Sandwich composite bridge deck
Patent Information
- Application Number
- CN202521666081.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-06
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-08-06
AI Technical Summary
[0004]有鉴于此，本实用新型的目的在于提出一种夹芯式复合材料桥面板，以解决现有桥面板复合结构整体强度不高的问题
1.该种夹芯式复合材料桥面板，通过在多个夹芯面板之间依次并排连接形成整体结构，各夹芯面板由多腔体空芯板与嵌入式合成板本体构成，合成板本体包括由拉挤格栅或模塑格栅与闭孔聚氨酯发泡材料复合形成的结构，格栅内部纵横交错布置纤维增强材料，纤维增强材料为纤维纱、纤维毡或者两者的混合物；纤维纱包括玻璃纤维纱、碳纤维纱、芳纶纤维纱中的一种或多种的混合物，纤维毡包括玻璃纤维毡、玻璃纤维网格布、碳纤维毡、碳纤维布、芳纶毡、芳纶布中的一种或多种的混合物，从而在夹芯面板中形成多方向增强的力学支撑，上层的平板通过环氧树脂黏合剂与夹芯面板粘接固定，并设置有与空芯板方向垂直的纤维增强材料，进一步形成结构力学上的双向增强体系，整体构成一种具有优良承载性能的夹芯式桥面板结构；通过将拉挤格栅合成板或模塑格栅合成板与空芯板一体复合，并使平板与夹芯面板中的空芯板之间设置纤维增强材料方向垂直的结构关系，有效提升了桥面板在纵、横两个方向上的力学性能，实现多方向载荷的均衡分布；采用闭孔聚氨酯发泡材料作为芯材填充，具有良好的轻质、高强和耐久性能；整体结构采用拉挤工艺工厂化成型、现场快速拼装，显著缩短施工周期，减轻桥梁自重，适用于恶劣环境下的长期使用，具备优异的耐腐蚀性和维护经济性。
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Figure CN224716947U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of composite bridge deck technology, specifically a sandwich composite bridge deck. Background Technology
[0002] Traditional bridge decks are mostly made of reinforced concrete. Construction typically involves continuous on-site concrete pouring. Due to the curing characteristics of concrete, the construction period is long, labor-intensive, and causes significant inconvenience to traffic. Furthermore, it lacks emergency response capabilities. After a period of use, concrete bridge decks are prone to cracking, and exposed reinforcing steel is susceptible to corrosion. Therefore, frequent inspection, maintenance, and repair of concrete bridge decks are essential.
[0003] In recent years, research institutions have been conducting extensive experimental studies on how to improve the strength of composite bridge decks to meet the requirement of high load-bearing capacity. A multi-cavity composite bridge deck manufactured using the pultrusion process has been successfully designed. However, due to the unidirectional fiber orientation in the pultrusion process, the longitudinal tensile strength of the composite bridge deck is much greater than its transverse tensile strength. Therefore, research institutions have incorporated a core material into the cavities of the composite bridge deck, integrally molding the core material with the multi-cavity composite bridge deck. Fiber-reinforced composite bridge decks prepared using the pultrusion process can achieve continuous industrial production and exhibit excellent longitudinal tensile strength. However, while some existing sandwich bridge decks attempt to improve mechanical properties by filling the cavities with long-fiber foamed core materials, problems such as insufficient bonding between the foamed material and the long-fiber reinforcement, poor fiber impregnation, low fiber content, and delamination within the core material are still prevalent, resulting in low overall strength of the composite structure and limiting its widespread application in bridge engineering. Therefore, this invention proposes a sandwich composite bridge deck to meet the needs of improving the balanced distribution of multi-directional loads and reducing the bridge's self-weight. Summary of the Invention
[0004] In view of this, the purpose of this utility model is to propose a sandwich composite bridge deck to solve the problem of low overall strength of existing bridge deck composite structures.
[0005] To achieve the above objectives, this utility model provides a sandwich composite bridge deck, comprising a flat plate and a plurality of sandwich panels connected in parallel in sequence. The sandwich panels include pultruded grid sandwich panels and molded grid sandwich panels. The upper surfaces of the flat plate and the sandwich panels are bonded together by epoxy resin adhesive. Fiber-reinforced materials are disposed inside the flat plate and the sandwich panels.
