Round steel pipe splicing joint based on double-end left-hand thread combined tapping bushing

Abstract

The invention relates to a round steel pipe splicing joint based on a double-end left-hand thread combined tapping bushing, comprising: a double-end left-hand thread bushing comprising a middle section, and an upper side screw and a lower side screw arranged at two ends of the middle section, the upper side screw and the lower side screw being respectively provided with external threads with opposite screwing directions; the two internal thread connecting pipes are arranged on the upper side and the lower side of the double-end left-hand thread liner pipe respectively, internal threads matched with the external threads of the screws at the two ends of the double-end left-hand thread liner pipe are arranged on the inner side pipe walls of the internal thread connecting pipes, and chamfers are arranged on the outer sides of the internal thread connecting pipes; and the internal thread connecting pipe is fixedly connected with the end part of the circular steel pipe through a welding seam. Compared with the prior art, the device has the advantages of being compact and attractive in structure, clear and efficient in force transmission, convenient to construct and disassemble, wide in application prospect and the like.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology in building engineering, and in particular to a round steel pipe splicing node based on a double-headed reverse thread combined tapping bushing. Background Technology

[0002] Circular steel tubes are widely used in modern building structures due to their excellent mechanical properties, smooth cross-sectional shape, and good architectural expressiveness. With the increasing popularity of prefabricated construction and dismantling / recycling concepts, efficient, reliable, aesthetically pleasing, and reversible connections between circular steel tubes have become crucial. An ideal circular steel tube joint should possess characteristics such as clearly defined stress distribution, convenient construction, compact shape, disassembly capability, and preservation of the building's visual appeal.

[0003] Currently, the on-site splicing of round steel pipes mainly adopts two methods: flange end plate connection and bevel welding. (1) Flange end plate type nodes are connected by welding flanges to the ends of steel pipes and using high-strength bolts. Although this connection method is reliable in terms of force transmission, the flange size is usually significantly larger than the diameter of the steel pipe, and its protruding part will destroy the smooth outline of the round steel pipe, which will have an adverse effect on the overall aesthetic effect of the structure. (2) Bevel welding type nodes are connected by processing bevels at the ends of steel pipes and performing full penetration welding. Although this method can ensure the continuity and rigidity of the node, it requires a very high level of welding skills, the on-site welding workload is large, the construction quality is seriously constrained by weather and environmental factors, the cycle is long, and it is a permanent connection, which is not convenient for later maintenance, modification and disassembly and recycling.

[0004] In summary, existing methods for splicing circular steel pipes have significant limitations in terms of aesthetics, construction efficiency, disassembly, and quality control. Therefore, developing a new type of circular steel pipe splicing joint that can balance structural performance, construction convenience, and architectural aesthetics is particularly urgent. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, this invention provides a circular steel pipe splicing joint based on a double-ended reverse thread combined tapping bushing. Its structure is compact and aesthetically pleasing, with clear and efficient force transmission, convenient construction and disassembly, and broad application prospects.

[0006] The objective of this invention is achieved through the following technical solution: This invention provides a round steel pipe splicing node based on a double-ended reverse thread combined tapping bushing, comprising: A double-ended reverse threaded bushing includes a middle section and an upper threaded rod and a lower threaded rod located at both ends of the middle section. The upper threaded rod and the lower threaded rod are respectively provided with external threads in opposite directions. Two internally threaded connecting pipes are respectively located on the upper and lower sides of the double-ended reverse threaded liner. The inner wall of the internally threaded connecting pipe is provided with an internal thread that matches the external thread of the screw at both ends of the double-ended reverse threaded liner, and the outer side is provided with a chamfer. The internally threaded connecting pipe is fixedly connected to the end of the round steel pipe by a weld.

[0007] Furthermore, the shape of the internally threaded connecting pipe matches the shape of the inner wall of the round steel pipe, and the outer diameter of the internally threaded connecting pipe matches the inner diameter of the round steel pipe.

[0008] Furthermore, the cross-section of the middle section is hexagonal, which facilitates the use of standard tools for screwing and tightening during construction.

[0009] Furthermore, the internally threaded connecting pipe includes a hollow cylindrical block.

[0010] Furthermore, the lengths of the upper and lower screws are matched with the internal thread depth of the internal thread connecting pipe.

[0011] Furthermore, the chamfer is located on the outer side of the internally threaded connecting pipe at the end away from the double-ended reverse threaded liner.

[0012] Furthermore, the internal thread of the internal threaded connecting pipe is coaxial with the axis of the round steel pipe to ensure that the force transmission path is along the axial direction.

[0013] Furthermore, the opposite side dimension of the hexagonal cross-section in the middle section of the double-ended reverse-threaded bushing is larger than the outer diameter of the upper and lower threaded rods. This provides sufficient torsional resistance to withstand the tightening torque during construction.

