A flat cable-stayed bridge with a deck mechanism having high wind resistance and stability

Abstract

The present invention discloses a flat-cable bridge with a high wind-resistant stability bridge deck mechanism, comprising a plurality of steel cables extending in the longitudinal direction of the bridge, a plurality of crossbeams distributed along the longitudinal direction of the bridge on the steel cables, and a plurality of bridge decks laid on the crossbeams. The bridge decks can be flipped to form channels for airflow to pass vertically. By providing the flippable bridge decks, when the flat-cable bridge encounters strong winds, the bridge decks can be flipped under the action of the airflow to form channels for airflow to pass vertically, thereby allowing airflow above and below the bridge deck to communicate with each other, thereby effectively changing the flow pattern around the bridge, reducing the pressure difference between the upper and lower surfaces of the bridge, and achieving the purpose of improving the aerodynamic stability of the bridge.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of bridge engineering, and in particular to a flat cable-stayed bridge with a bridge deck mechanism having high wind resistance and stability. Background Art

[0002] Flat-stayed cable-stayed bridges are different from rigid structure bridges such as steel bridges and concrete bridges. They belong to the category of flexible structure bridge systems. Compared with other bridge types, flat-stayed cable-stayed bridges have the advantages of fast erection speed, low engineering investment, and low construction difficulty. In mountainous areas such as Yunnan, Guizhou and Sichuan, flat-stayed cable-stayed bridges are particularly suitable for solving transportation problems for mountain residents. However, due to its simple structure, soft bridge deck, low rigidity, and poor wind resistance. Although the wind resistance of flat-stayed cable-stayed bridges can be improved to a certain extent by setting up stabilizing beams, its effect is very limited, and wind-induced vibration of flat-stayed cable-stayed bridges often occurs. The problem of wind-induced vibration of flat-stayed cable-stayed bridges has become the main technical bottleneck for the promotion and application of flat-stayed cable-stayed bridges. Therefore, there is an urgent need for a flat-stayed cable-stayed bridge with a bridge deck mechanism with high wind resistance and stability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a flat-stayed cable bridge with a bridge deck mechanism having high wind resistance and stability.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A flat cable-stayed bridge with a bridge deck mechanism with high wind resistance and stability comprises a plurality of steel cables extending in the longitudinal direction of the bridge, a plurality of cross beams distributed on the steel cables in the longitudinal direction of the bridge, a plurality of bridge decks laid on the cross beams, and the bridge decks can be flipped to form channels for airflow to pass vertically.

[0006] As a further improvement of the above technical solution:

[0007] The end of the bridge deck is hinged to the crossbeam, and the hinge axis is connected to a regulating device for controlling the overturning.

[0008] The flat-stayed cable bridge further comprises a locking mechanism for keeping the bridge deck in a flipped posture.

[0009] The hinge shaft is configured as a gear shaft; the regulating device includes a viscous damper fixed to the crossbeam, the movable rod of the viscous damper is connected to the slide rod via a slider, and the slide rod is formed with bar teeth that can engage with the hinge shaft.

[0010] A spacing section is provided between the bar teeth and the hinge shaft.

[0011] The regulating device includes a viscous damper fixed to the crossbeam, the movable rod of the viscous damper is connected to the sliding rod via a slider, a sliding groove is formed on the sliding rod, a support rod is slidably installed in the sliding groove, and the end of the support rod away from the sliding groove is connected to the hinge shaft; when the support rod moves in the sliding groove, it can drive the hinge shaft to rotate.

[0012] The chute is in a stepped shape, formed by a lower horizontal section, an inclined section and an upper horizontal section connected in sequence.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] By setting up a flippable bridge deck, when the flat-cable bridge encounters strong winds, the bridge deck can be flipped under the action of the airflow to form a channel for the airflow to pass vertically, so that the airflow above and below the bridge deck can communicate with each other, thereby effectively changing the flow pattern around the bridge, reducing the pressure difference between the upper and lower surfaces of the bridge, and achieving the purpose of improving the aerodynamic stability of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a structural diagram of the flat-stayed cable bridge in Example 1 (bridge deck flipped state);

[0016] Figure 2 1 is a structural diagram of the flat-stayed cable bridge in Example 1 (bridge deck in flat-laying state);

[0017] Figure 3 is a structural schematic diagram of the flat-stayed cable bridge in Example 2;

[0018] Figure 4 It is a partial schematic diagram of the flat-stayed cable bridge in Example 2.

