A wind barrier for a double-deck truss bridge

Abstract

The present invention discloses a wind barrier for a double-deck truss bridge, belonging to the technical field of wind barriers. It includes a number of spliced wind barrier units. The wind barrier unit includes wind barrier columns, a number of wind barrier strips, a sliding plate, a first rack assembly, a second rack assembly, a number of first columnar gear assemblies, a second columnar gear assembly, a wind power driving element and a traction element. The wind barrier columns are arranged at both ends of the wind barrier unit, and one end of the wind barrier column is connected to the bridge deck. The two side surfaces in the width direction of the sliding plate are slidably arranged on the inner walls of the wind barrier columns. The first rack assembly and the second rack assembly are oppositely arranged on the two side surfaces in the length direction of the wind barrier columns. A number of the first columnar gear assemblies and the second columnar gear assemblies are respectively arranged outside the first rack assembly and the second rack assembly. When the wind barrier in this technical solution is under strong wind, it can automatically change the ventilation rate of the wind barrier strips to ensure the safety performance of the bridge.

Description

Technical Field

[0001] The invention belongs to the technical field of wind barriers, and particularly relates to a wind barrier for a double-layer truss bridge. Background Art

[0002] Out of consideration for driving safety, the "Code for Wind Resistance Design of Highway Bridges" has put forward restrictions on the driving wind speed of the bridge deck. For bridge sites with relatively harsh crosswind environments, in order to ensure the driving safety of vehicles under the influence of crosswinds, a common method is to set wind barriers on both sides or one side of the bridge. However, when setting wind barriers, under the action of wind force, the lateral horizontal thrust of the bridge main body is also increased. Especially for double-layer truss bridges with high girders and high piers, in strong wind weather, problems such as bridge slippage or toppling are likely to occur; therefore, it is necessary to allocate and adjust the wind resistance performance of the bridge deck and the crosswind resistance performance of vehicles on the bridge deck. In the prior art, there are already some wind barrier structures that can be opened in strong wind weather, and most of them are realized by electric drive mechanical devices, but the power supply on the bridge cannot be guaranteed, so the reliability of the wind barrier opening cannot be guaranteed. Summary of the Invention

[0003] In view of this, the purpose of the invention is to provide a wind barrier for a double-layer truss bridge, which can automatically change the air permeability of the wind barrier strips under the action of strong wind to ensure the safety performance of the bridge.

[0004] To achieve the above purpose, the invention provides the following technical solutions:

[0005] A wind barrier for a double-layer truss bridge of the invention is arranged on both sides and / or the central isolation belt of the bridge, and comprises a plurality of spliced wind barrier units. Each wind barrier unit includes a wind barrier column, a plurality of wind barrier strips, a sliding plate, a first rack assembly, a second rack assembly, a plurality of first cylindrical gear assemblies, a second cylindrical gear assembly, a wind power driving element and a traction element;

[0006] The wind barrier columns are arranged at both ends of the wind barrier unit, and one end of each wind barrier column is connected to the bridge deck. The two side surfaces in the width direction of the sliding plate are slidably arranged on the inner walls of the wind barrier columns. The first rack assembly and the second rack assembly are oppositely arranged on the two side surfaces in the length direction of the wind barrier column. A plurality of the first cylindrical gear assemblies and the second cylindrical gear assemblies are respectively arranged outside the first rack assembly and the second rack assembly, and both ends of the plurality of the first cylindrical gear assemblies and the second cylindrical gear assemblies are rotatably connected to the side surfaces of the wind barrier column. A plurality of the wind barrier strips are evenly arranged between the wind barrier columns, and the ends of the plurality of the wind barrier strips are respectively connected to the ends of the corresponding first cylindrical gear assemblies. The wind power driving element is connected to one end of the second cylindrical gear assembly. The traction element is arranged at the lower end of the sliding plate to control the traction torque and the sliding distance required for the sliding plate to slide.

[0007] The working principle of this technical solution is as follows:

[0008] Under the action of the wind-driven element, the second column gear assembly is driven to rotate. Then, the rotating second column gear assembly will mesh with the second rack assembly, thereby driving the sliding plate to move. The movement of the sliding plate will drive the first rack assembly to move, that is, in the meshing state, it will drive the first column gear assembly to rotate, thereby driving the wind barrier strip to rotate. Furthermore, when the external wind force is large, the wind barrier strip can be rotated to adjust the ventilation rate, and further reduce the acting force and influence of the wind on the bridge deck.

