Empty cable-stayed bridge
The low-tower cable-stayed bridge, with its herringbone layout and composite beam design, solved the problems of complex urban terrain, high construction difficulty, and land resource occupation, achieving cost savings and improved structural stability.
Patent Information
- Application Number
- CN202423224338.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing low-tower cable-stayed bridges are difficult to construct in complex urban terrain and occupy a large amount of land resources, resulting in high construction costs.
The cable-stayed bridge design with a herringbone layout uses a combination of piers, towers, and stay cables in the left and right lines to distribute the load on the bridge deck, reduce the stress on the piers and towers, maximize the use of the terrain in a limited space, and enhance the structural stability by combining concrete and steel beams.
It effectively reduced construction difficulty, saved land resources, lowered construction costs, and improved the bridge's load-bearing capacity and structural stability, as well as its adaptability to complex terrain and environments, achieving efficient adaptation to terrain and environmental requirements and enabling flexible construction schemes.
Smart Images
Figure CN223620771U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cable-stayed bridges, and more specifically, to a low-tower cable-stayed bridge. Background Technology
[0002] In recent years, with the rapid development of bridge engineering construction, low-tower cable-stayed bridges, also known as partially cable-stayed bridges, have emerged as a novel bridge type. Their load-bearing performance falls between that of beam bridges and cable-stayed bridges. Combining the advantages of cable-stayed bridges and continuous beam bridges, low-tower cable-stayed bridges have a lower tower height and have become a preferred choice for bridges with spans of 200 to 300 meters. In related technical solutions, low-tower cable-stayed bridges include a main girder, multiple towers, and multiple cables. The towers are arranged along the extension direction of the main girder and include piers and two tower legs mounted on the piers. The two tower legs are vertically mounted on the main piers and connected by cross braces. The main girder is mounted on the piers via supports, or the main girder, tower legs, and piers are directly fixedly connected. However, due to the complex terrain within cities, the construction of existing bridges may require crossing multiple bridges, resulting in significant construction difficulties and requiring substantial land resources for rerouting. How to address these issues has become a pressing problem for those skilled in the art. Utility Model Content
[0003] To overcome the above shortcomings, this utility model provides a low-tower cable-stayed bridge, which aims to improve the problems of complex urban terrain, existing bridge construction may require crossing multiple bridges, which is difficult to construct, and the rerouting requires a large amount of land resources.
[0004] This utility model is implemented as follows: A low-tower cable-stayed bridge includes a main beam body, piers, towers, and stay cables. The main beam body is provided with a bridge deck for trains to pass through, as well as a left-line structure and a right-line structure. The left-line structure and the right-line structure are arranged in a V-shape. The piers are fixedly installed at the bottom ends of the left-line structure and the right-line structure. The towers are installed at one end of the left-line structure and the right-line structure and are used to support the left-line structure and the right-line structure. The stay cables are arranged at the upper end of the bridge deck and are used to connect the bridge deck and the towers.
[0005] In some specific implementation schemes, the front end of the fork between the left and right line structures, as well as the left and right line structures, are supported by the same set of piers. The rear end of the fork between the left and right line structures, as well as the bottom end of the left and right line structures, are provided with multiple sets of piers, and these multiple sets of piers are used to support the left and right line structures.
[0006] In some specific implementations, the bridge tower includes a main pier and tower legs. The main pier is fixedly connected to the left line structure and the right line structure. Two sets of tower legs are provided, and the two sets of tower legs are fixedly installed on both sides of the main pier. A gap is provided between the two sets of tower legs for the left line structure and the right line structure to pass through. The stay cables connect the bridge deck and the tower legs.
[0007] In some specific implementations, two sets of tower legs are vertically arranged on the upper end face of the main pier, and the tower legs are provided with multiple sets of through holes, which are evenly distributed vertically along the tower legs.
[0008] In some specific implementations, a boss is provided on the inner side of the tower limb, one end of the stay cable passes through the through hole and is anchored to the boss, and the other end of the stay cable is anchored to the bridge deck.
