Single-layer latticed shell structure node suitable for cold-formed thin-walled steel with C-shaped section

Abstract

The invention discloses a single-layer latticed shell structure joint suitable for cold-formed thin-walled steel with a C-shaped section, and belongs to the technical field of steel structure engineering. The single-layer latticed shell structure node comprises a connecting node and a C-shaped steel combined component connected to the outer side of the connecting node, the connecting node is formed by connecting a center hub body and connecting pieces, the center hub body is of a hollow prism structure, and the outer side wall of each prism face of the center hub body is connected with one connecting piece; the connecting piece is formed by vertically connecting the middle of an upper flange plate and the middle of a lower flange plate through a web plate, the web plate comprises a middle web plate and two side web plates, and the two side web plates are connected to the two side faces of the middle web plate in an opening shape in the horizontal direction; the C-shaped steel combined component is formed by connecting three C-shaped components in a triangular mode, and the C-shaped components are connected to the two side webs on the connecting piece. Through the design of the connecting pieces and the C-shaped steel combined members, the force transmission path of the latticed shell structure is changed, and the overall performance of the latticed shell structure is enhanced.

Description

Technical Field

[0001] The invention relates to an assembled hub node of a steel structure, in particular to a single-layer lattice shell structure node suitable for cold-bent thin-walled steel sections with a C-section, and belongs to the technical field of steel structure engineering. Background Art

[0002] As my country has focused on promoting the development of prefabricated structures in recent years, various structural forms are seeking to use prefabricated components to meet the needs of assembly and disassembly. Compared with traditional welded nodes, prefabricated nodes are more conducive to ensuring project quality, shortening construction period, saving resources and reducing pollution.

[0003] At present, the existing public prefabricated node structures have the problems of complex structure and poor force stability. For example, the Chinese patent with application publication number CN105178443A and invention name "A bolt connection node suitable for rectangular steel tube single-layer lattice shell" discloses a node structure that can facilitate the connection of rectangular steel tube single-layer lattice shell rods, but the existing force transmission path is single, and the rods are often unstable due to unbalanced force distribution at the node, which eventually destroys the lattice shell structure.

[0004] Therefore, it is urgent to design a single-layer lattice shell structure node with good force stability and node stiffness. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and provide a single-layer lattice shell structure node suitable for C-section cold-bent thin-walled steel. Through the design of the connecting piece, the node connection can be realized by only two-step bolt connection, the connection method is simple and the installation steps are simplified; and through the design of the C-shaped steel composite component, two C-shaped components with angles are arranged at one connection point, which changes the force transmission path of the lattice shell structure, enhances the overall performance of the lattice shell structure, and ensures the node stiffness and bearing capacity of the lattice shell structure.

[0006] To achieve the above object, the present invention adopts the following technical scheme: a single-layer lattice shell structure node suitable for C-section cold-bent thin-walled steel, the single-layer lattice shell structure node comprises a connection node and a C-shaped steel composite member connected to the outside of the connection node, wherein the connection node is composed of a central hub body and a connecting piece connected together, the central hub body is a hollow prism structure, and a connecting piece is fixedly connected to the outer wall of each prism face of the central hub body through a web bolt; The connector is composed of an upper flange plate and a lower flange plate connected vertically by a web plate, wherein the web plate includes a middle web plate and two side web plates, the middle web plate is flushly connected to one side of the upper flange plate and the lower flange plate, and the two side web plates are connected to the two side surfaces of the middle web plate in an open shape in the horizontal direction, and the angle between the two side web plates in the horizontal direction is 60°~72°, and the arch angle between the connector and the center hub body is 0~20°; The C-shaped steel composite member is composed of three C-shaped members connected in a triangle, and the curled edge of the C-shaped member is arranged in the inner direction of the triangle; the C-shaped member is connected to the two side webs on the connecting piece through flange bolts, and the web of the C-shaped member is fitted and connected with the inner side of the side web.