[0006] Preferably, the sandwich panel is composed of a hollow core board and a composite board body. The hollow core board has a multi-cavity structure. One end of the hollow core board is provided with a boss, and the other end of the hollow core board is provided with a tongue and groove. The boss and the tongue and groove cooperate with each other for connection between sandwich panels.
[0007] Preferably, the composite plate body includes a pultruded grid composite plate and a molded grid composite plate, which are respectively formed by pultruded grid or molded grid and closed-cell polyurethane foam material injected into the open space area of pultruded grid or molded grid.
[0008] Preferably, the pultruded grid is composed of a number of sequentially arranged I-beams and fixing pins arranged perpendicularly to the I-beams. The I-beams include an upper flange, a lower flange, and a web connecting the two. The web is provided with a locking hole for the fixing pin to be inserted.
[0009] Preferably, the fixing pin includes a retaining pin and a middle pin. The retaining pin includes an upper retaining pin and a lower retaining pin. The upper retaining pin and the lower retaining pin are provided with retaining grooves. The middle pin is provided with guide grooves on both sides, which are respectively embedded between the upper retaining pin and the lower retaining pin, so that the retaining grooves of the upper retaining pin and the lower retaining pin are tightly embedded in the retaining holes of the web of the I-beam, thereby fixing the upper retaining pin and the lower retaining pin. The spacing between the retaining grooves of the upper retaining pin and the lower retaining pin and the I-beam is matched with the web thickness.
[0010] Preferably, the gap between the fixing pin and the locking hole of the web of the I-beam is filled with epoxy resin adhesive and cured, so that the I-beam is vertically fixed to the fixing pin.
[0011] Preferably, the molded grid is composed of vertically intersecting longitudinal and transverse vertical plates. The cross-sections of the longitudinal and transverse vertical plates are isosceles trapezoids, and the cross-sections of the surrounding longitudinal and transverse vertical plates are right-angled trapezoids. The right-angled sides of the surrounding longitudinal vertical plates are attached to the inner side plate of the cavity of the hollow core plate. The interior of both the longitudinal and transverse vertical plates is provided with continuously interwoven continuous fiber reinforcement material.
[0012] Preferably, at the bridge deck installation site, multiple pultruded grating sandwich panels or molded grating sandwich panels are connected side by side by applying epoxy resin adhesive to the bosses and tongue-and-groove parts of the hollow core plate. After the connection, the upper surface of the sandwich panel and the lower surface of the flat plate are respectively glued to bond the flat plate. The laying direction of the fiber reinforcement material in the flat plate is perpendicular to the direction of the fiber reinforcement material in the hollow core plate of the sandwich panel, so as to enhance the bridge deck's ability to withstand multi-directional loads.
[0013] The beneficial effects of this utility model are: 1. This type of sandwich composite bridge deck is formed by sequentially connecting multiple sandwich panels side by side to form an integral structure. Each sandwich panel consists of a multi-cavity hollow core plate and an embedded composite plate body. The composite plate body includes a structure formed by combining pultruded or molded grids with closed-cell polyurethane foam material. Fiber reinforcing materials are arranged crisscrossingly inside the grids. The fiber reinforcing materials are fiber yarn, fiber felt, or a mixture of both. The fiber yarn includes one or more mixtures of glass fiber yarn, carbon fiber yarn, and aramid fiber yarn. The fiber felt includes one or more mixtures of glass fiber felt, glass fiber mesh, carbon fiber felt, carbon fiber cloth, aramid felt, and aramid cloth, thereby forming multi-directional reinforcing mechanical support in the sandwich panel. The upper plate is bonded and fixed to the sandwich panel with epoxy resin adhesive. The structure incorporates fiber reinforcement materials perpendicular to the direction of the hollow core panel, further forming a two-way reinforcement system in terms of structural mechanics. This results in a sandwich bridge deck structure with excellent load-bearing capacity. By integrally combining pultruded or molded grating composite panels with the hollow core panel, and establishing a structural relationship where the fiber reinforcement materials are perpendicular to the direction of the hollow core panel, the mechanical properties of the bridge deck in both longitudinal and transverse directions are effectively improved, achieving a balanced distribution of multi-directional loads. Closed-cell polyurethane foam is used as the core material, exhibiting excellent lightweight, high strength, and durability. The overall structure is manufactured in a pultrusion process, allowing for rapid on-site assembly, significantly shortening the construction period, reducing the bridge's self-weight, and making it suitable for long-term use in harsh environments. It also possesses excellent corrosion resistance and economical maintenance.
