Bridge stress control system for suppressing vortex vibration

Abstract

The present invention discloses a bridge stress control system for suppressing vortex vibration, including a logic control unit, a nozzle unit and a wind force detection unit; the nozzle units are arranged in parallel on both sides of the bridge main beam along the longitudinal direction of the bridge to provide vertical force for the bridge; the wind force detection units are distributed on the upper and lower parts of the bridge to detect wind direction and wind speed; the logic control unit controls the rotation angle of the nozzle unit according to the detected wind speed of the upper and lower parts of the bridge; a first stress detection unit can also be arranged to detect the vertical stress of the bridge or a displacement detection unit can be arranged to detect the strain of the bridge to control the nozzle unit; a transverse guide unit can also be arranged on both sides of the bridge main beam to cooperate with the nozzle unit to control wind force. The present invention can adjust the rotation angle of the nozzle unit or the transverse guide unit according to parameters such as wind speed, stress, strain, etc. through the logic control unit, make full use of natural wind to control the stress and strain inside the bridge, improve the safety and life of the bridge, and improve the safety factor of the bridge.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a bridge stress control system for suppressing vortex vibration. Background Art

[0002] A suspension bridge, also known as a suspension bridge, refers to a bridge with cables (or steel chains) suspended from towers and anchored on both banks (or both ends of the bridge) as the main load-bearing components of the superstructure. The geometric shape of the cables is determined by the force balance condition and is generally close to a parabola. Many hangers are hung from the cables to suspend the bridge deck. Stiffening beams are often set between the bridge deck and the hangers to form a combined system with the cables to reduce the deflection deformation caused by the load. Suspension bridges can make full use of the strength of materials and have the characteristics of saving materials and light weight. They are particularly suitable for situations with large spans or difficult piers. However, due to its low structural stiffness, vortex vibration is easily generated under load, especially wind load, which brings greater stress to the bridge and causes bridge vibration. Therefore, wind-induced stability is an important control factor in bridge construction, especially suspension bridge construction.

[0003] The prior art adjusts the shape of the stiffening beam section through aerodynamic selection and aerodynamic optimization, such as adding auxiliary guide devices such as guide plates, wind nozzles or flow suppression plates, so as to achieve the purpose of suppressing the regular vortex shedding on the surface of the stiffening beam, reduce the internal stress of the bridge, and improve the flutter stability of the suspension bridge. Based on this, the patent document with application number 201621413540.3 discloses a wind nozzle structure for vortex vibration control of a separated double-box girder bridge, the cross section of which is mainly composed of a trapezoid and a triangle, the lower bottom of the trapezoid is connected to the main beam of the bridge, and the upper bottom of the trapezoid is connected to the shortest side of the triangle; the triangle is a right triangle, and the hypotenuse of the right triangle is located below the long right-angled side; the wind nozzle structure is composed of a thin-walled steel box; in order to reduce the amplitude of the vortex-induced resonance of the bridge and improve the safety of the bridge structure. However, the diversion form of this scheme is relatively fixed, lacks adjustability or controllability for the actual wind-induced vibration changes of the built bridge, and the vibration suppression effect is not prominent, resulting in a low safety factor of the bridge. Summary of the invention

[0004] Based on this, it is necessary to provide a bridge stress control system for suppressing vortex vibration based on a wind nozzle unit and wind speed difference detection to address the above problems, which can actively adjust the wind nozzle angle according to wind speed and wind direction to improve the safety factor of the bridge; and a bridge stress control system based on a wind nozzle unit and bridge stress detection, which can actively adjust the wind nozzle angle according to the tension value of the hanger to improve the safety factor of the bridge; and a bridge stress control system based on a wind nozzle unit and bridge displacement detection, which can actively adjust the wind nozzle angle according to the longitudinal displacement of the bridge tower to improve the safety factor of the bridge.

[0005] The present invention is achieved through the following technical solutions:

[0006] A bridge stress control system for suppressing vortex vibration, comprising a logic control unit, a plurality of wind nozzle units and a plurality of wind force detection units;

[0007] The nozzle units are arranged in parallel on both sides of the bridge main beam along the longitudinal direction of the bridge and connected to the bridge main beam, and the connection ends of the nozzle units with the bridge main beam rotate around the longitudinal direction of the bridge as the axis;

[0008] Wind detection units are distributed on the upper and lower parts of the bridge to detect wind direction and wind speed;

[0009] The wind nozzle unit and the wind force detection unit are respectively connected to the logic control unit, and the logic control unit controls the rotation angle of the wind nozzle unit according to the wind speeds at the upper and lower parts of the bridge detected by the wind force detection unit.

[0010] In one embodiment, when the bridge is a suspension bridge, it further includes a plurality of first stress detection units, which are distributed on the bridge hangers and are used to detect the tension exerted on the bridge hangers;

[0011] The first stress detection unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the nozzle unit according to the tension detected by the first stress detection unit.

[0012] In one embodiment, it further includes a displacement detection unit, which is disposed on the upper part of the bridge tower and is used to detect the longitudinal displacement of the bridge on the upper part of the bridge tower;

[0013] The displacement detection unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the wind nozzle unit according to the longitudinal displacement of the bridge on the bridge tower detected by the displacement detection unit.

