Freely curved surface net shell variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid joint and manufacturing and installation method

Abstract

The patent discloses a free curved surface net shell variable-angle adjustable folded plate splicing steel-aluminum alloy mixed node and a manufacturing and installation method, which comprises a variable-angle upper folded plate assembly, a variable-angle lower folded plate assembly, an adjustable core reinforcing part, a core reinforcing steel pipe, a variable-angle shear resisting stiffening rib, a folded plate cover plate, an aluminum alloy rod piece series, a steel rod piece series, an aluminum alloy special stainless steel ring groove rivet, an aluminum alloy rigidity enhancing clamp plate, a ring-shaped supporting plate, a cross-shaped supporting plate, a ring-shaped short stiffening rib and the like. The variable-angle upper folded plate assembly and the variable-angle lower folded plate assembly are both welded from single steel plates with different sizes, each steel plate is not in the same plane, the folding angle can be adjusted according to the axes of the rod pieces of the free curved surface net shell structure, the node connection has higher degrees of freedom and is not limited by the structure curvature. The core reinforcing part is welded between the variable-angle upper folded plate assembly and the variable-angle lower folded plate assembly, and the folded plate cover plate is welded at the joint horizontal position after welding.

Description

Technical Field

[0001] This invention relates to the field of building structure technology, and in particular to a variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid node in a large-span irregular aluminum alloy freeform surface shell-steel frame structure system, and its high-precision manufacturing and assembly installation method. Technical Background

[0002] With the rapid development of productivity and manufacturing, various complex structures with irregular curved surfaces have emerged, and their diversification and irregularity bring new challenges to the innovation and development of design and construction technologies. Grid shell structures can be shaped according to the principles of structural stress, and the resulting free-form spatial grid structure is lightweight, beautiful, and technologically advanced, widely used in landmark buildings and public buildings, achieving an artistic presentation. However, it places extremely high demands on structural safety and is very difficult to implement. Compared to traditional steel grid shell structures, aluminum alloy grid shells have advantages such as lightweight and high strength, good corrosion resistance, low maintenance costs, high plasticity, and recyclability, and are developing rapidly both domestically and internationally. Because welding reduces the load-bearing capacity of aluminum alloys, aluminum alloy members in grid shell structures are usually connected mechanically. However, in irregular free-form reticulated shells, due to the need for form-finding, excessive torsion angles of the shell members and excessive folding angles of the node plates often occur. The nodes in these locations exhibit large unidirectional curvature, especially at the corners, where curvature is large in all directions. The node plates become complex in shape, no longer planar plates, but irregular curved plates. The excessive bending curvature and camber of the node plates make processing difficult and ensuring accurate hole positioning challenging, making it very difficult to use only aluminum alloy nodes. Furthermore, since the elastic modulus of aluminum alloy is approximately one-third that of steel, stability is a concern for aluminum alloy structures. Moreover, with the continuous increase in the height and span of building structures, a single system can no longer adequately meet the requirements. In aluminum alloy reticulated shell structures, steel frames or steel structure columns are often used as the substructure, forming a hybrid aluminum alloy reticulated shell-steel frame system. This effectively solves the support construction problems while optimizing the system's economy. However, research and practical application of aluminum alloy-steel hybrid structures and nodes are currently very scarce. This invention proposes a variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid node for free-form aluminum alloy grid shell-steel structures. It can effectively solve the problems of difficult positioning of members and nodes in large curvature parts of free-form aluminum alloy grid shell structures or aluminum-steel hybrid structures, difficult control of construction accuracy, and inability of the structure to cooperate in bearing forces, while meeting the requirements of structural deformation when the span is large. Summary of the Invention

[0003] This invention provides a variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid node for free-form reticulated shell structures and its construction and installation method, in order to solve the technical problems of construction difficulties in large curvature parts and structural non-coordinated stress in large-span irregular free-form reticulated shell structures.

[0004] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: a free-form reticulated shell variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid node and its construction and installation method. The variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid node includes a variable-angle upper folded plate assembly, a variable-angle lower folded plate assembly, an adjustable core reinforcement, a folded plate cover plate, a series of aluminum alloy rods, a series of steel rods, aluminum alloy special stainless steel ring groove rivets, aluminum alloy reinforcing clamps, annular support plates, cross-shaped support plates, and circumferential short stiffening ribs, etc.