[0014] 2. In this type of sandwich composite bridge deck, the two ends of the fixing pins are flush with the outer ends of the I-beam flanges on both sides of the pultruded grid. During the curing process of the epoxy resin adhesive, the overflowing epoxy resin adhesive fills the gap between the clip holes of the I-beam web and the fixing pin, forming a pultruded grid with the I-beam perpendicular to the fixing pin. Moreover, the direction of the fiber reinforcement material inside the I-beam is perpendicular to the direction of the fiber reinforcement material inside the fixing pin, so that the longitudinal and transverse mechanical properties of the pultruded grid are balanced.
[0015] 3. In this type of sandwich composite bridge deck, after the epoxy resin adhesive has cured, the pultruded grating is placed in the mold cavity of the foaming material. A closed-cell polyurethane foam containing chopped fiber yarns is injected into the mold cavity using an injection molding machine. After the polyurethane foam has completely foamed and cured, it fills the open areas of the pultruded grating. Excess polyurethane foam is removed from the outer surface of the pultruded grating, forming a pultruded grating composite board. The pultruded grating composite board matches the cavity of the hollow core board, and the pultruded grating composite board and the hollow core board are integrally composited using the pultrusion process, allowing the pultruded grating composite board to be embedded in the cavity of the hollow core board, forming a pultruded grating sandwich panel. Simultaneously, the fiber reinforcement materials in the I-beams and fixing pins are arranged perpendicularly to each other, enhancing the longitudinal and transverse stress performance of the pultruded grating and providing a more balanced mechanical support foundation for the sandwich panel, thus helping to improve the overall bending, shear, and impact resistance of the bridge deck.
[0016] 4. This type of sandwich composite bridge deck involves placing a molded grid in a mold cavity of foamed material. A closed-cell polyurethane foam containing chopped fiber yarn is injected into the mold cavity using an injection molding machine. After the polyurethane foam has completely foamed and cured, it fills the gaps in the molded grid. Excess polyurethane foam is removed from the outer surface of the molded grid, forming a molded grid composite panel. This composite panel matches the hollow core panel cavity, and the molded grid composite panel and the hollow core panel are integrally composited using a pultrusion process, ensuring the molded grid is fully bonded. The molded grating is embedded in the cavity of the hollow core board to form a molded grating sandwich panel. By weaving continuous fiber yarns vertically and interlaced inside the longitudinal and transverse vertical plates, the grating has high-strength reinforcement support in both main directions, which significantly improves the compressive strength, shear strength and overall stiffness of the molded grating composite panel. The grating structure is regular and mechanically symmetrical. Combined with the structural shape design of isosceles trapezoids and right trapezoids, it can effectively distribute the multi-directional loads applied to the bridge deck, and enhance the stability and reliability of the entire sandwich panel structure under complex stress conditions. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a three-dimensional structural diagram of the pultruded grating bridge panel of this utility model; Figure 2 This is a three-dimensional structural diagram of the hollow core plate of this utility model; Figure 3This is a three-dimensional structural diagram of the I-beam and fixing pin of this utility model. Figure 4 This is a three-dimensional structural diagram of the fixing pin of this utility model; Figure 5 This is a three-dimensional structural diagram of the molded grating bridge panel of this utility model; Figure 6 This is an exploded three-dimensional structural diagram of the molded grating bridge deck of this utility model; Figure 7 This utility model Figure 6 Enlarged 3D structural diagram at point A.
[0019] The following are labeled in the diagram: 1. Flat plate; 2. Hollow core plate; 3. Boss; 4. Tongue and groove; 5. Composite board body; 6. Pultruded grating sandwich panel; 7. Molded grating sandwich panel; 8. Upper flange; 9. Web plate; 10. Lower flange; 11. Clip hole; 12. Upper clip; 13. Lower clip; 14. Middle pin; 15. Guide groove; 16. Slot; 17. Longitudinal vertical plate; 18. Transverse vertical plate; 19. Fiber reinforced material; 20. Foamed material. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.
