Box type composite beam bridge

Abstract

The utility model discloses a box-type composite girder bridge, which relates to the technical field of bridges, and particularly comprises a double-steel-plate bridge deck, a steel plate bridge deck and a steel plate bridge deck, a support body is arranged between the panel and the back plate and is used for connecting the panel and the back plate; a pouring hole is formed in the surface of the face plate and used for filling a cavity between the face plate and the back plate with concrete. The open end of the groove-shaped steel beam is relatively and fixedly connected with the back plate of the double-steel-plate bridge deck; according to the box-type composite girder bridge, the double-steel-plate bridge deck is adopted, the cavity for filling concrete is reserved inside, the box-type composite girder bridge has the advantages of a concrete bridge deck and a steel bridge deck, the span limitation of the girder bridge is reduced, the box-type composite girder bridge meets the economical efficiency of a larger span range, meanwhile, the groove-shaped steel beams and the double-steel-plate bridge deck are directly fixed, production can be conducted in a factory, and the production cost is reduced. The problem that the construction speed and quality of a construction site are difficult to guarantee is solved.

Description

Technical Field

[0001] This utility model relates to the field of bridge technology, and more specifically, to a box-girder composite beam bridge. Background Technology

[0002] Steel box girder bridges mainly come in several forms, such as single-box single-cell, double-box single-cell, multi-box single-cell, and single-box multi-cell. The bridge deck is mainly made of concrete or steel.

[0003] Currently, concrete bridge decks are often used for single-cell bridges. In this case, the bridge deck and the steel box girder form a steel box composite beam bridge. The structure makes full use of the compressive strength of concrete and the tensile strength of steel, avoiding the fatigue problem of steel bridge deck pavement. However, its structural self-weight is relatively large, which limits its application in extra-large span bridges.

[0004] Steel box girder bridges suffer from negative bending moments at the supports of continuous beams, leading to concrete cracking. This results in reduced stiffness and load-bearing capacity of the composite beam section, and corrosion of the internal steel reinforcement, impacting the structure's durability. For small to medium spans, controlling crack width to meet code requirements is generally economical and feasible, and also satisfies durability requirements. For larger spans, additional measures such as preloading, applying prestress, and adjusting support elevations are necessary, which limits the application range of this type of bridge.

[0005] For single-box multi-cell structures, steel bridge decks are generally used. When using steel bridge decks, the structure's self-weight is relatively light, and its stability under crosswinds is good. However, the internal stress state of the structure is complex, making internal inspection and maintenance of the box girder more difficult and the maintenance cost relatively high. The fatigue problem of steel bridge decks still needs further research and improvement.

[0006] The aforementioned characteristics determine the economic span of the two bridge deck types. Generally, reinforced concrete bridge decks are more economical for spans less than 60m, while steel bridge decks are more economical for spans greater than 80m. Both types have limitations in span and economic constraints. Furthermore, when using concrete bridge decks, the box girder and bridge deck are often separated, requiring on-site assembly, which slows down construction progress and makes it difficult to guarantee quality.

[0007] In summary, how to solve the problems of existing beam bridges with large span limitations, slow on-site construction progress, and difficulty in guaranteeing quality is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0008] In view of this, the purpose of this utility model is to provide a box-type composite beam bridge with a double steel plate bridge deck and an internal cavity reserved for filling concrete, thereby combining the advantages of concrete bridge deck and steel bridge deck, reducing the span limitation of the beam bridge, making it economical for a wider range of spans. At the same time, the use of channel steel beams directly fixed to the double steel plate bridge deck allows for factory production, solving the problem of difficulty in ensuring construction speed and quality on the construction site.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A box-girder composite bridge, comprising:

[0011] A double steel plate bridge deck includes a front panel and a back panel; a support is provided between the front panel and the back panel for connecting the front panel and the back panel; the surface of the front panel is provided with casting holes for filling concrete into the cavity between the front panel and the back panel;

[0012] The channel-shaped steel beam has its open end fixedly connected to the back plate of the double steel plate bridge deck.

[0013] Preferably, the front panel and the back panel are arranged in parallel, and the support body is a number of parallel bridge deck webs, with the two sides of the bridge deck webs respectively fixedly connected to the front panel and the back panel.

[0014] Preferably, the panel and the back plate are arranged in parallel, and the support is a steel truss, with both ends of the steel truss being fixedly connected to the panel and the back plate respectively.

