Suspension bridge cable external damping device

Abstract

The application discloses a suspension bridge sling external damping device, and relates to the technical field of damping vibration reduction devices.The device comprises a force transmission lever arranged at intervals with a sling; a force transmission rod assembly, which comprises: a lower force transmission rod assembly, one end of which is connected with the bottom of the sling, and the other end is rotationally connected with the middle part of the force transmission lever, thereby dividing the force transmission lever into a resistance arm and a power arm; an upper force transmission rod assembly, one end of which is connected with the sling, and the other end is rotationally connected with the end part of the resistance arm; and a damping structure arranged at the end part of the power arm and used for being fixed on a main beam. When the device is used, the middle part rotation point of the force transmission lever is taken as a fulcrum, the force transmission lever is divided into the resistance arm and the power arm, the other end of the upper force transmission rod assembly is rotationally connected with the end part of the resistance arm, the damping structure is connected with the end part of the power arm, vibration is amplified and transmitted to the damping structure, and the device has the characteristics of not needing to arrange a special vertical support foundation and being convenient to install.

Description

Technical Field

[0001] This invention relates to the field of damping and vibration reduction device technology, specifically to an external damping device for suspension bridge cables. Background Technology

[0002] With the construction of long-span suspension bridges, the characteristics of thin and long cables, low damping, and multiple vibration modes have become increasingly apparent. Under external wind loads and traffic loads, these cables are prone to various forms of vibration, such as vortex-induced vibration, galloping vibration, buffeting vibration, and parametric vibration. Continuous cable vibration can cause fatigue cracking of the PE sheath and fatigue failure of the waterproof sealing components at the anchor ends, allowing rainwater and humid air to enter the cable body, anchor heads, and auxiliary components. This can lead to corrosion and breakage of the steel wires, and corrosion fatigue failure of the anchor heads and auxiliary components. Accidents involving cable fatigue failure or even breakage occur frequently both domestically and internationally, with cable replacement costs reaching tens of millions of yuan. Furthermore, continuous cable vibration can cause discomfort and insecurity for pedestrians, affecting the normal operation of the bridge. Therefore, effective measures should be taken to control it.

[0003] Modern long-span suspension bridges often employ double or multiple vertically parallel suspension cables, resulting in more complex and diverse vibrations compared to single-cable bridges. From a mode shape perspective, there are modes of relative motion between cables as well as modes of synchronous motion. From a frequency perspective, depending on the external excitation, the cables may experience combined vibrations at multiple frequencies. Referencing vibration reduction methods for suspension cables in numerous long-span suspension bridges both domestically and internationally, none have fundamentally solved the problem of large-amplitude cable vibrations. The main technical challenges are the wide range of cable vibration frequencies and the need to simultaneously meet the requirements for in-phase and out-of-phase, in-plane and out-of-plane vibration control for multiple cables. Therefore, there is an urgent need to develop a cable vibration reduction technology that is highly adaptable, covers a wider frequency range, provides excellent vibration reduction effects, is easy to install and maintain, and has minimal impact on the bridge's aesthetics.

[0004] Traditional cable-stayed external dampers are based on cable-stayed vibration reduction technology. Unlike cable-stayed external dampers, which can be directly supported on the main beam, they usually require a special vertical support foundation. In order to obtain better vibration reduction effect, higher requirements are placed on the installation height and support stiffness. This results in the problem that the damper is inconvenient to install and requires the installation of a special support foundation. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an external damping device for suspension bridge cables, which can solve the problems of inconvenient installation of dampers and the need for special support foundations in the existing technology.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An external damping device for suspension bridge cables is provided, comprising:

[0008] A force-transmitting lever, which is used to be spaced apart from the sling;

[0009] The force transmission rod assembly includes:

[0010] - The lower force transmission rod assembly has one end for connection to the bottom of the sling and the other end for rotatable connection to the middle of the force transmission lever, dividing the force transmission lever into a resistance arm and a power arm;

[0011] - An uploading lever assembly, one end of which is used to connect to the sling and the other end of which is rotatably connected to the end of the resistance arm;

[0012] A damping structure is provided at the end of the power arm for fixing to the main beam.