[0009] Furthermore, the shape of the wind barrier column is U-shaped, and sliding grooves are provided on both side surfaces of the wind barrier column. A number of roller mechanisms are provided in the sliding grooves, and both side surfaces in the width direction of the sliding plate are connected to the roller mechanisms. This sliding setting method not only has good sliding effect, but also can limit the position of the sliding plate to ensure the meshing effect of the gear and rack.

[0010] Furthermore, a baffle is provided at the lower end of the sliding groove. The sliding plate is arranged above the baffle, and the traction element is arranged below the baffle. A through hole is provided on the baffle. The traction element includes a counterweight and a traction rope. One end of the traction rope is connected to the counterweight, and the other end of the traction rope passes through the through hole and is fixed to the lower end surface of the sliding plate. Its advantage is that when the wind force acts on the wind-driven element, if the wind force level is sufficient and the force acting on the rotating blade by the wind is greater than the weight of the counterweight, the sliding plate will move upward, thereby realizing the rotation of the wind barrier strip. It should be noted that when the counterweight is blocked by the baffle, at this time the wind barrier strip rotates 90°, presenting the maximum ventilation rate. The setting of the counterweight here can be matched with the wind force level, and thus the wind force level when the wind barrier strip rotates can be set.

[0011] Furthermore, the wind-driven element includes a first rotating shaft and a number of rotating blades. Both ends of the first rotating shaft are rotatably connected to the wind barrier column and are connected to the end of the second column gear assembly. The rotating blades are evenly fixed on the first rotating shaft. Its advantage is that the setting method of the rotating blades and the first rotating shaft is simple and easy to implement in this solution. It should be noted that the blade setting method of the rotating blades can control the rotation direction of the rotating blades, and thus control the moving direction of the sliding plate. In this specific embodiment, the sliding plate can only slide in one direction, that is, when the rotating blade is affected by the wind on one side, it can only rotate in one direction. Therefore, this wind barrier is optimally arranged on one side of the bridge with a single-sided windward surface; of course, if you want to use it on both sides, only simple design changes are needed in this technical solution.

[0012] Furthermore, a warning mechanism is provided on the outer side of the windbreak column near the bridgehead. The warning mechanism includes a warning panel, a wire winding wheel, a pulling rope, a mounting column, a rotating block, and a spring. The wire winding wheel is fixed to the end of the first rotating shaft. One end of the mounting column is fixed to the windbreak column. The rotating block is rotatably connected to the other end of the mounting column. The warning panel is fixedly connected to the rotating block. One end of the spring is fixed to the mounting column, and the other end is fixed to the rotating block. One end of the pulling rope is fixed to the wire winding wheel, and the other end of the pulling rope is fixed to the rotating block.

[0013] When the first rotating shaft rotates to drive the sliding plate to slide to the limit position, causing the windbreak strip to flip to the maximum ventilation rate, the length of the pulling rope wound around the wire winding wheel just makes the warning panel rotate 90°. Therefore, when the wind force level is too high, the warning panel will rotate towards the oncoming vehicle direction, warning the driver and avoiding accidents when the vehicle crosses the bridge. When the wind force decreases, under the action of the counterweight, the sliding plate will reset, that is, the first rotating shaft will rotate in the reverse direction, releasing the wound pulling rope. Under the action of the spring, the warning panel will rotate back to its original position.

[0014] Furthermore, a U-shaped wire clip is provided on the windbreak column. The pulling rope passes through the U-shaped wire clip and is fixed to the wire winding wheel, guiding the pulling rope and facilitating its winding around the wire winding wheel.

[0015] In one embodiment, the first rack assembly includes an upper rack assembly and a lower rack assembly. The first cylindrical gear assembly includes an upper gear assembly and a lower gear assembly. The upper gear assembly is meshed with the upper rack assembly. There is a sliding distance between the lower rack assembly and the lower gear assembly. When the upper rack assembly drives the upper gear assembly to rotate 45°, the lower rack assembly comes into meshing contact with the lower gear assembly. When the upper rack assembly drives the upper gear assembly to rotate 90°, the lower rack assembly drives the lower gear assembly to rotate 90°. The traction element includes a first counterweight and a second counterweight that match the wind force level.

