A movable flow splitting system for improving wind resistance of a double-box girder bridge

Abstract

The application discloses a movable flow distribution system for improving wind resistance of a double-box girder bridge, which comprises two opposite parallel box girders, a cross beam arranged between the two box girders, a longitudinal roller arranged at a middle position of the cross beam, a vortex baffle rotatably arranged on the longitudinal roller in a vertical direction, horizontal wing plates arranged at wind nozzles of outer ends of the two box girders respectively, and a plurality of rolling balls movably arranged on the cross beam in a length direction of the cross beam and each containing damping particles. The movable flow distribution system ingeniously integrates the horizontal wing plates, the vortex baffle and the rolling balls containing the damping particles, and the three are fused to make up for their respective shortcomings, and the integrated movable flow distribution system meets different wind vibration (static wind instability, flutter and vortex vibration) resistance requirements, thereby improving the overall wind resistance of the bridge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge structure, in particular to a movable flow separation system for improving wind resistance of double-box girder bridge. BACKGROUND

[0002] Compared with closed-box girder, double-box girder bridge has better flutter performance and becomes a popular main girder section of super-long span bridge, but it may have vortex vibration and static wind stability problems, in order to improve the overall wind resistance of super-long span double-box girder bridge, effective wind vibration control measures need to be taken to further improve the vortex vibration and flutter performance of double-box girder.

[0003] The existing bridge wind vibration suppression measures can be divided into three categories: aerodynamic measures, structural measures and mechanical measures. The commonly used fixed aerodynamic measures include horizontal wing plates and slotted vortex shedding plates. The horizontal wing plates are arranged at the wind nozzle to change the generation of vortex at the wind nozzle, so as to change the airflow separation and reattachment on the top and bottom surfaces of the box girder, and the tail vortex condition. The horizontal flow separation plate of a certain length and angle can improve the flutter critical wind speed or the static wind instability critical wind speed. The slotted vortex shedding plate is arranged between the two box girders, and the slotted vortex shedding plate changes the wind permeability at the slotted position to change the movement track of the vortex at the slotted position, so as to reduce the vortex vibration amplitude. The vortex shedding plate with a certain wind permeability can suppress vortex vibration. However, the length, angle and other parameters of the fixed horizontal wing plate are sensitive to wind vibration control effect, and the position, angle and other parameters of the fixed vortex shedding plate are sensitive to wind vibration control effect. When acting alone, it is difficult to simultaneously meet the flutter, vortex vibration and static wind instability requirements of different shaped box girders. Mechanical measures include tuned mass damper (TMD), etc. Although TMD can effectively reduce the vortex vibration and flutter amplitude of long-span bridge, it is easy to maintain and simple in structure, but TMD has the disadvantages of strict space requirement, limited control frequency band and excessive sensitivity to external excitation. The existing bridge usually uses one of the above measures to improve the wind resistance of the bridge. However, no matter which measure is used, there will be certain defects, it is difficult to meet the wind resistance requirements of different forms of wind vibration (static wind instability, flutter, vortex vibration) of double-box girder bridge, and the overall wind resistance performance still needs to be further improved.

[0004] Therefore, the prior art still needs to be improved and improved. SUMMARY

[0005] In view of the shortcomings of the prior art, the purpose of the present application is to provide a movable flow separation system for improving the wind resistance of double-box girder bridge, which aims to solve the problem that the bridge in the prior art cannot meet the wind resistance requirements of different forms of wind vibration of double-box girder bridge, and the wind resistance performance still needs to be further improved.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows:

[0007] The first aspect, the embodiment of the present application provides a movable diversion system for improving the wind resistance of a double-box girder bridge, comprising:

[0008] Two opposite parallel box girders are provided with a cross beam between the two box girders, and a longitudinal roller is arranged at the midspan of the cross beam;

[0009] A vortex baffle is rotatably arranged on the longitudinal roller in the vertical direction;

[0010] Horizontal wing plates are arranged at the wind nozzles of the outer ends of the two box girders, respectively;

[0011] A plurality of rolling balls are movably arranged on the cross beam in the length direction of the cross beam, and each rolling ball is provided with damping particles.

