CN116219863A - External damping device of suspension bridge sling - Google Patents

Abstract

The invention discloses an external damping device for a sling of a suspension bridge, which relates to the technical field of damping devices, and comprises a force transmission lever which is arranged at intervals with the sling; a dowel assembly, comprising: a lower dowel bar assembly, one end of which is used for being connected with the bottom of the sling, and the other end of which is rotationally connected with the middle part of the dowel bar, so as to divide the dowel bar into a resistance arm and a power arm; -an upper dowel bar assembly having one end for connection to a sling and the other end for rotational connection to an end of a resistance arm; and the damping structure is arranged at the end part of the power arm and is used for being fixed on the main beam. When the device is used, the characteristic that the displacement of the bottom of the sling is very small and almost zero is utilized, the rotation point in the middle of the force transmission lever is used as a fulcrum and is divided into a resistance arm and a power arm, the other end of the upper force transmission lever 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, and vibration is amplified and transmitted to the damping structure.

Description

External damping device of suspension bridge sling

Technical Field

The invention relates to the technical field of damping vibration attenuation devices, in particular to an external damping device for a sling of a suspension bridge.

Background

With the construction of large-span suspension bridges, the characteristics of thin and long suspension ropes, small damping and more vibration modes are more and more obvious, and various types of vibration, such as vortex vibration, relaxation vibration, buffeting, parameter vibration and the like, are easy to occur under the action of external wind load and traffic load. The continuous vibration of the sling not only can cause the fatigue cracking of the PE sheath of the sling and the fatigue damage of the waterproof sealing component at the anchoring end, so that rainwater and moist air enter the rope body, the anchor head and the accessory component, and further the rust and the fracture of the sling steel wire, the corrosion fatigue damage of the anchor head and the accessory component occur, the occurrence of the accidents of the fatigue damage and even the fracture of the sling at home and abroad can be caused, and the cost of replacing the cable of a bridge is high to hundreds of millions of yuan. In addition, the continuous vibration of the sling can also cause uncomfortable feeling and unsafe feeling of pedestrians, and the normal operation of the bridge is affected. Therefore, effective measures should be taken for control.

The modern large-span suspension bridge adopts double slings or multiple slings which are vertically arranged in parallel, and compared with single ropes, the suspension bridge is more complicated and diversified in vibration, and in view of vibration mode, the suspension bridge has the vibration mode of relative movement between slings and the vibration mode of synchronous movement of slings; from a frequency perspective, the sling may vibrate in combination at multiple frequencies, depending on the external stimulus. The vibration reduction method of the suspension bridge slings with multiple large spans at home and abroad is referred to, and the problem of large vibration of the suspension bridge slings can not be fundamentally solved. The main technical difficulty is that the sling has wide vibration frequency and needs to meet the control requirements of the same phase and opposite phase, in-plane and out-of-plane vibration of a plurality of slings. Therefore, there is an urgent need to develop a sling vibration damping technology with strong adaptability, wider vibration damping frequency domain coverage, excellent vibration damping effect, convenient installation and maintenance and small influence on bridge landscape.

The external damper of traditional hoist cable is based on suspension cable damping technique, but is different from suspension cable external damper and directly supports on the girder, generally needs to arrange special vertical support basis, in order to obtain better damping effect, has put forward higher requirement to mounting height and support rigidity, has the inconvenient problem of damper installation, needs to install special support basis.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an external damping device for a suspension bridge sling, which can solve the problems of inconvenient installation of a damper and special support foundation installation in the prior art.

In order to achieve the above purpose, the invention adopts the following technical scheme:

provided is an external damping device for a suspension bridge sling, which comprises:

the force transmission lever is used for being arranged at intervals with the sling;

a dowel assembly, comprising:

-a lower dowel bar assembly, one end of which is adapted to be connected to the bottom of the sling and the other end of which is rotatably connected to the middle part of the dowel bar, dividing the dowel bar into a resistance arm and a power arm;

-an upper dowel bar assembly having one end for connection to the slings and the other end for rotational connection to the ends of the resistance arms;

and the damping structure is arranged at the end part of the power arm and is used for being fixed on the main beam.