[0016] By setting the first counterweight and the second counterweight, two wind force levels can be corresponded to. When the wind force level matches the first counterweight, the upper rack assembly drives the upper gear assembly to rotate, and then the upper wind barrier strip can be flipped and opened, thereby adjusting the air permeability of the upper part. When the wind force level continues to increase, it will drive the second counterweight to move upward. At this time, the lower rack assembly will move, and then drive the lower gear assembly to rotate, and then realize the rotational opening of the lower wind barrier strip. Therefore, the setting of this technical solution can realize the corresponding opening of the upper and lower wind barrier strips according to the wind force level. It can be understood that when the wind force level is relatively large, the opening of the upper wind barrier strip can reduce the action of the wind force on the bridge. At the same time, due to the existence of the lower wind barrier strip, although the vehicle will be affected by a certain lateral wind, the vehicle can still drive on the bridge, which is equivalent to taking a compromise state between the forces on the bridge and the vehicle.

[0017] Further, a torsion spring is provided on the end of the wind barrier strip connected to the lower gear assembly. The beneficial effect is that since the lower gear group and the lower rack group do not contact at the beginning, they do not have the ability to interlock. Therefore, setting the torsion spring can control the magnitude of the initial rotation force, and then make the lower wind barrier strip rotate after the lower gear group and the lower rack group come into contact.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) This technical solution can drive the wind barrier strip to open under the action of wind force, that is, when the wind force is relatively large, the air permeability can be adjusted to ensure the safety of the bridge; (2) The setting of the warning mechanism can play a role in warning the driver when the air permeability of the wind barrier strip is the largest, avoiding danger when the driver gets on the bridge; (3) The setting of the upper gear group, the upper rack group, the lower gear group and the lower rack group enables the wind barrier strip to be partially opened according to the wind force level, that is, while ensuring the safety of the bridge, it also plays a certain protective effect on driving safety.

[0020] Other advantages, objectives and features of the present invention will be described in the subsequent specification, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0022] Figure 1 It is a schematic diagram of the double-layer truss bridge of the present invention;

[0023] Figure 2 It is a three-dimensional schematic diagram of the wind barrier of the present invention;

[0024] Figure 3 is a three-dimensional schematic diagram of the windbreak unit of the present invention;

[0025] Figure 4 is a three-dimensional schematic diagram of the skateboard setting of the present invention;

[0026] Figure 5 is a three-dimensional schematic diagram of another perspective of the skateboard setting of the present invention;

[0027] Figure 6 is a schematic diagram of the upper rack assembly and the lower rack assembly of the present invention;

[0028] Figure 7 is a schematic diagram of the warning mechanism of the present invention.

[0029] The markings in the drawings are as follows:

[0030] Double-layer truss bridge 1, guardrail 2, bridge deck 3, windbreak column 4, skateboard 5, first rack assembly 6, upper rack assembly 61, lower rack assembly 62, first columnar gear assembly 7, upper gear assembly 71, lower gear assembly 72, second rotating shaft 8, windbreak strip 9, first rotating shaft 10, rotating blade 11, second columnar gear assembly 12, second rack assembly 13, baffle 14, first counterweight 15, second counterweight 16, wire winding wheel 17, mounting column 18, rotating block 19, spring 20, pulling rope 21, U-shaped wire clamp 22, chute 23, roller mechanism 24, warning panel 25. Detailed implementation manners

[0031] Embodiment 1

[0032] As Figures 1 to 7 shown, a windbreak for a double-layer truss bridge of the present invention is arranged on both sides and / or the central isolation belt of the bridge, and includes a plurality of spliced windbreak units. The windbreak unit includes a windbreak column 4, a plurality of windbreak strips 9, a skateboard 5, a first rack assembly 6, a second rack assembly 13, a plurality of first columnar gear assemblies 7, a second columnar gear assembly 12, a wind power driving element and a traction element;

[0033] The windbreak columns 4 are arranged at both ends of the windbreak unit, and one end of the windbreak column 4 is connected to the bridge deck 3. The two side surfaces in the width direction of the sliding plate 5 are slidably arranged on the inner walls of the windbreak columns 4. The first rack assembly 6 and the second rack assembly 13 are oppositely arranged on the two side surfaces in the length direction of the windbreak columns 4. A number of first columnar gear assemblies 7 and second columnar gear assemblies 12 are respectively arranged outside the first rack assembly 6 and the second rack assembly 13, and both ends of the number of first columnar gear assemblies 7 and second columnar gear assemblies 12 are rotatably connected to the side surfaces of the windbreak columns 4. Specifically, they are rotatably connected through the second rotating shaft 8. A number of windbreak strips 9 are evenly arranged between the windbreak columns 4, and the ends of the number of windbreak strips 9 are respectively connected to the second rotating shafts 8 at the ends of the corresponding first columnar gear assemblies 7. The wind power driving element is connected to one end of the second columnar gear assembly 12, and the traction element is arranged at the lower end of the sliding plate 5 to control the traction torque and sliding distance required for the sliding of the sliding plate 5.

