Large-span combined cable-stayed bridge with string cables

Abstract

The large-span combined cable-stayed bridge comprises at least two cable-stayed bridge sections and a cable-free section located between the two adjacent cable-stayed bridge sections, and opposite stay cables on the inner sides of the adjacent cable-stayed bridge sections extend to the lower portion of a bridge body of the cable-free section to be connected into a whole to form the string cable. The string cables apply tensioning force through cable towers of the cable-stayed bridge sections on the two sides and convert the tensioning force into upward supporting force on a bridge body of the cable-free section, and meanwhile the cable-free section is provided with lower chord member prestressed steel beams arranged along lower chord members of a steel truss girder of the bridge body and diagonal web member prestressed steel beams arranged along diagonal web members of the steel truss girder. The steel truss girder which is light in self weight and high in spanning capacity is combined with the cable-stayed bridge, through the prestressed steel beams and the string cables which are connected with the bridge towers on the two sides and penetrate through the steel truss girder downwards, deflection deformation of the steel truss girder in the cable-free section is effectively limited, the rigidity of the main girder is increased, the height of the cable-stayed bridge is effectively reduced, and the spanning capacity of a traditional cable-stayed bridge is improved.

Description

Technical Field

[0001] The invention relates to the field of cable-stayed bridges, and in particular to a combined cable-stayed bridge. Background Art

[0002] Modern cable-stayed bridges are jointly stressed by towers, beams and cables. They have large span capacity and beautiful shape, and have become a common bridge type for super-large span bridges with a span of 400m to 1000m. At present, the world's largest span cable-stayed bridge is the Bosphorus Bridge in Russia, which has a main span of 1104m and an orthotropic plate steel box girder structure. However, with the increase in the span of cable-stayed bridges, the contradiction between the tower height, tower top displacement and the stiffness of the entire bridge has become increasingly serious, which has limited the span development of cable-stayed bridges.

[0003] Therefore, it is urgent to develop a large-span composite cable-stayed bridge with cable-stayed bridges, which combines steel trusses with light weight and strong spanning capacity with the cable-stayed bridge, and forms cable-stayed bridges by extending the innermost cables. The cable-stayed bridges are used to support the steel trusses in the mid-span, effectively increasing the spanning capacity of traditional cable-stayed bridges and reducing the contradiction between the tower height, tower top displacement and the stiffness of the entire bridge. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a large-span combined cable-stayed bridge with cable-stayed bridges, which combines steel trusses with light weight and strong spanning capacity with the cable-stayed bridge, and forms cable-stayed bridges by extending the innermost cables. This can effectively reduce the height of the cable-stayed bridge towers and increase the spanning capacity of traditional cable-stayed bridges.

[0005] A large-span combined cable-stayed bridge with tensioning cables of the present invention is characterized in that it comprises at least two cable-stayed bridge sections and a cable-free section located between two adjacent cable-stayed bridge sections, wherein the opposite cables on the inner sides of the adjacent cable-stayed bridge sections extend to the bottom of the bridge body of the cable-free section and are connected to form tensioning cables, and the tensioning cables apply tensioning force through the cable towers of the cable-stayed bridge sections on both sides, and convert the tensioning force into an upward supporting force for the bridge body of the cable-free section.

[0006] Furthermore, the cable-stayed cable is formed integrally by extending the innermost cable-stayed cable between adjacent cable-stayed cable sections, and includes a cable-stayed cable section and a cable-stayed cable section located in the cable-free section.

[0007] Furthermore, the tensioning force of the string is converted into an upward supporting force by a force conversion assembly, and the force conversion assembly includes a plurality of load-bearing brackets distributed between the string section and the cable-free section along the longitudinal height direction of the string section.

[0008] Furthermore, the force conversion assembly also includes a wire harness steering device arranged at the end of the load-bearing bracket, including a plurality of partitions with gradually offset holes and an outer frame fixed to the supporting end of the load-bearing bracket. The tensioning cable passes through the holes and completes the steering and transmits the upward supporting force under the action of the holes.