On the basis of the technical proposal, the method comprises the following steps,

in some alternative solutions, the lower dowel assembly includes two bottom dowel bars, one ends of the two bottom dowel bars are respectively connected to bottoms of two parallel slings, and the other ends of the two bottom dowel bars are inclined upwards and are rotatably connected to the middle part of the dowel lever.

In some alternative solutions, the upper dowel assembly includes two upper dowel bars, one ends of the two upper dowel bars are respectively connected with two parallel slings, and the other ends of the two upper dowel bars are connected with the ends of the resistance arms in a rotating manner in an inclined downward manner.

In some alternatives, the end of the power arm is provided with an inertial mass structure.

In some alternatives, the damping structure comprises:

a damping container for being arranged on the main beam and for containing viscous materials;

and the damping plugboard is arranged at the end part of the power arm, and the damping plugboard is partially positioned in the viscous material.

In some alternatives, the inertial mass structure is a sleeve structure with a downward opening, and the sleeve structure is covered on the outer side of the damping container.

In some alternatives, the damping insert plate includes:

the upper end of the at least one force transmission column is connected with the end part of the power arm;

and the inserting plate is connected with the lower end of the force transmission column and positioned in the viscous material, and the outer diameter of the inserting plate is smaller than the inner diameter of the damping container.

In some alternative schemes, the plugboard is a circular plugboard, and four force transmission columns are uniformly connected to the upper side of the circular plugboard at intervals.

In some alternatives, the insert plate is perpendicular to the sling, and the insert plate is provided with a through hole along the axial direction of the force transmission column.

In some alternatives, the force transfer post is removably connected to an end of the power arm.

Compared with the prior art, the invention has the advantages that:

when the external damping device for the suspension bridge sling is used, the force transmission lever and the sling are arranged at intervals, one end of the lower force transmission lever assembly is connected with the bottom of the sling, the other end of the lower force transmission lever assembly is rotationally connected with the middle part of the force transmission lever, one end of the upper force transmission lever assembly is connected with the sling, the other end of the upper force transmission lever assembly is rotationally connected with the end part of the resistance arm, and the damping structure is arranged on the main beam and is connected with the end part of the power arm. Through the direct bottom connection with the hoist cable of lower dowel bar subassembly one end, utilize the very little nearly zero characteristics of hoist cable bottom displacement, can regard as the fulcrum of amplifying the lever with the rotation point at dowel bar middle part, divide into resistance arm and power arm with dowel bar, make dowel bar subassembly one end and hoist cable be connected again, the other end is connected with the tip rotation of resistance arm, make damping structure work in order to realize damping effect after amplifying vibration with damping structure and power arm's end connection, have the characteristics that need not to arrange special vertical support basis, simple to operate, the problem that the attenuator that exists among the prior art is inconvenient in the installation of needs the installation special support basis has been solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic side view of an embodiment of an external damping device for a suspension bridge sling according to the present invention;

FIG. 2 is a schematic diagram of an embodiment of an external damping device for a suspension bridge sling according to the present invention;

FIG. 3 is a schematic front view of an embodiment of an external damping device for a suspension bridge sling according to the present invention;

FIG. 4 is a schematic diagram of a force transmission lever of an embodiment of an external damping device for a suspension bridge sling according to the present invention;

FIG. 5 is a schematic view of a single-layer insert plate of an embodiment of an external damping device for a suspension bridge sling according to the present invention;

FIG. 6 is a schematic view of a hollow insert plate of an embodiment of an external damping device for a suspension bridge sling according to the present invention;

FIG. 7 is a schematic view of a double deck board of an embodiment of an external damping device for a suspension bridge sling according to the present invention;

fig. 8 is a schematic structural view of a damping container of an embodiment of an external damping device for a suspension bridge sling according to the present invention.

In the figure: 1. a force transmission lever; 11. resistance arm; 12. a power arm; 13. a first spherical hinge; 14. a second spherical hinge; 2. a dowel bar assembly; 21. an upper dowel bar assembly; 211. a dowel bar at the upper end; 22. a lower dowel bar assembly; 221. a bottom dowel bar; 3. a sling; 4. a main beam; 5. an inertial mass structure; 6. a damping structure; 61. damping plugboard; 611. a force transmission column; 612. inserting plate; 62. damping container.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

An embodiment of an external damping device for a suspension bridge sling according to the present invention is described in further detail below with reference to the accompanying drawings.

