Bridge capable of improving vortex vibration and flutter stability of main beam

Abstract

The invention belongs to the technical field of bridges, and particularly provides a bridge capable of improving vortex vibration and flutter stability of a main beam, the bridge comprises the main beam and a plurality of handrail assemblies arranged on the main beam, each handrail assembly comprises a mounting plate, a rotary driving unit and a handrail unit, the mounting plate is rotationally matched with the main beam, and the rotary driving unit is in transmission connection with the mounting plate; the inclination angle and the inclination direction of the handrail assembly can be adjusted. A plurality of handrail units are arranged on the mounting plate, each handrail unit comprises two fixed stand columns and a plurality of transverse rods, the two fixed stand columns are oppositely arranged, the transverse rods are arranged on the fixed stand columns in an up-down moving mode, and the height of the handrail assembly can be changed. By arranging the rotatable handrail assembly and the liftable cross rod, the main beam has various achievable aerodynamic shapes, the aerodynamic shapes of the main beam can be flexibly changed, the stability requirements of the main beam for vortex vibration and flutter in different wind environments are met, and the stability of the main beam is improved. The problem that an existing bridge lacks reliable countermeasures when facing a complex wind environment is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridges, and in particular relates to a bridge capable of improving the vortex vibration and flutter stability of a main beam. Background Art

[0002] Vortex vibration and flutter are two types of vibration that may occur in bridges under the influence of wind. Among them, vortex vibration is a self-excited forced vibration that is very easy to occur at low wind speeds. Long-term vortex vibration will cause fatigue damage to the bridge and affect the life of the bridge. Flutter is a self-excited vibration with divergent properties that occurs at high wind speeds and is highly harmful to bridges. In bridge design, vortex vibration needs to be controlled and flutter must be avoided.

[0003] At present, the main method to improve the stability of vortex vibration and flutter of bridge main beams is to suppress them through aerodynamic measures, such as adding wind nozzles, guide plates, flow suppression plates, etc. to the main beams to change the aerodynamic shape of the bridge. However, the above measures are relatively simple, not flexible and intelligent, and have little effect on improving the stability of vortex vibration and flutter of bridges under complex meteorological conditions. Summary of the invention

[0004] The present invention provides a bridge with improved vortex vibration and flutter stability of a main beam, aiming to improve the vortex vibration and flutter stability of the main beam under complex meteorological conditions in a more flexible, intelligent and efficient manner.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a bridge for improving the vortex vibration and flutter stability of a main beam, comprising a main beam, and a plurality of railing assemblies arranged at intervals along the width direction of the main beam, wherein the railing assemblies are arranged on the upper surface of the main beam and extend along the length direction of the main beam, and an isolation channel is formed between adjacent railing assemblies; the railing assemblies include: A mounting plate is provided on the main beam and extends along the length direction of the main beam; a rotation drive unit, disposed on the main beam and drivingly connected to the mounting plate, the rotation drive unit being used to drive the mounting plate to rotate around an axis parallel to the length direction of the main beam; and At least one railing unit is arranged on the mounting plate. When there are multiple railing units, the multiple railing units are spaced apart along the length direction of the mounting plate. The railing unit includes two fixed columns and multiple cross bars. The two fixed columns are spaced apart along the length direction of the mounting plate. The fixed columns are provided with sliding grooves in the vertical direction. The cross bar is connected between the two fixed columns. The cross bar is slidably matched with the sliding groove. The multiple cross bars are spaced apart from top to bottom.

[0006] In a possible implementation, a first receiving groove is formed on the upper surface of the main beam. The first receiving groove extends along the length direction of the main beam, and the cross-section of the first receiving groove is semi-circular. The bottom of the mounting plate is a semi-cylindrical surface adapted to the first receiving groove. A semi-circular ring gear is provided at the bottom of the mounting plate, and the output shaft of the rotary drive unit meshes with the ring gear for transmission.

[0007] In a possible implementation, a drain hole is provided at the bottom of the first receiving groove. One end of the drain hole communicates with the first receiving groove, and the other end of the drain hole extends to the bottom or side of the main beam, enabling water to drain downward under the action of gravity. A rain sensor is provided in the drain hole, and a valve mechanism is provided at the outlet end of the drain hole. The valve mechanism is used to control the opening and closing of the drain hole.

[0008] In a possible implementation, the railing unit further includes a lifting drive mechanism, and the lifting drive mechanism includes: A plurality of lead screws are arranged in the chute at intervals along the length direction of the mounting plate. The lead screws are vertically arranged and correspond to the number of the cross bars. Each cross bar has a threaded hole and a plurality of guide holes. Among them, the threaded hole of the cross bar is in threaded cooperation with the corresponding lead screw, and the guide holes are respectively in sliding cooperation with the remaining lead screws; and A plurality of driving members are respectively arranged on the fixed columns. The driving members correspond to the lead screws one by one and are used to drive the corresponding lead screws to rotate around their own axes.

[0009] In a possible implementation, the cross bar includes: A partition part, which is in the shape of a long rod; and Two sliding parts are respectively arranged at both ends of the partition part. The sliding parts have the threaded hole and the guide holes.

