Steel-wood connecting device with asymmetric energy dissipation assembly

Abstract

The steel-wood connecting device comprises a CLT shear wall, outer plates, a steel beam, cover plates, inner plates and the energy dissipation assemblies, the CLT shear wall is arranged below the steel beam, the outer plates and the cover plates are arranged on the left side and the right side of the CLT shear wall respectively, the energy dissipation assemblies are arranged between the outer plates and the cover plates, the CLT shear wall is used for bearing loads, and the inner plates are used for bearing the loads. The steel beam is used for bearing and supporting a wall body, the outer plate is used as a fixing plate of the energy dissipation assembly, the cover plate is used as a sealing cover plate of the energy dissipation assembly, the energy dissipation assembly comprises an inner side friction plate and an outer side friction plate, the inner side friction plate is arranged on the side, away from the CLT shear wall, of the outer plate, and the outer side friction plate is arranged on the side, facing the CLT shear wall, of the cover plate. An inner plate is arranged between the inner side friction plate and the outer side friction plate and used for transmitting the lateral load of the steel beam. Compared with the prior art, the steel-wood connecting device can be applied to a steel-wood mixed structure, so that the energy dissipation capacity, the anti-seismic property and the anti-seismic toughness of the structure are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and in particular to a steel-wood connection device containing an asymmetric energy dissipation component. Background Art

[0002] With the rapid economic development in China, people's requirements for the safety performance of buildings are getting higher and higher. Natural disasters have caused countless damages to buildings, among which the damages caused by earthquakes are particularly prominent. Therefore, it is crucial to improve the seismic performance of buildings. Wood is a good building material. Compared with other building materials, wood has the advantages of low carbon energy conservation, environmental protection and renewable, light weight and high strength, and good seismic performance. Earthquakes occur frequently, with high intensity and wide distribution in China. Compared with other building materials, wooden structures are lighter in mass, have great toughness, and have strong resistance to instantaneous impact loads and cyclic fatigue damages.

[0003] Although wood is a good seismic building material, due to its own strength reasons, the use range of wood is limited and it can only be used in low-rise buildings. However, steel structures are light in weight and high in strength, and have good seismic performance. Combining wooden structures and steel structures can give full play to their respective advantages and form a hybrid structure with good seismic performance and environmental protection.

[0004] Although the steel-wood hybrid structure has good seismic performance, once the structure is damaged by an earthquake, it will cause a large amount of economic losses. Therefore, it is necessary to improve the seismic performance of buildings and reduce the economic losses caused by earthquakes to buildings. Friction energy dissipation devices are simple and stable, and achieve the maximum energy dissipation due to the generation of a rectangular hysteresis curve, and have been well applied in building projects around the world. The energy dissipation device dissipates seismic energy through the friction generated by the relative sliding of the friction surface, thereby reducing the vibration amplitude of the structure and protecting the structure from damage. After an earthquake, it can be put back into use only by simply repairing the structure.

[0005] Chinese Patent CN110777969A discloses an assembled slotted shear wall with a vertical friction energy dissipation device. It is assembled into an integral body by precast shear wall panels, embedded steel plates, embedded grooved plates, embedded bolts, and friction materials. It changes the vertical splicing method of traditional assembled shear walls, mainly with bending failure, thus avoiding shear brittle failure. Through asymmetric friction design, the wall panels work integrally under small earthquakes, and the wall panels shear and slide along the vertical seams under medium and large earthquakes, changing from the integral wall working to each wall panel seismically resistant separately, meeting the two-stage seismic fortification objectives. The seismic energy is dissipated through the friction energy dissipation device, and the purpose of low damage of the structure can be achieved. However, this scheme uses a symmetric friction energy dissipation device (bilateral friction plates), and the slip force mainly depends on the bolt pre-tightening force, and the adjustment range is limited. Summary of the Invention

[0006] The object of the present invention is to provide a steel-wood connection device containing an asymmetric energy dissipation component. The steel-wood connection device can be applied to a steel-wood hybrid structure, thereby improving the energy dissipation capacity, seismic performance and seismic toughness of the structure.