[0009] Furthermore, it also includes a restraining tube fixed to the bridge body for passing the tensioning cable.

[0010] Furthermore, the bridge body of the bridge is a steel truss, and the steel truss in the cable-free section is provided with a lower chord prestressed steel bundle arranged along the lower chord of the steel truss and a diagonal web prestressed steel bundle arranged along the diagonal web of the steel truss.

[0011] Furthermore, the lower chord of the steel truss girder in the cable-free section is arranged with a plurality of lower chord prestressed steel bundles of decreasing length, and the lower chord prestressed steel bundles convert the applied prestress into tensioning force applied to the steel truss girder in the cable-free section.

[0012] Furthermore, the lower chord prestressed steel bundle is also provided with a steel bundle restraining device for restraining the linear shape of the prestressed steel bundle and a steel bundle vibration damper for shortening the vibration of the prestressed steel bundle.

[0013] Furthermore, the prestressed steel bundle of the lower chord and the prestressed steel bundle of the diagonal web are fixed on the steel truss girder in the cable-free section by means of steel bundle anchoring devices arranged at both ends of the steel bundle.

[0014] The beneficial effects of the present invention are as follows: a large-span combined cable-stayed bridge with cable-stayed bridge of the present invention combines a steel truss with light weight and strong spanning capacity with the cable-stayed bridge, and extends the cable-stayed cables on both sides of the middle span of the cable-stayed bridge to form a cable-stayed cable connecting the bridge towers on both sides and passing under the steel truss, which effectively limits the deflection and deformation of the steel truss in the cable-free section and increases the stiffness of the main beam. At the same time, the stiffness of the steel truss in the cable-free section and the cable-stayed section in the mid-span is controlled by tensioning the anchor cables at the end of the side span, so that the two sections are combined to bear force synergistically, effectively reducing the tower height of the cable-stayed bridge and increasing the spanning capacity of the cable-stayed bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 It is an overall schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of A of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of B of the present invention;

[0020] Figure 5It is a schematic diagram of the structure at C of the present invention. DETAILED DESCRIPTION

[0021] It should be noted that, in the description of this specification, the terms "upper", "lower", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Figure 1 It is an overall schematic diagram of the present invention, Figure 2 It is a structural schematic diagram of the present invention, Figure 3 It is a schematic diagram of the structure of A of the present invention, Figure 4 It is a schematic diagram of the structure at B of the present invention, Figure 5 The schematic diagram of the structure at C of the present invention is shown in the figure: a large-span combined cable-stayed bridge with cable-stayed bridges of the present embodiment comprises at least two cable-stayed bridge sections and a cable-free section between two adjacent cable-stayed bridge sections, the opposite cables on the inner sides of the adjacent cable-stayed bridge sections respectively extend to the bottom of the bridge body of the cable-free section to form a cable-stayed bridge 1, the cable-stayed bridge 1 applies tensioning force through the cable towers of the cable-stayed bridge sections on both sides, and converts the tensioning force into an upward supporting force for the bridge body of the cable-free section; as shown in the figure, a cable-free section is arranged between two adjacent cable-stayed bridge sections, and the opposite cables on the inner sides of the adjacent cable-stayed bridge sections extend to a position below the cable-free section. The cable-stayed bridge body forms a tensioning cable 1, that is, the cable-stayed bridge body 1 arranged near the two ends of the cable-free section is formed by extending a cable that runs through the cable-free section and connects the adjacent cable-stayed bridge section. At the same time, the two ends of the cable-stayed bridge body 1 are fixed on the cable towers on both sides, and tensioning force is applied to the cable-stayed bridge body 1 through the cable towers, and the tensioning force is used to make the cable-stayed bridge work, and the cable-stayed bridge body 1 can further convert the tensioning force into an upward supporting force for the cable-free section through a force conversion component to meet the force requirement of the cable-free section. At the same time, in order to control the longitudinal deformation of the cable tower, an end anchor cable is arranged near the side span, and the stiffness of the steel truss beams of the cable-free section and the cable-stayed section in the mid-span is controlled by tensioning the end anchor cables of the side span, so that the two sections are combined and subjected to force synergistically.

