located on the outer ring of the fixing part 111 is inserted into the filling cavity 3 and welded to the inner wall of the outer tube 21, while the other side is welded to the mounting hole 1111 located on the outer side. One side of the reinforcing plate 12 located on the inner ring of the fixing part 111 is inserted into the filling cavity 3 and welded to the outer wall of the inner tube 22, while the other side is attached to and welded to the outer wall of the connecting part 112, with its middle position welded to the mounting hole 1111 located on the inner side. In this embodiment, by connecting reinforcing plates 12 to both the inner and outer pipe fittings of the double-walled steel pipe 2, the axial tensile strength F1 of the double-walled steel pipe joint assembly 1 is further improved.

[0054] In some embodiments, the connecting portion 112 and the fixing portion 111 are constructed as an integral structure to ensure the overall structural strength of the connecting ring 11, thereby improving the axial tensile strength F1 of the double-walled steel pipe joint assembly 1. Specifically, the connecting ring 11 can be made of angle steel through bending. Using existing components to manufacture the connecting ring 11 helps to reduce production costs and reduce production input while ensuring quality.

[0055] In some other embodiments, multiple reinforcing plates 12 are provided, and all reinforcing plates 12 are evenly distributed along the circumference of the connecting ring 11 to strengthen the axial F1 connection strength between the connecting ring 11 and the double-walled steel pipe 2, thereby further improving the overall axial F1 tensile strength of the steel pipe composite column.

[0056] Continue reading Figure 2 As shown, in some embodiments, the end of the reinforcing plate 12 facing away from the double-walled steel pipe 2 is provided with a lifting part 121. The lifting part 121 is used to provide a lifting point position for the lifting equipment so as to lift the double-walled steel pipe 2. In this embodiment, the lifting part 121 is a lifting hole opened at the end of the reinforcing plate 12 away from the double-walled steel pipe 2. In other embodiments, the lifting part 121 may also be a lifting hook or lifting ring welded to the end of the reinforcing plate 12 away from the double-walled steel pipe 2, as long as it can be connected to the lifting equipment, and this application does not limit this.

[0057] Combination Figure 4 As shown, Figure 4 A schematic diagram of the preparation tooling in one embodiment of this application is shown. In some embodiments, this application also provides a preparation tooling 4 for manufacturing a double-walled steel pipe connector assembly 1 as shown in any of the above embodiments. The preparation tooling 4 includes a positioning plate 41 that can abut against the connecting ring 11 along the axial direction F1. During use, the positioning plate 41 and the fixing part 111 of the connecting ring 11 are coaxially arranged and fit together.

[0058] Specifically, at least one clearance notch 411 is provided through the positioning plate 41. All clearance notches 411 are evenly distributed along the circumference of the positioning plate 41 and are set one-to-one with the mounting holes 1111, so that the positioning operation of the opening position of the mounting holes 1111 can be realized by using the clearance notch 411 of the preparation tool 4 during the manufacturing process.

[0059] In this embodiment, the clearance notch 411 is constructed as an open hole to facilitate the snap-fit ​​fixing with the reinforcing plate 12, thereby achieving temporary relative fixation between the reinforcing plate 12 and the preparation tooling 4, which facilitates the welding operation between the reinforcing plate 12 and the double-walled steel pipe 2.

[0060] Furthermore, in some other embodiments, the preparation tooling 4 also includes at least one support member 42 disposed in the positioning plate 41. The support member 42 is installed in the positioning plate 41 radially and is evenly distributed along the circumference of the positioning plate 41 to achieve radial support of the positioning plate 41, so that the positioning plate 41 always maintains a stable circular structure.

[0061] In other embodiments, this application also provides a manufacturing process for fabricating steel pipe composite columns as shown in any of the above embodiments using a fabrication fixture 4. This manufacturing process specifically includes the following steps:

[0062] Step S1: Make mounting holes 1111 on the connecting ring 11;

[0063] Step S2: The reinforcing plate 12 is inserted through the double-walled steel pipe 2 and connected to the pipe wall of the double-walled steel pipe 2;

[0064] Step S3: Install the connecting ring 11 along the axial direction F1 onto the double-walled steel pipe 2 and weld it to the reinforcing plate 12 for fixation.

[0065] Specifically, step S1 above includes the following steps:

[0066] Step S11: Place the preparation tooling 4 against the connecting ring 11 along the axial direction F1;

[0067] Step S12: Use the clearance notch 411 on the tooling 4 to scribble lines on the surface of the connecting ring 11;

[0068] Step S13: Drill mounting holes 1111 on the connecting ring 11 according to the markings.

[0069] Specifically, in step S11, the preparation tool 4 is placed against the connecting ring 11 along the axial direction F1, so that the end face of the positioning plate 41 of the preparation tool 4 is in contact with the end face of the connecting ring 11, and the relative position between the positioning plate 41 and the connecting ring 11 is temporarily fixed so as to perform subsequent positioning operations.