[0034] It should be noted that in this specific embodiment, the first rack assemblies 6 are evenly arranged on the sliding plate 5, and the first rack assemblies 6 are meshed and connected with a number of first gear assemblies, that is, the windbreak strips 9 will not rotate under the action of wind power. Therefore, the rack and the gear have a certain self-locking function. Only when the first rack group drives the first gear group to rotate, the windbreak strips 9 will rotate, thereby adjusting the ventilation rate.

[0035] Therefore, the working principle of this technical solution is as follows:

[0036] Under the action of the wind power driving element, the second columnar gear assembly 12 is driven to rotate. Then, the rotating columnar gear assembly will be meshed with the second rack assembly 13, thereby driving the sliding plate 5 to move. The movement of the sliding plate 5 will drive the first rack assembly 6 to move, that is, in the meshed state, it will drive the first columnar gear assembly 7 to rotate, thereby driving the windbreak strips 9 to rotate. Furthermore, when the external wind power is relatively large, the windbreak strips 9 are rotated, thereby adjusting the ventilation rate and reducing the acting force and influence of the wind power on the bridge deck 3.

[0037] The shape of the windbreak column 4 is U-shaped, and it can be selected as U-shaped steel. A number of chutes 23 are provided on both side surfaces of the windbreak column 4, and a number of roller mechanisms 24 are arranged in the chutes 23. The two side surfaces in the width direction of the sliding plate 5 are connected to the roller mechanisms 24. This sliding setting method not only has good sliding effect, but also can limit the position of the sliding plate 5 to ensure the meshing effect of the gear and the rack.

[0038] A baffle 14 is provided at the lower end of the chute 23. The sliding plate 5 is arranged above the baffle 14, and the traction element is arranged below the baffle 14. A through hole is provided on the baffle 14. The traction element includes a counterweight and a traction rope. One end of the traction rope is connected to the counterweight, and the other end of the traction rope passes through the through hole and is fixed to the lower end face of the sliding plate 5. When the wind acts on the wind power driving element, if the wind force level is sufficient and the force of the wind acting on the rotating blade 11 is greater than the weight of the counterweight, the sliding plate 5 will move upward, thereby realizing the rotation of the wind barrier strip 9. It should be noted that when the counterweight is blocked by the baffle 14, at this time the wind barrier strip 9 rotates by 90°, presenting the maximum ventilation rate. The setting of the counterweight here can be matched with the wind force level, and thus the wind force level when the wind barrier strip 9 rotates can be set.

[0039] The wind power driving element includes a first rotating shaft 10 and a plurality of rotating blades 11. Both ends of the first rotating shaft 10 are rotatably connected to the wind barrier column 4 and are connected to the end of the second columnar gear assembly 12. The rotating blades 11 are evenly fixed on the first rotating shaft 10. The setting method of the rotating blades 11 and the first rotating shaft 10 is simple and easy to implement in this solution. It should be noted that the blade setting method of the rotating blades 11 can control the rotation direction of the rotating blades 11, and thus control the moving direction of the sliding plate 5. In this specific embodiment, the sliding plate 5 can only slide in one direction, that is, when the rotating blades 11 are affected by the wind on one side, they can only rotate in one direction. Therefore, this wind barrier is optimally arranged on one side of the bridge with a single-sided windward surface; of course, if you want to use it on both sides, only simple design changes are needed in this technical solution. Of course, the wind power driving element can also be replaced by a rotating motor, a sensor, etc., which can be judged according to the actual situation and the convenience of electricity.

[0040] A warning mechanism is provided on the outer side surface of the wind barrier column 4 near the bridgehead. The warning mechanism includes a warning panel 25, a wire winding wheel 17, a pull rope 21, a mounting column 18, a rotating block 19 and a spring 20. The wire winding wheel 17 is fixed to the end of the first rotating shaft 10. One end of the mounting column 18 is fixed to the wind barrier column 4, and the rotating block 19 is rotatably connected to the other end of the mounting column 18. The warning panel 25 is fixedly connected to the rotating block 19. One end of the spring 20 is fixed to the mounting column 18, and the other end is fixed to the rotating block 19. One end of the pull rope 21 is fixed to the wire winding wheel 17, and the other end of the pull rope 21 is fixed to the rotating block 19.

