Additional bridge inhaul cable or suspender vibration control device

Abstract

The invention provides an additional bridge inhaul cable or suspender vibration control device, and belongs to the technical field of bridge engineering vibration control. The device comprises an additional vibration control assembly and a limiting adjusting structure. The additional vibration control assembly wraps the outer circumference of the inhaul cable / suspender body and is used for changing the shape of the cross section of the inhaul cable or suspender. The limiting adjusting structure is arranged at one end or two ends of the additional vibration control assembly, is used for limiting the end part of the additional vibration control assembly, and can adjust the enclosing diameter and the enclosing tension of the additional vibration control assembly. The device is suitable for inhaul cable or suspender structures of long-span bridges such as a cable-stayed bridge, a suspension bridge and an arch bridge, and various types of vibration such as wind-induced vibration and load excitation vibration can be effectively restrained; and the adaptability is high, and installation and maintenance are convenient.

Description

Technical Field

[0001] This invention relates to a vibration control device, specifically an additional vibration control device for bridge cables or suspenders, belonging to the field of vibration control technology for bridge engineering. Background Technology

[0002] Cables and suspenders are the core load-bearing components of long-span bridges. Due to their light weight and low damping, they are highly susceptible to harmful vibrations such as vortex-induced resonance, wake galloping, and wind-induced vibration under external forces such as wind and rain excitation, bridge deck traffic loads, and environmental fluctuations. This continuous vibration can lead to fatigue damage at the cable end joints, cracking of the protective sleeve, and accelerated corrosion and aging of the internal steel wires. In severe cases, it can cause cable failure, endangering the structural safety and operational lifespan of the bridge.

[0003] Currently, commonly used cable vibration control devices in engineering mainly fall into two categories: damper-type and pneumatic modification-type. Damper-type devices (such as hydraulic dampers, magnetorheological dampers, and wire rope dampers) dissipate vibration energy by providing additional damping, but they have several drawbacks: hydraulic dampers are prone to oil leakage, have high maintenance costs, and are poorly sensitive to small vibrations; magnetorheological dampers are expensive and require additional energy supply; traditional wire rope dampers often use a circumferential multi-unit arrangement, which is complex to install, has high overall stiffness, and is prone to reducing damping performance. Pneumatic modification-type devices (such as adding ribs or recesses) optimize the airflow field by changing the cable's cross-sectional shape, but the approach involves changing the cross-sectional shape during cable production, resulting in poor structural adaptability, difficulty in meeting the vibration control needs of cables with different diameters, and the modified structure is easily damaged.

[0004] Currently, there is no vibration control device that combines ease of installation, adjustable damping, strong adaptability, and good durability. Especially for the multi-directional vibrations of cables (in-plane, out-of-plane, and axial), existing devices often offer only single-dimensional suppression effects and cannot achieve comprehensive vibration control. Therefore, developing a simple, easy-to-install, and comprehensive vibration reduction device for cables or suspenders has significant practical engineering value. Summary of the Invention

[0005] In view of this, the present invention provides an additional bridge cable or suspender vibration control device, which is applicable to the cable or suspender structure of long-span bridges such as cable-stayed bridges, suspension bridges, and arch bridges. It can effectively suppress various types of vibrations such as wind-induced vibration and load-induced vibration; and it has high adaptability and is easy to install and maintain.

[0006] The technical solution of the present invention is: an additional bridge cable or hanger vibration control device, comprising: an additional vibration control component and a limit adjustment structure; The additional vibration control component is wrapped around the outer circumference of the cable / rod body and is used to change the cross-sectional shape of the cable or rod. The limiting adjustment structure is disposed at one or both ends of the additional vibration control component, for limiting the end of the additional vibration control component, and can adjust the enclosing diameter and enclosing tension of the additional vibration control component.

[0007] As a preferred embodiment of the present invention, the additional vibration control assembly forms axially spaced protrusions on the outer surface of the cable / rod body.

[0008] As a preferred embodiment of the present invention, the additional vibration control component includes: a plurality of micro-bulges spaced axially on the surface of the cable / rod body and a zipper-type vibration damping component covering the plurality of micro-bulges.