[0070] In step S12, after the relative position between the positioning plate 41 and the connecting ring 11 is temporarily fixed, a line is drawn on the fixing part 111 of the connecting ring 11 using the clearance notch 411 on the positioning plate 41 of the preparation tool 4, thereby locating the opening position of the mounting hole 1111 on the fixing part 111. Then, the positioning plate 41 is removed from the connecting ring 11 to facilitate the subsequent hole-opening operation. The drawing can be done with the help of auxiliary tools such as pencils or ink lines, and this application does not limit this.

[0071] In step S13, according to the scribing marks, a mounting hole 1111 is made on the fixing part 111 along the axial direction F1. The position of the mounting hole 1111 is consistent with the position of the clearance notch 411 on the preparation tooling 4, and the size of the mounting hole 1111 matches the cross section of the reinforcing plate 12.

[0072] In step S2, the reinforcing plate 12 is inserted into the clearance notch 411 on the preparation fixture 4 along the axial direction F1, and the reinforcing plate 12 is temporarily fixed together with the preparation fixture 4. Then, the preparation fixture 4 together with the reinforcing plate 12 temporarily fixed on the preparation fixture 4 is placed against the end of the double-walled steel pipe 2, and one end of the reinforcing plate 12 is inserted into the filling cavity 3 of the double-walled steel pipe 2 to complete the welding with the inner wall of the double-walled steel pipe 2.

[0073] In step S3, after the reinforcing plate 12 is welded and fixed to the inner wall of the double-walled steel pipe 2, the preparation fixture 4 is removed. Then, the connecting ring 11 is mated to the end position of the double-walled steel pipe 2, and during the mating process, the reinforcing plate 12 is passed through the corresponding mounting hole 1111 on the connecting ring 11, so that the connecting ring 11 and the end face of the double-walled steel pipe 2 are in contact. Then, the joint between the end face of the connecting ring 11 and the end face of the double-walled steel pipe 2 is welded, specifically including the inner wall joint and the outer wall joint. Finally, the weld between the reinforcing plate 12 and the connecting part 112 is welded, and the reinforcing plate 12 is welded and fixed to the periphery of the mounting hole 1111.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A joint assembly for double-walled steel pipes, characterized in that, The connector assembly includes: A connecting ring, used to connect a double-walled steel pipe axially to another double-walled steel pipe, wherein the connecting ring is provided with a mounting hole extending axially; and The reinforcing plate passes through the mounting hole into the connecting ring and is connected between the connecting ring and the wall of the double-walled steel pipe.

2. The joint assembly for double-walled steel pipes according to claim 1, characterized in that, The connecting ring includes a fixing part and a connecting part arranged perpendicularly to each other. The connecting part is coaxially connected to the fixing part along the axial direction. The fixing part is used for connecting double-walled steel pipes. The connecting part is configured to be axially connected to the connecting part of another connecting ring.

3. The joint assembly for double-walled steel pipes according to claim 1, characterized in that, Multiple reinforcing plates are provided, and all of the reinforcing plates are distributed at intervals along the circumference of the connecting ring, and are used to connect the connecting ring to the double-walled steel pipe.

4. The joint assembly for double-walled steel pipes according to any one of claims 1 or 2, characterized in that, The connecting ring is configured to be formed by bending angle steel.

5. The joint assembly for double-walled steel pipes according to claim 1, characterized in that, The reinforcing plate has a hoisting part at the end opposite to the double-walled steel pipe, which is used for connecting hoisting equipment.

6. A steel pipe composite column, characterized in that, The steel pipe composite column includes: At least two double-walled steel pipes, each comprising an outer pipe and an inner pipe axially fitted together, the outer and inner pipes defining a filling cavity for filling a medium; and, The connector assembly for double-walled steel pipes as described in any one of claims 1-5, wherein the connector assembly is installed at at least one end of the double-walled steel pipe in the axial direction for connecting two adjacent double-walled steel pipes, and the reinforcing plate connects the connecting ring to the inner wall of the outer pipe and / or the outer wall of the inner pipe.

7. The steel pipe composite column according to claim 6, characterized in that, The double-walled steel pipe also includes at least one web plate disposed in the filling cavity, and all of the web plates are arranged at intervals along the axial direction of the double-walled steel pipe and connected between the outer pipe and the inner pipe.

8. A manufacturing process for producing a steel pipe composite column as described in any one of claims 6-7, characterized in that, The manufacturing process includes: Install mounting holes are made on the connecting ring; The reinforcing plate is inserted through the double-walled steel pipe and connected to the pipe wall; The connecting ring is installed axially onto the double-walled steel pipe and welded to the reinforcing plate for fixation.

9. The manufacturing process according to claim 8, characterized in that, The aforementioned method of creating mounting holes on the connecting ring includes: The preparation tooling is axially attached to the connecting ring; Use the clearance notch on the tooling to scribing lines on the surface of the connecting ring; Install mounting holes are made on the connecting ring according to the markings.

10. A manufacturing tooling for fabricating a joint assembly for double-walled steel pipes as described in any one of claims 1-5, characterized in that, The preparation fixture includes a positioning plate and at least one support member. The support member is installed radially within the positioning plate. The positioning plate is configured to abut against the connecting ring axially. At least one clearance notch is provided through the positioning plate. The clearance notch corresponds to the reinforcing plate and is used to mark a line on the connecting ring based on the clearance notch.

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