Buckling-restrained brace connecting plate with opening and closing function

Abstract

The present invention discloses a buckling-resistance brace connecting plate with opening and closing, which belongs to the field of civil engineering technology. The connecting plate includes a first node plate, a second node plate, a screw, a disc spring, a nut and a low-friction material. The first node plate is provided with an arc-shaped guide groove and is connected to the beam end, the second node plate is provided with a screw hole and is connected to the column end, the buckling-resistance brace connecting end is provided with a screw hole, and low-friction material is placed on both sides of the connecting section. The screw passes through the screw hole of the second node plate, the screw hole of the buckling-resistance brace connecting end and the arc-shaped guide groove of the first node plate in sequence to connect and fix. The connecting plate can effectively solve the node rigidity problem and the opening and closing effect problem existing in the connection between the traditional buckling-resistance brace and the steel frame, avoid premature damage of the node, and ensure that the buckling-resistance brace performance is fully exerted.

Description

Technical Field

[0001] The present invention belongs to the technical field of civil engineering, and in particular relates to a buckling-restrained brace connecting plate with opening and closing functions. Background Art

[0002] Over the past decade, buckling-restrained bracing (BSR) technology has garnered widespread attention and application within both domestic and international academic and engineering communities, particularly in multi-story buildings. Because steel frames have limited lateral stiffness and are subject to significant lateral displacement during earthquakes, the placement of BSRs within steel frames can effectively improve the overall lateral stiffness of the structural system. Compared to conventional braces, BSRs resist buckling under compression and exhibit excellent ductility and stable hysteretic properties. Under earthquake conditions, they form a dual lateral stiffness system with the steel frame, ensuring the safety of the entire structure.

[0003] Domestic and foreign studies have found that the connection node between the anti-buckling brace and the steel frame is the main factor affecting the performance of the anti-buckling brace in the frame. In order to give full play to the shock-absorbing and energy-absorbing effects of the anti-buckling brace, it is necessary to ensure the performance of the connection node between the anti-buckling brace and the steel frame to avoid premature damage to the node, thereby ensuring the principle of "strong nodes, weak components". Traditional anti-buckling brace connection plates connect the node plates to steel beams and columns by welding, but the rigid domain problem and the beam-column opening and closing effect at the node plates will cause the node plates or beam-column components to be damaged before the anti-buckling brace, resulting in the anti-buckling brace failing to give full play to its excellent energy-absorbing capacity. In view of this, the present invention proposes an anti-buckling brace connection plate with opening and closing, which has outstanding advantages and broad application prospects. Summary of the Invention

[0004] In view of this, the present invention provides a buckling-restrained brace connecting plate with an opening and closing function, which can solve the node rigidity problem and opening and closing effect problem existing in the connection between the traditional buckling-restrained brace and the steel frame, avoid premature damage of the node, and ensure that the buckling-restrained brace performance is fully utilized.

[0005] A buckling-resistance brace connecting plate with opening and closing, the connecting plate comprising a first node plate, a second node plate, a screw, a disc spring, a nut and a low-friction material; the first node plate is provided with an arc-shaped guide groove and is connected to the beam end of the steel frame, the second node plate is provided with a screw hole and is connected to the column end of the steel frame, the buckling-resistance brace connecting end is provided with a screw hole, and low-friction material is placed on both sides of the connecting section; the screw passes through the screw hole of the second node plate, the screw hole of the buckling-resistance brace connecting end and the arc-shaped guide groove of the first node plate in sequence and is connected and fixed by a disc spring and a nut.

[0006] Furthermore, the first node plate is welded to the steel beam through a fillet weld and leaves a gap with the steel column, and the second node plate is welded to the steel column through a fillet weld and leaves a gap with the steel beam.

[0007] Furthermore, the first node plate is provided with three arc-shaped guide grooves, and the arc-shaped guide grooves are clearance-fitted with the screw rods. The clearance-fitting requires that the width of the arc-shaped guide grooves of the first node plate is greater than or equal to the diameter of the screw rods; the second node plate is provided with a screw rod hole, and the screw rod hole is aligned with the arc-shaped guide grooves of the first node plate; the anti-buckling support connection end is provided with a screw rod hole.