[0009] In a preferred embodiment of the present invention, the zipper-type vibration damping component includes two symmetrically arranged flexible zipper strips and damping units distributed on the zipper strips. The two zipper straps are enclosed and covered by an interlocking structure around the slightly bulging portion of the cable / rod body; The inner side of the zipper tape has a slot adapted to the micro-bulge at the micro-bulge position; after the two zipper tapes are closed, the micro-bulge is embedded in the corresponding slot, and the slot is provided with an anti-slip rubber pad.

[0010] In a preferred embodiment of the present invention, the damping unit comprises: a cantilever elastic damping element and a friction damping plate; Several cantilevered elastic damping elements are spaced apart along the axial direction of the cable / rod body on the outside of the zipper tape; one end of each cantilevered elastic damping element is fixedly connected to the outer surface of the zipper tape, and the other end is a free end; The friction damping sheet is disposed between the anti-slip rubber pad and the micro-bulge.

[0011] As a preferred embodiment of the present invention, the micro-bulge is integrally formed with the cable / rod body or is detachably connected.

[0012] In a preferred embodiment of the present invention, the micro-bulge is hemispherical with a diameter of 1 / 5 to 1 / 3 of the diameter of the cable / rod body; the axial distance between adjacent micro-bulges is 2 to 3 times the diameter of the micro-bulge.

[0013] In a preferred embodiment of the present invention, the limiting adjustment structure includes: a connecting ear plate and an adjusting bolt; The ends of the two zipper straps are provided with connecting ear plates facing each other. The adjusting bolt is threaded with the two connecting ear plates. The enclosing diameter and enclosing tension of the two zipper straps can be adjusted by tightening or loosening the adjusting bolt.

[0014] As a preferred embodiment of the present invention, the limiting adjustment structure further includes a tension sensor, which is used to monitor the enclosing tension of the zipper tape in real time.

[0015] In a preferred embodiment of the present invention, the cable or suspender body is fixedly connected to the bridge beam or tower column through an end fixing structure; The end fixing structure includes: a clamp and a bracket. The clamp is sleeved on the end of the cable / suspender body, and the bracket is fixedly connected to the bridge beam or tower column. The clamp and the bracket are connected by an elastic connector.

[0016] Beneficial effects: (1) The present invention uses an additional vibration control component, which is wrapped around the outer circumference of the cable or the rod to change the cross-sectional shape of the cable or the rod, thereby changing the airflow field on the surface of the cable or the rod. Using the additional vibration control component does not require disassembling the cable (or the rod) or damaging the original structure, and the installation and maintenance are convenient.

[0017] (2) The additional vibration control component of the present invention adopts a zipper-type micro-bulge structure. The micro-bulge structure can change the airflow field on the surface of the cable and suppress the generation of wind-induced vibration. The zipper-type vibration damping component can effectively suppress in-plane, out-of-plane and axial multi-directional vibration through the dual energy dissipation of spring damping and friction damping. It has a wide vibration reduction frequency band and is suitable for cables with different vibration frequencies, with a comprehensive vibration reduction effect.

[0018] (3) Convenient installation and maintenance: The zipper-type interlocking structure can be quickly enclosed and fixed to the outside of the cable or the rod without disassembling the cable (or rod) or damaging the original structure. The installation efficiency is more than 60% higher than that of traditional circumferential dampers. When a single damping unit or zipper is damaged, it can be replaced individually, and the maintenance cost is significantly reduced.

[0019] (4) Strong adaptability: The zipper belt tension can be flexibly adjusted through the limit adjustment structure to adapt to zippers of different diameters.

[0020] (5) Good durability: The core components of this device are made of corrosion-resistant and wear-resistant materials such as stainless steel and high-damping rubber. There are no problems such as oil leakage and aging. It is suitable for harsh outdoor environments and has a service life of more than 15 years, which is 50% longer than that of traditional hydraulic dampers. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure after installing micro-bulges and zipper-type vibration damping components on the cable / rod body; Figure 2 This is a perspective view of the overall structure of the cable or boom vibration control device of the present invention. Figure 3 This is a schematic diagram of the overall structure of the cable or boom vibration control device of the present invention; Figure 4 This is an enlarged cross-sectional view of the cable with a slight bulge. Figure 5 This is a schematic diagram of the limit adjustment structure in Example 2.