[0015] Preferably, the double steel plate bridge deck includes several sets of H-beams arranged in sequence, the two side wall edges of the H-beams are welded in sequence to form the front panel and the back panel, and the middle wall of the H-beams forms the support body;

[0016] Alternatively, the double steel plate bridge deck may include several sets of Z-shaped steel arranged in sequence, with the two side wall edges of the Z-shaped steel being welded in sequence to form the front panel and the back panel, and the middle wall of the Z-shaped steel forming the support body;

[0017] Alternatively, the double steel plate bridge deck may include several sets of U-shaped steels arranged in sequence, with the open end of the U-shaped steel being welded sequentially to the outer wall of the middle wall of the U-shaped steel to close the opening of the U-shaped steel. The two side walls of the U-shaped steel respectively form the front panel and the back panel, and the middle wall of the U-shaped steel forms the support body.

[0018] Alternatively, the double steel plate bridge deck may include several sets of rectangular tubes arranged in sequence, with the sidewalls of the rectangular tubes welded in sequence. The upper and lower walls of the rectangular tubes respectively form the front panel and the back panel, and the sidewalls of the rectangular tubes form the support body.

[0019] Preferably, the panel or the back plate is a wide steel plate;

[0020] Several sets of T-shaped steel are welded to the surface of the wide steel plate. The vertical wall ends of the T-shaped steel are welded perpendicularly to the wide steel plate. The horizontal walls of the T-shaped steel are welded and fixed on both sides in sequence. All the horizontal walls of the T-shaped steel together form a plane.

[0021] Alternatively, several sets of channel steels may be welded to the surface of the wide steel plate, with the open ends of the channel steels welded to the wide steel plate, and the side walls of two adjacent sets of channel steels welded and fixed, or a narrow steel plate may be welded and fixed between two adjacent sets of channel steels, with the narrow steel plate and the middle wall of the channel steel forming a plane.

[0022] Preferably, the channel-shaped steel beam includes a steel beam base plate and steel beam web plates welded to both sides of the steel beam base plate. The other side of the steel beam web plate is fixedly connected to the outer surface of the back plate, and the included angle α between the steel beam web plate and the steel beam base plate is a right angle or an obtuse angle.

[0023] Preferably, a support plate is fixedly connected to the side of the web of the steel beam away from the bottom plate of the steel beam, and the support plate is in contact with and fixedly connected to the back plate.

[0024] Preferably, several sets of channel steel beams are fixedly arranged below the back plate, and a transverse connecting body is provided between adjacent channel steel beams, or two adjacent sets of channel steel beams are welded and fixed together.

[0025] Preferably, the casting hole is located at the longitudinal end of the double steel plate bridge deck, and the end of the support body is within the orthographic projection area of ​​the casting hole.

[0026] Preferably, when two adjacent sets of double steel plate bridge decks are longitudinally spliced, the corresponding positions of all the back plates and the ends of the support bodies are connected by friction type high-strength bolts.

[0027] When two adjacent sets of the channel steel beams are longitudinally spliced, the corresponding positions at the ends of the channel steel beams are connected by friction-type high-strength bolts.

[0028] The box-girder composite girder bridge provided by this utility model has at least the following advantages compared with the prior art:

[0029] The double steel plate bridge deck uses a cavity formed by combining the front and back plates, with pre-reserved casting holes for pouring concrete into the cavity. This allows the double steel plate bridge deck to combine the advantages of both concrete and steel plate bridge decks, thus achieving a wider range of economical spans. At the same time, its weight is less than that of concrete bridge decks, which helps to reduce the metal fatigue problem of steel bridge decks.

[0030] Meanwhile, the double steel plate bridge deck and channel steel beam can be directly produced in the factory and transported to the site as whole components for assembly. Compared with production on the construction site, both production efficiency and quality can be guaranteed. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 A schematic diagram of the transverse section of a specific box-girder composite beam bridge provided by this utility model;

[0033] Figure 2 This is a schematic diagram of the transverse section of a second embodiment of the box-type composite beam bridge provided by this utility model;

[0034] Figure 3 This is a schematic diagram of the steel truss structure inside the double steel plate bridge deck provided by this utility model;

[0035] Figure 4 for Figure 3 Sectional view at point AA;

[0036] Figure 5 A schematic diagram of the transverse cross-section of the specific channel steel beam provided by this utility model;

