Assembled steel-concrete composite structure beam bridge, assembly method and fixing device

Abstract

The present invention relates to an assembled steel-concrete composite structure beam bridge, an assembly method, and a fixing device, comprising a concrete top plate, a concrete bottom plate disposed at the bottom of the concrete top plate, steel frame plates disposed on both sides of the concrete top plate and the concrete bottom plate, an extension portion disposed on the inner side of the steel frame plate, both sides of the concrete top plate and the concrete bottom plate extending to the inner side of the extension portion and interlocking with the extension portion, the concrete top plate and the concrete bottom plate being connected to the steel frame plate via a connecting structure, a steel beam disposed on the inner side of the steel frame plate between the concrete top plate and the concrete bottom plate, a bracket fixedly connected to the inner side of the steel beam, both ends of the steel beam extending to the interior of the extension portion and interlocking with the extension portion. The present invention can improve the connection efficiency of existing beam bridges, replace the operation steps that can only be connected by pouring, reduce the prefabrication time of the beam bridge, and save the time of waiting for the connecting concrete to solidify.

Description

Technical Field

[0001] The present invention relates to the technical field of beam bridges, and in particular to an assembled steel-concrete composite structure beam bridge, an assembling method and a fixing device. Background Art

[0002] A beam bridge is a bridge with a main beam that is mainly subjected to bending as a load-bearing component. The main beam can be a solid beam or a truss beam. The rods of the truss beam bear axial force, the material can be fully utilized, the dead weight is light, and the span capacity is large. It is mostly used to build large-span bridges.

[0003] Beam bridges are mainly composed of steel webs and concrete top plates. However, the connection efficiency of existing beam bridges is poor. Generally, they can only be connected by pouring. The prefabrication time is long and it is necessary to wait for the connecting concrete to solidify, which seriously affects the connection efficiency of beam bridges.

[0004] Therefore, it is necessary to design and transform the steel-concrete composite structure beam bridge to effectively improve the connection efficiency of the steel-concrete composite structure beam bridge. Summary of the Invention

[0005] In view of this, the present invention provides an assembled steel-concrete composite structure beam bridge, an assembly method and a fixing device, which have the advantage of being able to be spliced and assembled, and solve the problem that the connection efficiency of existing beam bridges is poor, and generally can only be connected by pouring, the prefabrication time is long, and it is necessary to wait for the connecting concrete to solidify, which seriously affects the connection efficiency of the beam bridge.

[0006] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions: The present invention provides an assembled steel-concrete composite structure beam bridge, including a concrete top plate, a concrete bottom plate and a steel frame plate. There are two steel frame plates, and the inner upper ends of the two steel frame plates are respectively detachably connected to the two sides of the concrete top plate, and the inner lower ends are respectively detachably connected to the two sides of the concrete bottom plate. The upper and lower ends of the inner sides of the steel frame plates are both provided with connecting mechanisms, and the connecting mechanisms are used to be detachably connected to the concrete top plate or the concrete bottom plate.

[0007] In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, the connecting mechanism includes two extensions extending toward the inner side of the steel frame plate, both of the extensions are parallel to the concrete top plate and the concrete bottom plate, and a long strip-shaped mounting groove is formed between the extensions, and the two sides of the concrete top plate and the concrete bottom plate are respectively connected to the mounting grooves of the steel frame plates on both sides.

[0008] In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, a steel beam is respectively provided below the concrete top plate and above the concrete bottom plate, with both ends of the steel beam respectively mounted on the connecting mechanisms on both sides, and the two steel beams are connected by a bracket;

[0009] The two steel beams are connected via the two brackets, and the two steel beams and the two brackets form an "I"-shaped structure. A vertical plate is fixedly arranged in the internal space enclosed by the two steel beams and the two brackets.

[0010] In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, a steel plate is provided below the concrete bottom plate, and both ends of the steel plate are respectively mounted on the connecting mechanisms on both sides.

[0011] In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, the connecting mechanism also includes a bolt assembly, and the concrete top plate, the concrete bottom plate, the steel beam and the steel plate are all detachably connected to the corresponding extension part through a threaded assembly.

[0012] In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, a corner plate is fixedly provided on the inner side of the steel frame plate, one side surface of the corner plate is fixedly connected to the surface of the inner extension part, a load-bearing groove is opened in the center of the corner plate, and the cross-sectional shapes of the corner plate and the load-bearing groove are both triangular.