[0008] Furthermore, the first node plate is composed of a mounting plate and two parallel connecting plates arranged on the mounting plate, the two connecting plates are connecting plate No. 1 and connecting plate No. 2, and three arc-shaped guide grooves are respectively provided on connecting plate No. 1 and connecting plate No. 2; and mounting holes are provided on the mounting plate.

[0009] Furthermore, the second node plate is composed of a mounting plate and a connecting plate, and the mounting plate and the connecting plate are respectively provided with mounting holes and screw holes.

[0010] Furthermore, the connection end of the anti-buckling support is set as a U-shaped port, and the U-shaped port forms two parallel connecting plates, which are U-shaped port No. 1 connecting plate and U-shaped port No. 2 connecting plate respectively. The U-shaped port No. 1 connecting plate and the U-shaped port No. 2 connecting plate have the same number of screw holes; an inclination angle is set at the transition part of the anti-buckling support; and low-friction material is placed on the outside of the U-shaped port.

[0011] Furthermore, the first node plate is fixed by bolts and nuts after being aligned with the positioning holes on the steel beam through the mounting holes of the mounting plate; the second node plate is fixed by nuts and disc springs after being aligned with the positioning holes on the steel column through the mounting holes on the mounting plate.

[0012] Furthermore, the screw passes through the arc guide groove of the No. 1 connecting plate of the first node plate, the screw hole of the No. 1 connecting plate of the U-shaped port, the screw hole of the second node plate, the screw hole of the No. 2 connecting plate of the U-shaped port and the arc guide groove of the No. 2 connecting plate of the first node plate, and then is put through the disc spring and the nut in sequence, and is tightened and fixed with a torque wrench; a disc spring is padded between the nut and the node plate, and the nut is tightened with a torque wrench to apply a pre-tightening force to the nut. The nut will squeeze the disc spring, so that the first node plate, the anti-buckling support structure and the second node plate are in close contact to form a whole.

[0013] Beneficial effects:

[0014] 1. The first node plate of the present invention is provided with an arc-shaped guide groove and is connected to the beam end of the steel frame, the second node plate is provided with a screw hole and is connected to the column end of the steel frame, the anti-buckling support connection end is provided with a screw hole, the screw passes through the screw hole of the second node plate, the screw hole of the anti-buckling support connection end and the arc-shaped guide groove of the first node plate in sequence, and is connected and fixed by a disc spring and a nut. Compared with the traditional anti-buckling support node plate, the present invention can solve the rigid domain problem and opening and closing effect existing at the beam-column node, and avoid the node from being damaged before the anti-buckling support.

[0015] 2. The arc-shaped guide groove provided in the first node plate of the present invention is clearance-fitted with the screw, wherein the clearance-fit requires that the width of the arc-shaped guide groove of the first node plate is greater than or equal to the diameter of the screw, allowing the screw to slide a certain amount relative to the first node plate, which is beneficial to reducing the influence of the opening and closing effect on the node structure.

[0016] 3. The first node plate of the present invention is welded to the steel beam through a fillet weld and leaves a gap with the steel column. The second node plate is welded to the steel column through a fillet weld and leaves a gap with the steel beam. Compared with the existing connection plate that is only connected to the beam (or column), the present invention disperses the supporting axial force on the beam and column through the action of bolts, preventing the node plate from being connected to the beam (or column) alone, and preventing the beam end (or column end) from being damaged before the anti-buckling support and the node due to the excessive axial force it bears alone.

[0017] 4. The present invention provides an arc-shaped guide groove on the first node plate and places low-friction material on both sides of the anti-buckling support connection end. The low-friction material can reduce the slip friction between the first node plate, the second node plate and the anti-buckling support connection end. Even if there is a strong opening and closing effect at the beam-column node, the present invention can still function effectively to ensure that the anti-buckling support performance is fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall connection structure diagram of the buckling restrained brace and the steel frame;

[0019] Figure 2 This is a front view of the second node plate of the first embodiment of the present invention;

[0020] Figure 3 This is a rear view of the first node plate of the first embodiment of the present invention;

[0021] Figure 4 This is an exploded diagram of a node structure of an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the connection end of the buckling-restrained brace according to the second embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the first node plate of the second embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the second node plate of the second embodiment of the present invention;

[0025] Figure 8 This is a front view of the first node plate of the second embodiment of the present invention;

[0026] Figure 9 This is the rear view of the first node plate of the second embodiment of the present invention

[0027] Figure 10 It is an exploded diagram of the node structure of the second embodiment of the present invention.

