Anti-whirling and flutter device and split box girder bridge

Abstract

The application provides a vortex and flutter prevention device and a split box girder bridge, and relates to the technical field of bridges. The vortex and flutter prevention device is used for being installed between two adjacent split box girders, and comprises a vortex baffle, a fixing plate, a wind speed meter installed on the fixing plate, a control system and a driving system. The vortex baffle is rotationally connected with the fixing plate and has an initial state parallel to the fixing plate and a turnover state perpendicular to the fixing plate. The control system is signal connected with the wind speed meter and the driving system, and the wind speed meter is used for detecting wind speed. The driving system is transmission connected with the vortex baffle, so that the vortex baffle is switched from the initial state to the turnover state. The application solves the technical problem that the slotted box girder is prone to significant vortex-induced resonance.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to a device for preventing vortex-induced vibration and flutter, and a split-type box girder bridge. Background Technology

[0002] Due to their flexible structure, wind-induced vibrations gradually become the controlling load for long-span suspension bridges as the span increases. Currently, wind-induced vibrations in long-span bridges can be categorized into vortex-induced vibration, flutter, and buffeting. Vortex-induced vibration is a wind-induced vibration phenomenon that typically occurs at low wind speeds. The vibration of the structure creates a feedback effect on vortex shedding, and the aerodynamic damping gradually changes from negative to positive with the amplitude, thus limiting the amplitude and exhibiting a limited-amplitude vibration. Long-term, recurring vortex-induced vibration not only causes fatigue damage to the bridge but also significantly impacts the driving safety and comfort of long-span bridges. Flutter is a divergent vibration occurring at high wind speeds, involving a single degree of freedom in torsion or a coupled degree of freedom in bending and torsion. It belongs to the category of aeroelastic instability phenomena in bridges, and once it occurs, it can cause the collapse of the bridge structure, resulting in severe economic losses and even casualties. Buffet vibrations at driving wind speeds typically have smaller amplitudes than vortex-induced vibrations. Currently, bridge wind-resistant design mainly focuses on increasing the critical wind speed for flutter and limiting the amplitude of vortex-induced vibrations.

[0003] Currently, to achieve larger spans and ensure flutter resistance, long-span suspension bridges often employ slotted designs, resulting in slotted box girders exhibiting good flutter performance. However, slotted box girders are also prone to significant vortex-induced resonance. To ensure the vortex-induced vibration performance of slotted box girders, three main vibration suppression measures are employed: structural, mechanical, and aerodynamic measures, to reduce or eliminate potential vortex-induced vibration problems. Modifications to structural measures have the greatest impact on the aerodynamic performance of the bridge, but they are costly and cannot be adjusted for existing bridges. Mechanical measures can usually effectively control wind-induced vibrations without altering the structural system, but their high cost makes them less preferred in wind-resistant bridge design. Aerodynamic measures can reduce the wind-induced vibration response of bridges by appropriately modifying the bridge's shape or installing additional aerodynamic devices without changing the bridge's structure and performance. Due to their low cost and ease of operation, aerodynamic measures are the most widely used. However, for slotted box girders, traditional aerodynamic measures such as deflectors or stabilizing plates cannot completely eliminate vortex-induced vibration problems. Summary of the Invention

[0004] The purpose of this invention is to provide a device for preventing vortex-induced vibration and flutter, as well as a split box girder bridge, to alleviate the technical problem that slotted box girders in the prior art are prone to significant vortex-induced resonance.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, the anti-vortex vibration and flutter device provided by the present invention is used to be installed between two adjacent split box girders, including a vortex isolation plate, a fixing plate, and an anemometer, a control system and a drive system installed on the fixing plate;

[0007] The vortex baffle is rotatably connected to the fixed plate, and has an initial state parallel to the fixed plate and a flipped state perpendicular to the fixed plate.

[0008] The control system is signal-connected to the anemometer and the drive system, and the anemometer is used to detect wind speed.

[0009] The drive system is connected to the vortex baffle to switch the vortex baffle from the initial state to the flipped state.

[0010] Furthermore, the drive system includes a limiting component, a transmission component, and a support rod;

[0011] One end of the support rod is mounted on the fixed plate, and the limiting component and the transmission component are mounted on the support rod;

[0012] The transmission component is connected to the vortex barrier plate, and the limiting component is connected to the control system and is used to control the opening and closing of the transmission component.

[0013] Furthermore, the transmission assembly includes a drive element, a pull rope, and a pulley;

[0014] The pulley is fixed to the end of the support rod away from the fixed plate;

[0015] The pull rope passes around the pulley, with one end connected to the drive component and the other end connected to the vortex barrier. The limiting component is used to control the opening and closing of the drive component.