[0012] As a further improved technical solution, the movable diversion system for improving the wind resistance of a double-box girder bridge further comprises:

[0013] A control module and a shaft are arranged, a plurality of horizontal wing plates are arranged at the wind nozzles of the outer ends of the two box girders, respectively, the plurality of horizontal wing plates on each box girder are connected into a foldable wing plate through a plurality of shafts, wherein the right end of each horizontal wing plate on the left box girder is fixedly connected with a shaft, the left end of each horizontal wing plate on the right box girder is fixedly connected with a shaft, each shaft is connected with the control module, and the control module is arranged on any box girder and used for controlling the rotation of the shaft and the horizontal wing plate fixedly connected with the shaft.

[0014] As a further improved technical solution, the movable diversion system for improving the wind resistance of a double-box girder bridge further comprises:

[0015] An inclined support and an elastic member are arranged below each foldable wing plate, the top side of each inclined support is kept horizontal, and the bottom side of each horizontal wing plate is connected with the top side of the inclined support below the horizontal wing plate through at least one elastic member.

[0016] As a further improved technical solution, the movable diversion system for improving the wind resistance of a double-box girder bridge further comprises:

[0017] Four displacement sensors are divided into two groups, one group of displacement sensors is symmetrically arranged on the left box girder and connected with the control module, the other group of displacement sensors is symmetrically arranged on the right box girder and connected with the control module, and the four displacement sensors are arranged along the central axis of the two box girders.

[0018] As a further improved technical solution, the rolling ball is in the shape of a hollow ring, and each rolling ball is sleeved on the cross beam.

[0019] As a further improved technical solution, the cross beam is provided with a plurality of cross beams, the plurality of cross beams are parallel to each other, and the two ends of each cross beam are connected to the opposite sides of the two box girders, respectively, a rotatable longitudinal roller is arranged between each two adjacent cross beams, and a vortex baffle is arranged on each longitudinal roller.

[0020] As a further improved technical solution, the longitudinal roller penetrates the vortex baffle along the central axis direction of the vortex baffle.

[0021] As a further improved technical solution, the cross section at the tuyere is triangular, and one end of the horizontal wing plate is connected to the top corner at the tuyere.

[0022] As a further improved technical solution, the longitudinal roller is rotatably arranged on the cross beam, the vortex baffle is fixedly arranged on the longitudinal roller, and the longitudinal roller is connected with the control module, and the control module can control the rotation of the longitudinal roller.

[0023] Compared with the prior art, the embodiment of the present application has the following advantages:

[0024] The embodiment of the present application provides a movable flow splitting system for improving the wind resistance performance of a double-box girder bridge, which comprises: two opposite parallel box girders, a cross beam arranged between the two box girders, a longitudinal roller arranged at the middle position of the cross beam, a vortex baffle rotatably arranged on the longitudinal roller in the vertical direction, a horizontal wing plate arranged at the tuyere at the outer end of each box girder, and a plurality of rolling balls movably arranged on the cross beam in the length direction of the cross beam, and each rolling ball contains damping particles. The movable flow splitting system in the present application ingeniously integrates the horizontal wing plate, the vortex baffle and the rolling ball containing damping particles, and after the three are combined, the deficiencies of each other are made up, the wind resistance requirements of different forms of wind vibration (static wind instability, flutter, vortex vibration) of the integrated movable flow splitting system are met, and the overall wind resistance performance of the bridge is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the movable flow splitting system for improving the wind resistance performance of the double-box girder bridge is provided.

[0026] Figure 2 The assembly structure diagram of the box girder end and the horizontal wing plate is provided.

[0027] Figure 3 The structure diagram of the bendable wing plate is provided.

[0028] Figure 4 The connection structure diagram between the two box girders is provided.

[0029] Figure 5 This is a top view of the connection structure between the two box girders in this invention;

[0030] Figure 6 This is a schematic diagram of the adjusted structure of a movable diversion system for improving the wind resistance of a double box girder bridge, provided by the present invention.

[0031] Figure 7 This is a schematic diagram of the first flow field distribution of the double box girder under the action of the movable flow splitting system in this invention;

[0032] Figure 8 This is a schematic diagram of the second flow field distribution of the double box girder under the action of the movable flow splitting system in this invention;

[0033] Figure 9 This is a schematic diagram of the assembly structure of the ball bearings and damping particles in this invention.