[0041] When the first rotating shaft 10 rotates to drive the sliding plate 5 to slide to the extreme position, causing the wind barrier strip 9 to flip to the maximum ventilation rate, the length of the rope wound around the winding wheel 17 just makes the warning panel 25 rotate 90°. Therefore, when the wind force level is too high, the warning panel 25 will rotate towards the oncoming vehicle direction, warning the driver and avoiding accidents when the vehicle crosses the bridge. When the wind force decreases, under the action of the counterweight, the sliding plate 5 will reset, that is, the first rotating shaft 10 will rotate in the reverse direction, releasing the wound rope 21. That is, under the action of the spring 20, the warning panel 25 will rotate and reset. Preferably, a U-shaped wire clip 22 is provided on the wind barrier column 4, and the rope 21 passes through the U-shaped wire clip 22 and is fixed to the winding wheel 17, guiding the rope 21 and making it easy to wind around the winding wheel 17.

[0042] It should be further explained that to achieve bilateral use of this device, that is, to adjust the ventilation rate when facing bilateral winds, its specific structure can be simply designed based on this technology. For example, remove the baffle 14 and replace the counterweight with a spring. That is, the two ends of the spring are respectively fixedly connected to the bottom end of the wind barrier column 4 and the sliding plate 5. Then, the spring compression and the rope 21 can correspond to the wind force level. At this time, a limit block needs to be set on the chute 23 to limit the moving distance of the sliding plate 5, thereby controlling the rotation angle of the sliding plate 5.

[0043] Embodiment 2

[0044] The difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 can match the upper wind barrier strip 9 and the lower wind barrier strip 9 with the wind force level and then adjust them separately. Specifically, the first rack assembly 6 includes an upper rack assembly 61 and a lower rack assembly 62, and the first columnar gear assembly 7 includes an upper gear assembly 71 and a lower gear assembly 72. The upper gear assembly 71 is meshed with the upper rack assembly 61. There is a sliding distance between the lower rack assembly 62 and the lower gear assembly 72. When the upper rack assembly 61 drives the upper gear assembly 71 to rotate 45°, the lower rack assembly 62 comes into meshing contact with the lower gear assembly 72. When the upper rack assembly 61 drives the upper gear assembly 71 to rotate 90°, the lower rack assembly 62 drives the lower gear assembly 72 to rotate 90°. That is, when the upper gear assembly 71 rotates 45°, the lower gear assembly 72 rotates 90°. This can be achieved by setting different gears and racks for the upper and lower parts. The traction element includes a first counterweight 15 and a second counterweight 16 that are matched with the wind force level.

[0045] It should be noted that in this design method, the upper gear assembly 71 and the upper rack assembly 61 are matched, and the lower gear assembly 72 and the lower rack assembly 62 are matched. The matching means that meshing can be achieved. At the same time, in order to make the rotation angles of the upper wind barrier strip 9 and the lower wind barrier strip 9 different when the slide plate 5 moves the same displacement, it is necessary to set the spacing and size of the rack and the gear, which is the prior art and will not be elaborated here.

[0046] By setting the first counterweight 15 and the second counterweight 16, two wind force levels can be corresponding. When the wind force level matches the first counterweight 15, the upper rack assembly 61 drives the upper gear assembly 71 to rotate, and the upper wind barrier strip 9 can be flipped open, thereby adjusting the upper ventilation rate. When the wind force level continues to increase, the second counterweight 16 will be driven to move upward. At this time, the lower rack assembly 62 will move, and then drive the lower gear assembly 72 to rotate, so as to realize the rotation and opening of the lower wind barrier strip 9. Therefore, the setting of this technical solution can realize the corresponding opening of the upper and lower wind barrier strips 9 according to the wind force level. It can be understood that when the wind force level is relatively large, the opening of the upper wind barrier strip 9 can reduce the effect of the wind force on the bridge. At the same time, due to the existence of the lower wind barrier strip 9, although the vehicle will be affected by a certain lateral wind, the vehicle can still drive on the bridge, which is equivalent to taking a compromise state between the force on the bridge and the force on the vehicle.

[0047] A torsion spring is provided on the end of the wind barrier strip 9 connected to the lower gear assembly 72. Since the lower gear group and the lower rack group do not contact at the beginning, they do not have the ability to interlock. Therefore, setting the torsion spring can control the magnitude of the initial rotation force, so that the lower wind barrier strip 9 rotates after the lower gear group and the lower rack group come into contact.