[0014] Furthermore, the axial length of the node does not exceed 10cm.

[0015] Furthermore, the tensile force is transmitted through the thread between the double-ended reverse threaded liner and the internally threaded connecting pipe, the pressure is transmitted through the extrusion surface between the middle section of the double-ended reverse threaded liner and the internally threaded connecting pipe, and the shear force is transmitted through the thick wall of the double-ended reverse threaded liner.

[0016] Compared with the prior art, the present invention has the following advantages: (1) Compact and aesthetically pleasing structure. All connecting components (double-ended reverse threaded liner and internal threaded connecting pipe) are built into the round steel pipe, with no components protruding outward in the cross-sectional direction of the steel pipe, thus maintaining the smooth appearance of the round steel pipe and not compromising the aesthetic effect of the structure. In the axial direction of the steel pipe, the node length can be approximately estimated as twice the thickness of the internal threaded connecting pipe plus the hexagonal height of the middle section of the double-ended reverse threaded liner, not exceeding 10cm, resulting in an efficient and compact structural layout.

[0017] (2) Clear and efficient force transmission. Tensile force transmission: The tensile force inside the steel pipe is reliably transmitted through the threaded engagement between the double-ended reverse threaded liner and the internally threaded connecting pipe. Compression force transmission: The pressure inside the steel pipe is transmitted through the extrusion surface between the middle section of the double-ended reverse threaded liner and the internally threaded connecting pipe. Shear force transmission: The shear force between the upper and lower steel pipes is effectively transmitted through the thick wall of the double-ended reverse threaded liner. The entire connection assembly can form asynchronous tensile and compressive stress states at different parts of the cross section, working together to achieve reliable transmission of bending moment.

[0018] (3) Convenient construction and disassembly. The middle section of the double-ended reverse threaded liner is designed with a hexagonal cross section, which facilitates the use of standard tools (such as wrenches) for screwing and tightening operations, making construction convenient and quality easy to control. This node is a purely mechanical connection, which does not require on-site welding and can achieve rapid and repeated disassembly and assembly, greatly facilitating later maintenance, modification and component recycling.

[0019] (4) Wide range of applications. It is not only suitable for round steel pipe columns, but also for various components such as round steel pipe truss members and round steel pipe supports. It can be widely used in engineering scenarios such as high-rise buildings, prefabricated buildings, bridges, and tower and mast structures, meeting the high requirements for structural aesthetics, compactness and disassembly. Attached Figure Description

[0020] Figure 1 A schematic diagram of a round steel pipe splicing node based on a double-headed reverse thread combined tapping bushing; Figure 2 This is a cross-sectional view of a round steel pipe splicing node based on a double-headed reverse thread combined tapping bushing; Figure 3 This is a schematic diagram of the internally threaded connecting pipe in a round steel pipe splicing node based on a double-headed reverse thread combined tapping bushing. Figure 4 This is a schematic diagram of the double-ended reverse threaded bushing in a round steel pipe splicing node based on a double-ended reverse threaded combined tapping bushing. Figure 5 This is a schematic diagram of a composite round steel pipe that is connected using a splicing node based on a double-headed reverse thread combined tapping bushing.

[0021] Reference numerals: 1-Internal threaded connecting pipe; 2-Double-ended reverse threaded liner; 3-Round steel pipe; 4-Weld; 11-Cylindrical block; 12-Internal thread; 13-Chamfer; 21-Middle section; 22-Upper threaded rod; 23-Lower threaded rod. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0023] Example 1 This embodiment provides a round steel pipe splicing node based on a double-ended reverse thread combined tapping bushing, such as... Figure 1-5 As shown, it includes: The double-ended reverse threaded bushing 2 includes a middle section 21 and an upper screw 22 and a lower screw 23 located at both ends of the middle section 21. The upper screw 22 and the lower screw 23 are respectively provided with external threads in opposite directions. Two internally threaded connecting pipes 1 are respectively located on the upper and lower sides of the double-ended reverse threaded liner 2. The inner wall of the internally threaded connecting pipe 1 is provided with an internal thread 12 that matches the external thread of the screw at both ends of the double-ended reverse threaded liner 2, and the outer side is provided with a chamfer 13. The internally threaded connecting pipe 1 and the end of the round steel pipe 3 are fixedly connected by a weld 4.

