Wind vibration suppression structure for separated double-amplitude box girder structure

Abstract

The invention belongs to the field of bridge engineering, and discloses a wind vibration suppression structure for a separated double-amplitude box girder structure, which comprises an upper cover plate and a lower cover plate, the top sealing device is located at the bottom of the upper cover plate, the two sides of the top sealing device are movably connected to the inner side of the box girder, and the top sealing device comprises a top sealing plate; and the driving device is connected with the top sealing plate to drive the top sealing plate to move in the length direction of the box girder so as to change the ventilation rate of the slotting area of the upper cover plate. The wind vibration suppression structure for the separated double-amplitude box girder structure comprises the upper cover plate and the lower cover plate which are both provided with the slotting areas, the area, covered by the top sealing plate, of the slotting areas is changed according to different weather conditions, so that the ventilation rate of the upper cover plate in the box girder is adjusted, and the wind vibration suppression structure is simple in structure, easy and convenient to install and low in overall cost.

Description

Technical Field

[0001] The present invention belongs to the field of bridge engineering, and particularly relates to a wind vibration suppression structure for a separated double-box girder structure. Background Art

[0002] When the air flow bypasses the bridge section, vortices that alternate and shed are generated on both sides and in the wake behind the section, causing periodic vortex-induced forces on the bridge section. When the vortex shedding frequency is close to a certain natural frequency of the structure, the structure may undergo vortex-induced vibration. Vortex-induced vibration generally occurs at relatively low wind speeds and is a type of amplitude-limited vibration with forced and self-excited properties, which will have a certain impact on the comfort and safety of driving. More complex vortex flows are likely to be generated inside the inner sides of the commonly used separated double-box girders of aerial railways, resulting in relatively large vortex-induced vibration phenomena. The commonly used vibration suppression measures for traditional box girder bridges are to install wind nozzles, flow deflectors, flow suppressors, etc.

[0003] Chinese Patent with the authorization announcement number CN108643019B discloses an integrated control device for bridge flutter and vortex-induced vibration. The bridge includes a split box girder composed of two polygon box girders symmetric along the midline and with outer wind nozzles. The control device includes retractable and rotatable upper and lower covers and a power device located inside the polygon box girder. The power device drives the upper and lower covers to retract or rotate. The upper and lower covers are installed on the inner sides of the opposite faces of the polygon box girders of the split box girder. A chute is provided inside the polygon box girder, and the upper and lower covers are retractably arranged in the chute; the upper and lower covers can retract relative to the polygon box girder; the upper and lower covers retract different lengths according to the wind force conditions, including retracting to completely enclose the split box girder and retracting to make the split box girder in a semi-closed state. However, in the case of relatively high wind speeds, since the upper and lower covers are only fixed at one end, the upper and lower covers are easily damaged; and the retractable plates need to be preset with grooves, and the power device is buried inside the box girder, making maintenance difficult. The box girder needs to conduct additional structural and pipeline designs for the positions where the mechanical devices are installed, resulting in high installation costs and reduced structural safety and stability.

[0004] Publication No. CN109898405A discloses an intelligent adjustable grille device and method for suppressing the wind vibration of a split box girder. The grille device includes: four telescopic grille components provided on the split box girder and a three-dimensional ultrasonic anemometer; each telescopic grille component includes: an electric roller located on the surface of the split box girder, a first vertical rod, a second vertical rod, and a telescopic grid. The electric roller is connected to the three-dimensional ultrasonic anemometer and is used to translate on the cross beam of the split box girder according to the wind speed and direction detected by the three-dimensional ultrasonic anemometer. The grid can be driven by the electric roller to extend towards the center of the central slot and cover the central slot to adjust the porosity of the central slot. However, in this solution, there are many details and parts to be controlled for the telescopic bridge grille structure, the design and manufacture are relatively complex, the maintenance is troublesome, and the bridge grille structure occupies a part of the bridge deck space, which may require an increase in the width of the bridge section. If a high porosity is to be achieved, the structure needs to be laid longitudinally across the entire box girder groove, resulting in a large amount of work. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies and defects in the background technology, and provide a wind vibration suppression structure for a separated double-box girder structure with high structural stability and safety and low cost.

[0006] To solve the above technical problem, the technical solution proposed by the present invention is: a wind vibration suppression structure for a separated double-box girder structure, the wind vibration suppression structure is arranged between two box girders, and includes: an upper cover plate and a lower cover plate both provided with a slotted area; A capping device located at the bottom of the upper cover plate and movably connected to the inner sides of the box girders at both sides, the capping device includes a capping plate; A driving device connected to the capping plate to drive the capping plate to move along the length direction of the box girder so as to change the air permeability of the slotted area of the upper cover plate.