[0037] Figure 6 This is a schematic diagram of the transverse section of the third embodiment of the box-type composite beam bridge provided by this utility model;

[0038] Figure 7 This is a schematic diagram of the longitudinal connection of the channel steel beam provided by this utility model;

[0039] Figure 8 This is a schematic diagram of the longitudinal connection of the double steel plate bridge deck provided by this utility model;

[0040] Figure 9 for Figure 8 Sectional view at point BB;

[0041] Figure 10 A schematic cross-sectional view of a second embodiment of the double steel plate bridge deck provided by this utility model;

[0042] Figure 11 A schematic cross-sectional view of the third embodiment of the double steel plate bridge deck provided by this utility model;

[0043] Figures 12-15An exploded view of the components of the double steel plate bridge deck provided by this utility model;

[0044] Figure 16 This is a structural schematic diagram of the box-girder composite beam bridge provided by this utility model;

[0045] Figure 17 This utility model provides structural schematic diagrams of several sets of box-type composite beam bridges before splicing;

[0046] Figure 18 This is a schematic diagram of the structure of several sets of box-type composite beam bridges after splicing, provided by this utility model.

[0047] In the picture:

[0048] 1. Double steel plate bridge deck; 11. Facing plate; 12. Back plate; 13. Support structure; 14. Casting hole;

[0049] 2. Channel steel beam; 21. Steel beam web; 22. Steel beam bottom plate; 23. Support plate;

[0050] 3. Connector. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] The core of this utility model is to provide a box-type composite beam bridge with a double steel plate bridge deck and an internal cavity reserved for filling concrete, thus combining the advantages of both concrete and steel bridge decks. This reduces the span limitations of the beam bridge, making it economical for a wider range of spans. At the same time, the use of channel steel beams directly fixed to the double steel plate bridge deck allows for factory production, solving the problem of difficulty in ensuring construction speed and quality on-site.

[0053] Please refer to Figures 1-16 A box-girder composite bridge, comprising:

[0054] The double steel plate bridge deck 1 includes a front panel 11 and a back panel 12; a support 13 is provided between the front panel 11 and the back panel 12 for connecting the front panel 11 and the back panel 12; a pouring hole 14 is provided on the surface of the front panel 11 for filling concrete into the cavity between the front panel 11 and the back panel 12.

[0055] The channel-shaped steel beam 2 has its open end fixedly connected to the back plate 12 of the double steel plate bridge deck 1.

[0056] like Figure 1 and Figure 16 As shown, the double steel plate bridge deck 1 uses two layers of steel plates as the face plate 11 and the back plate 12 respectively, and a support body 13 is set between the two layers of steel plates to connect and fix the two layers of steel plates to form a whole. A pouring hole 14 is set on the face plate 11. After the box girder bridge is transported to the construction site and assembled, concrete is poured into the cavity between the face plate 11 and the back plate 12 through the pouring hole 14, so that the concrete is effectively combined with the double steel plates. Thus, the double steel plate bridge deck 1 has the advantages of both steel plate bridge decks and concrete bridge decks, such as light weight, resistance to crosswinds, and no need for single box multi-chamber box girder for support, which facilitates its overall maintenance and can achieve a wider range of economic span applicability.

[0057] Simultaneously, channel steel beams 2 support the double steel plate bridge deck 1. Both can be assembled in the factory using automated equipment, such as automated welding machines, to weld the connection points. After welding, the channel steel beams 2 and double steel plate bridge deck 1 are transported as a whole. At the construction site, only different box-type composite beam bridges need to be spliced ​​together to obtain the desired result. Figure 17 and Figure 18 The entire bridge shown will then be completed by pouring concrete.

[0058] In some embodiments, the panel 11 and the back plate 12 are arranged in parallel, and the support body 13 is a number of parallel bridge deck webs, with the two sides of the bridge deck webs respectively fixedly connected to the panel 11 and the back plate 12.

[0059] like Figure 1 and Figure 2 As shown, several sets of parallel bridge deck webs are arranged between the panel 11 and the back plate 12, dividing the cavity between the panel 11 and the back plate 12 into several sets of independent small cavities, and ensuring that the pouring hole 14 is connected to all the small cavities, thereby ensuring that the small cavities can be filled with concrete. During the process, the bridge deck web can be used as steel reinforcement in the concrete to increase the overall rigidity and compressive strength of the bridge deck.

