CN102943438B - External vibration absorber capable of inhibiting vibration of stay cable - Google Patents
External vibration absorber capable of inhibiting vibration of stay cable Download PDFInfo
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- CN102943438B CN102943438B CN201210514373.1A CN201210514373A CN102943438B CN 102943438 B CN102943438 B CN 102943438B CN 201210514373 A CN201210514373 A CN 201210514373A CN 102943438 B CN102943438 B CN 102943438B
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Abstract
The invention discloses an external vibration absorber capable of inhibiting vibration of a stay cable, and the external vibration absorber comprises a rigid connecting rod and a lever assembly, wherein a first end of the rigid connecting rod is hinged with a cable clamp, the two ends of the lever assembly are respectively connected with a support and a damper, the lever assembly comprises a first lever, a second lever, a third lever and a connecting shaft, the first end of the first lever is hinged in the support by virtue of a first pin shaft, a hinged support is arranged on the outer circumferential surface of the second lever, a second end of the rigid connecting rod is hinged with the hinged support by virtue of a second pin shaft, a first end of the third lever is fixed with the damper, the connecting shaft is rotatably arranged in the second lever, and the two ends of the connecting shaft are respectively fixed together with the second end of the first lever and a second end of the third lever. According to the external vibration absorber capable of inhibiting vibration of the stay cable disclosed by the invention, the rigid connecting rod connected with the lever assembly can drive the first lever, the second lever, the third lever and the damper to swing up and down around the support and also can drive the second lever to rotate around the axis of the second lever, so that in-plane and out-of-plane vibration of the stay cable is reduced, and the requirement of vibration absorption on the stay cables in cable-stayed bridge construction and an operation stage can be realized.
Description
Technical field
The present invention relates to shock absorber, be specifically related to suppress the external shock absorber of Inclined Cable Vibration, for Construction of Large-sized Cable-stay Bridge and operation process, Inclined Cable Vibration is controlled.
Background technology
The suspension cable of large span stayed-cable bridge is the main load-carrying member of cable stayed bridge, along with the continuous increase of cable stayed bridge span, it is more and more longer that suspension cable becomes, because suspension cable is long and soft, its bending rigidity is little, very easily under the dynamic excitations such as wind, wind-rain, earthquake and traffic, there is excessive vibration, even produce and significantly disperse vibration.The vibration of suspension cable will make it for a long time under alternating stresses ringing significantly, concentrate comparatively serious staying cable anchorage zone at stress, easily produce the fatigue failure of rope, serious vibration go back entail dangers to girder construction, cause beam body crackle, the vibration of suspension cable also can make its hot extrusion high density polyethylene (HDPE) (PE) sheath and suspension cable end noose tracheal rupture, infiltration occurs and corrosion.Suspension cable vibrates again accelerating the stress corrosion of rope under high-stress state, and greatly shortened the fatigue life of suspension cable.The significantly vibration of suspension cable, also can make pedestrian and vehicle produce discomfort and sense of insecurity, affects the normal operation of bridge.Therefore the vibration of controlling oblique suspension cable is very important.
For this reason, Chinese invention patent CN101709567A discloses " a kind of mass damping device of rigid connection space lever of stay cable " (application number: CN200910272400.7), by rigid connecting rod by inclined cable face and rope face outside vibration displacement transfer to rotating lever, and rotating lever one end is connected with lever support by longitudinal connecting component, and can rotate up and down and rotate around self central axis around lever support, other end quality of connection piece and damper, when in inclined cable face or when rope out-of-plane vibration, vibration displacement passes to rotating lever by rigid connecting rod, drive rotating lever, mass, damper rotates up and down or around rotating lever central axis, produce inertia force, elastic force, damping force, when rope out-of-plane vibration, lever support is combined with the high damping of longitudinal connecting component also to provide and is rotated frictional resistance and viscous force, through the amplification of rotating lever, return suspension cable by rigid connecting rod transmission, change the modal mass of suspension cable, rigidity and damping, thereby effectively suppress the vibration in inclined cable face or outside rope face.
