Space grid steel structure node reinforcing body and reinforcing method

Abstract

The invention belongs to the technical field of space grid structures, and particularly relates to a space grid steel structure node reinforcing body and a reinforcing method.The space grid steel structure node reinforcing body comprises an original node 20, the original node 20 is fixedly connected with the ends of at least two original rod pieces 21, the exterior of the original node 20 is wrapped with the reinforcing body, the reinforcing body is of a hollow structure, and the reinforcing body is fixedly connected with all the original rod pieces 21; the reinforcing body is divided into a plurality of structural assemblies by the plane where the axis of each original rod piece 21 is located, each structural assembly is divided into a front sub-assembly and a rear sub-assembly, and a reinforcing structure is arranged between the front sub-assembly and the rear sub-assembly, so that the connecting strength is improved, the length of the rod piece is effectively reduced, the slenderness ratio of the steel structure rod piece is reduced, and the stability stress of the rod piece is reduced. And the rod piece meets the requirement of designing a new bearing structure.

Description

Technical Field

[0001] The invention belongs to the technical field of space grid structures, and in particular relates to a space grid steel structure node reinforcement body and a reinforcement method. Background Art

[0003] The space grid steel structure has the characteristics of bar system stress, excellent overall stress performance, good integrity, and the bars are connected by bolt balls, welded balls or intersecting nodes. The component models between different nodes can be freely selected, which can make the bars give full play to their bearing capacity and save materials. The space grid structure has the characteristics of large span, high height, lightness, and load sensitivity. For example, adding photovoltaic panels to its roof will increase the design load by about 10%. Therefore, the stability stress of a large number of steel structure bars does not meet the bearing capacity requirements. Usually, the nodes and bars of the space grid steel structure are reinforced by setting up scaffolding and replacing bars and nodes, which is expensive, time-consuming and has greater safety risks. Summary of the invention

[0004] In order to solve the problem that replacing rods and nodes is costly, time-consuming and has great safety risks, the present invention provides a spatial grid steel structure node reinforcement body and reinforcement method.

[0005] The objective of the present invention is achieved in the following manner: a spatial grid steel structure node reinforcement body, comprising an original node 20, the original node 20 is fixedly connected to the ends of at least two original rods 21, the original node 20 is covered with a reinforcement body on the outside, the reinforcement body is a hollow structure, the reinforcement body is fixedly connected to all the original rods 21, the reinforcement body is divided into a plurality of structural components according to the plane where the axis of each original rod 21 is located, each structural component is divided into two front and rear sub-components, and a reinforcement structure is arranged between the front and rear sub-components.

[0006] Furthermore, sleeves 11 corresponding to the number and position of the original rod 21 are arranged on the peripheral side of the reinforcement body, and the reinforcement body is fixedly connected to the original rod 21 through the sleeves 11. Each structural component has a sleeve assembly that constitutes a complete sleeve 11. Connecting steel plates 6 are arranged on both sides of each sleeve assembly. When multiple structural components are assembled, the connecting steel plates 6 of adjacent sleeve assemblies abut against each other and are fixedly connected by connecting bolts 7.

[0007] Furthermore, an internal thread is provided in the sleeve 11 , and an external thread 211 matching the internal thread is provided on the original rod 21 .

[0008] Furthermore, a reinforcing structure is provided between the front and rear subassemblies, which means that: the front and rear subassemblies are respectively provided with a strut 9 inwardly, the strut 9 extends at least one stiffening rib 8 laterally, the stiffening rib 8 is fixedly connected to the inner wall of the subassembly, one end of the strut 9 is fixedly connected to the inner wall of the subassembly, and the other end of the strut 9 is fixedly connected to the end of the strut 9 of the other subassembly.

[0009] Furthermore, the support rod 9 is a hollow rod, and a zipper 10 is arranged inside the support rod 9. Both ends of the zipper 10 pass through the outer walls of the front and rear subassemblies respectively and are anchored.

[0010] Furthermore, the support rod 9 is parallel to the force direction of the rod.