[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0022] In one typical implementation of this application, such as Figures 1-7As shown, a sandwich composite bridge deck includes a flat plate 1 and multiple sandwich panels connected side by side in sequence. The sandwich panels include pultruded grating sandwich panels 6 and molded grating sandwich panels 7. The flat plate 1 and the upper surface of the sandwich panels are bonded together by epoxy resin adhesive. Fiber reinforcing material 19 is disposed inside the flat plate 1 and the sandwich panels. The sandwich panels are composed of hollow core plates 2 and composite plate bodies 5. The hollow core plates 2 have a multi-cavity structure. One end of the hollow core plate 2 is provided with a boss 3, and the other end of the hollow core plate 2 is provided with a tongue and groove 4. The boss 3 and the tongue and groove 4 cooperate with each other for connection between the sandwich panels. The composite plate body 5 includes pultruded grating composite plates and molded grating composite plates, which are respectively formed by pultruded grating or molded grating and closed-cell polyurethane foam material 20 injected into the open space area of pultruded grating or molded grating. An integral structure is formed by sequentially connecting multiple sandwich panels side by side. Each sandwich panel consists of a multi-cavity hollow core panel 2 and an embedded composite panel body 5. The composite panel body 5 includes a structure formed by combining pultruded or molded grids with closed-cell polyurethane foam material 20. Fiber reinforcing material 19 is arranged crisscrossingly inside the grid. The fiber reinforcing material 19 is fiber yarn, fiber mat, or a mixture of both. The fiber yarn includes one or more mixtures of glass fiber yarn, carbon fiber yarn, and aramid fiber yarn. The fiber mat includes one or more mixtures of glass fiber mat, glass fiber mesh, carbon fiber mat, carbon fiber cloth, aramid mat, and aramid cloth, thereby forming a multi-directional mechanical reinforcement in the sandwich panel. The upper plate 1 is bonded and fixed to the sandwich panel with epoxy resin adhesive, and is provided with fiber reinforcement material 19 perpendicular to the direction of the hollow core plate 2, further forming a two-way reinforcement system in terms of structural mechanics. The whole structure constitutes a sandwich bridge deck structure with excellent load-bearing performance. By integrally compositing the pultruded grid composite plate or the molded grid composite plate with the hollow core plate 2, and setting the structural relationship between the plate 1 and the hollow core plate 2 in the sandwich panel with the fiber reinforcement material 19 perpendicular to the direction, the mechanical properties of the bridge deck in both longitudinal and transverse directions are effectively improved, and the balanced distribution of multi-directional loads is achieved. Closed-cell polyurethane foam material 20 is used as the core material filling, which has good lightweight, high strength and durability properties. Furthermore, at the bridge deck installation site, multiple pultruded grating sandwich panels 6 or molded grating sandwich panels 7 are connected side-by-side by applying epoxy resin adhesive to the bosses 3 and tongue-and-groove joints 4 on the hollow core plate 2. The upper surface of the connected sandwich panels and the lower surface of the flat plate 1 are then glued together. The fiber reinforcement material 19 in the flat plate 1 is laid perpendicular to the direction of the fiber reinforcement material 19 within the hollow core plate 2 of the sandwich panel, thereby enhancing the bridge deck's ability to withstand multi-directional loads. The overall structure is manufactured in a factory using a pultrusion process and rapidly assembled on-site, significantly shortening the construction period, reducing the bridge's self-weight, and making it suitable for long-term use in harsh environments. It also possesses excellent corrosion resistance and economical maintenance.
