Separated type steel box girder vortex-induced resonance suppression device

Abstract

The utility model relates to a device for suppressing vortex-induced resonance of separated steel box girders, which is mounted between two adjacent separated steel box girders and comprises a piston damper, and a first piston rod and a second piston rod which respectively extend out of two ends of the piston damper and are positioned on the same straight line, the first piston rod is rotatably connected to one separated steel box girder through a first base, the second piston rod is rotatably connected to the other separated steel box girder through a second base, and the straight line where the first piston rod and the second piston rod are located is obliquely arranged relative to the end faces of the two separated steel box girders. Compared with the prior art, the steel box girder has the advantages of being convenient for follow-up maintenance work, large in damping ratio, capable of increasing rigidity of the steel box girder, small in additional load on the steel box girder, lower in material cost, wide in arrangement position and the like.

Description

Technical Field

[0001] The utility model relates to the field of steel box girder suppression structures, in particular to a device for suppressing vortex-induced resonance of a separated steel box girder. Background Art

[0002] Under the action of wind load, the vibration generated by the bridge structure can easily cause fatigue damage to the structure or components, and cause pedestrians or vehicles to feel unsafe or uncomfortable, or even completely destroy the bridge structure or components. The separated steel box girder is a main beam form of the bridge. Compared with the concrete beam, it is lighter and more delicate, and is more likely to vibrate under wind load. Especially in the case of lateral wind, the steel box girder located downstream of the incoming wind will experience large amplitude vortex-induced vibration, affecting the normal use of the bridge. Certain measures must be taken to effectively control it.

[0003] Generally, mechanical damping, such as tuned mass dampers and tuned liquid dampers, installed inside steel box girders can effectively control the vibration of steel box girders. However, installing dampers inside steel box girders requires a large mass device to provide sufficient damping, which increases the additional load of the steel box girder, and is not convenient for the maintenance of the dampers. Utility Model Content

[0004] The purpose of the utility model is to provide a device for suppressing vortex-induced resonance of a separated steel box girder in order to overcome the defects of the above-mentioned prior art that, on the one hand, a device with larger mass is required to provide sufficient damping, which increases the additional load of the steel box girder, and on the other hand, it is inconvenient to maintain the damper.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A device for suppressing vortex-induced resonance of a separated steel box beam is installed between two adjacent separated steel box beams. The device includes a piston damper, a first piston rod and a second piston rod extending from both ends of the piston damper and located on the same straight line. The first piston rod is rotatably connected to one separated steel box beam via a first base, and the second piston rod is rotatably connected to the other separated steel box beam via a second base. The straight line where the first piston rod and the second piston rod are located is inclined relative to the end faces of the two separated steel box beams.

[0007] Furthermore, the first base and the second base both include a fixed steel plate, a flange plate and a rotating shaft, the fixed steel plate is a flat plate structure, installed on the end face of the separated steel box girder; the flange plate is installed on the fixed steel plate and is provided with a through hole for fixing the rotating shaft; the rotating shaft is rotatably installed in the through hole of the flange plate, and the first piston rod or the second piston rod is hingedly installed on the rotating shaft.

[0008] Furthermore, the flange plate is also provided with a stiffening plate connected to the fixed steel plate, and the stiffening plates are distributed on both sides of the entire flange plate.

[0009] Furthermore, the stiffening plate is triangular.

[0010] Furthermore, the fixing steel plate is welded to the end surface of the separated steel box girder.

[0011] Furthermore, the flange plate is welded to the fixed steel plate.

[0012] Furthermore, there are multiple suppression devices, the first piston rod of each suppression device is connected to the upper part of a separated steel box girder, and the second piston rod is connected to the lower part of another separated steel box girder; and the suppression devices are arranged crosswise with each other.

[0013] Further, the number of the restraining devices is two, the first piston rod of one restraining device is connected to the upper part of the left separated steel box girder, and the second piston rod is connected to the lower part of the right separated steel box girder;

[0014] A first piston rod of the other restraining device is connected to the lower portion of the left separated steel box girder, and a second piston rod is connected to the upper portion of the right separated steel box girder.

[0015] Furthermore, the piston damping is a liquid damper.

[0016] Furthermore, the angle formed by the straight line where the first piston rod and the second piston rod are located relative to the end faces of the two separated steel box girders is within the range of 20-70 degrees.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] (1) The utility model is directly connected to the end surface between two adjacent separated steel box girders through a piston damper and a piston rod. When the separated steel box girders vibrate, they can be rotated and stretched. The piston damper in the middle converts the up and down movement of the separated steel box girders into heat energy to achieve the purpose of reducing resonance.