[0005] Furthermore, both the variable-angle upper and lower folding plate assemblies are welded from single steel plates of different sizes. Each steel plate is not on the same plane, and the folding angle can be adjusted according to the axes of the various members of the freeform reticulated shell structure. The thickness of each steel plate is the maximum thickness of the steel member flange and not less than 2 / 3 of the aluminum member flange thickness (maximum thickness + 2mm). All welds within the folding plate assemblies are factory welded.

[0006] Furthermore, each single steel plate is connected to only one steel rod or aluminum alloy rod, wherein the single steel plate of the variable angle upper folding plate assembly is connected to the upper flange of the steel rod or aluminum alloy rod, and the single steel plate of the variable angle lower folding plate assembly is connected to the lower flange of the steel rod or aluminum alloy rod.

[0007] Furthermore, the steel member is generally of I-shaped or box-shaped cross-section, and stiffening ribs are symmetrically welded to the upper and lower flanges of the steel member to enhance the rigidity of the steel member and the node connection.

[0008] Furthermore, when connecting the individual steel plates of the variable-angle folding plate assembly to the aluminum alloy rods, holes need to be drilled in the corresponding steel plates. Simultaneously, holes also need to be drilled in the upper and lower flanges of the aluminum alloy rods. The individual steel plates and aluminum alloy rods are connected using special stainless steel ring groove rivets for aluminum alloys. When connecting the individual steel plates to the steel rods, it is not necessary to drill holes in the corresponding steel plates; the steel rods can be directly welded onto the corresponding steel plates.

[0009] Furthermore, the adjustable core reinforcement consists of a core reinforcing steel round tube and variable-angle shear stiffening ribs, with the variable-angle shear stiffening ribs welded onto the core reinforcing steel round tube.

[0010] Furthermore, the adjustable core reinforcement is welded between the variable-angle upper folding plate assembly and the variable-angle lower folding plate assembly. At least two thick partitions are installed inside the core reinforcement round steel tube, and the number of partitions can be increased according to changes in the length of the core reinforcement round steel tube. After the core reinforcement round steel tube is welded to the variable-angle upper folding plate assembly and the variable-angle lower folding plate assembly, a folding plate cover is welded horizontally at the junction.

[0011] Furthermore, variable-angle shear stiffeners are welded onto the core reinforcing round steel pipe. These variable-angle core shear stiffeners can be folded up and down, with the folding angle adjusted according to the angle of the plates within the folding plate assembly, and consistent with the plate changes. The thickness of the variable-angle core shear stiffener is one-third of the thickness of the folding plate plate, and generally not less than 8mm.

[0012] Furthermore, at the edge nodes where the aluminum alloy freeform reticulated shell structure connects to the steel frame, the upper and lower variable-angle folding plate assemblies can be configured with different shapes according to the changes in the curved surface and edge curves. The number of individual steel plate segments can also be adjusted reasonably according to the number of edge members. Aluminum alloy reinforcing plates are installed between the aluminum alloy members at this edge node. The aluminum alloy reinforcing plates are connected to the aluminum alloy members using special stainless steel ring groove rivets. The fabrication of the aluminum alloy reinforcing plates can fully utilize the advantage of easy extrusion of aluminum alloy, and the included angle can be adjusted accordingly with the included angle of the connecting members. At the edge nodes where the aluminum alloy freeform reticulated shell structure connects to the steel frame, short stiffening ribs are installed at the connection points between the variable-angle upper and lower folding plate assemblies and the edge steel frame.

[0013] Furthermore, in certain situations, due to factors such as member dimensions or structural calculations, when the thickness of each plate in the variable-angle upper and lower folding plate assembly is relatively thin, an annular support plate or a cross-shaped support plate can be vertically welded to the central area of ​​the folding plate assembly. The annular support plate or cross-shaped support plate is welded to the upper surface of the upper component plate and the lower surface of the lower component plate.

[0014] Furthermore, when the bending angle of the members is large, causing misalignment between some plates, short circumferential stiffeners are installed for reinforcement. These short circumferential stiffeners are vertically welded to the weld between the two plates, and their dimensions are determined based on the difference in misalignment between the plates. The short circumferential stiffeners are welded to the upper surface of the upper component plate and the lower surface of the lower component plate, depending on the operating space.

