Prefabricated node type pultrusion profile connecting structure and method based on resistance fusion welding technology

Abstract

The invention provides a prefabricated node type pultrusion profile connecting structure and method based on a resistance fusion welding technology. The connecting structure comprises a first fusion welding piece, a reinforcing mesh piece, a second fusion welding piece, a connecting plate and a fastener. The first welding sheet and the second welding sheet are used for fixedly connecting the reinforcing mesh to the pultrusion profile connecting section after the first welding sheet and the second welding sheet are melted so as to form a prefabricated node; the two ends of the connecting plate are arranged on the prefabricated nodes of the different pultrusion profile connecting sections respectively, and the fasteners are used for connecting the connecting plate, the prefabricated nodes and the pultrusion profile connecting sections into a whole. The reinforcing mesh can effectively improve the shearing performance of the combination portion of the fastener and the pultrusion profile, so that the bearing capacity and durability of fastener connection are improved, when the first welding piece and the second welding piece are heated to be in a molten state, the material performance of the pultrusion profile cannot be reduced, and the service life of the pultrusion profile is prolonged. The influence on the connection strength and durability of the connection sections of the pultrusion profiles is prevented, so that the connection between the pultrusion profiles is firm and stable, and the service life is long.

Description

Technical Field

[0001] The invention relates to the technical field of pultruded profiles, and in particular to a prefabricated node-type pultruded profile connection structure and a connection method based on resistance fusion welding technology. Background Art

[0002] Compared with traditional building materials, fiber-reinforced composite pultruded profiles have higher specific modulus and specific strength, excellent corrosion resistance and fatigue resistance, and lower maintenance costs throughout the life cycle. They have demonstrated strong competitiveness in civil engineering applications at home and abroad.

[0003] Common thermosetting resin-based pultruded profile connection technologies at home and abroad mainly include adhesive connection and bolt connection. Adhesive connection has low connection strength and poor durability. Bolted connection weakens the cross-section of the component to a large extent due to the presence of bolt holes; stress concentration is easily generated at the connection, resulting in splitting and damage at the bolt holes. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a prefabricated node-type pultruded profile connection structure and a connection method based on resistance fusion welding technology to eliminate or improve one or more defects existing in the prior art.

[0005] The present invention provides a prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology, comprising a first welding sheet, a reinforcing mesh sheet and a second welding sheet sequentially arranged on a pultruded profile connection section;

[0006] and a connecting plate and a fastener for connecting two connecting sections of the pultruded profile;

[0007] Wherein, the first welding sheet and the second welding sheet are used to fix the reinforcing mesh sheet to the pultruded profile connecting section after melting to form a prefabricated node;

[0008] The two ends of the connection plate are respectively arranged on the prefabricated nodes of the two pultruded profile connection sections, and the fasteners are used to connect the connection plate, the prefabricated nodes and the pultruded profile connection section as a whole to connect the two pultruded profiles.

[0009] In some embodiments of the present invention, the pultruded profile is a thermosetting resin-based pultruded profile;

[0010] The first welding sheet and the second welding sheet are thermoplastic resin films;

[0011] The damage temperature of the pultruded profile is higher than the melting point temperature of the first welding sheet and the second welding sheet.

[0012] In some embodiments of the present invention, the fiber of the pultruded profile is any one of glass fiber, carbon fiber, basalt fiber and aramid fiber.

[0013] In some embodiments of the present invention, when the resin of the thermosetting resin-based pultruded profile is polyetherimide or polyamide resin, the resin of the thermoplastic resin film is vinyl resin or epoxy resin.

[0014] In some embodiments of the present invention, the thickness of the first welding sheet and the second welding sheet is 0.1 mm-0.3 mm.

[0015] In some embodiments of the present invention, the reinforcing mesh is any one of a steel mesh, an iron mesh and a stainless steel mesh.

[0016] In some embodiments of the present invention, the fastener is any one of a bolt, a rivet and a screw.

[0017] In some embodiments of the present invention, the reinforcing mesh is a metal mesh, and the metal mesh has a wire connecting portion for connecting to a power source through a wire to generate heat.

