Large-span suspension bridge tower with circular inner part and elliptical outer part in bridge direction

Abstract

The invention discloses a large-span suspension bridge tower with a circular inner part and an elliptical outer part in the bridge direction. The bridge tower is composed of a main body and a base structure, the inner circle outline of the main body structure is in a complete circle shape, the outer oval outline is composed of an outer arc and an outer oval arc, the upper half portion of the outer oval arc outline is provided with a rear-mounted structure, and the rear-mounted structure is mounted after a main cable is erected so as to solve the problem that the main cable winds around the tower. The base structure comprises a foundation, a tower base and other components, and the lower tower column is inclined and connected with the tower base through a special combination section. In addition, the bridge tower is further provided with a bracket, a main beam and the like. The outline of the outer elliptic arc is a half elliptic arc, and the main cable saddle is connected with a bridge tower through a high-strength bolt anchoring system. According to the bridge tower, the flexibility of the circular bridge tower and the main cable is integrated, and the landscape effect is improved; the stress design is optimized, and the manufacturing cost of the bridge tower is reduced; the water blocking area is reduced, and the environment-friendly requirement is met; and meanwhile, the vertical rigidity and the anti-seismic property of the main span are improved. During implementation, targeted design needs to be carried out according to actual bridge conditions, construction is completed through multiple steps, and the application prospect is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a long-span suspension bridge with a bridge tower that is circular inward and elliptical outward along the bridge, aiming to solve the difficult problems of the bridge tower of the long-span suspension bridge in terms of landscape and stress, and improve the comprehensive performance of the bridge. Background Art

[0002] As the key load-bearing components and important landscape elements of cable-stayed bridges and suspension bridges, the shape of bridge towers has a significant impact on the overall effect of the bridge. Currently, the common shapes of bridge towers, such as diamond, H, A, and inverted Y, are mostly composed of lines, and the landscape shape is relatively monotonous, which is difficult to meet the growing landscape needs of urban bridges.

[0003] As a new type of landscape bridge tower, the circular bridge tower along the bridge has a round and beautiful shape, unique visual effects, and strong landscape symbolism. For example, the Diehu Bridge on Chaosheng Road in Zhengzhou and the Xuri Interchange on Ziqi Road in Siping have become urban landmark buildings, showing good development potential. However, the circular bridge towers along the bridge that have been built are mostly used in cable-stayed bridges. The cable-stayed cables of cable-stayed bridges show rigid beauty, which is inconsistent with the flexible beauty of circular bridge towers.

[0004] In the field of suspension bridges, although the combination of circular pylons and the curved and flexible beauty of the main cables can achieve a more prominent landscape effect, the actual application faces many technical difficulties. The only circular pylon suspension bridge that has been built, the Lusail Bridge in Doha, Qatar, has a span of only (75+129)m. The main cable is disconnected and directly anchored to the pylon. This method is not suitable for long-span suspension bridges because the axial force of the main cable of a long-span suspension bridge is as high as tens of thousands of tons, and direct anchoring is technically not feasible. In addition, the huge concentrated force of the main cable saddle of the suspension bridge on the top of the tower will produce a huge bending moment in the circular pylon, causing the pylon to be unfavorably stressed. Moreover, when the circular pylon is directly arranged in the river or water along the bridge, the water blocking area is large, and the water blocking rate may exceed 7%, which will affect the flood discharge capacity and stability of the river. It is also challenging to reduce its water blocking area. Summary of the invention