[0023] In this embodiment, the cable-stayed cable 1 is formed by extending the innermost cable between adjacent cable-stayed cable sections, and includes a cable-stayed cable section 1B and a cable-stayed cable section 1A located in a cable-free section; as shown in the figure, the cable-stayed cable 1 is formed by an extended cable-stayed cable, that is, a cable-stayed cable is extended and connected to two adjacent cable towers to form the cable-stayed cable 1, and includes a cable-stayed cable section 1B and a cable-stayed cable section 1A located in a cable-free section, and the cable-stayed cable section 1A is located below the cable-free section.

[0024] In this embodiment, the tensioning cable 1 converts the tensioning force into an upward supporting force through a force conversion assembly, and the force conversion assembly includes a plurality of load-bearing brackets 2 distributed between the tensioning cable segment 1A and the cable-free section along the longitudinal height direction of the tensioning cable segment 1A; as shown in the figure, the force conversion assembly is suspended between the tensioning cable segment 1A and the cable-free section, and includes a plurality of load-bearing brackets 2 whose lengths match the arc-shaped contour of the tensioning cable segment 1A, and the tensioning cable segment 1A converts the tensioning force into an upward supporting force through the load-bearing brackets 2 of the force conversion assembly.

[0025] In this embodiment, the force conversion assembly also includes a harness steering device 8 arranged at the end of the load-bearing bracket 2, including a plurality of partitions 11 with gradually offset holes and an outer frame 10 fixed to the support end of the load-bearing bracket 2. The tensioning cable 1 passes through the holes and completes the steering and transmits the upward supporting force under the action of the holes; as shown in the figure, the force conversion assembly also includes a harness steering device 8 arranged at the end of the load-bearing bracket 2, and the harness steering device is composed of a plurality of partitions 11 with gradually offset holes and an outer frame 10. The tensioning cable 1 completes the steering and converts the tensioning force into an upward supporting force under the action of the holes, effectively converting and transmitting the tensioning force of the tensioning cable 1 to the cable-free section, thereby meeting the force requirements of the cable-free section.

[0026] In this embodiment, it also includes a restraining tube 9 fixed to the bridge body for passing the cable-string 1; as shown in the figure, the restraining tube 9 is arranged at both ends of the cable-free section to restrain the cable-string 1, reduce the vibration and swing of the cable-string 1, and improve the stability of the cable-free section.

[0027] In the present embodiment, the bridge body of the bridge is a steel truss, and the steel truss in the cable-free section is provided with a lower chord prestressed steel bundle 6 arranged along the lower chord of the steel truss and a diagonal web prestressed steel bundle 3 arranged along the diagonal web of the steel truss; as shown in the figure, the bridge body adopts a steel truss, and a lower chord prestressed steel bundle 6 is arranged on the lower chord of the steel truss in the cable-free section, and a diagonal web prestressed steel bundle 3 is arranged on the diagonal web. The prestressed steel bundle can improve the strength of the steel truss in the cable-free section, and effectively solves the problem of increased span in the middle span of the cable-stayed bridge and decreased stiffness of the entire bridge.

[0028] In this embodiment, the lower chord of the steel truss girder in the cable-free section is arranged with a plurality of lower chord prestressed steel bundles 6 of decreasing length, and the lower chord prestressed steel bundles 6 convert the applied prestress into a tensioning force applied to the steel truss girder in the cable-free section; as shown in the figure, the lower chord of the steel truss girder in the cable-free section is arranged with a plurality of lower chord prestressed steel bundles 6 of decreasing length, and the centers of these lower chord prestressed steel bundles 6 correspond to the center of the cable-free section, and the prestressed steel bundles can improve the strength of the steel truss girder in the cable-free section.