[0018] The present invention also provides a method for connecting prefabricated node-type pultruded profiles based on resistance fusion welding technology. Based on the prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology, the connection method comprises the following steps:

[0019] Prefabricated node manufacturing steps: coating a first welding sheet on the pultruded profile connection section, welding a reinforcing mesh sheet on the first welding sheet, coating a second welding sheet on the reinforcing mesh sheet, electrifying the reinforcing mesh sheet, and the reinforcing mesh sheet melts the first welding sheet and the second welding sheet, and after the first welding sheet and the second welding sheet are cooled, the reinforcing mesh sheet is fixed on the pultruded profile connection section to form a prefabricated node;

[0020] Fastener connection step: the two ends of the connection plate are respectively arranged on the prefabricated nodes of the connection section between the pultruded profiles, and the fasteners connect the connection plate, the prefabricated nodes and the pultruded profile connection section as a whole.

[0021] In some embodiments of the present invention, the prefabricated node manufacturing step is completed in a factory, and the fastener connecting step is completed at a construction site.

[0022] The prefabricated node-type pultruded profile connection structure and connection method based on resistance welding technology in the embodiment of the present invention have the following technical effects: the reinforcing mesh is fixedly connected to the connection section of the pultruded profile through the first welding sheet and the second welding sheet, the connection plate itself has a high connection strength, and the fastener connects the connection plate and the pultruded profile with the prefabricated node together. The reinforcing mesh can effectively increase the shear performance of the fastener and the pultruded profile joint, thereby increasing the bearing capacity and durability of the fastener connection. The damaged temperature of the pultruded profile is higher than the melting point temperature of the first welding sheet and the second welding sheet. When the first welding sheet and the second welding sheet are heated to a molten state, the material properties of the pultruded profile will not be reduced, and the connection strength and durability at the connection section of the pultruded profile will not be affected, so that the connection between the pultruded profiles is firm, stable, and has a long life.

[0023] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically indicated in the specification and the accompanying drawings.

[0024] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for the purpose of illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention.

[0026] Figure 1 Schematic diagram of the position of prefabricated nodes on a pultruded profile in one embodiment of the present invention.

[0027] Figure 2 This is an exploded view of a prefabricated node in one embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the process flow of resistance fusion welding technology in one embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of a pultruded profile having multiple prefabricated nodes in one embodiment of the present invention.

[0030] Figure 5It is a schematic diagram of the structure of the butt joint between pultruded profiles in one embodiment of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the connection of I-shaped pultruded profiles in one embodiment of the present invention.

[0032] Figure 7 It is a schematic structural diagram of the connection of grooved pultruded profiles in one embodiment of the present invention.

[0033] Figure 8 It is a schematic structural diagram of the connection of angular pultruded profiles in one embodiment of the present invention.

[0034] Fig. 9 It is a schematic structural diagram of the connection of flat-plate pultruded profiles in one embodiment of the present invention.

[0035] Fig.10 It is a structural schematic diagram of box-shaped pultruded profile connection in one embodiment of the present invention.

[0036] Fig.11 This is a flow chart of a method for connecting prefabricated node-type pultruded profiles based on resistance fusion welding technology in one embodiment of the present invention.

[0037] Figure numerals: 1. pultruded profile; 11. first pultruded profile; 12. second pultruded profile; 110. first prefabricated node-type pultruded profile; 120. second prefabricated node-type pultruded profile; 2. prefabricated node; 21. first welding plate; 22. reinforcing mesh; 23. second welding plate; 3. power supply; 4. connecting plate; 5. fastener. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0039] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0040] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0041] It should also be noted that, unless otherwise specified, the term “connection” herein may refer not only to a direct connection but also to an indirect connection involving an intermediate.

[0042] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0043] In order to solve the problem of thermosetting resin-based pultruded profile connection technology, an embodiment of the present invention provides a prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology. Based on the resistance fusion welding technology, a node connection system with good mechanical properties, high bearing capacity, simple operation process and high construction efficiency is established based on a new type of prefabricated node-type pultruded profile.

[0044] Resistance fusion welding technology can be used to connect pultruded profiles. Resistance fusion welding technology is a common thermosetting resin-based pultruded profile connection technology. It uses the heat generated when electric current passes through the material to locally melt the material in the joint area, and then connects it through pressure. Resistance fusion welding technology adapts to the growing demand for lightweight and high-strength structures. In the future, with the development of automation technology, the application of resistance fusion welding will become more common, promoting innovation and efficiency improvement in the construction industry. However, the existing resistance fusion welding technology for connecting thermosetting resin-based pultruded profiles has certain disadvantages: resistance fusion welding causes the performance of thermosetting resin-based pultruded profile materials in the heat-affected zone to decrease, affecting the strength and durability of the connection; tiny defects will be generated during the welding process, which is difficult to detect later, affecting the reliability of long-term use, and defects and node connections are difficult to repair; the construction conditions are high and the steps are cumbersome, resulting in construction difficulties and low construction efficiency. The embodiment of the present invention is a prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology. The pultruded profile connection structure is manufactured using a new resistance fusion welding technology, which can solve the problems in the prior art of poor connection strength of pultruded profiles, easy damage to the pultruded profile structure by resistance fusion welding, and difficult construction and low construction efficiency.