[0005] The present invention aims to provide a bridge tower of a long-span suspension bridge which is circular inward and elliptical outward along the bridge direction, so as to solve the technical problems of bypassing the bridge tower, coordinating the landscape and the force, and reducing the water-blocking area when the circular bridge tower along the bridge direction is applied to the long-span suspension bridge, so as to achieve the perfect unity of the landscape and the force, and improve the comprehensive performance of the bridge.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a long-span suspension bridge with an inwardly circular and outwardly elliptical bridge tower along the bridge. The bridge tower includes a bridge tower main structure and a bridge tower base structure. The bridge tower main structure includes an inner circular contour 8 and an outer elliptical contour, and the cross section of the inner circular contour 8 is a complete circle; the outer elliptical contour is composed of an outer circular arc contour 9 in the lower half and an outer elliptical arc contour 10 in the upper half. The rear-mounted structure 11 is arranged in the upper half of the outer elliptical arc contour 10, and is used to adapt to the path of the main cable 13 around the tower and is installed after the main cable 13 is erected; the bridge tower base structure includes a foundation 1, a tower seat 2, a lower tower column 3 and a straight crossbeam 6. The tower seat 2 is arranged on the foundation 1, and the upper end of the lower tower column 3 is provided with a straight crossbeam 6. It is tangent to the outer arc profile 9, and the lower end is connected to the tower base 2 through an inclined steel-concrete joint section; the straight crossbeam 6 is arranged between the lower tower columns 3; it further includes a corbel 4, a main beam 5, a crossbeam decoration 7, a main cable saddle 12, a main cable mid-span side outlet 14, a main cable side span side outlet 15, a vertical support 16 and a longitudinal damper 17; the corbel 4 is arranged on the two tower limbs of the lower tower column 3, the main beam 5 is supported on the corbel 4 through the vertical support 16, the main cable saddle 12 is arranged on the top of the outer elliptical arc profile 10, the main cable 13 passes through the main cable saddle 12, the main cable mid-span side outlet 14 and the main cable side span side outlet 15 are respectively arranged on both sides of the rear-mounted structure 11, and the longitudinal damper 17 is arranged on the two tower limbs of the lower tower column 3.

[0007] Furthermore, the rear-mounted structure 11 is connected to the bridge tower body by high-strength bolts, and the material is Q345C steel.

[0008] Furthermore, the outer elliptical arc profile 10 is a half elliptical arc, and the main cable saddle 12 is connected to the bridge tower through a high-strength bolt anchoring system.

[0009] Furthermore, the outer arc contour 9 is a half arc and is tangent to the bridge deck.

[0010] Furthermore, it is characterized in that the beam decoration 7 is arranged outside the straight beam 6 to hide the straight beam 6.

[0011] Furthermore, the inclination angle of the lower tower column 3 is 10° to 30°, and the steel-concrete joint section adopts a pressure-bearing shear-transmitting connection structure.

[0012] Furthermore, the longitudinal width of the tower base 2 is reduced to reduce the water blocking area.

[0013] Furthermore, the main cable 13 is supported on the bridge tower through the main saddle 12.

[0014] Furthermore, the vertical support 16 is used to support the main beam 5 to improve the vertical stiffness of the main span.

[0015] Furthermore, the longitudinal damper 17 is used to improve the seismic performance of the bridge, and the damping coefficient of the longitudinal damper is ≥2000 kN·s / m.

[0016] Beneficial effects:

[0017] The landscape effect is significantly improved: the inner circle achieves a perfect fusion of the round and flexible beauty of the circular bridge tower and the flexible beauty of the main cable curve, creating a very shocking aesthetic effect. It can become a landmark landscape of the city and enhance the city's image.

[0018] Optimized stress performance: The outer elliptical design meets the stress requirements of the main cable winding tower and the bridge tower, reduces the bending moment generated by the main cable saddle, reduces the bending moment at the bottom of the tower with the help of hidden straight beams, improves the overall stress condition of the bridge tower, increases the bearing capacity and stability of the bridge tower, and reduces the cost of the bridge tower.

[0019] Reduce the impact of water blocking: The special design of the lower tower column effectively reduces the water blocking area, reduces the impact on the river's flood discharge capacity and stability, and meets the requirements of water conservancy projects and environmental protection.

[0020] Improve the overall performance of the bridge: The setting of corbels, vertical supports and longitudinal dampers improves the vertical stiffness of the main span and the seismic performance of the bridge, and enhances the overall performance and safety of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 The present invention is a schematic elevation diagram of a long-span suspension bridge with a bridge tower that is circular inward and elliptical outward along the bridge.

[0022] Attached Figure 2 The figure is a side view of a long-span suspension bridge of the present invention, in which a bridge tower is circular inward and elliptical outward along the bridge.