[0048] Finally, this wind barrier device can be arranged on the side, in the central division of the double-deck truss bridge 1, or installed on the guardrail 2, and can be selected according to the actual situation. Of course, if you want to realize the bilateral use of the wind barrier in Embodiment 2, on the basis of adding a spring, it is only necessary to symmetrically arrange the upper rack assembly 61 and the lower rack assembly 62 on the slide plate 5 with respect to the plane where the axes of the upper gear assembly 71 and the lower gear assembly 72 are located.

[0049] It should be further noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A wind barrier for a double-deck truss bridge, which is arranged on both sides and / or the central divider of the bridge, and is characterized in that: It includes several spliced windbreak units, and each windbreak unit includes windbreak columns, several windbreak strips, a sliding plate, a first rack assembly, a second rack assembly, several first columnar gear assemblies, a second columnar gear assembly, a wind power driving element and a traction element; The windbreak columns are arranged at both ends of the windbreak unit, and one end of each windbreak column is connected to the bridge deck. The two side surfaces in the width direction of the sliding plate are slidably arranged on the inner walls of the windbreak columns. The first rack assembly and the second rack assembly are oppositely arranged on the two side surfaces in the length direction of the windbreak columns. Several of the first columnar gear assemblies and the second columnar gear assembly are respectively arranged outside the first rack assembly and the second rack assembly, and both ends of several of the first columnar gear assemblies and the second columnar gear assembly are rotatably connected to the side surfaces of the windbreak columns. Several of the windbreak strips are evenly arranged between the windbreak columns, and the ends of several of the windbreak strips are respectively connected to the ends of the corresponding first columnar gear assemblies. The wind power driving element is connected to one end of the second columnar gear assembly. The traction element is arranged at the lower end of the sliding plate to control the traction torque and sliding distance required for the sliding of the sliding plate; The wind power driving element includes a first rotating shaft and several rotating blades. Both ends of the first rotating shaft are rotatably connected to the windbreak columns and are connected to the end of the second columnar gear assembly. The rotating blades are evenly fixed on the first rotating shaft; The first rack assembly includes an upper rack assembly and a lower rack assembly. The first columnar gear assembly includes an upper gear assembly and a lower gear assembly. The upper gear assembly is meshed with the upper rack assembly. There is a sliding distance between the lower rack assembly and the lower gear assembly. When the upper rack assembly drives the upper gear assembly to rotate 45°, the lower rack assembly and the lower gear assembly are in meshing contact. When the upper rack assembly drives the upper gear assembly to rotate 90°, the lower rack assembly drives the lower gear assembly to rotate 90°. The traction element includes a first counterweight block and a second counterweight block that are matched with the wind force level; a torsion spring is provided at the end of the windbreak strip connected to the lower gear assembly.

2. The wind barrier for a double-deck truss bridge according to claim 1, wherein: The shape of the windbreak column is U-shaped. There are sliding grooves on both side surfaces of the windbreak column, and several roller mechanisms are arranged in the sliding grooves. The two side surfaces in the width direction of the sliding plate are connected to the roller mechanisms.

3. The wind barrier for a double-deck truss bridge according to claim 2, wherein: A baffle is provided at the lower end of the sliding groove. The sliding plate is arranged above the baffle, and the traction element is arranged below the baffle. There is a through hole on the baffle. The traction element includes a counterweight block and a traction rope. One end of the traction rope is connected to the counterweight block, and the other end of the traction rope passes through the through hole and is fixed to the lower end surface of the sliding plate.

4. The wind barrier for a double-deck truss bridge according to claim 1, characterized in that: A warning mechanism is provided on the outer side of the windbreak column near the bridgehead. The warning mechanism includes a warning panel, a wire winding wheel, a pulling rope, a mounting column, a rotating block and a spring. The wire winding wheel is fixed to the end of a first rotating shaft. One end of the mounting column is fixed to the windbreak column. The rotating block is rotatably connected to the other end of the mounting column. The warning panel is fixedly connected to the rotating block. One end of the spring is fixed to the mounting column and the other end is fixed to the rotating block. One end of the pulling rope is fixed to the wire winding wheel and the other end of the pulling rope is fixed to the rotating block.

5. The wind barrier for a double-deck truss bridge according to claim 4, characterized in that: A U-shaped wire clamp is provided on the windbreak column, and the pulling rope passes through the U-shaped wire clamp and is fixed to the wire winding wheel.

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