Connecting mechanism for marine composite laminboard supported by I-shaped steel

Abstract

The invention relates to the technical field of connection of marine heterogeneous materials, and discloses a marine composite laminboard connecting mechanism supported by I-shaped steel, which comprises a steel connecting mechanism, a composite laminboard structure, I-shaped steel, ceramic wool and a thin steel plate. The steel connecting structure is arranged at the whole-gear or half-gear strong frame, the left and right sides are connected with the composite sandwich boards, the bottom is connected with the I-shaped steel, and the outer side can be connected with the ceramic wool and the thin steel plate to improve the fireproof grade. The composite laminboard and the steel structure are connected in a pre-embedding and welding mode, shear stress at a traditional connection interface is mainly optimized, stress concentration is optimized into surface contact and line contact, the stress concentration degree is remarkably reduced, the safety of the whole structure is improved, and the service life of the whole structure is prolonged. The problems that a conventional connection technology is low in load transmission efficiency, poor in deformation coordination, insufficient in connection strength and the like are solved, and the method is suitable for the connection scene of the composite sandwich panel and the steel structure with the high connection strength requirement.

Description

Technical Field

[0001] The invention relates to the technical field of ship heterogeneous material connection, and in particular to a ship composite material sandwich panel connection mechanism supported by an I-beam. Background Art

[0002] Composite sandwich panel structures are widely used in many fields such as aviation, aerospace, shipbuilding, automobiles, and construction due to their excellent advantages such as light weight, high specific strength, strong anti-buckling performance, vibration reduction and sound insulation, and corrosion resistance. The use of composite sandwich panel structures to replace the traditional steel superstructure of ships can not only effectively reduce weight, but also reduce the center of gravity of the ship, which is beneficial to improve the stability of the ship's navigation. When using composite sandwich panels, it is inevitable to connect them with the main hull steel structure. Due to the difference in material properties, stress concentration will occur in the connection area, which will cause the sandwich panel structure to be damaged at the connection. If the sandwich panel is subjected to a large load, more load will be transferred to the connection mechanism. Therefore, for application scenarios with high connection strength requirements, the use of a reasonable connection mechanism is the key to ensuring the safety and reliability of the overall structure.

[0003] The traditional method to improve the connection strength is to thicken the core layer of the connection area or pre-embed a core layer structure with a larger elastic modulus, and then connect the composite sandwich panel to the steel deck through mechanical connection or bonding. Mechanical connection is mainly bolt connection, which has the advantages of easy disassembly and maintenance, but the bearing capacity of the sandwich panel structure is greatly reduced due to the existence of bolt connection. Under the action of large preload, the sandwich panel is easy to tear due to insufficient bearing strength; although the bonding method has strong shear resistance in certain directions, it has poor peeling resistance, and it is easy to cause debonding, layer and board delamination at the connection point, which is not easy to find, and eventually structural damage occurs; pre-embedded metal structures or structures with a larger elastic modulus in composite materials can achieve the purpose of improving the connection strength, but since the embedded parts are not directly connected to the external steel structure, stress concentration will still occur at the connection interface where the connecting bolts pass through the surface skin of the sandwich panel and the embedded parts, so it is not suitable for application scenarios with high connection strength requirements. At the same time, it is limited by the design thickness of the sandwich panel and the bolt-through connection method, which limits the scope of use of the pre-embedded design. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing connection method of marine composite sandwich panels has low strength and is easy to deform and damage.

[0005] In order to solve the above technical problems, the technical solution of the present invention is to provide a marine composite sandwich panel connection mechanism supported by an I-beam, comprising a steel connection structure, a composite sandwich panel structure and an I-beam, wherein the composite sandwich panel structure is connected to both sides of the steel connection structure, and the I-beam is connected to the bottom of the steel connection structure, and the three form a symmetrical structure, wherein the steel connection structure comprises a vertical support plate and a steel pipe, steel pipes are arranged on both sides of the vertical support plate, the composite sandwich panel structure is connected to the steel pipe, and the I-beam is connected to the bottom of the vertical support plate.

[0006] Optionally, the vertical support plate includes a left vertical support plate and a right vertical support plate, both of which have the same structure and are symmetrically arranged. The left vertical support plate and the right vertical support plate are welded to each other. A protrusion is provided in the middle of the side opposite to the connection point on the left vertical support plate and the right vertical support plate, and the steel pipe is welded to the protrusion.