[0013] In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, damping plates are provided in the gaps between the concrete top plate and the steel beam, between the concrete bottom plate and the steel beam, and between the concrete bottom plate and the steel plate, and the damping plates are located between the end faces of the extension portions corresponding to the steel frame plates on both sides.

[0014] In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, the assembled steel-concrete composite structure beam bridge also includes a steel cable, both ends of which pass through the steel beam, vertical plate, damping plate, concrete bottom plate and steel plate, and are closed and connected at the bottom of the steel plate.

[0015] The present invention also provides an assembly method for an assembled steel-concrete composite structure beam bridge, comprising the following steps:

[0016] S1: Place two steel frame plates opposite to each other, then insert both sides of the concrete top plate between the two steel frame plates through the upper extensions. After the concrete top plate is installed, insert both sides of the steel beam between the two steel frame plates through the upper extensions. Connect the steel beam, the upper extensions of the steel frame plates, and the concrete top plate using threaded components.

[0017] S2: Hoist the concrete top plate, allowing the steel frame plate to rise with it. Insert the two sides of the concrete bottom plate between the two steel frame plates through the extensions below. Use the screw components again to connect the concrete bottom plate, the extensions below the steel frame plate, and the steel plate, thus completing the splicing and assembly of the beam bridge.

[0018] S3: Steel cables are installed between the steel beams, concrete base plate and steel frame to effectively support the suspended part of the concrete base plate through the tension of the steel cables.

[0019] The present invention also provides a fixing device for connecting beam bridges, which is used to fix the adjacent end faces of two adjacent beam bridges, including two upper fixing mechanisms and two lower fixing mechanisms. The upper fixing mechanism is installed at the upper corners of the adjacent connecting end faces of the beam bridges, and includes a first folding plate, a first rib plate, a first clamping rod and a second clamping rod. The folding angle of the first folding plate is a right angle. The first rib plate is fixedly connected to the inner side of the folding angle of the first folding plate. Two through holes are longitudinally provided on the upper surface of the first folding plate. The centers of the first clamping rod and the second clamping rod are respectively provided with threaded holes, which are respectively clamped downward by two high-strength bolts. The first clamping rod and the second clamping rod are threadedly connected after passing through the two through holes; the lower fixing mechanism is installed at the lower corner of the adjacent beam bridge connection end surface, and includes a second folding plate, a second rib plate and a third clamping rod. The folding angle of the second folding plate is an obtuse angle, and the second rib plate is fixedly connected to the inner side of the folding angle of the second folding plate. A through hole that passes through the lower surface of the second folding plate is provided on the longitudinal direction of the second rib plate. A threaded hole is provided in the center of the third clamping rod, and the third clamping rod is threadedly connected after passing through the through hole with a high-strength bolt; the two ends of the first clamping rod, the second clamping rod and the third clamping rod are respectively located in the two adjacent beam bridges.

[0020] The present invention provides an assembled steel-concrete composite structure beam bridge, which has the following beneficial effects:

[0021] 1. The present invention provides an assembled steel-concrete composite structure beam bridge, which can improve the connection efficiency of existing beam bridges, replace the operation steps that can only be connected by pouring, reduce the prefabrication time of the beam bridge, and save the time waiting for the connection concrete to solidify;

[0022] 2. The present invention provides an assembled steel-concrete composite structure beam bridge, which can support the steel frame plate by arranging steel beams and brackets, thereby increasing the contact area between the concrete top plate and the concrete bottom plate.

[0023] The present invention also provides an assembly method for an assembled steel-concrete composite structure beam bridge and a fixing device for connecting beams and bridges. The beneficial effects thereof are similar to those of the assembled steel-concrete composite structure beam bridge, and details thereof will not be repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the cross-sectional structure of an assembled steel-concrete composite beam bridge provided by an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the CC section;

[0026] Figure 3 A schematic diagram of the overall structure of the steel frame plate of the assembled steel-concrete composite structure beam bridge provided by an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the overall structure of the steel beams of the assembled steel-concrete composite structure beam bridge provided by an embodiment of the present invention;

[0028] Figure 5 for Figure 1 Schematic diagram of the local enlarged structure at A in the middle;

[0029] Figure 6 for Figure 1 Schematic diagram of the local enlarged structure at B in the middle;