[0015] Fabrication and high-precision installation method of adjustable angle folded plate splicing steel-aluminum alloy hybrid node:

[0016] Step 1: First, the components, aluminum alloy rods, and steel rods of each part are manufactured in the factory. The number and size of each plate in the variable-angle upper folding plate assembly and the variable-angle lower folding plate assembly are determined by the number of rods, and whether drilling is required depends on the rods being connected. If the connecting parts are aluminum alloy rods, the corresponding connecting plates are drilled; if the connecting parts are steel rods, drilling is not required.

[0017] Step Two: Welding of the inner plates of the variable-angle upper and lower folding plate assemblies. The calculation method for the weld dimensions of each plate in the variable-angle upper and lower folding plate assemblies is as follows: Using the intersection center of each member as the center, draw circles with a radius of 50mm at intervals. Cut the thickness dimension of each plate according to the circular trajectory. Simultaneously, based on the included angle variable between the axes of the connecting members and the thickness of each steel plate in the assembly, batch calculations are performed through the design platform to obtain the weld dimensions at each circular trajectory line. If, after calculation, misalignment of plates occurs at a position far from the center of the folding plate assembly, a circumferential support plate is welded after the installation node. The dimensions of this circumferential support plate are determined based on the misalignment difference between the plates. After welding the plates according to the weld dimensions, the variable-angle upper folding plate assembly is formed. The variable-angle lower folding plate assembly is welded in the same way.

[0018] Step 3: Weld the two variable-angle folding plate assemblies to the upper and lower ends of the adjustable core reinforcement, respectively. Then, horizontally weld the folding plate cover plates to the upper and lower ends of the adjustable core reinforcement. All welding is completed in the factory.

[0019] Step Four: During structural construction, first weld and fix the supports, columns, and surrounding steel ring beam frame. After assembling the internal aluminum alloy mesh shell structure, assemble the variable-angle adjustable folding plate splicing steel-aluminum alloy hybrid at the joint of the hybrid structure. Specifically: First, connect the aluminum alloy members to the upper and lower components of the variable-angle folding plate at the nodes using stainless steel ring groove rivets. The steel members at the connection with the surrounding steel ring beam frame are welded after on-site measurement, dimensional error calculation, and adjustment to eliminate the overall offset error of the mesh shell structure. Real-time measurement is required during installation to ensure the accurate spatial position of each component. By reasonably setting the installation sequence from the inside to the outside, the cumulative error during the installation process is eliminated.

[0020] The freeform reticulated shell structure variable angle adjustable folded plate steel-aluminum alloy hybrid node and its construction and installation method provided by this invention have at least the following advantages compared with existing systems and nodes:

[0021] (1) It overcomes the shortcomings of traditional single aluminum alloy plate nodes, such as low stiffness and inability to be welded;

[0022] (2) The variable angle folded plate of this node can be bent into a certain angle according to the curvature requirements, which effectively solves the problems of difficulty in positioning members and nodes in the large curvature part of free-form aluminum alloy mesh shell structure or aluminum-steel hybrid structure, difficulty in controlling construction accuracy, and inability of hybrid structure to cooperate in bearing force, while meeting the requirements of structural deformation when the span is large.

[0023] (3) Each steel plate is not in a plane. The upward folding angle of each plate is determined by the axis angle of the connected component. Therefore, it can be freely adjusted. The degree of freedom of node connection is higher and is not limited by the curvature of the free surface of the structure.

[0024] (4) The installation and construction method is reasonable. It starts with the splicing of internal nodes. After the splicing of internal nodes is completed, the steel components of the edge nodes can be adjusted according to the on-site measurement dimensions and then welded to the steel-aluminum alloy hybrid nodes and steel ring beam structure, which can effectively eliminate the cumulative error of the overall offset of the grid shell structure. Attached Figure Description

[0025] Figure 1 A schematic diagram showing the splitting of a variable-angle adjustable folding plate steel-aluminum alloy hybrid node;

[0026] Figure 2 Example of calculating the weld dimensions of each plate component in a variable angle folding plate assembly;

[0027] Figure 3 This is a plan view of the variable-angle upper folding plate assembly for implementation method 1;

[0028] Figure 4 This is a plan view of the variable-angle downward folding plate assembly for implementation method 1;