[0007] The object of the present invention can be achieved by the following technical solutions:

[0008] A steel-wood connection device containing an asymmetric energy dissipation component, comprising a CLT shear wall, an outer plate, a steel beam, a cover plate, an inner plate and an energy dissipation component.

[0009] The CLT shear wall is arranged below the steel beam. An outer plate and a cover plate are arranged on each of the left and right sides of the CLT shear wall. An energy dissipation component is arranged between the outer plate and the cover plate. The CLT shear wall is used to bear the load, the steel beam is used for load-bearing and wall support, the outer plate is used as a fixing plate for the energy dissipation component, and the cover plate is used as a sealing cover plate for the energy dissipation component.

[0010] The energy dissipation component includes an inner friction plate and an outer friction plate. The inner friction plate is arranged on the side of the outer plate away from the CLT shear wall, the outer friction plate is arranged on the side of the cover plate facing the CLT shear wall, and an inner plate is arranged between the inner friction plate and the outer friction plate. The inner plate is used to transfer the lateral load of the steel beam.

[0011] As a preferred technical solution, the CLT shear wall is a wall for bearing horizontal loads and vertical loads caused by wind loads or earthquakes, and preventing structural shear failure of the steel-wood connection device.

[0012] In an embodiment of the present invention, the materials of the outer plate, the steel beam and the cover plate are all Q235 steel, and the material of the inner plate is stainless steel.

[0013] In an embodiment of the present invention, two inner baffles are symmetrically arranged on the outer plate, and the inner friction plate is embedded between the two inner baffles;

[0014] Two outer baffles are symmetrically arranged on the cover plate, and the outer friction plate is embedded between the two outer baffles.

[0015] As a preferred technical solution, the inner baffle is fixed to the back of the outer plate by laser welding, and the outer baffle is fixed to the back of the cover plate by laser welding. Its function is to prevent the relative sliding between the inner friction plate and the outer plate, and between the outer friction plate and the cover plate, and is used to fix the friction plate.

[0016] In an embodiment of the present invention, the materials of the inner baffle and the outer baffle are both Q235 steel, and their function is to prevent the relative displacement between the inner friction plate and the outer plate, and between the outer friction plate and the cover plate.

[0017] In an embodiment of the present invention, a plurality of countersunk screw holes are provided on the outer plate, and the outer plate is fixed to the surface of the CLT shear wall by self-tapping screws passing through the countersunk screw holes and structural adhesive in a combined bonding and screwing connection manner.

[0018] In an embodiment of the present invention, the cover plate, the inner plate and the outer plate are connected by prestressing bolts.

[0019] In an embodiment of the present invention, a disc spring is provided between the prestressing bolt and the cover plate, and the function of the disc spring is to reduce the damage of the pre-tightening force of the prestressing bolt caused by the relative sliding of the friction interface of the energy dissipation component.

[0020] In an embodiment of the present invention, an oblong hole for the inner plate is provided on the steel beam, two bolt holes for the outer plate are provided on the outer plate, two bolt holes for the cover plate are provided on the cover plate, and a flange nut is welded to the side of the prestressing bolt close to the CLT shear wall. The use of a welded flange nut facilitates the installation of the prestressing bolt;

[0021] The prestressing bolt sequentially passes through the bolt hole of the cover plate, the oblong hole of the inner plate and the bolt hole of the outer plate and is connected to the flange nut.

[0022] As a preferred technical solution, the diameters of the bolt holes of the cover plate and the outer plate are 1 mm larger than the diameter of the prestressing bolt.

[0023] As a preferred technical solution, the center of the flange nut is aligned with the center of the bolt hole of the outer plate for the installation of the prestressing bolt

[0024] As a preferred technical solution, two slots are provided on the CLT shear wall, and the slots are used for sinking the flange nut for the installation of the prestressing bolt, and the hole diameter of the slot is larger than the disc diameter of the flange nut to prevent the inability to install the prestressing bolt due to installation errors.