As everyone knows, along with the adjustment of Suo Li in work progress, setting out and main beam linear all change, thereby cause cord clip installation site to change, because foregoing invention adopts regular length connecting rod, and lever end is placed damper, under the drive of connecting rod, mass and built-in damper rotate moving axis occur up and down rotate, because built-in damper cavity space is limited, easily bump, when serious, damage shock absorber.Therefore, the technical scheme that foregoing invention provides can not realize self adaptation for construction stage and operation phase vibration damping, needs the artificial installation site of adjusting, more inconvenient.
Summary of the invention
Technical problem to be solved by this invention is to solve suspension cable shock absorber can not realize self adaptation in construction stage and operation phase vibration damping, needs artificial installation site, the more inconvenient problem adjusted.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide a kind of external shock absorber that suppresses Inclined Cable Vibration, comprises rigid connecting rod and lever assembly, and the first end of described rigid connecting rod is hinged with the cord clip for fixing suspension cable; Described lever assembly is horizontally disposed with, two ends be connected with respectively for fixing bearing and the damper of bridge floor, the direction of motion of described damper is setting up and down; Described lever assembly comprises first, second, third and connecting axle, and the first end of described the first lever is hinged on and in described bearing, is formed the first pin joint by the first bearing pin, and the axis of described the first bearing pin is vertical with the axis of described the first lever; The outer circumference surface of described the second lever is provided with free bearing, and the second end of described rigid connecting rod is by the second bearing pin and hinged formation the second pin joint of described free bearing, and the axis of described the second bearing pin is vertical with the axis of described the second lever; The first end of described the 3rd lever and described damper are fixed; Described connecting axle rotation is arranged in described the second lever and two ends are fixed with the second end of described the first lever and the second end of described the 3rd lever respectively.
In such scheme, the first end of described the first lever is provided with rubbing device, and described rubbing device comprises two junction plates and spring, and described two junction plates are oppositely arranged, and one end is fixed with the first end of described the first lever respectively, the lateral surface of the other end is provided with brake pad; Described spring is fixedly installed between two described junction plates and two described brake pads is offseted with the inwall of described bearing respectively, provides friction required normal pressure.
In such scheme, the axis of described rigid connecting rod is vertical with the axis of suspension cable.
In such scheme, the line between described the first pin joint and described the second pin joint is vertical with the axis of described rigid connecting rod.
In such scheme, described damper comprises mass, upper container and lower container, described mass has an inner chamber that Open Side Down, described upper container is fixed in described inner chamber, in described upper container, be provided with length direction along vertical bridge to the polylith plate arranging, described lower container has multiple damping cavity of the described plate of coupling, in described damping cavity, is provided with damping fluid, and described plate is inserted in described damping cavity from top to bottom.
In such scheme, described mass is formed by pouring concrete.
The present invention, by the improvement to lever assembly, make the rigid connecting rod being connected with lever assembly can drive first, second, third lever and damper to swing up and down around bearing, and can drive the second lever to rotate around lever self axis, thereby alleviate in plane vibration and the out-of-plane vibration of suspension cable, can realize simultaneously Cable-Stayed Bridges and operation stage suspension cable vibration damping needs.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the internal construction front view of bearing in the present invention;
Fig. 3 is the internal construction lateral view of bearing in the present invention;
Fig. 4 is the structural representation of lever assembly in the present invention;
Fig. 5 is the front view of damper in the present invention;
Fig. 6 is the lateral view of damper in the present invention.
Detailed description of the invention
The external shock absorber of inhibition Inclined Cable Vibration provided by the invention, by the improvement to lever assembly, make the rigid connecting rod being connected with lever assembly can drive first, second, third lever and damper to swing up and down around bearing, and can drive the second lever to rotate around lever self axis, thereby alleviate in plane vibration and the out-of-plane vibration of suspension cable, can realize simultaneously Cable-Stayed Bridges and operation stage suspension cable vibration damping needs.Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, the external shock absorber of inhibition Inclined Cable Vibration provided by the invention comprises rigid connecting rod 4, lever assembly, bearing 6 and damper.
The first end of rigid connecting rod 4 is by the hinged cord clip 2 for fixing suspension cable 1 of bearing pin 3, the second end is hinged on the middle part of lever assembly, lever assembly is horizontally disposed with, the bottom surface of bearing 6 and damper is separately fixed on bridge floor and bearing 6 and damper are separately positioned on the two ends of lever assembly, and the direction of motion of damper is set to move up and down.The axis of rigid connecting rod 4 is vertical with drag-line 1, and when guarantee drag-line 1 vibrates, displacement all passes to rigid connecting rod 4, reduces to pass to the displacement loss of lever assembly, but ensures that the power of shaking reaches maximum.