[0010] In a possible implementation, a first adjustment groove is provided at the bottom of the partition part. An adjustment plate and a first telescopic rod are accommodated in the first adjustment groove. The adjustment plate is provided with a second adjustment groove opposite to the first adjustment groove. One end of the first telescopic rod is connected to the bottom of the first adjustment groove, and the other end is connected to the bottom of the second adjustment groove. The first telescopic rod is used to drive the adjustment plate to move, so that the adjustment plate can extend out of or be received into the adjustment groove.

[0011] In a possible implementation, a storage bin is formed on the upper surface of the mounting plate. The storage bin is located between the two fixed columns. The lower end of the lead screw extends into the storage bin. The cross bar has a storage state in which it is received in the storage bin and an isolation state in which it is moved out of the storage bin.

[0012] In a possible implementation, a protective cover is provided on the top of the storage bin, and the protective cover is slidably arranged in a horizontal direction.

[0013] In a possible implementation, a second accommodating groove is provided at the bottom of the main beam, the second accommodating groove extends along the length direction of the main beam, a second telescopic rod is provided in the second accommodating groove, the lower end of the second telescopic rod is connected to the maintenance vehicle track, the second telescopic rod is used to drive the maintenance vehicle track to extend from the second accommodating groove or be received in the second accommodating groove, when the maintenance vehicle track is received in the second accommodating groove, the bottom of the maintenance vehicle track can close the opening of the second accommodating groove.

[0014] In a possible implementation, the bridge for improving the vortex vibration and flutter stability of the main beam further includes a meteorological environment identification component, and the meteorological environment identification component includes an anemometer and a wind vane respectively arranged on the main beam.

[0015] Compared with the prior art, the beneficial effects of the bridge provided by the present invention for improving the vortex vibration and flutter stability of the main beam are: A bridge for improving the vortex vibration and flutter stability of a main beam provided by the present invention comprises a main beam and a plurality of railing assemblies arranged on the main beam, wherein the railing assembly comprises a mounting plate, a rotation drive unit and a railing unit, wherein the mounting plate is rotationally matched with the main beam, and the rotation drive unit is transmission-connected with the mounting plate, and the inclination angle and inclination direction of the railing assembly can be adjusted, so that the railing assembly not only has the blocking and separation functions of a conventional railing, but also has the function of changing the aerodynamic shape of the main beam. A plurality of railing units are arranged on the mounting plate, and the railing units comprise two fixed columns and a plurality of cross bars arranged opposite to each other, and the plurality of cross bars are arranged on the fixed columns movably up and down, so that the height of the railing assembly can be changed, and the aerodynamic shape of the main beam can also be changed.

[0016] The present invention provides a rotatable railing assembly and a liftable cross bar so that the main beam has a variety of achievable aerodynamic shapes, can flexibly change the aerodynamic shape of the main beam, meet the stability requirements of the main beam against vortex vibration and flutter in different wind environments, and solve the problem that existing bridges lack reliable response measures when facing complex wind environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Stereogram of a bridge provided in an embodiment of the present application for improving the vortex-induced vibration and flutter stability of the main girder; Figure 2 For Figure 1 Partial enlarged view of part A in Figure 3 Internal cross-sectional view of a bridge provided in an embodiment of the present application for improving the vortex-induced vibration and flutter stability of the main girder; Figure 4 Partial schematic view of the mounting plate and the railing unit in an embodiment of the present application; Figure 5 Structural schematic view of the cross bar in an embodiment of the present application; Figure 6 Internal cross-sectional view of the partition part in an embodiment of the present application; Figure 7 Structural schematic view of another implementable manner of the lifting drive mechanism in an embodiment of the present application; Figure 8 Graph of the relationship between the critical flutter wind speed of the main girder under different wind attack angles and bridge deck states measured through wind tunnel tests; Figure 9 Graph of the relationship between the critical flutter wind speed of the main girder under different wind attack angles and railing heights measured through wind tunnel tests; Figure 10 Graph of the relationship between the critical flutter wind speed of the main girder under different wind attack angles and railing inclination angles measured through wind tunnel tests; Figure 11 Schematic diagram of the positions of the -3°, 0°, and +3° wind attack angles relative to the main girder.

[0020] Explanation of reference numerals: 1. Main girder; 101. First accommodation groove; 102. Drainage hole; 103. Second accommodation groove; 104. Second telescopic rod; 2. Railing assembly; 3. Maintenance vehicle track; 10. Mounting plate; 11. Tooth ring; 12. Storage bin; 20. Railing unit; 21. Fixed column; 22. Cross bar; 221. Partition part; 222. Sliding part; 2221. Threaded hole; 2222. Guide hole; 223. Adjusting plate; 224. First telescopic rod; 23. Lifting drive mechanism; 231. Lead screw; 232. Driving member; 233. Rack; 234. Traveling gear. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0022] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0023] For ease of description, spatially relative relationship terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure relative to another element or feature. These relative relationship terms such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", "front", "rear", etc. The intention of these spatially relative relationship terms is to include different orientations of the device in use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure undergoes a position flip or attitude change or motion state change, then these directional indications will change accordingly. For example, an element described as "below" or "beneath" other elements or features will then be oriented as "above" or "over" other elements or features. Therefore, the exemplary term "below" can include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatially relative relationship descriptors used in the text are interpreted accordingly.

