High-strength large-span combined steel bridge

Abstract

The application provides a high-strength large-span combined steel bridge, which is used to solve the technical problems of single connection mode, low installation efficiency and insufficient overall stability of the existing bridge, and the bridge comprises a plurality of bridge devices connected head to tail, each device comprises two symmetrically arranged truss assemblies connected through a middle frame. The truss assembly comprises a cross frame unit arranged along the extension direction of the bridge, the cross frame unit comprises two pairs of upper and lower connecting pieces, each connecting piece comprises two open channel steels. The vertical fixing assembly comprises a plurality of vertical connecting units, the vertical connecting unit comprises a connecting rod and connecting heads connected to both ends of the connecting rod, the connecting heads are fixedly connected between the upper and lower connecting pieces of the same cross frame unit, and are also fixedly connected between the connecting pieces of the two truss assemblies. A fixing block is arranged in the opening of one end of each channel steel, a fixing hole is further arranged on the cross frame unit, the fixing hole penetrates the fixing block, the connecting head and the channel steel, and a fixing pipe is arranged in the fixing hole.

Description

Technical Field

[0001] This invention relates to a high-strength, long-span composite steel bridge. Background Technology

[0002] With the rapid development of transportation infrastructure construction, long-span bridges are increasingly widely used in highways, railways, and urban elevated roads. Steel bridges, due to their high strength, light weight, and short construction period, have become an important choice for long-span bridge construction. However, existing long-span steel bridges still face many technical challenges in structural design, installation, and overall stability.

[0003] Chinese patent CN116949913A discloses a steel structure bridge that employs a truss structure, with components connected by welding. In this design, the truss components are primarily fixed using a single welding connection method, resulting in a relatively simple connection method between the crossbeam units at each level, thus limiting the overall mechanical performance. Under high-strength, long-span conditions, this single connection method is insufficient to effectively distribute and transfer loads, leading to localized stress concentration and insufficient load-bearing capacity. Furthermore, the truss structure in this design has limited collaborative support capabilities in both the vertical and horizontal directions, making it difficult to meet stability requirements under complex stress conditions.

[0004] Chinese patent CN115787490A discloses another type of composite steel bridge structure. This structure adopts a modular design, using bolted connections to assemble bridge units. While this approach simplifies the on-site installation process to some extent, the installation procedures remain relatively cumbersome. Specifically, the fixing methods for each connection node are not flexible enough, requiring individual bolt tightening with high positioning accuracy, making on-site operation difficult, resulting in low installation efficiency and a long construction period. Furthermore, this design lacks effective auxiliary reinforcement measures between vertically layered components, and the horizontal connection strength is insufficient, leading to weak lateral resistance of the overall structure under lateral wind loads or seismic forces.

[0005] In summary, existing long-span steel bridges mainly suffer from the following three technical problems: First, the connection methods between components are relatively simple, resulting in limited overall mechanical performance and difficulty in meeting the load-bearing requirements under high-strength, long-span conditions; second, the installation process is cumbersome, and the fixing methods of each connection node are not flexible enough, leading to low on-site installation efficiency and a long construction period; third, the coordinated support capacity in the vertical and horizontal directions is insufficient, and the overall structural stability needs to be improved. Therefore, there is an urgent need for a composite steel bridge structure that can balance high-strength mechanical performance with rapid installation. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-strength, long-span composite steel bridge to overcome the technical defects of existing bridge structures, such as the single connection method between components, limited overall mechanical performance, cumbersome installation procedures, inflexible fixing methods of each connection node leading to low on-site installation efficiency, insufficient collaborative support capacity in the vertical and horizontal directions, and the need to improve the overall structural stability.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A high-strength, long-span composite steel bridge, comprising several bridge devices connected end-to-end, each bridge device comprising two symmetrically arranged truss assemblies connected by an intermediate frame.

[0009] The truss assembly includes crossbeam units arranged along the extension direction of the bridge. The crossbeam units have at least three layers along the vertical direction of the bridge and are connected by vertical fixing components. The crossbeam units have at least four layers along the horizontal direction of the bridge and are connected by horizontal fixing components.

[0010] The cross frame unit includes two pairs of connecting members that are connected vertically, and each connecting member includes two channel steels with openings facing outwards.

[0011] The vertical fixing assembly includes multiple vertical connecting units. Each vertical connecting unit includes a connecting rod and a connector connected to both ends of the connecting rod. The connector is used to connect the connecting parts of the same cross frame unit. The connector is also used to connect two sets of truss assemblies.