[0023] In the figure: 1 - foundation; 2 - tower base; 3 - lower tower column; 4 - corbel; 5 - main beam; 6 - straight crossbeam; 7 - crossbeam decoration; 8 - inner circle profile; 9 - outer arc profile; 10 - outer elliptical arc profile; 11 - rear-mounted structure; 12 - main saddle; 13 - main cable; 14 - main cable mid-span side outlet; 15 - main cable side span side outlet; 16 - vertical support; 17 - longitudinal damper. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0026] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0027] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0029] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0031] When implementing the technology of the present invention, it is necessary to carry out targeted design based on factors such as the actual span of the bridge, the height of the bridge tower, the landscape requirements, and the geological conditions. During the design process, the tension of the main cable and the load borne by the bridge tower are accurately calculated, and the size and curvature of the inner circle and outer ellipse, as well as the structural dimensions and material strength of each component are reasonably determined.

[0032] See also Figure 1 and Figure 2It can be seen that the long-span suspension bridge in this example has an inner circular and outer elliptical bridge tower along the bridge. The bridge tower includes a bridge tower main structure and a bridge tower base structure. The bridge tower main structure includes an inner circular contour 8 and an outer elliptical contour. The cross section of the inner circular contour 8 is a complete circle; the outer elliptical contour is composed of an outer circular arc contour 9 in the lower half and an outer elliptical arc contour 10 in the upper half. The rear-mounted structure 11 is arranged in the upper half of the outer elliptical arc contour 10 to adapt to the path of the main cable 13 around the tower and is installed after the main cable 13 is erected; the bridge tower base structure includes a foundation 1, a tower seat 2, a lower tower column 3 and a straight crossbeam 6. The tower seat 2 is arranged on the foundation 1, and the upper end of the lower tower column 3 is aligned with the outer circular The arc profile 9 is tangent, and the lower end is connected to the tower base 2 through an inclined steel-concrete joint section; a straight crossbeam 6 is arranged between the lower tower columns 3; it further includes a corbel 4, a main beam 5, a crossbeam decoration 7, a main cable saddle 12, a main cable mid-span side outlet 14, a main cable side span side outlet 15, a vertical support 16 and a longitudinal damper 17; the corbel 4 is arranged on the two tower limbs of the lower tower column 3, the main beam 5 is supported on the corbel 4 through the vertical support 16, the main cable saddle 12 is arranged at the top of the outer elliptical arc profile 10, the main cable 13 passes through the main cable saddle 12, the main cable mid-span side outlet 14 and the main cable side span side outlet 15 are respectively arranged on both sides of the rear-mounted structure 11, and the longitudinal damper 17 is arranged on the two tower limbs of the lower tower column 3. By setting a hidden straight beam in the lower part of the circle, the bending moment at the bottom of the tower can be greatly reduced, and the stress on the tower can be improved compared with directly setting an arc-shaped beam or the traditional setting of a straight beam at the bridge deck. The straight beam is wrapped with a decorative structure to form a circular shape, achieving coordination between architectural aesthetics and structural stress.

[0033] The main construction steps of the long-span suspension bridge in this embodiment include:

[0034] Foundation construction: pour the foundation according to geological conditions and design requirements 1. Before construction, a detailed survey of geological conditions is required to determine the bearing capacity and stability of the foundation. The construction quality of the foundation directly affects the stability of the entire bridge tower. Therefore, the concrete ratio and pouring process must be strictly controlled during the construction process to ensure the strength and durability of the foundation.

[0035] Tower base construction: Tower base 2 is built on the foundation. The tower base adopts a reinforced concrete structure and is firmly connected to the foundation. The design of the tower base needs to take into account its connection method and force characteristics with the foundation to ensure that the tower base can effectively transfer the load of the bridge tower to the foundation. During the construction process, the quality of steel bar binding and concrete pouring must be strictly controlled to ensure the structural safety of the tower base. At the same time, the longitudinal width of the tower base is reduced, thereby reducing the water blocking area and reducing the impact on the flood discharge capacity and stability of the river channel.

