Reinforcing structure and reinforcing method for K-shaped circular steel tube tubular joint

Abstract

The invention discloses a K-shaped round steel pipe tubular joint reinforcing structure and method, and the method comprises the following steps: S1, prefabricating a first reinforcing plate and a second reinforcing plate according to the sizes of a main pipe, a first branch pipe and a second branch pipe of a tubular joint to be reinforced; s2, the two opposite side walls of the left annular plate and the right annular plate are welded to the first branch pipe and the main pipe at the intersecting line of the branch main pipe on one side, and the welding seam direction is in the axis direction of the first branch pipe; s3, the inner side walls of the first upper ring plate, the second upper ring plate and the lower ring plate are welded to the second branch pipe and the main pipe at the intersecting line of the branch main pipe on the other side, and the welding seam direction is in the axis direction of the second branch pipe; and S4, the left annular plate is welded and fixed to the joint of the first upper annular plate and the lower annular plate, and the right annular plate is welded and fixed to the joint of the second upper annular plate and the lower annular plate. The method is suitable for reinforcing and strengthening the existing K-shaped circular steel tube tubular joint, effectively improves the bearing capacity of the steel tube joint, and is also suitable for reinforcing the reinforced joint of the steel tube structure in the design stage.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering and construction, and particularly relates to a reinforcement structure and a reinforcement method for a K-shaped circular steel tube intersecting joint. Background Art

[0002] Due to its excellent mechanical properties, material economy and beautiful appearance, the steel tube structure is widely used in representative infrastructure and various public and civil engineering projects. However, in actual projects, the steel tube wall is relatively thin, resulting in insufficient radial stiffness; as the most widely used directly welded connection joint (i.e., intersecting joint) in the steel tube structure, stress concentration often exists in the weld area, and the bearing capacity of the joint is relatively low (in most cases lower than the bearing capacity of adjacent components). In addition, some steel tube intersecting joints also face adverse situations such as local corrosion due to long-term service. All these situations urgently require strengthening the bearing capacity of the steel tube structure joints.

[0003] In response to the reinforcement requirements of existing steel tube intersecting joints, the existing technologies include externally welding stiffening plates, internally pouring concrete, and internally welding stiffening plates. Comparing several stiffening methods, internally pouring concrete increases the self-weight of the structure and also requires cutting and grooving the existing steel tubes, which will cause damage to the existing structure during the cutting process; internally welding stiffening plates have construction difficulties for existing steel tube intersecting joints. By comprehensively comparing several reinforcement methods, externally welding stiffening plates have the advantages of convenient construction and good reinforcement effect.

[0004] For non-lapped K-shaped circular steel tube intersecting joints, the two branch pipes (web members) in the joint respectively bear axial tension and axial compression. However, the existing method of using sleeves to reinforce K-shaped circular steel tube joints is relatively complex in construction, and the method of using longitudinal plates to reinforce K-shaped circular steel tube joints has an insignificant strengthening effect on axial force. Therefore, it is urgent to improve the existing reinforcement methods. Summary of the Invention

[0005] The purpose of the present invention is to provide a reinforcement structure and a reinforcement method for a K-shaped circular steel tube intersecting joint, which can at least solve one of the technical problems existing in the prior art.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A reinforcement method for a K-shaped circular steel tube intersecting joint of the present invention includes the following steps:

[0008] S1. According to the dimensions of the main pipe, the first branch pipe and the second branch pipe of the intersecting joint to be reinforced, prefabricate a first reinforcement plate and a second reinforcement plate in a factory. The first reinforcement plate includes a left ring plate and a right ring plate symmetrically arranged, and the second reinforcement plate includes a lower ring plate and a first upper ring plate and a second upper ring plate symmetrically arranged above the lower ring plate;

[0009] S2. Weld the two opposite side walls of the left ring plate and the right ring plate to the first branch pipe and the main pipe at the intersection line of the side main pipe, with the welding seam direction along the axis direction of the first branch pipe.

[0010] S3. Weld the inner side walls of the first upper ring plate, the second upper ring plate and the lower ring plate to the second branch pipe and the main pipe at the intersection line of the other side main pipe, with the welding seam direction along the axis direction of the second branch pipe. At this time, the left ring plate penetrates through the gap between the first upper ring plate and the lower ring plate, and the right ring plate penetrates through the gap between the second upper ring plate and the lower ring plate.