[0028] Reference numerals:

[0029] Among them: 1-steel beam, 2-steel column, 3-buckling-resistance brace, 4-stiffening rib, 5-node structure, 6-case 1 first node plate, 7-case 1 second node plate, 8-case 1 screw, 9-case 1 nut, 10-case 1 disc spring, 11-case 1 arc guide groove, 12-case 1 screw hole, 13-case 1 buckling-resistance brace connection end, 14-case 1 buckling-resistance brace connection end screw hole, 15-case 1 low friction material (such as butyl rubber), 16-case 1 buckling-resistance brace transition part, 18-case 2 first node plate, 18-1-case 2 first node plate No. 1 connection plate, 1 8-2 Case 2 first node plate No. 2 connecting plate, 19-Case 2 second node plate, 20-Case 2 screw, 21-Case 2 nut, 22-Case 2 disc spring, 23-Case 2 arc guide groove, 24-Case 2 screw hole, 25-Case 2 anti-buckling support connection end (U-shaped port), 25-1-U-shaped port No. 1 connecting plate, 25-2-U-shaped port No. 2 connecting plate, 26-Case 2 anti-buckling support connection end screw hole, 27-Case 2 low friction material, 28-Case 2 anti-buckling support transition part, 29-Case 2 bolt, 30-Case 2 mounting hole, 31-Case 2 positioning hole. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0031] Implementation Case 1:

[0032] like Figure 1 The figure shows a specific embodiment of the present invention, wherein a buckling-resistance brace connecting plate with opening and closing is applied to a buckling-resistance braced steel frame. In this embodiment, the structure is mainly divided into three parts: a steel frame, buckling-resistance brace members, and a node structure between the ends of beams and columns and the ends of buckling-resistance braces (hereinafter referred to as the node structure). Figure 1 It is the overall connection structure diagram of the buckling restrained brace and the steel frame; Figure 2 This is a front view of the second node plate of the first embodiment of the present invention; Figure 3This is the rear view of the first node plate of implementation case 1; Figure 4 This is an exploded diagram of a node structure in an embodiment of the present invention. Figure 1 The upper left node is referred to as node 1, and the lower right node is referred to as node 2. Figure 1 As shown, a first-class steel frame consists of H-shaped steel beams and columns. The H-shaped steel beams are composed of upper flange plates, lower flange plates, and web plates. The H-shaped steel columns are composed of upper flange plates, lower flange plates, web plates, and stiffening ribs. The steel beams and columns can be fabricated in a factory, and the stiffening ribs are welded to the columns in the factory.

[0033] like Figure 2 As shown, the second gusset plate 7 is connected to the anti-buckling brace 3 and the first gusset plate 6 by screws, nuts and disc springs, and is tightened and fixed with a torque wrench. A certain gap is left between the second gusset plate 7 and the steel beam 1.

[0034] like Figure 3 As shown, the first node plate 6 is connected to the anti-buckling brace 3 and the second node plate 7 by screws, nuts and disc springs, and is tightened and fixed with a torque wrench. A certain gap is left between the first node and the steel column 2.

[0035] like Figure 4 As shown, a layer of low-friction material 15, such as butyl rubber, is placed on both sides of the anti-buckling brace 3 to reduce the opening and closing friction between the first and second node plates 6, 7 and the anti-buckling brace connection ends 13 while reducing the adverse effects of the opening and closing effect on the node plates.

[0036] In order to fully consider the diffusion of the axial force of the anti-buckling brace at the support end, a certain inclination angle is set at the transition portion 16 of the anti-buckling brace.

[0037] like Figure 1 、 2 As shown in , 3 and 4 , the node structure mainly includes a first node plate 6, a second node plate 7, a screw 8, a nut 9 and a disc spring 10.