[0014] A bridge stress control system for suppressing vortex vibration, the bridge is a suspension bridge, comprising a logic control unit, a plurality of wind nozzle units and a plurality of first stress detection units;

[0015] The nozzle units are arranged in parallel on both sides of the bridge main beam along the longitudinal direction of the bridge and connected to the bridge main beam, and the connection ends of the nozzle units with the bridge main beam rotate around the longitudinal direction of the bridge as the axis;

[0016] The first stress detection unit is distributed on the bridge hanger and is used to detect the tension exerted on the bridge hanger;

[0017] The nozzle unit and the first stress detection unit are respectively connected to the logic control unit, and the logic control unit controls the rotation angle of the nozzle unit according to the tension detected by the first stress detection unit.

[0018] A bridge stress control system for suppressing vortex vibration, comprising a logic control unit, a displacement detection unit and a plurality of wind nozzle units;

[0019] The nozzle units are arranged in parallel on both sides of the bridge main beam along the longitudinal direction of the bridge and connected to the bridge main beam, and the connection ends of the nozzle units with the bridge main beam rotate around the longitudinal direction of the bridge as the axis;

[0020] The displacement detection unit is arranged on the upper part of the bridge tower, and is used to detect the longitudinal displacement of the bridge on the upper part of the bridge tower;

[0021] The wind nozzle unit and the displacement detection unit are respectively connected to the logic control unit, and the logic control unit controls the rotation angle of the wind nozzle unit according to the longitudinal displacement of the bridge on the bridge tower detected by the displacement detection unit.

[0022] In one embodiment, the nozzle unit includes an active plate, a driven plate and a first driving mechanism, wherein the active plate is connected to the first driving mechanism and rotates with the longitudinal direction of the bridge as the axis under the drive of the first driving mechanism;

[0023] The driven plate is arranged on the upper and lower sides of the active plate, one end of which is movably connected to the bridge main beam, and the other end of the driven plate is covered on the active plate and can slide along the active plate.

[0024] In one embodiment, it further comprises a plurality of transverse flow guiding units, which are arranged at intervals on both sides of the bridge main beam along the longitudinal direction of the bridge to offset the horizontal force caused by the wind load;

[0025] The transverse guide unit includes a second driving mechanism and a first guide plate, wherein the first guide plate is connected to the second driving mechanism and rotates with the vertical direction of the bridge as the axis under the drive of the second driving mechanism;

[0026] The lateral air guide unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the lateral air guide unit according to the wind speed detected by the wind force detection unit.

[0027] In one of the embodiments, the lateral guide unit also includes a third driving mechanism, which is connected to the second driving mechanism and rotates around the vertical direction of the bridge under the drive of the second driving mechanism; the first guide plate is connected to the third driving mechanism and rotates around the transverse direction of the bridge under the drive of the third driving mechanism.

[0028] In one embodiment, the lateral guide unit also includes a fourth driving mechanism and a second guide plate. The fourth driving mechanism is connected to the second driving mechanism, and rotates around the vertical direction of the bridge under the drive of the second driving mechanism; the second guide plate is connected to the fourth driving mechanism, and rotates around the longitudinal direction of the bridge under the drive of the fourth driving mechanism.

[0029] In one embodiment, it further comprises a plurality of second stress detection units, which are distributed on the bridge main beam and are used to detect the stress on the bridge main beam;

[0030] The second stress detection unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the lateral guide unit according to the stress detected by the second stress detection unit.

[0031] Compared with the prior art, the technical solution of the present invention has at least the following advantages and beneficial effects:

[0032] The present invention detects the wind direction and wind speed at the upper and lower parts of the bridge through a wind force detection unit, and transmits the wind speed to a logic control unit. The logic control unit adjusts the rotation angle of the wind nozzle unit according to the wind speed difference between the upper and lower parts of the bridge, so as to partially offset the vertical pressure or vertical lift caused by the wind speed difference, suppress the vortex vibration effect caused by wind load, and improve the safety factor of the bridge.

[0033] The present invention detects the tension exerted on the bridge hanger through the first stress detection unit, and transmits the tension value to the logic control unit. The logic control unit adjusts the rotation angle of the wind nozzle unit according to the tension value, and uses the wind load to provide a certain vertical force for the bridge, so as to reduce the load borne by the bridge hanger and improve the safety factor of the bridge.

[0034] The present invention detects the longitudinal displacement of the bridge on the upper part of the bridge tower through a displacement detection unit, and transmits the longitudinal displacement of the bridge to a logic control unit. The logic control unit adjusts the rotation angle of the wind nozzle unit according to the longitudinal displacement of the bridge, and uses the wind load to provide a certain vertical force for the bridge, thereby reducing the load borne by the bridge and improving the safety factor of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A general layout diagram of a bridge-shaped structure of a bridge stress control system provided by an embodiment of the present invention;

[0037] Figure 2 A cross-sectional view of a bridge main beam section provided by an embodiment of the present invention;

[0038] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0039] Figure 4 for Figure 2 The enlarged schematic diagram of point B in the middle;

[0040] Figure 5 A schematic structural diagram of another lateral air guide unit provided in an embodiment of the present invention.

