Connection structure and method between steel column and lower strong beam of sandwich composite

Abstract

The application relates to a connecting structure and method between a steel column and a lower strong cross beam of a sandwich composite material, characterized by comprising, from top to bottom, a connecting piece connected with the steel column, a bonding layer, an upper composite deck reinforcing layer, a pre-embedded composite reinforcing structure, a reinforced core layer and a lower composite deck reinforcing layer; an embedded sealing sleeve is arranged between the pre-embedded composite reinforcing structure and the reinforced core layer; the embedded sealing sleeve is fixedly connected with the pre-embedded composite reinforcing structure and the reinforced core layer in periphery; the embedded sealing sleeve is connected with a fastener; the fastener is fixedly connected with the embedded sealing sleeve after sequentially penetrating through the connecting piece, the bonding layer and the upper composite deck reinforcing layer. The application can realize effective connection between the steel column and the composite sandwich structure and effective transmission of structural load, plays a supporting role on the composite superstructure deck grillage of a ship, and guarantees the strength and rigidity of the deck structure.

Description

Technical Field

[0001] This invention relates to the field of marine composite material applications, specifically to a connection structure and method between a marine steel column and a sandwich composite material lower strong crossbeam. Background Technology

[0002] The composite material structures used in surface warships mainly refer to resin-based fiber-reinforced composite materials. Composite materials have many advantages, such as high designability and high specific strength. Through functional design, the hull structure of surface warships can have multiple functions, including lightweighting, load-bearing capacity, stealth, and protection.

[0003] For naval composite superstructures, the compartment dimensions are required to meet functional and layout requirements, necessitating the use of supporting columns to achieve these requirements. Based on structural stiffness, buckling resistance, and fire resistance requirements, steel columns are the preferred supporting structure type. The connection between the steel columns and the composite deck must consider both the effective transfer and transition of structural loads, the ease of on-site installation of the steel columns, and the prevention of localized damage and leakage at the connection points under actual maritime service conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to propose a connection structure and method between a steel column and a sandwich composite material lower strong beam for marine applications, which can effectively transfer structural loads between steel support columns and composite material decks, in order to address the shortcomings of the prior art.

[0005] The technical solution adopted in this invention is as follows: A connection structure between a marine steel column and a sandwich composite material lower reinforcing beam is characterized by comprising, from top to bottom, a composite material deck, a composite material beam, a pre-embedded composite material reinforcing structure, an adhesive layer, a steel column connector, and a steel column. An embedded sealing sleeve is provided between the composite material beam and the pre-embedded composite material reinforcing structure. The outer periphery of the embedded sealing sleeve is fixedly connected to the composite material beam and the pre-embedded composite material reinforcing structure. The embedded sealing sleeve is used to connect with fasteners. The fasteners pass through the steel column connector, the adhesive layer, and the composite material beam reinforcing layup in sequence before being fixedly connected to the embedded sealing sleeve.

[0006] According to the above technical solution, the cross-section of the composite material beam is an inverted trapezoidal structure, with a reinforcing core layer inside. A groove is provided at the lower end of the reinforcing core layer, and the pre-embedded composite material reinforcement structure is set in the groove. A composite material beam reinforcement layer is provided on the outer periphery of the reinforcing core layer.

[0007] According to the above technical solution, the diameter of the steel column connector is... L1, the design width of the top panel of the composite material beam is L2×L2, where L1<L2.

[0008] According to the above technical solution, the steel column connector is a flange structure.

[0009] According to the above technical solution, the embedded composite material reinforcement structure is rigid foam with a density of 180~220kg / m3; According to the above technical solution, the reinforcing core layer of the composite beam is rigid foam with a density of 80~130 kg / m3.

[0010] According to the above technical solution, the thickness of the pre-embedded composite material is 8~10mm; the thickness of the composite material beam is 120~230mm.

[0011] According to the above technical solution, the embedded sealing sleeve is an embedded sealing threaded sleeve, and the fastener is a fastening bolt.

[0012] According to the above technical solution, the fastener is a detachable fastening bolt.

[0013] A method for connecting a marine steel column and a sandwich composite material lower reinforcing beam is characterized by the following steps: First, the steel column connector is pre-welded and assembled to the upper end of the steel column. Then, a pre-embedded composite material reinforcing structure is pre-embedded inside the reinforcing core layer of the composite material beam during the manufacturing stage, thereby integrally forming the composite material reinforcing beam structure. Next, an embedded sealing sleeve is installed between the pre-embedded composite material reinforcing structure and the reinforcing core layer using adhesive. A secondary curing process is then used to assemble the composite material reinforcing beam onto the composite material deck. During installation, an adhesive layer is applied to the lower end of the steel column connector, and then fasteners are sequentially passed through the steel column connector, the adhesive layer, and the composite material beam reinforcing layer before being fixedly connected to the embedded sealing sleeve.

