A vibration suppression device for a steel-concrete composite box girder bridge under axle coupling action

Abstract

The application discloses a vibration suppression device for a steel-concrete combined box girder bridge under axle coupling, and belongs to the technical field of bridge engineering, which comprises a wind breaking plate assembly installed on both sides of a steel box girder, wherein the wind breaking plate assembly comprises a plurality of wind breaking plates spliced side by side, two side plates are installed on the wind breaking plate away from the steel box girder, the two side plates are arranged to be inclined away from the steel box girder to the side close to the steel box girder so that a sharp end is formed at the connection of the two side plates, a plurality of self-rotating wind breaking pieces are detachably installed on the side plate away from the steel box girder through a mounting plate, the wind breaking pieces are arranged along the side plate, and a plurality of fan blades are installed on the wind breaking piece in a circumferential direction with a wind breaking piece axis as the center. The application diffuses the wind along the side plates on both sides of the sharp end, thereby dispersing the vortex on the blunt body section on both sides of the bridge, and the influence of vortex shedding on the tail of the bridge section can be reduced. The wind breaking pieces are arranged along the side plate, so that the wind blowing to the side plate from any direction can be dispersed.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, specifically relating to a vibration damping device for steel-concrete composite box girder bridges under vehicle-bridge coupling. Background Technology

[0002] When vehicles cross a bridge, they cause vibrations in the bridge structure, which in turn affect the vehicle's vibration. This interaction and mutual influence is the problem of vibration coupling between vehicles and bridges. Steel box girders, due to their light weight, are widely used in long-span cable-stayed bridges and suspension bridges. Under the vehicle-bridge coupling effect, long-span bridges are also subject to vortex-induced vibrations caused by wind at relatively low wind speeds. Existing technologies provide a vibration damping device for steel box girders to reduce vortex-induced vibrations, such as the one disclosed in CN 218322318 U, which prevents the formation of vortices. When wind blows towards the cross-section, it is dispersed by a first and second arc-shaped plate, consuming the kinetic energy of the wind and preventing vortex formation, thereby reducing the possibility of wind-induced vibrations in the steel box girder and ensuring driving safety. However, due to the uncertainty of wind direction, the above device can only consume the energy of the wind blowing towards the cross-section.

[0003] Therefore, it is necessary to propose a vibration damping device for steel-concrete composite box girder bridges under vehicle-bridge coupling to solve the above problems. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a vibration damping device for steel-concrete composite box girder bridges under vehicle-bridge coupling, which solves the problem that the prior art can only consume energy from the wind blowing towards the cross section.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a vibration damping device for a steel-concrete composite box girder bridge under vehicle-bridge coupling, comprising: a wind-breaking plate assembly installed on both sides of the steel box girder, the wind-breaking plate assembly comprising multiple wind-breaking plates spliced ​​side by side, two side plates installed on the side of the wind-breaking plate away from the steel box girder, the two side plates being inclined so that the connection between the two side plates forms a pointed tip, multiple self-rotating wind-breaking components are detachably installed on the side plates away from the steel box girder via mounting plates, the multiple wind-breaking components are arranged along the side plates, and multiple fan blades are circumferentially installed on the wind-breaking components with the wind-breaking component axis as the center.

[0007] Furthermore, both the top and bottom walls of the windbreak plate are equipped with baffle rods, and each baffle rod has at least one baffle strip arranged spirally along the baffle rod.

[0008] Furthermore, the air-breaking plate has a cavity inside, a rotating shaft is installed on the air-breaking plate, the first end of the side plate is rotatably mounted on the rotating shaft, a drive cylinder is installed inside the air-breaking plate, the output end of the drive cylinder is connected to the second end of the side plate, and the side plate can be rotated around the rotating shaft by the drive cylinder.

[0009] Furthermore, the side plate and the wind-breaking plate are fixedly connected as a whole, and the two side plates are symmetrically arranged about the tip. The side plate is streamlined so that multiple wind-breaking plates are spliced ​​into a wave shape. The wind-breaking component includes multiple wind-breaking rods connected by universal couplings. Multiple fan blades are installed circumferentially on the wind-breaking rod with the wind-breaking rod axis as the center.