[0009] In some specific implementation schemes, the bottom of the main beam body adopts a quadratic parabola design. The height-changing section of the bottom of the main beam body is 54m long, the height-medium section of the bottom of the main beam body is 35m long, and the height-equivalent section of the bottom of the main beam body at the mid-support point is 5m long. The quadratic parabola design can effectively enhance the load-bearing capacity and structural stability, reduce the possibility of beam deformation under load, and improve seismic performance.
[0010] In some specific implementation schemes, the main girder body segment within 11m-13m of the support is made of concrete box girder, while the remaining segments of the main girder body are made of corrugated steel web box girder. The length of the cable-free zone at the support of the main girder body segment is 45.6m, the length of the cable-free zone at the mid-span of the main girder body segment is 25.6m, the 12.8m corrugated steel web segment near the mid-support and the 4m corrugated steel web segment near the side support of the main girder body segment, as well as the 1.6m and 3.2m corrugated steel web segments near the pier of the main girder body segment are made of box girder inner lining concrete, and the inner lining concrete is connected to the corrugated steel web by studs.
[0011] In some specific implementation schemes, the top of the bridge tower is 19-21m from the top surface of the main beam. The bridge tower is made of reinforced concrete and has a height of 23m above the horizontal plane of the beam. The lowest point of the bridge tower cable-beam anchorage is 16.4m from the top surface of the main beam. The vertical spacing of the bridge tower cable-beam anchorage points is 1.2m. Each bridge tower column has a solid rectangular cross-section with a longitudinal length of 3m and a transverse width of 2m. The transverse spacing of the bridge tower columns is 5m. To improve the tensile stress at the root of the curved beam main tower under the action of cable force, the bridge tower cable-beam anchorage points are eccentrically 0.2m outward from the curve.
[0012] The beneficial effects of this utility model are as follows: The low-tower cable-stayed bridge designed in this utility model, during construction, involves casting the piers and towers, prefabricating the main beam body, constructing the transition section between the first and second towers to form the left-line structure, constructing the transition section between the first and third towers to form the right-line structure, installing the stay cables, casting the side span sections, and constructing the closure section. The side span closure section is cast first, followed by the middle span closure section. Prestressing tension tests are conducted, and the bridge deck is paved. The herringbone layout effectively distributes the load on the bridge deck, especially in heavy traffic or when bearing heavy train loads, effectively reducing the stress on the piers and towers. Simultaneously, within limited ground space, the herringbone layout maximizes space utilization, allowing the bridge to adapt more flexibly to terrain and environmental constraints. This low-tower cable-stayed bridge, by using a herringbone-shaped left-line structure, solves the current problem of high construction difficulty, saves land resources, and thus reduces construction costs. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0014] Figure 1 This is a side view structural diagram of a low-tower cable-stayed bridge provided by an embodiment of this utility model;
[0015] Figure 2 Another side view of the structure provided for an embodiment of this utility model;
[0016] Figure 3 A side view structural schematic diagram of the tower limb is provided for the embodiment of this utility model;
[0017] Figure 4 This is a top view structural diagram of an embodiment of the present invention.
[0018] In the diagram: 1. Main beam body; 11. Left line structure; 12. Right line structure; 2. Pier; 3. Tower; 31. Main pier; 32. Tower leg; 321. Through hole; 322. Boss; 33. First tower; 34. Second tower; 35. Third tower; 4. Cable stays. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0020] Please see Figures 1-4 The present invention provides a technical solution: a low-tower cable-stayed bridge, comprising a main beam body 1, piers 2, towers 3, and stay cables 4. The main beam body 1 is provided with a bridge deck for trains to pass through, as well as a left-line structure 11 and a right-line structure 12. The left-line structure 11 and the right-line structure 12 are configured in a V-shape. The piers 2 are fixedly installed at the bottom ends of the left-line structure 11 and the right-line structure 12. The towers 3 are installed at one end of the left-line structure 11 and the right-line structure 12 and are used to support the left-line structure 11 and the right-line structure 12. The stay cables 4 are set at the upper end of the bridge deck and are used to connect the bridge deck and the towers 3.