[0007] The upper and lower ends of the center hub body are provided with a center hub body opening cover plate with a circular hole in the middle, and each edge surface of the center hub body is also provided with a center hub body bolt hole in the vertical direction; the middle web of the connecting piece is provided with a web bolt hole corresponding to the center hub body bolt hole, and the center hub body and the connecting piece are fixedly connected together by web bolts passing through the center hub body bolt hole and the web bolt hole.

[0008] The middle part of the central hub body is also horizontally connected with a middle partition plate, and the middle partition plate divides the inner cavity of the central hub body into two parts, an upper part and an lower part.

[0009] The upper flange plate and the lower flange plate of the connecting piece are correspondingly provided with flange bolt holes distributed in a triangular shape, wherein the tip of the triangle is on the inner side; the ends of the two C-shaped members are arranged to be non-curled, and the webs of the two C-shaped members are fitted with the inner sides of the side webs, the connections are overlapped and fixed in the connecting piece by flange bolts passing through the flange bolt holes.

[0010] The width of each facet in the central hub body matches the width of the middle web in the connecting member.

[0011] The flange bolts and web bolts are all full-thread high-strength bolts, and their model is GB / 5783 8.8 grade hexagonal head high-strength bolts.

[0012] The C-shaped member is a C-shaped cross-section cold-bent thin-walled steel.

[0013] The beneficial effects of the present invention are: 1) In the present invention, the node connection can be realized by only two-step bolt connection through the design of the connecting piece, and the connection method is simple and the installation steps are simplified; by incorporating the cold-bent thin-walled C-shaped steel into the single-layer lattice shell structure, and by designing the C-shaped steel composite component, two C-shaped components with an angle are set at one connection point, which changes the force transmission path of the lattice shell structure. When the node is subjected to axial force or bending moment, the axial force is transmitted to the C-shaped component by the tension of the bolts on one side of the central hub body or the extrusion of the connecting piece on this side and the central hub body, and then transmitted to the next two nodes, thereby improving the stability of the lattice shell structure connection and the node stiffness, and enhancing the overall performance of the lattice shell structure.

[0014] 2) The node structures of the present invention are all cold-bent thin-walled steel sections with light deadweight, high degree of industrialization, and various cross-sectional forms. The cross-sectional form and size can be selected according to the needs of the lattice shell structure, which is convenient for structural design and analysis. The nodes are bolted as a whole, and the overall bending stiffness is high. The bearing capacity of the nodes themselves has been reinforced by internal reinforcement and the like. Moreover, due to its light deadweight and simple assembly characteristics, the installation efficiency of the lattice shell structure at high altitude is improved, the installation and structural costs are reduced, the construction costs are reduced, and it is conducive to the popularization and application of engineering projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a single-layer lattice shell structure node of the present invention; Figure 2 for Figure 1 A magnified schematic diagram of the structure at the center of the mid-node connection; Figure 3 for Figure 2 A top view of the plan; Figure 4 for Figure 2 A three-dimensional structural diagram from a frontal perspective; Figure 5 for Figure 1 The three-dimensional structure diagram of the central hub; Figure 6 for Figure 1 A half-section structural diagram of the central hub; Figure 7 for Figure 1 A three-dimensional structural diagram of the middle connector; Figure 8 for Figure 2 Assembly structure diagram of mid-node connection; Fig. 9 for Figure 8 A plan view of the connection of a connector; Fig.10 for Figure 2 A schematic diagram of the cross-sectional structure of the middle C-shaped member 4; Fig.11This is a lattice shell structure diagram after multi-node construction of the single-layer lattice shell structure of the present invention.