As shown in fig. 1 and 4, an external damping device for a suspension bridge sling includes:

a force transmission lever 1 for being arranged at intervals from the sling 3;

dowel assembly 2, comprising:

a lower dowel bar assembly 22, one end of which is adapted to be connected to the bottom of the sling 3 and the other end of which is rotatably connected to the middle of the dowel bar 1, dividing the dowel bar 1 into a resistance arm 11 and a power arm 12;

an upper dowel bar assembly 21, one end of which is intended to be connected to the sling 3 and the other end of which is connected in rotation to the end of the resistance arm 11;

damping structure 6, which is provided at the end of power arm 12, is intended to be fixed to main beam 4.

When the external damping device for the suspension bridge sling is used, the force transfer lever 1 and the sling 3 are arranged at intervals, one end of the lower force transfer lever assembly 22 is connected with the bottom of the sling 3, the other end of the lower force transfer lever assembly is rotatably connected with the middle part of the force transfer lever 1, one end of the upper force transfer lever assembly 21 is connected with the sling 3, the other end of the upper force transfer lever assembly is rotatably connected with the end part of the resistance arm 11, and the damping structure 6 is arranged on the main beam 4 and is connected with the end part of the power arm 12. Through the direct bottom connection with hoist cable 3 of lower dowel bar subassembly 22 one end, utilize hoist cable 3 bottom displacement very little nearly zero's characteristics, can regard as the fulcrum of amplifying the lever with the rotation point at dowel bar 1 middle part, divide dowel bar 1 into resistance arm 11 and power arm 12, make again dowel bar subassembly 21 one end and hoist cable 3 be connected, the other end rotates with the tip of resistance arm 11 to be connected, end connection with damping structure 6 and power arm 12, make damping structure 6 work in order to realize damping effect after amplifying vibration, have the characteristics that need not to arrange special vertical support basis, simple to operate, the problem of the attenuator installation inconvenient that exists in the prior art needs the installation special support basis has been solved.

In this example, the end of the resistance arm 11 is connected to the upper dowel bar assembly 21 through the first ball joint 13, the upper dowel bar assembly 21 is provided with a hinge seat, the hinge seat is rotatably provided with a rotating ball, and the rotating ball is rotatably connected to the end of the resistance arm 11.

The rotation point in the middle of the force transmission lever 1 is provided with a second spherical hinge 14, the force transmission lever 1 is divided into a resistance arm 11 and a power arm 12 by the second spherical hinge 14, and a lower force transmission rod assembly 22 is rotatably connected with the second spherical hinge 14.

In some alternative embodiments, as shown in fig. 2 and 3, the lower dowel assembly 22 comprises two bottom dowel bars 221, one end of each of the two bottom dowel bars 221 being adapted to be connected to the bottom of two parallel slings 3, and the other end being inclined upwards and being pivotally connected to the middle of the dowel lever 1.

In this embodiment, by utilizing the characteristic that the displacement of the bottom of the sling 3 is very small and almost zero, one end of each of the two bottom dowel bars 221 is fixedly connected with the bottoms of the two parallel slings 3, and the other end of each of the two bottom dowel bars is obliquely upwards connected with the middle part of the dowel lever 1 in a rotating manner, the resistance arm 11 can be shortened, and meanwhile, the power arm 12 can be lengthened, so that a larger lever amplification factor can be obtained.

In some alternative embodiments, as shown in fig. 3, the upper dowel assembly 21 includes two upper dowel bars 211, one end of each upper dowel bar 211 being adapted to be connected to two parallel slings 3, and the other end being pivotally connected to the ends of the resistance arms 11 in an inclined downward direction.

In this embodiment, by utilizing the characteristic that the vibration displacement of the upper end of the sling 3 is larger, one end of the two upper end dowel bars 211 is respectively connected with the two parallel slings 3, and the other end is connected with the end of the resistance arm 11 in a rotating manner in a downward inclined manner, larger vibration displacement can be obtained, and the installation height of the damper is reduced.