[0041] Icons: 1-nozzle unit, 11-active plate, 12-driven plate, 13-first driving mechanism, 131-first motor, 132-second rotating shaft, 14-torsion spring, 2-wind force detection unit, 3-first stress detection unit, 4-displacement detection unit, 5-lateral guide unit, 51-second driving mechanism, 511-second motor, 512-second rotating shaft, 52-first guide plate, 53-third driving mechanism, 531-third motor, 532-third rotating shaft, 54-fourth driving mechanism, 541-fourth motor, 542-fourth rotating shaft, 55-second guide plate, 6-second stress detection unit, 100-bridge main beam, 200-bridge tower, 300-bridge cable, 400-bridge hanger. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, a bridge stress control system for suppressing vortex vibration will be described more clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. The preferred embodiments of the bridge stress control system are shown in the accompanying drawings, but the bridge stress control system can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the bridge stress control system more thorough and comprehensive.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. If the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are used to indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when used, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present invention, it is also necessary to explain that the terms "set", "install", "connect", and "connect" used herein should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] It can be understood that, in the present solution, the longitudinal direction of the bridge refers to the length direction of the bridge; the transverse direction of the bridge refers to the width direction of the bridge; and the vertical direction of the bridge refers to the vertical direction of the bridge.

[0047] like Figure 1 and Figure 2 As shown, the present invention provides a bridge stress control system for suppressing vortex vibration, including a logic control unit (not shown in the figure), a plurality of wind nozzle units 1 and a plurality of wind force detection units 2; the wind nozzle units 1 are arranged in parallel on both sides of the bridge main beam 100 along the longitudinal direction of the bridge, and are connected to the bridge main beam 100, and the connection ends thereof with the bridge main beam 100 can rotate around the longitudinal direction of the bridge; the wind force detection units 2 are distributed at the upper and lower parts of the bridge, and are used to detect wind direction and wind speed; the wind nozzle units 1 and the wind force detection units 2 are respectively connected to the logic control unit, and the logic control unit controls the rotation angle of the wind nozzle unit 1 according to the wind speeds at the upper and lower parts of the bridge detected by the wind force detection unit 2.

[0048] Specifically, the wind force detection unit 2 can be a wind speed detector. When the wind force detection unit 2 detects the wind direction and wind speed of the upper and lower parts of the bridge, the wind direction data and wind speed data obtained will be transmitted to the logic control unit. It can be understood that the logic control unit can perform parameter recognition on the wind direction data and wind speed data transmitted by the wind force detection unit 2, and obtain and output the corresponding control signal to the nozzle unit 1 through the algorithm, so that the corresponding nozzle unit 1 can make real-time feedback movement. The logic control unit controls the nozzle unit 1 by controlling each nozzle unit 1 individually, or by controlling multiple consecutive nozzle units 1 in sections, so as to make reasonable angle adjustments according to different wind speeds in different sections, and can also control all nozzle units 1 as a whole.

[0049] For example, when the wind speed on the upper part of the bridge is greater than the wind speed on the lower part of the bridge (such as the wind speed on the upper part of the bridge is 14M / S, and the wind speed on the lower part of the bridge is 5M / S), the wind nozzle unit 1 on the windward side is controlled to rotate upward (such as rotating 30 degrees upward along the connection end between the wind nozzle unit 1 and the bridge main beam 100), so that the wind load impacts the lower side of the wind nozzle unit 1 on the windward side, providing a certain vertical lift for the bridge, partially offsetting the vertical pressure caused by the high wind speed on the upper side; and vice versa. When there is a difference in wind speed between the left and right sides of the bridge, the corresponding angle adjustment is performed according to the corresponding upper and lower wind speed difference between the left and right sides, that is, the greater the corresponding upper and lower wind speed difference on the side, the greater the adjustment range of the wind nozzle unit 1; if the wind speeds on the left and right sides of the upper part of the bridge are consistent and greater than the wind speed on the lower part of the bridge, and the wind speed on the left side of the lower part of the bridge is less than the wind speed on the right side of the lower part of the bridge (such as the wind speeds on the left and right sides of the upper part of the bridge are consistent, which is 14M / S, the wind speed on the left side of the lower part of the bridge is 5M / S, and the wind speed on the right side of the lower part of the bridge is 8M / S), the wind nozzle unit 1 on the left side of the windward side is controlled to rotate upward, and the wind nozzle unit 1 on the right side of the windward side is controlled to rotate upward, and the rotation range of the left wind nozzle unit 1 is greater than the rotation range of the right wind nozzle unit 1 (such as controlling the wind nozzle unit 1 on the left side of the windward side to rotate upward by 30 degrees, and controlling the wind nozzle unit 1 on the right side of the windward side to rotate upward by 20 degrees), so as to achieve a corresponding reasonable suppression effect. It can be understood that the specific values ​​in the above brackets are assumed values ​​and are only used to explain the text outside the brackets.