[0011] A method for reinforcing a spatial grid steel structure node including the above-mentioned reinforcement body, the method comprising the following steps: S1. Find the nodes that need to be reinforced according to the spatial grid steel structure, and design the structure of the reinforcement body and the segmentation structure of the structural components according to the size, quantity and position of the rods connected to the node; S2. According to the design of S1, the outer shell of the reinforcement body is processed and produced, and the corresponding sleeve 11 is fixed. The inner wall of the sleeve 11 is provided with an internal thread; the reinforcement body is divided, and the connecting steel plate 6 is welded on the sleeve assembly, and the fixed support rod 9 is welded on the inner wall of the structural assembly; S3, during construction, thread is made at the corresponding position of the original rod 21 to form an external thread 211, and the structural components are assembled outside the original node 20 to form a complete reinforcement body, and the adjacent connecting steel plates 6 are connected and fixed by connecting bolts 7, and the abutting parts without connecting steel plates 6 are welded and fixed; S4. A zipper 10 is arranged in the hollow support rod 9, and prestress is applied to the zipper 10. The zipper 10 passes through both ends of the support rod 9 and is anchored on the outer surface of the reinforcement body.

[0012] Compared with the prior art, the present invention increases the connection strength by setting a new reinforcement body outside the node, effectively reduces the length of the rod, reduces the slenderness ratio of the steel structure rod, reduces the stability stress of the rod, and makes the rod meet the requirements of designing a new load-bearing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a reinforcement body; Figure 2 is a structural diagram of one of the structural components; Figure 3 yes Figure 2 Bottom view of .

[0014] Among them, 1-structural component one; 2-structural component two; 3-structural component three; 4-structural component four; 5-structural component five; 6-connecting steel plate; 7-connecting bolt; 8-stiffening rib; 9-strut; 10-zipper; 11-sleeve; 20-original node, 21-original member, 211-external thread. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the present invention, unless otherwise clearly stipulated and limited, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0017] As attached Figure 1-2 As shown, a spatial grid steel structure node reinforcement body includes an original node 20, the original node 20 is fixedly connected to the ends of at least two original rods 21, the original node 20 is covered with a reinforcement body, the reinforcement body is a hollow structure, and preferably a hollow spherical structure, the reinforcement body is fixedly connected to all the original rods 21, and the reinforcement body is divided into a plurality of structural components according to the plane where the axis of each original rod 21 is located, each structural component is divided into two front and rear sub-components, and a reinforcement structure is arranged between the front and rear sub-components.

[0018] Here Figure 1 For example, Figure 1 In the figure, five original rods 21 are located in the same plane, so they can be sliced ​​along the plane to form the front and back sides, and the front and back sides are further sliced ​​according to the number of original rods 21 to form structural component one 1; structural component two 2; structural component three 3; structural component four 4; structural component five 5 in order to facilitate installation.

[0019] Furthermore, sleeves 11 corresponding to the number and position of the original rod 21 are arranged on the peripheral side of the reinforcement body, and the reinforcement body is fixedly connected to the original rod 21 through the sleeves 11. Each structural component has a sleeve assembly that constitutes a complete sleeve 11. Connecting steel plates 6 are arranged on both sides of each sleeve assembly to form a flange surface structure. When multiple structural components are assembled, the connecting steel plates 6 of adjacent sleeve assemblies abut against each other and are fixedly connected by connecting bolts 7.

[0020] Furthermore, an internal thread is provided in the sleeve 11, and an external thread 211 matching the internal thread is provided on the original rod 21. Since the original node 20 and the original rod 21 are structurally fixed, multiple structural components are installed in sequence during installation, and the internal thread of the structural component is directly engaged and fixed with the external thread 211 on the original rod 21 instead of being screwed together.

[0021] Further, as attached Figure 3 As shown, a reinforcing structure is provided between the front and rear subassemblies, which means that: a strut 9 is respectively provided inwardly of the front and rear subassemblies, at least one stiffening rib 8 extends laterally from the strut 9, the stiffening rib 8 is fixedly connected to the inner wall of the subassembly, one end of the strut 9 is fixedly connected to the inner wall of the subassembly, and the other end of the strut 9 is fixedly connected to the end of the strut 9 of the other subassembly; the two struts 9 can be fixed by sleeve fixing or welding fixing. Preferably, as shown in the figure, the strut 9 is a thin rod, a circle of limiting steps is provided on the strut 9, and an additional sleeve rod that can be covered on the outside of the strut 9 is prepared. During installation, the two struts 9 are respectively inserted into the two ends of the sleeve rod, and the limiting steps of the two struts 9 are respectively abutted against the two ends of the sleeve rod.