[0036] Construction of lower tower column: Build lower tower column 3 on the tower base. The lower tower column adopts an inclined straight line segment design, and the upper end is tangent to the arc, so the force transmission is smooth. The design of the lower tower column needs to take into account its connection method and force characteristics with the tower base to ensure that the lower tower column can effectively transfer the load of the bridge tower to the tower base. Both tower limbs of the lower tower column are provided with corbels 4, and vertical supports 16 are provided on the corbels to support the main beam 5, so as to improve the vertical stiffness of the main span. At the same time, longitudinal dampers 17 are provided to improve the seismic performance of the bridge. During the construction process, the installation accuracy of the corbels and vertical supports must be strictly controlled to ensure that they can effectively transfer loads and improve the seismic performance of the bridge.

[0037] Crossbeam construction: A hidden straight crossbeam 6 is set at the ring of the lower tower column. The straight crossbeam is covered with a decorative structure to form a ring shape, achieving the coordination of architectural aesthetics and structural stress. The design of the crossbeam needs to consider its connection method and stress characteristics with the lower tower column to ensure that the crossbeam can effectively transfer the load and improve the stability of the bridge tower. The crossbeam is firmly connected to the lower tower column to ensure the integrity of the structure. During the construction process, the installation accuracy and connection quality of the crossbeam must be strictly controlled to ensure that it can effectively transfer the load and improve the stability of the bridge tower.

[0038] Construction of inner circle profile: The inner circle profile 8 is constructed above the beam. The inner circle profile adopts steel structure or reinforced concrete structure to create a round and beautiful landscape shape. The design of the inner circle profile needs to consider its connection method with the beam and its stress characteristics to ensure that the inner circle profile can effectively transfer the load and improve the landscape effect of the bridge tower. During the construction process, the installation accuracy and connection quality of the inner circle profile need to be strictly controlled to ensure that it can effectively transfer the load and improve the landscape effect of the bridge tower.

[0039] Construction of outer arc profile: The outer arc profile 9 is constructed outside the outer arc profile. The lower part of the outer arc profile is half an arc, which is tangent to the bridge deck, forming a beautiful landscape of "bright moon" rising from the river surface. The design of the outer arc profile needs to consider its connection method and force characteristics with the inner arc profile to ensure that the outer arc profile can effectively transfer loads and improve the landscape effect of the bridge tower. During the construction process, the installation accuracy and connection quality of the outer arc profile need to be strictly controlled to ensure that it can effectively transfer loads and improve the landscape effect of the bridge tower.

[0040] Construction of the outer elliptical arc profile: The outer elliptical arc profile 10 is constructed above the outer circular arc profile. The upper half of the outer elliptical arc profile is a half elliptical arc, which is designed as a post-installed structure and will be installed after the cable system construction is completed. This solves the problem of the conflict between the main cable line shape and the outer contour of the circular bridge tower, allowing the main cable to bypass the circular bridge tower to meet the structural system requirements of a long-span suspension bridge. The design of the outer elliptical arc profile needs to consider its connection method and force characteristics with the outer circular arc profile to ensure that the outer elliptical arc profile can effectively transfer loads and improve the landscape effect of the bridge tower. During the construction process, the installation accuracy and connection quality of the outer elliptical arc profile must be strictly controlled to ensure that it can effectively transfer loads and improve the landscape effect of the bridge tower.

[0041] Installation of main saddle and main cable: Install the main saddle 12 on the top of the tower. The main saddle is firmly connected to the outer elliptical arc contour to bear the tension of the main cable. The design of the main saddle needs to take into account its connection method and force characteristics with the outer elliptical arc contour to ensure that the main saddle can effectively transmit the tension of the main cable and improve the stability of the bridge tower. Pass the main cable 13 through the main saddle, lead it out from the main cable mid-span side outlet 14 and the main cable side span side outlet 15 to complete the installation of the main cable. During the construction process, the installation accuracy and connection quality of the main saddle and main cable must be strictly controlled to ensure that they can effectively transmit the tension of the main cable and improve the stability of the bridge tower.