[0019] The numbers in the figure represent: 1. Steel cable; 2. Crossbeam; 3. Bridge deck; 31. Articulated shaft; 4. Control device; 41. Viscous damper; 411. Movable rod; 42. Slider; 43. Sliding rod; 431. Bar tooth; 432. Spacer section; 44. Slide groove; 441. Lower horizontal section; 442. Inclined section; 443. Upper horizontal section; 45. Support rod; 5. Locking mechanism. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1 and Figure 2As shown, the flat-stayed cable bridge of this embodiment, which has a high wind-resistant stability deck mechanism, includes several steel cables 1 extending in the longitudinal direction of the bridge. Several crossbeams 2 are distributed along the longitudinal direction of the bridge on the steel cables 1. Several bridge decks 3 are laid on the crossbeams 2. The bridge decks 3 can be flipped to form channels for airflow to pass vertically. By providing flippable bridge decks 3, when the flat-stayed cable bridge encounters strong winds, the bridge decks 3 can be flipped under the influence of the airflow to form channels for airflow to pass vertically, thereby allowing airflow above and below the bridge deck to communicate with each other, thereby effectively changing the flow pattern around the bridge, reducing the pressure difference between the upper and lower surfaces of the bridge, and achieving the purpose of improving the aerodynamic stability of the bridge.

[0023] In this embodiment, the ends of the bridge deck 3 are hinged to the crossbeam 2, and the hinge axis 31 is connected to a control device 4 for controlling the flipping of the bridge deck 3. The control device 4 allows for orderly flipping of the bridge deck 3, thus preventing the impact of disorderly flipping on pedestrians and vehicles. Specifically, the hinge axis 31 is configured as a gear shaft. The control device 4 includes a viscous damper 41 fixed to the crossbeam 2. The movable rod 411 of the viscous damper 41 is connected to a slide bar 43 via a slider 42. The slide bar 43 is formed with bar teeth 431 that can mesh with the hinge axis 31. A spacer 432 is provided between the bar teeth 431 and the hinge axis 31. When wind speeds are low and below the critical wind speed for bridge flutter, or when vehicles or pedestrians are passing on the bridge, bridge vibrations are minimal, and the slider 42 and slide bar 43 vibrate slightly within a certain range. The slider 42 acts as a tuned mass damper, working together with the viscous damper 41 to achieve the desired vibration reduction effect. Because a spacer 432 is provided between the bar teeth 431 and the hinge shaft 31, even if the slider 42 moves at low wind speeds, as long as the bar teeth 431 are not engaged with the hinge shaft 31 (i.e., the hinge shaft 31 is within the spacer 432), the bridge deck 3 will remain closed, thus preventing any impact on the appearance of vehicles or pedestrians. In this situation, the bridge deck 3 primarily functions as a damper, reducing bridge vibration amplitude and ensuring comfortable travel. When a flat-stayed cable bridge encounters strong winds exceeding the bridge's critical flutter speed, the bridge's large vibrations cause the slider 42 and slide rod 43 to vibrate significantly. The slider 42's function as a tuned mass damper, combined with the viscous damper 41, can, to a certain extent, increase the bridge's critical flutter speed. Furthermore, due to the large vibrations of the slide rod 43 and the engagement of the bar teeth 431 with the hinge shaft 31, the bridge deck 3 is driven to periodically flip, increasing its air permeability, reducing the pressure difference between the upper and lower surfaces of the crossbeam 2, improving the bridge's flutter performance, and ensuring the safety of the bridge structure. In other embodiments, the regulating device 4 can also be configured as an active regulator with power output, and the bridge deck 3 can be actively driven to flip through the action of the regulating device 4 .

[0024] In this embodiment, the flat-stayed cable bridge also includes a locking mechanism 5 for maintaining the bridge deck 3 in a flipped position. By providing this locking mechanism 5, when the bridge amplitude increases further, the locking mechanism 5 is triggered, forcing the bridge deck 3 to maintain its flipped position, maximizing the bridge deck's air permeability, further improving the bridge's flutter performance, and protecting the bridge structure from damage in strong winds. When the strong winds subside, simply resetting the locking mechanism 5 restores the bridge deck 3 to its flat position, allowing the flat-stayed cable bridge to quickly regain traffic capacity. Specifically, the locking mechanism 5 can be composed of a locking rod provided on the crossbeam 2 and a buckle provided on the slider 42.