[0012] The horizontal fixing assembly includes multiple connecting lugs and multiple crossbars, with the multiple connecting lugs connected between the channel steels of the same connector and the multiple crossbars connected to the connecting rods along the vertical direction of the bridge;

[0013] Each of the channel steels has a fixing block in the opening at one end, and the cross frame unit also has a fixing hole. The fixing hole passes through the fixing block, the connector and the channel steel, and a fixing pipe passes through the fixing hole.

[0014] Furthermore, the fixing block includes an integrally formed punched portion and a fixing portion, the fixing hole being located on the punched portion, the punched portion cooperating with the width direction of the opening, and the fixing portion including two protruding angles extending in the length direction of the opening.

[0015] Furthermore, it also includes an auxiliary fixing component, which is disposed between two sets of horizontal frame units in the vertical direction. The auxiliary fixing component includes several diagonal frames connected in a rectangle, one end of which is connected to the horizontal frame unit and the other end of which is connected to the vertical connecting unit.

[0016] Furthermore, the auxiliary fixing assembly also includes an inner beam, which is connected between the crossbeam units along the vertical direction of the bridge. The inner beam is located at one end of the crossbeam unit and in the middle of the crossbeam unit.

[0017] Furthermore, the auxiliary fixing assembly also includes an outer beam that is connected to the inner beam along the vertical direction of the bridge.

[0018] Furthermore, each connector has at least four connecting lugs between its channel steel sections, and each connecting lug has a lug hole.

[0019] Furthermore, the outer beam is also connected to the outer connecting earring through the earring hole along the extension direction of the bridge.

[0020] Furthermore, the connector includes connecting pieces symmetrically connected to both sides of the connecting rod. The connecting pieces are provided with at least two layers in the vertical direction and are respectively connected to two layers of connecting members. One side of the connecting piece passes through the two channel steels of the connecting member of a truss assembly and is fixed by welding. The other side of the connecting piece passes through the two channel steels of the connecting member of another truss assembly and is fixed by welding and fixing pipe.

[0021] Furthermore, the intermediate frame includes horizontal plates and inclined plates, the horizontal plates being used to connect truss assemblies, and the horizontal plates being fixedly connected to each other via inclined plates.

[0022] Furthermore, the connecting rod and the connector are fixed together by welding.

[0023] Compared with the prior art, the beneficial effects of the present invention are: by setting at least three layers of cross frame units in the vertical direction and at least four layers in the horizontal direction of the truss assembly, and using vertical fixing components and horizontal fixing components for multi-dimensional connection, the present invention constructs a spatial three-dimensional force system, which significantly improves the overall load-bearing capacity and mechanical performance of the bridge, and can meet the use requirements of high-strength and large-span working conditions.

[0024] This invention achieves rapid positioning and reliable fixing of each connection node through the design of fixing blocks, fixing holes, and fixing pipes. The perforated part of the fixing block matches the width direction of the channel steel opening, and the protruding corner structure of the fixing part effectively prevents the fixing block from rotating or falling off inside the channel steel, making the installation operation more convenient and effectively improving the on-site installation efficiency.

[0025] The auxiliary fixing components provided in this invention include a diagonal frame, an inner beam, and an outer beam. The diagonal frame connects the horizontal frame units and the vertical connection units to form a rectangular reinforced frame. The inner beam and the outer beam further enhance the collaborative support between the horizontal frame units of each layer, thereby improving the overall stability of the structure from multiple directions.

[0026] In this invention, the connector adopts a symmetrical connecting plate structure. The connecting plates are inserted between the channel steel and are fixed by welding and fixing pipes, resulting in high connection reliability. The combination design of the horizontal and inclined plates of the intermediate frame further enhances the lateral connection strength between the two sets of truss components, and the overall structure has good coordination. Attached Figure Description

[0027] Figure 1 This is a top view of the vertical connection unit of a high-strength, long-span composite steel bridge.

[0028] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure cut along the AA direction;

[0029] Figure 3 yes Figure 2 A magnified view of a section of E;

[0030] Figure 4 This is a schematic diagram of the side structure of a high-strength, long-span composite steel bridge.

[0031] Figure 5 This is a three-dimensional structural diagram of a high-strength, long-span composite steel bridge.