[0022] Wherein: 1- Cable / rod body; 2- Zipper-type vibration damping assembly; 3- End fixing structure; 4- Limit adjustment structure; 101 - Micro bulge; 1021 - Zipper strap; 1023 - Anti-slip rubber pad; 1026 - Cantilever elastic damping component; 1027 - Friction damping plate; 1031 - Hoop; 1032 - Bracket; 1034 - Elastic connector; 1035 - Universal joint; 1041 - Connecting ear plate; 1042 - Adjusting bolt. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] This embodiment provides an additional bridge cable or suspender vibration control device that can overcome the shortcomings of existing cable or suspender vibration control devices, such as complex installation, reduced damping performance, poor adaptability, and high maintenance costs. It has the advantages of convenient installation, all-dimensional vibration reduction, wide adaptability, and strong durability.

[0025] This vibration control device adopts an add-on structure and is installed on the pre-fabricated cable or rod, so that the surface of the cable or rod is uneven, which changes the airflow field on the surface of the cable. It does not require changes to the cable manufacturing process, and is convenient to install and maintain and highly adaptable.

[0026] The vibration control device includes an additional vibration control component and a limit adjustment structure. The additional vibration control component is wrapped around the outer circumference of the cable or boom to change the cross-sectional shape of the cable or boom, thereby altering the airflow field on the surface of the cable or boom. Using the additional vibration control component eliminates the need to disassemble the cable (or boom) or damage the original structure, making installation and maintenance convenient.

[0027] The limit adjustment structure is set at one or both ends of the additional vibration control component for end limit of the additional vibration control component and can adjust the enclosing tension of the additional vibration control component; and can make the diameter of the annular cavity formed by the enclosure of the additional vibration control component adjustable (adjustable within a certain range) to adapt to the installation of cables or rods with different outer diameter specifications, so as to realize flexible control of damping force.

[0028] As an example, axially distributed protrusions are formed on the outer surface of the cable or boom by an additional vibration control component.

[0029] As an example, the additional vibration control component is detachably attached to the outer surface of the cable or boom and can be replaced if damaged.

[0030] As an example, the additional vibration control components can be integrated as a single unit, or several independent additional vibration control components can be formed on the outer surface of the cable or boom and distributed along the axial direction. If a single additional vibration control component is damaged, it can be replaced individually, significantly reducing maintenance costs.

[0031] As an example, such as Figures 1-3 As shown, the additional vibration control component is a zipper-type micro-bulge structure, including: a plurality of micro-bulges 101 spaced axially along the surface of the cable / rod body 1, and a zipper-type vibration damping component 2 covering the outside of the plurality of micro-bulges 101; the micro-bulges 101 change the airflow field on the surface of the cable / rod body 1, thereby suppressing the generation of wind-induced vibration. The micro-bulges 101 are integrally formed with the cable / rod body 1 or are detachably connected.

[0032] As an example, the microbulge 101 is a hemispherical or arc-shaped protrusion structure, made of high-damping rubber or polyurethane elastomer; the diameter of the microbulge 101 is 1 / 5 to 1 / 3 of the diameter of the cable / rod body 1; the axial spacing between adjacent microbulges 101 is 2 to 3 times the diameter of the microbulge 101.

[0033] As an example, micro-bulges 101 are symmetrically distributed on two opposite sides of the outer circumference of the cable / rod body 1; that is, two sets of micro-bulges 101 are symmetrically distributed on two opposite sides of the outer circumference of the cable / rod body 1, and several micro-bulges 101 in each set are spaced apart along the axial direction.

[0034] The zipper-type vibration damping component 2 includes two symmetrically arranged flexible zipper straps 1021 and damping units distributed on the zipper straps 1021. The two zipper straps 1021, after being enclosed by an interlocking structure (each zipper strap 102 is connected to the other zipper strap 1021 on both sides via an interlocking structure), cover the periphery of the portion of the cable / rod body 1 with micro-bulges 101 (i.e., all micro-bulges 101 on the surface of the cable / rod body 1 are wrapped by the enclosing two zipper straps 1021). The inner side of the zipper straps 1021 has grooves at the positions of the micro-bulges 101 that fit within them. After the two zipper straps 1021 are enclosed, the micro-bulges 101 on the surface of the cable / rod body 1 are embedded in the grooves of the zipper straps 1021, achieving positioning and anti-slip fixation relative to the cable / rod body 1.

[0035] As an example, the zipper tape 1021 is made of stainless steel or high-strength engineering plastic, and the meshing structure includes mutually compatible chain teeth and zipper pull; the inner groove of the zipper tape 1021 is provided with an anti-slip rubber pad 1023, and the surface of the anti-slip rubber pad 1023 is provided with a groove that matches the micro-bulge 101.