[0045] Reference Figure 1 and Figure 2 The embodiment of the present invention provides a prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology, comprising a first welding sheet 21, a reinforcing mesh sheet 22, and a second welding sheet 23 sequentially arranged on the connection section of the pultruded profile 1; and a connecting plate 4 and a fastener 5 for connecting two connection sections of the pultruded profile 1. Among them, the first welding sheet 21 and the second welding sheet 23 are used to fix the reinforcing mesh sheet 22 on the connection section of the pultruded profile 1 after melting to form a prefabricated node 2; the two ends of the connecting plate 4 are respectively arranged on the prefabricated nodes 2 of the connection sections of the two pultruded profiles 1, and the fastener 5 is used to connect the connecting plate 4, the prefabricated node 2, and the connection section of the pultruded profile 1 into one body to connect the two pultruded profiles 1.

[0046] Specifically in the above embodiment, the reinforcing mesh 22 is fixedly connected to the connecting section of the pultruded profile 1 through the first welding sheet 21 and the second welding sheet 23. The connecting plate 4 itself has a high connection strength, and the fastener 5 connects the connecting plate 4 and the pultruded profile 1 with the prefabricated node 2 together. The reinforcing mesh 22 can effectively increase the shear performance of the fastener 5 and the pultruded profile 1, thereby increasing the bearing capacity and durability of the connection of the fastener 5. The damaged temperature of the pultruded profile 1 is higher than the melting point temperature of the first welding sheet 21 and the second welding sheet 23. When the first welding sheet 21 and the second welding sheet 23 are heated to a molten state, the material properties of the pultruded profile 1 will not be reduced, and the connection strength and durability at the connecting section of the pultruded profile 1 will not be affected, so that the connection of the two pultruded profiles 1 is firm, stable, and has a long service life.

[0047] Reference Figure 1 The prefabricated node 2 is located on the outer surface of the connection end of the pultruded profile 1, and except along the direction of the pultruded profile 1, the prefabricated node 2 has a certain distance from the outer edge line, which leaves some technical process and construction space while ensuring the connection performance.

[0048] Reference Figure 2 The prefabricated node 2 structure is composed of a reinforcing mesh 22 with a layer of thermoplastic resin film covering both sides.

[0049] In some embodiments, the pultruded profile 1 is a thermosetting resin-based pultruded profile; the first welding sheet 21 and the second welding sheet 23 are thermoplastic resin films; the damage temperature of the pultruded profile 1 is higher than the melting point temperature of the first welding sheet 21 and the second welding sheet 23. Such an arrangement can ensure that the first welding sheet 21 and the second welding sheet 23 will not damage the pultruded profile 1 after melting, and the first welding sheet 21 and the second welding sheet 23 can firmly fix the reinforcing mesh 22 on the pultruded profile 1 after cooling, and the pultruded profile 1, the first welding sheet 21, the reinforcing mesh 22 and the second welding sheet 23 form an integrated structure, and the first welding sheet 21, the reinforcing mesh 22 and the second welding sheet 23 form a prefabricated node 2.

[0050] The prefabricated node-type pultruded profile connection structure of the present embodiment utilizes the characteristics of thermoplastic resin that softens when heated and hardens when cooled to give the connection nodes prefabrication (the prefabricated node-type pultruded profile connection structure of the present embodiment is divided into two parts, one part is a pultruded profile with multiple prefabricated nodes 2 set at the connection end in the factory using resistance welding technology to form a prefabricated node-type pultruded profile, and the other part is a prefabricated node-type pultruded profile that is prefabricated and sent to the construction site for bolt connection), saving construction time and cost; the prefabricated node-type pultruded profile can be prefabricated in the factory before being sent to the construction site for bolt connection, and the node defects can be detected in advance before being sent to the construction site.

[0051] In some embodiments, the fiber of the pultruded profile 1 is any one of glass fiber, carbon fiber, basalt fiber and aramid fiber.