[0030] Figure 7 A schematic diagram of the overall structure of the fixing device for connecting beams and bridges provided by an embodiment of the present invention when in use;

[0031] Figure 8 This is a schematic diagram of the overall structure of a fixing device for connecting beams and bridges provided by an embodiment of the present invention when installed on one side;

[0032] Figure 9 This is a schematic diagram of the overall structure of a fixing device for connecting beams and bridges provided in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Concrete top plate; 2. Concrete bottom plate; 3. Steel frame plate; 4. Extension; 5. Steel beam; 6. Bracket; 7. Vertical plate; 8. Steel plate; 9. Threaded assembly; 10. Angle plate; 11. Load-bearing groove; 12. Damping plate; 13. Steel cable; 14. Upper fixing mechanism; 15. Lower fixing mechanism; 16. First folding plate; 17. First rib; 18. First clamping rod; 19. Second clamping rod; 20. Third clamping rod; 21. High-strength bolt; 22. Second folding plate; 23. Second rib. Implementation Method

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0036] The following references Figure 1-6 For details on specific situations, please refer to Figure 1 , Figure 1Schematic diagram of the cross-sectional structure of an assembled steel-concrete composite structure beam bridge provided by an embodiment of the present invention; the present invention provides an assembled steel-concrete composite structure beam bridge, comprising a concrete top plate 1, a concrete bottom plate 2 and a steel frame plate 3, wherein there are two steel frame plates 3, and the inner upper ends of the two steel frame plates 3 are respectively detachably connected to the two sides of the concrete top plate 1, and the inner lower ends are respectively detachably connected to the two sides of the concrete bottom plate 2, and the upper and lower ends of the inner sides of the steel frame plates 3 are both provided with connecting mechanisms, and the connecting mechanisms are used to be detachably connected to the concrete top plate 1 or the concrete bottom plate 2.

[0037] Please refer to Figure 3 , Figure 3 Schematic diagram of the overall structure of the steel frame plate 3 of the assembled steel-concrete composite structure beam bridge provided by an embodiment of the present invention; in the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred embodiment, the connecting mechanism includes two extensions 4 extending toward the inner side of the steel frame plate 3, and the two extensions 4 are parallel to the concrete top plate 1 and the concrete bottom plate 2, and a long strip-shaped mounting groove is formed between the extensions 4, and the two sides of the concrete top plate 1 and the concrete bottom plate 2 are respectively connected to the mounting grooves of the steel frame plates 3 on both sides.

[0038] Steel frame plates 3 are provided on both sides of the concrete top plate 1 and the concrete bottom plate 2, and an extension part 4 is provided on the inner side of the steel frame plate 3. Both sides of the concrete top plate 1 and the concrete bottom plate 2 extend to the inner side of the extension part 4 and are plugged into the extension part 4. The concrete top plate 1 and the concrete bottom plate 2 are connected to the steel frame plate 3 through a connecting mechanism.

[0039] Please refer to Figure 2 In the above-mentioned assembled steel-concrete composite structure beam bridge, as a preferred solution, a steel beam 5 is respectively provided below the concrete top plate 1 and above the concrete bottom plate 2, and both ends of the steel beam 5 are respectively installed on the connecting mechanisms on both sides, and the two steel beams 5 are connected by a bracket 6;

[0040] Please refer to Figure 4 , Figure 4This is a schematic diagram of the overall structure of the steel beam 5 of the assembled steel-concrete composite structure beam bridge provided by an embodiment of the present invention; the two steel beams 5 are connected by two brackets 6, and the two steel beams 5 and the two brackets 6 form an "I"-shaped structure. A vertical plate 7 is fixedly provided in the internal space enclosed by the two steel beams 5 and the two brackets 6. The inner side of the steel frame plate 3 is provided with a steel beam 5 located between the concrete top plate 1 and the concrete bottom plate 2. The inner side of the steel beam 5 is fixedly connected to the bracket 6. Both ends of the steel beam 5 extend to the interior of the extension part 4 and are plugged into the extension part 4. The two sides of the steel beam 5 are fixedly connected to the vertical plate 7. The side of the vertical plate 7 away from the steel beam 5 is fixedly connected to the surface of the bracket 6. By providing the steel beam 5 and the bracket 6, the steel frame plate 3 can be supported and the contact area between the concrete top plate 1 and the concrete bottom plate 2 can be increased.