[0038] Specifically, the first node plate 6 and the second node plate 7 are both perpendicular to the beam column and parallel to the anti-buckling support member. The first node plate 6 is welded to the steel beam 1 by a fillet weld. In order to eliminate the rigid domain effect and the opening and closing effect, a certain gap is left between the first node plate 6 and the steel column 2. The second node plate is welded to the steel column 2 by a fillet weld. In order to eliminate the rigid domain effect and the opening and closing effect, a certain gap is left between the first node plate 6 and the steel beam. The first node plate 6 is arranged on the lower surface of the anti-buckling support connection end 13, and the second node plate 7 is arranged on the upper surface of the anti-buckling support connection end 13. The first node plate 6 is provided with three arc-shaped guide grooves, which are clearance-fitted with the screw rods; the second node plate 7 is provided with six screw rod holes, which are aligned with the arc-shaped guide grooves of the first node plate 6. The anti-buckling support connection end 13 is provided with six screw rod holes, which are aligned with the arc-shaped guide grooves of the first node plate 6. During assembly, the screw rods are passed through the second node plate, the anti-buckling support connection end 13 and the first node plate in sequence, and aligned with the arc-shaped guide grooves, and the two ends are tightened and fixed with nuts. A disc spring 10 is placed between the nut 9 and the gusset plate. Tightening the nut 9 with a torque wrench applies a preload to the nut 9, which compresses the disc spring 10, ensuring close contact between the first gusset plate 6, the buckling restraint structure, and the second gusset plate 7, forming a single unit.

[0039] During installation, first, the first node plate 6 and the second node plate 7 at the node 1 are welded to the steel beam 1 and the steel column 2 respectively through fillet welds, wherein a certain gap is left between the first node plate 6 and the steel column 2, and a certain gap is left between the second node plate 7 and the steel beam 1; the first node plate and the second node plate at the node 2 are welded to the steel beam and the steel column (based on the first floor) through fillet welds, wherein a certain gap is left between the first node plate and the steel column, and a certain gap is left between the second node plate and the steel beam (based on the first floor); then, a layer of low-friction material 15, such as butyl rubber, is placed on both sides of the two ends of the anti-buckling support; then, the anti-buckling support member on which the low-friction material is placed is moved to the corresponding At the corresponding position, at node 1, align the screw hole of the anti-buckling support connection end with the arc guide groove of the first node plate and the screw hole of the second node plate; at node 2, align the screw hole of the anti-buckling support connection end with the arc guide groove of the first node plate and the screw hole of the second node plate; finally, at node 1, pass the screw through the second node plate, the anti-buckling support connection end and the first node plate in sequence, and align them with the arc guide groove, then pass the screw through the disc spring and the nut in sequence, and tighten the nut with a torque wrench; at node 2, pass the screw through the second node plate, the anti-buckling support connection end and the first node plate in sequence, and align them with the arc guide groove, then pass the screw through the disc spring and the nut in sequence, and tighten the nut with a torque wrench.

[0040] Implementation Case 2:

[0041] Different from the embodiment of the present invention in which the node plate is welded to the steel column and the steel beam by fillet welds, the node plate is connected to the steel column and the steel beam by bolts in this embodiment. Figure 1 The figure shows a specific embodiment of the present invention, wherein a buckling-resistance brace connecting plate with opening and closing is applied to a buckling-resistance braced steel frame. In this embodiment, the structure is mainly divided into three parts: a steel frame, buckling-resistance brace members, and a node structure between the ends of beams and columns and the ends of buckling-resistance braces (hereinafter referred to as the node structure). Figure 1 It is the overall connection structure diagram of the buckling restrained brace and the steel frame; Figure 5 This is a schematic diagram of the connection end of the buckling-restrained brace according to the second embodiment of the present invention; Figure 6 This is a schematic diagram of the first node plate of the second embodiment of the present invention; Figure 7 This is a schematic diagram of the second node plate of the second embodiment of the present invention; Figure 8 This is a front view of the first node plate of the second embodiment of the present invention; Figure 9 This is a rear view of the first node plate of the second embodiment of the present invention; Figure 10 This is an exploded diagram of the node structure of the second embodiment of the present invention. Figure 1 The upper left node is referred to as Node 1, and the lower right node is referred to as Node 2.

[0042] like Figure 1 As shown, a first-class steel frame consists of H-shaped steel beams and columns. The H-shaped steel beams are composed of upper flange plates, lower flange plates, and web plates. The H-shaped steel columns are composed of upper flange plates, lower flange plates, web plates, and stiffening ribs. The steel beams and columns can be fabricated in a factory, and the stiffening ribs are welded to the columns in the factory.