[0016] Furthermore, the transmission assembly also includes a guide rail;

[0017] The guide rail is mounted on the support rod and is arranged along the length of the support rod;

[0018] The driving component slides in conjunction with the guide rail.

[0019] Furthermore, the limiting assembly includes a motor, a gear, and a rack meshing with the gear;

[0020] The motor is connected to the gear to drive the gear to rotate;

[0021] The rack meshes with the gear, and the rack abuts against or separates from the transmission assembly to control the opening and closing of the transmission assembly.

[0022] Furthermore, the limiting component also includes a battery, which is electrically connected to the motor and signal-connected to the control system.

[0023] Furthermore, the fixed plate and the vortex-blocking plate are rotatably connected by a rotating shaft.

[0024] Furthermore, there are two drive systems, each connected to one of the two side walls of the vortex baffle.

[0025] Secondly, the split box girder bridge provided in the embodiments of the present invention includes multiple split box girders and anti-vortex vibration and flutter devices as described in any of the above.

[0026] Multiple split box girders are spaced apart along a first direction, and the anti-vortex vibration and flutter device is provided between two adjacent split box girders.

[0027] Furthermore, multiple anti-vortex vibration and flutter devices are provided between two adjacent split box girders, and the vortex isolation plates in the multiple anti-vortex vibration and flutter devices are spaced apart along a first direction or a second direction, wherein the second direction is perpendicular to the first direction.

[0028] Based on the above technical solutions, the technical effects achievable by this invention can be analyzed as follows:

[0029] The anti-vortex vibration and flutter device provided by the present invention is used for installation between two adjacent split box girders, including a vortex isolation plate, a fixed plate, and an anemometer, a control system, and a drive system mounted on the fixed plate; the vortex isolation plate is rotatably connected to the fixed plate and has an initial state parallel to the fixed plate and a flipped state perpendicular to the fixed plate; the control system is signal-connected to the anemometer and the drive system, the anemometer is used to detect wind speed; the drive system is drive-connected to the vortex isolation plate to switch the vortex isolation plate from the initial state to the flipped state. When this anti-vortex vibration and flutter device is installed, the fixed plate is parallel to the upper surface of the split box girder. In the initial state, the anti-vortex plate is parallel to the upper surface of the split box girder, filling the gap between two adjacent split box girders and preventing vortex vibration in the split box girder bridge. The anemometer measures the wind speed in real time. When the wind speed reaches the predetermined value, the control system controls the drive system to open, and the drive system drives the anti-vortex plate to rotate, switching from the initial state to a flipped state perpendicular to the fixed plate. When the anti-vortex plate is perpendicular to the fixed plate, it is perpendicular to the upper surface of the split box girder, creating a gap between two adjacent split box girders. This prevents the split box girder from collapsing due to flutter caused by the anti-vortex plate not opening in time during typhoons or other weather conditions. When the vortex-isolating plate is in its initial state, it can prevent vortex-induced vibration in split box girder bridges. When the vortex-isolating plate is in its flipped state, it can prevent flutter in split box girder bridges. Furthermore, because the control system is connected to the anemometer and the drive system signals respectively, the vortex-isolating plate can automatically flip, avoiding safety accidents such as collapse caused by flutter in split box girder bridges due to failure to open in time. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the anti-vortex and flutter device provided in an embodiment of the present invention from a first-view perspective;

[0032] Figure 2 A schematic diagram of the anti-vortex and flutter device provided in an embodiment of the present invention from a second perspective;

[0033] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0034] Figure 4 This is a structural schematic diagram of a split box girder bridge provided in an embodiment of the present invention.

[0035] icon:

[0036] 100-Vortex shield; 200-Fixing plate; 210-Rotating shaft; 300-Anemometer; 400-Control system; 510-Transmission assembly; 511-Drive component; 512-Pull rope; 513-Pulley; 514-Guide rail; 520-Limiting assembly; 521-Motor; 522-Gear; 523-Rack; 524-Battery; 525-Rain cover; 530-Support rod; 600-Split box girder; a-First direction; b-Second direction. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0044] Example 1

[0045] Existing slotted box girders are prone to vortex-induced resonance.