[0050] It is understandable that, generally speaking, the above-mentioned suppression effect can be achieved by adjusting only the windward side wind nozzle unit 1; and by adjusting the leeward side wind nozzle unit 1 through a more complex control algorithm, a better technical effect can be achieved. For example, in the vertical direction, when the wind speed on the upper part of the bridge is greater than the wind speed on the lower part of the bridge, the wind nozzle unit 1 on the windward side is controlled to rotate upward, and the wind nozzle unit 1 on the leeward side is controlled to rotate downward, so that both sides of the bridge main beam 100 can obtain a certain vertical lift, which can better offset the vertical pressure caused by the high wind speed on the upper side. In addition, in order to deal with the vortex-induced resonance phenomenon caused by the consistency between the natural frequency of the bridge and the wind vibration frequency under specific and stable wind speeds, the rotation angle of the wind nozzle unit 1 can be actively controlled to change the wind vibration frequency of the bridge and eliminate the resonance; the active control method includes but is not limited to setting a preset time in the logic control unit, and monitoring the wind speed data provided by the wind force detection unit 2 through the logic control unit. When the wind speed in the upper and lower parts of the bridge is continuously stable and the duration exceeds the preset time, a control signal is output to the wind nozzle unit 1 to actively change the rotation angle of the wind nozzle unit 1 to change the stress condition of the bridge.

[0051] It can also be understood that the above-mentioned upper part of the bridge includes the upper part of the bridge tower 200, such as the top of the bridge tower 200, the upper half of the bridge tower 200 with the bridge deck as the dividing point, etc.; the lower part of the bridge includes the lower part of the bridge tower 200 (such as the lower half of the bridge tower 200 with the bridge deck as the dividing point) and / or the side of the bridge main beam 100. Moreover, when the wind force detection unit 2 is set on the side of the bridge main beam 100, the distance between every two bridge towers 200 is a setting section, and the wind force detection unit 2 can be set at one quarter, one half and three quarters of the setting section respectively, so as to accurately measure the wind speed in sections.

[0052] Further, such as Figures 1 to 3 As shown, in this embodiment, the nozzle unit 1 includes an active plate 11, a driven plate 12 and a first driving mechanism 13. The first driving mechanism 13 can be a combination of a power source (such as a first motor 131) and a rotating shaft (such as a second rotating shaft 132) connected by a gear or a belt. The rotating shaft of the first driving mechanism 13 is arranged along the longitudinal direction of the bridge, and its axis is parallel to the longitudinal direction of the bridge. One side of the active plate 11 is fixedly connected to the rotating shaft of the first driving mechanism 13, and rotates around the longitudinal direction of the bridge under the drive of the power source of the first driving mechanism 13; the active plate 11 is streamlined, and its end away from the bridge main beam 100 is acute-angled, so that the airflow can flow to the upper and lower sides of the bridge main beam 100 along the active plate 11; the driven plate 12 is a plurality of driving mechanisms 13, and the first driving mechanism 13 ... The plate 12 is arranged on the upper and lower sides of the active plate 11, and one end thereof is movably connected to the bridge main beam 100. The other end of the driven plate 12 is covered on the active plate 11, closely attached to the active plate 11 and can slide along the active plate 11. For example, a torsion spring 14 can be used to realize the movable connection between the driven plate 12 and the bridge main beam 100. The torsion spring 14 is deformed and arranged on the inner side of the side of the bridge main beam 100, one end is fixed on the inner side of the bridge main beam 100, and the other end is fixed on the inner side of the driven plate 12. The driven plate 12 is pressed and held tightly against the plate surface of the active plate 11 by the stress generated by the torsion spring 14 to restore its original state, thereby ensuring that the airflow at the connection between the nozzle unit 1 and the bridge main beam 100 can smoothly transition and avoid generating vortices or causing impact on the connection.

[0053] Preferably, Figure 3 As shown, the active plate 11 is a closed hollow structure to reduce its own weight and facilitate timely rotation.

[0054] Further, such as Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, it also includes a plurality of transverse guide units 5, which are arranged at intervals on both sides of the bridge main beam 100 along the longitudinal direction of the bridge to offset the horizontal force caused by the wind load; the transverse guide unit 5 can be arranged above the wind nozzle unit 1 for easy installation, replacement and maintenance, and can also be arranged at the bottom of the bridge main beam 100 to avoid affecting the vision of vehicles passing through the bridge deck, which is more beautiful; the transverse guide unit 5 includes a second driving mechanism 51 and a first guide plate 52, the first guide plate 52 is connected to the second driving mechanism 51, and is driven by the second driving mechanism 51 to rotate around the vertical direction of the bridge as the axis. In this embodiment, the second driving mechanism 51 can be a combination of a power source (such as a second motor 511) and a rotating shaft (such as a second rotating shaft 512) connected by a gear or a belt. The rotating shaft of the second driving mechanism 51 is arranged along the vertical direction of the bridge, that is, its axis is parallel to the vertical direction of the bridge. One side of the first guide plate 52 is fixedly connected to the second rotating shaft 512, and rotates with the vertical direction of the bridge as the axis under the drive of the second motor 511; the transverse guide unit 5 is connected to the logic control unit, and the logic control unit controls the rotation angle of the transverse guide unit 5 according to the wind speed detected by the wind force detection unit 2. In addition, the second rotating shaft 512 can be arranged in the middle of the first guide plate 52, so that the force on both sides of the second rotating shaft 512 is uniform.