[0024] Please refer to Figures 1 to 11 , and a bridge for improving the vortex-induced vibration and flutter stability of the main girder provided by the embodiments of the present invention will be described below.

[0025] Please refer to Figure 1 and Figure 2, an embodiment of the present invention provides a bridge for improving the vortex-induced vibration and flutter stability of the main girder, mainly including a main girder 1 and a plurality of railing assemblies 2 arranged at intervals along the width direction of the main girder 1. The railing assemblies 2 are arranged on the upper surface of the main girder 1 and extend along the length direction of the main girder 1. An isolation passage is formed between adjacent railing assemblies 2. The isolation passage can be used for pedestrians, bicycles, and automobiles to pass through, or can be used to set green belts. The railing assembly 2 includes a mounting plate 10, a rotary driving unit, and a railing unit 20. The mounting plate 10 is arranged on the main girder 1 and extends along the length direction of the main girder 1; the rotary driving unit is arranged on the main girder 1 and is in transmission connection with the mounting plate 10, and the rotary driving unit is used to drive the mounting plate 10 to rotate around an axis parallel to the length direction of the main girder 1; at least one railing unit 20 is arranged on the mounting plate 10. When there are multiple railing units 20, the multiple railing units 20 are arranged at intervals along the length direction of the mounting plate 10. The railing unit 20 includes two fixed columns 21 and a plurality of cross bars 22. The two fixed columns 21 are arranged at intervals along the length direction of the mounting plate 10. The fixed columns 21 are provided with sliding grooves in the vertical direction. The cross bars 22 are connected between the two fixed columns 21. The cross bars 22 are slidably matched with the sliding grooves, and the plurality of cross bars 22 are arranged at intervals from top to bottom.

[0026] Compared with the prior art, the beneficial effect of a bridge for improving the vortex-induced vibration and flutter stability of the main girder provided by an embodiment of the present invention is: A bridge for improving the vortex-induced vibration and flutter stability of the main girder provided by an embodiment of the present invention includes a main girder 1 and a plurality of railing assemblies 2 arranged on the main girder 1. The railing assembly 2 includes a mounting plate 10, a rotary driving unit, and a railing unit 20. The mounting plate 10 is rotationally matched with the main girder 1, and the rotary driving unit is in transmission connection with the mounting plate 10, so that the inclination angle and inclination direction of the railing assembly 2 can be adjusted, enabling the railing assembly 2 to not only have the functions of blocking and separating of a conventional railing, but also have the function of changing the aerodynamic shape of the main girder 1. A plurality of railing units 20 are arranged on the mounting plate 10. The railing unit 20 includes two relatively arranged fixed columns 21 and a plurality of cross bars 22. The plurality of cross bars 22 are arranged on the fixed columns 21 so as to be movable up and down, which can change the height of the railing assembly 2 and can also change the aerodynamic shape of the main girder 1.

[0027] By providing a rotatable railing assembly 2 and a liftable cross bar 22 in an embodiment of the present invention, the main girder 1 has a variety of achievable aerodynamic shapes, can flexibly change the aerodynamic shape of the main girder 1, meet the stability requirements of the main girder 1 for vortex-induced vibration and flutter in different wind environments, and solve the problem that existing bridges lack reliable countermeasures in the face of complex wind environments.

[0028] In an embodiment of the present invention, the main girder 1 is an existing bridge structure, such as a streamlined box girder, a steel box girder, etc. No specific restrictions are imposed on parameters such as the length, width, and height-width ratio of the main girder 1, and users can set them according to actual situations.

[0029] A plurality of railing assemblies 2 are arranged in parallel on the main beam 1. The railing assembly 2 is composed of a mounting plate 10, a rotary drive unit, and a railing unit 20. The mounting plate 10 is arranged on the bridge deck of the main beam 1 and is rotationally matched with the main beam 1. Optionally, the mounting plate 10 can be embedded in the bridge deck or protrude from the bridge deck of the main beam 1. The cross-sectional shape of the mounting plate 10 can be square, circular, semi-circular, fan-shaped, triangular, etc. The rotary drive unit is used to drive the mounting plate 10 to rotate around a horizontal axis, and the horizontal axis is parallel to the length direction of the main beam 1. The rotary drive unit can be an existing rotary drive device such as a drive motor or a hydraulic drive motor, and one or more can be set according to needs, as long as the rotation adjustment requirements of the railing assembly 2 can be met. Power transmission between the rotary drive unit and the rotating shaft of the mounting plate 10 can be achieved through methods such as gear meshing transmission and chain transmission, and a speed reduction and torque increase transmission device such as a reducer can be set between the output shaft of the rotary drive unit and the rotating shaft of the mounting plate 10 according to needs.