[0029] Figure 5 This is a cross-sectional view (1-1) in Implementation Method 1;

[0030] Figure 6 This is a cross-sectional view (2-2) in Implementation Method 1;

[0031] Figure 7 This is a cross-sectional view (3-3) in Implementation Method 1;

[0032] Figure 8 The diagram shows the cross-section of the steel member and the stiffening ribs of the steel member in Implementation Method 1;

[0033] Figure 9 This is a plan view of the variable-angle upper folding plate assembly for implementation method 2;

[0034] Figure 10 This is a plan view of the variable-angle downward folding plate assembly for implementation method 2;

[0035] Figure 11 This is a cross-sectional view (1-1) in embodiment 2;

[0036] Figure 12 This is a cross-sectional view 2-2 in embodiment 2;

[0037] Figure 13 This is a plan view of the variable angle upper folding plate assembly in embodiment 3;

[0038] Figure 14This is a plan view of the variable angle downward folding plate assembly in embodiment 3;

[0039] Figure 15 This is a cross-sectional view (1-1) in embodiment 3;

[0040] Figure 16 Plan view of the variable angle upper folding plate assembly for implementation method 4;

[0041] Figure 17 This is a plan view of the variable-angle downward folding plate assembly for implementation method 4;

[0042] Figure 18 A 3D model of an aluminum alloy reinforced plywood;

[0043] Figure 19 Method 1: Reinforcement of thin plates with variable angle upper and lower folds;

[0044] Figure 20 Schematic diagram of short stiffening ribs for reinforcement;

[0045] Figure 21 Method 2: Reinforcement of thin plates with variable angle upper and lower folds;

[0046] Figure 22 Schematic diagram of a cross-shaped reinforcing plate;

[0047] The numbers on the map are:

[0048] 1- Variable angle upper folding plate assembly; 111- Weld between plates; 11~17- Folding steel plates, which are divided into those with bolt holes and those without bolt holes. Plates without bolt holes are connected to steel components, and plates with bolt holes are connected to aluminum alloy components.

[0049] 2- Variable angle downward folding plate assembly; 21~27- Component plates, corresponding one-to-one with 11~17 in the variable angle upward folding plate assembly. These are divided into those with bolt holes and those without bolt holes; plates without bolt holes connect to steel components, while plates with bolt holes connect to aluminum alloy components.

[0050] 3-Adjustable core reinforcement; 31-Variable angle shear stiffening rib; 32-Core reinforcing steel round tube; 33-Thick partition plate;

[0051] 4-Aluminum alloy rods; including 41 to 45, with I-shaped or box-shaped cross-sections, as required by the design;

[0052] 5-Steel members; including 51 to 56, which are I-shaped or box-shaped sections, set according to design requirements; 57-Transition section steel members; 58-Edge steel ring beam skeleton;

[0053] 6-Stiffening ribs for steel members; 61-Short stiffening ribs on the upper flange of I-beam steel members at nodes; 62-Short stiffening ribs on the lower flange of I-beam steel members at nodes; 63-Short stiffening ribs on the upper flange of I-beam steel members at variable cross-sections; 64-Short stiffening ribs on the lower flange of I-beam steel members at variable cross-sections; 65-Stiffening ribs for box-section sections at nodes; 66-Stiffening ribs for box-section sections at variable cross-sections; 67-Short stiffening ribs at edge nodes;

[0054] 7-Folded cover plate; 8-Aluminum alloy special stainless steel ring groove rivet;

[0055] 91-Circular support plate; 92-Circular stiffening plate; 93-Cross-shaped support plate;

[0056] 10-Aluminum alloy reinforced plywood; Detailed Implementation

[0057] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0058] Figure 1 This is a schematic diagram of a variable-angle adjustable folding plate splicing steel-aluminum alloy hybrid node. The variable-angle adjustable folding plate splicing steel-aluminum alloy hybrid node consists of a variable-angle upper folding plate assembly 1, a variable-angle lower folding plate assembly 2, and an adjustable core reinforcement 3. The variable-angle upper folding plate assembly 1 and the variable-angle lower folding plate assembly 2 are welded to the upper and lower ends of the adjustable core reinforcement 3. The variable-angle folding plate assembly 1 is welded from different steel plates 11 to 16, and all welds 111 within the folding plate assembly are factory welded. The number of plates is determined by the number of connected rods and is not limited to 11 to 16; the dimensions can be cut according to the required dimensions of the connected rods. Each steel plate 11 to 16 is not in a single plane, and the folding angle of each plate is determined by the angle of the axis of the connected rod, which can be adjusted according to the axes of the rods in the freeform reticulated shell structure. The thickness of each steel plate is the thickest thickness of the flange of the steel rod 5, and not less than 2 / 3 of the flange thickness (maximum thickness + 2mm) of the aluminum alloy rod 4.