[0034] Figure 10 This is a schematic diagram of the structure of the ball bearings during their movement in this invention;

[0035] Figure 11 The present invention provides a schematic diagram of the principle structure of a movable diversion system for improving the wind resistance of a double box girder bridge.

[0036] In the diagram: 1. Box girder; 101. Air nozzle; 2. Crossbeam; 3. Longitudinal roller; 4. Vortex baffle; 5. Horizontal flange; 6. Ball bearing; 7. Damping particles; 8. Control module; 9. Rotating shaft; 10. Bendable flange; 11. Diagonal support; 12. Elastic element; 13. Displacement sensor. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] Example:

[0039] like Figures 1-11 As shown, the movable diversion system for improving the wind resistance of the double box girder bridge 1 includes: two box girders 1 arranged opposite each other, with a crossbeam 2 between the two box girders 1, and a longitudinal roller 3 on the crossbeam 2; a vortex-blocking plate 4, which is rotatably arranged vertically on the longitudinal roller 3; a horizontal wing plate 5, which is respectively provided at the wind nozzle 101 at the outer end of the two box girders 1; and a plurality of ball bearings 6, which are arranged in a row and movably arranged on the crossbeam 2 along the length direction of the crossbeam 2, and each ball bearing 6 is provided with damping particles 7.

[0040] As Figure 1 shown, in this embodiment, the movable flow splitting system includes two box girders 1, a cross beam 2 connecting the two box girders 1 at two ends, a longitudinal roller shaft 3 arranged on the cross beam 2 and perpendicular to the cross beam 2, a vortex baffle 4 rotatably arranged on the longitudinal roller shaft 3 in the vertical direction, and horizontal wings 5 arranged at the outer ends of the two box girders 1 respectively. When the wind speed is large, the main girder undergoes bending-torsional coupled motion or multi-directional motion, and under the action of multiple springs, the two horizontal wings 5 on the two sides move out of sync, changing the development and distribution of vortices at the horizontal wings 5 on the two sides of the double box girder, reducing the pressure difference between the upper and lower surfaces of the box girder, thereby reducing the aerodynamic force of the double box girder and effectively increasing the flutter critical wind speed or static wind instability critical wind speed. When the wind speed is low, the main girder undergoes vertical or torsional single-degree-of-freedom vortex-induced resonance, and under the action of multiple springs, the horizontal wings 5 also move vertically or torsionally in sync, changing the development and distribution of vortices at the horizontal wings 5 on the two sides of the double box girder, thereby changing the vortex motion frequency and effectively reducing the vortex amplitude. When the wind speed is large, the vortex baffle 4 moves and rotates greatly with the wind, which can continuously disrupt the formation and development of large vortices at the slots, thereby reducing the aerodynamic force of the double box girder, and on the other hand, adjusting the movement range of the rolling balls 6. When the rolling balls 6 slide back and forth, they will drive the damping particles 7 to move, and the damping particles 7 can eliminate and reduce the large vibration amplitude of the box girder 1 by vibration and mutual collision energy dissipation, thereby doubling the flutter critical wind speed or static wind instability critical wind speed. When the wind speed is low during vortex locking, the vortex baffle 4 only rotates with the wind, which can reduce the vortex amplitude and suppress vortex. The rotation angle of the vortex baffle 4 is used to change the wind permeability of the slots of the two box girders 1, change the vortex motion trajectory, thereby changing the vortex motion frequency, and on the other hand, adjust the movement range of the rolling balls 6. When the rolling balls 6 vibrate vertically or rotate, they will drive the damping particles 7 to move, so that the damping particles 7 collide with each other to vibrate and dissipate energy, thereby reducing the amplitude of the vortex of the box girder 1. The movable flow splitting system in the present application ingeniously integrates the horizontal wings 5, the vortex baffle 4, and the rolling balls 6 containing damping particles 7. After the three are fused, they make up for their own shortcomings, and the integrated movable flow splitting system meets the wind resistance requirements of different forms of wind vibration (static wind instability, flutter, vortex, and buffeting), thereby improving the overall wind resistance performance of the bridge.