[0060] Meanwhile, the bridge deck web is arranged vertically, and the welds between it and the front panel 11 and the back panel 12 are all straight, which facilitates automated welding using welding machines, effectively improving production efficiency and ensuring production quality.

[0061] In some embodiments, the panel 11 and the back plate 12 are arranged in parallel, and the support 13 is a steel truss, with the two ends of the steel truss being fixedly connected to the panel 11 and the back plate 12 respectively.

[0062] like Figure 3 and Figure 4As shown, a steel truss is used as a support 13 between the panel 11 and the back plate 12 to connect and fix the panel 11 and the back plate 12. The connection position between the steel truss and the panel 11 and the back plate 12 is a weld point, which has low welding stress and will not cause division of the cavity between the panel 11 and the back plate 12. This helps to ensure the integrity of the concrete between the panel 11 and the back plate 12. At the same time, the steel truss has a smaller mass than the bridge deck web, which can further reduce the self-weight of the double steel plate bridge deck 1.

[0063] In some embodiments, the double steel plate bridge deck 1 includes several sets of H-beams arranged in sequence. The two side wall edges of the H-beams are welded in sequence to form a panel 11 and a back plate 12, and the middle wall of the H-beams forms a support body 13.

[0064] The double steel plate bridge deck 1 includes several groups of Z-shaped steel arranged in sequence. The two side walls of the Z-shaped steel are welded in sequence to form a panel 11 and a back plate 12, and the middle wall of the Z-shaped steel forms a support 13.

[0065] The double steel plate bridge deck 1 includes several sets of U-shaped steels arranged in sequence. The open end of the U-shaped steel is welded to the outer wall of the middle wall of the U-shaped steel in sequence to close the opening of the U-shaped steel. The two side walls of the U-shaped steel form the front panel 11 and the back panel 12 respectively, and the middle wall of the U-shaped steel forms the support body 13.

[0066] The double steel plate bridge deck 1 includes several sets of rectangular tubes arranged in sequence. The side walls of the rectangular tubes are welded in sequence. The upper and lower walls of the rectangular tubes form the panel 11 and the back plate 12, respectively. The side walls of the rectangular tubes form the support body 13.

[0067] like Figure 13 As shown, several sets of H-beams are laid flat, and the side walls of two adjacent sets of H-beams are welded together. The side walls of the H-beams form two planes, which serve as the front panel 11 and the back panel 12, respectively. The middle wall of the H-beams naturally becomes the support 13, which has the same function as the bridge deck web.

[0068] like Figure 15 As shown, several groups of Z-shaped steel are laid flat, and their welding method is the same as that of H-shaped steel. The plane formed by the two sides is used as the front panel 11 and the back panel 12, and the middle wall is used as the support 13.

[0069] like Figure 14 As shown, several sets of U-shaped steel are laid flat, with their open ends welded to the closed ends of adjacent sets of U-shaped steel, and the plane formed by their two sides serves as the panel 11 and back panel 12, with the middle wall serving as the support 13.

[0070] like Figure 12As shown, several sets of rectangular tubes are laid flat and welded to each other in sequence. The plane formed by the exposed side walls is the panel 11 and the back plate 12, while the connected side walls serve as the support 13.

[0071] Alternatively, two steel plates can be used as the front panel 11 and the back panel 12, and a bridge deck web or steel truss can be set in the middle as the support 13.

[0072] This led to a diversification of the raw materials used in the production of the double steel plate bridge deck 1.

[0073] In some embodiments, the panel 11 or the back panel 12 is a wide steel plate;

[0074] Several sets of T-shaped steel are welded to the surface of the wide steel plate. The vertical wall ends of the T-shaped steel are welded perpendicularly to the wide steel plate. The horizontal walls of the T-shaped steel are welded and fixed on both sides in sequence. All the horizontal walls of the T-shaped steel together form a plane.

[0075] Alternatively, a wide steel plate may be welded with several sets of channel steel, the open ends of which are welded to the wide steel plate, and the side walls of two adjacent sets of channel steel are welded and fixed, or a narrow steel plate may be welded and fixed between two adjacent sets of channel steel, with the middle wall of the narrow steel plate and the channel steel forming a plane.

[0076] like Figure 11 As shown, a whole steel plate is used as the back plate 12, and several sets of parallel T-shaped steel are welded to the upper surface of the back plate 12. The horizontal walls of several sets of T-shaped steel are welded and fixed to each other to form a new plane as the panel 11, while the vertical walls of the T-shaped steel serve as the support 13.