[0013] Based on the above technical solutions,

[0014] In some alternative embodiments, the lower force transmission rod assembly includes two bottom force transmission rods, one end of which is respectively used to connect to the bottom of the two parallel slings, and the other end is inclined upward and rotatably connected to the middle of the force transmission lever.

[0015] In some alternative embodiments, the force transmission rod assembly includes two upper force transmission rods, one end of which is respectively used to connect to the two parallel slings, and the other end is inclined downward and rotatably connected to the end of the resistance arm.

[0016] In some alternative designs, the end of the power arm is provided with an inertial mass structure.

[0017] In some alternative embodiments, the damping structure includes:

[0018] A damping container, which is installed on the main beam, is used to hold viscous materials;

[0019] A damping insert is disposed at the end of the power arm, the damping insert being partially located within the viscous material.

[0020] In some alternative embodiments, the inertial mass structure is an opening-down sleeve structure that covers the outside of the damping container.

[0021] In some alternative embodiments, the damping insert includes:

[0022] At least one force transmission column, the upper end of which is connected to the end of the power arm;

[0023] At least one insert plate is connected to the lower end of the force transmission column and is located within the viscous material. The outer diameter of the insert plate is smaller than the inner diameter of the damping container.

[0024] In some alternative solutions, the insert plate is a circular insert plate, and four force transmission columns are evenly spaced on the upper side of the circular insert plate.

[0025] In some alternative designs, the insert plate is perpendicular to the sling, and the insert plate has a through hole along the axial direction of the force transmission column.

[0026] In some alternative designs, the force transmission column is detachably connected to the end of the power arm.

[0027] Compared with the prior art, the advantages of the present invention are as follows:

[0028] When using this external damping device for suspension bridge cables, the force transmission levers are spaced apart from the cables. One end of the lower force transmission rod assembly is connected to the bottom of the cable, and the other end is rotatably connected to the middle of the force transmission lever. One end of the upper force transmission rod assembly is connected to the cable, and the other end is rotatably connected to the end of the resistance arm. The damping structure is set on the main beam and connected to the end of the power arm. By directly connecting one end of the lower force transmission rod assembly to the bottom of the cable, taking advantage of the almost zero displacement at the bottom of the cable, the rotation point in the middle of the force transmission lever can be used as the fulcrum of the amplifying lever, dividing the force transmission lever into a resistance arm and a power arm. Then, one end of the upper force transmission rod assembly is connected to the cable, and the other end is rotatably connected to the end of the resistance arm. The damping structure is connected to the end of the power arm. After amplifying the vibration, the damping structure works to achieve the damping effect. It has the advantages of not requiring a special vertical support foundation and being easy to install, solving the problem of inconvenient installation of dampers and the need for a special support foundation in existing technologies. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a side view schematic diagram of an embodiment of an external damping device for suspension bridge cables according to the present invention;

[0031] Figure 2 This is a schematic diagram of an embodiment of an external damping device for suspension bridge cables according to the present invention;

[0032] Figure 3 This is a front view schematic diagram of an embodiment of an external damping device for suspension bridge cables according to the present invention;

[0033] Figure 4 This is a schematic diagram of the force transmission lever in an embodiment of an external damping device for suspension bridge cables according to the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of a single-layer insert plate in an embodiment of an external damping device for suspension bridge cables according to the present invention;

[0035] Figure 6 This is a schematic diagram of the hollow insert plate in an embodiment of an external damping device for suspension bridge cables according to the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of a double-layer insert plate in an embodiment of an external damping device for suspension bridge cables according to the present invention;

[0037] Figure 8 This is a schematic diagram of the damping container in an embodiment of an external damping device for suspension bridge cables according to the present invention.

[0038] In the diagram: 1. Force transmission lever; 11. Resistance arm; 12. Power arm; 13. First ball joint; 14. Second ball joint; 2. Force transmission rod assembly; 21. Upper force transmission rod assembly; 211. Upper force transmission rod; 22. Lower force transmission rod assembly; 221. Bottom force transmission rod; 3. Suspension cable; 4. Main beam; 5. Inertial mass structure; 6. Damping structure; 61. Damping insert plate; 611. Force transmission column; 612. Insert plate; 62. Damping container. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The following detailed description, in conjunction with the accompanying drawings, provides an embodiment of an external damping device for suspension bridge cables according to the present invention.