[0007] Optionally, reinforcing elbow plates are provided on both sides of the connection between the left vertical support plate and the right vertical support plate, and a connecting structure panel is welded above the left vertical support plate and the right vertical support plate.

[0008] Optionally, the steel pipe is an inclined D-shaped steel pipe, including a left inclined D-shaped steel pipe and a right inclined D-shaped steel pipe, both of which have the same structure, the left inclined D-shaped steel pipe is welded to the left vertical support plate, and the right inclined D-shaped steel pipe is welded to the right vertical support plate.

[0009] Optionally, the left inclined D-shaped steel pipe includes an upper horizontal plane, a vertical plane, a lower horizontal plane and an inclined side surface, and the surfaces are connected in turn by arc surfaces. The thickness of the vertical plane and the arc surface at the connection with the upper horizontal plane and the lower horizontal plane is greater than the thickness of the other surfaces, and the protrusion of the left vertical support plate is welded on the vertical plane.

[0010] Optionally, the composite sandwich panel structure includes an upper skin, a lower skin and multiple core materials, the core materials are trapezoidal hollow tubes, the core materials are bonded to each other, the oblique side surfaces of the left oblique D-shaped steel tube are bonded to the adjacent core materials, the upper skin and the lower skin respectively cover the core material and the upper and lower sides of the left oblique D-shaped steel tube and the vertical surface of the left oblique D-shaped steel tube, and notches corresponding to the protrusions are left on the vertical surfaces.

[0011] Optionally, the upper surface of the connecting structure panel of the steel connecting mechanism is flush with the upper surface of the upper skin.

[0012] Optionally, the I-beam includes an I-beam upper panel, an I-beam lower panel and an I-beam web, and symmetrically arranged lateral reinforcing elbow plates are provided on both sides of the I-beam web. The I-beam upper panel is welded to a vertical support plate of a steel connecting structure, and the width of the I-beam upper panel is greater than the width of the steel connecting structure.

[0013] Optionally, the reinforcing bracket and the I-beam web are located in the same plane.

[0014] Optionally, an upper ceramic wool is provided above the upper skin of the composite sandwich panel structure, a lower ceramic wool is provided below the lower skin, an upper thin steel plate is provided outside the upper ceramic wool, and a lower thin steel plate is provided outside the lower ceramic wool. The upper thin steel plate is connected to the connecting structure panel by bolts, and the lower thin steel plate is welded to the upper panel of the I-beam.

[0015] In summary, the present invention has at least one of the following beneficial effects:

[0016] 1. The present invention welds the inclined D-shaped steel pipe to the vertical support plate, and then pre-buries the core material into the end of the composite sandwich panel. The vertical support plate is then welded to achieve rigid connection of the sandwich panels on both sides. The vertical support plate and the I-beam are connected by steel fillet welds. Steel welding is used instead of mechanical connection and bonding of composite materials. The shear stress at the traditional connection interface is mainly used, and the stress concentration is optimized to surface contact and line contact, which significantly reduces the stress concentration and improves the safety of the overall structure. The problems of low load transfer efficiency, poor deformation coordination, insufficient connection strength, etc. in conventional connection technologies are solved. The present invention is suitable for connection scenarios where composite sandwich panels and steel structures have high connection strength requirements.

[0017] 2. The present invention performs rounding and inner circle thickening treatment on the steel structure and composite sandwich panel in the connection area, which can further improve the connection strength.

[0018] 3. The present invention adopts isosceles trapezoidal hollow tubes as the core material of the sandwich panel, which not only fully improves the bending resistance and shear resistance of the sandwich panel structure, but also saves pipe brackets.

[0019] 4. The laying of the ceramic wool of the present invention improves the flame retardancy of the sandwich panel structure, and is suitable for upper construction sites with higher fire protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the middle inclined D-shaped steel section;

[0022] Figure 3 It is an exploded view of the structure of the present invention;

[0023] Figure 4 An exploded view of another embodiment of the present invention;

[0024] Figure 5 for Figure 1 AA section view;

[0025] In the figure: 1. Steel connecting mechanism; 11. Left vertical support plate; 12. Right vertical support plate; 13. Left oblique D-shaped steel pipe; 131. Upper horizontal plane; 132. Lower horizontal plane; 133. Vertical plane; 134. Oblique side surface; 14. Right oblique D-shaped steel pipe; 15. Connecting mechanism panel; 16. Strengthening bracket; 17. Bolt; 2. Composite sandwich panel structure; 21. Upper skin; 22. Lower skin; 23. Core material; 3. I-beam; 31. I-beam upper panel; 32. I-beam web; 33. I-beam lower panel; 34. I-beam strengthening bracket; 41. Upper ceramic wool; 42. Lower ceramic wool; 51. Upper thin steel plate; 52. Lower thin steel plate. DETAILED DESCRIPTION

[0026] The following combination Figure 1-5 The present invention is described in further detail.