Refer to again
fig. 1,fig. 4, lever assembly comprises the first lever 7, the second lever 8, the 3rd lever 9 and connecting axle 23.The first end of the first lever 7 is hinged on interior formation the first pin joint A1 of bearing 6 by the first bearing pin 18, and the axis of the first bearing pin 18 is vertical with the axis of the first lever 7; The outer circumference surface of the second lever 8 is provided with free bearing, and the second end of rigid connecting rod 4 is by the second bearing pin 5 and hinged formation the second pin joint A2 of free bearing, and the axis of the second bearing pin 5 is vertical with the axis of the second lever 8; First end and the damper of the 3rd lever 9 are fixed; Connecting axle 23 rotations are arranged in the second lever 8 and two ends are fixed with the second end of the first lever 7 and the second end of the 3rd lever 9 respectively.
Line between the first pin joint A1 and the second pin joint A2 is vertical with the axis of rigid connecting rod 4, makes the displacement of rigid connecting rod 4 all pass to lever assembly, reduces displacement loss, ensures effectiveness in vibration suppression optimum.
In the present embodiment, the second lever 8 has an axially extending bore, the two ends of axially extending bore are provided with rolling bearing 22, connecting axle 23 is thin ends and thick middle Step Shaft shape, and two ends are respectively equipped with external screw thread, connecting axle 23 is installed in the axially extending bore of the second lever 8 and coordinates with rolling bearing 22, and the second end of the second end of the first lever 7 and the 3rd lever 9 is respectively equipped with internal thread, and the second end of connecting axle 23 and the first lever 7 and the second end of the 3rd lever 9 are threaded connection and are integrated.Thereby realized the first lever 7, the second lever 8 and the 3rd lever 9 swings up and down or the second lever 8 is keeping the first lever 7 and the 3rd lever 9 motionless when self axle rotates around bearing 6 simultaneously.
Can change the multiplication factor of lever assembly by adjusting the length of the 3rd lever 9, but the convenient power size of shaking that regulates.
Refer to Fig. 2 and Fig. 3, bearing 6 is Plate Welding case structure again, comprises top board 13, base plate 15 and left and right side plate 14,16 and forward and backward side plate 17, and wherein right plate 16 is provided with opening, for ensureing that the first lever 7 rotates.The first end of the first lever 7 is inserted in bearing 6, and the first end of the first lever 7 is provided with rubbing device, but in order to the power of shaking that rubs to be provided, to suppress suspension cable wind and rain and shake.Because lever assembly rotates flexibly, the impact of loading test while not being subject to the construction stage adjust rope and become bridge.Rubbing device comprises two junction plates 20 and spring 21, two junction plates 20 are oppositely arranged, the first end of the first lever 7 is fixed with a latch 19, one end of two junction plates 20 is fixing with latch 19 respectively, the lateral surface of the other end is provided with brake pad, and spring 21 is fixedly installed between two junction plates 20 and under the effect of spring 21 elastic force two brake pads are offseted with the inwall (inner surface of forward and backward side plate 17) of bearing 6 respectively.Because spring has compressibilty, ensure that normal pressure applies continually and steadily, avoid occurring causing because normal pressure applies fault the situation that rubbing device is invalid.
Refer to again Fig. 1, Fig. 5 and Fig. 6, damper comprises mass 10, upper container 11 (is built in mass 10 inside, in figure, do not show) and lower container 12, mass 10 has an inner chamber that Open Side Down, upper container 11 is fixed in the inner chamber of mass 10, upper container 11 and lower container 12 are the case structure of Plate Welding, wherein upper container 11 has roof 24 and four sidewalls 25, 26, and on the bottom surface of roof 24, be fixed with the vertical bridge of polylith to the plate 27 arranging, lower container 12 has base plate 30, the end face of base plate 30 is provided with multiple damping cavity of the coupling plate 27 being made up of multiple side plates and dividing plate 29, in damping cavity, be provided with damping fluid 31 in order to damping force to be provided, plate 27 is inserted in damping cavity from top to bottom.Mass 10 is formed by pouring concrete, but shakes power except counterweight strengthens, and has function of heat insulation concurrently, makes upper and lower container 11,12 temperature unlikely too high, ensures the stability of damping fluid 31 damping capacities.