[0024] Example 2 This embodiment provides a round steel pipe splicing node based on a double-ended reverse thread combined tapping bushing, such as... Figure 1-5 As shown, it includes: The double-ended reverse threaded bushing 2 includes a middle section 21 and an upper screw 22 and a lower screw 23 located at both ends of the middle section 21. The upper screw 22 and the lower screw 23 are respectively provided with external threads in opposite directions. Two internally threaded connecting pipes 1 are respectively located on the upper and lower sides of the double-ended reverse threaded liner 2. The inner wall of the internally threaded connecting pipe 1 is provided with an internal thread 12 that matches the external thread of the screw at both ends of the double-ended reverse threaded liner 2, and the outer side is provided with a chamfer 13. The internally threaded connecting pipe 1 and the end of the round steel pipe 3 are fixedly connected by a weld 4.

[0025] In a specific embodiment, the external shape of the internally threaded connecting pipe 1 matches the shape of the inner wall of the round steel pipe 3, and the outer diameter of the internally threaded connecting pipe 1 matches the inner diameter of the round steel pipe 3.

[0026] In a specific embodiment, the cross-section of the middle section 21 is hexagonal. This facilitates the use of standard tools for screwing and tightening during construction.

[0027] In a specific embodiment, the internally threaded connecting pipe 1 includes a hollow cylindrical block 11.

[0028] In a specific embodiment, the lengths of the upper screw 22 and the lower screw 23 are matched with the depth of the internal thread 12 of the internal thread connecting pipe 1.

[0029] In a specific embodiment, the chamfer 13 is located on the outer side of the internally threaded connecting pipe 1 at the end away from the double-ended reverse threaded liner 2.

[0030] In a specific embodiment, the internal thread 12 of the internal threaded connecting pipe 1 is coaxial with the axis of the round steel pipe 3 to ensure that the force transmission path is along the axial direction.

[0031] In a specific embodiment, the opposite side dimension of the hexagonal cross-section of the middle section 21 of the double-ended reverse-threaded bushing 2 is larger than the outer diameter of the upper screw 22 and the lower screw 23. This provides a sufficient torsional cross-section to resist the tightening torque during construction.

[0032] In a specific implementation, the axial length of the node does not exceed 10cm.

[0033] In a specific implementation, the tensile force is transmitted through the thread between the double-ended reverse threaded liner 2 and the internally threaded connecting pipe 1, the pressure is transmitted through the extrusion surface between the middle section 21 of the double-ended reverse threaded liner 2 and the internally threaded connecting pipe 1, and the shear force is transmitted through the thick wall of the double-ended reverse threaded liner 2.

[0034] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0035] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A round steel pipe splicing joint based on double-end reverse thread combined tapping bushing, characterized in that, The utility model relates to a double-end reverse thread liner (2) comprising a middle section (21) and upper and lower side screws (22, 23) provided at both ends of the middle section (21), the upper and lower side screws (22, 23) being respectively provided with external threads of opposite rotation directions; two internally threaded adapter pipes (1) provided at the upper and lower sides of the double-end reverse thread liner (2), the inner wall of the internally threaded adapter pipe (1) being provided with internal threads (12) matching the external threads of the screws at both ends of the double-end reverse thread liner (2), and the outer side being provided with a chamfer (13); the internally threaded adapter pipe (1) is fixedly connected to the end of a round steel pipe (3) by a weld (4). The outer shape of the internally threaded adapter pipe (1) matches the shape of the inner wall of the round steel pipe (3), and the outer diameter of the internally threaded adapter pipe (1) matches the inner diameter of the round steel pipe (3). The cross section of the middle section (21) is hexagonal. The internally threaded adapter pipe (1) comprises a hollow cylindrical block (11).

2. A round steel pipe spliced joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, The length of the upper and lower side screws (22, 23) matches the depth of the internal threads (12) of the internally threaded adapter pipe (1).

3. A round steel pipe splicing joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, The chamfer (13) is provided at the end of the internally threaded adapter pipe (1) away from the double-end reverse thread liner (2).

4. A round steel pipe splicing joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, The internal threads (12) of the internally threaded adapter pipe (1) are coaxially arranged with the axis of the round steel pipe (3), ensuring that the force transmission path is along the axial direction.

5. A round steel pipe spliced joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, The opposite side dimension of the hexagonal cross section of the middle section (21) of the double-end reverse thread liner (2) is greater than the outer diameter of the upper and lower side screws (22, 23).

6. A round steel pipe spliced joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, The axial length of the node is not more than 10 cm.

7. A round steel pipe spliced joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, The tension is transmitted through the threads between the double-end reverse thread liner (2) and the internally threaded adapter pipe (1), the pressure is transmitted by the extrusion surface of the middle section (21) of the double-end reverse thread liner (2) and the internally threaded adapter pipe (1), and the shear force is transmitted by the thick wall of the double-end reverse thread liner (2).

8. A round steel pipe spliced joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, ​ 9. A round steel pipe spliced joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, ​ 10. A round steel pipe spliced joint based on a double-end reverse thread combined tapping bushing according to claim 1, characterized in that, ​

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