[0027] The present invention discloses a composite material sandwich panel connection mechanism for ships supported by I-beams, referring to Figure 1 and Figure 5 , including a steel connection structure 1, a composite sandwich panel structure 2 and an I-beam 3. The steel connection mechanism 1 is arranged at a full-grade or half-grade strong frame. When subjected to a large load, it can be densely arranged at the half-grade strong frame to improve the safety of the overall structure. The composite sandwich panel structure 2 is connected to both sides of the steel connection structure 1, and the I-beam 3 is connected to the bottom of the steel connection structure 1. The three form a symmetrical structure. The steel connection structure 1 includes a vertical support plate and a steel pipe. Steel pipes are arranged on both sides of the vertical support plate. The composite sandwich panel structure 2 is connected to the steel pipe. The I-beam 3 is connected to the bottom of the vertical support plate. The I-beam 3 is used to replace the deck and the steel longitudinal girder or strong transverse beam. It is the main force-bearing structure and provides support for the composite sandwich panel structure 2 and the steel connection mechanism 1.

[0028] In a further embodiment, referring to Figure 3 The vertical support plate includes a left vertical support plate 11 and a right vertical support plate 12, which have the same structure and are symmetrically arranged. The left vertical support plate 11 and the right vertical support plate 12 are welded and connected. A protrusion is provided in the middle of the side opposite to the connection on the left vertical support plate 11 and the right vertical support plate 12, and the steel pipe is welded on the protrusion. On the one hand, the structural integrity of the sandwich panel skin at the turning point is guaranteed as much as possible, and on the other hand, a certain construction space is reserved, and the outer side of the vertical support plate is appropriately chamfered to relieve stress concentration; the vertical support plates on both sides are butt-jointed in the middle, the bottom is welded to the upper panel 31 of the I-beam, and the top is welded to the connecting structure panel 15; reinforcing elbow plates 16 are provided on both sides of the connection between the left vertical support plate 11 and the right vertical support plate 12, and the connecting structure panel 15 is welded above the left vertical support plate 11 and the right vertical support plate 12.

[0029] Another possible solution is to refer to Figure 4The oblique D-shaped steel pipe is welded to the shoulder part of the vertical support plate as a whole and directly pre-buried in the composite sandwich panel structure 2. The cross section of the vertical support plate exposes the fiber-reinforced skin, which becomes the boundary hard line of the sandwich panel and is then welded to other vertical support plates.

[0030] In a further embodiment, referring to Figure 2 The steel pipe is an oblique D-shaped steel pipe, including a left oblique D-shaped steel pipe 13 and a right oblique D-shaped steel pipe 14, both of which have the same structure. The left oblique D-shaped steel pipe 13 is welded to the left vertical support plate 11, and the right oblique D-shaped steel pipe 14 is welded to the right vertical support plate 12. Taking the left oblique D-shaped steel pipe 13 as an example, the left oblique D-shaped steel pipe 13 includes an upper horizontal surface 131, a vertical surface 133, a lower horizontal surface 132 and an oblique side surface 134, and each surface is connected by an arc surface in this way. It can be rolled into shape at one time, or it can be formed by bending a flat plate and then welding. The manufacturing process is simple, and the protrusion of the left vertical support plate 11 is welded to the vertical surface 133;

[0031] The following design measures are taken for the left inclined D-shaped steel tube 13 to improve the load transfer efficiency and deformation coordination between heterogeneous structures: first, the inner circle in the contact area with the composite sandwich panel structure 2 is thickened to improve the connection strength. The thickened area mainly includes the vertical surface 133 and the first arc surface R1 and the second arc surface R2 at the connection between the vertical surface 133 and the upper horizontal surface 131 and the lower horizontal surface 132; second, the outer circle is ensured to fit closely with the composite sandwich panel structure 2. The inclination angle of the inclined side surface 134 should be the same as the inclination angle of the web of the sandwich panel core material 23. In addition, the outer surfaces of the upper horizontal surface 131 and the lower horizontal surface 132 should be appropriately retracted to reserve space for the local thickening of the skin 21 and the lower skin 22 on the sandwich panel.