[0025] In an embodiment of the present invention, the inner plate is integrally formed into an L-shaped steel plate by a long plate and a short plate, the steel beam is fixed above the short plate by a fixing component, and an oblong hole for the inner plate is provided on the long plate.

[0026] In an embodiment of the present invention, an oblong hole for the steel beam is provided at the bottom end of the steel beam, and a bolt hole for the inner plate is provided on the short plate,

[0027] The fixing component includes a bolt, a nut, a gasket and a structural gasket. The bolt sequentially passes through the bolt hole of the inner plate and the oblong hole of the steel beam and is connected to the nut. A gasket is provided between the nut and the oblong hole of the steel beam, and a structural gasket is provided between the bolt and the bolt hole of the inner plate.

[0028] The oblong hole of the steel beam is used for the fixation of the inner plate and to avoid the bolt not being inserted into the bolt hole due to installation errors.

[0029] The principle of the present invention is as follows:

[0030] In the present invention, the node connection uses an asymmetric energy dissipating member. The friction type energy dissipating member usually consists of an inner plate with an oblong hole, two outer plates with bolt holes, two friction plates, and bolts for applying pre-tightening force. The connection configuration diagram is as Figure 9 shown.

[0031] The friction type energy dissipating member can be divided into a symmetric friction energy dissipating member and an asymmetric friction type energy dissipating member. When a relatively large external force V SS causes slippage on the inner plate of the symmetric friction type energy dissipating member, the applied external force is borne by each of the two outer plates by 1 / 2. Different from this, for the asymmetric friction type energy dissipating member, when a relatively large force V SS causes slippage on the inner plate, the applied force is all borne by the upper outer plate, and the lower outer plate does not bear it.

[0032] The present invention has conducted a reciprocating loading test on the asymmetric friction type energy dissipating member. The obtained hysteresis curve of the asymmetric energy dissipating member is plump, and the energy dissipation performance is stable, as Figure 10 shown.

[0033] The slip starting force V SS of the asymmetric friction type energy dissipating member can be estimated by Coulomb friction force, as shown in the formula:

[0034] V ss = n × m × μ e × N

[0035] In the formula, the slip starting force V SS depends on the number of bolts n, the number of slip surfaces m, the friction coefficient μ e and the bolt pre-tightening force. By estimating the slip starting force of the energy dissipating member, the problem that the slip force of the node is not easy to control can be effectively solved, thereby enhancing the energy dissipation capacity of the node. Using the asymmetric energy dissipating member in the steel-wood connection node can effectively reduce the economic damage caused by earthquakes. After the earthquake, the structure can be put back into use only by repairing the energy dissipating member.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] (1) In the present invention, the inner friction plate and the outer friction plate are respectively fixed on the back of the outer plate and the cover plate, and between the inner baffle and the outer baffle by embedding between every two of the three plates, and a pre-tightening force is applied to the prestressed bolt provided with a disc spring to form an energy dissipation assembly.

[0038] (2) In the steel-wood connection device with an asymmetric energy dissipation component provided by the present invention, the outer plate is fixedly connected to the surface of the CLT shear wall through a combined connection of glue and nails. By drilling countersunk nail holes on the back of the outer plate, applying steel-bonding glue on the front of the outer plate, and using an impact drill to drive self-tapping screws into the countersunk nail holes in a staggered manner, the outer plate is completely fixed to the surface of the CLT shear wall. The use of the combined connection of glue and nails to fix the outer plate to the CLT shear wall is to increase the connection stiffness between the energy dissipation device and the CLT shear wall, prevent the connection of the nodes from being damaged before the energy dissipation device comes into play, and thus prevent the energy dissipation capacity from being limited.