[0041] In the aforementioned assembled steel-concrete composite beam bridge, as a preferred embodiment, a steel plate 8 is provided beneath the concrete base plate 2, with its ends mounted to the connecting mechanisms on either side. The steel plate 8 is provided at the bottom of the concrete base plate 2, and the bottom of the steel frame plate 3 is fixedly connected to the top of the steel plate 8. The provision of the steel plate 8 connects the two steel frame plates 3, facilitating the distribution of the weight borne by the steel frame plates 3.

[0042] In the aforementioned assembled steel-concrete composite structural beam bridge, as a preferred embodiment, the connection mechanism further includes a bolt assembly, and the concrete top plate 1, the concrete bottom plate 2, the steel beam 5, and the steel plate 8 are all detachably connected to the corresponding extension portion 4 via a threaded assembly 9. The provision of the threaded assembly 9 improves the stability of the structural connection and facilitates splicing during construction or assembly. The bolt assembly includes a set of bolts and nuts, and the strength grade of the bolts is not less than 8.8.

[0043] Please refer to Figure 6 In the aforementioned assembled steel-concrete composite structure beam bridge, as a preferred embodiment, a gusset 10 is fixedly installed on the inner side of the steel frame plate 3. One side of the gusset 10 is fixedly connected to the inner surface of the extension portion 4. A load-bearing groove 11 is defined in the center of the gusset 10. Both the gusset 10 and the load-bearing groove 11 have triangular cross-sectional shapes. The provision of the gusset 10 and the load-bearing groove 11 utilizes the stability of the triangle to improve the strength of the steel frame plate 3 and prevent bending deformation in the middle of the steel frame plate 3.

[0044] Please refer to Figure 5 and Figure 6In the aforementioned assembled steel-concrete composite structure beam bridge, as a preferred embodiment, damping plates 12 are installed in the gaps between the concrete top plate 1 and the steel beam 5, between the concrete bottom plate 2 and the steel beam 5, and between the concrete bottom plate 2 and the steel plate 8. These damping plates 12 are located between the end faces of the extensions 4 corresponding to the steel frame plates 3 on both sides. The outer surfaces of the damping plates 12 contact the surfaces of the concrete top plate 1, steel beam 5, concrete bottom plate 2, and steel plate 8, respectively. The provision of the damping plates 12 can reduce the impact of vibration on structural stability and cushion impact forces.

[0045] In the aforementioned assembled steel-concrete composite structure beam bridge, as a preferred embodiment, the assembled steel-concrete composite structure beam bridge further includes a steel cable 13. Both ends of the steel cable 13 penetrate the steel beam 5, the vertical plate 7, the damping plate 12, the concrete base plate 2, and the steel plate 8, and are closed at the bottom of the steel plate 8. The provision of the steel cable 13 can support the concrete base plate 2, reducing the weight that needs to be borne by the middle portion of the concrete base plate 2.

[0046] The working principle and use process of the assembled steel-concrete composite structure beam bridge of the present invention are as follows:

[0047] When in use, first set the two steel frame plates 3 relative to each other, and then slide the concrete top plate 1 between the two steel frame plates 3 through the extension part 4. When the concrete top plate 1 is installed, use the extension part 4 to plug the steel beam 5, and then use the threaded component 9 to connect the steel beam 5, the steel frame plate 3 and the concrete top plate 1. When the threaded component 9 is assembled, hoist the concrete top plate 1 so that the steel frame plate 3 rises with it, and then synchronously plug the concrete bottom plate 2 into the inner side of the steel frame plate 3 and use the threaded component 9 to connect the concrete bottom plate 2, the steel frame plate 3 and the steel plate 8 again, thereby completing the splicing and assembly of the beam bridge. Finally, a steel cable 13 is set through between the steel beam 5, the concrete bottom plate 2 and the steel plate 8, and the tension of the steel cable 13 effectively supports the suspended part of the concrete bottom plate 2.