[0025] Example 2

[0026] according to Figure 3 and Figure 4 As shown, a second embodiment of a flat-stayed cable bridge having a high wind-resistant stability bridge deck mechanism according to the present invention is substantially the same as the first embodiment, except that: in this embodiment, the control device 4 includes a viscous damper 41 fixed to the crossbeam 2. The movable rod 411 of the viscous damper 41 is connected to a slide bar 43 via a slider 42. The slide bar 43 is formed with a slide groove 44. A support rod 45 is slidably mounted within the slide groove 44. The end of the support rod 45 away from the slide groove 44 is connected to the hinge shaft 31. When the support rod 45 moves within the slide groove 44, it can drive the hinge shaft 31 to rotate. The slide groove 44 is stepped, formed by a lower horizontal section 441, an inclined section 442, and an upper horizontal section 443, which are connected in sequence. When wind speeds are low and below the bridge's critical flutter speed, or when vehicles or pedestrians are passing on the bridge, the bridge vibrates slightly. Slider 42 and slide rod 43 vibrate slightly within a certain range, while support rod 45 moves within lower horizontal section 441 or upper horizontal section 443. Slider 42 acts as a tuned mass damper, working in conjunction with viscous damper 41 to achieve the desired vibration reduction effect. Bridge deck 3 remains closed, primarily acting as a damper, reducing bridge vibration amplitude and ensuring comfortable travel. When a flat-stayed cable bridge encounters strong winds exceeding the bridge's critical flutter speed, the bridge's large vibrations cause slider 42 and slide rod 43 to vibrate significantly. The tuned mass damper function of slider 42, combined with viscous damper 41, can, to a certain extent, increase the bridge's critical flutter speed. At the same time, due to the large-scale vibration of the sliding rod 43 and the entry of the support rod 45 into the inclined section 442, the bridge deck 3 is driven to flip periodically, thereby improving the air permeability of the bridge deck, reducing the pressure difference between the upper and lower surfaces of the beam 2, improving the vibration performance of the bridge, and ensuring the safety of the bridge structure.

[0027] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A flat-stayed cable bridge with a deck structure having high wind resistance and stability, characterized by: The invention comprises a plurality of steel cables (1) extending in the longitudinal direction of the bridge, a plurality of cross beams (2) distributed on the steel cables (1) in the longitudinal direction of the bridge, a plurality of bridge panels (3) laid on the cross beams (2), and the bridge panels (3) can be turned over to form channels for airflow to pass through vertically; the ends of the bridge panels (3) are hinged to the cross beams (2), and the hinge shafts (31) thereof are connected to a control device (4) for controlling the turning; The control device (4) includes a viscous damper (41) fixed to the crossbeam (2), a movable rod (411) of the viscous damper (41) is connected to a slide rod (43) via a slider (42), a slide groove (44) is formed on the slide rod (43), a support rod (45) is slidably installed in the slide groove (44), and the end of the support rod (45) away from the slide groove (44) is connected to the hinge shaft (31); when the support rod (45) moves in the slide groove (44), it can drive the hinge shaft (31) to rotate; the slide groove (44) is in a stepped shape, formed by a lower horizontal section (441), an inclined section (442) and an upper horizontal section (443) connected end to end in sequence; Alternatively, the hinge shaft (31) is configured as a gear shaft, the control device (4) includes a viscous damper (41) fixed to the crossbeam (2), a movable rod (411) of the viscous damper (41) is connected to a slide bar (43) via a slider (42), and a strip tooth (431) capable of engaging with the hinge shaft (31) is formed on the slide bar (43); a spacer section (432) is provided between the strip tooth (431) and the hinge shaft (31).

2. The flat-stayed cable bridge with a high wind-resistant stability bridge deck structure according to claim 1, characterized in that: The flat-stayed cable bridge further comprises a locking mechanism (5) for keeping the bridge deck (3) in a flipped posture.

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