[0042] Through the above construction steps, the construction of the long-span suspension bridge of the present invention with an inner circular and outer elliptical bridge tower can be completed. The bridge tower not only has an outstanding landscape effect, but also can meet the force requirements of the long-span suspension bridge, and has a wide range of application prospects.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A long-span suspension bridge with a pylon that is circular inward and elliptical outward along the bridge, characterized in that: The bridge tower comprises a bridge tower main structure and a bridge tower base structure, the bridge tower main structure comprises an inner circular profile (8) and an outer elliptical profile, and the cross section of the inner circular profile (8) is a complete circle; The outer elliptical profile is composed of an outer circular arc profile (9) in the lower part and an outer elliptical arc profile (10) in the upper part. The rear-mounted structure (11) is arranged in the upper part of the outer elliptical arc profile (10) and is used to adapt to the path of the main cable (13) around the tower and is installed after the main cable (13) is installed. The bridge tower base structure comprises a foundation (1), a tower base (2), a lower tower column (3) and a straight beam (6). The tower base (2) is arranged on the foundation (1). The upper end of the lower tower column (3) is tangent to the outer circular arc profile (9), and the lower end is connected to the tower base (2) through an inclined steel-concrete joint section. The straight beam (6) is arranged between the lower tower columns (3). It also further comprises a bull The invention relates to a cable support structure comprising a leg (4), a main beam (5), a cross beam decoration (7), a main cable saddle (12), a main cable mid-span side outlet (14), a main cable side span side outlet (15), a vertical support (16) and a longitudinal damper (17); the corbel (4) is arranged on two tower limbs of the lower tower column (3); the main beam (5) is supported on the corbel (4) through the vertical support (16); the main cable saddle (12) is arranged on the top of the outer elliptical arc profile (10); the main cable (13) passes through the main cable saddle (12); the main cable mid-span side outlet (14) and the main cable side span side outlet (15) are respectively arranged on both sides of the rear-mounted structure (11); and the longitudinal damper (17) is arranged on the two tower limbs of the lower tower column (3).

2. The long-span suspension bridge according to claim 1 is characterized in that the bridge tower is circular inward and elliptical outward along the bridge. The rear-mounted structure (11) is connected to the bridge tower body by high-strength bolts, and the material is Q345C steel.

3. The long-span suspension bridge according to claim 1 has a bridge tower with an inward circular and an outer elliptical shape along the bridge, characterized in that: The outer elliptical arc profile (10) is a half elliptical arc, the main cable saddle (12) is connected to the bridge tower through a high-strength bolt anchoring system, and the distance between the mid-span side outlet (14) and the side span side outlet (15) of the main cable (13) is 1.2 to 1.5 times the height of the bridge tower.

4. The long-span suspension bridge according to claim 1 has a bridge tower with an inward circular and an outer elliptical shape along the bridge, characterized in that: The outer arc profile (9) is a half arc and is tangent to the bridge deck.

5. The long-span suspension bridge according to claim 1 has a bridge tower with an inward circular and an outer elliptical shape along the bridge, characterized in that: The crossbeam decoration (7) is arranged outside the straight crossbeam (6) to hide the straight crossbeam (6).

6. The long-span suspension bridge according to claim 1 has a bridge tower that is circular inward and elliptical outward along the bridge, characterized in that: The inclination angle of the lower tower column (3) is 10° to 30°, and the steel-concrete joint section adopts a bolt-bearing shear-transmitting connection structure.

7. The long-span suspension bridge according to claim 1 has a bridge tower that is circular inward and elliptical outward along the bridge, characterized in that: The longitudinal width of the tower base (2) is reduced to reduce the water blocking area.

8. The long-span suspension bridge according to claim 1 has a bridge tower that is circular inward and elliptical outward along the bridge, characterized in that: The main cable (13) is supported on the bridge tower through the main saddle (12).

9. The long-span suspension bridge according to claim 1 has a bridge tower that is circular inward and elliptical outward along the bridge, characterized in that: The vertical support (16) is used to support the main beam (5) and improve the vertical rigidity of the main span.

10. The long-span suspension bridge according to claim 1 has a bridge tower that is circular inward and elliptical outward along the bridge, characterized in that: The longitudinal damper (17) is used to improve the seismic performance of the bridge, and the damping coefficient of the longitudinal damper is ≥2000 kN·s / m.

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