[0032] In a further embodiment, the composite sandwich panel structure 2 includes an upper skin 21, a lower skin 22 and a plurality of core materials 23, all of which are made of resin-based reinforced fiber laminates. The core material 23 is a trapezoidal hollow tube. The core materials 23 are staggered and bonded. The core material 23 is bonded to the upper skin 21 and the lower skin 22. The oblique side surface 134 of the left oblique D-shaped steel tube 13 is bonded to the adjacent core material 23. The inclination angle of the oblique side surface 134 is the same as the inclination angle of the web of the core material 23. The upper skin 21 and the lower skin 22 are arranged horizontally and aligned, respectively covering the core material 23 and the left oblique D-shaped steel tube 13. The upper and lower sides of the steel tube 13 and the vertical surface 133 of the left oblique D-shaped steel tube 13 are connected as a whole, and the corners are rounded, the inner circle of the contact area with the oblique D-shaped steel tube is thickened, and a notch corresponding to the protrusion is left on the vertical surface 133. The upper surface of the connecting structure panel 15 of the steel connecting mechanism 1 is flush with the upper surface of the upper skin 21 to ensure the flatness of the structure. In addition, an oblique D-shaped steel tube is provided at each end of the composite sandwich panel structure 2 to serve as a steel core material. The oblique D-shaped steel tube is in surface contact with the composite sandwich panel structure 2, which can fully improve the stress distribution between layers;

[0033] Specifically, an isosceles trapezoidal hollow tube is used as the core material 23. Under the condition of equal weight, not only can the bending and shearing properties of the composite sandwich panel structure 2 be fully improved, but also the cable pipe system can be pre-buried, thereby saving the bracket structure; the upper skin 21 and the lower skin 22 are connected as a whole, the structural integrity of the skin is guaranteed as much as possible, the corners are rounded, and the inner circle of the contact area with the left oblique D-shaped steel pipe 13 and the right oblique D-shaped steel pipe 14 is thickened.

[0034] In a further embodiment, the I-beam 3 includes an I-beam upper panel 31, an I-beam lower panel 33 and an I-beam web 32. Symmetrically arranged lateral reinforcing elbow plates 34 are provided on both sides of the I-beam web 32. The components are connected by corner welds. The I-beam upper panel 31 is welded to the vertical support plate of the steel connection structure 1, and the width of the I-beam upper panel 31 is greater than the width of the steel connection structure 1. The reinforcing elbow plate 16 and the I-beam web 32 are located in the same plane, which is used to improve the strength and stability of the steel connection mechanism 1.

[0035] In a further embodiment, an upper ceramic wool 41 is provided above the upper skin 21 of the composite sandwich panel structure 2, and a lower ceramic wool 42 is provided below the lower skin 22. An upper thin steel plate 51 is provided outside the upper ceramic wool 41, and a lower thin steel plate 52 is provided outside the lower ceramic wool 42. The upper thin steel plate 51 is connected to the connecting structure panel 15 by bolts 17, and the lower thin steel plate 52 is welded to the I-beam upper panel 31. The protection grade of the upper ceramic wool 41 and the lower ceramic wool 42 is at least A15, and the thickness of the upper thin steel plate 51 and the lower thin steel plate 52 is 0.2-0.5 mm, which will not increase too much weight.

[0036] The present invention welds the inclined D-shaped steel pipe to a part of the vertical support plate, and then pre-buries the pipe as the core material into the end of the composite sandwich panel structure 2, and then realizes the rigid connection of the sandwich panels on both sides by welding the vertical support plates, and realizes the connection between the vertical support plate and the I-beam 3 by steel fillet welds, and uses steel welding to replace the mechanical connection and bonding method of the composite material, and optimizes the shear stress at the traditional connection interface to be the main stress and stress concentration to surface contact and line contact, which significantly reduces the stress concentration degree and improves the safety of the overall structure, solves the problems of low load transfer efficiency, poor deformation coordination, insufficient connection strength, etc. existing in conventional connection technologies, and is suitable for connection scenarios where composite sandwich panels and steel structures have high connection strength requirements.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A marine composite sandwich panel connection mechanism supported by an I-beam, characterized in that: The invention comprises a steel connection structure (1), a composite sandwich panel structure (2) and an I-beam (3), wherein the composite sandwich panel structure (2) is connected to both sides of the steel connection structure (1), and the I-beam (3) is connected to the bottom of the steel connection structure (1), and the three form a symmetrical structure, wherein the steel connection structure (1) comprises a vertical support plate and a steel pipe, steel pipes are arranged on both sides of the vertical support plate, the composite sandwich panel structure (2) is connected to the steel pipe, and the I-beam (3) is connected to the bottom of the vertical support plate.