[0039] (3) In the present invention, the outer plate is fixed to the surface of the CLT shear wall by using a combined fastening connection of glue and screws, and then the inner plate is fixed to the steel beam by using prestressed bolts, thereby forming a steel-wood connection device with an asymmetric energy dissipation component. The invention not only ensures the seismic resistance of the structural nodes but also improves the energy dissipation capacity and seismic toughness of the structural nodes. In terms of the energy dissipation capacity, the use of energy dissipation components in the steel-wood hybrid structure nodes improves the controllability of the node slip force, and the use of the combined connection of glue and nails increases the connection stiffness between the friction device and the CLT shear wall, thereby improving the energy dissipation capacity of the nodes. In terms of seismic toughness, an asymmetric energy dissipation device is used between the CLT shear wall and the steel beam. After an earthquake, only according to the damage degree of the nodes, corresponding repair plans are made for the nodes, and the structure can be put back into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of the steel-wood connection device with an asymmetric energy dissipation component in the present invention;

[0041] Figure 2 is an exploded view of the steel-wood connection device with an asymmetric energy dissipation component in the present invention;

[0042] Figure 3 is an axonometric view of the CLT shear wall of the present invention;

[0043] Figure 4 is an axonometric view of the outer plate of the present invention

[0044] Figure 5 is a rear view of the outer plate of the present invention;

[0045] Figure 6 is an axonometric view of the steel beam of the present invention;

[0046] Figure 7 is an axonometric view of the cover plate of the present invention;

[0047] Figure 8 is an axonometric view of the inner plate of the present invention;

[0048] Figure 9 is a schematic structural diagram of the asymmetric energy dissipation component;

[0049] Figure 10 It is the hysteresis curve graph of the asymmetric energy dissipation component.

[0050] Description of the attached drawing numbers: 1. CLT shear wall, 101. Groove, 2. Outer plate, 201. Inner baffle, 203. Self-tapping screw, 204. Steel-bonding adhesive, 205. Flange nut, 206. Countersunk head screw hole, 207. Outer plate bolt hole, 3. Steel beam, 301. Bolt, 302. Nut, 303. Washer, 304. Structural washer, 305. Long oval hole of steel beam, 4. Cover plate, 401. Outer baffle, 403. Prestressing bolt, 404. Disc spring, 405. Cover plate bolt hole, 5. Inner plate, 501. Inner plate bolt hole, 502. Long oval hole of inner plate, 6. Inner friction plate, 7. Outer friction plate, 8. Pre-tightening force, 9. Upper outer plate, 10. Friction plate, 11. Lower outer plate. Specific implementation manners

[0051] The present invention will be described in detail below with reference to the attached drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and gives the detailed implementation manners and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0052] It should be noted that: Similar reference numerals and letters denote similar items in the following attached drawings. Therefore, once an item is defined in one attached drawing, it does not need to be further defined and explained in subsequent attached drawings.

[0053] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0055] The following will describe in detail some embodiments of the present invention in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0056] Embodiment 1

[0057] Refer to Figures 1 to 8 , this embodiment provides a steel-wood connection device containing an asymmetric energy dissipation component, including a CLT shear wall 1, an outer plate 2, a steel beam 3, a cover plate 4, an inner plate 5 and an energy dissipation component.

[0058] The CLT shear wall 1 is arranged below the steel beam 3. An outer plate 2 and a cover plate 4 are provided on both the left and right sides of the CLT shear wall 1. An energy dissipation component is provided between the outer plate 2 and the cover plate 4. The CLT shear wall 1 is used to bear the load, the steel beam 3 is used for load-bearing and wall support, the outer plate 2 is used as a fixing plate for the energy dissipation component, and the cover plate 4 is used as a cover plate for the energy dissipation component.

[0059] The energy dissipation component includes an inner friction plate 6 and an outer friction plate 7. The inner friction plate 6 is provided on the side of the outer plate 2 away from the CLT shear wall 1, and the outer friction plate 7 is provided on the side of the cover plate 4 facing the CLT shear wall 1. An inner plate 5 is provided between the inner friction plate 6 and the outer friction plate 7, and the inner plate 5 is used to transfer the lateral load of the steel beam 3.

[0060] In this embodiment, the CLT shear wall 1 is a wall for bearing horizontal loads and vertical loads caused by wind loads or earthquakes, and preventing structural shear failure of the steel-wood connection device.

[0061] In this embodiment, the materials of the outer plate 2, the steel beam 3 and the cover plate 4 are all Q235 steel, and the material of the inner plate 5 is stainless steel.