[0041] As Figures 2-3As shown, as a further solution, the movable flow splitting system for improving the wind resistance of the double-box girder 1 bridge further comprises a control module 8 and a rotating shaft 9; a plurality of horizontal flaps 5 are arranged at the wind nozzles 101 of the outer ends of the two box girders 1, and the plurality of horizontal flaps 5 on each box girder 1 are connected into a foldable flap 10 through a plurality of rotating shafts 9. In particular, the right end of each horizontal flap 5 on the left box girder 1 is fixedly connected with a rotating shaft 9, and the left end of each horizontal flap 5 on the right box girder 1 is fixedly connected with a rotating shaft 9. Each rotating shaft 9 is connected with the control module 8. The control module 8 is arranged on any of the box girders 1, for example, on the left box girder 1 or the right box girder 1, and is used to control the rotation of the rotating shaft 9 and the horizontal flap 5 fixedly connected therewith. Figure 2 On the left box girder 1, from left to right, the right end of the first horizontal flap 5 is fixedly connected with a rotating shaft 9, the rotating shaft 9 is rotatably connected with the left end of the second horizontal flap 5, that is, the rotating shaft 9 can rotate around the second horizontal flap 5, the right end of the second horizontal flap 5 is fixedly connected with a rotating shaft 9, the rotating shaft 9 is rotatably connected with the left end of the box girder 1, and the two rotating shafts 9 are connected with the control module 8. The control module 8 can control the angle of each horizontal flap 5 by controlling the rotation of the rotating shaft 9, and can also control the horizontal flaps 5 to overlap by rotating the rotating shaft 9 by 180 degrees, thereby reducing the extension length of the foldable flap 10. The angle and extension length of different horizontal flaps 5 will change the formation and development of the vortex at this position, thereby changing the vortex distribution around the entire double-box girder, reducing the pressure distribution and vortex motion frequency on the upper and lower surfaces of the box girder 1, and thereby reducing the aerodynamic force, improving the critical flutter wind speed, or improving the critical wind speed of static wind instability, or reducing the vortex vibration amplitude.

[0042] As a further solution, the movable flow splitting system for improving the wind resistance of the double-box girder 1 bridge further comprises inclined supports 11 and elastic members 12, each of the bendable wing plates 10 is provided with an inclined support 11 below, and the top side of each of the inclined supports 11 is kept horizontal, and the bottom side of each of the horizontal wing plates 5 is connected to the top side of the inclined support 11 below through at least one elastic member 12. Specifically, the bottom side of each of the horizontal wing plates 5 is provided with two elastic members 12 respectively, and a plurality of inclined supports 11, for example 5, 10, 20, …, are arranged below each of the horizontal wing plates 5, the top side of each of the inclined supports 11 is provided with two elastic members 12 and connected to the bottom side of the horizontal wing plate 5 through the elastic members 12, the elastic members 12 are tension springs or dampers, when the box girder 1 has vertical movement, the horizontal wing plate 5 and the inclined support 11 will have different vertical movements, when the box girder 1 has torsional movement, the horizontal wing plate 5 and the inclined support 11 will have different torsional movements; the relative movement of the two reduces the movement of the box girder 1 through the large movement of the horizontal wing plate 5 and the energy dissipation of the elastic member 12, thereby increasing the flutter critical wind speed or static wind instability critical wind speed or reducing the vortex vibration amplitude of the box girder 1.