2. The I-beam supported marine composite sandwich panel connection mechanism according to claim 1, characterized in that: The vertical support plate comprises a left vertical support plate (11) and a right vertical support plate (12), both of which have the same structure and are symmetrically arranged. The left vertical support plate (11) and the right vertical support plate (12) are welded together. A protrusion is provided in the middle of one side opposite to the connection point on the left vertical support plate (11) and the right vertical support plate (12), and the steel pipe is welded to the protrusion.

3. The I-beam supported marine composite sandwich panel connection mechanism according to claim 2, characterized in that: Reinforced brackets (16) are provided on both sides of the connection between the left vertical support plate (11) and the right vertical support plate (12), and a connecting structure panel (15) is welded above the left vertical support plate (11) and the right vertical support plate (12).

4. The I-beam supported marine composite sandwich panel connection mechanism according to claim 2, characterized in that: The steel pipe is an inclined D-shaped steel pipe, comprising a left inclined D-shaped steel pipe (13) and a right inclined D-shaped steel pipe (14), both of which have the same structure. The left inclined D-shaped steel pipe (13) is welded to the left vertical support plate (11), and the right inclined D-shaped steel pipe (14) is welded to the right vertical support plate (12).

5. The I-beam supported marine composite sandwich panel connection mechanism according to claim 4, characterized in that: The left inclined D-shaped steel pipe (13) comprises an upper horizontal surface (131), a vertical surface (133), a lower horizontal surface (132) and an inclined side surface (134), and the surfaces are connected by arc surfaces in turn. The thickness of the vertical surface (133) and the arc surface at the connection between the vertical surface (133) and the upper horizontal surface (131) and the lower horizontal surface (132) is greater than the thickness of the other surfaces. The protrusion of the left vertical support plate (11) is welded on the vertical surface (133).

6. The I-beam supported marine composite sandwich panel connection mechanism according to claim 5, characterized in that: The composite sandwich panel structure (2) comprises an upper skin (21), a lower skin (22) and a plurality of core materials (23); the core materials (23) are in the shape of a trapezoidal hollow tube; the core materials (23) are bonded to each other; the oblique side surface (134) of the left oblique D-shaped steel tube (13) is bonded to the adjacent core materials (23); the upper skin (21) and the lower skin (22) respectively cover the core materials (23) and the upper and lower sides of the left oblique D-shaped steel tube (13) and the vertical surface (133) of the left oblique D-shaped steel tube (13); and a notch corresponding to the protrusion is left on the vertical surface (133).

7. The I-beam supported marine composite sandwich panel connection mechanism according to claim 6, characterized in that: The upper surface of the connection structure panel (15) of the steel connection mechanism (1) is flush with the upper surface of the upper skin (21).

8. The I-beam supported marine composite sandwich panel connection mechanism according to claim 6, characterized in that: The I-beam (3) comprises an I-beam upper panel (31), an I-beam lower panel (33) and an I-beam web (32), symmetrically arranged lateral reinforcing brackets (34) are provided on both sides of the I-beam web (32), the I-beam upper panel (31) is welded to a vertical support plate of a steel connection structure (1), and the width of the I-beam upper panel (31) is greater than the width of the steel connection structure (1).

9. The I-beam supported marine composite sandwich panel connection mechanism according to claim 8, characterized in that: The reinforcing bracket (16) and the I-beam web (32) are located in the same plane.

10. The I-beam supported marine composite sandwich panel connection mechanism according to claim 8, characterized in that: An upper ceramic wool (41) is arranged above the upper skin (21) of the composite sandwich panel structure (2), and a lower ceramic wool (42) is arranged below the lower skin (22). An upper thin steel plate (51) is arranged outside the upper ceramic wool (41), and a lower thin steel plate (52) is arranged outside the lower ceramic wool (42). The upper thin steel plate (51) is connected to the connecting structure panel (15) by bolts (17), and the lower thin steel plate (52) is welded to the upper panel (31) of the I-beam.

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