[0059] Specifically, the variable angle lower folding plate assembly 2 is welded from different steel plates 21 to 26, which correspond one-to-one with the plates of the variable angle upper folding plate assembly 1, and the folding angle is also determined by the angle of the axis of the connected rod.

[0060] Specifically, each of the individual steel plates 11-16 (21-26) is connected to only one aluminum alloy rod 4 or one steel rod 5. The individual steel plates 11-16 of the variable-angle upper folding plate assembly 1 are connected to the upper flange of the steel rod 5 or the aluminum alloy rod 4, and the individual steel plates 21-26 of the variable-angle lower folding plate assembly 2 are connected to the lower flange of the steel rod 5 or the aluminum alloy rod 4. When connecting the individual steel plates 11-16 (21-26) to the aluminum alloy rod 4, holes need to be drilled in the corresponding individual steel plates 11-16, and holes also need to be drilled in the upper and lower flanges of the aluminum alloy rod 4. The connection is made using aluminum alloy-specific stainless steel ring groove rivets 8. When connecting the individual steel plates 11-16 (21-26) to the steel rod 5, it is not necessary to drill holes in the individual steel plates 11-16 (21-26); the steel rod 5 is directly welded.

[0061] Specifically, the adjustable core reinforcement 3 is welded between the variable-angle upper folding plate assembly 1 and the variable-angle lower folding plate assembly 2. The adjustable core reinforcement 3 consists of a variable-angle core shear stiffening rib 31, a core reinforcing round steel tube 32, and thick partition plates 33. The core reinforcing round steel tube 32 contains at least two 33-thickness partition plates, the number of which can be increased according to the length of the core reinforcing round steel tube 32. After the core reinforcing round steel tube 32 is welded to the variable-angle upper folding plate assembly 1 and the variable-angle lower folding plate assembly 2, a folding plate cover plate 7 is horizontally welded at the junction.

[0062] Specifically, a variable-angle shear stiffening rib 31 is welded onto the core reinforcing round steel pipe 32. This variable-angle core shear stiffening rib 31 can be folded up and down, and the folding angle is adjusted accordingly with the angle of the single plate 11 to 16 (21 to 26) within the variable-angle folding plate assembly 1 (2), and is consistent with the change of the single plate. The thickness of the variable-angle core shear stiffening rib 31 is 1 / 3 of the thickness of the folding plate 11 to 16 (21 to 26), and is generally not less than 8 mm.

[0063] Figure 2 Example of calculating the weld dimensions 111 for each plate in the upper and lower variable angle folding plate assembly: Using the intersection center of each member as the center, draw circles with a radius of 50mm. Cut the dimensional differences in the thickness directions of different plates according to the circular trajectory. Simultaneously, based on the included angle variables between the axes of the connecting members and the thickness of each steel plate in the assembly, obtain the weld dimensions 111 at each ring in batches through the design platform. If, after calculation, misalignment occurs at a position far from the center of the folding plate assembly, a circumferential support plate is vertically welded to this position after the installation node. The dimensions of this circumferential support plate are determined based on the misalignment difference between the plates.

[0064] Figures 3-8 Implementation method one:

[0065] Implementation method one involves using a variable-angle adjustable folding plate splicing steel-aluminum alloy hybrid node to connect I-beam steel members 51, 53, and 54, box-type steel members 52 and 55, and aluminum alloy members 4. The variable-angle upper folding plate assembly 1 and the variable-angle lower folding plate assembly 2 can be cut and welded according to the number and size of the connecting members. The two assemblies are welded to the upper and lower ends of the adjustable core reinforcement 3. In this implementation method, the number of aluminum alloy members 4 is relatively small, and most are steel members 5, so the node stiffness is relatively large. The variable-angle core shear stiffening rib 31 in the adjustable core reinforcement 3 can be omitted, and only the core reinforcing round steel pipe 32 is required.