[0052] In some embodiments, when the resin of the thermosetting resin-based pultrusion profile is polyetherimide or polyamide resin, the resin of the thermoplastic resin film is vinyl resin or epoxy resin.

[0053] In some embodiments, the thickness of the first welding sheet 21 and the second welding sheet 23 is 0.1 mm-0.3 mm.

[0054] In some embodiments, the reinforcing mesh 22 is any one of a steel mesh, an iron mesh and a stainless steel mesh. The addition of metal meshes such as steel mesh allows the thermoplastic resin to be heated evenly, and the prefabricated node 2 is tightly connected to the connection surface of the pultruded profile 1, which can effectively increase the shear performance of the connection node, thereby increasing the bearing capacity of the bolt node connection.

[0055] Reference Figure 4 The connection end of the pultruded profile 1 is provided with a plurality of prefabricated nodes 2 according to the resistance fusion welding process, including the flange and the web of the pultruded profile 1 .

[0056] Reference Figure 5 When the first pultruded profile 11 and the second pultruded profile 12 are connected, a plurality of prefabricated nodes 2 are closely connected along the side length of the profile direction.

[0057] In some embodiments, the fastener 5 is any one of a bolt, a rivet and a screw.

[0058] In some embodiments, the reinforcing mesh 22 is a metal mesh having a wire connection portion for connecting to the power source 3 via a wire to generate heat.

[0059] Reference Figure 6 After the prefabricated node 2 is fixedly connected to the pultruded profile 1, a prefabricated node-type pultruded profile is formed. During on-site construction, the first prefabricated node-type pultruded profile 110 and the second prefabricated node-type pultruded profile 120 are butt-jointed at both ends and bolted together with the connecting plate 4. The connecting plate 4 covers the outer surface of the prefabricated node 2. This embodiment is equivalent to adding the prefabricated node 2 in advance before the original pultruded profile is connected, strengthening it in advance, and cooperating with the subsequent bolt connection.

[0060] Reference Figure 7 , Figure 8 , Fig. 9 and Fig.10 , trough-shaped, angle-shaped, flat-plate-shaped and box-shaped pultruded profiles can all be connected to the prefabricated node 2 and then bolted. The connection position of the prefabricated node 2 is shown in the figure.

[0061] The prefabricated node-type pultruded profile connection structure based on the resistance fusion welding technology in the above embodiment has the following advantages and technical effects:

[0062] 1. Good shear resistance and high connection bearing capacity. The high strength of the reinforcing mesh 22 can improve the tensile, compressive and shearing properties of the pultruded profile itself, and can make up for the reduction in bearing capacity caused by defects and damage caused by welding. The addition of the reinforcing mesh 22 to the bolt connection system can effectively increase the shear performance of the connection node, thereby increasing the bearing capacity and durability of the bolt node connection.

[0063] 2. The operation process is simple and the construction efficiency is high. Prefabricated node-type pultruded profiles can be prefabricated in the factory before construction.

[0064] 3. High application flexibility. It is not limited to connections under certain circumstances, and all parts of the prefabricated nodes can be used.

[0065] 4. Reduce the damage of thermosetting resin-based pultruded profiles. The melting temperature of thermoplastic resin film is lower than the damage temperature of thermosetting resin-based pultruded profiles (consider the resin types of thermosetting resin-based pultruded profiles and thermoplastic resin film).

[0066] 5. Good corrosion resistance. Thermoplastic resin film provides corrosion resistance protection for the reinforced mesh.

[0067] Reference Fig.11 The embodiment of the present invention also provides a method for connecting prefabricated node-type pultruded profiles based on resistance fusion welding technology. Based on the connection structure, the connection method includes the following steps:

[0068] S1. Prefabricated node production steps: apply the first welding sheet 21 to the connecting section of the pultruded profile 1, weld the reinforcing mesh 22 to the first welding sheet 21, apply the second welding sheet 23 to the reinforcing mesh 22, energize the reinforcing mesh 22, and the reinforcing mesh 22 melts the first welding sheet 21 and the second welding sheet 23. After the first welding sheet 21 and the second welding sheet 23 are cooled, the reinforcing mesh 22 is fixed on the connecting section of the pultruded profile 1 to form a prefabricated node 2.