[0055] Specifically, it can be understood that the logic control unit can perform parameter recognition on the wind direction data and wind speed data transmitted by the wind force detection unit 2, and then obtain and output the corresponding control signal to the lateral guide unit 5 through an algorithm, so that the corresponding lateral guide unit 5 can make real-time feedback movement. The logic control unit can control the lateral guide unit 5 by individually controlling each lateral guide unit 5, or by segmenting a plurality of continuous lateral guide units 5 to make reasonable angle adjustments according to different wind speeds in different sections, and can also control all lateral guide units 5 as a whole.

[0056] Since some suspension bridges have large spans, in order to ensure structural strength, the bridge beam 100 of the suspension bridge is usually slightly arched, and the nozzle unit 1 is also slightly arched on the side of the bridge beam 100. Therefore, when the angle of the nozzle unit 1 is adjusted, the non-horizontally set nozzle unit 1 will be subject to vertical and horizontal forces brought by wind loads. When there is a difference in wind speed on both sides of the bridge longitudinally, it will bring longitudinal forces to the bridge. After overloading, the bridge tower 200 will produce longitudinal displacement, affecting the structural safety.

[0057] For example, Figure 1 , Figure 2 and Figure 4As shown, when the transverse guide unit 5 is not activated, the plate surface of the first guide plate 52 is parallel to the horizontal direction of the bridge to avoid affecting the wind passing through the lower side of the bridge. When the wind speed on the upper part of the bridge is consistent on both sides and is greater than the wind speed on the lower part of the bridge, and there is a difference in wind speed between the left and right sides of the lower part of the bridge, such as when the wind speed on the left side of the lower part of the bridge is greater than the wind speed on the right side of the lower part of the bridge, the bridge will be subjected to a leftward force in the longitudinal direction of the bridge. At this time, the first guide plate 52 is controlled to rotate to the left by a certain angle, so that the wind load can impact the left side of the first guide plate 52, providing a rightward force for the bridge in the longitudinal direction of the bridge, which partially offsets the leftward force caused by the aforementioned wind speed difference, and achieves a reasonable suppression effect.

[0058] Further, such as Figure 1 , Figure 2 and Figure 4 As shown, the transverse guide unit 5 further includes a third driving mechanism 53, which is connected to the second driving mechanism 51, and the first guide plate 52 is connected to the third driving mechanism 53, so that the first guide plate 52 rotates with the horizontal direction of the bridge as the axis under the drive of the third driving mechanism 53, and the first guide plate 52 and the third driving mechanism 53 rotate with the vertical direction of the bridge as the axis under the drive of the second driving mechanism 51. In addition, the first guide plate 52 and the third rotating shaft 532 can be symmetrically arranged on both sides of the second rotating shaft 512, so that the forces on both sides of the second rotating shaft 512 are uniform.

[0059] Similarly, since the nozzle unit 1 is slightly arched on the side of the bridge main beam 100, there will be a gap between adjacent nozzle units 1 when adjusting the angle, so that the actual vertical force is slightly lower than the ideal vertical force. Although the vertical force can be increased by increasing the adjustment angle of the nozzle unit 1, the lateral force on the bridge will also increase, which will have a certain impact on the structural safety of the bridge. Therefore, the first guide plate 52 can be rotated with the transverse direction of the bridge as the axis through the third driving mechanism 53, that is, it has a similar technical effect as the nozzle unit 1, providing a certain vertical force for the bridge. When the lateral guide unit 5 is not activated, the plate surface of the first guide plate 52 is parallel to the transverse direction and the longitudinal direction of the bridge at the same time, so as to avoid the wind from passing through the lower side of the bridge. The force exerted on the first guide plate 52.

[0060] Specifically, in this embodiment, the second driving mechanism 51 can be a combination of a power source (such as a second motor 511) and a rotating shaft (such as a second rotating shaft 512) connected by gears or belts, and the second rotating shaft 512 is arranged vertically along the bridge, that is, its axis is parallel to the vertical direction of the bridge; the third driving mechanism 53 is also a combination of a power source (such as a third motor 531) and a rotating shaft (such as a third rotating shaft 532) connected by gears or belts, and the third rotating shaft 532 is arranged horizontally along the bridge, that is, its axis is parallel to the horizontal direction of the bridge. At this time, the third rotating shaft 532 and the second rotating shaft 512 are perpendicular to each other, and one side of the first guide plate 52 is fixedly connected to the third rotating shaft 532. Driven by the third motor 531, the first guide plate 52 rotates with the horizontal direction of the bridge as the axis, and driven by the second motor 511, the first guide plate 52 and the third rotating shaft 532 rotate with the vertical direction of the bridge as the axis. When activated, the third driving mechanism 53 is controlled to rotate the first guide plate 52 to be perpendicular to the longitudinal direction of the bridge, and then the second driving mechanism 51 is controlled to rotate the second rotating shaft 512 to adjust the angle, and the first guide plate 52 is rotated to the required angle to offset the horizontal force brought by the wind load; finally, the third driving mechanism 53 is controlled to rotate the third rotating shaft 532 to adjust the angle, and the first guide plate 52 is rotated to the required angle to provide a certain vertical force for the bridge.