[0014] The beneficial effects of this invention are as follows: 1. Due to the small modulus of the composite sandwich structure, a locally embedded composite reinforcement structure and a reinforced core layer of the composite beam are arranged at the connection between the steel column and the composite deck. This ensures effective overall structural stiffness and a gradient transition, enabling effective connection between the steel column and the composite sandwich structure and effective transfer of structural loads. It also supports the composite superstructure deck frame of the ship, ensuring the strength and stiffness of the deck structure. Furthermore, by adopting a hybrid connection method of "embedded sealing sleeve and fastener connection + adhesive bonding", the advantages of adhesive bonding and mechanical connection can be fully utilized to achieve both a hard connection between the column and the deck structure and a sealing between the connection interfaces, ensuring the stability of the connection structure under environmental conditions during long service life.

[0015] 2. During the design phase, the reinforced core layer is strengthened with rigid foam (density 200kg / m³). 3 Furthermore, the addition of pre-embedded composite material reinforcement structures and local steel flange connections not only enhances the load-bearing stiffness of the local structure but also distributes the load to nearby structures, ensuring the strength and stiffness of the deck structure.

[0016] 3. The embedded sealing sleeve in this invention is an embedded sealing threaded sleeve, and the fastener is a detachable fastening bolt. The embedded threaded sleeve is a self-tapping threaded sleeve, which has the ability to tap its own threads and can be directly screwed into the pre-drilled hole in the sandwich structure. After applying structural adhesive to the surface of the self-tapping threaded sleeve, it is screwed into the substrate, resulting in a tight and gapless bond with the substrate, achieving stronger load-bearing capacity, vibration resistance, and anti-loosening capabilities. The "embedded threaded sleeve + bolt" assembly process improves the reliability of the connection structure while ensuring the safety of the composite material deck structure, avoiding secondary damage such as water leakage caused by deck perforation.

[0017] 4. The connection structure adopts a detachable and reassembleable design. The steel support column and composite material deck structure can be separated by removing the bolts. The embedded threaded sleeves arranged in the connection structure are reusable, and the steel support column can also be reassembled. This detachable and reassembleable design of the connection structure will significantly increase the engineering convenience for repair and maintenance of the composite material superstructure and for potential future structural modifications. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an isometric view of the overall connection structure between the marine steel column and the sandwich composite material lower strong beam provided in this embodiment of the invention.

[0020] Figure 2 for Figure 1 Top view.

[0021] Figure 3 This is a cross-sectional view of the connection structure between the marine steel column and the sandwich composite material lower strong beam provided in an embodiment of the present invention.

[0022] Figure 4 This is a finite simulation analysis diagram of an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Example 1 like Figure 1 , 2 As shown in Figure 3, this embodiment provides a connection structure between a marine steel column and a sandwich composite material lower reinforcing beam, including a composite material deck 5, a composite material beam 4, a pre-embedded composite material reinforcing structure 6, an adhesive layer 3, a steel column connector 2, and a steel column 1 arranged sequentially from top to bottom. An embedded sealing sleeve 7 is provided between the composite material beam and the pre-embedded composite material reinforcing structure. The outer periphery of the embedded sealing sleeve 7 is fixedly connected to the composite material beam and the pre-embedded composite material reinforcing structure. The embedded sealing sleeve 7 is used to connect with a fastener 8. The fastener 8 passes through the steel column connector, the adhesive layer, and the composite material beam reinforcing layup in sequence before being fixedly connected to the embedded sealing sleeve.

[0025] In this embodiment, the cross-section of the composite material beam 4 is an inverted trapezoidal structure with a reinforcing core layer inside. A groove is provided at the lower end of the reinforcing core layer, and the pre-embedded composite material reinforcing structure 6 is set in the groove. A composite material beam reinforcing layer is provided on the outer periphery of the reinforcing core layer.

[0026] The pre-embedded composite material reinforcement structure 6 is a circular structure, and the diameter of the steel column connector is [missing information]. L1, the design width of the top panel of the composite material beam is L2×L2, where L1 < L2. Finite element simulation is as follows: Figure 4 As shown in the diagram, the localized concentrated force caused by the steel column is effectively borne by the connection structure with overall enhanced local stiffness. This stiffness is then gradually transferred to the adjacent deck structure through a progressively decreasing range of reinforcing parameters, including the adhesive layer, the embedded composite material reinforcement structure, and the reinforced core layer, ensuring an effective transition in stiffness. All reinforcing parameters utilize circular structures to effectively eliminate stress concentration at the apex of the rectangular reinforcement structure, ensuring a smooth stress transition. The thickness of the embedded composite material is as follows: the reinforced core layer is 200 mm thick; the composite material beam reinforcement layer is 4 mm thick.

[0027] In this embodiment, the connector connected to the steel column is a steel flange; the adhesive layer 3 is a high-toughness structural adhesive; and the embedded composite material reinforcement structure is rigid foam with a density of 180~220 kg / m³. 3 .