[0069] Reference Figure 3 First, clean the surface of the connecting section of the pultruded profile 1 and coat a layer of thermoplastic resin film on the outer surface of the pultruded profile 1; secondly, weld a reinforcing mesh 22 on the outer surface of the thermoplastic resin film and fix it on the surface of the pultruded profile 1; then, coat another layer of thermoplastic resin film on the outer surface of the reinforcing mesh 22; finally, utilize the characteristics of thermoplastic resin that it softens when heated and hardens when cooled to energize the reinforcing mesh 22 to generate heat and melt the two layers of thermoplastic resin film, so that the entire prefabricated node 2 is tightly connected to the surface of the pultruded profile 1.

[0070] S2, fastener connection step: the two ends of the connection plate 4 are respectively arranged on the prefabricated nodes 2 of the connection sections of the two pultruded profiles 1, and the fasteners 5 connect the connection plate 4, the prefabricated nodes 2 and the connection sections of the pultruded profiles 1 as a whole.

[0071] In some embodiments, the prefabricated node manufacturing step is completed in a factory, and the fastener connection step is completed at the construction site, which can greatly save the time required for preparing materials at the construction site.

[0072] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0073] In the present invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or replace features of other embodiments.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology, characterized in that: It comprises a first welding sheet (21), a reinforcing mesh sheet (22) and a second welding sheet (23) which are sequentially arranged on a connecting section of a pultruded profile (1); and a connecting plate (4) and a fastener (5) for connecting two connecting sections of the pultruded profiles (1); The first welding sheet (21) and the second welding sheet (23) are used to fix the reinforcing mesh sheet (22) to the connecting section of the pultruded profile (1) after melting to form a prefabricated node (2); The two ends of the connecting plate (4) are respectively arranged on the prefabricated nodes (2) of the connecting sections of the two pultruded profiles (1), and the fasteners (5) are used to connect the connecting plate (4), the prefabricated nodes (2) and the connecting sections of the pultruded profiles (1) into one body, so as to connect the two pultruded profiles (1).

2. The prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology according to claim 1 is characterized in that: The pultruded profile (1) is a thermosetting resin-based pultruded profile; The first welding sheet (21) and the second welding sheet (23) are thermoplastic resin films; The damage temperature of the pultruded profile (1) is higher than the melting point temperature of the first welding sheet (21) and the second welding sheet (23).

3. The prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology according to claim 2 is characterized in that: The fiber of the pultruded profile (1) is any one of glass fiber, carbon fiber, basalt fiber and aramid fiber.

4. The prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology according to claim 2 is characterized in that: When the resin of the thermosetting resin-based pultruded profile is polyetherimide or polyamide resin, the resin of the thermoplastic resin film is vinyl resin or epoxy resin.

5. The prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology according to claim 1 is characterized in that: The thickness of the first welding sheet (21) and the second welding sheet (23) is 0.1 mm-0.3 mm.

6. The prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology according to claim 1 is characterized in that: The reinforcing mesh (22) is any one of a steel mesh, an iron mesh and a stainless steel mesh.

7. The prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology according to claim 1 is characterized in that: The fastener (5) is any one of a bolt, a rivet and a screw.

8. The prefabricated node-type pultruded profile connection structure based on resistance fusion welding technology according to claim 1, characterized in that: The reinforcing mesh (22) is a metal mesh having a wire connection portion for connecting to a power source (3) via a wire to generate heat.

9. A method for connecting prefabricated node-type pultruded profiles based on resistance welding technology, based on the prefabricated node-type pultruded profile connection structure based on resistance welding technology according to any one of claims 1 to 8, characterized in that: The connection method comprises the following steps: The prefabricated node manufacturing steps include: coating a first welding sheet (21) on the connecting section of the pultruded profile (1), welding a reinforcing mesh sheet (22) on the first welding sheet (21), coating a second welding sheet (23) on the reinforcing mesh sheet (22), electrifying the reinforcing mesh sheet (22), causing the reinforcing mesh sheet (22) to melt the first welding sheet (21) and the second welding sheet (23), and after the first welding sheet (21) and the second welding sheet (23) are cooled, the reinforcing mesh sheet (22) is fixed on the connecting section of the pultruded profile (1) to form a prefabricated node (2); The fastener connection step comprises: arranging the two ends of the connection plate (4) on the prefabricated nodes (2) of the connection sections of the two pultruded profiles (1) respectively, and connecting the connection plate (4), the prefabricated nodes (2) and the connection sections of the pultruded profiles (1) together with the fasteners (5).

10. The method for connecting prefabricated node-type pultruded profiles based on resistance fusion welding technology according to claim 9, characterized in that: The prefabricated node manufacturing step is completed in a factory, and the fastener connection step is completed at a construction site.

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