[0029] In this embodiment, the lower chord prestressed steel bundle 6 is also provided with a steel bundle constraint device 5 for constraining the linear shape of the prestressed steel bundle and a steel bundle vibration damper 7 for shortening the vibration of the prestressed steel bundle; as shown in the figure, the steel bundle constraint device 5 and the steel bundle constraint device 7 are both arranged on the lower chord prestressed steel bundle 6, which are used to constrain and reduce the vibration of the steel bundle and improve the stability of the cable-free section.

[0030] In this embodiment, the lower chord prestressed steel bundle 6 and the diagonal web prestressed steel bundle 3 are fixed to the steel truss girder in the cable-free section by means of steel bundle anchoring devices 4 arranged at both ends of the steel bundles; as shown in the figure, the lower chord prestressed steel bundle 6 and the diagonal web prestressed steel bundle 3 are fixed to the steel truss girder by means of the steel bundle anchoring devices 4 at both ends and prestress is applied.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A large-span combined cable-stayed bridge with cable-stayed cables, characterized in that: The invention comprises at least two cable-stayed bridge sections and a cable-free section between two adjacent cable-stayed bridge sections, wherein the opposite inner cables of the adjacent cable-stayed bridge sections extend to the bottom of the bridge body of the cable-free section and are connected to form a tensioning cable, and the tensioning cable applies tensioning force through the cable towers of the cable-stayed bridge sections on both sides, and converts the tensioning force into an upward supporting force for the bridge body of the cable-free section.

2. A large-span combined cable-stayed bridge with cable-stayed cables according to claim 1, characterized in that: The cable-stayed cable is formed by extending the innermost cable between adjacent cable-stayed cable sections, and comprises a cable-stayed cable section and a cable-stayed cable section located in a cable-free section.

3. The large-span combined cable-stayed bridge with cable-stayed cables according to claim 2, characterized in that: The tensioning cable converts the tensioning force into an upward supporting force through a force conversion assembly, and the force conversion assembly includes a plurality of load-bearing brackets distributed between the tensioning cable segment and the cable-free section along the longitudinal height direction of the tensioning cable segment.

4. The large-span combined cable-stayed bridge with cable-stayed cables according to claim 3, characterized in that: The force conversion assembly also includes a harness steering device arranged at the end of the load-bearing bracket, including a plurality of partitions with gradually offset holes and an outer frame fixed to the supporting end of the load-bearing bracket. The tensioning cable passes through the holes and completes the steering and transmits the upward supporting force under the action of the holes.

5. The large-span combined cable-stayed bridge with cable-stayed cables according to claim 1, characterized in that: The invention also comprises a restraining tube fixed to the bridge body for passing the tensioning cable.

6. The large-span combined cable-stayed bridge with cable-stayed cables according to claim 5, characterized in that: The bridge body of the bridge is a steel truss, and the steel truss in the cable-free section is provided with a lower chord prestressed steel bundle arranged along the lower chord of the steel truss and a diagonal web prestressed steel bundle arranged along the diagonal web of the steel truss.

7. The large-span combined cable-stayed bridge with cable-stayed cables according to claim 6, characterized in that: The lower chord of the steel truss girder in the cable-free section is arranged with a plurality of lower chord prestressed steel strands with decreasing lengths, and the lower chord prestressed steel strands convert the applied prestress into tensioning force applied to the steel truss girder in the cable-free section.

8. The large-span combined cable-stayed bridge with cable-stayed cables according to claim 7, characterized in that: The lower chord prestressed steel bundle is also provided with a steel bundle restraining device for restraining the linear shape of the prestressed steel bundle and a steel bundle vibration damper for shortening the vibration of the prestressed steel bundle.

9. The large-span combined cable-stayed bridge with cable-stayed cables according to claim 6, characterized in that: The lower chord prestressed steel bundle and the diagonal web prestressed steel bundle are fixed on the cable-free section steel truss through steel bundle anchoring devices arranged at both ends of the steel bundle.

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