A wind blocking device capable of effectively inhibiting vortex-induced vibration of split box girder and a method of using the same

Abstract

The application provides a wind shielding device which can effectively inhibit the vortex-induced vibration of a split box girder. At a certain wind speed, the amplitudes of wind-induced vibration of the main girder caused by wind shielding plates in different directions are different. By rotating the wind shielding device, the incoming flow wind can be blocked, so as to change the flow field around the main girder and improve the vortex vibration effect of the main girder. By rotating the wind shielding device, the height of the wind shielding plate can be reduced, that is, the two resistance increasing plates which are perpendicular to the wind shielding plate at the same wind speed can enhance the wind resistance effect and form a local backflow of the incoming flow wind. The wind shielding device is simple and easy to control. By simply rotating the wind shielding plate, a better wind-induced vibration inhibition effect can be obtained, and the input energy is small.

Description

Technical Field

[0001] This application relates to the field of bridge wind resistance technology, specifically to a windbreak device that can effectively suppress vortex-induced vibration of a split box girder and its usage method. Background Technology

[0002] With the development of the times and society, short-span bridges can no longer meet the needs of economic development, and the adoption rate of long-span bridges is increasing. However, as the bridge span increases, wind-induced vibration phenomena such as vortex-induced vibration, flutter, and buffeting may occur. Due to its excellent flutter performance, split-type double box girders are increasingly being used in long-span bridges. However, split-type double box girders have poor vortex-induced vibration performance, and how to solve the vortex-induced vibration problem of split-type box girders has become a key research issue for many experts and scholars.

[0003] Aerodynamic measures and damping measures are two main methods for suppressing vortex-induced vibration of the main girder. Damping measures are extremely expensive to implement and maintain, while aerodynamic measures are less costly and costly. Therefore, aerodynamic measures are more economical and reasonable than damping measures. However, aerodynamic measures have poor adaptability, which will inevitably limit the development of bridges to higher and longer spans.

[0004] Therefore, there is an urgent need for a windbreak device that can effectively suppress vortex-induced vibration of bridges and its usage method. Summary of the Invention

[0005] In order to solve the technical problem of poor adaptability of the above-mentioned aerodynamic measures, this application provides a windbreak device and its usage method that can significantly improve the adaptability of ordinary windbreaks, improve the vortex-induced vibration performance of split double box girder bridges, and effectively suppress the vortex-induced vibration of split box girders.

[0006] A windbreak device for effectively suppressing vortex-induced vibration of a split box girder, wherein the split box girder includes two box girders and two crossbeams connected between the two box girders. The windbreak device includes an anti-vibration component perpendicular to the crossbeams. A drive motor is provided on the crossbeams to drive the anti-vibration component to rotate. When the box girder generates vortex-induced vibration, the drive motor drives the anti-vibration component to rotate to suppress the vortex-induced vibration.

[0007] The windbreak device described above, which can effectively suppress vortex-induced vibration of a split box girder, includes a windbreak plate in the shape of a long strip and connecting parts at both ends of the windbreak plate for connection with the drive motor. The drive motor can drive the connecting parts to rotate, thereby causing the windbreak plate to rotate.

[0008] The windbreak device described above, which can effectively suppress vortex-induced vibration of split box girders, includes a connecting member comprising a rotating disk that engages with the windbreak plate and a rotating shaft disposed on the rotating disk. One end of the rotating shaft is fixed on the rotating disk, and the other end passes through and is connected to the drive motor.

[0009] As described above, the windbreak device that can effectively suppress vortex-induced vibration of split box girders has a drag-increasing plate on both sides of the windbreak plate along its length, and the rotating disk has a groove on the side near the windbreak plate for the windbreak plate and the drag-increasing plate to fit together.

[0010] The windbreak device described above, which can effectively suppress vortex-induced vibration of split box girders, has an I-shaped cross-section for the windbreak plate and the two friction-increasing plates, and the groove is an I-shaped groove.

[0011] As described above, the windbreak device that can effectively suppress vortex-induced vibration of split box girders has a horizontally arranged friction plate.

[0012] As described above, the windbreak device that can effectively suppress vortex-induced vibration of split box girders has displacement sensors for detecting displacement information at the ends of both box girders away from the vibration-damping components.

[0013] As described above, the windbreak device can effectively suppress the vortex-induced vibration of the split box girder. The box girder is also equipped with an information processor for acquiring the displacement information of the displacement sensor. The information processor controls the rotation of the drive motor according to the acquired displacement information.

[0014] A method of using a windbreak device as described in any of the preceding claims, which can effectively suppress vortex-induced vibration of a split box girder, includes the following steps:

[0015] S1. Determine whether the box girder is experiencing vortex-induced vibration;

[0016] S2. When it is determined that the box girder is experiencing vortex-induced vibration, the drive motor drives the vibration-damping component to rotate in order to suppress the vortex-induced vibration.

