A flange joint suitable for cold-bent thin-walled C-shaped single-layer lattice shell structure

Abstract

This invention relates to the field of spatial structure connection node technology, and discloses an assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel. The node includes a flange body, several C-shaped components circumferentially arranged on the sides of the flange body, and a fixing structure for connecting the flange body and the C-shaped components. The flange body includes two back-to-back bases, each base including a polygonal prism-shaped intermediate web, a panel integrally connected to one end of the intermediate web and fully covering it, and a bearing plate integrally connected to the other end of the intermediate web. Two webs in the same group of members are arranged adjacently, and the flanges of the two C-shaped components are located on opposite sides of their respective webs. Two adjacent webs in two adjacent groups of members are fixedly connected by a connecting plate. The connecting plate is fitted against the side of the intermediate web. This invention, by setting up a flange body and C-shaped components, and connecting them to form an assembled node, can achieve a reliable assembly connection between cold-formed thin-walled C-shaped steel members and the node, exhibiting good node stiffness and load-bearing capacity.

Description

Technical Field

[0001] This invention relates to the field of spatial structure connection node technology, specifically to an assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel. Background Technology

[0002] Single-layer reticulated shell structures are widely used in stadiums, convention centers, transportation hubs, and small-to-medium span industrial and civil buildings due to their excellent spatial stress performance, high overall stiffness, and high material utilization. As key components in single-layer reticulated shell structures where members converge and internal forces are transmitted, the connection performance of nodes directly affects the overall stiffness, redistribution of internal forces, and stable bearing capacity of the structure. In recent years, prefabricated node systems have become an important development direction; however, existing prefabricated node schemes are mostly adapted to closed or symmetrical cross-section members such as I-beams and rectangular steel tubes. For example, patent CN103556714A uses a scheme where the node cylinder is directly bolted to the I-beam member, or patent CN104775520A uses a scheme where the central hub is welded to the end sleeve for insertion.

[0003] However, when using open thin-walled section members such as cold-formed thin-walled C-shaped steel, the aforementioned node solutions are difficult to apply due to their single-sided opening, weak torsional stiffness, and limited space between the flange and web. These solutions generally suffer from insufficient compatibility with cold-formed thin-walled open section members, large node self-weight, unclear connection paths, complex construction, or poor construction tolerance. However, cold-formed thin-walled C-shaped steel also possesses advantages such as light weight, flexible section forming, high degree of industrialization, and convenient transportation and installation, making it a promising candidate for prefabricated spatial structures. Therefore, a prefabricated flange node suitable for single-layer reticulated shell structures made of cold-formed thin-walled C-shaped steel is needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an assembled flange node suitable for single-layer reticulated shell structures of cold-formed thin-walled C-shaped steel. By setting a flange body and C-shaped components, the two are connected to form an assembled node. This node has a clear structure, is easy to connect, and can realize a reliable assembly connection between cold-formed thin-walled C-shaped steel members and nodes. It has good node stiffness and load-bearing capacity, and helps to reduce the self-weight of the node and construction costs, making it suitable for engineering promotion and application.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel, comprising a flange body, a plurality of C-shaped components circumferentially arranged on the side of the flange body, and a fixed connection structure for connecting the flange body and the C-shaped components. The flange body includes two back-to-back bases. Each base includes a multi-faceted intermediate web, a panel integrally connected to one end of the intermediate web and covering the intermediate web, and a bearing plate integrally connected to the other end of the intermediate web. The intermediate web has a hollow cylindrical structure, and the bearing plate extends outward from the end of the intermediate web. Each edge of the intermediate web is provided with a C-shaped component on both sides, and the two C-shaped components on both sides of each edge form a group of rods; the two webs in the same group of rods are arranged adjacent to each other, and the flanges of the two C-shaped components are located on opposite sides of their respective webs. Two adjacent webs in two adjacent groups of members are fixedly connected by a connecting plate; the connecting plate is fitted to the side of the intermediate web.