[0011] S4. Weld and fix the joints of the left ring plate with the first upper ring plate and the lower ring plate, and weld and fix the joints of the right ring plate with the second upper ring plate and the lower ring plate.

[0012] Further, the to-be-reinforced intersecting joint is a non-lapped K-shaped intersecting joint.

[0013] Further, the main pipe, the first branch pipe and the second branch pipe are all circular steel pipes, and the planar shapes of the first reinforcement plate and the second reinforcement plate are elliptical annular shapes with openings at the top.

[0014] Still further, the opening width of the elliptical annulus of the first reinforcement plate is the same as the diameter of the first branch pipe, and the opening width of the elliptical annulus of the second reinforcement plate is the same as the diameter of the second branch pipe.

[0015] Further, between the left ring plate and the right ring plate and the first branch pipe and the main pipe, at the joints of the left ring plate with the first upper ring plate and the lower ring plate, and at the joints of the right ring plate with the second upper ring plate and the lower ring plate, fillet welds are used for welding.

[0016] Further, the thicknesses of the first reinforcement plate and the second reinforcement plate are greater than or equal to the wall thickness of the main pipe.

[0017] Further, the widths of the first reinforcement plate and the second reinforcement plate are 0.25 - 0.5 times the diameter of the main pipe.

[0018] Still further, the first reinforcement plate and the second reinforcement plate are made of steel with a yield strength similar to that of the main pipe.

[0019] The present invention also provides a reinforcement structure for a K-shaped circular steel tube intersecting joint, which includes a first reinforcement plate and a second reinforcement plate arranged at the intersecting joint of the K-shaped circular steel tube. The first reinforcement plate includes a left ring plate and a right ring plate symmetrically arranged. The two opposite side walls of the left ring plate and the right ring plate are respectively welded and connected to the main pipe and the first branch pipe of the K-shaped circular steel tube. The second reinforcement plate includes a lower ring plate, and a first upper ring plate and a second upper ring plate symmetrically arranged above the lower ring plate. The inner side walls of the first upper ring plate, the second upper ring plate and the lower ring plate are respectively welded and connected to the main pipe and the second branch pipe of the K-shaped circular steel tube. The left ring plate passes through the gap between the first upper ring plate and the lower ring plate, and the right ring plate passes through the gap between the second upper ring plate and the lower ring plate, and the left ring plate is welded and connected to the joints of the first upper ring plate and the lower ring plate, and the right ring plate is welded and connected to the joints of the second upper ring plate and the lower ring plate.

[0020] Further, the main pipe, the first branch pipe and the second branch pipe are all circular steel tubes, and the planar shapes of the first reinforcement plate and the second reinforcement plate are elliptical annular shapes with openings at the top.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0022] The reinforcement structure and reinforcement method for the K-shaped circular steel tube intersecting joint of the present invention realize the convenience of construction operation by setting the first reinforcement plate and the second reinforcement plate due to their relatively light self-weights, and have no influence on the additional load of the original joint. At the same time, the local corrosion condition of the existing K-shaped circular steel tube intersecting joint caused by long-term service is improved. It is not only applicable to the reinforcement and strengthening of the existing (already in service) K-shaped (non-lap) circular steel tube intersecting joint, enabling the two branch pipes to have stronger abilities to bear axial tension and axial pressure, effectively improving the bearing capacity of the steel tube joint and the strength of the overall frame structure, but also, due to its excellent mechanical properties, simple structure and relatively light self-weight, is equally applicable to the reinforcement of the strengthened joint of the steel tube structure in the design stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a front view structure diagram of the reinforcement structure (including the disassembled diagram of the ring plate planar state) of the K-shaped circular steel tube intersecting joint of the present invention;

[0025] Figure 2Schematic side view structure of the reinforcement structure for the K-shaped circular steel tube intersecting node of the present invention;

[0026] Figure 3 Schematic top view structure of the reinforcement structure for the K-shaped circular steel tube intersecting node of the present invention.