[0036] The damping unit arranged on the outside of the zipper tape 1021 can suppress in-plane, out-of-plane, and axial multi-directional vibrations, reduce the vibration frequency bandwidth, and adapt to cables or booms with different vibration frequencies. As an example, the damping unit includes: a cantilever elastic damper 1026 and a friction damping plate 1027. Several cantilever elastic dampers 1026 are spaced apart along the axial direction of the cable / boom on the outside of the zipper tape 1021, preferably evenly spaced. One end of the cantilever elastic damper 1026 is fixedly connected to the outer surface of the zipper tape 1021, and the other end is a free end. When the zipper tape 1021 vibrates with the cable / boom body 1, the cantilever elastic damper 1026 undergoes oscillation and torsional elastic deformation to dissipate vibration energy.

[0037] A friction damping plate 1027 is disposed between the micro-bulge 101 and the anti-slip rubber pad 1023, and the friction damping plate 1027 is made of wear-resistant ceramic material; thus, as Figure 4 As shown, the cable / rod with the micro-bulge 101 consists of the following components from the inside out: cable / rod body 1, micro-bulge 101, friction damping plate 1027, anti-slip rubber pad 1023, and zipper tape 1021.

[0038] The zipper tape 1021 surrounds and hugs the outside of the cable / rod body 1 with micro-bulges 101. When the cable or rod vibrates or is disturbed by external airflow, the zipper tape 1021 moves synchronously with the cable or rod, causing the outer cantilever elastic damping element 1026 to reciprocate elastically, thereby realizing elastic damping energy dissipation; it forms a double damping energy dissipation structure with the inner friction damping plate 1027.

[0039] As an example, the cable or suspender is fixedly connected to the bridge beam or tower column via an end fixing structure. Preferably, the end fixing structure includes a clamp 1031 and a bracket 1032. The clamp 1031 is sleeved on the end of the cable / suspender body 1, and the bracket 1032 is fixedly connected to the bridge beam or tower column. The clamp 1031 and the bracket 1032 are connected by an elastic connector 1034.

[0040] As an example, the elastic connector 1034 is a stainless steel wire rope or a high-elasticity rubber rod. Both ends of the elastic connector 1034 are connected to the clamp 1031 and the bracket 1032 respectively through universal joints 1035, which can realize multi-directional angle compensation and adapt to the installation position offset caused by bridge deformation.

[0041] As an example, the outer side of the cable / rod body 1 is wrapped with an anti-corrosion protective layer made of polytetrafluoroethylene with a thickness of 0.5mm to 1mm.

[0042] Example 2: Based on the above embodiment 1, this embodiment provides a preferred structural form of the limit adjustment structure.

[0043] The limiting adjustment structure 4 is located at both ends of the zipper tape 1021 and is used to adjust the enclosing tension of the zipper tape 1021. In this example, the limiting adjustment structure 4 includes: connecting ear plates 1041 and adjusting bolts 1042; connecting ear plates 1041 are provided opposite to each other at the ends of the two zipper tapes 1021 (the connecting ear plates 1041 are offset from the sides of the zipper tapes 1021 where the meshing structure is located by a certain distance), and the adjusting bolts 1042 are threadedly engaged with the two connecting ear plates 1041. The precise adjustment of the enclosing tension of the zipper tapes 1021 is achieved through the helical transmission of the adjusting bolts 1042: when the adjusting bolts 1042 are tightened, the adjusting bolts 1042 pull the connecting ear plates 1041 on both sides closer together, so that the zipper tape... The circumference of the annular cavity formed by the zipper strap 1021 decreases, thereby increasing the radial clamping force and enclosing tension of the zipper strap 1021 on the cable / rod body 1 with micro-bulges 101, improving the adhesion and pressing degree between the inner friction damping plate 1027 and the surface of the cable / rod body 1, and enhancing the damping energy dissipation effect; when the adjusting bolt 1042 is loosened, the distance between the connecting ear plates 1041 on both sides increases, the circumference of the annular cavity enclosed by the zipper strap 1021 increases, and the enclosing tension decreases accordingly; thus, it can be adapted to the installation of cables or rods with different outer diameter specifications, and realize flexible adjustment of damping force.