[0066] Aluminum alloy member 4 is I-shaped with holes drilled in the upper and lower flanges, and corresponding holes drilled in the corresponding component steel plates. It is connected with aluminum alloy special stainless steel ring groove rivets 8. The plates connecting steel member 5 do not require holes. Due to the limited operating space of the component steel plates, box-section steel members 52 and 55 need to be welded with transition section steel members 57. Box-section stiffening ribs 65 are welded at the joints where they connect with the variable angle folding plate component, and box-section stiffening ribs 66 are welded at the variable cross-section locations.

[0067] For I-beam steel members 51, 53, and 54, the web plates can be directly welded vertically to the variable-angle upper folding plate assembly 1 and the variable-angle lower folding plate assembly 2. At the junction with the nodes, short stiffening ribs 61 on the upper flange and 62 on the lower flange of the I-beam steel members at the nodes are welded vertically. At the variable cross-section locations, short stiffening ribs 63 on the upper flange and 64 on the lower flange of the I-beam steel members at the variable cross-section locations are welded to enhance the stiffness of the members and the node connections. Figure 8 As shown.

[0068] Specifically, the deflection angles of the connecting node members are all determined by calculation based on the structural layout and the axis deflection angles of the connected members, such as... Figures 5-7 As shown.

[0069] Figures 9-12 Implementation method two:

[0070] Implementation method two involves using a variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid node to connect the I-beam steel member 56 and the aluminum alloy members 41, 42, and 43. Due to the large number of connected aluminum alloy members and the high requirement for node stiffness, a variable-angle core shear stiffening rib 31 in the adjustable core reinforcement member 3 is required, such as... Figures 9-10 As shown. The dimensions and deflection angle of the variable-angle core shear stiffener 31 are adjusted according to the plate angles of the variable-angle upper folding plate assembly 1 and the variable-angle lower folding plate assembly 2. The specific number of variable-angle core shear stiffeners 31 can be adjusted according to the stiffness requirements calculated at the nodes.

[0071] Figures 13-15 Implementation method three:

[0072] Implementation method three is the edge area connection method of the aluminum alloy freeform surface shell structure and the steel ring beam skeleton. In this implementation method, two aluminum alloy rods 44 and 45 and one steel rod 56 are connected. In this implementation method, the variable angle upper and lower folding plate assembly 1(2) can be set to different shapes according to the needs of the curved surface and the convenience of edge area connection. The number of single steel plate plates can also be reasonably adjusted according to the number of edge rods.

[0073] Because the adjustable core reinforcement 3 at the edge would cause inconvenience in connecting with the edge steel ring beam skeleton 58 and restrict the operating space, the upper and lower variable angle folding plate assemblies 1(2) are directly welded to the edge ring beam steel skeleton 58, and short stiffening ribs 67 at the edge nodes are added. An aluminum alloy reinforcing clamp 10 is set between the aluminum alloy rods 44 and 45, such as Figure 17 As shown. The aluminum alloy reinforcing clamp 10 is connected to the aluminum alloy rod 4 by aluminum alloy special stainless steel ring groove rivets 8. The aluminum alloy reinforcing clamp 10 can make full use of the advantage of easy extrusion of aluminum alloy, and the included angle can be adjusted accordingly with the included angle of the connecting rod.

[0074] Figures 16-17 Implementation method four:

[0075] Implementation method four involves an edge region connection between the aluminum alloy freeform reticulated shell structure and the steel frame. In this implementation, all connecting members are aluminum alloy members, resulting in lower connection strength and stiffness. Therefore, aluminum alloy reinforcing plates 10 are installed between aluminum alloy members 44, 45, and 46. Figure 18 As shown.

[0076] Specifically, at the edge node where the aluminum alloy freeform mesh shell structure connects to the steel frame, an edge node short stiffening plate 67 is provided at the connection between the upper and lower variable angle folding plate assembly 1(2) and the edge steel frame 58.