[0021] In some specific implementation schemes, the front end of the fork between the left line structure 11 and the right line structure 12, as well as the left line structure 11 and the right line structure 12, are supported by the same set of piers 2. The rear end of the fork between the left line structure 11 and the right line structure 12, as well as the bottom end of the left line structure 11 and the right line structure 12, are provided with multiple sets of piers 2, and these multiple sets of piers 2 are suitable for supporting the left line structure 11 and the right line structure 12.
[0022] In some specific implementation schemes, the bridge tower 3 includes a main pier 31 and tower legs 32. The main pier 31 is fixedly connected to the left-line structure 11 and the right-line structure 12. Two sets of tower legs 32 are provided, and the two sets of tower legs 32 are fixedly set on both sides of the main pier 31. A gap is provided between the two sets of tower legs 32 for the left-line structure 11 and the right-line structure 12 to pass through. The stay cables 4 connect the bridge deck and the tower legs 32. The main beam is set along the extension direction of the low-tower cable-stayed bridge. The herringbone layout can effectively distribute the load on the bridge deck and effectively reduce the stress on the piers and towers. The arrangement of the piers 2, towers 3, and stay cables 4 enhances the support stability of the low-tower cable-stayed bridge. The bottom ends of the piers 2 and towers 3 are equipped with The bridge has a load-bearing platform with multiple sets of evenly distributed foundation piles at its bottom. Both the piers 2 and the towers 3 are fixedly connected to and supported by the load-bearing platform and the foundation piles. The towers 3 are a first tower 33, a second tower 34, and a third tower 35. The first tower 33 is located at the front end of the fork. The left line structure 11 and the right line structure 12 share a load-bearing platform, which is hexagonal. The second tower 34 and the third tower 35 are located at the rear end of the fork. The load-bearing platform at the bottom of the second tower 34 is fixedly connected to the left line structure 11, and the load-bearing platform at the bottom of the third tower 35 is fixedly connected to the right line structure 12. The load-bearing platforms at the bottom of the second tower 34 and the third tower 35 are both octagonal.
[0023] In some specific implementation schemes, two sets of tower legs 32 are vertically arranged on the upper end face of the main pier 31, and the tower legs 32 are provided with multiple sets of through holes 321, which are evenly distributed vertically along the tower legs 32.
[0024] In some specific implementation schemes, a boss 322 is provided on the inner side of the tower limb 32, one end of the stay cable 4 passes through the through hole 321 and is anchored on the boss 322, and the other end of the stay cable 4 is anchored to the bridge deck.
[0025] In some specific implementation schemes, the bottom of the main beam body 1 adopts a quadratic parabola design. The height-changing section of the bottom of the main beam body 1 is 54m long, the height-medium section of the bottom of the main beam body 1 is 35m long, and the height-equivalent section of the bottom of the main beam body 1 at the mid-support point is 5m long. The quadratic parabola design can effectively enhance the load-bearing capacity and structural stability, reduce the possibility of beam deformation under load, and improve seismic performance.
[0026] In some specific implementation schemes, the main girder body 1 segment uses a concrete box girder within the 11m-13m elevation range at the supports, while the remaining segments of the main girder body 1 use corrugated steel web box girders. The uncable-free zone at the supports of the main girder body 1 segment is 45.6m long, the uncable-free zone at the mid-span of the main girder body 1 segment is 25.6m long, and the 12.8m corrugated steel web segment near the mid-support and the 4m corrugated steel web segment near the side support of the main girder body 1 segment, as well as the 1.6m and 3.2m corrugated steel web segments near the piers of the main girder body 1 segment, are box girder inner lining concrete, and the inner lining concrete is connected to the corrugated steel web by studs.