[0019] The installation position of the utility model is located outside the steel box girder, which is convenient for subsequent maintenance work; by connecting the steel box girders on the left and right sides, when one of them vibrates, it will inevitably be hindered by the other one, so that the damper has a large damping ratio and increases the rigidity of the steel box girder. A device installed in the middle of the span of the bridge can have a better effect, and the additional load on the steel box girder is small.

[0020] (2) The utility model installs the piston rod on the end face of the separated steel box girder through a simple fixed steel plate structure, which has lower mass and material cost, and can be freely set at the upper and lower ends of the end face of the separated steel box girder, with a wide range of setting positions, and multiple damping devices can be added to improve the vibration reduction capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a device for suppressing vortex-induced resonance of a separated steel box girder provided in an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of a wind resonance suppression state of a device for suppressing vortex-induced resonance of a separated steel box girder provided in an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the base structure of a device for suppressing vortex-induced resonance of a separated steel box girder provided in an embodiment of the utility model;

[0024] In the figure, 1. separated steel box girder, 2. first piston rod, 3. piston damper, 4. rotating shaft, 5. fixed steel plate, 6. flange plate, 7. stiffening plate, 8. second piston rod. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] 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.

[0028] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0029] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment provides a device for suppressing vortex-induced resonance of a separated steel box girder, which is installed between two adjacent separated steel box girders 1. The suppression device includes a piston damper 3, a first piston rod 2 and a second piston rod 8 respectively extending from both ends of the piston damper 3 and located on the same straight line. The first piston rod 2 is rotatably connected to one separated steel box girder 1 through a first base, and the second piston rod 8 is rotatably connected to the other separated steel box girder 1 through a second base. The straight line where the first piston rod 2 and the second piston rod 8 are located is inclined relative to the end faces of the two separated steel box girders 1; preferably, the angle formed by the straight line where the first piston rod 2 and the second piston rod 8 are located relative to the end faces of the two separated steel box girders 1 is within the range of 20-70 degrees.

[0033] The piston damper 3 makes the two piston rods retractable and can move back and forth between the two separated steel box girders 1 .

[0034] The utility model is directly connected to the end surface between two adjacent separated steel box beams 1 through the piston damper 3 and the piston rod. When the separated steel box beam 1 vibrates, it can be rotated and stretched. The up and down movement of the separated steel box beam 1 is converted into heat energy through the middle piston damper 3 to achieve the purpose of reducing resonance.

[0035] In this solution, the piston rod is installed on the end face of the separated steel box girder 1 through a simple fixed steel plate 5 structure, which has lower quality and lower material cost. It can be freely set at the upper and lower ends of the end face of the separated steel box girder 1, and the setting position is wide. Multiple damping devices can be added to improve the vibration reduction capacity.

[0036] The first base and the second base are structures that can be fixed on the side wall of the separated steel box beam 1 and can be rotatably connected to the piston rod. Optionally, Figure 3As shown, in this embodiment, the first base and the second base both include a fixed steel plate 5, a flange plate 6 and a rotating shaft 4. The fixed steel plate 5 is a flat plate structure and is installed on the end surface of the separated steel box girder 1; the flange plate 6 is installed on the fixed steel plate 5 and is provided with a through hole for fixing the rotating shaft 4; the rotating shaft 4 can be rotatably installed in the through hole of the flange plate 6, and the first piston rod 2 or the second piston rod 8 is hingedly installed on the rotating shaft 4.

[0037] Preferably, the flange plate 6 can be reinforced when necessary to prevent yielding caused by local unfavorable force. That is, the flange plate 6 is also provided with a stiffening plate 7 connected to the fixed steel plate 5, and the stiffening plates 7 are distributed on both sides of the flange plate 6 as a whole.

[0038] Specifically, Figure 3 As shown, triangular stiffening plates 7 can be provided on both sides of the flange plate 6 for support, which can restrain the deformation of the flange plate 6 and reduce the stress when necessary.

[0039] In this embodiment, two flange plates 6 are provided on the fixed steel plate 5 to jointly support the rotating shaft 4 , and triangular stiffening plates 7 are provided on the overall outer sides of the two flange plates 6 for auxiliary support.

[0040] The fixed steel plate 5 is welded to the steel box beam 1, and the wing can also be welded to the fixed steel plate 5. The piston damper 3 can be a liquid damper.

[0041] The above-mentioned rotating shaft 4 allows the damping device to rotate in the transverse plane of the steel box girder 1, and limits the displacement of the damping device in the longitudinal plane. When the steel box girder 1 undergoes vortex-induced vibration, it generally produces large displacements in the vertical and transverse directions, and the longitudinal displacement can be basically ignored. Therefore, the above-mentioned fixing method can enable the damping device to play a role when vortex-induced vibration occurs, and the structure will not be damaged due to forced displacement caused by redundant constraints, while the damping device can be fixed more stably.