[0077] like Figure 12 As shown, a whole steel plate is used as the back plate 12, and several groups of parallel channel steels are arranged with their openings facing downwards. The opening ends are welded to the back plate 12, and the side walls of two adjacent groups of channel steels are welded and fixed so that their horizontal walls form a new plane. Alternatively, a narrow steel plate is welded between two groups of channel steels, and the narrow steel plate and the horizontal wall of the channel steel are on the same plane to form a new plane. The new plane is used as the front panel 11.

[0078] Both of the above solutions allow for the exchange of the front panel 11 and the back panel 12 during use, meaning that a single piece of steel plate is used as the front panel 11, ensuring the flatness of the front panel 11.

[0079] In some embodiments, the channel steel beam 2 includes a steel beam bottom plate 22 and steel beam web plates 21 welded to both sides of the steel beam bottom plate 22. The other side of the steel beam web plate 21 is fixedly connected to the outer surface of the back plate 12. The included angle α between the steel beam web plate 21 and the steel beam bottom plate 22 is a right angle or an obtuse angle.

[0080] like Figure 1 and Figure 2As shown, the channel steel beam 2 is made by splicing and welding the steel beam web plate 21 and the steel beam bottom plate 22, and the weld is straight, which facilitates automated welding processing. At the same time, when the included angle between the steel beam web plate 21 and the steel beam bottom plate 22 is selected as an obtuse angle, it can increase the overall torsional resistance of the box-type composite beam bridge. When the included angle between the steel beam web plate 21 and the steel beam bottom plate 22 is a right angle, it can facilitate transportation.

[0081] In some embodiments, a support plate 23 is fixedly connected to the side of the steel beam web 21 away from the steel beam bottom plate 22, and the support plate 23 is in contact with and fixedly connected to the back plate 12.

[0082] like Figure 5 As shown, a horizontally arranged support plate 23 is provided at the top of the web plate 21 of the steel beam. The support plate 23 is directly attached to the back plate 12. Therefore, the support plate 23 can be connected and fixed to the back plate 12 by welding, or the support plate 23 can be connected and fixed to the back plate 12 by bolts, providing multiple connection methods.

[0083] In some embodiments, a plurality of sets of channel steel beams 2 are fixedly arranged below the back plate 12, and a transverse connecting body 3 is provided between adjacent channel steel beams 2, or adjacent sets of channel steel beams 2 are welded and fixed together.

[0084] like Figure 6 As shown, when the beam bridge is wide, multiple sets of channel steel beams 2 are used to support the double steel plate bridge deck 1. A transverse connecting body 3 is placed between adjacent channel steel beams 2 to stabilize the relative position of adjacent channel steel beams 2, thereby improving the overall torsional resistance.

[0085] Similarly, for structures with multiple sets of beam bridges spliced ​​together, the overall stability can also be increased by adding connecting bodies 3, which are also arranged in parallel below several sets of channel steel beams 2.

[0086] In some embodiments, the casting hole 14 is provided at the longitudinal end of the double steel plate bridge deck 1, and the end of the support body 13 is within the orthogonal projection area of ​​the casting hole 14.

[0087] like Figure 8 and Figure 9 As shown, a casting hole 14 is provided on the surface of the panel 11, and the end of the support body 13 is exposed at the position of the casting hole 14, which facilitates the bolt connection of the end of the support body 13 during splicing.

[0088] In some embodiments, when two adjacent sets of double steel plate bridge decks 1 are longitudinally spliced, the corresponding positions at the ends of all back plates 12 and supports 13 are connected by friction type with high-strength bolts.

[0089] When two adjacent sets of channel steel beams 2 are longitudinally spliced, the corresponding positions at the ends of the channel steel beams 2 are connected by friction type high-strength bolts.

[0090] like Figures 7-9 As shown, during the longitudinal splicing of the box girder bridge, the ends of the back plate 12, support body 13, steel beam web 21 and steel beam bottom plate 22 are all connected by high-strength bolt friction type connection to ensure stable connection.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0092] The box-girder composite beam bridge provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A box-girder composite girder bridge, characterized in that, include: The double steel plate bridge deck (1) includes a front panel (11) and a back panel (12); a support (13) is provided between the front panel (11) and the back panel (12) for connecting the front panel (11) and the back panel (12); the surface of the front panel (11) is provided with a pouring hole (14) for filling concrete into the cavity between the front panel (11) and the back panel (12); The channel steel beam (2) has its open end fixedly connected to the back plate (12) of the double steel plate bridge deck (1).