[0077] Figures 19-22 Implementation method five:

[0078] Implementation method five describes the node reinforcement measures. Specifically, in some cases, due to factors such as member size or structural calculations, if the thickness of the upper and lower variable angle folding plate assembly plates 1(2) is relatively thin, misalignment will occur at a distance from the member intersection center when the plates are folded. Alternatively, a large member folding angle may also cause misalignment between some plates. In this case, a short circumferential stiffening rib 92 is vertically welded to the edge area of ​​the node. The short circumferential stiffening rib 92 is vertically welded to the plate, and its size is determined according to the misalignment difference between the plates. At the same time, an annular support plate 91 or a cross-shaped support plate 93 is vertically welded to the center area of ​​the folding plate assembly. The annular support plate 91 or the cross-shaped support plate 93 is welded to the upper surface of the upper assembly plate and the lower surface of the lower assembly plate, depending on the operating space.

Claims

1. A free-form reticulated shell variable-angle adjustable folded plate splicing steel-aluminum alloy hybrid node, characterized in that, include: The variable angle upper folding plate assembly (1) and the variable angle lower folding plate assembly (2) are respectively welded from multiple single steel plates that are not in the same plane. The folding angle of each single steel plate is adjusted according to the axial angle of the connected rod. An adjustable core reinforcement (3) is welded between the variable angle upper folding plate assembly (1) and the variable angle lower folding plate assembly (2). The adjustable core reinforcement (3) consists of variable angle shear stiffening ribs (31), a core reinforcing steel tube (32), and thick partitions (33). The variable angle shear stiffening ribs (31) are welded to the core reinforcing steel tube (32). At least two thick partitions (33) are spaced apart along the axial direction inside the core reinforcing steel tube (32). The multiple variable angle shear stiffening ribs (31) are distributed circumferentially along the core reinforcing steel tube (32) and are welded to the outer wall of the core reinforcing steel tube (32). The variable angle shear stiffening rib (31) can be folded up and down. The folding angle is adjusted according to the angle and size of the plate inside the variable angle upper folding plate assembly (1) or the variable angle lower folding plate assembly (2), and is consistent with the plate change. After the core reinforcing steel round tube (32) is welded to the variable angle upper folding plate assembly (1) and the variable angle lower folding plate assembly (2), the folding plate cover plate (7) is welded horizontally at the junction.

2. The freeform reticulated shell variable angle adjustable folded plate splicing steel-aluminum alloy hybrid node according to claim 1, characterized in that, Each plate in the variable angle upper folding plate assembly (1) and the variable angle lower folding plate assembly (2) is connected to only one steel rod or one aluminum alloy rod. The plates connecting the steel rods are connected to the steel rods by welding; the plates connecting the aluminum alloy rods are connected to the aluminum alloy rods by aluminum alloy special stainless steel ring groove rivets (8).

3. The freeform surface reticulated shell variable angle adjustable folded plate splicing steel-aluminum alloy hybrid node according to claim 1, characterized in that, When the thickness of the plates in the variable angle upper and lower folding plate assembly is thin or the bending angle of the rod is large, resulting in misalignment between the plates, an annular support plate (91) or a cross-shaped support plate (93) is vertically welded in the central area of ​​the folding plate assembly, and a circumferential short stiffening rib (92) is vertically welded at the edge of the folding plate assembly.

4. The freeform reticulated shell variable angle adjustable folded plate splicing steel-aluminum alloy hybrid node according to claim 1, characterized in that, In the variable angle upper folding plate assembly (1) and variable angle lower folding plate assembly (2), the weld size between each plate is determined by the following method: taking the intersection of each rod as the center, draw concentric circles with a radius of 50mm every 50mm, cut out the thickness dimension of each plate according to the circular trajectory, and at the same time, according to the included angle variable between the axes of each connecting rod and the thickness of each plate of the assembly, the weld size at each circular trajectory line is obtained by batch calculation through the design platform.

5. The freeform reticulated shell variable angle adjustable folded plate splicing steel-aluminum alloy hybrid node according to any one of claims 1 to 4, characterized in that, The welding of each component in the node is prefabricated in the factory.

6. The freeform reticulated shell variable angle adjustable folded plate splicing steel-aluminum alloy hybrid node according to claim 1, characterized in that, When installing this node, first connect the aluminum alloy rod to the node variable angle upper folding plate assembly (1) and variable angle lower folding plate assembly (2) using aluminum alloy special stainless steel ring groove rivets (8).

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