[0006] Furthermore, the fastening structure includes flange bolt holes opened in the flange plate of the C-type component, a first bolt hole opened in the bearing plate and corresponding to the flange bolt holes, and flange bolts passing through both the flange bolt holes and the first bolt hole.

[0007] Furthermore, the fixed connection structure also includes a web bolt hole opened on the intermediate web plate, a second bolt hole opened on the connecting plate corresponding to the web bolt hole, and a web bolt that passes through both the web bolt hole and the second bolt hole.

[0008] Furthermore, the rolled edges of the two C-shaped components connected by the connecting plate abut against each other.

[0009] Furthermore, the spacing between the two webs in the same group of members is set.

[0010] Furthermore, the cross-section of the intermediate web is a regular hexagon.

[0011] Furthermore, when the end of the C-type component is not provided with a flange body, an intermediate C-type component is provided between the C-type component and the adjacent C-type component in the adjacent rod; the two ends of the web of the intermediate C-type component are respectively fixedly connected to the webs of the two C-type components through a connecting plate.

[0012] A construction method for a prefabricated flange joint includes the following steps: S1: Determine the dimensions of the single-layer reticulated shell to be built, and then determine the quantity of flange body and C-type components accordingly; S2: Prefabricated C-shaped components. The specific method is as follows: Take a C-shaped steel and divide it into three equal parts. There are two equal division positions. After extending a certain distance to both sides of each division position, mark them. Cut off the upper flange plate and the lower flange plate between the two marks on both sides of each division position. The web plate corresponding to the cut flange plate is the intermediate connecting plate. The C-shaped steel between the intermediate connecting plates is the C-shaped component. Two intermediate connecting plates and three C-shaped components are prefabricated from each C-shaped steel. The size of the intermediate connecting plate is the same as the size of the connecting plate. S3: Bend from the junction of the C-shaped component and the intermediate connecting plate to form a triangle with the three C-shaped components. The bending angle ensures that the webs of the two C-shaped components in the same group are parallel. After the two C-shaped components at both ends are bent, their ends are brought close together. Then, a connecting plate is used to connect the webs of the two C-shaped components. S4: The bearing plate is fixedly connected to the flange plate by flange bolts, and the connecting plate or intermediate connecting plate is fixedly connected by web bolts.

[0013] The beneficial effects of this invention are as follows: by setting two abutting polygonal prism-shaped flange bodies, and two back-to-back C-shaped components on each side edge of the flange body, the flange body and the C-shaped components are connected by bolts, and the ends of adjacent C-shaped components are connected by connecting plates to form an assembled node. This node has a clear structure and is easy to connect, which can realize a reliable assembly connection between cold-formed thin-walled C-shaped steel members and nodes. It has good node rigidity and load-bearing capacity, and is conducive to reducing the self-weight of the node and construction costs. It is suitable for engineering promotion and application, and any number of nodes can be connected to each other.

[0014] 2. The flanges and webs of the C-type assembly can be aligned and fitted with different areas of the flange body and connected independently, solving the problem of difficult connection and mutual interference of open thin-walled rods at spatial nodes; the flange body consists only of a polygonal groove and a connecting platform, eliminating the complex central hub, ribs or sleeves, sealing plates and other auxiliary components that need to be welded to the rod end in the existing technology, which facilitates positioning and welding operations during processing, and reduces manufacturing costs and precision control difficulty. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure; Figure 2 This is a partial top-view structural diagram; Figure 3 This is a schematic diagram of the connecting plate structure; Figure 4 This is a schematic diagram of the matrix structure; Figure 5 This is a schematic diagram of a C-type component structure; Figure 6 A schematic diagram of a structure connecting a flange body to a group of rods; Figure 7 This is a schematic diagram of a C-shaped steel bar cut and bent to form a triangle.

[0016] In the diagram: 1. Flange body; 2. Flange bolts; 3. C-type assembly; 4. Web bolt holes; 5. Flange bolt holes; 6. Connecting plate; 7. Intermediate C-type assembly. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The directional terms mentioned in this invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this invention and are not absolute limitations on the actual use.