[0016] In the figure, 1-center hub body, 101-center hub body opening cover plate, 102-center hub body bolt hole, 103-middle partition plate, 2-connecting piece, 201-middle web, 202-side web, 203-web bolt hole, 204-flange bolt hole, 3-flange bolt, 4-C-type member, 5-web bolt. DETAILED DESCRIPTION

[0017] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0018] Example: Figures 1 to 4 As shown, the present invention provides a single-layer lattice shell structure node suitable for C-section cold-bent thin-walled steel, the single-layer lattice shell structure node includes a connecting node and a C-shaped steel composite component connected to the outer side of the connecting node, wherein the connecting node is composed of a central hub body 1 and a connecting piece 2 connected together, the central hub body 1 is a hollow prismatic structure, and a connecting piece 2 is fixedly connected to the outer side wall of each prism face of the central hub body 1 through a web bolt 5.

[0019] like Figure 5 As shown, the center hub body 1 is made of folded and welded steel, and a center hub body opening cover plate 101 with a circular hole in the middle is welded at the upper and lower ends of the center hub body 1. Two center hub body bolt holes 102 are also vertically opened on each edge of the center hub body 1. If the cross-sectional area is large, it is necessary to increase the number of bolt holes, and increase the number of row and column bolts while meeting the conditions of bolt spacing and margin distance; the upper and lower covers reserve installation space for bolt connection by digging holes.

[0020] like Figure 6 As shown, a middle partition plate 103 is also horizontally connected to the middle of the central hub body 1, and the middle partition plate 103 divides the internal cavity of the central hub body 1 into two upper and lower parts.

[0021] like Figure 7 As shown, the connector 2 is composed of an upper flange plate and a lower flange plate vertically welded in the middle through a web, wherein the web includes a middle web 201 and two side webs 202, and the width of each edge face in the center hub body 1 matches the width of the middle web 201 in the connector 2; the middle web 201 is flush with one side of the upper flange plate and the lower flange plate, and the two side webs 202 are connected to the two side surfaces of the middle web 201 in an open shape in the horizontal direction, and the angle between the two side webs 202 in the horizontal direction is 60°~72°, and the specific angle value is determined by the grid division density of the lattice shell structure; the rod is always perpendicular to the side panel of the hub, the side panel of the hub itself has an angle, and the arch angle between the connector 2 and the center hub body 1 is 0~20°.

[0022] A web bolt hole 203 corresponding to the center hub bolt hole 102 is provided on the middle web 201 of the connector 2. The center hub 1 and the connector 2 are fixedly connected together by web bolts 5 that penetrate through the center hub bolt hole 102 and the web bolt hole 203.

[0023] The upper flange plate and the lower flange plate of the connecting member 2 are correspondingly provided with flange bolt holes 204 distributed in a triangular shape, wherein the tip of the triangle is on the inner side.

[0024] like Figure 1 and Fig.10 As shown, the C-shaped steel composite member is composed of three C-shaped members 4 connected in a triangle. The C-shaped member 4 is a cold-bent thin-walled steel with a C-shaped cross-section, and the curled edge of the C-shaped member 4 is installed in the inner direction of the triangle; the C-shaped member 4 is connected to the two side webs 202 on the connecting member 2 through flange bolts 3, and the web of the C-shaped member 4 is fitted and connected to the inner side of the side web 202.

[0025] The curling edges of the ends of the two C-shaped members 4 are removed, and the removed length is consistent with not hindering the three C-shaped members 4 from being combined into a triangle, and the webs of the two C-shaped members 4 are fitted with the inner side surfaces of the side webs 202, the connections are overlapped and fixed in the connecting member 2 by the flange bolts 3 passing through the flange bolt holes 204.

[0026] The flange bolts 3 and the web bolts 5 are all full-thread high-strength bolts, and their model is GB / 5783 8.8 grade hexagonal head high-strength bolts.

[0027] like Figure 8 and Fig. 9 As shown, the assembly connection process is as follows: The curled edges of the two C-shaped members 4 are punched inward, stacked in a triangle shape, and then placed in the cavity of the connecting member 2 and connected together through the flange bolt holes 3.

[0028] The connecting piece 2 and the central hub body 1 are then connected together through the web bolts 5 .