[0043] As Figures 4-6As shown, in the movable flow splitting system for improving the wind resistance performance of the double-box girder 1 bridge in the embodiment, four displacement sensors 13 are further included, the four displacement sensors 13 are divided into two groups, one group of displacement sensors 13 is symmetrically arranged on the left box girder 1 and connected with the control module 8, specifically at the left and right edges of the top surface of the left box girder 1, the other group of displacement sensors 13 is symmetrically arranged on the right box girder 1 and connected with the control module 8, specifically at the left and right edges of the top surface of the right box girder 1, and the four displacement sensors 13 are arranged along the central axes of the two box girders 1. The two displacement sensors 13 in each group cooperate with each other to detect the vertical, lateral and torsional displacement amplitudes of the box girder 1, the average value of the vertical displacements of the two displacement sensors 13 is the vertical displacement amplitude of the box girder 1, and the torsional displacement amplitude of the box girder 1 is calculated by dividing the vertical displacement difference of the two displacement sensors 13 by the distance between the two displacement sensors 13. The lateral displacement amplitude of the box girder 1 is calculated by measuring the horizontal lateral displacement difference of the two displacement sensors 13. In the embodiment, the control module 8 stores the data of the flutter, vortex-induced vibration and static wind instability performance of the box girder 1 bridge under different combinations of the length or angle of the horizontal wing plate 5 and the position or angle of the vortex suppression plate 4, as well as the optimal length or angle of the horizontal wing plate 5 and the optimal position or angle of the vortex suppression plate 4, that is, the control module 8 stores the motion indication signals corresponding to each data under different data, and each data can be obtained by wind tunnel test or CFD numerical calculation. The two groups of displacement sensors 13 can determine which motion among flutter, static wind instability or vortex-induced vibration according to the lateral, vertical and torsional displacements of the box girder 1, and feed back to the control module 8 the length and angle of the horizontal wing plate 5 with better flutter control or static wind instability control effect of the box girder 1, and the angle and position of the vortex suppression plate 4 with better vortex-induced vibration control effect; when the displacement sensor 13 monitors that the motion of the box girder 1 is vertical and torsional bending-torsional coupled flutter or three-direction displacement coupled static wind instability, the control module 8 is signaled to change the angle of each horizontal wing plate 5, the length and angle of the bendable wing plate 10 are adjusted to change the vortex formation at the wind nozzles of the two box girders 1, and the control module 8 is signaled to change the position of each vortex suppression plate 4, the position of the vortex suppression plate 4 is adjusted to change the vortex development through the slotted portions of the two box girders 1, so as to reduce the pressure difference between the upper and lower surfaces of the box girder 1 and the aerodynamic force of the box girder, thereby improving the flutter critical wind speed or static wind instability critical wind speed of the two box girders 1.When the displacement sensor 13 detects that the motion of the box girder 1 is a vertical or torsional single-degree-of-freedom vortex-induced vibration, it sends a signal to the control module 8 to change the rotation angle of each horizontal flange 5. By adjusting the rotation angle of the bendable flange 10, it changes the formation of large vortices at the vortex nozzles of the two box girders 1. Then, it sends a signal to the control module 8 to change the rotation angle of each vortex-isolating plate 4. By adjusting the position and angle of the vortex-isolating plate 4, it destroys or breaks up some vortices between the slots of the two box girders 1, thereby reducing the formation and development of large vortices around the box girder 1, changing the vortex motion frequency, thereby reducing the amplitude of vortex-induced vibration of the two box girders 1, or even eliminating vortex-induced resonance.

[0044] like Figures 7-8 As shown, Figure 7 This is a schematic diagram of the flow field distribution of the double box girder 1 after encountering wind, when the horizontal wing plate 5 is kept horizontal and the vortex baffle plate 4 is located in the middle in the movable flow splitting system of the present invention. It is obvious that there is a large vortex between the double box girder 1 before the adjustment of the movable flow splitting system. At this time, the flutter and vortex vibration of the double box girder 1 are relatively large. Figure 8 This is a schematic diagram of the flow field distribution of the double box girder 1 after encountering wind, after the horizontal wing plate 5 is kept tilted and the vortex baffle plate 4 is rotated or horizontally displaced in the movable flow diversion system of the present invention. By adjusting the tilt angle of the horizontal wing plate 5 and changing the angle of the vortex baffle plate 4 or moving the vortex baffle plate 4 horizontally, the flow field distribution at the double box girder 1 is changed, which significantly eliminates the large vortex at the slot, divides the large vortex into multiple small vortices and disperses them in multiple places, thereby reducing vortex vibration and improving flutter.

[0045] like Figures 9-11 As shown, as a further embodiment, the ball bearing 6 is in the form of a hollow circular ring, and each ball bearing 6 is respectively sleeved on the crossbeam 2. The ball bearing 6 can rotate around the crossbeam 2 while moving laterally.