[0007] In an embodiment, the driving device includes a motor and a gear connected to the motor, and both ends of the driving device are connected to the inner sides of the box girders.

[0008] In an embodiment, tracks are provided on the inner sides of both box girders. The capping device further includes connecting rods connected to both sides of the capping plate, a connecting plate connected to the connecting rods, and wheels provided at the ends of the connecting rods. The wheels are located at the tracks. A serrated portion meshing with the gear is provided at the bottom of the connecting plate. The capping device is driven to move along the tracks of the box girder by driving the gear to move by the motor.

[0009] In an embodiment, the slotted areas of the upper cover plate and the lower cover plate are symmetrically arranged. The capping plate has the same shape as the slotted area of the upper cover plate and an area greater than or equal to the area of the slotted area of the upper cover plate.

[0010] In one embodiment, there are multiple slotted areas on both the upper cover plate and the lower cover plate. The number of sealing top plates is the same as that of the slotted areas. The connecting plate is an integral structure in the length direction of the box girder. The number of sealing top plates is 1 to 3 times the number of driving devices. The connecting plate includes multiple serrated portions arranged at intervals. Each serrated portion corresponds to one motor, and the length of the serrated portion is greater than or equal to 1.2 times the length of the slotted area of the upper cover plate.

[0011] In one embodiment, both the upper cover plate and the lower cover plate are hinged to the box girder.

[0012] In one embodiment, it further includes a controller and a wind speed monitor for monitoring the wind speed. The controller controls the motor drive according to the monitored wind speed to change the area of the slotted area of the upper cover plate sealed by the sealing top plate.

[0013] In one embodiment, when the wind speed reaches the vortex-induced vibration wind speed, the sealing top plate seals all the slotted areas of the upper cover plate.

[0014] In one embodiment, the slotted shape is circular, elliptical, rhombic, triangular or rectangular.

[0015] In one embodiment, the sealing top plate is inclined, and the formed slope is 0.5% - 1.5%.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The wind vibration suppression structure of the present invention for the separated double - girder box girder structure includes an upper cover plate and a lower cover plate both provided with slotted areas. According to different climate conditions, the area of the slotted area covered by the sealing top plate is changed, so as to adjust the air permeability of the upper cover plate inside the box girder, thereby changing the air flow path inside the box girder, making the flow - around situation of the air flow more complex when passing through the inside of the box girder. Therefore, when the oncoming flow acts on the bridge section, it is difficult to form a large vortex shedding in the middle of the separated box girder. And after the air flow passes through the middle of the box girder, the flow - around situation is more complex, resulting in it being difficult to form vortex shedding at the trailing edge of the box girder on the leeward side. Therefore, the flow field situation in the longitudinal direction of the bridge is more complex, and the air flow generates an additional component in the longitudinal direction of the bridge, resulting in uneven distribution of the aerodynamic force received by the bridge along the longitudinal direction and the air flow being difficult to act on the bridge evenly and stably, thereby reducing the amplitude of wind - induced vibration and achieving the effect of vibration suppression, thus ensuring high structural stability and safety. Generally speaking, the wind vibration suppression structure of the present invention has a simple structure, is easy to install, and has a low overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a structural schematic diagram of a wind-induced vibration suppression structure for a separated double-box girder structure in an embodiment; Figure 2 It is a structural schematic diagram of a wind-induced vibration suppression structure for a separated double-box girder structure from another angle in an embodiment; Figure 3 It is a structural schematic diagram of a wind-induced vibration suppression structure for a separated double-box girder structure from another angle in an embodiment; Figure 4 It is a shape structural schematic diagram of a slotted area of a wind-induced vibration suppression structure for a separated double-box girder structure in an embodiment, where (a)-(d) are schematic diagrams of different slot shapes. Detailed implementation manners

[0019] For the convenience of understanding the present invention, the present invention will be described more comprehensively and in detail below in conjunction with the specification drawings and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0020] Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention.

[0021] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present invention can be obtained through the market or can be prepared by existing methods.

[0022] Please refer to Figures 1-4 , a wind-induced vibration suppression structure for a separated double-box girder structure, the wind-induced vibration suppression structure is arranged between two box girders 10, and includes: an upper cover plate 1, a lower cover plate 2, a capping device, and a driving device. The upper cover plate 1 and the lower cover plate 2 are both provided with a slotted area 3. The capping device is located at the bottom of the upper cover plate 1 and is movably connected to the inner sides of the box girders 10 at both sides. The capping device includes a capping plate 4. The driving device is connected to the capping plate 4 to drive the capping plate 4 to move along the length direction of the box girder 10 so as to change the air permeability of the slotted area 3 of the upper cover plate 1.