[0043] like Figure 5 As shown, the buckling-resistance brace connection end 25 is configured as a U-shaped connection port, hereinafter referred to as a U-shaped port, with six screw holes on each side, for a total of 12 screw holes. To fully consider the diffusion of the buckling-resistance brace axial force at the support end, a certain angle is set at the buckling-resistance brace transition portion.

[0044] like Figure 6 As shown, unlike the first gusset plate in case 1, the first gusset plate 18 in case 2 is provided with two connecting plates, namely: first gusset plate No. 1 connecting plate 18-1 and first gusset plate No. 2 connecting plate 18-2. Each connecting plate is provided with three arc-shaped guide grooves, and 10 mounting holes are provided on the mounting plate.

[0045] like Figure 7 As shown, the second node plate 19 of this case is provided with 8 mounting holes and 6 screw holes;

[0046] like Figure 8 、 9As shown, the screw rod passes through the arcuate guide groove of the No. 1 connecting plate 18-1 of the first gusset plate 18, the screw hole of the No. 1 connecting plate 25-1 of the U-shaped port, the screw hole of the second gusset plate 19, the screw hole of the No. 2 connecting plate 25-2 of the U-shaped port, and the arcuate guide groove of the No. 2 connecting plate 18-2 of the first gusset plate 18. The disc spring and nut are then passed through and tightened with a torque wrench. The U-shaped port 25 is clamped to the second gusset plate 19 by two connecting plates, and the first gusset plate 18 is clamped to the U-shaped port 25 by two connecting plates. A certain gap is left between the first gusset plate 18 and the steel column, and a certain gap is left between the second gusset plate 19 and the steel beam.

[0047] like Figure 10 As shown, a layer of low-friction material 27, such as butyl rubber, is placed on the outer side of each anti-buckling brace to reduce the opening and closing friction between the first and second node plates 18, 19 and the anti-buckling brace connection ends while reducing the adverse effects of the opening and closing effect on the node plates.

[0048] like Figure 1 、 5 As shown in Figures 6, 7, 8, 9 and 10, the node structure mainly includes a first node plate, a second node plate, a screw, a nut, a disc spring and a bolt.

[0049] Specifically, the first node plate and the second node plate are perpendicular to the beam-column and parallel to the anti-buckling support member. High-strength bolts are successively passed through the mounting holes of the first node plate and the positioning holes on the steel beam, and fixed with nuts and disc springs to form a reliable connection. In order to eliminate the rigid domain effect and the opening and closing effect, a certain gap is left with the steel column. High-strength bolts are successively passed through the mounting holes of the second node plate and the positioning holes on the steel column, and fixed with nuts and disc springs to form a reliable connection. In order to eliminate the rigid domain effect and the opening and closing effect, a certain gap is left with the steel beam. The first node plate is provided with six arc-shaped guide grooves, which are clearance-matched with the screw rods; the second node plate is provided with six screw holes, and the six screw holes are aligned with the screw holes of the U-shaped port. The U-shaped port is provided with twelve screw holes, and the twelve screw holes are aligned with the arc-shaped guide grooves of the first node plate and the screw holes of the second node plate. During assembly, the screw is threaded through the arcuate guide slot of the No. 1 connecting plate of the first gusset plate, the screw hole of the No. 1 connecting plate of the U-shaped port, the screw hole of the second gusset plate, the screw hole of the No. 2 connecting plate of the U-shaped port, and the arcuate guide slot of the No. 2 connecting plate of the first gusset plate. The disc spring and nut are then threaded through the screws in sequence and tightened with a torque wrench. A disc spring is placed between the nut and the gusset plate. Tightening the nut with a torque wrench applies a preload to the nut, which compresses the disc spring, ensuring close contact between the first gusset plate, the buckling restraint brace, and the second gusset plate, forming a single unit.