In some alternative embodiments, as shown in fig. 4, the end of the power arm 12 is provided with an inertial mass structure 5.

In this embodiment, the inertial mass structure 5 is disposed at the end of the power arm 12, so as to provide inertial force at the lower end of the force transmission lever 1, so as to enhance the use effect of the lever mass damping device.

As shown in fig. 5 and 8, in some alternative embodiments, the damping structure 6 includes:

a damping container 62 for being provided on the main beam 4 for holding a viscous material;

a damping insert 61 provided at the end of the power arm 12, the damping insert 61 being partially located in the viscous material.

In this embodiment, the damping structure 6 includes a damping container 62 and a damping insert plate 61, the damping container 62 is disposed on the main beam 4, in which the viscous material is contained, the damping insert plate 61 is connected with an end portion of the power arm 12, and the damping insert plate 61 is partially located in the viscous material, so as to shear the viscous material when the sling 3 vibrates, and the damping insert plate is simple in structure and convenient to install.

In some alternative embodiments, as shown in fig. 4 and 5, the inertial mass structure 5 is a downwardly opening sleeve structure that is housed outside of the damping container 62.

In this embodiment, the inertial mass structure 5 is set to be a sleeve structure with a downward opening, the sleeve structure is covered on the outer side of the damping container 62, the sleeve structure can have a certain protection effect on the damping structure 6 to prevent foreign matters from falling into the viscous material in the damping container 62, and a certain gap exists between the sleeve structure and the damping container 62 to prevent the sleeve structure from colliding with the damping container 62 when vibrating along with the force arm 12.

As shown in fig. 5 and 7, in some alternative embodiments, the damping insert plate 61 includes:

at least one force-transmitting post 611, the upper end of which is connected to the end of the power arm 12;

at least one layer of insert plate 612, which is connected to the lower end of the force-transmitting post 611, is located within the viscous material, the insert plate 612 having an outer diameter smaller than the inner diameter of the damping container 62.

In this embodiment, the damping insert 61 includes at least one force transmission column 611 and at least one layer of insert 612, the upper end of the force transmission column 611 is connected with the end of the power arm 12, the insert 612 is connected with the lower end of the force transmission column 611, and is located in the viscous material, so that a better damping effect can be achieved, and when the vibration displacement of the sling 3 is amplified and transferred to the damping structure 6, the insert 612 does not collide with the damping container 62.

In some alternative embodiments, as shown in fig. 5 and 7, the insert 612 is a circular insert, and four force-transmitting posts 611 are connected to the upper side of the circular insert at uniform intervals.

In this embodiment, the insert plate 612 is a circular insert plate, and four force transmission columns 611 are uniformly connected to the upper side of the circular insert plate at intervals, so that the insert plate 612 is better connected with the bottom of the thickened sleeve, the structure of the damping insert plate 61 is more stable, and better shearing action can be realized.

In some alternative embodiments, as shown in fig. 6, the insert plate 612 is perpendicular to the slings 3, the insert plate 612 being provided with through holes in the axial direction of the force transmission column 611.

In this embodiment, the plane of the insert plate 612 is perpendicular to the axis of the sling 3, and the insert plate 612 is provided with a through hole along the axial direction of the force transmission column 611, so that the sling 3 can horizontally transmit vibration to the damper in all directions, thereby dissipating vibration energy, and increasing the contact area between the insert plate 612 and the viscous material in the horizontal direction, so as to improve the damping effect.

In some alternative embodiments, the force transfer post 611 is removably connected with the end of the power arm 12.

In this embodiment, the force-transmitting post 611 is detachably connected to the end of the power arm 12, and the damping insert plate 61 can be replaced as required to change the damping coefficient of the damping structure 6, so that the damping insert plate 61 can be replaced conveniently when damaged.