[0022] Furthermore, the support rod 9 is a hollow rod, and a zipper 10 is arranged inside the support rod 9. The zipper 10 is preferably prestressed, and both ends of the zipper 10 pass through the outer walls of the front and rear subassemblies respectively and are anchored.

[0023] Furthermore, the support rod 9 is parallel to the force direction of the rod. Figure 1 For example, Figure 1 In the figure, the five structural components are located in the same plane. This structure is commonly found at the top of a spatial grid steel structure and generally bears a vertical load, that is, a direction perpendicular to the direction of the drawing, so the direction of the support rod 9 is also preferably in this direction.

[0024] A method for reinforcing a spatial grid steel structure node including the above-mentioned reinforcement body, the method comprising the following steps: Professional organizations or personnel conduct reliability appraisals on existing spatial grid steel structures, draw drawings that conform to the current situation, and restore the original reinforcement system based on the completion drawings of this project. Generally, large-span spatial grid systems are composed of tens of thousands of rods and nodes. The restoration work is arduous and is the basis for reinforcing nodes and rods. It is imperative to keep the rods, nodes, completion drawings and current situation consistent; establish a model, input loads, calculate according to current regulations and specifications, and find out the nodes and rods that do not meet the requirements.

[0025] The bolt ball node of the space network steel structure is more complicated. Taking the bolt ball node as an example, the gray part of the drawing is the bolt ball node, including the bolt ball, high-strength bolts, rods, cone head vertebral plates, sleeves, pins, etc. This is the original structure part. If it is confirmed that the node does not meet the bearing capacity requirements under the condition of additional load, it will be reinforced as follows.

[0026] According to the restored structural model, add constant, live, wind, snow, temperature, earthquake and other loads (including newly added photovoltaic panel loads), review according to the current regulations and specifications, find out the rods and nodes that do not meet the design requirements, set the node reinforcement bodies of this patent on these rods and nodes, use simulation calculation software to calculate the rods and nodes, and adjust them until the reliability requirements are met.

[0027] Draw the actual node details for the appraisal and testing unit, arrange the node reinforcement bodies of this patent, and use space simulation software to lay out the reinforcement bodies of this patent.

[0028] According to the spatial grid steel structure, find the nodes that need to be reinforced, and design the structure of the reinforced body and the split structure of the structural components according to the size, number and position of the rods connected to the node.

[0029] According to the above design, the processing factory processes and manufactures the components, connectors, sleeves 11, struts 9, sleeve internal threads, stiffening ribs 8, etc., and equips them with zippers 10 and anchors. The outer shell of the reinforcement body is processed and produced, and the corresponding sleeve 11 is fixed. The inner wall of the sleeve 11 is provided with internal threads; the reinforcement body is divided, and the connecting steel plate 6 is welded on the sleeve assembly, and the fixed struts 9 are welded on the inner wall of the structural assembly.

[0030] According to the characteristics of the spatial grid, with the help of existing horseways or rods, personnel can easily find the original rods 21 and original nodes 20 that do not meet the design requirements. First, the original rods 21 that do not meet the design requirements are threaded. According to the reinforced body of the simulated lofting and the original node template, the original rod 21 part corresponding to the sleeve 11 is threaded using professional tools.

[0031] During construction, threads are made at corresponding positions of the original rod members 21 to form external threads 211, and structural components are assembled outside the original nodes 20 to form a complete reinforcement body. Adjacent connecting steel plates 6 are connected and fixed by connecting bolts 7, and the abutting parts of the connecting steel plates 6 are not welded and fixed.

[0032] A zipper 10 is arranged in the hollow support rod 9, and prestress is applied to the zipper 10. The zipper 10 passes through both ends of the support rod 9 and is anchored on the outer surface of the reinforcement body.

[0033] The components are placed so that the internal threads of the support rod 9 and the sleeve 11 are aligned with the original rod, and the bolts are used for initial connection at the reserved bolt holes at the connecting steel plate 6. The support rod 9 greatly increases the compressive stiffness of the reinforcement body and effectively reduces the thickness of the component. The threaded connection between the sleeve 11 and the original rod 21 can effectively reduce the length of the original rod 21 and reduce the stability stress of the original rod 21, so that the original rod 21 meets the requirements of the new design specifications.