[0050] During installation, first, place a layer of low-friction material, such as butyl rubber, on each end of the U-shaped port 25. Next, at nodes 1 and 2, the U-shaped port 25, already equipped with the low-friction material, is clamped between the second gusset plate and the second gusset plate, with two connecting plates. The first gusset plate, in turn, clamps the U-shaped port, already equipped with the low-friction material, between the two connecting plates. After a screw is passed through the arcuate guide groove of the first gusset plate's No. 1 connecting plate, the screw hole of the second gusset plate, the screw hole of the U-shaped port's No. 2 connecting plate, and the arcuate guide groove of the first gusset plate's No. 2 connecting plate, a disc spring and nut are then inserted. After assembly, do not tighten the nuts; simply ensure the assembly is complete. Then, at node 1, the first and second node plates are bolted to the steel beam and steel column, respectively, and secured with nuts and disc springs. A certain gap is left between the first node plate and the steel column, and a certain gap is left between the second node plate and the steel beam. At node 2, the first and second node plates are bolted to the steel beam and steel column (based on the first floor), respectively, and secured with nuts and disc springs. A certain gap is left between the first node plate and the steel column, and a certain gap is left between the second node plate and the steel beam (based on the first floor). Finally, tighten the loose nuts on the outside of the connecting plate of the first node plate with a torque wrench to form a secure connection.

[0051] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A buckling-resistance brace connecting plate with opening and closing, characterized in that: The connecting plate includes a first gusset plate, a second gusset plate, a screw, a disc spring, a nut, and a low-friction material; the first gusset plate is provided with an arc-shaped guide groove and is connected to the beam end of the steel frame; the second gusset plate is provided with a screw hole and is connected to the column end of the steel frame; the buckling restraint brace connection end is provided with a screw hole, and low-friction material is placed on both sides of the connection section; the screw sequentially passes through the screw hole of the second gusset plate, the screw hole of the buckling restraint brace connection end, and the arc-shaped guide groove of the first gusset plate, and is connected and fixed by the disc spring and the nut; The first node plate is welded to the steel beam through a fillet weld and leaves a gap with the steel column, and the second node plate is welded to the steel column through a fillet weld and leaves a gap with the steel beam; The first node plate is provided with three arc-shaped guide grooves, and the arc-shaped guide grooves are clearance-fitted with the screw rods. The clearance-fitting requires that the width of the arc-shaped guide grooves of the first node plate is greater than or equal to the diameter of the screw rods; the second node plate is provided with a screw rod hole, and the screw rod hole is aligned with the arc-shaped guide grooves of the first node plate; the anti-buckling support connection end is provided with a screw rod hole.

2. The buckling-resistance bracing connecting plate according to claim 1, wherein: The first node plate consists of a mounting plate and two parallel connecting plates arranged on the mounting plate, the two connecting plates are connecting plate No. 1 and connecting plate No. 2, and three arc-shaped guide grooves are respectively provided on connecting plate No. 1 and connecting plate No. 2; mounting holes are provided on the mounting plate.

3. The buckling-resistance bracing connecting plate with opening and closing function as claimed in claim 1, characterized in that: The second node plate is composed of a mounting plate and a connecting plate, and the mounting plate and the connecting plate are respectively provided with mounting holes and screw holes.

4. The buckling-resistance bracing connecting plate according to claim 3, wherein: The connection end of the anti-buckling support is set as a U-shaped port, and the U-shaped port forms two parallel connecting plates, which are U-shaped port No. 1 connecting plate and U-shaped port No. 2 connecting plate. The U-shaped port No. 1 connecting plate and the U-shaped port No. 2 connecting plate have the same number of screw holes; an inclination angle is set at the transition part of the anti-buckling support; and low-friction material is placed on the outside of the U-shaped port.

5. The buckling-resistance bracing connecting plate with opening and closing function as claimed in claim 4, characterized in that: The first node plate is fixed by bolts and nuts after the mounting holes of the mounting plate are aligned with the positioning holes on the steel beam; the second node plate is fixed by nuts and disc springs after the mounting holes on the mounting plate are aligned with the positioning holes on the steel column.

6. The buckling-resistance bracing connecting plate with opening and closing function according to claim 4 or 5, characterized in that: After the screw passes through the arc guide groove of the No. 1 connecting plate of the first node plate, the screw hole of the No. 1 connecting plate of the U-shaped port, the screw hole of the second node plate, the screw hole of the No. 2 connecting plate of the U-shaped port and the arc guide groove of the No. 2 connecting plate of the first node plate, the disc spring and the nut are put through in sequence and tightened and fixed with a torque wrench; a disc spring is placed between the nut and the node plate, and the nut is tightened with a torque wrench to apply a pre-tightening force to the nut. The nut will squeeze the disc spring, so that the first node plate, the anti-buckling support structure and the second node plate are in close contact to form a whole.

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