[0032] Figure 6 yes Figure 5 A magnified view of a section of A;

[0033] Figure 7 yes Figure 5 A magnified view of a section of B;

[0034] Figure 8 yes Figure 5 A magnified view of a section of C;

[0035] Figure 9 yes Figure 5 A magnified view of a section of D;

[0036] Figure 10 This is a three-dimensional structural diagram of the vertical connection unit of a high-strength, long-span composite steel bridge.

[0037] In the diagram: 1. Bridge assembly, 2. Truss assembly, 3. Intermediate frame, 4. Cross frame unit, 5. Vertical fixing assembly, 6. Horizontal fixing assembly, 7. Connector, 8. Channel steel, 9. Vertical connection unit, 10. Connecting rod, 11. Connecting head, 12. Connecting lug, 13. Crossbar, 14. Fixing block, 15. Fixing hole, 16. Fixing pipe, 17. Drilled part, 18. Fixing part, 19. Angle protrusion, 20. Auxiliary fixing assembly, 21. Diagonal frame, 22. Inner beam, 23. Outer beam, 24. Lug hole, 25. Connecting piece, 26. Cross plate, 27. Diagonal plate. Detailed Implementation

[0038] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0039] Example 1

[0040] Please refer to Figure 1-9 This invention proposes a high-strength, long-span composite steel bridge. The bridge includes several bridge devices 1 connected end-to-end. Each bridge device 1 includes two symmetrically arranged truss assemblies 2, which are connected by an intermediate frame 3. Each truss assembly 2 includes a transverse frame unit 4 arranged along the extension direction of the bridge. The transverse frame unit 4 has at least three layers along the vertical direction of the bridge and is connected by a vertical fixing assembly 5. The transverse frame unit 4 has at least four layers along the horizontal direction of the bridge and is connected by a horizontal fixing assembly 6. Each transverse frame unit 4 includes two pairs of vertically connected connectors 7, each connector 7 including two outwardly opening channel steels 8. The vertical fixing assembly 5 includes multiple vertical connecting units 9. Each vertical connecting unit 9 includes a connecting rod 10 and a connector 11 connected to both ends of the connecting rod 10. The connector 11 is used to connect the connectors 7 of the same transverse frame unit 4 and also to connect two sets of truss assemblies 2.

[0041] The horizontal fixing assembly 6 includes multiple connecting lugs 12 and multiple crossbars 13. The multiple connecting lugs 12 are connected between the channel steels 8 of the same connector 7, and the multiple crossbars 13 are connected to the connecting rods 10 along the vertical direction of the bridge. Each channel steel 8 has a fixing block 14 in the opening at one end. The crossbar unit 4 also has a fixing hole 15, which passes through the fixing block 14, the connector 11, and the channel steel 8, and a fixing tube 16 passes through the fixing hole 15. The fixing block 14 includes an integrally formed perforated part 17 and a fixing part 18. 5 is located on the perforated part 17, which mates with the width direction of the opening. The fixing part 18 includes two protruding angles 19 extending in the length direction of the opening. It also includes an auxiliary fixing component 20, which is disposed between two sets of crossbeam units 4 in the vertical direction. The auxiliary fixing component 20 includes several diagonal brackets 21 connected in a rectangle. One end of the diagonal bracket 21 is connected to the crossbeam unit 4, and the other end is connected to the vertical connecting unit 9. The auxiliary fixing component 20 also includes an inner beam 22, which is connected to the crossbeam along the vertical direction of the bridge. Between units 4, the inner beam 22 is located at one end of the crossbeam unit 4 and in the middle of the crossbeam unit 4; the auxiliary fixing assembly 20 also includes an outer beam 23, which is connected to the inner beam 22 along the vertical direction of the bridge; each connector 7 has at least four connecting lugs 12 between the channel steels 8, and each connecting lug 12 has a lug hole 24; the outer beam 23 is also connected to the outer connecting lug 12 through the lug hole 24 along the extension direction of the bridge; the connector 11 includes connecting pieces 25 symmetrically connected to both sides of the connecting rod 10, and the connecting pieces 25 are connected along the vertical direction of the bridge. The frame has at least two layers in the vertical direction and is connected to two layers of connectors 7 respectively. One side of the connecting piece 25 passes through the two channel steels 8 of the connector 7 of one truss assembly 2 and is fixed by welding. The other side of the connecting piece 25 passes through the two channel steels 8 of the connector 7 of another truss assembly 2 and is fixed by welding and fixing pipe 16. The intermediate frame 3 includes a horizontal plate 26 and an inclined plate 27. The horizontal plate 26 is used to connect the truss assembly 2, and the horizontal plates 26 are fixedly connected by the inclined plate 27. The connecting rod 10 is fixed to the connector 11 by welding.