[0062] In this embodiment, two inner baffles 201 are symmetrically provided on the outer plate 2, and the inner friction plate 6 is embedded between the two inner baffles 201;

[0063] Two outer baffles 401 are symmetrically provided on the cover plate 4, and the outer friction plate 7 is embedded between the two outer baffles 401.

[0064] In this embodiment, the inner baffle 201 is fixed to the back of the outer plate 2 by laser welding, and the outer baffle 401 is fixed to the back of the cover plate 4 by laser welding. Its function is to prevent the mutual sliding between the inner friction plate 6 and the outer plate 2, and between the outer friction plate 7 and the cover plate 4, and is used to fix the friction plate.

[0065] In this embodiment, the materials of the inner baffle 201 and the outer baffle 401 are both Q235 steel, and their function is to prevent the mutual dislocation between the inner friction plate 6 and the outer plate 2, and between the outer friction plate 7 and the cover plate 4.

[0066] In this embodiment, a plurality of countersunk screw holes 206 are provided on the outer plate 2, and the outer plate 2 is fixed to the surface of the CLT shear wall 1 by self-tapping screws 203 passing through the countersunk screw holes 206 and adhesives 204 in a manner of combined glue and nail connection.

[0067] In this embodiment, the cover plate 4, the inner plate 5 and the outer plate 2 are connected by prestressed bolts 403.

[0068] In this embodiment, a disc spring 404 is provided between the prestressed bolt 403 and the cover plate 4, and the function of the disc spring 404 is to reduce the pre-tightening force damage of the prestressed bolt 403 caused by the relative sliding of the friction interface of the energy dissipation component.

[0069] In this embodiment, an inner plate oblong hole 502 is provided on the steel beam 3, two outer plate bolt holes 207 are provided on the outer plate 2, two cover plate bolt holes 405 are provided on the cover plate 4, and a flange nut 205 is welded to the side of the outer plate 2 close to the CLT shear wall 1 where the prestressed bolt 403 is located. Welding the flange nut can facilitate the installation of the prestressed bolt 403;

[0070] The prestressed bolt 403 sequentially passes through the cover plate bolt hole 405, the inner plate oblong hole 502 and the outer plate bolt hole 207 and is connected to the flange nut 205.

[0071] In this embodiment, the diameters of the cover plate bolt hole 405 and the outer plate bolt hole 207 are 1 mm larger than the diameter of the prestressed bolt 403.

[0072] In this embodiment, the center of the flange nut 205 is aligned with the center of the outer plate bolt hole 207 for the installation of the prestressed bolt 403

[0073] In this embodiment, two slots 101 are provided on the CLT shear wall 1, and the slots 101 are used for sinking the flange nut 205 for the installation of the prestressed bolt 403, and the hole diameter of the slots 101 is larger than the disc diameter of the flange nut 205 to prevent the inability to install the prestressed bolt 403 due to installation errors.

[0074] In this embodiment, the inner plate 5 is integrally formed into an L-shaped steel plate by a long plate and a short plate, the steel beam 3 is fixed above the short plate by a fixing component, and an inner plate oblong hole 502 is provided on the long plate.

[0075] In this embodiment, a steel beam oblong hole 305 is provided at the bottom end of the steel beam 3, and an inner plate bolt hole 501 is provided on the short plate,

[0076] The fixing component includes a bolt 301, a nut 302, a gasket 303 and a structural gasket 304. The bolt 301 passes through the inner plate bolt hole 501 and the long circular hole 305 of the steel beam in sequence and is connected to the nut 302. A gasket 303 is arranged between the nut 302 and the long circular hole 305 of the steel beam, and a structural gasket 304 is arranged between the bolt 301 and the inner plate bolt hole 501.

[0077] The long circular hole 305 of the steel beam is used for fixing the inner plate 5 and avoiding the bolt from not being inserted into the bolt hole due to installation errors.

[0078] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention as disclosed should be within the protection scope of the present invention.

