A cable-stayed bridge structure with multiple high-low tower rigid frame system

Abstract

The present invention provides a multi-tower high-low tower rigid frame system cable-stayed bridge structure, comprising a main beam, bridge piers, bridge towers, and a plurality of inclined cables anchored on the bridge towers and the main beam at both ends, the bridge piers comprising low piers arranged on both sides along the bridge direction and fixed to the main beam, and high piers arranged in the middle along the bridge direction and fixed to the main beam; the bridge towers comprising side towers and middle towers, the bottom of the side towers being fixed to the main beam at the corresponding position of the low piers, the bottom of the middle towers being fixed to the main beam at the corresponding position of the high piers, and the tower height above the bridge deck of the middle tower being greater than the tower height above the bridge deck of the side towers. The cable-stayed bridge structure adopts a bridge design scheme combining high-low towers with high-low piers, and the combination of high piers and low piers not only solves the disadvantage of large terrain height difference, but also turns terrain disadvantages into advantages in bridge construction, reduces the side span length of the bridge, reduces the bridge length and the number of high piers, and reduces the engineering cost, and at the same time, combined with the staggered arrangement of high towers and low towers, the structure is more aesthetically pleasing.

Description

Technical Field

[0001] The invention belongs to the technical field of railway bridge engineering, and in particular relates to a cable-stayed bridge structure with a multi-tower high-low-tower rigid frame system. Background Art

[0002] Traditional railway cable-stayed bridges are mostly symmetrical towers of equal height, such as Figure 1 and Figure 2 As shown, its structural system can be divided into pier-beam separation and pier-beam consolidation, but this traditional bridge structure is mostly used in areas with small spans and spans and relatively flat terrain; and for the pier-beam separation system, large-tonnage bearings need to be set on the pier tops, which is expensive and extremely difficult to construct in high-pier bridges in mountainous areas; the pier-beam consolidation system avoids the installation and replacement of large-tonnage bearings, but the applicable span range is extremely limited.

[0003] However, when the terrain height difference between the two banks of the bridge site is large or there is a V-shaped canyon, especially when the height difference exceeds 100 meters, the use of traditional cable-stayed bridges will require increasing the span of the bridge or the number of high piers, resulting in a waste of investment and increased construction risks.

[0004] Therefore, in order to adapt to the engineering construction conditions of the large terrain height difference between the two banks and the V-shaped canyon, and to make the cable-stayed bridge structure still applicable and more economical, it is necessary to improve and optimize the traditional cable-stayed bridge. Summary of the invention

[0005] The object of the present invention is to provide a cable-stayed bridge structure with a multi-tower high-low-tower rigid frame system, which can at least solve some of the defects existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, an embodiment of the present invention provides the following technical solutions: a multi-tower high-low tower rigid frame system cable-stayed bridge structure, comprising a main beam, bridge piers, bridge towers and a plurality of inclined cables anchored at both ends on the bridge towers and the main beam, the bridge piers comprising low piers arranged on both sides along the bridge direction and fixed to the main beam, and high piers arranged in the middle along the bridge direction and fixed to the main beam; the bridge towers comprising side towers and middle towers, the bottom of the side towers being fixed to the main beam at the corresponding positions of the low piers, the bottom of the middle towers being fixed to the main beam at the corresponding positions of the high piers, and the tower height above the bridge deck of the middle towers being greater than the tower height above the bridge deck of the side towers.

[0007] Furthermore, the bridge tower is a double-column bridge tower, and the bridge tower is bifurcated into two independent tower columns at the junction of the pier, the main beam and the bridge tower.

[0008] Furthermore, the cross-section of the bridge tower along the bridge direction is arched, and the width of the widest part of the middle tower along the bridge direction is greater than the widest width of the side towers along the bridge direction, and the width of the middle tower and the side towers in the transverse direction of the bridge is consistent.

[0009] Furthermore, the high pier adopts a hollow pier with a rectangular cross-section, and the cross-sectional area of ​​the high pier parallel to the main beam gradually increases from top to bottom along the height direction.

[0010] Furthermore, the surface of the high pier is provided with a reinforced concrete convex decorative strip.

[0011] Furthermore, the low pier adopts a double-limb thin-wall pier.

[0012] Furthermore, the low pier includes a first low pier and a second low pier, the height of the first low pier is greater than the height of the second low pier, and the spacing between the lower parts of the double-limb thin walls of the first low pier is smaller than the spacing between the lower parts of the double-limb thin walls of the second low pier.

[0013] Furthermore, the cross section of the main beam is a box-type concrete cross section, and the bottom of the main beam is arranged in a circular curve or a parabola.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The multi-tower high-low tower rigid frame cable-stayed bridge structure provided by the present invention adopts a bridge design scheme combining high and low towers with high and low piers. The combination of high piers and low piers not only solves the disadvantage of large terrain height difference, but also turns the terrain disadvantage into an advantage in bridge construction, shortens the side span of the bridge, reduces the bridge length and the number of high piers, and reduces the construction cost. At the same time, the staggered arrangement of high towers and low towers makes the structure more aesthetically pleasing.