[0042] Specifically, the bridge comprises several bridge components 1 connected end-to-end. These bridge components 1 are sequentially connected along the bridge's extension direction to form a complete bridge structure that meets the design span requirements. Each bridge component 1 includes two symmetrically arranged truss assemblies 2, which are interconnected by an intermediate frame 3. The two truss assemblies 2 are symmetrically arranged on both sides of the bridge, and the intermediate frame 3 laterally connects the two truss assemblies 2, ensuring the integrity and stress balance of the bridge component 1 in the lateral direction. This modular combination of several bridge components 1 connected end-to-end facilitates factory prefabrication and rapid on-site assembly, effectively shortening the construction period and adapting to different span requirements.

[0043] The truss assembly 2 includes crossbeam units 4 arranged along the extension direction of the bridge. The crossbeam units 4 have at least three layers along the vertical direction of the bridge, with each layer connected by a vertical fixing component 5; the crossbeam units 4 also have at least four layers along the horizontal direction of the bridge, with each layer connected by a horizontal fixing component 6. By setting multiple layers of crossbeam units 4 in both the vertical and horizontal directions, a spatial three-dimensional grid stress system is formed, which can effectively distribute and transfer loads from multiple directions. Compared with single-layer or planar truss structures, this significantly improves the overall load-bearing capacity and span capacity of the bridge, meeting the requirements of high-strength, large-span working conditions.

[0044] The horizontal frame unit 4 includes two pairs of vertically connected connectors 7, each connector 7 comprising two outward-facing channel steels 8. The two channel steels 8 of the same connector 7 have their openings facing each other, providing a structural basis for the insertion and fixing of the connector head 11 of the vertical fixing component 5. The two pairs of connectors 7 of the horizontal frame unit 4 are vertically connected, forming a two-layer connection structure, which respectively cooperates with the connector head 11 of the vertical fixing component 5 to achieve multi-layer vertical connection. The outward-facing openings of the channel steels 8 facilitate the embedding of the fixing block 14 and the insertion of the fixing pipe 16, simplifying on-site installation.

[0045] The vertical fixing component 5 includes multiple vertical connecting units 9, each of which includes a connecting rod 10 and connectors 11 connected to both ends of the connecting rod 10. The connectors 11 are fixedly connected between the upper and lower connecting parts 7 of the same crossbeam unit 4, achieving a reliable connection between the crossbeam units 4 in the vertical direction, connecting the crossbeam units 4 in series to form a whole, and ensuring the continuity of force transmission in the vertical direction. The connectors 11 are also fixedly connected between the connecting parts 7 of the two sets of truss components 2, achieving lateral constraint between the two sets of truss components 2, enhancing the overall structural integrity, and preventing relative displacement of the two truss components 2 under lateral loads. The connecting rods 10 and connectors 11 are fixed by welding, ensuring the integrity of the vertical connecting unit 9 and the reliability of force transmission, and preventing loosening or detachment of the connection points.

[0046] The horizontal fixing assembly 6 includes multiple connecting lugs 12 and multiple crossbars 13. The multiple connecting lugs 12 connect between two channel steels 8 of the same connector 7, forming a multi-point connection in the horizontal direction, effectively limiting the relative displacement of the channel steels 8 in the horizontal direction. The multiple crossbars 13 connect to the connecting rods 10 along the vertical direction of the bridge. The crossbars 13 extend along the horizontal direction of the bridge, connecting the connecting rods 10 of each layer in the vertical direction in series in the horizontal direction, realizing the coordinated force-bearing of each layer of horizontal frame units 4. The combined configuration of the connecting lugs 12 and crossbars 13 enhances the horizontal connection strength from two levels, effectively improving the overall horizontal stiffness and coordination of the structure.

[0047] Each channel steel 8 has a fixing block 14 installed in the opening at one end, and the crossbeam unit 4 also has a fixing hole 15. The fixing hole 15 passes through the fixing block 14, the connector 11, and the channel steel 8, and a fixing tube 16 passes through the fixing hole 15. During installation, the fixing block 14 is inserted into the opening of the channel steel 8, the connector 11 is inserted into the clamping space of the channel steel 8, and the fixing hole 15 is aligned before the fixing tube 16 is inserted. The fixing tube 16 locks the fixing block 14, the connector 11, and the channel steel 8 in series, forming a reliable mechanical connection. This connection method eliminates the need for tightening each bolt individually, simplifies the positioning operation, effectively improves on-site installation efficiency, and shortens the construction cycle.