[0041] like Figure 1 and Figure 4 As shown, an external damping device for suspension bridge cables includes:

[0042] Force transmission lever 1 is used to be spaced apart from sling 3;

[0043] Force transmission rod assembly 2, which includes:

[0044] - The lower force transmission rod assembly 22 has one end for connection to the bottom of the sling 3 and the other end for rotatable connection to the middle of the force transmission lever 1, dividing the force transmission lever 1 into a resistance arm 11 and a power arm 12.

[0045] -Upload lever assembly 21, one end of which is used to connect to sling 3, and the other end is rotatably connected to the end of resistance arm 11;

[0046] The damping structure 6 is located at the end of the power arm 12 and is used to fix it to the main beam 4.

[0047] When using the external damping device for the suspension bridge cable, the force transmission lever 1 and the cable 3 are spaced apart. One end of the lower force transmission rod assembly 22 is connected to the bottom of the cable 3, and the other end is rotatably connected to the middle of the force transmission lever 1. One end of the upper force transmission rod assembly 21 is connected to the cable 3, and the other end is rotatably connected to the end of the resistance arm 11. The damping structure 6 is set on the main beam 4 and connected to the end of the power arm 12. By directly connecting one end of the lower force transmission rod assembly 22 to the bottom of the sling 3, and taking advantage of the fact that the displacement of the bottom of the sling 3 is very small and almost zero, the rotation point in the middle of the force transmission lever 1 can be used as the fulcrum of the amplifying lever. The force transmission lever 1 is divided into a resistance arm 11 and a power arm 12. Then, one end of the upper force transmission rod assembly 21 is connected to the sling 3, and the other end is rotatably connected to the end of the resistance arm 11. The damping structure 6 is connected to the end of the power arm 12. After the vibration is amplified, the damping structure 6 works to achieve the damping effect. It has the advantages of not needing to arrange a special vertical support foundation and being easy to install. It solves the problem of inconvenient installation of dampers and the need to install a special support foundation in the existing technology.

[0048] In this example, the end of the resistance arm 11 is connected to the uploading force rod assembly 21 via the first ball joint 13. The uploading force rod assembly 21 is provided with a hinge seat, and a rotating ball is rotatably provided on the hinge seat. The rotating ball is rotatably connected to the end of the resistance arm 11.

[0049] The rotation point in the middle of the force transmission lever 1 is provided with a second ball joint 14, which divides the force transmission lever 1 into a resistance arm 11 and a power arm 12. The lower force transmission rod assembly 22 is rotatably connected to the second ball joint 14.

[0050] like Figure 2 and Figure 3 As shown, in some optional embodiments, the lower force transmission rod assembly 22 includes two bottom force transmission rods 221. One end of each bottom force transmission rod 221 is used to connect to the bottom of two parallel slings 3, and the other end is inclined upward and rotatably connected to the middle of the force transmission lever 1.

[0051] In this embodiment, taking advantage of the fact that the bottom displacement of the sling 3 is very small and almost zero, one end of each of the two bottom force transmission rods 221 is fixedly connected to the bottom of the two parallel slings 3, and the other end is tilted upward and rotatedly connected to the middle of the force transmission lever 1. This can shorten the resistance arm 11 while lengthening the power arm 12, thereby obtaining a larger lever amplification factor.

[0052] like Figure 3As shown, in some optional embodiments, the upper force transmission rod assembly 21 includes two upper force transmission rods 211, one end of which is used to connect to two parallel slings 3 respectively, and the other end is inclined downward and rotatably connected to the end of the resistance arm 11.

[0053] In this embodiment, taking advantage of the larger vibration displacement at the upper end of the sling 3, one end of each of the two upper force transmission rods 211 is connected to the two parallel slings 3, and the other end is tilted downward and rotatably connected to the end of the resistance arm 11. This can achieve a larger vibration displacement and reduce the installation height of the damper.