[0027] In some specific implementation schemes, the top of bridge tower 3 is 19-21m from the top surface of the main beam body 1. Bridge tower 3 adopts a reinforced concrete structure and has a tower height of 23m above the horizontal plane of the beam. The lowest point of the cable-stayed anchorage of bridge tower 3 is 16.4m from the top surface of the main beam body 1. The vertical spacing of the cable-stayed anchorage points of bridge tower 3 is 1.2m. Each tower column of bridge tower 3 has a solid rectangular cross section with a longitudinal length of 3m and a transverse width of 2m. The transverse spacing of the tower columns of bridge tower 3 is 5m. In order to improve the tensile stress at the root of the main tower of the curved beam under the action of cable force, the cable-stayed anchorage point of bridge tower 3 is eccentrically 0.2m outward from the curve.
[0028] Working principle: During construction, the bridge piers 2 and towers 3 are cast in concrete, the main beam body 1 is precast, the transition section between the first tower 33 and the second tower 34 is constructed to form the left line structure 11, the transition section between the first tower 33 and the third tower 35 is constructed to form the right line structure 12, the stay cables 4 are installed, the side span cast-in-place section is cast in concrete, and the closure section is constructed by first casting the side span closure section and then casting the middle span closure section. Prestressing tension tests should be carried out, and the bridge deck is paved. The herringbone layout can more effectively distribute the load on the bridge deck, especially in cases of heavy traffic or heavy train loads, which can effectively reduce the stress on the piers and towers. At the same time, in the limited ground space, the herringbone layout can maximize the use of space, allowing the bridge to adapt more flexibly to terrain and environmental constraints.
[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A low-tower cable-stayed bridge, characterized in that, The bridge includes a main girder body, piers, towers, and stay cables. The main girder body has a bridge deck for trains to pass through, as well as a left-line structure and a right-line structure. The left-line structure and the right-line structure are arranged in a V-shape. The piers are fixedly installed at the bottom of the left-line structure and the right-line structure. The towers are installed at one end of the left-line structure and the right-line structure and are used to support the left-line structure and the right-line structure. The stay cables are installed at the upper end of the bridge deck and are used to connect the bridge deck and the towers.
2. A low-tower cable-stayed bridge according to claim 1, characterized in that, The front end of the fork between the left and right lines, as well as the left and right lines themselves, are supported by the same set of piers. The rear end of the fork between the left and right lines, as well as the bottom end of the left and right lines, are each provided with multiple sets of piers, which are used to support the left and right lines.
3. A low-tower cable-stayed bridge according to claim 2, characterized in that, The bridge tower includes a main pier and tower legs. The main pier is fixedly connected to the left line structure and the right line structure. There are two sets of tower legs, which are fixedly installed on both sides of the main pier. A gap is provided between the two sets of tower legs to allow the left line structure and the right line structure to pass through. The stay cables connect the bridge deck and the tower legs.
4. A low-tower cable-stayed bridge according to claim 3, characterized in that, The two sets of tower legs are vertically arranged on the upper end face of the main pier. Each tower leg is provided with multiple sets of through holes, which are evenly distributed vertically along the tower leg.
5. A low-tower cable-stayed bridge according to claim 4, characterized in that, The inner side of the tower is provided with a boss, one end of the stay cable passes through the through hole and is anchored to the boss, and the other end of the stay cable is anchored to the bridge deck.
6. A low-tower cable-stayed bridge according to claim 1, characterized in that, The bottom of the main beam body is designed with a quadratic parabola.
7. A low-tower cable-stayed bridge according to claim 1, characterized in that, The main beam body segment uses concrete box girders in the 11m-13m section at the support point, while the remaining beam segments of the main beam body segment use corrugated steel web box girders.
8. A low-tower cable-stayed bridge according to claim 1, characterized in that, The top of the bridge tower is 19-21m from the top surface of the main beam.