[0019] Example: like Figures 1-7 As shown, an assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel includes a flange body 1, several C-shaped components 3 arranged in pairs and circumferentially equidistantly on the side of the flange body 1, and a fixed connection structure for connecting the flange body 1 and the C-shaped components 3. The same flange body 1 includes two back-to-back bases. Each base includes a polygonal intermediate web, a panel integrally connected to one end of the intermediate web and fully covering the intermediate web, and a bearing plate integrally connected to the other end of the intermediate web. The intermediate web has a hollow cylindrical structure, and the bearing plate extends outward from the end of the intermediate web parallel to the panel. Here, "one end" and "other end" refer to the top or bottom end of the intermediate web, and "inner" and "outer" refer to the hollow interior relative to the intermediate web, with the interior being the inner side and the exterior being the outer side. The panel and the bearing plate are arranged parallel to each other, and the intermediate web is perpendicular to both. The two bases are symmetrical vertically, and there is a gap between the two panels. The panels are circular. C-type component 3 is a conventional cold-formed inwardly rolled channel steel, including a web, an upper flange, an upper rolled edge, a lower flange, and a lower rolled edge; Each edge of the intermediate web is provided with a C-shaped component 3 on both sides, and the two C-shaped components 3 on both sides of each edge form a group of rods; the two webs in the same group of rods are set adjacent to each other, and the flanges of the two C-shaped components 3 in the same group of rods are located on opposite sides of their respective webs; the number of edges corresponds to the number of rod groups. The two webs of adjacent C-type components 3 in two adjacent sets of rods connected to the flange body 1 are integrally connected by a connecting plate 6; the connecting plate 6 is fitted to the side of the intermediate web; each connecting plate 6 corresponds to one side.

[0020] By setting two abutting polygonal prism-shaped flanges, and two back-to-back C-shaped components on each side edge of the flange, the flange and C-shaped components are connected by bolts, and the ends of adjacent C-shaped components are connected by connecting plates to form an assembled node. This node has a clear structure and is easy to connect, which can realize a reliable assembly connection between cold-formed thin-walled C-shaped steel members and nodes. It has good node rigidity and load-bearing capacity, and helps to reduce the self-weight of the node and construction costs. It is suitable for engineering promotion and application, and any number of nodes can be connected to each other.

[0021] The fixed structure includes flange bolt holes 5 opened on the flange plate of the C-type component 3, a first bolt hole opened on the bearing plate corresponding to the flange bolt holes 5, and flange bolts 2 that pass through both the flange bolt holes 5 and the first bolt hole to connect the flange plate and the bearing plate; the flange plate includes an upper flange plate and a lower flange plate, both of which have flange bolt holes 5 and are respectively connected to the bearing plates of the upper and lower bases of the same flange body 1.

[0022] The fixed connection structure also includes web bolt holes 4 opened on the intermediate web plate, second bolt holes opened on the connecting plate 6 corresponding to the web bolt holes 4, and web bolts that pass through the web bolt holes 4 and the second bolt holes to connect the intermediate web plate and the connecting plate; each connecting plate 6 has a set of second bolt holes opened on the two intermediate web plates of the same flange body 1, and web bolt holes are opened on both intermediate web plates of the same flange body 1.

[0023] This solution requires no on-site welding. The nodes are assembled separately using flange bolts and web bolts, simplifying the process. The assembly sequence of web first and then flange bolts further ensures the stability of the members during installation and the overall rigidity of the final node, significantly improving the construction speed and quality control of the single-layer reticulated shell structure.

[0024] The flanges and webs of the cold-formed thin-walled C-shaped steel are connected to the flange body by bolts, ensuring direct and clear force transmission. The groove-shaped base eliminates the complex central hub, ribs, or auxiliary components such as sleeves and end plates that need to be welded to the rod ends found in existing technologies. This not only reduces manufacturing costs and precision control difficulties but also provides sufficient operating space while forming an effective bending closed section, which helps to improve the stiffness and load-bearing capacity of the joint area.