[0061] Further, such as Figure 1 , Figure 2 and Figure 5 As shown, the transverse guide unit 5 also includes a fourth driving mechanism 54 and a second guide plate 55. The fourth driving mechanism 54 is connected to the second driving mechanism 51, and rotates with the vertical direction of the bridge as the axis under the drive of the second driving mechanism 51; the second guide plate 55 is connected to the fourth driving mechanism 54, and rotates with the longitudinal direction of the bridge as the axis under the drive of the fourth driving mechanism 54. The second guide plate 55 can provide a larger vertical force supplement and is more convenient for angle control. When the transverse guide unit 5 is not activated, the board surface of the first guide plate 52 can be parallel to the transverse direction of the bridge or to the transverse direction and longitudinal direction of the bridge at the same time, and the board surface of the second guide plate 55 is parallel to the transverse direction and longitudinal direction of the bridge at the same time, so as to avoid the wind from passing through the lower side of the bridge. Force acts on the first guide plate 52 and the second guide plate 55.

[0062] Specifically, in this embodiment, the fourth driving mechanism 54 is also a combination of a power source (such as a fourth motor 541) and a rotating shaft (such as a fourth rotating shaft 542) connected by a gear or a belt. The fourth rotating shaft 542 is arranged along the longitudinal direction of the bridge, that is, its axis is parallel to the longitudinal direction of the bridge. At this time, the fourth rotating shaft 542 is perpendicular to the second rotating shaft 512 and the third rotating shaft 532 at the same time. One side of the second deflector 55 is fixedly connected to the fourth rotating shaft 542. Driven by the fourth motor 541, the second deflector 55 rotates with the longitudinal direction of the bridge as the axis. Driven by the second motor 511, the second deflector 55 and the fourth rotating shaft 542 rotate with the vertical direction of the bridge as the axis. When activated, the first deflector 52 is rotated by the second driving mechanism 51 to offset the horizontal force brought by the wind load; the second deflector 55 is rotated by the fourth driving mechanism 54 to provide a certain vertical force for the bridge. Furthermore, the second guide plate 54 and the fourth rotating shaft 542 may also be symmetrically arranged on both sides of the second rotating shaft 512, so that the forces on both sides of the second rotating shaft 512 are uniform.

[0063] It can be understood that in other embodiments, the fourth driving mechanism 54 and the second guide plate 55 may not be connected to the second driving mechanism 51, and another driving mechanism with the same structure and function as the second driving mechanism 51 is provided to act on the fourth driving mechanism 54 and the second guide plate 55 separately to avoid interference between the second guide plate 55 and the first guide plate 52.

[0064] Further, such as Figure 1 As shown, it also includes a plurality of second stress detection units 6, which are distributed on the bridge main beam 100 and are used to detect the stress on the bridge main beam 100, mainly the stress magnitude in the longitudinal direction of the bridge (including tension or pressure); the second stress detection unit 6 is connected to the logic control unit, and the logic control unit controls the rotation angle of the lateral guide unit 5 according to the stress value detected by the second stress detection unit 6.

[0065] Specifically, the second stress can be a stress sensor, etc. The second stress detection unit 6 transmits the detected stress value of the bridge main beam 100 to the logic control unit. In the logic control unit, corresponding control parameters are set corresponding to specific stress values. When the received stress value reaches a preset value, the logic control unit outputs a corresponding control signal to the lateral guide unit 5 according to the corresponding control parameter, and controls the rotation direction and rotation angle of the lateral guide unit 5, so that the wind load impacts the lateral guide unit 5, providing a certain horizontal force and / or vertical force for the bridge, controlling the tension and strain of each component of the bridge, and improving the safety and life of the bridge.

[0066] Preferably, Figure 1As shown, with the distance between every two bridge towers 200 as a setting section, the second stress detection unit 6 can be respectively set at one quarter, one half and three quarters of the setting section to perform horizontal segmented measurement on the stress on the bridge main beam 100 to obtain accurate measurement results, so as to perform overall or segmented control on the lateral guide unit 5.

[0067] Further, such as Figure 1 As shown, when the bridge is a suspension bridge, it also includes a plurality of first stress detection units 3, which are distributed on the bridge hanger 400, preferably in the middle position of the bridge hanger 400, and are used to detect the tension exerted on the bridge hanger 400; the first stress detection unit 3 is connected to the logic control unit, and the logic control unit controls the rotation angle of the nozzle unit 1 according to the tension detected by the first stress detection unit 3.

[0068] The first stress detection unit 3 detects the tension exerted on the bridge hanger 400, and after comparing it with the calculation models of various working conditions of the bridge through the logic control unit, the logic control unit adjusts the rotation angle of the wind nozzle unit 1 according to the measured wind force comparison difference and the actual wind speed based on the wind force detection unit 1, so as to control the tension and strain exerted on the bridge hanger 400 through natural wind, thereby improving the safety and service life of the bridge.

[0069] Specifically, the first stress detection unit 3 can be a stress sensor, a bridge cable stress detection device, etc. The first stress detection unit 3 transmits the detected tension value borne by the bridge hanger 400 to the logic control unit. In the logic control unit, corresponding control parameters are set corresponding to specific tension values. When the received tension value reaches a preset value, the logic control unit outputs a corresponding control signal to the wind nozzle unit 1 according to the corresponding control parameter, and controls the rotation direction and rotation angle of the wind nozzle unit 1, so that the wind load impacts the wind nozzle unit 1, providing a certain vertical force for the bridge, reducing the load borne by the bridge hanger 400, and improving the safety factor of the bridge.