[0030] The railing unit 20 includes fixed columns 21 and crossbars 22. There are two fixed columns 21 arranged opposite to each other, and an accommodating space for the crossbar 22 is formed between the two fixed columns 21. The two ends of the crossbar 22 are respectively accommodated in the sliding grooves of the two fixed columns 21, and the crossbar 22 can move up and down, thereby changing the aerodynamic shape of the main beam 1. Optionally, the movement of the crossbar 22 along the sliding groove can be driven by a hydraulic rod or adjusted manually. The fixed columns 21 and the crossbars 22 can be made of steel or other materials.

[0031] The railing assembly 2 can be divided into a sidewalk railing, a collision prevention railing system, a central isolation railing, etc. according to its functions.

[0032] It should be noted that in order to clarify which aerodynamic shape of the main beam 1 has better vortex-induced vibration and flutter stability in different wind environments, a bridge model needs to be made, and then a simulation test is carried out on the bridge model through a wind tunnel test. According to the test results, corresponding adjustment strategies are formulated, and the adjustment strategies are applied to the actually constructed bridge to provide data support for the aerodynamic shape adjustment of the bridge.

[0033] Please refer to Figures 1 to 4 , in some possible embodiments, a first accommodating groove 101 is opened on the upper surface of the main beam 1. The first accommodating groove 101 extends along the length direction of the main beam 1. The cross-section of the first accommodating groove 101 is semi-circular. The bottom of the mounting plate 10 is a semi-cylindrical surface adapted to the first accommodating groove 101. A semi-circular ring gear 11 is provided at the bottom of the mounting plate 10, and the output shaft of the rotary drive unit meshes with the ring gear 11 for transmission.

[0034] By controlling the rotation direction (clockwise or counterclockwise rotation) of the rotation drive unit, the tilting orientation of the railing assembly 2 can be changed so that the tilting direction of the railing assembly 2 faces the inner or outer side of the bridge. By controlling the output angle of the rotation drive unit, the tilting angle of the railing assembly 2 can be changed, such as tilting 20°, 30°, 80°, 90°, etc.

[0035] Please refer to Figure 3 , in some possible embodiments, a drain hole 102 is provided at the bottom of the first receiving groove 101. One end of the drain hole 102 communicates with the first receiving groove 101, and the other end of the drain hole 102 extends to the bottom or side of the main beam 1, so that water can be discharged downward under the action of gravity. The drain hole 102 can be directly formed on the main beam 1 or formed by arranging a drain pipe, as long as the accumulation of water in the first receiving groove 101 can be prevented.

[0036] In order to prevent birds from building nests in the drain hole 102, a valve mechanism is provided at the outlet end of the drain hole 102. The valve mechanism is used to control the opening and closing of the drain hole 102. Specifically, the valve mechanism can be an existing electric control ball valve, solenoid valve or other valve products that can be used to control the opening and closing of pipelines. A rain sensor is provided in the drain hole 102. When the rain sensor detects that there is water in the drain hole 102, it controls the valve mechanism to open for drainage. After the drainage is completed, the valve mechanism is closed in time to prevent birds from drilling into the drain hole 102.

[0037] Please refer to Figure 2 and Figure 4 , in some possible embodiments, the railing unit 20 further includes a lifting drive mechanism 23. The lifting drive mechanism 23 includes a lead screw 231 and a drive member 232. A plurality of lead screws 231 are arranged in the chute at intervals along the length direction of the mounting plate 10. The lead screws 231 are vertically arranged, and the number of lead screws 231 corresponds to the number of cross bars 22. Each cross bar 22 has a threaded hole 2221 and a plurality of guide holes 2222; wherein, the threaded hole 2221 of the cross bar 22 is in threaded cooperation with the corresponding lead screw 231, and the guide holes 2222 are respectively in sliding cooperation with the remaining lead screws 231; a plurality of drive members 232 are respectively arranged on the fixed column 21, and the drive members 232 correspond to the lead screws 231 one by one and are used to drive the corresponding lead screws 231 to rotate around their own axes.

[0038] In this embodiment, the lifting drive mechanism 23 is used to drive the cross bar 22 to move vertically. The lifting drive mechanism 23 includes a plurality of lead screws 231 arranged side by side. Each lead screw 231 is controlled to rotate by an independent drive member 232. The plurality of lead screws 231 can rotate independently without affecting each other. The number of lead screws 231 corresponds to the number of cross bars 22. The cross bar 22 has a plurality of guide holes 2222 and a threaded hole 2221. The threaded hole 2221 is in threaded cooperation with one of the lead screws 231, and the guide holes 2222 are in sliding cooperation with the remaining plurality of lead screws 231 one by one. With such a setting, the cross bar 22 can be lifted and lowered by controlling a specific lead screw 231. At the same time, during the lifting and lowering process of the cross bar 22, the remaining lead screws 231 play a guiding role.

[0039] The lifting drive mechanism 23 provided in this embodiment is arranged in the fixed column 21, with a compact structure. The drive member 232 can adopt a common motor, which is convenient to set. The end of the cross bar 22 is provided with a guide hole 2222 and a threaded hole 2221, and there are no other special requirements for the specific shape and structure of the cross bar 22, which is convenient for production and manufacturing.