[0023] Specifically, in one embodiment, the upper cover plate 1 and the lower cover plate 2 are located on the upper side and the lower side of the middle cavity area between the two box girders 10. Preferably, both ends of the upper cover plate 1 and the lower cover plate 2 are hinged to the inner side of the box girder 10 to prevent the structures of the upper cover plate 1 and the lower cover plate 2 from having an adverse impact on the stress condition of the box girder 10. Preferably, the grooved areas 3 of the upper cover plate 1 and the lower cover plate 2 are symmetrically arranged. The sealing top plate 4 has the same shape as the grooved area 3 of the upper cover plate 1 and an area greater than or equal to that of the grooved area 3 of the upper cover plate 1, so that in necessary weather conditions, the sealing top plate 4 can completely seal the grooved area 3 of the upper cover plate 1. The grooved areas 3 of the upper cover plate 1 and the lower cover plate 2 are multiple and are evenly distributed on the upper cover plate 1 and the lower cover plate 2. The number of the sealing top plates 4 is the same as that of the grooved areas 3. The grooved shape is circular, oval, diamond-shaped, triangular or rectangular, which is convenient for processing and forming. Of course, in other embodiments, the shape of the grooved area 3 can also be selected as other different shapes according to needs.

[0024] Specifically, in one embodiment, the driving device includes a motor 8 and a gear 9 connected to the motor 8. Both ends of the driving device are connected to the inner side of the box girder 10. The capping device further includes connecting rods 5 connected to both sides of the sealing top plate 4, a connecting plate 6 connected to the connecting rods 5, and wheels 7 provided at the ends of the connecting rods 5. The wheels 7 are located at the tracks provided on the inner side of the box girder 10. The wheels 7 can be rollers or pulleys, preferably rollers. The bottom of the connecting plate 6 is provided with a serrated portion 61 meshing with the gear 9. The motor 8 drives the gear 9 to move, driving the capping device to move along the track of the box girder 10. That is, the driving device drives the serrated portion 61 of the connecting plate 6 meshing with it through the gear 9 to move, so that the wheels 7 roll in the track of the box girder 10, and thus the whole capping device moves. During the movement of the sealing top plate 4, it can seal part or all of the area of the grooved area 3 of the upper cover plate 1, realizing the change of the ventilation rate.

[0025] Preferably, in one embodiment, in order to simplify the construction process, the connecting plate 6 is an integral structure in the length direction of the box girder 10. The number of the sealing top plates 4 is 1-3 times the number of the driving devices, that is, the number of the sealing top plates 4 is 1-3 times the number of the motors 8. Specifically, it is determined according to the weight of the sealing top plate 4. Appropriately reducing the number of the driving devices according to the weight of the sealing top plate 4 can reduce the equipment cost and the installation cost. Further, in order to simplify the construction process, the bottom of the connecting plate 6 does not need to be entirely provided with the serrated portion 61, but includes multiple serrated portions 61 arranged at intervals. Each serrated portion 61 corresponds to one motor 8, and the length of the serrated portion 61 is greater than or equal to 1.2 times the length of the grooved area 3 of the upper cover plate 1, so as to simplify the construction and ensure that the sealing top plate 4 can completely seal the corresponding grooved area 3 of the upper cover plate 1.

[0026] In an embodiment, it further includes a controller and a wind speed monitor for monitoring the wind speed. The controller changes the area of the slotted area 3 of the upper cover plate 1 sealed by the sealing top plate 4 according to the monitored wind speed. The greater the wind speed, the larger the area of the slotted area 3 sealed by the sealing top plate 4. The controller issues an instruction to the motor 8 based on the wind speed monitored by the wind speed monitor. When there is no wind, the sealing top plate 4 is fixed below the non-slotted area of the upper cover plate 1; within a certain wind speed range, when the wind speed increases, it controls the sealing top plate 4 to gradually approach the slotted area 3, changing the size of the slotted area of the upper cover plate 1 to affect the airflow inside the box girder. The greater the wind speed, the more of the slotted area 3 of the upper cover plate 1 is sealed by the sealing top plate 4. When the wind speed reaches the wind speed at which the bridge vortex-induced vibration response is the largest, it controls the sealing top plate 4 to completely seal the slotted area 3 of the upper cover plate 1. After the wind speed is higher than the range where the bridge has vortex-induced vibration, the movable sealing top plate 4 can move away from the slotted area 3. The greater the wind speed, the less of the slotted area 3 of the upper cover plate 1 is sealed by the sealing top plate 4, so as to prevent the occurrence of bridge flutter. In relatively complex climatic conditions such as wind + rain or wind + snow, the position of the upper cover plate can be adjusted to reduce the impact of complex climatic conditions on the structural performance of the bridge. For example, in heavy rain or heavy snow, the slotted area 3 of the upper cover plate 1 is completely sealed by the sealing top plate 4 to block rain and snow from entering the inside of the cover plate, which may have an adverse impact on the structure. Preferably, in an embodiment, the sealing top plate 4 is inclined, and the formed slope is 0.5% - 1.5%. To prevent water from accumulating on its upper part.