[0048] The fixing block 14 includes an integrally formed perforated portion 17 and a fixing portion 18, with a fixing hole 15 located on the perforated portion 17. The width of the perforated portion 17 is adapted to the width of the opening of the channel steel 8. After the perforated portion 17 is embedded into the opening of the channel steel 8, it fits tightly with the width direction of the opening, restricting the movement of the fixing block 14 in the width direction and ensuring positioning accuracy. The fixing portion 18 includes two protruding angles 19 extending into the length direction of the opening of the channel steel 8. The protruding angles 19 abut against the inner wall of the channel steel 8, increasing the contact and welding area between the fixing block 14 and the inner wall of the channel steel 8, effectively preventing the fixing block 14 from rotating or axially falling off within the channel steel 8, and improving the stability and shear resistance of the connection. The perforated portion 17 and the fixing portion 18 are integrally formed, ensuring the overall strength of the fixing block 14 and avoiding weak points in the connection that may occur in a split structure.

[0049] The invention also includes an auxiliary fixing component 20, which is disposed between two sets of crossbeam units 4 in the vertical direction. The auxiliary fixing component 20 includes several diagonal brackets 21, which are connected to form a rectangular frame. One end of each diagonal bracket 21 is connected to the crossbeam unit 4, and the other end is connected to the vertical connecting unit 9. The diagonal brackets 21 are arranged diagonally between the crossbeam unit 4 and the vertical connecting unit 9, forming a stable structure through diagonal support. This effectively enhances the overall stiffness between the crossbeam units 4, improves the structure's torsional resistance and lateral deformation resistance, thereby enhancing the overall stability of the bridge structure in both the vertical and horizontal directions.

[0050] The auxiliary fixing assembly 20 also includes an inner beam 22, which connects the crossbeam units 4 along the vertical direction of the bridge. The inner beam 22 is located at one end and the middle of the crossbeam unit 4, forming a double-point support at the end and the middle. The inner beam 22 at the end constrains the displacement at the end of the crossbeam unit 4, while the inner beam 22 in the middle effectively controls the mid-span deflection of the crossbeam unit 4. The two work together to further enhance the connection stiffness between the crossbeam units 4 in the vertical direction and improve the structure's resistance to vertical loads.

[0051] The auxiliary fixing component 20 also includes an outer beam 23, which is connected to the inner beam 22 along the vertical direction of the bridge. The outer beam 23 and the inner beam 22 work together to form a double-layered reinforcement structure, further enhancing the support stiffness on the outer side of the structure. The inner beam 22 undertakes the main vertical connection function, while the outer beam 23 adds external stiffness constraint based on the inner beam 22. Together, they effectively improve the overall load-bearing capacity of the auxiliary fixing component 20, enhancing the overall structural stability from multiple directions.

[0052] At least four connecting lugs 12 are provided between the channel steels 8 of each connector 7, and each connecting lug 12 has a lug hole 24. The arrangement of multiple connecting lugs 12 increases the number of horizontal connection points, improving the reliability and redundancy of the connection. The outer beam 23 is also connected to the outer connecting lugs 12 through the lug holes 24 along the extension direction of the bridge. The outer beam 23 is fixed by cooperating with the connecting lugs 12 through the lug holes 24, realizing the coordinated fixation of the outer beam 23 and the horizontal fixing component 6, enhancing the integrity of the auxiliary fixing component 20 and the main structure. At the same time, the lug holes 24 facilitate the installation, adjustment and subsequent connection of the outer beam 23 and subsequent auxiliary facilities.

[0053] The connector 11 includes connecting pieces 25 symmetrically connected to both sides of the connecting rod 10. Each connecting piece 25 has at least two layers along the vertical direction and is connected to two layers of connecting members 7 respectively, achieving synchronous connection of the connector 11 to multiple layers of connecting members 7 and ensuring the overall integrity of the connection between each layer of horizontal frame units 4 in the vertical direction. One side of the connecting piece 25 passes between two channel steels 8 of the connecting member 7 of one truss assembly 2 and is fixed by welding. The welded connection ensures the main load-bearing capacity of this side. The other side of the connecting piece 25 passes between two channel steels 8 of the connecting member 7 of another truss assembly 2 and is fixed by welding and fixing pipe 16. This dual fixing method of welding and fixing pipe 16 ensures connection strength and facilitates adjustment and positioning during on-site installation. The symmetrical structure of the connecting pieces 25 ensures the force balance of the connector 11 and ensures that the connection strength and stiffness between the two sets of truss assemblies 2 meet the design requirements.