[0040] In addition to the above implementation methods, as Figure 7 shown, the lifting drive mechanism 23 includes a rack vertically arranged on the fixed column 21. The end of the cross bar 22 is provided with a traveling gear and a motor. The traveling gear is in meshing transmission with the rack, and the motor drives the traveling dimension to rotate, so that the cross bar 22 can move up and down along the rack.

[0041] Please refer to Figure 5 , in some possible embodiments, the cross bar 22 includes a partition portion 221 and two sliding portions 222. The partition portion 221 is in the shape of a long rod; the two sliding portions 222 are respectively arranged at both ends of the partition portion 221. The sliding portion 222 has a threaded hole 2221 and a guide hole 2222. The threaded hole 2221 is used for threaded cooperation with one of the lead screws 231, and the guide hole 2222 is used for sliding cooperation with the remaining lead screws 231.

[0042] Considering that during the process of the railing assembly 2 changing its own inclination angle or the height of the cross bar 22, the ventilation rate of the railing assembly 2 will change, and the change in the ventilation rate has a risk of deteriorating the wind resistance effect of the bridge. Therefore, please refer to Figure 5 and Figure 6, in some possible embodiments, a first adjustment groove is provided at the bottom of the partition portion 221. An adjustment plate 223 and a first telescopic rod 224 are accommodated in the first adjustment groove. The adjustment plate 223 is provided with a second adjustment groove opposite to the first adjustment groove. One end of the first telescopic rod 224 is connected to the bottom of the first adjustment groove, and the other end is connected to the bottom of the second adjustment groove. The first telescopic rod 224 is used to drive the adjustment plate 223 to move, so that the adjustment plate 223 extends out of or is received into the adjustment groove. The first telescopic rod 224 can be an electric telescopic rod, a pneumatic push rod, etc. In order to make the overall structure more compact, a first adjustment groove is opened at the bottom of the partition portion 221, and a second adjustment groove is opened at the top of the adjustment plate 223. The first telescopic rod 224 is accommodated in the first adjustment groove and the second adjustment groove.

[0043] In this embodiment, a first adjustment groove is opened below the partition portion 221 of the cross bar 22. The adjustment plate 223 is slidably disposed in the first adjustment groove. When the ventilation rate of the railing assembly 2 changes, the original ventilation rate can be maintained by the telescopic movement of the adjustment plate 223 to eliminate potential risks. According to needs, a telescopic plate can also be provided below the adjustment plate 223 to form a multi-stage telescopic structure. The setting method and driving method of the telescopic plate are the same as those of the adjustment plate 223, and an electric telescopic rod can also be used to drive the telescopic movement, which will not be elaborated here.

[0044] Please refer to Figure 4 , in some possible embodiments, a storage bin 12 is opened on the upper surface of the mounting plate 10. The storage bin 12 is located between the two fixed columns 21. The lower end of the lead screw 231 extends into the storage bin 12. The cross bar 22 has a storage state accommodated in the storage bin 12 and an isolation state moved out of the storage bin 12. After the cross bar 22 is completely received into the storage bin 12, the main beam 1 forms a bare beam, which can further optimize the aerodynamic shape of the main beam 1.

[0045] In some possible embodiments, a protective cover plate is provided at the top of the storage bin 12. The protective cover plate is slidably disposed in the horizontal direction. During normal use, the protective cover plate covers the top of the storage bin 12 to prevent objects such as water and garbage from entering.

[0046] Optionally, the protective cover plate can be made of a metal plate, and the protective cover plate can be driven by a hydraulic cylinder to be opened or closed.

[0047] Please refer to Figure 3, in some possible embodiments, a second receiving groove 103 is formed at the bottom of the main beam 1. The second receiving groove 103 extends along the length direction of the main beam 1. A second telescopic rod 104 is provided in the second receiving groove 103. The lower end of the second telescopic rod 104 is connected to the maintenance vehicle track 3. The second telescopic rod 104 is used to drive the maintenance vehicle track 3 to extend out of the second receiving groove 103 or be received into the second receiving groove 103. When the maintenance vehicle track 3 is received into the second receiving groove 103, the bottom of the maintenance vehicle track 3 can close the opening of the second receiving groove 103, further optimizing the aerodynamic shape of the main beam 1.

[0048] In some possible embodiments, the bridge for improving the vortex-induced vibration and flutter stability of the main beam further includes a meteorological environment recognition component. The meteorological environment recognition component includes an anemometer and a wind vane respectively provided on the main beam 1, which are used to monitor the wind environment where the bridge is located in real time and transmit the data to the control center, so that the control center can adopt appropriate control strategies according to the current wind environment. Both the wind vane and the anemometer can select existing products on the market, and there is no restriction on their specific specifications and models.

[0049] Combined with the content of the above embodiments, the working principle will be specifically described below: The present invention provides a bridge for improving the vortex-induced vibration and flutter stability of the main beam. By using the meteorological environment recognition component to monitor the meteorological conditions in real time and using driving components such as hydraulic cylinders, drive motors, and electric telescopic rods to adjust the forms of components such as the railing component 2 and the maintenance vehicle track 3, the aerodynamic shape of the main beam 1 is optimized. The main beam 1 has a variety of different aerodynamic shapes, so as to flexibly, intelligently, and efficiently respond to the occurrence of vortex-induced vibration of the main beam 1 under complex meteorological conditions, and at the same time avoid the generation of flutter, improving the stability of the bridge.