Claims

1. A steel-wood connection device containing an asymmetric energy dissipation component, characterized in that, It includes a CLT shear wall (1), an outer plate (2), a steel beam (3), a cover plate (4), an inner plate (5) and an energy dissipation component. The CLT shear wall (1) is arranged below the steel beam (3). An outer plate (2) and a cover plate (4) are provided on each of the left and right sides of the CLT shear wall (1). An energy dissipation component is provided between the outer plate (2) and the cover plate (4). The CLT shear wall (1) is used to bear the load, the steel beam (3) is used for load-bearing and wall support, the outer plate (2) is used as a fixing plate for the energy dissipation component, and the cover plate (4) is used as a cover plate for the energy dissipation component. The energy dissipation component includes an inner friction plate (6) and an outer friction plate (7). The inner friction plate (6) is provided on the side of the outer plate (2) away from the CLT shear wall (1), and the outer friction plate (7) is provided on the side of the cover plate (4) facing the CLT shear wall (1). An inner plate (5) is provided between the inner friction plate (6) and the outer friction plate (7), and the inner plate (5) is used to transfer the lateral load of the steel beam (3).

2. The steel-wood connection device with an asymmetric energy dissipation component according to claim 1, characterized in that, The materials of the outer plate (2), the steel beam (3) and the cover plate (4) are all Q235 steel, and the material of the inner plate (5) is stainless steel.

3. The steel-wood connection device containing an asymmetric energy dissipation component according to claim 1, characterized in that, Two inner baffles (201) are symmetrically provided on the outer plate (2), and the inner friction plate (6) is embedded between the two inner baffles (201); Two outer baffles (401) are symmetrically provided on the cover plate (4), and the outer friction plate (7) is embedded between the two outer baffles (401).

4. The steel-wood connection device with an asymmetric energy dissipation component according to claim 3, characterized in that, The materials of the inner baffle (201) and the outer baffle (401) are both Q235 steel.

5. An steel-wood connection device with an asymmetric energy dissipation component according to claim 1, characterized in that, A plurality of countersunk screw holes (206) are provided on the outer plate (2), and the outer plate (2) is fixed to the surface of the CLT shear wall (1) by self-tapping screws (203) passing through the countersunk screw holes (206) and structural adhesive (204) in a combined glue and screw connection manner.

6. The steel-wood connection device with an asymmetric energy dissipation component according to claim 1, characterized in that, The cover plate (4), the inner plate (5) and the outer plate (2) are connected by prestressed bolts (403).

7. The steel-wood connection device with an asymmetric energy dissipation component according to claim 6, characterized in that, A disc spring (404) is provided between the prestressed bolt (403) and the cover plate (4).

8. An iron-wood connection device containing an asymmetric energy dissipation component according to claim 6, characterized in that, An inner plate oblong hole (502) is provided on the steel beam (3), two outer plate bolt holes (207) are provided on the outer plate (2), two cover plate bolt holes (405) are provided on the cover plate (4), and a flange nut (205) is welded to the side of the prestressed bolt (403) close to the CLT shear wall (1) on the outer plate (2); The prestressed bolt (403) sequentially passes through the cover plate bolt hole (405), the inner plate oblong hole (502) and the outer plate bolt hole (207) and is connected to the flange nut (205).

9. The steel-wood connection device with an asymmetric energy dissipation component according to claim 1, characterized in that, The inner plate (5) is integrally formed into an L-shaped steel plate by a long plate and a short plate. The steel beam (3) is fixed above the short plate by a fixing component, and the inner plate oblong hole (502) is provided on the long plate.

10. The steel-wood connection device with an asymmetric energy dissipation component according to claim 9, characterized in that, A steel beam oblong hole (305) is provided at the bottom end of the steel beam (3), and an inner plate bolt hole (501) is provided on the short plate. The fixing component includes a bolt (301), a nut (302), a gasket (303) and a structural gasket (304). The bolt (301) passes through the inner plate bolt hole (501) and the long oval hole of the steel beam (305) in sequence and is connected to the nut (302). A gasket (303) is provided between the nut (302) and the long oval hole of the steel beam (305), and a structural gasket (304) is provided between the bolt (301) and the inner plate bolt hole (501).

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