[0070] It can be understood that the logic control unit can make a comprehensive judgment on the stress condition of the bridge based on the wind speed data provided by the wind detection unit 2 and the tension value provided by the first stress detection unit 3. When the wind speed is too small and the wind nozzle unit 1 cannot provide sufficient vertical force to relieve the load on the bridge, an alarm signal is sent out by connecting to an alarm unit to evacuate vehicles on the bridge in time and restrict subsequent vehicles from entering the bridge.

[0071] Preferably, Figure 1As shown, with the distance between every two bridge towers 200 as a setting section, the first stress detection unit 3 can be respectively set at one quarter, one half and three quarters of the setting section, to perform horizontal segmented measurement of the tension exerted on the bridge hanger 400, to obtain accurate measurement results, so as to perform overall or segmented control on the wind nozzle unit 1.

[0072] It is also understandable that, when there is no wind force detection unit 2, the nozzle unit 1, the logic control unit and the first stress detection unit 3 can still work in cooperation with each other, and the tension value borne by the bridge hanger 400 is detected by the first stress detection unit 3 and input into the logic control unit to judge the bridge load condition, and then the vertical force is provided to the bridge by adjusting the rotation angle of the nozzle unit 1 to relieve the load borne by the bridge. When the lateral guide unit 5 and the second stress detection unit 6 are provided, the lateral guide unit 5 can also be used in cooperation with the two to supplement a certain horizontal force and / or vertical force for the bridge, so as to achieve the purpose of improving the safety and life of the bridge.

[0073] Further, such as Figure 1 As shown, it also includes a displacement detection unit 4, which is arranged on the upper part of the bridge tower 200, preferably on the top of the bridge tower 200, and is used to detect the longitudinal displacement of the bridge on the upper part of the bridge tower 200; the displacement detection unit 4 is connected to the logic control unit, and the logic control unit controls the rotation angle of the wind nozzle unit 1 according to the longitudinal displacement of the bridge on the upper part of the bridge tower 200 detected by the displacement detection unit 4.

[0074] Specifically, the displacement detection unit 4 can be a bridge displacement sensor, a laser displacement sensor, etc. When the bridge load is too large, the bridge tower 200 will generate a bending moment, and the upper part of the bridge tower 200, specifically the top of the bridge tower 200, will shift toward the middle of the bridge. The displacement detection unit 4 transmits the detected longitudinal displacement of the upper part of the bridge tower 200 to the logic control unit; in the logic control unit, corresponding control parameters are set corresponding to the specific longitudinal displacement of the bridge. When the received longitudinal displacement of the bridge reaches a preset value, the logic control unit outputs a corresponding control signal to the wind nozzle unit 1 according to the corresponding control parameter, and controls the rotation direction and rotation angle of the wind nozzle unit 1, so that the wind load impacts the wind nozzle unit 1, provides a certain vertical force for the bridge, reduces the load borne by the bridge, and improves the safety factor of the bridge.

[0075] It can be understood that the logic control unit can make a comprehensive judgment on the stress condition of the bridge based on the wind speed data provided by the wind force detection unit 2 and the longitudinal displacement of the bridge provided by the displacement detection unit 4. When the wind speed is too small and the wind nozzle unit 1 cannot provide sufficient vertical force to relieve the load on the bridge, an alarm signal is sent out by connecting to an alarm unit to evacuate vehicles on the bridge in time and restrict subsequent vehicles from entering the bridge.

[0076] It is also understandable that, when there is no wind force detection unit 2, the wind nozzle unit 1, the logic control unit and the displacement detection unit 4 can still work in cooperation with each other, and the longitudinal displacement of the bridge on the bridge tower 200 is detected by the displacement detection unit 4 and input into the logic control unit to judge the bridge load condition, and then the vertical force is provided to the bridge by adjusting the rotation angle of the wind nozzle unit 1 to relieve the load on the bridge. When the lateral guide unit 5 and the second stress detection unit 6 are provided, the lateral guide unit 5 can also be used in cooperation with the two to supplement a certain horizontal force and / or vertical force for the bridge, so as to achieve the purpose of improving the safety and life of the bridge.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bridge stress control system for suppressing vortex vibration, characterized in that: It includes a logic control unit, a plurality of wind nozzle units and a plurality of wind force detection units; The nozzle units are arranged in parallel on both sides of the bridge main beam along the longitudinal direction of the bridge and connected to the bridge main beam, and the connection ends of the nozzle units with the bridge main beam rotate around the longitudinal direction of the bridge as the axis; The wind force detection units are distributed at the upper and lower parts of the bridge and are used to detect wind direction and wind speed; The wind nozzle unit and the wind force detection unit are respectively connected to the logic control unit, and the logic control unit controls the rotation angle of the wind nozzle unit according to the wind speed of the upper and lower parts of the bridge detected by the wind force detection unit; The wind nozzle unit includes an active plate, a driven plate and a first driving mechanism. The active plate is connected to the first driving mechanism and rotates around the longitudinal direction of the bridge under the drive of the first driving mechanism. The active plate is streamlined, and its end away from the main beam of the bridge is acute-angled, so that the airflow can flow along the active plate to the upper and lower sides of the main beam of the bridge. The driven plate is arranged on the upper and lower sides of the active plate, one end of which is movably connected to the main beam of the bridge, and the other end of the driven plate is covered on the active plate and can slide along the active plate.