[0046] In view of this, the anti-vortex vibration and flutter device provided in this embodiment of the invention is used to be installed between two adjacent split box girders 600, including a vortex-blocking plate 100, a fixing plate 200, and an anemometer 300, a control system 400, and a drive system installed on the fixing plate 200; the vortex-blocking plate 100 is rotatably connected to the fixing plate 200, and has an initial state parallel to the fixing plate 200 and a flipped state perpendicular to the fixing plate 200; the control system 400 is signal-connected to the anemometer 300 and the drive system, and the anemometer 300 is used to detect wind speed; the drive system is drive-connected to the vortex-blocking plate 100 to switch the vortex-blocking plate 100 from the initial state to the flipped state. When the anti-vortex vibration and flutter device is installed, the fixed plate 200 is parallel to the upper surface of the split box girder 600. In its initial state, the vortex-blocking plate 100 is parallel to the upper surface of the split box girder 600, filling the gap between two adjacent split box girders 600 and preventing vortex vibration in the split box girder bridge. The anemometer 300 measures the wind speed in real time. When the wind speed reaches a predetermined value, the control system 400 controls the drive system to open, driving the vortex-blocking plate 100 to rotate, switching from the initial state to a flipped state perpendicular to the fixed plate 200. When the vortex-blocking plate 100 is perpendicular to the fixed plate 200, it is perpendicular to the upper surface of the split box girder 600, ensuring a gap between two adjacent split box girders 600. This prevents the split box girder 600 from collapsing due to flutter caused by the vortex-blocking plate 100 not opening in time during typhoons or other weather conditions. When the vortex-isolating plate 100 is in its initial state, it can prevent vortex-induced vibration in the split box girder bridge. When the vortex-isolating plate 100 is in its flipped state, it can prevent flutter in the split box girder bridge. Furthermore, because the control system 400 is connected to the anemometer 300 and the drive system signals respectively, the vortex-isolating plate 100 can be automatically flipped, thus preventing safety accidents such as collapse caused by flutter in the split box girder 600 bridge due to failure to open in time.

[0047] The structure and shape of anti-vortex and flutter devices are described in detail below:

[0048] In the optional solutions of the embodiments of the present invention, please refer to Figure 1 and Figure 2 The drive system includes a limit component 520, a transmission component 510, and a support rod 530. One end of the support rod 530 is mounted on the fixed plate 200, and the limit component 520 and the transmission component 510 are mounted on the support rod 530. The transmission component 510 is connected to the vortex shield 100 for transmission, and the limit component 520 is connected to the control system 400 for signal transmission and is used to control the opening and closing of the transmission component 510.

[0049] Specifically, the support rod 530 is perpendicular to the fixed plate 200, and the support rod 530 is fixedly connected to the fixed plate 200 to improve the connection strength between the two.

[0050] The support rod 530 provides support for the limiting component 520 and the transmission component 510; the transmission component 510 enables the vortex-blocking plate 100 to flip; the limiting component 520 is connected to the control system 400 and can control the opening and closing of the transmission component 510. When the transmission component 510 is closed, the vortex-blocking plate 100 is in the initial state. When the transmission component 510 is opened, the vortex-blocking plate 100 switches from the initial state to the flipped state, realizing the automatic flipping function of the anti-vortex vibration and flutter device.

[0051] In an optional embodiment of the present invention, the transmission assembly 510 includes a driving member 511, a pull rope 512, and a pulley 513; the pulley 513 is fixed to one end of the support rod 530 away from the fixed plate 200; the pull rope 512 passes around the pulley 513, with one end connected to the driving member 511 and the other end connected to the vortex baffle 100, and the limiting assembly 520 is used to control the opening and closing of the driving member 511.

[0052] Specifically, the pulley 513 has a groove, and the pull rope 512 is embedded in the groove. The two opposite sidewalls of the groove limit the pull rope 512 to prevent it from falling off the pulley 513. In this embodiment, the driving component 511 is a counterweight. When the anemometer 300 detects that the actual wind speed has reached the preset wind speed, the limiting component 520 unlocks the counterweight. The counterweight descends under its own weight, driving the pull rope 512 to move. The pull rope 512 pulls the vortex baffle 100 from the initial state to the flipped state. Of course, the drive component 511 may be configured with other structures, such as wrapping one end of the pull rope 512 around the outer circumference of the roller that cooperates with the motor, and the limiting component 520 controls the opening and closing of the motor. When the limiting component 520 locks the motor, the vortex plate 100 is in the initial state. When the limiting component 520 unlocks the motor, the motor rotates, driving the roller to rotate, increasing the number of pull ropes 512 wrapped around the roller. The vortex plate 100 switches from the initial state to the flipped state under the traction force of the pull ropes 512. This should also be within the protection scope of the embodiments of the present invention.

[0053] The driving component 511 is set as a counterweight, which uses the gravity of the counterweight to achieve the flipping of the vortex plate 100. The structure is simple and does not require additional power input.