[0027] Explanation of reference numerals: 1, main pipe; 2, first branch pipe; 3, second branch pipe; 4, first reinforcement plate; 41, left ring plate; 42, right ring plate; 5, second reinforcement plate; 51, first upper ring plate; 52, second upper ring plate; 53, lower ring plate. Specific embodiments

[0028] The following details the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following details the technical solutions provided by each embodiment of the present invention with reference to the drawings.

[0032] Embodiment 1

[0033] As Figures 1 to 3 shown, the reinforcement method for the K-shaped circular steel tube intersecting node of Embodiment 1 of the present invention includes the following steps:

[0034] S1. First, according to the dimensions of the main pipe 1, the first branch pipe 2, and the second branch pipe 3 of the to-be-reinforced intersecting node, prefabricate the first reinforcement plate 4 and the second reinforcement plate 5 in the factory. Among them, as Figure 1 shown, the first reinforcement plate 4 includes a left ring plate 41 and a right ring plate 42 symmetrically arranged, and the second reinforcement plate 5 includes a lower ring plate 53, and a first upper ring plate 51 and a second upper ring plate 52 symmetrically arranged above the lower ring plate 53.

[0035] S2. Weld the opposite side walls of the left ring plate 41 and the right ring plate 42 to the first branch pipe 2 and the main pipe 1 at the intersecting line of one side branch main pipe, and the weld direction is along the axis direction of the first branch pipe 2.

[0036] S3. Weld the inner side walls of the first upper ring plate 51, the second upper ring plate 52, and the lower ring plate 53 to the second branch pipe 3 and the main pipe 1 at the intersecting line of the other side branch main pipe, and the weld direction is along the axis direction of the second branch pipe 3. At this time, as Figure 3 shown, the left ring plate 41 passes through the gap between the first upper ring plate 51 and the lower ring plate 53, and the right ring plate 42 passes through the gap between the second upper ring plate 52 and the lower ring plate 53.

[0037] S4. Weld and fix the joints of the left ring plate 41 with the first upper ring plate 51 and the lower ring plate 53, and weld and fix the joints of the right ring plate 42 with the second upper ring plate 52 and the lower ring plate 53.

[0038] In this Embodiment 1, the to-be-reinforced intersecting node is a non-lapped K-shaped intersecting node.

[0039] Moreover, the main pipe 1, the first branch pipe 2, and the second branch pipe 3 are all circular steel pipes, and the planar shapes of the first reinforcement plate 4 and the second reinforcement plate 5 are elliptical annular shapes with openings at the top. Specifically, the opening width of the elliptical annular shape of the first reinforcement plate 4 is the same as the diameter of the first branch pipe 2, and the opening width of the elliptical annular shape of the second reinforcement plate 5 is the same as the diameter of the second branch pipe 3.

[0040] Preferably, fillet welds are used for welding between the left ring plate 41 and the right ring plate 42 and the first branch pipe 2 and the main pipe 1, at the joints of the left ring plate 41 with the first upper ring plate 51 and the lower ring plate 53, and at the joints of the right ring plate 42 with the second upper ring plate 52 and the lower ring plate 53.

[0041] In this Embodiment 1, the thickness of the first reinforcement plate 4 and the second reinforcement plate 5 is greater than or equal to the wall thickness of the main pipe 1, and the width of the first reinforcement plate 4 and the second reinforcement plate 5 is 0.25 - 0.5 times the diameter of the main pipe 1.

[0042] Optionally, the first reinforcement plate 4 and the second reinforcement plate 5 are made of steel with a yield strength similar to that of the main pipe 1.