2. The bridge stress control system for suppressing vortex vibration according to claim 1, characterized in that: When the bridge is a suspension bridge, it also includes a plurality of first stress detection units, which are distributed on the bridge hangers and are used to detect the tension exerted on the bridge hangers; The first stress detection unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the nozzle unit according to the tension detected by the first stress detection unit.

3. The bridge stress control system for suppressing vortex vibration according to claim 1, characterized in that: It also includes a displacement detection unit, which is arranged on the upper part of the bridge tower and is used to detect the longitudinal displacement of the bridge on the upper part of the bridge tower; The displacement detection unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the nozzle unit according to the longitudinal displacement of the bridge on the bridge tower detected by the displacement detection unit.

4. A bridge stress control system for suppressing vortex vibration, wherein the bridge is a suspension bridge, characterized in that: It includes a logic control unit, a plurality of air nozzle units and a plurality of first stress detection units; The nozzle units are arranged in parallel on both sides of the bridge main beam along the longitudinal direction of the bridge and connected to the bridge main beam, and the connection ends of the nozzle units with the bridge main beam rotate around the longitudinal direction of the bridge as the axis; The first stress detection unit is distributed on the bridge hanger and is used to detect the tension exerted on the bridge hanger; The nozzle unit and the first stress detection unit are respectively connected to the logic control unit, and the logic control unit controls the rotation angle of the nozzle unit according to the tension detected by the first stress detection unit; The wind nozzle unit includes an active plate, a driven plate and a first driving mechanism. The active plate is connected to the first driving mechanism and rotates around the longitudinal direction of the bridge under the drive of the first driving mechanism. The active plate is streamlined, and its end away from the main beam of the bridge is acute-angled, so that the airflow can flow along the active plate to the upper and lower sides of the main beam of the bridge. The driven plate is arranged on the upper and lower sides of the active plate, one end of which is movably connected to the main beam of the bridge, and the other end of the driven plate is covered on the active plate and can slide along the active plate.

5. A bridge stress control system for suppressing vortex vibration, characterized in that: It includes a logic control unit, a displacement detection unit and a plurality of nozzle units; The nozzle units are arranged in parallel on both sides of the bridge main beam along the longitudinal direction of the bridge and connected to the bridge main beam, and the connection ends of the nozzle units with the bridge main beam rotate around the longitudinal direction of the bridge as the axis; The displacement detection unit is arranged on the upper part of the bridge tower, and is used to detect the longitudinal displacement of the bridge on the upper part of the bridge tower; The nozzle unit and the displacement detection unit are respectively connected to the logic control unit, and the logic control unit controls the rotation angle of the nozzle unit according to the longitudinal displacement of the bridge on the bridge tower detected by the displacement detection unit; The wind nozzle unit includes an active plate, a driven plate and a first driving mechanism. The active plate is connected to the first driving mechanism and rotates around the longitudinal direction of the bridge under the drive of the first driving mechanism. The active plate is streamlined, and its end away from the main beam of the bridge is acute-angled, so that the airflow can flow along the active plate to the upper and lower sides of the main beam of the bridge. The driven plate is arranged on the upper and lower sides of the active plate, one end of which is movably connected to the main beam of the bridge, and the other end of the driven plate is covered on the active plate and can slide along the active plate.

6. The bridge stress control system for suppressing vortex vibration according to any one of claims 1 to 5, characterized in that: It also includes a plurality of transverse flow guiding units, which are arranged at intervals on both sides of the bridge main beam along the longitudinal direction of the bridge to offset the horizontal force caused by wind load; The transverse guide unit includes a second driving mechanism and a first guide plate, wherein the first guide plate is connected to the second driving mechanism and rotates with the vertical direction of the bridge as the axis under the drive of the second driving mechanism; The lateral air guide unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the lateral air guide unit according to the wind speed detected by the wind force detection unit.

7. The bridge stress control system for suppressing vortex vibration according to claim 6, characterized in that: The lateral guide unit also includes a third driving mechanism, which is connected to the second driving mechanism and rotates around the vertical direction of the bridge under the drive of the second driving mechanism; the first guide plate is connected to the third driving mechanism and rotates around the transverse direction of the bridge under the drive of the third driving mechanism.

8. The bridge stress control system for suppressing vortex vibration according to claim 7, characterized in that: The lateral guide unit also includes a fourth driving mechanism and a second guide plate. The fourth driving mechanism is connected to the second driving mechanism, and rotates around the vertical direction of the bridge under the drive of the second driving mechanism; the second guide plate is connected to the fourth driving mechanism, and rotates around the longitudinal direction of the bridge under the drive of the fourth driving mechanism.

9. The bridge stress control system for suppressing vortex vibration according to claim 6, characterized in that: It also includes a plurality of second stress detection units, which are distributed on the bridge main beam and are used to detect the stress on the bridge main beam; The second stress detection unit is connected to the logic control unit, and the logic control unit controls the rotation angle of the lateral guide unit according to the stress detected by the second stress detection unit.

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