[0054] In an optional embodiment of the present invention, the transmission assembly 510 further includes a guide rail 514; the guide rail 514 is mounted on the support rod 530 and is arranged along the length direction of the support rod 530; the driving member 511 is slidably engaged with the guide rail 514.

[0055] Specifically, in this embodiment, please refer to Figure 2 The counterweight is provided with a T-shaped groove, and the T-shaped groove extends along the length of the support rod 530; the guide rail 514 is inserted into the T-shaped groove and slides in cooperation with the T-shaped groove.

[0056] The guide rail 514 guides the counterweight, preventing unsafe conditions caused by the counterweight swaying in windy weather.

[0057] In an optional embodiment of the present invention, the limiting component 520 includes a motor 521, a gear 522, and a rack 523 meshing with the gear 522; the motor 521 is connected to the gear 522 to drive the gear 522 to rotate; the rack 523 meshes with the gear 522, and the rack 523 abuts against or separates from the transmission component 510 to control the opening and closing of the transmission component 510.

[0058] Specifically, in this embodiment, the motor 521 is a permanent magnet motor.

[0059] When the rack 523 is below the hammer, it supports the hammer and prevents it from falling, thus keeping the vortex baffle 100 in its initial state. When the motor 521 drives the gear 522 to rotate, the gear 522 drives the rack 523 to move, the hammer loses support and falls, and the vortex baffle 100 switches from the initial state to the flipped state.

[0060] In an optional embodiment of the present invention, the limiting component 520 further includes a rain cover 525, which is mounted on the support rod 530 and covers the motor 521.

[0061] For details, please see Figure 3 The rain cover 525 is designed as an arc shape that is recessed away from the motor 521, so that when rainwater or other droplets fall on its upper surface, the rainwater can slide off its upper surface and the rainwater or other droplets can be guided.

[0062] The rain cover 525 prevents the motor 521 from being exposed to rain, thus extending the service life of the motor 521.

[0063] In an optional embodiment of the present invention, the limiting component 520 further includes a battery 524, which is electrically connected to the motor 521 and signal-connected to the control system 400.

[0064] Specifically, the electricity generated by the rotation of the anemometer 300 is stored in the battery 524 through the control system 400. When the wind speed reaches the set value, the control system 400 supplies power to the permanent magnet motor through the battery 524, and controls the rack 523 to unlock the counterweight.

[0065] Battery 524 supplies power to permanent magnet motor. The rotation of permanent magnet motor drives gear 522 to rotate. Gear 522 drives rack 523 to move, thereby unlocking the counterweight.

[0066] In an optional embodiment of the present invention, the fixed plate 200 and the vortex-blocking plate 100 are rotatably connected by a rotating shaft 210.

[0067] Specifically, the fixed plate 200 is provided with a rotating shaft 210, the vortex baffle plate 100 is provided with a through hole, and the rotating shaft 210 is inserted into the through hole; or, the fixed plate 200 is provided with a through hole, the vortex baffle plate 100 is provided with a rotating shaft 210, and the rotating shaft 210 is inserted into the through hole.

[0068] The fixed plate 200 and the vortex baffle plate 100 are rotatably connected by the rotating shaft 210. The structure is simple and easy to install, disassemble or maintain.

[0069] In an optional embodiment of the present invention, two drive systems are provided, and the two drive systems are respectively connected to the two side walls of the vortex baffle 100.

[0070] Specifically, the anemometer 300 is positioned in the middle of the fixed plate 200. The electricity generated by the rotation of the anemometer 300 is stored in the battery 524 to meet the power requirements of the permanent magnet motor.

[0071] There are two drive systems, which are connected to the two side walls of the vortex baffle 100 respectively, so that when the vortex baffle 100 is flipped, the two side walls of the vortex baffle 100 are pulled at the same time to prevent the vortex baffle 100 from tilting.

[0072] Example 2

[0073] The split box girder bridge provided in this embodiment of the invention includes the anti-vortex vibration and flutter device described in Embodiment 1. Therefore, it also has all the beneficial effects of Embodiment 1, which will not be repeated here.

[0074] In an optional embodiment of the present invention, the split box girder bridge further includes multiple split box girders 600, which are spaced apart along a first direction a, and anti-vortex vibration and flutter devices are provided between two adjacent split box girders 600.

[0075] Specifically, please see Figure 4 When installing the anti-vortex vibration and flutter device, the length direction of the vortex isolation plate 100 can be set along the first direction a, or along the second direction b perpendicular to the first direction a.