[0043] Example 2

[0044] As Figures 1 to 3 shown, the reinforcement structure of the K-shaped circular steel tube intersecting joint in this Example 2 includes a first reinforcement plate 4 and a second reinforcement plate 5 arranged at the intersecting joint of the K-shaped circular steel tube. Among them, the first reinforcement plate 4 includes a left ring plate 41 and a right ring plate 42 arranged symmetrically. The opposite side walls of the left ring plate 41 and the right ring plate 42 are respectively welded to the main pipe 1 and the first branch pipe 2 of the K-shaped circular steel tube. And the second reinforcement plate 5 includes a lower ring plate 53 and a first upper ring plate 51 and a second upper ring plate 52 symmetrically arranged above the lower ring plate 53. The inner side walls of the first upper ring plate 51, the second upper ring plate 52 and the lower ring plate 53 are respectively welded to the main pipe 1 and the second branch pipe 3 of the K-shaped circular steel tube. At this time, the left ring plate 41 passes through the gap between the first upper ring plate 51 and the lower ring plate 53, the right ring plate 42 passes through the gap between the second upper ring plate 52 and the lower ring plate 53, and the left ring plate 41 is welded to the joints of the first upper ring plate 51 and the lower ring plate 53, and the right ring plate 42 is welded to the joints of the second upper ring plate 52 and the lower ring plate 53.

[0045] Furthermore, the main pipe 1, the first branch pipe 2 and the second branch pipe 3 are all circular steel tubes, and the planar shapes of the first reinforcement plate 4 and the second reinforcement plate 5 are elliptical rings with openings at the top.

[0046] In this Example 2, the main pipe 1, the first branch pipe 2 and the second branch pipe 3 are all circular steel tubes, and the planar shapes of the first reinforcement plate 4 and the second reinforcement plate 5 are elliptical rings with openings at the top. Specifically, the opening width of the elliptical ring of the first reinforcement plate 4 is the same as the diameter of the first branch pipe 2, and the opening width of the elliptical ring of the second reinforcement plate 5 is the same as the diameter of the second branch pipe 3.

[0047] Preferably, fillet welds are used for welding between the left ring plate 41 and the right ring plate 42 and the first branch pipe 2 and the main pipe 1, at the joints of the left ring plate 41 and the first upper ring plate 51 and the lower ring plate 53, and at the joints of the right ring plate 42 and the second upper ring plate 52 and the lower ring plate 53.

[0048] And the thickness of the first reinforcement plate 4 and the second reinforcement plate 5 is greater than or equal to the wall thickness of the main pipe 1. The width of the first reinforcement plate 4 and the second reinforcement plate 5 is 0.25 - 0.5 times the diameter of the main pipe 1. The first reinforcement plate 4 and the second reinforcement plate 5 are made of steel with a yield strength similar to that of the main pipe 1.

[0049] The reinforcement structure and method for the K-shaped circular steel tube concrete-filled tubular joints of the present invention achieve the convenience of construction operations due to their relatively light self-weight by setting the first reinforcement plate and the second reinforcement plate, and have no additional load impact on the original joints. At the same time, the local corrosion condition of the existing K-shaped circular steel tube concrete-filled tubular joints caused by long-term service is improved. It is not only applicable to the reinforcement and strengthening of existing (already in service) K-shaped (non-lap) circular steel tube concrete-filled tubular joints, enabling the two branch pipes to have stronger abilities to bear axial tension and axial pressure, effectively improving the bearing capacity of the steel tube joints and the strength of the overall frame structure. Moreover, due to its excellent mechanical properties, simple structure, and relatively light self-weight, it is also applicable to the reinforcement of the strengthened joints of the steel tube structure in the design stage.

[0050] The embodiments described above are only used to describe the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for reinforcing a K-shaped circular steel pipe intersecting node, characterized in that: The following steps are involved: S1. Prefabricate a first reinforcement plate (4) and a second reinforcement plate (5) in a factory according to the sizes of the intersecting node main pipe (1), the first branch pipe (2) and the second branch pipe (3) to be reinforced, wherein the first reinforcement plate (4) comprises a left ring plate (41) and a right ring plate (42) which are symmetrically arranged, and the second reinforcement plate (5) comprises a lower ring plate (53) and a first upper ring plate (51) and a second upper ring plate (52) which are symmetrically arranged above the lower ring plate (53); S2, welding the two opposite side walls of the left ring plate (41) and the right ring plate (42) to the first branch pipe (2) and the main pipe (1) at the intersection line of one side branch pipe and the main pipe, with the direction of the weld being along the axial direction of the first branch pipe (2); S3, welding the inner side walls of the first upper ring plate (51), the second upper ring plate (52) and the lower ring plate (53) to the second branch pipe (3) and the main pipe (1) at the intersection line of the other side branch pipe, with the weld direction being along the axial direction of the second branch pipe (3), at which time the left ring plate (41) is inserted through the gap between the first upper ring plate (51) and the lower ring plate (53), and the right ring plate (42) is inserted through the gap between the second upper ring plate (52) and the lower ring plate (53); S4. The left ring plate (41) is welded and fixed at the intersection with the first upper ring plate (51) and the lower ring plate (53); the right ring plate (42) is welded and fixed at the intersection with the second upper ring plate (52) and the lower ring plate (53).