[0016] (2) The multi-tower high-low tower rigid frame cable-stayed bridge structure provided by the present invention adopts a structural form of a combination of double-limb thin-walled piers on the side towers and hollow piers on the middle towers, which not only improves the structural strength and rigidity, but also better solves the problem of unfavorable stress under the action of temperature force and seismic force on long-span bridges.

[0017] (3) The multi-tower high-low tower rigid frame cable-stayed bridge structure provided by the present invention is simple and economical. Due to the reduction in engineering workload, the construction period is greatly shortened compared with the traditional cable-stayed bridge. It is particularly suitable for construction on terrain with a large height difference between the two sides of the bridge or on V-shaped canyon terrain. It can be widely promoted in canyon bridge construction, has a great social impact and can bring great economic benefits.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a traditional cable-stayed bridge with separated piers and beams;

[0020] Figure 2 It is a schematic diagram of the structure of a traditional cable-stayed bridge with two towers and three spans and equal-height towers;

[0021] Figure 3 It is a structural schematic diagram of a cable-stayed bridge of a multi-tower high-low tower rigid frame system of the present invention;

[0022] Figure 4It is a three-dimensional model diagram of the cable-stayed bridge structure of the multi-tower high-low tower rigid frame system of the present invention;

[0023] Figure 5 is a schematic cross-sectional elevation diagram of a low pier in the present invention;

[0024] Figure 6 It is a schematic cross-sectional elevation diagram of the high pier in the present invention.

[0025] Explanation of the reference numerals: 1. side tower; 2. middle tower; 3. main beam; 4. inclined cable; 5. first low pier; 6. high pier; 7. second low pier; 8. reinforced concrete convex decorative strip. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0029] like Figure 3 and Figure 4As shown, this embodiment provides a cable-stayed bridge structure of a multi-tower high-low tower rigid frame system, including a main beam 3, bridge piers, bridge towers and a plurality of inclined cables 4 anchored at both ends on the bridge towers and the main beam 3, respectively. The bridge piers include low piers arranged on both sides along the bridge direction and fixed to the main beam 3, and high piers 6 arranged in the middle along the bridge direction and fixed to the main beam 3; the bridge towers include side towers 1 and middle towers 2, the bottom of the side tower 1 is fixed to the main beam 3 corresponding to the low piers, the bottom of the middle tower 2 is fixed to the main beam 3 corresponding to the high pier 6, and the tower height of the middle tower 2 above the bridge deck is greater than the tower height of the side tower 1 above the bridge deck. This embodiment breaks through the conventional two-tower and three-span cable-stayed bridge structure, builds a large-span cable-stayed bridge for mountainous canyon terrain, fully utilizes the V-shaped terrain conditions at the bridge site, and uses a combination of high piers and low piers to solve the disadvantage of large terrain height difference, turning terrain disadvantages into advantages in bridge construction, and uses high towers + large spans to cross the canyon river to reduce the number of bridge piers, and uses low towers + small spans to complete the smooth connection with the roadbed on both sides, shortening the bridge length and greatly reducing the project cost. At the same time, the staggered arrangement of high towers and low towers makes the structure more aesthetically pleasing.

[0030] In a detailed implementation method, the bridge tower is a double-column bridge tower, and the bridge tower is bifurcated into two independent tower columns at the consolidation point of the bridge pier, the main beam 3, and the bridge tower; in order to adapt to the wire tube cable saddle, the tower column adopts a rectangular solid cross-section, the cross-section of the bridge tower is arched along the bridge, and the width of the middle tower 2 along the bridge is greater than the width of the side tower 1 along the bridge, and the width of the middle tower 2 and the side tower 1 in the transverse direction of the bridge is consistent. Specifically, the tower column of the middle tower 2 above the bridge deck is 45m high, and the tower column of the side tower 1 above the bridge deck is 35.5m high. The side tower 1 along the bridge is 12m wide, the middle tower 2 is 16m wide, and the side tower 1 and the middle tower 2 are 2.5m wide in the transverse direction of the bridge.

[0031] like Figure 1 and 5 As shown, the low pier adopts a double-limb thin-wall pier, and the double-limb thin-wall pier structure design is adopted on the side of the low tower (i.e., the side tower 1), which reduces the anti-thrust stiffness of the bridge pier, enhances the adaptability of the temperature force of the long-span bridge, and can effectively overcome the adverse effects of the force under the action of the temperature force and seismic force of the long-span bridge, and further makes the bridge type scheme and the geographical environment perfectly combined. Further, in order to adapt to the geographical environment, the low piers on both sides of the bridge along the bridge can also be designed to have different heights. Correspondingly, according to the height of the pier, the height range of the double-limb thin wall is increased or decreased accordingly to improve the longitudinal deformation problem of the bridge pier; specifically, the low pier includes a first low pier 5 and a second low pier 7, the height of the first low pier 5 is greater than the height of the second low pier 7, and the lower spacing of the double-limb thin wall of the first low pier 5 is designed to be smaller than the lower spacing of the double-limb thin wall of the second low pier 7. Specifically, only a 50cm gap is left at the lower part of the double-limb thin wall of the first low pier. This structural design cooperates with the height of the first low pier 5 to increase the stress area of ​​the first low pier 5.