[0023] As a preferred embodiment of this example, please refer to the appendix. Figures 1-4 The pultruded grating consists of several sequentially arranged I-beams and fixing pins perpendicular to the I-beams. Each I-beam includes an upper flange 8, a lower flange 10, and a web 9 connecting the two. The web 9 has locking holes 11 for the fixing pins to be inserted. The fixing pins include locking pins and middle pins 14. The locking pins include an upper locking pin 12 and a lower locking pin 13. The upper locking pin 12 and the lower locking pin 13 have locking grooves 16. The middle pin 14 has guide grooves 15 on both sides, which are respectively embedded in the upper locking pin 12 and the lower locking pin 13. Between the lower locking pins 13, the slots 16 of the upper locking pin 12 and the lower locking pin 13 are tightly embedded in the locking holes 11 of the web plate 9 of the I-beam, thereby fixing the upper locking pins 12 and the lower locking pins 13. The spacing between the slots 16 of the upper locking pins 12 and the lower locking pins 13 and the I-beam is matched with the thickness of the web plate 9. The gap between the fixing pin and the locking hole 11 of the web plate 9 of the I-beam is filled with epoxy resin adhesive and cured, so that the I-beam is perpendicularly fixed to the fixing pin. Pultruded gratings are factory-assembled products. During installation, a large amount of epoxy resin adhesive is applied to the locking holes 11 of the H-beam web 9, the guide groove 15 of the middle pin 14 in the fixing pin, and the locking grooves 16 of the upper locking pin 12 and lower locking pin 13. The H-beams are arranged sequentially, and the upper locking pin 12 and lower locking pin 13 pass through the locking holes 11 of the H-beam web 9. The locking grooves 16 of the upper locking pin 12 and lower locking pin 13 are respectively inserted into the locking holes 11 of the H-beam web 9. Then, the upper and lower guide grooves 15 at one end of the middle pin 14 are respectively inserted into the bottom plane of the upper locking pin 12 and the upper plane of the lower locking pin 13. At one end, the other end of the middle pin 14 is pushed forward, causing the middle pin 14 to advance along the bottom plane of the upper locking pin 12 and the upper plane of the lower locking pin 13 until the other end of the middle pin 14 is flush with one end of the upper locking pin 12 and the lower locking pin 13, and the guide groove 15 of the middle pin 14 is completely embedded between the upper locking pin 12 and the lower locking pin 13, and the two ends of the fixing pin are flush with the outer ends of the I-beam flanges on both sides of the pultruded grating. During the curing process of the epoxy resin adhesive, the overflowing epoxy resin adhesive fills the gap between the locking hole 11 of the web plate 9 of the I-beam and the fixing pin, forming a connection between the I-beam and the fixing pin. The vertical pultruded grating, with the fiber reinforcement material 19 inside the I-beam perpendicular to the direction of the fiber reinforcement material 19 inside the fixing pin, ensures balanced longitudinal and transverse mechanical properties of the pultruded grating. After the epoxy resin adhesive cures, the pultruded grating is placed in the mold cavity of the foam material 20. Closed-cell polyurethane foam material 20 containing chopped fiber yarns is injected into the mold cavity of the foam material 20 using an injection molding machine. After the polyurethane foam material 20 is completely foamed and cured, it fills the open areas of the pultruded grating, except for the outer surface of the pultruded grating. The remaining polyurethane foam material 20 forms a pultruded grating composite panel. The pultruded grating composite panel matches the cavity of the hollow core plate 2, and the pultruded grating composite panel and the hollow core plate 2 are integrally composited by the pultrusion process, so that the pultruded grating composite panel is embedded in the cavity of the hollow core plate 2 to form a pultruded grating sandwich panel 6. At the same time, the fiber reinforcement material 19 in the I-beams and fixing pins is arranged perpendicularly to each other, which enhances the longitudinal and transverse stress performance of the pultruded grating, provides a more balanced mechanical support foundation for the sandwich panel, and helps to improve the overall bending, shear and impact resistance of the bridge deck.
[0024] As a preferred embodiment of this example, please refer to the appendix. Figures 5-7 The molded grid is composed of vertically intersecting longitudinal vertical plates 17 and transverse vertical plates 18. The cross-sections of the longitudinal vertical plates 17 and transverse vertical plates 18 are isosceles trapezoids, and the cross-sections of the surrounding longitudinal vertical plates 17 and transverse vertical plates 18 are right-angled trapezoids. The right-angled sides of the surrounding longitudinal vertical plates 17 are attached to the inner side plate of the cavity of the hollow core plate 2. The interior of both the longitudinal vertical plates 17 and transverse vertical plates 18 is provided with continuous interwoven continuous fiber reinforcement material 19. The molded grid is placed in the mold cavity of the foam material 20. A closed-cell polyurethane foam material 20 containing chopped fiber yarn is injected into the mold cavity using an injection molding machine. After the polyurethane foam material 20 has completely foamed and cured, it fills the gaps in the molded grid. Excess polyurethane foam material 20 is removed from the outer surface of the molded grid, forming a molded grid composite board. The molded grid composite board matches the cavity of the hollow core board 2, and the molded grid composite board and the hollow core board 2 are integrally composited using a pultrusion process, making the molded grid composite board... The molded grating sandwich panel 7 is formed by embedding it into the cavity of the hollow core plate 2. By interlacing continuous fiber yarns inside the longitudinal vertical plate 17 and the transverse vertical plate 18, the grating has high-strength reinforcement support in both main directions, which significantly improves the compressive strength, shear strength and overall stiffness of the molded grating composite panel. The grating structure is regular and mechanically symmetrical. Combined with the structural shape design of isosceles trapezoids and right trapezoids, it can effectively distribute the multi-directional loads applied to the bridge deck, and enhance the stability and reliability of the entire sandwich panel structure under complex stress conditions.