[0048] The present invention also provides an assembly method for an assembled steel-concrete composite structure beam bridge, comprising the following steps:

[0049] S1: Arrange two steel frame plates 3 opposite to each other, and then insert the two sides of the concrete top plate 1 between the two steel frame plates 3 through the upper extension parts 4; after the concrete top plate 1 is installed, insert the two sides of the steel beam 5 between the two steel frame plates 3 through the upper extension parts 4; connect the steel beam 5, the upper extension parts 4 of the steel frame plates 3 and the concrete top plate 1 through the screw components 9;

[0050] S2: Hoist the concrete top plate 1, so that the steel frame plate 3 rises with it, insert the two sides of the concrete bottom plate 2 between the two steel frame plates 3 through the extension parts 4 below, and use the screw components 9 again to connect the concrete bottom plate 2, the extension parts 4 below the steel frame plate 3 and the steel plate 8, thereby completing the splicing and assembly of the beam bridge;

[0051] S3: A steel cable 13 is installed between the steel beam 5, the concrete bottom plate 2 and the steel frame, and the tension of the steel cable 13 effectively supports the suspended part of the concrete bottom plate 2.

[0052] In summary, the assembled steel-concrete composite structure beam bridge and assembly method can improve the connection efficiency of existing beam bridges, replace the operation steps that can only be connected by pouring, reduce the prefabrication time of the beam bridge, and save the time waiting for the connection concrete to solidify.

[0053] Please refer to Figure 7 、 Figure 8 and Figure 9 The present invention also provides a fixing device for connecting beam bridges, which is used to fix the adjacent end faces of two adjacent beam bridges, including two upper fixing mechanisms 14 and two lower fixing mechanisms 15. The upper fixing mechanism 14 is installed at the upper corner of the connecting end faces of the adjacent beam bridges, and includes a first folding plate 16, a first rib 17, a first clamping rod 18 and a second clamping rod 19. The folding angle of the first folding plate 16 is a right angle. The first rib 17 is fixedly connected to the inner side of the folding angle of the first folding plate 16. Two through holes are longitudinally provided on the first rib 17, which penetrate the upper surface of the first folding plate 16. The centers of the first clamping rod 18 and the second clamping rod 19 are respectively provided with threaded holes, which are respectively passed through downward by two high-strength bolts 21. The first clamping rod 18 and the second clamping rod 19 are threadedly connected after the two through holes; the lower fixing mechanism 15 is installed at the lower corner of the adjacent beam bridge connection end surface, including a second folding plate 22, a second rib 23 and a third clamping rod 20, the folding angle of the second folding plate 22 is an obtuse angle, the second rib 23 is fixedly connected to the inner side of the folding angle of the second folding plate 22, and a through hole is longitudinally opened on the second rib 23 and passes through the lower surface of the second folding plate 22. A threaded hole is opened in the center of the third clamping rod 20, and the third clamping rod 20 is threadedly connected after a high-strength bolt 21 passes through the through hole upward; the two ends of the first clamping rod 18, the second clamping rod 19 and the third clamping rod 20 are respectively located in the two adjacent beam bridges. When the high-strength bolts are tightened, the upper surfaces of the first clamping rod 18 contact the lower surface of the second extension 4 above the two adjacent bridge beams. The upper surfaces of the second clamping rod 19 contact the lower surface of the steel beam 5 above the two adjacent bridge beams. The lower surface of the third clamping rod 20 contacts the upper surface of the third extension 4 below the two adjacent bridge beams. The high-strength bolts have a strength grade of 10.9 and are nitrided.

[0054] During installation and use, the inner surfaces of the first folding plate 16 and the second folding plate 22 respectively contact the outer sides of the upper and lower corners of the corresponding steel frame plate 3 and match the outer contour surfaces of the corners of the steel frame plate 3 .

[0055] The above is a detailed introduction to the specific implementation methods provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. An assembled steel-concrete composite structure beam bridge, characterized in that: It includes a concrete top plate, a concrete bottom plate and a steel frame plate, wherein there are two steel frame plates, the inner upper ends of the two steel frame plates are detachably connected to the two sides of the concrete top plate, and the inner lower ends are detachably connected to the two sides of the concrete bottom plate, and the upper and lower ends of the inner sides of the steel frame plates are both provided with connecting mechanisms, and the connecting mechanisms are used to be detachably connected to the concrete top plate or the concrete bottom plate; The connecting mechanism includes two extensions extending toward the inner side of the steel frame plate, the two extensions are parallel to the concrete top plate and the concrete bottom plate, and a long strip mounting groove is formed between the extensions, and the two sides of the concrete top plate and the concrete bottom plate are respectively connected to the mounting grooves of the steel frame plates on both sides; Steel beams are respectively provided below the concrete top plate and above the concrete bottom plate, and both ends of the steel beams are respectively installed on the connecting mechanisms on both sides, and the two steel beams are connected by brackets; the two steel beams are connected by two brackets, and the two steel beams and the two brackets form an "I"-shaped structure, and a vertical plate is fixedly provided in the internal space enclosed by the two steel beams and the two brackets.