[0034] Equal strength welding is used at the joints of the components to form a circular reinforced body.

[0035] Finally, the zipper 10 inside the strut 9 is tensioned and anchored at both ends of the assembly. Therefore, under the action of the strut 9 and the zipper 10, the reinforced body is strengthened in tension and compression, which can ensure the safety of the reinforced nodes of the spatial grid steel structure.

[0036] A spatial grid steel structure node reinforcement body can effectively reduce the cost of spatial grid structure nodes, and it is preliminarily estimated that it can be reduced to 1 / 10 of the market price; when implemented, there is no need to lay large-scale scaffolding, and small equipment can be used, and it can be completed manually; the reinforcement body has a light structure, strong rigidity, and safety, and can effectively reinforce the steel structure nodes, which is very efficient and energy-saving.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, which should also be regarded as the scope of protection of the present invention.

Claims

1. A spatial grid steel structure node reinforcement body, comprising an original node (20), wherein the original node (20) is fixedly connected to the ends of at least two original rods (21), characterized in that: The original node (20) is externally covered with a reinforcement body, which is a hollow structure. The reinforcement body is fixedly connected to all the original rods (21). The reinforcement body is divided into a plurality of structural components according to the plane where the axis of each original rod (21) is located. Each structural component is divided into two front and rear sub-components, and a reinforcement structure is arranged between the front and rear sub-components.

2. A spatial grid steel structure node reinforcement body as claimed in claim 1, characterized in that: Sleeves (11) corresponding in number and position to the original rod (21) are arranged on the peripheral side of the reinforcement body, and the reinforcement body is fixedly connected to the original rod (21) via the sleeves (11). Each structural component has a sleeve assembly that forms a complete sleeve (11), and connecting steel plates (6) are arranged on both sides of each sleeve assembly. When multiple structural components are assembled, the connecting steel plates (6) of adjacent sleeve assemblies are abutted and fixedly connected via connecting bolts (7).

3. A spatial grid steel structure node reinforcement body as claimed in claim 2, characterized in that: An internal thread is provided in the sleeve (11), and an external thread (211) matching the internal thread is provided on the original rod (21).

4. A spatial grid steel structure node reinforcement body as claimed in claim 1, characterized in that: The reinforcement structure is provided between the front and rear subassemblies, that is, the front and rear subassemblies are respectively provided with support rods (9) inwardly, the support rods (9) extend at least one stiffening rib (8) laterally, the stiffening rib (8) is fixedly connected to the inner wall of the subassembly, one end of the support rod (9) is fixedly connected to the inner wall of the subassembly, and the other end of the support rod (9) is fixedly connected to the end of the support rod (9) of another subassembly.

5. A spatial grid steel structure node reinforcement body as claimed in claim 4, characterized in that: The support rod (9) is a hollow rod, a zipper (10) is arranged inside the support rod (9), and both ends of the zipper (10) pass through the outer walls of the front and rear subassemblies respectively and are anchored.

6. A spatial grid steel structure node reinforcement body as claimed in claim 4, characterized in that: The support rod (9) is parallel to the force direction of the rod.

7. A method for reinforcing a spatial grid steel structure node comprising a reinforcement body as claimed in any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1. Find the nodes that need to be reinforced according to the spatial grid steel structure, and design the structure of the reinforcement body and the segmentation structure of the structural components according to the size, quantity and position of the rods connected to the node; S2. According to the design of S1, the outer shell of the reinforcement body is processed and produced, and the corresponding sleeve (11) is fixed, and the inner wall of the sleeve (11) is provided with an internal thread; the reinforcement body is divided, and the connecting steel plate (6) is welded to the sleeve assembly, and the fixing support rod (9) is welded to the inner wall of the structural assembly; S3. During construction, threads are made at corresponding positions of the original rods (21) to form external threads (211), and structural components are assembled outside the original nodes (20) to form a complete reinforcement body. Adjacent connecting steel plates (6) are connected and fixed by connecting bolts (7), and the abutting parts without connecting steel plates (6) are welded and fixed; S4. A zipper (10) is arranged in the hollow support rod (9), and prestress is applied to the zipper (10). The zipper (10) passes through both ends of the support rod (9) and is anchored on the outer surface of the reinforcement body.

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