[0050] In actual application, the control strategies for the aerodynamic shape of the bridge corresponding to different wind environments have been input into the control center. The control center can be a single controller or a control site responsible by specialized staff. That is, the adjustment of the aerodynamic shape of the bridge can be automatically realized through the set controller, or can be manually controlled on site by means of remote control, etc.

[0051] The meteorological environment intelligent recognition component is used to monitor the current angle of attack and wind speed. The control center can receive the data of the meteorological environment recognition component and select a solution that matches the current wind environment from the solution library. After the control center designates the corresponding control strategy, it can remotely control the relevant equipment to act through wireless network signals and PLC control programs, adjust the tilt angle, ventilation rate, and height of the cross bar 22 of the railing component 2 to optimize the aerodynamic shape of the main beam 1, so as to suppress the vortex-induced vibration amplitude and improve the flutter stability.

[0052] Such as Figure 1 and Figure 3As shown in the figure, taking a streamlined box girder with an aspect ratio of 10:1 as an example, when the bridge is in normal operation, it is in the completed bridge state, and vehicles and pedestrians can pass normally. The railing assembly 2 and the maintenance vehicle track 3 are installed on the bridge deck. In the completed bridge state, the railing assembly 2 is vertical, and the maintenance vehicle track 3 is in an exposed state. The normal height of the sidewalk railing can specifically be 0.34 times the height of the beam (the height of the main beam 1 is defined as H, and the height of the railing assembly 2 is 0.34H), and the ventilation rate is 81.50%. In different control strategies, the height and ventilation rate of the cross bar 22 can be increased or decreased as needed. For example, the maximum height of the cross bar 22 can be 0.54H. The height and ventilation rate of the anti-collision railing between the motor vehicle lane and the sidewalk and the central isolation railing between the two-way motor vehicle lanes can be the same as or different from those of the sidewalk railing.

[0053] Since the railing assemblies 2 at the outermost edges on both sides of the main beam 1 are sidewalk railings, which are close to the edge of the main beam 1 and are also the positions that need to be most concerned about. The aerodynamic shape adjustment measures specifically involve changing the height of the sidewalk railing, the inclination angle of the sidewalk railing, the ventilation rate of the sidewalk railing, and the bridge deck state. Of course, according to needs, the height and inclination angle of the anti-collision railing and the central isolation railing located inside the bridge can also be changed simultaneously.

[0054] The bridge deck state of the main beam 1 includes the completed bridge state during normal operation and the bare beam state during out-of-service. In the completed bridge state, the cross bar 22 and the maintenance vehicle track 3 are exposed to the outside and can operate normally. In the bare beam state, there are no cross bar 22 and maintenance vehicle track 3 on the bridge deck. At this time, the entire bridge needs to be closed and passage is prohibited. The railing assembly 2 can be inclined towards the inside of the bridge, simply referred to as inward inclination, or can be inclined towards the outside of the bridge, simply referred to as outward inclination.

[0055] The wind speed and wind attack angle of the wind environment where the bridge is located are measured by the meteorological environment recognition component. The anemometer is responsible for real-time detection of the incoming flow wind speed, and the wind vane is responsible for real-time detection of the angle of the incoming flow wind relative to the main beam 1. The collected wind speed and wind attack angle data will be transmitted to the terminal controller in real time, and the controller will perform dimensionless processing on the wind speed and judge the wind speed level. Dimensionless processing is an operation in the prior art, and its specific processing method will not be elaborated here.

[0056] The relationship between the wind speed and the vibration interval is defined as follows: when the dimensionless wind speed is less than or equal to 2.5 m / s, it is the vortex-induced vibration interval, denoted as A-level wind speed; when the dimensionless wind speed is greater than 2.5 m / s but less than or equal to 3.5 m / s, it is the flutter inspection interval, denoted as B-level wind speed; when the dimensionless wind speed is greater than 3.5 m / s but less than or equal to 4.8 m / s, it is the flutter critical interval, denoted as C-level wind speed; when the dimensionless wind speed is greater than 4.8 m / s, it is the flutter interval, denoted as D-level wind speed.

[0057] The controller classifies the wind attack angle. For example, it defines that a wind attack angle of -3° is class A attack angle, a wind attack angle of 0° is class B attack angle, and a wind attack angle of +3° is class C attack angle. The schematic diagram of the wind attack angle is as shown in Figure 11 shown, Figure 11 where the rectangle at the origin of the coordinates in Figure 11 represents the cross-section of the main girder 1.

[0058] The controller compares the data of the wind speed and the wind attack angle with the solution library that records the control strategies, selects the matching aerodynamic shape solution in the solution library, and then sends the adjustment instructions related to this aerodynamic shape to the corresponding drive device to adjust the aerodynamic shape of the bridge. Of course, there are other ways to control the wind-induced vibration of the bridge, such as installing a TMD (tuned mass damper). The technical solution provided by the present invention is used to change the aerodynamic shape of the bridge, and in practical applications, it does not conflict with the installation of dampers and can be applied simultaneously.