[0025] The rolled edges and / or flanges of the two C-shaped components 3 connected by the connecting plate 6 abut against each other, thereby determining that the included angle between the flanges of the two C-shaped components 3 is 120 degrees, and also determining the minimum flange width of the C-shaped steel that needs to be cut off.

[0026] The spacing between the two webs in the same group of members is set.

[0027] The cross-section of the intermediate web is a regular hexagon.

[0028] The figure shows only one flange body 1. All C-type components 3 connected to one flange body 1 constitute a node unit. The single-layer reticulated shell includes several sets of node units. Adjacent node units can share some C-type components 3.

[0029] When a flange body 1 is not provided at one end of the C-type component 3, an intermediate C-type component 7 is provided between the C-type component 3 without flange body 1 and the adjacent C-type component 3 in the adjacent rod; the intermediate C-type component 7 is provided opposite to a connecting plate 6 or an intermediate connecting plate, because the connecting plate 6 or the intermediate connecting plate is located at a vertex of a triangle; the structure of the intermediate C-type component 7 is the same as the structure of the C-type component 3; the two ends of the web of the intermediate C-type component 7 are respectively welded to the webs of the adjacent C-type components 3 of the two adjacent rod groups through a connecting plate 6; the C-type component 3 has two ends, which are generally connected to the flange body 1; Flange body 1 can be omitted where it is not needed or at the boundary of the grid shell, but the adjacent C-type component 3 is not supported, so an intermediate C-type component 7 is used for connection.

[0030] When both ends of the C-type component 3 are equipped with flange bodies 1, an intermediate C-type component 7 is also required. In this case, the intermediate C-type component 7 is not only the intermediate C-type component 7 of one flange body 1, but also the C-type component 3 of the other flange body 1. Therefore, the two C-type components 3 and the intermediate C-type component 7 form a triangle, which is also a group. Several groups of triangular components are set around each flange body 1, with the number being the same as the number of edges.

[0031] A construction method for a prefabricated flange joint, characterized by comprising the following steps: S1: Determine the dimensions of the single-layer reticulated shell to be built, and then determine the quantity of flange body 1 and C-type component 3 accordingly; S2: Prefabricate C-shaped component 3. The specific method is as follows: Take a C-shaped steel and divide it into three equal parts. There are two equal division positions. After extending a certain distance to both sides of each division position, mark them. The distance between the marks on both sides of each division position is less than or equal to the horizontal spacing of each side of the intermediate web. The horizontal spacing between these two marks is the width of the connecting plate and the intermediate connecting plate. Cut off the upper flange plate and the lower flange plate between the two marks on both sides of each division position. The web corresponding to the cut flange plate is the intermediate connecting plate. The C-shaped steel between the intermediate connecting plates is the C-shaped component 3. Prefabricate two intermediate connecting plates and three C-shaped components 3 from each C-shaped steel. One of the C-shaped components 3 is the intermediate C-shaped component 7. The size of the intermediate connecting plate is the same as the size of the connecting plate 6. The included angle between the connecting plate or intermediate connecting plate and the web to which it is connected is 120 degrees.

[0032] S3: Bend from the junction of C-shaped component 3 and intermediate connecting plate to form an equilateral triangle with the three C-shaped components 3. The bending angle ensures that the webs of two C-shaped components 3 in the same group are parallel. After bending, the ends of the two C-shaped components 3 at both ends (the two ends of the C-shaped steel) are close together. Then, a connecting plate 6 is used to connect the webs of the two C-shaped components 3. The arrangement of the triangle is not restricted. Therefore, if each vertex of the triangle is connected to a flange body 1, the connecting plate 6 and the intermediate connecting plate are both connected to the flange body 1. If it is only connected to one or two flange bodies 1, the remaining vertex can be either the connecting plate 6 or the intermediate connecting plate. Therefore, the connecting plate 6 at each of the above locations can be replaced by the intermediate connecting plate. S4: Finally, the bearing plate is fixedly connected to the flange plate using flange bolts, and the connecting plate 6 or intermediate connecting plate is fixedly connected using web bolts. The connecting plate 6 and the intermediate connecting plate are the same component, only the manufacturing method is different. The intermediate connecting plate is part of the C-shaped steel, while the connecting plate 6 is a separate component of the same shape and size. Since only two intermediate connecting plates can be constructed from one C-shaped steel, when three C-shaped components 3 are bent into a triangle, an additional connecting plate 6 is needed to connect the two web plates for connection stability. To distinguish the origin of the connecting plate 6, it is divided into an intermediate connecting plate and a connecting plate 6.