2. A reinforcement method for a K-shaped circular steel pipe intersecting node according to claim 1, characterized in that: The intersecting node to be reinforced is a non-overlapping K-shaped intersecting node.

3. The reinforcement method of a K-shaped circular steel pipe intersecting node according to claim 1 is characterized in that: The main pipe (1), the first branch pipe (2) and the second branch pipe (3) are all circular steel pipes, and the planar shapes of the first reinforcement plate (4) and the second reinforcement plate (5) are elliptical rings with an opening at the top.

4. The reinforcement method of a K-shaped circular steel pipe intersecting node according to claim 3 is characterized in that: The opening width of the elliptical ring of the first reinforcing plate (4) is the same as the diameter of the first branch pipe (2), and the opening width of the elliptical ring of the second reinforcing plate (5) is the same as the diameter of the second branch pipe (3).

5. The reinforcement method of a K-shaped circular steel pipe intersecting node according to claim 1 is characterized in that: The intersections between the left ring plate (41) and the right ring plate (42) and the first branch pipe (2) and the main pipe (1), the intersections between the left ring plate (41) and the first upper ring plate (51) and the lower ring plate (53), and the intersections between the right ring plate (42) and the second upper ring plate (52) and the lower ring plate (53) are all welded using fillet welds.

6. The reinforcement method of a K-shaped circular steel pipe intersecting node according to claim 1, characterized in that: The thickness of the first reinforcing plate (4) and the second reinforcing plate (5) is greater than or equal to the wall thickness of the main pipe (1).

7. The reinforcement method of a K-shaped circular steel pipe intersecting node according to claim 1, characterized in that: The width of the first reinforcing plate (4) and the second reinforcing plate (5) is 0.25-0.5 times the diameter of the main pipe (1).

8. A method for reinforcing a K-shaped circular steel pipe intersecting node according to any one of claims 1 to 7, characterized in that: The first reinforcement plate (4) and the second reinforcement plate (5) are made of steel having a yield strength similar to that of the main pipe (1).

9. A reinforcement structure of a K-shaped circular steel pipe intersecting node, characterized in that: The invention comprises a first reinforcing plate (4) and a second reinforcing plate (5) arranged at the intersection node of the K-shaped round steel pipe, wherein the first reinforcing plate (4) comprises a left ring plate (41) and a right ring plate (42) which are symmetrically arranged, and the two side walls opposite to each other of the left ring plate (41) and the right ring plate (42) are respectively welded to the main pipe (1) and the first branch pipe (2) of the K-shaped round steel pipe, and the second reinforcing plate (5) comprises a lower ring plate (53) and a first upper ring plate (51) and a second upper ring plate (52) which are symmetrically arranged above the lower ring plate (53), and the first upper ring plate (51) and the second upper ring plate (52) are respectively welded to each other. The inner side wall of the lower ring plate (53) is respectively welded to the main pipe (1) and the second branch pipe (3) of the K-shaped round steel pipe, the left ring plate (41) is inserted through the gap between the first upper ring plate (51) and the lower ring plate (53), the right ring plate (42) is inserted through the gap between the second upper ring plate (52) and the lower ring plate (53), and the left ring plate (41) is welded to the intersection of the first upper ring plate (51) and the lower ring plate (53), and the right ring plate (42) is welded to the intersection of the second upper ring plate (52) and the lower ring plate (53).

10. A reinforcement structure of a K-shaped round steel pipe intersecting node according to claim 9, characterized in that: The main pipe (1), the first branch pipe (2) and the second branch pipe (3) are all circular steel pipes, and the planar shapes of the first reinforcement plate (4) and the second reinforcement plate (5) are elliptical rings with an opening at the top.

Images