[0054] like Figure 4 As shown, in some optional embodiments, the end of the power arm 12 is provided with an inertial mass structure 5.

[0055] In this embodiment, an inertial mass structure 5 is provided at the end of the power arm 12, which can provide inertial force at the lower end of the force transmission lever 1 to enhance the effect of the lever mass damping device.

[0056] like Figure 5 and Figure 8 As shown, in some optional embodiments, the damping structure 6 includes:

[0057] Damping container 62, which is installed on the main beam 4, is used to hold viscous materials;

[0058] A damping insert 61 is provided at the end of the power arm 12, and part of the damping insert 61 is located within the viscous material.

[0059] In this embodiment, the damping structure 6 includes a damping container 62 and a damping insert 61. The damping container 62 is disposed on the main beam 4 and contains a viscous material. The damping insert 61 is connected to the end of the power arm 12, and part of the damping insert 61 is located inside the viscous material to achieve shearing of the viscous material when the sling 3 vibrates. The structure is simple and easy to install.

[0060] like Figure 4 and Figure 5 As shown, in some optional embodiments, the inertial mass structure 5 is a sleeve structure with an opening facing downwards, and the sleeve structure covers the outside of the damping container 62.

[0061] In this embodiment, the inertial mass structure 5 is set as a sleeve structure with the opening facing downward. The sleeve structure covers the outside of the damping container 62. The sleeve structure can provide a certain degree of protection for the damping structure 6, preventing foreign objects from falling into the sticky material inside the damping container 62. In addition, there is a certain gap between the sleeve structure and the damping container 62 to prevent the sleeve structure from colliding with the damping container 62 when the power arm 12 vibrates.

[0062] like Figure 5 and Figure 7 As shown, in some optional embodiments, the damping insert 61 includes:

[0063] At least one force transmission column 611, the upper end of which is connected to the end of the power arm 12;

[0064] At least one insert plate 612 is connected to the lower end of the force transmission column 611 and is located in the viscous material. The outer diameter of the insert plate 612 is smaller than the inner diameter of the damping container 62.

[0065] In this embodiment, the damping insert 61 includes at least one force transmission column 611 and at least one insert plate 612. The upper end of the force transmission column 611 is connected to the end of the power arm 12, and the insert plate 612 is connected to the lower end of the force transmission column 611. Located in the viscous material, it can achieve better damping effect and ensure that when the vibration displacement of the sling 3 is amplified and transmitted to the damping structure 6, the insert plate 612 and the damping container 62 do not collide.

[0066] like Figure 5 and Figure 7 As shown, in some optional embodiments, the insert plate 612 is a circular insert plate, and four force transmission columns 611 are evenly spaced on the upper side of the circular insert plate.

[0067] In this embodiment, the insert plate 612 is a circular insert plate, and four force transmission columns 611 are evenly spaced on the upper side of the circular insert plate. This can make the connection between the insert plate 612 and the bottom of the thickened sleeve better, and the structure of the damping insert plate 61 is more stable, which can achieve better shearing action.

[0068] like Figure 6 As shown, in some optional embodiments, the insert plate 612 is perpendicular to the sling 3, and the insert plate 612 has a through hole along the axial direction of the force transmission column 611.

[0069] In this embodiment, the plane of the insert plate 612 is perpendicular to the axis of the sling 3. The insert plate 612 is provided with a through hole along the axial direction of the force transmission column 611, which can transmit the horizontal vibration of the sling 3 to the damper, thereby dissipating the vibration energy. The damping effect is improved by increasing the contact area between the insert plate 612 and the adhesive material in the horizontal direction.

[0070] In some alternative embodiments, the force transmission column 611 is detachably connected to the end of the power arm 12.

[0071] In this embodiment, the force transmission column 611 is detachably connected to the end of the power arm 12. The damping plate 61 can be replaced as needed to change the damping coefficient of the damping structure 6. The damping plate 61 can also be easily replaced when it is damaged.