[0046] As a further solution, the cross beams 2 are provided in plurality, the plurality of cross beams 2 are parallel to each other, and two ends of each cross beam 2 are connected to opposite sides of two box girders 1 respectively. A rotatable longitudinal roller 3 is arranged between each two adjacent cross beams 2 respectively, and a vortex separation plate 4 is arranged on each longitudinal roller 3. Specifically, a plurality of cross beams 2, for example, 2, 3, 4, 5, or the like, are arranged side by side between the two box girders 1. A longitudinal roller 3 perpendicular to each cross beam 2 is rotatably connected to the cross beam 2. A vortex separation plate 4 is arranged on each longitudinal roller 3 respectively. When wind blows towards the box girders 1, the vortex separation plates 4 on the longitudinal rollers 3 rotate respectively. Meanwhile, the longitudinal rollers 3 arranged between each two adjacent cross beams 2 can also move horizontally on the cross beams 2, for example, by opening a sliding groove on the cross beam 2, so that the two ends of the longitudinal roller 3 are located in the sliding grooves of the two cross beams 2 respectively. Under the control of the control module 8, the longitudinal roller 3 can move horizontally to change the position of the vortex separation plate 4, so as to change the air permeability of the slotted part and the vortex distribution.

[0047] In the embodiment, the longitudinal roller 3 penetrates the vortex separation plate 4 along the central axis direction of the vortex separation plate 4, that is, the vortex separation plate 4 is divided into two equal parts by the longitudinal roller 3.

[0048] As a further solution, the cross section of the wind nozzle 101 is triangular, and one end of the horizontal wing plate 5 is connected to the top corner of the wind nozzle 101. The end of the outer end of the box girder 1 is triangular, which can change the vortex motion trajectory and reduce the aerodynamic force of the box girder 1.

[0049] As a further solution, the longitudinal roller 3 is rotatably arranged on the cross beam 2, the vortex separation plate 4 is fixedly arranged on the longitudinal roller 3, and the longitudinal roller 3 is connected to the control module 8. The control module 8 can control the rotation of the longitudinal roller 3. Specifically, the control module 8 can change the rotation angle of the longitudinal roller 3 to adjust the angle of the vortex separation plate 4, change the horizontal position of the longitudinal roller 3 to change the position of the vortex separation plate 4, so as to change the air permeability of the slotted part of the vortex separation plate 4, reduce the vortex generation and motion of the slotted part, and thus reduce the vortex amplitude. The angle and position of different vortex separation plates 4 change the motion trajectory of the large vortex of the slotted part, so as to change the distribution of the large vortex around the whole double box girder 1, and change the vortex motion frequency to reduce the vortex amplitude.

[0050] The main principle of the present application is as follows: under high wind speed, the horizontal wing plate 5 moves in multiple directions along with the two box girders 1, the vortex baffle 4 moves and rotates greatly, and the ball 6 also moves and rotates greatly, thereby changing the up-down aerodynamic force to control the flutter and static wind instability; under low wind speed, the horizontal wing plate 5 moves in one direction along with the two box girders 1, the vortex baffle 4 can only rotate, and the ball 6 moves and rotates slightly, thereby changing the vortex motion frequency to control the vortex vibration; when the control module 8 is needed, under high wind speed, the length and rotation angle of the horizontal wing plate 5 and the position of the vortex baffle 4 are changed to control the flutter and static wind instability; under low wind speed, the rotation angle of the horizontal wing plate 5, the position and angle of the vortex baffle 4 are changed to control the vortex vibration.

[0051] In summary, the embodiment of the present application provides a movable flow splitting system for improving the wind resistance performance of the double box girder 1 bridge, which comprises: two oppositely arranged box girders 1, a cross beam 2 is arranged between the two box girders 1, and a longitudinal roller 3 is arranged on the cross beam 2; a vortex baffle 4 is arranged on the longitudinal roller 3 in a vertically rotatable manner; a horizontal wing plate 5 is arranged at the wind nozzle 101 of the outer end of the two box girders 1; a plurality of balls 6 are movably arranged on the cross beam 2 in the length direction of the cross beam 2, and each ball 6 is provided with damping particles 7. The movable flow splitting system in the present application ingeniously integrates the horizontal wing plate 5, the vortex baffle 4 and the ball 6 containing the damping particles 7, and after the three are fused, the deficiencies of each other are made up, and the integrated movable flow splitting system meets the wind resistance requirements of different forms of wind vibration (static wind instability, flutter, vortex vibration), thereby improving the overall wind resistance performance of the bridge.

[0052] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0053] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0054] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixing", and the like are to be construed in a broad sense, for example, they can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection via an intermediate medium; can be internal connection of two elements, or interaction between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0056] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0057] Of course, the above description of the embodiments of the present application is more detailed, but it cannot be understood as a limitation on the protection scope of the present application. The present application can have other various implementations. Based on the present implementation, other implementations obtained by those skilled in the art without any creative labor are within the scope of protection of the present application. The protection scope of the present application is subject to the appended claims.