In summary, when the external damping device for suspension bridge slings is used, the force transfer lever 1 and the slings 3 are arranged at intervals, one ends of the two bottom force transfer levers 221 are respectively connected with the bottoms of the two parallel slings 3, the other ends of the two bottom force transfer levers 221 are obliquely upwards connected with the middle part of the force transfer lever 1 in a rotating manner, the resistance arm 11 can be shortened, the power arm 12 is lengthened, a larger lever amplification factor is obtained, one ends of the two upper end force transfer levers 211 are respectively connected with the two parallel slings 3, the other ends of the two upper end force transfer levers are obliquely downwards connected with the end parts of the resistance arm 11 in a rotating manner, a larger vibration displacement can be obtained, the mounting height of the damper is reduced, the damping container 62 is arranged on the main beam 4, and the damping plugboard 61 is connected with the end parts of the power arm 12. Through the direct bottom connection with hoist cable 3 of lower dowel bar subassembly 22 one end, utilize hoist cable 3 bottom displacement very little nearly zero's characteristics, can regard as the fulcrum of amplifying the lever with the rotation point at dowel bar 1 middle part, divide dowel bar 1 into resistance arm 11 and power arm 12, make again dowel bar subassembly 21 one end and hoist cable 3 be connected, the other end rotates with the tip of resistance arm 11 to be connected, end connection with damping structure 6 and power arm 12, make damping structure 6 work in order to realize damping effect after amplifying vibration, have the characteristics that need not to arrange special vertical support basis, simple to operate, the problem of the attenuator installation inconvenient that exists in the prior art needs the installation special support basis has been solved.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An external damping device of suspension bridge hoist cable, characterized by comprising:

the force transmission lever (1) is used for being arranged at intervals with the sling (3);

dowel assembly (2), comprising:

-a lower dowel bar assembly (22) with one end for connection to the bottom of the sling (3) and the other end for rotational connection to the middle of the dowel bar (1), dividing the dowel bar (1) into a resistance arm (11) and a power arm (12);

-an upper dowel bar assembly (21) with one end for connection to the sling (3) and the other end in rotational connection to the end of the resistance arm (11);

and the damping structure (6) is arranged at the end part of the power arm (12) and is used for being fixed on the main beam (4).

2. An external damping device for suspension bridge slings according to claim 1, characterized in that the lower dowel assembly (22) comprises two bottom dowel bars (221), one end of each of the two bottom dowel bars (221) being adapted to be connected to the bottom of two parallel slings (3), and the other end being inclined upwards and being pivotally connected to the middle of the dowel lever (1).

3. An external damping device for suspension bridge slings according to claim 1, characterized in that the upper dowel bar assembly (21) comprises two upper dowel bars (211), one end of each of the two upper dowel bars (211) is connected to two parallel slings (3), and the other end is connected to the end of the resistance arm (11) in a rotating manner in a downward inclined manner.

4. An external damping device for a suspension bridge sling as defined in claim 1, wherein the end of the power arm (12) is provided with an inertial mass structure (5).

5. An external damping device for a suspension bridge sling as defined in claim 4, wherein said damping structure (6) comprises:

a damping container (62) for being arranged on the main beam (4) for containing viscous material;

and a damping insert plate (61) arranged at the end of the power arm (12), wherein the damping insert plate (61) is partially positioned in the viscous material.

6. An external damping device for a suspension bridge sling as defined in claim 5, wherein said inertial mass structure (5) is a downwardly opening sleeve structure, said sleeve structure being housed outside said damping container (62).

7. An external damping device for a suspension bridge sling as defined in claim 5, wherein said damping insert (61) comprises:

at least one force transmission column (611) the upper end of which is connected with the end of the power arm (12);

at least one layer of insert plate (612) connected to the lower end of the force transmission column (611) and located in the viscous material, the insert plate (612) having an outer diameter smaller than the inner diameter of the damping container (62).

8. An external damping device for suspension bridge slings according to claim 7, characterized in that said insert plate (612) is a circular insert plate, and four said force transmission columns (611) are connected to the upper side of said circular insert plate at uniform intervals.

9. An external damping device for a suspension bridge sling as defined in claim 8, wherein said insert plate (612) is perpendicular to the sling (3), and said insert plate (612) is provided with a through hole along the axial direction of said force transmission column (611).

10. An external damping device for suspension bridges slings according to claim 7, characterized in that the force transmission post (611) is detachably connected to the end of the power arm (12).

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