[0059] In the solution library, the stored data and their corresponding aerodynamic measures and solutions are shown in Table 1.

[0060] Table 1 Solution library recording different control strategies

[0061] In the above solution, the control strategies at wind attack angles of 0°, -3° and +3° are entered. In practical applications, the corresponding control strategies at other wind attack angles can also be entered, and there is no restriction on this.

[0062] When the instruction issued by the controller is "adjust to the completed bridge state": The mounting plate 10 of the railing assembly 2 starts to rotate under the drive of the rotary drive unit and the gear ring, so that the railing assembly 2 is in a vertical state. The height of the highest crossbar 22 is 0.34H, and the ventilation rate is adjusted to 81.50% by extending or contracting the adjustment plate. The maintenance vehicle track 3 extends downward from the bottom of the main girder 1.

[0063] When the instruction issued by the controller is "adjust to the bare beam state": The storage bin opens, the crossbar 22 moves downward into the storage bin, and then the protective cover plate closes, and the fixed column 21 remains unchanged; the maintenance vehicle track 3 moves into the second accommodation groove under the drive of the second telescopic rod 104.

[0064] When the instruction issued by the controller is "reduce the height of the sidewalk railing to 0.24H": The outermost railing assembly 2, that is, the sidewalk railing, is in a vertical state. The height of the highest crossbar 22 is adjusted to 0.24H (H is the height of the main girder 1), and the ventilation rate is adjusted to 81.50% by the expansion and contraction of the adjustment plate. The maintenance vehicle track 3 extends from the bottom of the main girder 1 under the drive of the second telescopic rod 104.

[0065] When the instruction issued by the controller is "the height of the sidewalk railing is reduced to 0.44H": Similarly, the sidewalk railing is adjusted to the vertical state, the maximum height of the crossbar 22 is 0.44H, the ventilation rate is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0066] When the instruction issued by the controller is "the height of the sidewalk railing is reduced to 0.54H": Similarly, the sidewalk railing is adjusted to the vertical state, the maximum height of the crossbar 22 is 0.54H, the ventilation rate is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0067] When the instruction is "the sidewalk railing inclines inwards by 20°": The outermost sidewalk railing is adjusted to incline 20° towards the inside of the bridge, the maximum height of the crossbar 22 is 0.34H, the ventilation rate is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0068] When the instruction is "the sidewalk railing inclines outwards by 20°": Similarly, the inclination angle of the sidewalk railing is adjusted to incline 20° towards the outside of the bridge, the maximum height of the crossbar 22 is 0.34H, the ventilation rate is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0069] When the instruction is "activate the TMD tuned mass damper": The system activates the pre-installed TMD tuned mass damper on the bridge.

[0070] It should be noted that the above is only an example of the bridge control strategy and does not limit the actual application. In actual application, users can set the relevant parameters and actions of the control strategy according to the situation.

[0071] The reliability of the above scheme is verified through wind tunnel tests. Three groups of wind attack angles of -3°, 0°, and +3° are set respectively. Under each group of wind attack angles, the bare beam state and the completed bridge state are set. Among them, the completed bridge state working conditions include the railing assembly 2 in different crossbar 22 heights (0.24H, 0.34H, 0.44H, 0.54H) and different inclination angles (vertical state, incline inwards by 20°, and incline outwards by 20°). Taking the railing assembly 2 with the crossbar 22 height of 0.34H and in the vertical state as the reference working condition, the vortex-induced vibration and flutter tests of the main beam 1 are carried out, and finally the vortex-induced vibration occurrence situation and flutter critical wind speed of the main beam 1 under different working conditions are obtained.

[0072] Table 2 Wind-induced vibration situation table of the main beam 1 obtained from wind tunnel tests

[0073] The specific situation of the test results is shown in Table 2 above, and Figure 8 、 Figure 9 and Figure 10 。From Table 2 and Figure 8 、Figure 9 and Figure 10 It can be seen that in different wind attack angle conditions, at Class A wind speed, due to the low wind speed, the system will preferentially select aerodynamic measures that prevent the bridge from experiencing vortex-induced vibration and ensure the normal operation of the bridge; at Class B wind speed, since the flutter inspection wind speed is not reached, the system will uniformly select to adjust to the completed bridge state and increase the acquisition frequency to closely monitor the wind environment; at Class C wind speed, since the wind speed exceeds the flutter inspection wind speed but has not approached the flutter critical wind speed, the system will activate the flutter warning and preferentially adopt the aerodynamic measure with the highest flutter critical wind speed; at Class D wind speed, since the wind speed approaches the flutter critical wind speed and flutter may occur, while activating the flutter warning and adopting the aerodynamic measure with the highest flutter critical wind speed, a TMD (tuned mass damper) is enabled to suppress vibration.

[0074] Through the above control strategy scheme, the bridge can adjust the aerodynamic shape of the main girder 1 in real time, automatically, and in a flexible and diverse manner according to the wind environment, improving the wind resistance stability of the main girder 1 against vortex-induced vibration and flutter in complex wind environments.