2. The box-girder composite girder bridge according to claim 1, characterized in that, The panel (11) and the back plate (12) are arranged in parallel. The support (13) consists of several sets of parallel bridge deck webs. The two sides of the bridge deck webs are respectively fixedly connected to the panel (11) and the back plate (12).

3. The box-girder composite girder bridge according to claim 1, characterized in that, The panel (11) and the back plate (12) are arranged in parallel, and the support (13) is a steel truss. The two ends of the steel truss are respectively fixedly connected to the panel (11) and the back plate (12).

4. The box-girder composite girder bridge according to claim 1, characterized in that, The double steel plate bridge deck (1) includes several sets of H-beams arranged in sequence. The two side walls of the H-beams are welded in sequence to form the front panel (11) and the back panel (12). The middle wall of the H-beams forms the support body (13). Alternatively, the double steel plate bridge deck (1) may include several groups of Z-shaped steel arranged in sequence, with the two side walls of the Z-shaped steel being welded in sequence to form the panel (11) and the back plate (12), and the middle wall of the Z-shaped steel forming the support body (13). Alternatively, the double steel plate bridge deck (1) may include several sets of U-shaped steels arranged in sequence. The open end of the U-shaped steel is sequentially welded to the outer wall of the middle wall of the U-shaped steel to close the opening of the U-shaped steel. The two side walls of the U-shaped steel respectively form the front panel (11) and the back panel (12), and the middle wall of the U-shaped steel forms the support body (13). Alternatively, the double steel plate bridge deck (1) may include several sets of rectangular tubes arranged in sequence, the side walls of the rectangular tubes are welded in sequence, the upper and lower walls of the rectangular tubes respectively form the panel (11) and the back plate (12), and the side walls of the rectangular tubes form the support (13).

5. The box-girder composite girder bridge according to claim 1, characterized in that, The front panel (11) or the back panel (12) is a wide steel plate; Several sets of T-shaped steel are welded to the surface of the wide steel plate. The vertical wall ends of the T-shaped steel are welded perpendicularly to the wide steel plate. The horizontal walls of the T-shaped steel are welded and fixed on both sides in sequence. All the horizontal walls of the T-shaped steel together form a plane. Alternatively, several sets of channel steels may be welded to the surface of the wide steel plate, with the open ends of the channel steels welded to the wide steel plate, and the side walls of two adjacent sets of channel steels welded and fixed, or a narrow steel plate may be welded and fixed between two adjacent sets of channel steels, with the narrow steel plate and the middle wall of the channel steel forming a plane.

6. The box-girder composite girder bridge according to claim 1, characterized in that, The channel steel beam (2) includes a steel beam bottom plate (22) and steel beam web plates (21) welded to both sides of the steel beam bottom plate (22). The other side of the steel beam web plate (21) is fixedly connected to the outer surface of the back plate (12). The included angle α between the steel beam web plate (21) and the steel beam bottom plate (22) is a right angle or an obtuse angle.

7. The box-girder composite girder bridge according to claim 6, characterized in that, A support plate (23) is fixedly connected to the side of the web plate (21) of the steel beam away from the bottom plate (22). The support plate (23) is in contact with the back plate (12) and is fixedly connected to it.

8. The box-girder composite girder bridge according to claim 1, characterized in that, Several sets of channel steel beams (2) are fixedly installed below the back plate (12), and a transverse connecting body (3) is provided between adjacent channel steel beams (2), or two adjacent sets of channel steel beams (2) are welded and fixed.

9. The box-girder composite girder bridge according to claim 1, characterized in that, The casting hole (14) is located at the longitudinal end of the double steel plate bridge deck (1), and the end of the support (13) is located within the orthographic projection area of ​​the casting hole (14).

10. The box-girder composite girder bridge according to any one of claims 1-9, characterized in that, When the two adjacent sets of double steel plate bridge decks (1) are longitudinally spliced, the corresponding positions of the ends of all the back plates (12) and the support bodies (13) are connected by friction type with high-strength bolts. When two adjacent sets of the channel steel beams (2) are longitudinally spliced, the corresponding positions at the ends of the channel steel beams (2) are connected by friction type with high-strength bolts.

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