[0028] In this embodiment, the embedded sealing sleeve 7 is an embedded sealing threaded sleeve. The embedded threaded sleeve is a self-tapping threaded sleeve, capable of self-tapping threads. It can be directly screwed into the pre-drilled holes in the pre-embedded composite material reinforcement structure and the reinforcing core layer. After applying structural adhesive to the surface of the self-tapping threaded sleeve, it is screwed into the substrate, resulting in a tight, gapless bond with the substrate and achieving stronger load-bearing capacity, vibration resistance, and anti-loosening capabilities. The fastener 8 is a detachable fastening bolt. The detachable and reassembleable design of the connection structure significantly increases the engineering convenience for repairing and maintaining the composite material superstructure and for potential future structural modifications. The "embedded threaded sleeve + bolt" assembly process improves the reliability of the connection structure while ensuring the safety of the composite material deck structure, avoiding secondary damage such as water leakage caused by deck perforation. Removing the bolt allows separation of the steel support column from the composite material deck structure. The embedded threaded sleeves arranged in the connection structure are reusable and also enable the reassembly of the steel support column. The detachable and reassembleable design of the connection structure significantly increases the engineering convenience for repairing and maintaining the composite material superstructure and for potential future structural modifications.

[0029] Example 2 This embodiment 2 provides a method for connecting a marine steel column and a sandwich composite material deck structure, including the following steps: 1) The steel column 1 is processed and shaped; 2) The steel column flange connector 2 is processed and shaped, and its connecting surface is leveled. It is then welded and assembled onto the top of the steel column 1. 3) The composite material strong beam 4 is manufactured and formed. During the manufacturing process using the VARI process, the reinforced core layer and the pre-embedded composite material reinforcing structure 6 are first pre-embedded into the design-specified position, and then the composite material strong beam structure is integrally formed. 3) An embedded sealing sleeve 7 is then installed between the pre-embedded composite material reinforced structure and the reinforced core layer using adhesive. 4) A secondary curing process is used to assemble the composite material strong crossbeam 4 onto the composite material deck 5; 4) On-site verification and adaptation to determine the specific arrangement of the steel column 1 on the composite material strong beam 4; 5) Apply high-toughness structural adhesive evenly to the steel flange surface, and then assemble it at the designated position on the composite material strong beam 4. 7) Apply high-toughness structural adhesive evenly to the bolt 8 fastener and fasten it to the embedded threaded sleeve. Then, pass the fastener through the steel column connector, adhesive layer and composite material beam reinforcement layup in sequence and connect it to the embedded sealing sleeve. After the connecting resin cures, the overall connection structure is completed.

[0030] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A connection structure between a marine steel column and a sandwich composite material lower reinforcing beam, characterized in that: The device includes, from top to bottom, a composite material deck, a composite material beam, a pre-embedded composite material reinforcement structure, an adhesive layer, a steel column connector, and a steel column. An embedded sealing sleeve is provided between the composite material beam and the pre-embedded composite material reinforcement structure. The outer periphery of the embedded sealing sleeve is fixedly connected to the composite material beam and the pre-embedded composite material reinforcement structure. The embedded sealing sleeve is used to connect with fasteners. The fasteners pass through the steel column connector, the adhesive layer, and the composite material beam reinforcement layup in sequence before being fixedly connected to the embedded sealing sleeve.

2. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 1, characterized in that: The cross-section of the composite material beam is an inverted trapezoidal structure with a reinforcing core layer inside. A groove is provided at the lower end of the reinforcing core layer, and the pre-embedded composite material reinforcement structure is set in the groove. A composite material beam reinforcement layer is provided on the outer periphery of the reinforcing core layer.

3. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 1 or 2, characterized in that: The diameter of the steel column connector is L1, the design width of the top panel of the composite material beam is L2×L2, where L1<L2.

4. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 1 or 2, characterized in that: The steel column connector is a flange structure.

5. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 1 or 2, characterized in that: The embedded composite material reinforcement structure is made of rigid foam with a density of 180~220 kg / m³. 3 .

6. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 1 or 2, characterized in that: The reinforcing core of the composite beam is rigid foam with a density of 80~130 kg / m³. 3 .

7. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 1 or 2, characterized in that: The thickness of the pre-embedded composite material is 8~10mm; the thickness of the composite material beam is 120~230mm.

8. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 1 or 2, characterized in that: The embedded sealing sleeve is an embedded sealing threaded sleeve, and the fastener is a fastening bolt.

9. The connection structure between the marine steel column and the sandwich composite material lower strong crossbeam according to claim 8, characterized in that: The fastener is a detachable fastening bolt.

10. A method for connecting a marine steel column and a sandwich composite material lower rigid beam, characterized in that: The process includes the following steps: First, steel column connectors are pre-welded and assembled onto the upper end of the steel column. Then, a pre-embedded composite material reinforcement structure is pre-embedded into the reinforced core layer of the composite material beam during the manufacturing stage, thus integrally forming the composite material strong beam structure. Next, an embedded sealing sleeve is installed between the pre-embedded composite material reinforcement structure and the reinforced core layer using adhesive. A secondary curing process is then employed to assemble the composite material strong beam onto the composite material deck. During installation, an adhesive layer is applied to the lower end of the steel column connector, and then fasteners are sequentially passed through the steel column connector, the adhesive layer, and the composite material beam reinforcement layer before being fixedly connected to the embedded sealing sleeve.

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