[0029] like Fig.11 As shown, a short-range linear single-layer lattice shell structure with a span of 50m and a height of 25m is formed by using the combined rods in the lattice shell structure node of the present invention. The hollow position is the position reserved for the node. It can be seen that the node in this lattice shell structure can be connected to 5-6 combined rods, and each rod connects 3 nodes.

[0030] In the present invention, through the design of the connecting piece, the node connection can be realized by only two steps of bolt connection, the connection method is simple and the installation steps are simplified; and through the design of the C-shaped steel composite component, two C-shaped components with an angle are set at one connection point, which changes the force transmission path of the lattice shell structure, enhances the overall performance of the lattice shell structure, and ensures the node stiffness and bearing capacity of the lattice shell structure.

[0031] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A single-layer lattice shell structure node suitable for C-section cold-bent thin-walled steel, characterized by: The single-layer lattice shell structure node comprises a connection node and a C-shaped steel composite member connected to the outside of the connection node, wherein the connection node is composed of a central hub body (1) and a connection piece (2) connected together, the central hub body (1) is a hollow prism structure, and a connection piece (2) is fixedly connected to the outer wall of each prism face of the central hub body (1) via a web bolt (5); The connecting member (2) is composed of an upper flange plate and a lower flange plate connected vertically by a web plate in the middle, wherein the web plate comprises a middle web plate (201) and two side web plates (202), the middle web plate (201) is connected flush with one side of the upper flange plate and the lower flange plate, the two side web plates (202) are connected to the two side surfaces of the middle web plate (201) in an open shape in the horizontal direction, and the angle between the two side web plates (202) in the horizontal direction is 60° to 72°, and the arch angle between the connecting member (2) and the central hub body (1) is 0 to 20°; The C-shaped steel composite component is composed of three C-shaped components (4) connected in a triangular shape, and the curled edges of the C-shaped components (4) are arranged in the inner direction of the triangle; the C-shaped components (4) are connected to two side webs (202) on the connecting member (2) through flange bolts (3), and the webs of the C-shaped components (4) are fitted and connected to the inner side surfaces of the side webs (202).

2. The single-layer lattice shell structure node according to claim 1, characterized in that: The upper and lower ends of the central hub body (1) are both provided with central hub body opening cover plates (101) with a circular hole in the middle, and each edge surface of the central hub body (1) is also provided with a central hub body bolt hole (102) in the vertical direction; the central web (201) of the connecting member (2) is provided with a web bolt hole (203) corresponding to the central hub body bolt hole (102), and the central hub body (1) and the connecting member (2) are fixedly connected together by web bolts (5) penetrating through the central hub body bolt hole (102) and the web bolt hole (203).

3. The single-layer lattice shell structure node according to claim 2, characterized in that: A middle partition (103) is also horizontally connected to the middle of the central hub body (1), and the middle partition (103) divides the internal cavity of the central hub body (1) into two upper and lower parts.

4. The single-layer lattice shell structure node according to claim 1, characterized in that: The upper flange plate and the lower flange plate of the connecting member (2) are correspondingly provided with flange bolt holes (204) distributed in a triangular shape, wherein the tip of the triangle is on the inner side; the ends of the two C-shaped members (4) are arranged to have no curling edges, and the webs of the two C-shaped members (4) are fitted with the inner side surfaces of the side webs (202), the connection parts are overlapped, and the flange bolts (3) are passed through the flange bolt holes (204) and fixed in the connecting member (2).

5. The single-layer lattice shell structure node according to claim 1, characterized in that: The width of each edge face in the central hub body (1) matches the width of the middle web (201) in the connecting member (2).

6. The single-layer lattice shell structure node according to claim 1, characterized in that: The flange bolts (3) and web bolts (5) are all full-thread high-strength bolts, and their model is GB / 5783 8.8 grade hexagonal head high-strength bolts.

7. The single-layer lattice shell structure node according to claim 1, characterized in that: The C-shaped component (4) is a C-shaped cross-section cold-bent thin-walled steel section.

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