[0072] In summary, when using this external damping device for suspension bridge cables, the force transmission lever 1 and the cable 3 are spaced apart. One end of each of the two bottom force transmission rods 221 is connected to the bottom of the two parallel cables 3, and the other end is tilted upward and rotatably connected to the middle of the force transmission lever 1. This can shorten the resistance arm 11 while lengthening the power arm 12, thus obtaining a larger lever amplification factor. One end of each of the two upper force transmission rods 211 is connected to the two parallel cables 3, and the other end is tilted downward and rotatably connected to the end of the resistance arm 11. This can obtain a larger vibration displacement and reduce the installation height of the damper. The damping container 62 is set on the main beam 4, and the damping insert 61 is connected to the end of the power arm 12. By directly connecting one end of the lower force transmission rod assembly 22 to the bottom of the sling 3, and taking advantage of the fact that the displacement of the bottom of the sling 3 is very small and almost zero, the rotation point in the middle of the force transmission lever 1 can be used as the fulcrum of the amplifying lever. The force transmission lever 1 is divided into a resistance arm 11 and a power arm 12. Then, one end of the upper force transmission rod assembly 21 is connected to the sling 3, and the other end is rotatably connected to the end of the resistance arm 11. The damping structure 6 is connected to the end of the power arm 12. After the vibration is amplified, the damping structure 6 works to achieve the damping effect. It has the advantages of not needing to arrange a special vertical support foundation and being easy to install. It solves the problem of inconvenient installation of dampers and the need to install a special support foundation in the existing technology.

[0073] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0074] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0075] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An external damping device for suspension bridge cables, characterized in that, include: A force transmission lever (1) is used to be spaced apart from the sling (3); The force transmission rod assembly (2) includes: - The lower force transmission rod assembly (22) has one end for connecting to the bottom of the sling (3) and the other end for rotatably connecting to the middle of the force transmission lever (1), dividing the force transmission lever (1) into a resistance arm (11) and a power arm (12), with the resistance arm (11) located above the power arm (12). -Upload lever assembly (21), one end of which is used to connect to the sling (3), and the other end is rotatably connected to the end of the resistance arm (11); A damping structure (6) is provided at the end of the power arm (12) for fixing to the main beam (4); The lower force transmission rod assembly (22) includes two bottom force transmission rods (221). One end of each of the two bottom force transmission rods (221) is used to connect to the bottom of the two parallel slings (3), and the other end is inclined upward and rotatably connected to the middle of the force transmission lever (1). The upper force rod assembly (21) includes two upper force rods (211). One end of each of the two upper force rods (211) is used to connect to the two parallel slings (3), and the other end is tilted downward and rotatably connected to the end of the resistance arm (11).

2. The external damping device for suspension bridge cables as described in claim 1, characterized in that, The end of the power arm (12) is provided with an inertial mass structure (5).

3. The external damping device for suspension bridge cables as described in claim 2, characterized in that, The damping structure (6) includes: A damping container (62) is provided on the main beam (4) for holding viscous materials; A damping insert (61) is disposed at the end of the power arm (12), the damping insert (61) being partially located within the viscous material.

4. The external damping device for suspension bridge cables as described in claim 3, characterized in that, The inertial mass structure (5) is a sleeve structure with an opening facing downwards, and the sleeve structure is placed on the outside of the damping container (62).

5. The external damping device for suspension bridge cables as described in claim 3, characterized in that, The damping insert (61) includes: At least one force transmission column (611) has its upper end connected to the end of the power arm (12); At least one insert plate (612) is connected to the lower end of the force transmission column (611) and located within the viscous material. The outer diameter of the insert plate (612) is smaller than the inner diameter of the damping container (62).

6. The external damping device for suspension bridge cables as described in claim 5, characterized in that, The insert plate (612) is a circular insert plate, and four force transmission columns (611) are evenly spaced on the upper side of the circular insert plate.

7. The external damping device for suspension bridge cables as described in claim 6, characterized in that, The insert plate (612) is perpendicular to the sling (3), and the insert plate (612) has a through hole along the axial direction of the force transmission column (611).

8. The external damping device for suspension bridge cables as described in claim 5, characterized in that, The force transmission column (611) is detachably connected to the end of the power arm (12).

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