[0032] The high pier 6 adopts a hollow pier with a rectangular cross section. The hollow pier has the advantages of small cross-sectional area, light weight, and good structural rigidity. The high pier 6 design using this hollow pier on the side of the high tower (i.e., the middle tower 2) improves the structural strength and rigidity. Specifically, Figure 6 As shown, the cross-sectional area of ​​the high pier 6 parallel to the main beam 3 gradually increases from top to bottom along the height direction, that is, the cross-sectional area of ​​the bottom of the high pier 6 parallel to the main beam 3 is larger than the cross-sectional area of ​​the top of the high pier 6. This structural design increases the stiffness and bearing capacity of the bridge.

[0033] Optimized, such as Figure 1 and Figure 6 As shown, the surface of the high pier 6 is provided with a reinforced concrete convex decorative strip 8, and the reinforced concrete convex decorative strip 8 on the high pier 6 can echo the double-limb thin-walled piers on both sides thereof, thereby visually forming three thin-walled piers arranged on the same bridge, with a better landscape effect.

[0034] The cross section of the main beam 3 is a box-shaped concrete cross section, and the bottom of the main beam 3 is arranged in a circular curve or a parabola, and the inclined cable 4 is anchored outside the box.

[0035] The multi-tower high-low tower rigid frame system cable-stayed bridge structure of the present embodiment is optimized and transformed on the basis of the traditional symmetrical double-tower cable-stayed bridge with equal height. The construction method is not significantly different from that of the traditional cable-stayed bridge, but the structure creatively uses the combination of multi-tower high-low towers, hollow piers and double-limb thin-walled piers to solve the problem of crossing wide and deep canyons in mountainous areas, fully utilizes the terrain conditions, shortens the bridge span and reduces the project cost. It has a simple structure, a wide range of applicability and good economy, and can be greatly promoted in the construction of bridges in mountainous areas.

[0036] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A cable-stayed bridge structure with multiple high-low tower rigid frame system, comprising a main beam, bridge piers, bridge towers, and a plurality of inclined cables with two ends respectively anchored on the bridge towers and the main beam, characterized in that: The bridge piers include low piers arranged on both sides along the bridge direction and fixed to the main beam, and high piers arranged in the middle along the bridge direction and fixed to the main beam; the bridge towers include side towers and middle towers, the bottom of the side towers is fixed to the main beam corresponding to the low piers, the bottom of the middle towers is fixed to the main beam corresponding to the high piers, and the tower height of the middle towers above the bridge deck is greater than the tower height of the side towers above the bridge deck.

2. A cable-stayed bridge structure with multiple high-low tower rigid frame system as claimed in claim 1, characterized in that: The bridge tower is a double-column bridge tower, and the bridge tower is bifurcated into two independent tower columns at the junction of the pier, the main beam and the bridge tower.

3. A cable-stayed bridge structure with multiple high-low tower rigid frame system as claimed in claim 2, characterized in that: The cross-section of the bridge tower along the bridge direction is arched, and the width of the widest part of the middle tower along the bridge direction is greater than the widest width of the side towers along the bridge direction. The width of the middle tower and the side towers in the transverse direction of the bridge is consistent.

4. A cable-stayed bridge structure with multiple high-low tower rigid frame system as claimed in claim 1, characterized in that: The high pier adopts a hollow pier with a rectangular cross-section, and the cross-sectional area of ​​the high pier parallel to the main beam gradually increases from top to bottom along the height direction.

5. A cable-stayed bridge structure with multiple high-low tower rigid frame system as claimed in claim 4, characterized in that: The surface of the high pier is provided with a reinforced concrete convex decorative strip.

6. The cable-stayed bridge structure of a multi-tower high-low tower rigid frame system as claimed in claim 1, characterized in that: The low pier adopts a double-limb thin-wall pier.

7. A cable-stayed bridge structure with multiple high-low tower rigid frame system as claimed in claim 6, characterized in that: The low pier includes a first low pier and a second low pier, the height of the first low pier is greater than the height of the second low pier, and the spacing between the lower parts of the double-limb thin walls of the first low pier is smaller than the spacing between the lower parts of the double-limb thin walls of the second low pier.

8. The cable-stayed bridge structure of a multi-tower high-low tower rigid frame system as claimed in claim 1, characterized in that: The cross section of the main beam is a box-shaped concrete cross section, and the bottom of the main beam is arranged in a circular curve or a parabola.

Images