[0054] The intermediate frame 3 includes horizontal plates 26 and inclined plates 27. The horizontal plates 26 connect the truss components 2 on both sides, and are fixedly connected to each other via the inclined plates 27. The horizontal plates 26 directly connect the truss components 2 on both sides, providing lateral connection. The inclined plates 27 are obliquely positioned between the horizontal plates 26, effectively improving the shear strength of the intermediate frame 3, preventing relative displacement of the horizontal plates 26 under load, and enhancing the lateral connection strength between the two sets of truss components 2. The connecting rod 10 and the connecting head 11 are fixed by welding. The welded connection ensures the integrity and force transmission reliability of the vertical connection unit 9, avoids loosening of the connection under repeated loads, and ensures the long-term safety of the bridge structure.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-strength, long-span composite steel bridge, characterized in that, The bridge includes several bridge devices connected end to end, and each bridge device includes two symmetrically arranged truss assemblies connected by an intermediate frame. The truss assembly includes crossbeam units arranged along the extension direction of the bridge. The crossbeam units have at least three layers along the vertical direction of the bridge and are connected by vertical fixing components. The crossbeam units have at least four layers along the horizontal direction of the bridge and are connected by horizontal fixing components. The cross frame unit includes two pairs of connecting members that are connected vertically, and each connecting member includes two channel steels with openings facing outwards. The vertical fixing assembly includes multiple vertical connecting units. Each vertical connecting unit includes a connecting rod and a connector connected to both ends of the connecting rod. The connector is used to connect the connecting parts of the same cross frame unit. The connector is also used to connect two sets of truss assemblies. The horizontal fixing assembly includes multiple connecting lugs and multiple crossbars, with the multiple connecting lugs connected between the channel steels of the same connector and the multiple crossbars connected to the connecting rods along the vertical direction of the bridge; Each of the channel steels has a fixing block in the opening at one end, and the cross frame unit also has a fixing hole. The fixing hole passes through the fixing block, the connector and the channel steel, and a fixing pipe passes through the fixing hole.

2. A high-strength, long-span composite steel bridge according to claim 1, characterized in that, The fixing block includes a punched part and a fixing part integrally formed and connected. The fixing hole is located on the punched part. The punched part is matched with the width direction of the opening. The fixing part includes two protruding corners extending in the length direction of the opening.

3. A high-strength, long-span composite steel bridge according to claim 2, characterized in that, It also includes an auxiliary fixing component, which is disposed between two sets of horizontal frame units in the vertical direction. The auxiliary fixing component includes several diagonal frames connected in a rectangle. One end of the diagonal frame is connected to the horizontal frame unit, and the other end is connected to the vertical connecting unit.

4. A high-strength, long-span composite steel bridge according to claim 3, characterized in that, The auxiliary fixing assembly also includes an inner beam, which is connected between the crossbeam units along the vertical direction of the bridge. The inner beam is located at one end of the crossbeam unit and in the middle of the crossbeam unit.

5. A high-strength, long-span composite steel bridge according to claim 4, characterized in that, The auxiliary fixing assembly also includes an outer beam, which is connected to the inner beam along the vertical direction of the bridge.

6. A high-strength, long-span composite steel bridge according to claim 5, characterized in that, Each connector has at least four connecting lugs between its channel steel sections, and each connecting lug has a lug hole.

7. A high-strength, long-span composite steel bridge according to claim 6, characterized in that, The outer beam is also connected to the outer connecting earring through the earring hole along the extension direction of the bridge.

8. A high-strength, long-span composite steel bridge according to claim 1, characterized in that, The connector includes connecting pieces symmetrically connected to both sides of the connecting rod. The connecting pieces are provided with at least two layers in the vertical direction and are respectively connected to two layers of connecting members. One side of the connecting piece passes through the two channel steels of the connecting member of a truss assembly and is fixed by welding. The other side of the connecting piece passes through the two channel steels of the connecting member of another truss assembly and is fixed by welding and fixing pipe.

9. A high-strength, long-span composite steel bridge according to claim 1, characterized in that, The intermediate frame includes horizontal plates and inclined plates. The horizontal plates are used to connect truss assemblies, and the horizontal plates are fixedly connected to each other by inclined plates.

10. A high-strength, long-span composite steel bridge according to claim 1, characterized in that, The connecting rod and the connector are fixed together by welding.

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