[0033] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An assembled flange joint suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel, characterized in that: It includes a flange body (1), several C-type components (3) arranged circumferentially on the side of the flange body (1), and a fastening structure for connecting the flange body (1) and the C-type components (3); The flange body (1) includes two back-to-back bases. Each base includes a multi-faceted intermediate web, a panel integrally connected to one end of the intermediate web and fully covering the intermediate web, and a support plate integrally connected to the other end of the intermediate web. The intermediate web has a hollow cylindrical structure, and the support plate extends outward from the end of the intermediate web. A C-shaped component (3) is provided on both sides of each edge of the middle web plate. The two C-shaped components (3) on both sides of each edge form a group of rods. The two web plates in the same group of rods are arranged adjacent to each other, and the flanges of the two C-shaped components (3) are located on opposite sides of their respective web plates. Two adjacent webs in two adjacent groups of members are connected by a connecting plate (6); the connecting plate (6) is fitted to the side of the intermediate web.

2. The assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel according to claim 1, characterized in that: The fixed structure includes a flange bolt hole (5) opened in the flange plate of the C-type component (3), a first bolt hole opened in the bearing plate and corresponding to the flange bolt hole (5), and a flange bolt (2) passing through both the flange bolt hole (5) and the first bolt hole.

3. A prefabricated flange joint suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel according to claim 1 or 2, characterized in that: The fixed structure also includes a web bolt hole (4) on the intermediate web, a second bolt hole on the connecting plate (6) corresponding to the web bolt hole (4), and a web bolt that passes through both the web bolt hole (4) and the second bolt hole.

4. The assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel according to claim 1, characterized in that: The flanges of the two C-shaped components (3) connected by the connecting plate (6) abut against each other.

5. The assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel according to claim 1, characterized in that: The spacing between the two webs in the same group of members is set.

6. The assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel according to claim 1, characterized in that: The cross-section of the intermediate web is a regular hexagon.

7. The assembled flange node suitable for a single-layer reticulated shell structure of cold-formed thin-walled C-shaped steel according to claim 1, characterized in that: An intermediate C-type component (7) is provided between the C-type component (3) and the adjacent C-type component (3) in the adjacent member; the two ends of the web of the intermediate C-type component (7) are fixedly connected to the webs of the two C-type components (3) through connecting plates (6).

8. A construction method for a prefabricated flange joint, characterized in that, Includes the following steps: S1: Determine the dimensions of the single-layer reticulated shell to be built, and then determine the dimensions and quantity of the flange body (1) and C-type components (3) accordingly; S2: Prefabricated C-shaped component (3), the specific method is as follows: take a C-shaped steel, divide it into three equal parts, there are two equal division positions, extend a distance to both sides of the equal division position and make a mark, cut off the upper flange plate and lower flange plate between the two marks on both sides of each equal division position, the web plate corresponding to the cut flange plate is the intermediate connecting plate, and the C-shaped steel between the intermediate connecting plates is the C-shaped component (3). S3: Bend from the junction of the C-shaped component (3) and the intermediate connecting plate to make the three C-shaped components (3) form a triangle. The bending angle ensures that the webs of the two C-shaped components (3) in the same group are parallel. Then take a connecting plate (6) to connect the two webs that were not connected after bending. S4: The bearing plate is fixedly connected to the flange plate by flange bolts, and the connecting plate (6) or intermediate connecting plate is fixedly connected by web bolts.

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