[0017] S3. Determine whether the vortex-induced vibration of the box girder has been improved. If it is suppressed, the control of the split box girder section bridge is completed. If it is not suppressed, continue to send a signal to the drive motor to drive the vibration-damping component to rotate in order to suppress the vortex-induced vibration. Repeat this process until the vortex-induced vibration of the main beam of the split box girder section is suppressed, and then stop working.

[0018] Compared with the prior art, the beneficial effects of this application are as follows:

[0019] 1. This application provides a windbreak device that can effectively suppress vortex-induced vibration of a split box girder. Under a certain wind speed, the amplitude of wind-induced vibration of the main girder varies depending on the direction of the windbreak plate. By rotating the windbreak device, the incoming wind can be blocked, thereby changing the flow field around the main girder and improving the vortex-induced vibration effect of the main girder. By rotating the windbreak device, the height of the windbreak plate can be reduced. That is, at the same wind speed, the two drag-increasing plates perpendicular to the windbreak plate enhance the wind resistance effect and form a local backflow of the incoming wind. The windbreak device is simple and easy to control. By simply rotating the windbreak plate, a better effect of suppressing wind-induced vibration can be achieved, and the input energy is small.

[0020] 2. The windbreak device provided in this application can effectively suppress vortex-induced vibration of a split box girder. The method of using the windbreak device can suppress the vortex-induced vibration of the split box girder by collecting bridge displacement information of the split box girder cross section through displacement sensor, then transmitting it to information processor, and achieving the effect of suppressing vortex-induced vibration of the split box girder by rotating the windbreak device. It is simple to operate, highly automated, requires no manual operation, is easy to control, and can achieve better suppression of wind-induced vibration by simply rotating the windbreak plate, with low input energy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0022] Figure 1 This is a three-dimensional schematic diagram of the windbreak device that can effectively suppress vortex-induced vibration of a split box girder and the assembly of the box girder.

[0023] Figure 2 This is a cross-sectional view of the box girder for a windbreak device that can effectively suppress vortex-induced vibration of a split box girder according to this application.

[0024] Figure 3 This is an exploded view of a windbreak device that can effectively suppress vortex-induced vibration of a split box girder according to this application. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figure 1-3 As shown, a windbreak device that can effectively suppress vortex-induced vibration of a split box girder includes a box girder 1, a vibration damping device 2, a drive motor 3, a windbreak plate 20, a connector 21, a displacement sensor 4, an information processor 5, and a groove 6.

[0027] A windbreak device for effectively suppressing vortex-induced vibration of a split box girder is disclosed. The split box girder includes two box girders 1 and two crossbeams 10 connected between the two box girders 1. The windbreak device includes an anti-vibration component 2 perpendicular to the crossbeams 10. A drive motor 3 is provided on each crossbeam 10 to drive the anti-vibration component 2 to rotate. When the box girder 1 experiences vortex-induced vibration, the drive motor 3 drives the anti-vibration component 2 to rotate to suppress the vortex-induced vibration. By setting up the anti-vibration device, under a certain wind speed, the windbreaks in different directions have different amplitudes of wind-induced vibration on the main girder. By rotating the windbreaks, the incoming wind can be blocked, thereby changing the flow field around the main girder and improving the vortex-induced vibration effect of the main girder. By rotating the windbreaks, the height of the windbreaks can be reduced. That is, at the same wind speed, the two crossbeams perpendicular to the windbreaks enhance the wind resistance effect and form a local backflow for the incoming wind. The windbreak device is simple and easy to control. By simply rotating the windbreaks, a better effect of suppressing wind-induced vibration can be achieved with less energy input.

[0028] Preferably, the vibration-damping component 2 includes a long strip-shaped windbreak plate 20 and connectors 21 located at both ends of the windbreak plate 20 for connection with the drive motor 3. The drive motor 3 can drive the connectors 21 to rotate, thereby causing the windbreak plate 20 to rotate. By setting the drive motor connectors to connect with the windbreak plate, the self-adaptive capability of the ordinary windbreak plate is improved. By adjusting the direction of the windbreak plate, the vortex-induced vibration performance of the split double box girder bridge is improved.

[0029] Preferably, the connecting member 21 includes a rotating disk 211 that engages with the wind deflector 20 and a rotating shaft 212 disposed on the rotating disk 211. One end of the rotating shaft 212 is fixed on the rotating disk 211, and the other end passes through the drive motor 3 and is connected to it.

[0030] Preferably, the wind deflector 20 is provided with drag-increasing plates 201 on both sides along its length. The rotating disk 211 is provided with a groove 6 on the side near the wind deflector 20, which allows the wind deflector 20 and the drag-increasing plates 201 to be inserted into each other. By setting the drag-increasing plates, the height of the wind deflector can be reduced. That is, at the same wind speed, the drag-increasing plates perpendicular to the wind deflector enhance the wind resistance effect, which provides a good effect on suppressing the vortex-induced vibration of the bridge.