[0076] A vortex-resistant and flutter-resistant device is installed between two adjacent split box girders 600. When the wind speed is low, the vortex-resistant and flutter-resistant device is in its initial state to fill the gap between the two adjacent split box girders 600 and avoid vortex-resistant vibration. When the wind speed is high, the vortex-resistant plate 100 is in a flipped state to create a gap between the two adjacent split box girders 600 and avoid flutter.

[0077] In an optional embodiment of the present invention, multiple anti-vortex vibration and flutter devices are provided between two adjacent split box girders 600, and the vortex isolation plates 100 in the multiple anti-vortex vibration and flutter devices are spaced apart along a first direction a or a second direction b, wherein the second direction b is perpendicular to the first direction a.

[0078] Specifically, when the length direction of the vortex baffle 100 is set along the second direction b, the plurality of vortex baffles 100 are spaced apart along the first direction a; when the length direction of the vortex baffle 100 is set along the first direction a, the plurality of vortex baffles are spaced apart along the second direction b.

[0079] Multiple anti-vortex vibration and flutter devices are installed between two adjacent split box girders 600, reducing the area of ​​each vortex isolation plate 100, thereby reducing the power required to drive the vortex isolation plate 100 to rotate, thus reducing the weight required for the counterweight, facilitating the installation of anti-vortex vibration and flutter devices, and avoiding safety hazards caused by excessive weight of the counterweight.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preventing vortex-induced vibration and flutter, for installation between two adjacent split box girders (600), characterized in that, include: Vortex baffle (100), fixed plate (200), and an anemometer (300), control system (400), and drive system mounted on the fixed plate (200); The vortex baffle (100) is rotatably connected to the fixed plate (200) and has an initial state parallel to the fixed plate (200) and a flipped state perpendicular to the fixed plate (200). The control system (400) is connected to the anemometer (300) and the drive system via signals. The anemometer (300) is used to detect wind speed. The drive system is connected to the vortex baffle (100) to switch the vortex baffle (100) from the initial state to the flipping state; The drive system includes a limiting component (520), a transmission component (510), and a support rod (530); One end of the support rod (530) is mounted on the fixing plate (200), and the limiting component (520) and the transmission component (510) are mounted on the support rod (530). The transmission assembly (510) is connected to the vortex shield (100) in a transmission connection, and the limiting assembly (520) is connected to the control system (400) in a signal connection and is used to control the opening and closing of the transmission assembly (510). The limiting component (520) includes a motor (521), a gear (522) and a rack (523) meshing with the gear (522). The motor (521) is connected to the gear (522) to drive the gear (522) to rotate; The rack (523) meshes with the gear (522), and the rack (523) abuts against or separates from the transmission assembly (510) to control the opening and closing of the transmission assembly (510); The limiting component (520) also includes a battery (524), which is electrically connected to the motor (521) and signal-connected to the control system (400); The electricity generated by the rotation of the anemometer is stored in the battery through the control system. The transmission assembly (510) includes a drive element (511), a pull rope (512), and a pulley (513). The pulley (513) is fixed to one end of the support rod (530) away from the fixed plate (200); The pull rope (512) passes around the pulley (513), with one end connected to the drive member (511) and the other end connected to the vortex baffle (100). The limiting component (520) is used to control the opening and closing of the drive member (511). When the wind speed reaches the predetermined value, the control system activates the drive system, which in turn drives the vortex-blocking plate to rotate, switching it from the initial state to a flipped state perpendicular to the fixed plate.

2. The anti-vortex vibration and flutter device according to claim 1, characterized in that, The transmission assembly (510) also includes a guide rail (514). The guide rail (514) is mounted on the support rod (530) and is arranged along the length direction of the support rod (530); The drive component (511) slides in conjunction with the guide rail (514).

3. The anti-vortex and flutter device according to claim 1 or 2, characterized in that, The fixed plate (200) and the vortex-blocking plate (100) are rotatably connected by a rotating shaft (210).

4. The anti-vortex and flutter device according to claim 1 or 2, characterized in that, There are two drive systems, each connected to one of the two side walls of the vortex baffle (100).

5. A split-type box girder bridge, characterized in that, It includes multiple split box girders (600) and anti-vortex vibration and flutter devices as described in any one of claims 1-4; Multiple split box girders (600) are spaced apart along a first direction (a), and the anti-vortex vibration and flutter device is provided between two adjacent split box girders (600).

6. The split-type box girder bridge according to claim 5, characterized in that, Multiple anti-vortex vibration and flutter devices are provided between two adjacent split box girders (600), and the vortex isolation plates (100) in the multiple anti-vortex vibration and flutter devices are spaced apart along a first direction (a) or a second direction (b), wherein the second direction (b) is perpendicular to the first direction (a).

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