[0025] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.
[0026] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A sandwich-type composite material bridge deck, characterized in that: The system includes a flat plate (1) and multiple sandwich panels connected side by side in sequence. The sandwich panels include pultruded grating sandwich panels (6) and molded grating sandwich panels (7). The flat plate (1) and the upper surface of the sandwich panels are bonded together by epoxy resin adhesive. Fiber-reinforced material (19) is provided inside the flat plate (1) and the sandwich panels. The sandwich panels are composed of a hollow core plate (2) and a composite board body (5). The hollow core plate (2) has a multi-cavity structure. One end of the hollow core plate (2) is provided with a boss (3), and the other end of the hollow core plate (2) is provided with a tongue and groove (4). The boss (3) and the tongue and groove (4) cooperate with each other for connection between the sandwich panels. The composite board body (5) includes a pultruded grating composite board and a molded grating composite board, which are respectively formed by pultruded grating or molded grating and closed-cell polyurethane foam material (20) injected into the open space of the pultruded grating or molded grating. At the bridge deck installation site, multiple pultruded grating sandwich panels (6) or molded grating sandwich panels (7) are connected side by side by applying epoxy resin adhesive to the boss (3) on the hollow core plate (2) and the tongue and groove (4) part. After the connection, the upper surface of the sandwich panel and the lower surface of the flat plate are respectively coated with adhesive to bond the flat plate (1). The laying direction of the fiber reinforcement material (19) in the flat plate (1) is perpendicular to the direction of the fiber reinforcement material (19) in the hollow core plate (2) of the sandwich panel.
2. The sandwich composite bridge deck according to claim 1, characterized in that: The pultruded grid consists of several I-beams arranged in sequence and fixing pins arranged perpendicularly to the I-beams. The I-beams include an upper flange (8), a lower flange (10), and a web (9) connecting the two. The web (9) is provided with a locking hole (11) for the fixing pin to be inserted.
3. A sandwich composite bridge deck according to claim 2, characterized in that: The fixing pin includes a locking pin and a middle pin (14). The locking pin includes an upper locking pin (12) and a lower locking pin (13). The upper locking pin (12) and the lower locking pin (13) are provided with locking grooves (16). The middle pin (14) is provided with guide grooves (15) on both sides, which are respectively embedded between the upper locking pin (12) and the lower locking pin (13), so that the locking grooves (16) of the upper locking pin (12) and the locking grooves (16) of the lower locking pin (13) are tightly embedded in the locking holes (11) of the web plate (9) of the I-beam, thereby fixing the upper locking pin (12) and the lower locking pin (13). The spacing between the locking grooves (16) of the upper locking pin (12) and the lower locking pin (13) and the I-beam is matched with the thickness of the web plate (9).
4. A sandwich composite bridge deck according to claim 3, characterized in that: The gap between the fixing pin and the locking hole (11) of the web plate (9) of the I-beam is filled with epoxy resin adhesive and cured so that the I-beam is vertically fixed to the fixing pin.
5. A sandwich composite bridge deck according to claim 4, characterized in that: The molded grid is composed of vertically intersecting longitudinal plates (17) and transverse plates (18). The cross-sections of the longitudinal plates (17) and the transverse plates (18) are isosceles trapezoids, and the cross-sections of the surrounding longitudinal plates (17) and transverse plates (18) are right trapezoids. The right-angled sides of the surrounding longitudinal plates (17) are attached to the inner side plate of the cavity of the hollow core plate (2). The interior of the longitudinal plates (17) and the transverse plates (18) is provided with continuous interwoven continuous fiber reinforcement material (19).