[0010] Furthermore, mounting plates are installed at both ends of the side plate, and the air-breaking component is installed between the two mounting plates. A gap is provided between the mounting plate and the side plate so that the air broken through the tip can flow to the air-breaking component through the gap between the mounting plate and the side plate near the tip and flow to the baffle rod through the gap between the mounting plate and the side plate away from the tip.

[0011] Furthermore, the two side plates are symmetrically arranged about the tip.

[0012] The beneficial effects of this invention are as follows: when wind blows towards the steel box girder from the side wall, it passes through the tip and diffuses along the side plates on both sides of the tip, thereby dispersing the vortices on the blunt cross-sections on both sides of the bridge. It can also reduce the impact of vortex shedding at the tail of the bridge cross-section on the cross-section, effectively suppressing the vortex-induced vibration amplitude of the steel box girder and improving flutter stability. Furthermore, when the wind passes through the wind-breaking component, it can drive the wind-breaking rod to rotate through the fan blades, thereby consuming the kinetic energy of the wind and preventing the generation of vortices. Moreover, the wind-breaking component is arranged along the side plates, so that wind blowing towards the side plates from any direction can be dispersed.

[0013] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0015] Figure 1 This is a schematic diagram of the installation of the corrugated windbreak plate according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the wave-shaped windbreak plate structure according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the streamlined side plate structure according to an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the vibration damping device according to an embodiment of the present invention.

[0019] The following components are marked in the attached diagram: steel box girder 1, windbreak plate 2, side plate 201, tip 202, mounting plate 203, rotating shaft 204, drive cylinder 205, windbreak component 3, fan blade 301, universal coupling 302, windbreak bar 303, deflector bar 4, and deflector strip 401. Detailed Implementation

[0020] like Figures 1-4 As shown, the present invention provides a vibration damping device for a steel-concrete composite box girder bridge under vehicle-bridge coupling, comprising: a wind-breaking plate 2 assembly installed on both sides of a steel box girder 1, the wind-breaking plate 2 assembly comprising a plurality of wind-breaking plates 2 spliced ​​side by side, two side plates 201 installed on the side of the wind-breaking plate 2 away from the steel box girder 1, the two side plates 201 being inclined towards the side of the steel box girder 1 so that the connection between the two side plates 201 forms a tip 202, the two side plates 201 being inclined away from the steel box girder 1 so that the connection between the two side plates 201 forms a tip 202, a plurality of self-rotating wind-breaking components 3 being detachably installed on the side plate 201 away from the steel box girder 1 via a mounting plate 203, the plurality of wind-breaking components 3 being arranged along the side plate 201, and a plurality of fan blades 301 being circumferentially installed on the wind-breaking component 3 with the axis of the wind-breaking component 3 as the center.

[0021] In this plan, such as Figure 4 When wind blows towards the steel box girder 1 from the side wall of the vertical steel box girder 1, it passes through the tip 202 and diffuses along the side plates 201 on both sides of the tip 202, thereby dispersing the vortices on the blunt cross-sections on both sides of the bridge and reducing the impact of vortex shedding at the tail of the bridge cross-section on the cross-section. This can effectively suppress the vortex vibration amplitude of the steel box girder and improve flutter stability. Furthermore, when the wind passes through the wind-breaking component 3, it can drive the wind-breaking rod 303 to rotate through the fan blade 301, thereby consuming the kinetic energy of the wind and preventing the generation of vortices. Moreover, the wind-breaking component 3 is arranged along the side plate 201, so that wind blowing towards the side plate 201 from any direction can be dispersed.

[0022] In one embodiment of the present invention, a baffle rod 4 is installed on both the top and bottom walls of the windbreak plate 2, and the baffle rod 4 is provided with at least one baffle strip 401 arranged spirally along the baffle rod 4.

[0023] In this scheme, the wind blowing towards the wind deflector 4 can be disrupted by the deflector strip 401, preventing it from forming a stable frequency vortex and thus suppressing vortex-induced vibration; and the wind force from the side wall of the steel box girder 1 is broken by the tip 202 and blown towards the wind deflector 4 by the streamlined side plate 201, further disrupting the trajectory of the wind from the side wall of the steel box girder 1.

[0024] In one embodiment of the present invention, a gap is provided between the mounting plate 203 and the side plate 201.

[0025] In this plan, such as Figure 4 The air separated by the tip 202 can flow through the gap between the lower mounting plate 203 and the side plate 201 to the side plate 201 and then through the gap between the upper mounting plate 203 and the side plate 201 to the spoiler bar 4.