[0042] The number of the above-mentioned suppression devices can be set to one or more, the first piston rod 2 of each suppression device is connected to the upper part of a separated steel box girder 1, and the second piston rod 8 is connected to the lower part of another separated steel box girder 1; the suppression devices are arranged crosswise with each other.

[0043] If the number of the restraining devices is two, the first piston rod 2 of one restraining device is connected to the upper part of the left separated steel box girder 1, and the second piston rod 8 is connected to the lower part of the right separated steel box girder 1;

[0044] The first piston rod 2 of the other restraining device is connected to the lower part of the left separated steel box girder 1 , and the second piston rod 8 is connected to the upper part of the right separated steel box girder 1 .

[0045] When in use, for a specific bridge, several vortex-induced resonance suppression devices for separated steel box girders provided in this solution can be configured as needed. For a multi-span bridge, one can be arranged in each span, or arranged at the point of maximum vortex-induced vibration amplitude.

[0046] Working principle:

[0047] like Figure 2 As shown, when there is wind coming from the left, the right box girder is easily affected by the left box girder and generates vortex-induced resonance in the vertical direction. When it starts to move up and down, the piston damper 3 connected to the box bodies on both sides starts to play a role, and the purpose of reducing resonance is achieved by converting the kinetic energy of the box girder moving up and down into heat energy in the piston damper 3. At this time, if the right box girder moves upward, the piston damper 3 connected to the upper part of the right box girder is stretched, and the piston damper 3 connected to the lower part of the right box girder is compressed, so that the two piston dampers 3 work together. The principle of the right box girder moving downward is the same.

[0048] But it should be noted that although Figure 2 Only an embodiment in which two piston dampers 3 act simultaneously is shown. When the vortex vibration amplitude is not too large or is restricted by economic conditions, installing only one piston damper 3 on the two side boxes can also achieve a certain suppression effect.

[0049] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A device for suppressing vortex-induced resonance of a separated steel box girder, installed between two adjacent separated steel box girders (1), characterized in that: The suppression device comprises a piston damper (3), a first piston rod (2) and a second piston rod (8) extending from both ends of the piston damper (3) and located on the same straight line, the first piston rod (2) being rotatably connected to a separated steel box beam (1) via a first base, the second piston rod (8) being rotatably connected to another separated steel box beam (1) via a second base, and the straight line where the first piston rod (2) and the second piston rod (8) are located is inclined relative to the end faces of the two separated steel box beams (1); There are multiple suppression devices, the first piston rod (2) of each suppression device is connected to the upper part of a separated steel box girder (1), and the second piston rod (8) is connected to the lower part of another separated steel box girder (1); the suppression devices are arranged crosswise with each other; The angle formed by the straight line where the first piston rod (2) and the second piston rod (8) are located relative to the end faces of the two separated steel box girders (1) is within the range of 20-70 degrees.

2. The device for suppressing vortex-induced resonance of a separated steel box girder according to claim 1, characterized in that: The first base and the second base both comprise a fixed steel plate (5), a flange plate (6) and a rotating shaft (4); the fixed steel plate (5) is a flat plate structure and is mounted on the end face of the separated steel box girder (1); the flange plate (6) is mounted on the fixed steel plate (5) and is provided with a through hole for fixing the rotating shaft (4); the rotating shaft (4) is rotatably mounted in the through hole of the flange plate (6), and the first piston rod (2) or the second piston rod (8) is hingedly mounted on the rotating shaft (4).

3. The device for suppressing vortex-induced resonance of a separated steel box girder according to claim 2, characterized in that: The flange plate (6) is also provided with a stiffening plate (7) connected to and fixed to the steel plate (5), and the stiffening plates (7) are distributed on both sides of the entire flange plate (6).

4. The device for suppressing vortex-induced resonance of a separated steel box girder according to claim 3 is characterized in that: The stiffening plate (7) is triangular in shape.

5. The device for suppressing vortex-induced resonance of a separated steel box girder according to claim 2, characterized in that: The fixing steel plate (5) is welded to the end surface of the separated steel box girder (1).

6. The device for suppressing vortex-induced resonance of a separated steel box girder according to claim 2, characterized in that: The flange plate (6) is welded to the fixed steel plate (5).

7. The device for suppressing vortex-induced resonance of a separated steel box girder according to claim 1, characterized in that: There are two restraining devices, a first piston rod (2) of one restraining device is connected to the upper part of the left separated steel box girder (1), and a second piston rod (8) is connected to the lower part of the right separated steel box girder (1); The first piston rod (2) of the other restraining device is connected to the lower part of the left separated steel box girder (1), and the second piston rod (8) is connected to the upper part of the right separated steel box girder (1).

8. The device for suppressing vortex-induced resonance of a separated steel box girder according to claim 1, characterized in that: The piston damper (3) is a liquid damper.

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