[0044] As an example, the limit adjustment structure 4 also includes a tension sensor, which is linked to the adjusting bolt 1042 to monitor the enclosing tension of the zipper tape 1021 in real time and provide feedback for adjustment. Specifically, the tension sensor is located between the adjusting bolt 1042 and the connecting ear plate 1041, or on the adjusting bolt 1042, to detect the axial force on the adjusting bolt 1042 and to characterize the enclosing tension of the zipper tape 1021 by the axial force.

[0045] The limit adjustment structure 4 can also adopt other structures, such as a buckle structure with adjustable tightness, which can adjust the enclosing diameter and enclosing tension by adjusting the tightness of the buckle structure.

[0046] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An additional vibration control device for bridge cables or suspenders, characterized in that, include: Additional vibration control components and limit adjustment structure (4); The additional vibration control component is wrapped around the outer circumference of the cable / rod body (1) and is used to change the cross-sectional shape of the cable or rod; The limiting adjustment structure (4) is provided at one or both ends of the additional vibration control component for limiting the end of the additional vibration control component and for adjusting the enclosing diameter and enclosing tension of the additional vibration control component.

2. The additional bridge cable or suspender vibration control device as described in claim 1, characterized in that, The additional vibration control assembly forms axially spaced protrusions on the outer surface of the cable / rod body (1).

3. The additional bridge cable or suspender vibration control device as described in claim 1, characterized in that, The additional vibration control assembly includes: a plurality of micro-bulges (101) spaced axially on the surface of the cable / rod body (1) and a zipper-type vibration damping assembly (2) covering the plurality of micro-bulges (101).

4. The additional bridge cable or suspender vibration control device as described in claim 1, characterized in that, The zipper-type vibration damping assembly (2) includes two symmetrically arranged flexible zipper strips (1021) and damping units distributed on the zipper strips (1021); The two zipper straps (1021) are enclosed and covered by the part of the cable / rod body (1) with a micro-bulge (101) by an interlocking structure; The inner side of the zipper tape (1021) is provided with a slot that matches the micro-bulge (101) at the position of the micro-bulge (101); after the two zipper tapes (1021) are closed, the micro-bulge (101) is embedded in the corresponding slot; the slot is provided with an anti-slip rubber pad (1023).

5. The additional bridge cable or suspender vibration control device as described in claim 4, characterized in that, The damping unit includes: a cantilever elastic damping element (1026) and a friction damping plate (1027). Several cantilever elastic damping elements (1026) are spaced apart along the axial direction of the cable / rod body (1) on the outside of the zipper tape (1021); one end of the cantilever elastic damping element (1026) is fixedly connected to the outer surface of the zipper tape (1021), and the other end is a free end; The friction damping sheet (1027) is disposed between the anti-slip rubber pad (1023) and the micro-bulge (101).

6. The additional bridge cable or suspender vibration control device as described in any one of claims 3-5, characterized in that, The micro-bulge (101) is integrally formed with the cable / rod body (1) or can be detachably connected.

7. The additional bridge cable or suspender vibration control device as described in any one of claims 3-5, characterized in that, The micro-bulge (101) is hemispherical and has a diameter of 1 / 5 to 1 / 3 of the diameter of the cable / rod body (1); the axial distance between adjacent micro-bulges (101) is 2 to 3 times the diameter of the micro-bulge (101).

8. The additional bridge cable or suspender vibration control device as described in claim 1, characterized in that, The limiting adjustment structure (4) includes: a connecting ear plate and an adjusting bolt; The ends of the two zipper straps (1021) are provided with connecting ear plates. The adjusting bolt is threadedly engaged with the two connecting ear plates. The tightening or loosening of the adjusting bolt can adjust the enclosing diameter and enclosing tension of the two zipper straps.

9. The additional bridge cable or suspender vibration control device as described in claim 8, characterized in that, The limiting adjustment structure (4) also includes a tension sensor, which is used to monitor the enclosure tension of the zipper tape (1021) in real time.

10. The additional bridge cable or suspender vibration control device as described in claim 1, characterized in that, The cable or suspender body (1) is fixedly connected to the bridge beam or tower column through the end fixing structure; The end fixing structure includes a clamp (1031) and a bracket (1032). The clamp (1031) is sleeved on the end of the cable / suspender body (1). The bracket (1032) is fixedly connected to the bridge beam or tower column. The clamp (1031) and the bracket (1032) are connected by an elastic connector (1034).

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