[0026] In one embodiment of the present invention, the air-breaking plate 2 has a cavity, a rotating shaft 204 is installed on the air-breaking plate 2, the first end of the side plate 201 is rotatably installed on the rotating shaft 204, a driving cylinder 205 is installed in the air-breaking plate 2, the output end of the driving cylinder 205 is connected to the second end of the side plate 201, and the side plate 201 can be rotated around the rotating shaft 204 by the driving cylinder.

[0027] In this plan, such as Figure 4 By adjusting the included angle between the two side plates 201 through the drive cylinder 205, so that the rotating shaft 204 serves as the tip 202, when the side plate 201 rotates, the wind-breaking component 3 is driven to rotate synchronously with the side plate 201 through the mounting plate 203, so that different tilt angles of the side plate 201 can be adjusted according to different wind forces.

[0028] In one embodiment of the present invention, the side plate 201 and the wind-breaking plate 2 are fixedly connected as a whole, the two side plates 201 are symmetrically arranged about the tip 202, the side plate 201 is streamlined so that multiple wind-breaking plates 2 are spliced ​​into a wave shape, the wind-breaking component 3 includes multiple wind-breaking rods 303 connected by universal couplings 302, and multiple fan blades 301 are circumferentially installed on the wind-breaking rods 303 with the axis of the wind-breaking rods 303 as the center.

[0029] In this plan, such as Figure 1-3 The side plate 201 is set to a streamlined shape. Under this setting, the side plate 201 cannot rotate. Multiple air-breaking plates 2 are spliced ​​into a wave shape. When the wind blows onto the air-breaking component 3, since the side plate 201 is streamlined, the air-breaking component 3 is also arranged along the streamlined side plate 201. When one of the air-breaking rods 303 rotates, it can drive the other air-breaking rods 303 on the same group of air-breaking components 3 to rotate synchronously through the universal coupling 302. This allows the air-breaking components 3 in the same group to rotate synchronously when wind blows towards the air-breaking rods 3 from different directions.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A vibration damping device for a steel-concrete composite box girder bridge under vehicle-bridge coupling, comprising: A windbreak panel assembly installed on both sides of a steel box girder is characterized in that the windbreak panel assembly comprises multiple windbreak panels spliced ​​side by side, two side plates are installed on the side of the windbreak panel away from the steel box girder, the two side plates are inclined so that the connection between the two side plates forms a pointed tip, multiple self-rotating wind-breaking components are detachably installed on the side plates away from the steel box girder via mounting plates, the multiple wind-breaking components are arranged along the side plates, and multiple fan blades are installed circumferentially around the axis of the wind-breaking component; a baffle rod is installed on the top and bottom walls of the windbreak panel, and the baffle rod is provided with at least one baffle strip arranged spirally along the baffle rod; mounting plates are installed at both ends of the side plates, the wind-breaking component is installed between the two mounting plates, and a gap is provided between the mounting plate and the side plate so that the air broken through the pointed tip can flow to the wind-breaking component through the gap between the mounting plate and the side plate near the pointed tip and flow to the baffle rod through the gap between the mounting plate and the side plate away from the pointed tip.

2. The vibration damping device for steel-concrete composite box girder bridges under vehicle-bridge coupling as described in claim 1, characterized in that: The air-breaking plate has a cavity inside, and a rotating shaft is installed on the air-breaking plate. The first end of the side plate is rotatably mounted on the rotating shaft. A driving cylinder is installed inside the air-breaking plate. The output end of the driving cylinder is connected to the second end of the side plate. The side plate can be rotated around the rotating shaft by the driving cylinder.

3. The vibration damping device for steel-concrete composite box girder bridges under vehicle-bridge coupling as described in claim 1, characterized in that: The side plate and the wind-breaking plate are fixedly connected as a whole. The side plate is streamlined so that multiple wind-breaking plates are spliced ​​into a wave shape. The wind-breaking component includes multiple wind-breaking rods connected by universal couplings. Multiple fan blades are installed circumferentially on the wind-breaking rods with the wind-breaking rod axis as the center.

4. The vibration damping device for steel-concrete composite box girder bridges under vehicle-bridge coupling as described in claim 3, characterized in that: The two side plates are symmetrically arranged about the tip.

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