[0027] Compared with the prior art, the wind-induced vibration suppression structure for the separated double-box girder structure of the present invention includes an upper cover plate 1 and a lower cover plate 2 both provided with slotted areas. According to different climatic conditions, the area of the slotted area covered by the sealing top plate is changed, thereby adjusting the air permeability of the upper cover plate 1 inside the box girder, and thus changing the airflow path inside the box girder, making the flow-around situation of the airflow more complex when passing through the inside of the box girder. Therefore, when the oncoming flow acts on the bridge section, it is difficult to form a large vortex shedding in the middle of the separated box girder. And after the airflow passes through the middle of the box girder, the flow-around situation is more complex, resulting in it being difficult to form vortex shedding at the trailing edge of the box girder on the leeward side. Therefore, the flow field situation in the longitudinal direction of the bridge is relatively complex, and the airflow generates an additional component in the longitudinal direction of the bridge, resulting in uneven distribution of the aerodynamic force received by the bridge along the longitudinal direction and making it difficult for the airflow to act on the bridge evenly and stably. Thereby, the amplitude of the wind-induced vibration is reduced, achieving the effect of vibration suppression, and thus ensuring high structural stability and safety. Generally speaking, the wind-induced vibration suppression structure of the present invention has a simple structure, is easy to install, and has a low overall cost.

Claims

1. A wind vibration suppression structure for a separated double-width box girder structure, the wind vibration suppression structure is arranged between two box girders, characterized in that: include: Both upper and lower covers are provided with slotted areas; A capping device is located at the bottom of the upper cover plate and is movably connected on both sides to the inner side of the box beam. The capping device includes a capping plate; The driving device is connected with the capping plate to drive the capping plate to move along the length direction of the box beam so as to change the air permeability of the slotted area of ​​the upper cover plate.

2. The wind vibration suppression structure for a separated double-width box girder structure according to claim 1 is characterized in that: The driving device comprises a motor and a gear connected to the motor, and two ends of the driving device are connected to the inner side of the box beam.

3. The wind vibration suppression structure for a separated double-width box girder structure according to claim 2 is characterized in that: Tracks are provided on the inner sides of the two box girders. The capping device also includes connecting rods connected to both sides of the capping plates, connecting plates connected to the connecting rods, and wheels arranged at the ends of the connecting rods. The wheels are located on the tracks. A serrated portion meshing with the gears is provided at the bottom of the connecting plates. The gears are driven by a motor to drive the capping device to move along the tracks of the box girder.

4. The wind vibration suppression structure for a separated double-width box girder structure according to claim 1 is characterized in that: The slotted areas of the upper cover plate and the lower cover plate are symmetrically arranged, the capping plate has the same shape as the slotted area of ​​the upper cover plate, and the area thereof is greater than or equal to the area of ​​the slotted area of ​​the upper cover plate.

5. The wind vibration suppression structure for a separated double-width box girder structure according to claim 4 is characterized in that: The upper cover plate and the lower cover plate are both provided with multiple slotted areas, the number of the capping plates is the same as the number of the slotted areas, the connecting plate is an integral structure in the length direction of the box beam, the number of the capping plates is 1-3 times the number of the driving devices, the connecting plate includes a plurality of sawtooth portions arranged at intervals, each sawtooth portion corresponds to a motor setting, and the length of the sawtooth portion is greater than or equal to 1.2 times the length of the slotted area of ​​the upper cover plate.

6. The wind vibration suppression structure for a separated double-width box girder structure according to claim 1 is characterized in that: The upper cover plate and the lower cover plate are both hinged to the box beam.

7. The wind vibration suppression structure for a separated double-width box girder structure according to claim 2 is characterized in that: It also includes a controller and a wind speed monitor for monitoring wind speed. The controller controls the motor drive according to the monitored wind speed to change the area of ​​the slotted area of ​​the upper cover plate sealed by the capping plate.

8. The wind vibration suppression structure for a separated double-width box girder structure according to claim 7 is characterized in that: When the wind speed reaches the vortex-vibration wind speed, the capping plate seals the entire slotted area of ​​the upper cover plate.

9. The wind vibration suppression structure for a separated double-width box girder structure according to claim 4 is characterized in that: The slot shape is circular, oval, diamond, triangular or rectangular.

10. The wind vibration suppression structure for a separated double-width box girder structure according to claim 1, characterized in that: The capping plate is inclined, and the formed slope is 0.5%-1.5%.

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