2. The assembled steel-concrete composite structure beam bridge according to claim 1 is characterized in that: A steel plate is provided below the concrete bottom plate, and both ends of the steel plate are respectively mounted on the connecting mechanisms on both sides.

3. The assembled steel-concrete composite structure beam bridge according to claim 2 is characterized in that: The connecting mechanism further comprises a bolt assembly, and the concrete top plate, the concrete bottom plate, the steel beam and the steel plate are all detachably connected to the corresponding extension parts via the bolt assembly.

4. The assembled steel-concrete composite structure beam bridge according to claim 1, characterized in that: A corner plate is fixedly provided on the inner side of the steel frame plate, one side of the corner plate is fixedly connected to the surface of the inner extension portion, a load-bearing groove is opened in the center of the corner plate, and the cross-sectional shapes of the corner plate and the load-bearing groove are both triangular.

5. The assembled steel-concrete composite structure beam bridge according to claim 2 is characterized in that: Damping plates are provided in the gaps between the concrete top plate and the steel beam, between the concrete bottom plate and the steel beam, and between the concrete bottom plate and the steel plate, and the damping plates are located between the end faces of the extension portions corresponding to the steel frame plates on both sides.

6. The assembled steel-concrete composite structure beam bridge according to claim 5, characterized in that: The assembled steel-concrete composite structure beam bridge also includes a steel cable, both ends of which pass through the steel beam, vertical plate, damping plate, concrete bottom plate and steel plate, and are closed and connected at the bottom of the steel plate.

7. An assembling method for an assembled steel-concrete composite structure beam bridge according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Place two steel frame plates opposite to each other, then insert both sides of the concrete top plate between the two steel frame plates through the upper extensions. After the concrete top plate is installed, insert both sides of the steel beam between the two steel frame plates through the upper extensions. Connect the steel beam, the upper extensions of the steel frame plates, and the concrete top plate with bolt assemblies. S2: Hoist the concrete top plate, allowing the steel frame plate to rise with it. Insert the two sides of the concrete bottom plate between the two steel frame plates through the lower extensions. Use the bolt assembly again to connect the concrete bottom plate, the lower extensions of the steel frame plate, and the steel plate, thus completing the splicing and assembly of the beam bridge. S3: Steel cables are installed between the steel beam, concrete base plate and steel plate to support the suspended part of the concrete base plate through the tension of the steel cables.

8. A fixing device for connecting beams and bridges, characterized in that: The invention relates to a method for fixing two adjacent end faces of an assembled steel-concrete composite structure beam bridge as described in any one of claims 1 to 6, comprising two upper fixing mechanisms and two lower fixing mechanisms, wherein the upper fixing mechanism is installed at the upper corner of the connecting end faces of the adjacent beam bridges, and comprises a first folding plate, a first rib plate, a first clamping rod and a second clamping rod, the folding angle of the first folding plate is a right angle, the first rib plate is fixedly connected to the inner side of the folding angle of the first folding plate, the first rib plate is provided with two through holes penetrating the upper surface of the first folding plate in the longitudinal direction, the first clamping rod and the second clamping rod are respectively provided with threaded holes in the centers, and two high-strength bolts are respectively passed downward through the first clamping rod and the second clamping rod. The first clamping rod and the second clamping rod are threadedly connected after passing through two through holes; the lower fixing mechanism is installed at the lower corner of the adjacent beam bridge connection end surface, and includes a second folding plate, a second rib plate and a third clamping rod. The folding angle of the second folding plate is an obtuse angle, and the second rib plate is fixedly connected to the inner side of the folding angle of the second folding plate. A through hole is provided on the longitudinal direction of the second rib plate, which passes through the lower surface of the second folding plate. A threaded hole is provided in the center of the third clamping rod, and the third clamping rod is threadedly connected after passing through the through hole with a high-strength bolt; the two ends of the first clamping rod, the second clamping rod and the third clamping rod are respectively located in the two adjacent beam bridges.

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