[0075] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] The above is the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A bridge that improves the vortex-induced vibration and flutter stability of the main girder, characterized in that It includes a main beam (1) and a plurality of railing assemblies (2) arranged at intervals along the width direction of the main beam (1). The railing assemblies (2) are provided on the upper surface of the main beam (1) and extend along the length direction of the main beam (1); the railing assemblies (2) include: A mounting plate (10) provided on the main beam (1) and extending along the length direction of the main beam (1); A rotary drive unit provided on the main beam (1) and drivingly connected to the mounting plate (10). The rotary drive unit is used to drive the mounting plate (10) to rotate about an axis parallel to the length direction of the main beam (1); and A plurality of railing units (20) arranged at intervals along the length direction of the mounting plate (10). The railing unit (20) includes two fixed columns (21) and a plurality of cross bars (22). The two fixed columns (21) are arranged at intervals along the length direction of the mounting plate (10). The fixed columns (21) have vertical sliding grooves. The cross bars (22) are connected between the two fixed columns (21). The cross bars (22) are slidably engaged with the sliding grooves. The plurality of cross bars (22) are arranged at intervals from top to bottom.

2. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 1, characterized in that, A first accommodation groove (101) is formed on the upper surface of the main beam (1). The first accommodation groove (101) extends along the length direction of the main beam (1). The cross section of the first accommodation groove (101) is semi-circular. The bottom of the mounting plate (10) is a semi-cylindrical surface adapted to the first accommodation groove (101). A semi-circular ring gear (11) is provided at the bottom of the mounting plate (10). The output shaft of the rotary drive unit is meshed and driven with the ring gear (11).

3. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 2, characterized in that, A drain hole (102) is provided at the bottom of the first accommodation groove (101). One end of the drain hole (102) is communicated with the first accommodation groove (101). The other end of the drain hole (102) extends to the bottom or side of the main beam (1). A rain sensor is provided in the drain hole (102). A valve mechanism is provided at the outlet end of the drain hole (102). The valve mechanism is used to control the opening and closing of the drain hole (102).

4. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 1, characterized in that, The railing unit (20) further includes a lifting drive mechanism (23). The lifting drive mechanism (23) includes: A plurality of lead screws (231) arranged at intervals along the length direction of the mounting plate (10) in the sliding groove. The lead screws (231) are vertically arranged. The number of the lead screws (231) corresponds to that of the cross bars (22). Each cross bar (22) has a threaded hole (2221) and a plurality of guide holes (2222); wherein, the threaded hole (2221) of the cross bar (22) is in threaded cooperation with one of the lead screws (231), and the guide holes (2222) are in sliding cooperation with the remaining lead screws (231) one by one; and A plurality of driving members (232) are respectively arranged on the fixed vertical columns (21), and the driving members (232) correspond to the lead screws (231) one by one, and are used to drive the corresponding lead screws (231) to rotate around their own axes.

5. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 4, characterized in that, The cross bar (22) includes: A partition portion (221), which is in the shape of a long rod; and Two sliding portions (222) are respectively arranged at both ends of the partition portion (221), and the sliding portions (222) are provided with the threaded holes (2221) and the guiding holes (2222).

6. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 5, characterized in that, A first adjustment groove is provided at the bottom of the partition portion (221), and an adjustment plate (223) and a first telescopic rod (224) are accommodated in the first adjustment groove. The adjustment plate (223) is provided with a second adjustment groove opposite to the first adjustment groove. One end of the first telescopic rod (224) is connected to the bottom of the first adjustment groove, and the other end is connected to the bottom of the second adjustment groove. The first telescopic rod (224) is used to drive the adjustment plate (223) to move, so that the adjustment plate (223) extends out of or is received into the adjustment groove.

7. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 4, characterized in that, A storage bin (12) is provided on the upper surface of the mounting plate (10), and the storage bin (12) is located between the two fixed vertical columns (21). The lower end of the lead screw (231) extends into the storage bin (12). The cross bar (22) has a storage state where it is accommodated in the storage bin (12) and an isolation state where it is moved out of the storage bin (12).

8. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 7, characterized in that, A protective cover plate is provided at the top of the storage bin (12), and the protective cover plate is slidably arranged in the horizontal direction.

9. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 1, characterized in that, A second accommodation groove (103) is provided at the bottom of the main beam (1), and the second accommodation groove (103) extends along the length direction of the main beam (1). A second telescopic rod (104) is arranged in the second accommodation groove (103), and the lower end of the second telescopic rod (104) is connected with a maintenance vehicle track (3). The second telescopic rod (104) is used to drive the maintenance vehicle track (3) to extend out of or be received into the second accommodation groove (103). When the maintenance vehicle track (3) is received into the second accommodation groove (103), the bottom of the maintenance vehicle track (3) can close the opening of the second accommodation groove (103).

10. A bridge for improving the vortex-induced vibration and flutter stability of the main girder according to claim 1, characterized in that, The bridge for improving the vortex-induced vibration and flutter stability of the main beam further includes a meteorological environment recognition component, and the meteorological environment recognition component includes an anemometer and a wind vane respectively arranged on the main beam (1).

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