Claims

1. A movable flow splitting system for improving the wind resistance of a twin box girder bridge, characterized in that, The utility model relates to a kind of wind-resistant box girder, including: Two opposite parallel box girders, transverse beams are arranged between the two box girders, longitudinal rollers are arranged at the span center position of the transverse beams; Vortex baffle, the vortex baffle is rotatably arranged on the longitudinal roller in vertical direction; Horizontal wing plate, the wind nozzle at the outer end of the two box girders is respectively provided with the horizontal wing plate; A plurality of rolling balls, the rolling ball is hollow annular, each rolling ball is arranged on the transverse beam in row along the length direction of the transverse beam, and damping particles are arranged in each rolling ball; The transverse beam is provided with a plurality of, the plurality of transverse beams are parallel to each other, and the two ends of each transverse beam are respectively connected to the opposite sides of the two box girders, a rotatable longitudinal roller is arranged between each two adjacent transverse beams, and a vortex baffle is arranged on each longitudinal roller, and the longitudinal roller penetrates the vortex baffle along the central axis of the vortex baffle; When the wind speed is large, the vortex baffle moves and rotates greatly with the wind, which continuously breaks and develops the large vortex at the slot of the box girder, thereby reducing the aerodynamic force of the double box girder, and on the other hand, the moving range of the rolling ball is adjusted, the rolling ball moves back and forth to drive the damping particles to move, and the damping particles eliminate and reduce the large vibration amplitude of the box girder by vibration and mutual collision during movement, thereby double improving the flutter critical wind speed or static wind instability critical wind speed; When the vortex vibration is locked at low wind speed, the vortex baffle only rotates with the wind to reduce the amplitude of vortex vibration and suppress vortex vibration, and the rotation angle of the vortex baffle is used to change the wind permeability of the two slots of the box girder, change the vortex motion trajectory of the slot, change the vortex motion frequency, and on the other hand, the moving range of the rolling ball is adjusted, the rolling ball vibrates or rotates to drive the damping particles to move, so that the damping particles collide with each other to vibrate and dissipate energy, thereby double reducing the amplitude of vortex vibration of the box girder.

2. The movable flow dividing system for improving wind resistance performance of a double-box girder bridge according to claim 1, characterized in that, Further including: Control module and rotating shaft; The wind nozzle at the outer end of the two box girders is respectively provided with a plurality of horizontal wing plates, and the plurality of horizontal wing plates on each box girder are connected to form a foldable wing plate through a plurality of rotating shafts, wherein the right end of each horizontal wing plate on the left box girder is fixedly connected to a rotating shaft, the left end of each horizontal wing plate on the right box girder is fixedly connected to a rotating shaft, and each rotating shaft is connected with the control module, and the control module is arranged on any box girder to control the rotation of the rotating shaft and the horizontal wing plate fixedly connected thereto.

3. The movable flow dividing system for improving wind resistance performance of a twin-box girder bridge according to claim 2, characterized in that, Further including: Inclined support and elastic element, each foldable wing plate is respectively provided with an inclined support below, and the top side of each inclined support is kept horizontal, and the bottom side of each horizontal wing plate is connected to the top side of the inclined support below through at least one elastic element.

4. The movable flow dividing system for improving wind resistance performance of a twin-box girder bridge according to claim 3, characterized in that, Further including: Four displacement sensors, the four displacement sensors are divided into two groups, one group of displacement sensors is symmetrically arranged on the left box girder and connected with the control module, the other group of displacement sensors is symmetrically arranged on the right box girder and connected with the control module, and the four displacement sensors are arranged along the central axis of the two box girders.

5. The movable flow dividing system for improving wind resistance performance of a twin-box girder bridge according to claim 1, wherein The cross section at the tuyere is triangular, and one end of the horizontal wing plate is connected with the top corner at the tuyere.

6. The movable flow dividing system for improving wind resistance performance of a twin-box girder bridge according to claim 2, wherein The longitudinal roller is rotatably arranged on the cross beam, the vortex baffle is fixedly arranged on the longitudinal roller, and the longitudinal roller is connected with the control module. The control module can control the rotation of the longitudinal roller.

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