[0031] Preferably, the cross-section of the wind deflector 20 and the two resistance-increasing plates 201 is I-shaped, and the groove 6 is an I-shaped groove. By setting the I-shaped groove, it can cooperate with the resistance-increasing plate and the wind deflector to fix and connect, thereby increasing the stability of the structure.

[0032] Preferably, the drag-increasing plate 201 is arranged horizontally. By setting the drag-increasing plate to be arranged horizontally, the stability of the structure can be increased, and the effect of suppressing wind-induced vibration can be better obtained. In addition, the two horizontal plates enhance the wind resistance effect and form a local backflow for the incoming airflow.

[0033] Preferably, each of the two box girders 1 is provided with a displacement sensor 4 for detecting displacement information at the end away from the vibration-damping component 2. By setting the displacement sensor, the vertical and torsional vortex vibration of the main beam can be detected at all times.

[0034] Preferably, the box girder 1 is further provided with an information processor 5 for acquiring displacement information of the displacement sensor 4, and the information processor 5 controls the drive motor 3 to rotate according to the acquired displacement information.

[0035] A method of using a windbreak device as described in any of the preceding claims, which can effectively suppress vortex-induced vibration of a split box girder, includes the following steps:

[0036] S1. Determine whether the box girder 1 generates vortex-induced vibration. More preferably, when the displacement sensor 4 collects bridge displacement information of the split box girder section, it transmits the displacement information to the information processor 5.

[0037] S2. When it is determined that the box girder 1 is generating vortex-induced vibration, the drive motor 3 drives the anti-vibration component 2 to rotate to suppress vortex-induced vibration. More preferably, the information processor 5 processes the data and, after determining that the bridge is generating vortex-induced vibration, sends information to control the drive motor 3 to rotate. The left box girder and the right box girder send rotation signals at the same speed but in opposite directions.

[0038] S3. Determine whether the vortex-induced vibration of the box girder 1 has been improved. If it is suppressed, the control of the split box girder section bridge is completed. If it is not suppressed, the information processor 5 continues to send a signal to the drive motor 3 to drive the vibration-damping component 2 to rotate to suppress the vortex-induced vibration. Repeat this process until the vortex-induced vibration of the main beam of the split box girder section is suppressed, and then stop working.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A windbreak device for effectively suppressing vortex-induced vibration of a split box girder, the split box girder comprising two box girders (1) and two crossbeams (10) connecting the two box girders (1), characterized in that: The windbreak device includes a vibration damping component (2) perpendicular to the two crossbeams (10). The crossbeams (10) are provided with a drive motor (3) that can drive the vibration damping component (2) to rotate. When the box girder (1) generates vortex-induced vibration, the drive motor (3) drives the vibration damping component (2) to rotate to suppress vortex-induced vibration. The vibration-damping component (2) includes a long strip-shaped windbreak plate (20) and connectors (21) located at both ends of the windbreak plate (20) for connecting to the drive motor (3). The drive motor (3) can drive the connectors (21) to rotate so as to drive the windbreak plate (20) to rotate. The connector (21) includes a rotating disk (211) that is engaged with the wind deflector (20) and a rotating shaft (212) disposed on the rotating disk (211). One end of the rotating shaft (212) is fixed on the rotating disk (211), and the other end passes through the drive motor (3) and is connected to it. The wind deflector (20) has resistance-increasing plates (201) on both sides along its length. The rotating disk (211) has a groove (6) on the side near the wind deflector (20) for the wind deflector (20) and the resistance-increasing plates (201) to fit together. The wind deflector (20) and the two resistance plates (201) have I-shaped cross-sections, and the groove (6) is an I-shaped groove.

2. The windbreak device for effectively suppressing vortex-induced vibration of a split box girder according to claim 1, characterized in that: The resistance-increasing plate (201) is arranged horizontally.

3. The windbreak device for effectively suppressing vortex-induced vibration of a split box girder according to claim 1, characterized in that: Both box girders (1) are equipped with displacement sensors (4) for detecting displacement information at the ends away from the vibration-damping components (2).

4. The windbreak device for effectively suppressing vortex-induced vibration of a split box girder according to claim 3, characterized in that: The box girder (1) is also equipped with an information processor (5) for acquiring displacement information of the displacement sensor (4), and the information processor (5) controls the drive motor (3) to rotate according to the acquired displacement information.

5. A method of using a windbreak device as described in any one of claims 1 to 4, which can effectively suppress vortex-induced vibration of a split box girder, characterized in that, Includes the following steps: S1. Determine whether the box girder (1) generates vortex-induced vibration; S2. When it is determined that the box girder (1) generates vortex-induced vibration, the drive motor (3) drives the anti-vibration component (2) to rotate to suppress vortex-induced vibration. S3. Determine whether the vortex-induced vibration of the box girder (1) has been improved. If it is suppressed, the control of the split box girder section bridge is completed. If it is not suppressed, continue to send a signal to the drive motor (3) to drive the vibration-damping component (2) to rotate to suppress the vortex-induced vibration. Repeat this process until the vortex-induced vibration of the main beam of the split box girder section is suppressed, and then stop working.

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