In addition, plate 27 length directions be designed to vertical bridge to, make mass 10 drive upper container 11 to swing up and down angle large as far as possible, reserved bridge floor mobile load increases the angle of rotation tolerance increasing while causing drag-line large-amplitude vibration.
The present invention, when suspension cable 1 vibrates, displacement is passed to lever assembly through rigid connecting rod 4, lever assembly one end is connected with the bearing bearing pin being fixed on girder, the other end is connected with damper, but the rubbing device in bearing provides the power of shaking, damper produces damping force with lever assembly motion shearing damp liquid, suppresses inhaul cable vibration.Therefore, the present invention combines enlarge-effect, friction energy-dissipating and the viscoplasticity passive energy dissipation mechanism of lever, have that effectiveness in vibration suppression is lasting, inhibition of vibration good, install the advantages such as simple, convenient for installation and maintenance, especially respond well to large-amplitude vibration, install and can suppress well that drag-line construction period is significantly vibrated and wind and rain shakes at Cable-Stayed Bridges.Cheng Qiaohou supplements damping generating means is installed, and can avoid, because bridge floor loads change produces drag-line and the excessive problem that causes shock absorber to destroy of girder relative displacement, strengthening effectiveness in vibration suppression simultaneously, and viscoplasticity vibration damping is good to the little amplitude control of drag-line especially.Frictional force and damping force acting in conjunction, complement each other, ensure the construction stage and operation stage bridge safety, be particularly useful for Inclined Cable Vibration control in Construction of Large-sized Cable-stay Bridge process.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (6)
1. the external shock absorber that suppresses Inclined Cable Vibration, comprising:
Rigid connecting rod, the first end of described rigid connecting rod is hinged with the cord clip for fixing suspension cable;
Lever assembly, is horizontally disposed with, two ends be connected with respectively for fixing bearing and the damper of bridge floor, the direction of motion of described damper is setting up and down;
It is characterized in that, described lever assembly comprises:
The first lever, the first end of described the first lever is hinged on and in described bearing, is formed the first pin joint by the first bearing pin, and the axis of described the first bearing pin is vertical with the axis of described the first lever;
The second lever, its outer circumference surface is provided with free bearing, and the second end of described rigid connecting rod is by the second bearing pin and hinged formation the second pin joint of described free bearing, and the axis of described the second bearing pin is vertical with the axis of described the second lever;
The 3rd lever, the first end of described the 3rd lever and described damper are fixed;
Connecting axle, rotation is arranged in described the second lever and two ends are fixed with the second end of described the first lever and the second end of described the 3rd lever respectively.
2. the external shock absorber of inhibition Inclined Cable Vibration as claimed in claim 1, is characterized in that, the first end of described the first lever is provided with rubbing device, and described rubbing device comprises:
Two junction plates, are oppositely arranged, and one end fixes with the first end of described the first lever respectively, and the lateral surface of the other end is provided with brake pad;
Spring, is fixedly installed between two described junction plates and two described brake pads is offseted with the inwall of described bearing respectively, provides friction required normal pressure.
3. the external shock absorber of inhibition Inclined Cable Vibration as claimed in claim 1, is characterized in that, the axis of described rigid connecting rod is vertical with the axis of suspension cable.
4. the external shock absorber of inhibition Inclined Cable Vibration as claimed in claim 1, is characterized in that, the line between described the first pin joint and described the second pin joint is vertical with the axis of described rigid connecting rod.
5. the external shock absorber of inhibition Inclined Cable Vibration as claimed in claim 1, is characterized in that, described damper comprises:
Mass, has an inner chamber that Open Side Down;
Upper container, is fixed in described inner chamber, is provided with length direction along vertical bridge to the polylith plate arranging in described upper container;
Lower container, has multiple damping cavity of mating described plate, in described damping cavity, is provided with damping fluid, and described plate is inserted in described damping cavity from top to bottom.
6. the external shock absorber of inhibition Inclined Cable Vibration as claimed in claim 5, is characterized in that, described mass is formed by pouring concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210514373.1A CN102943438B (en) | 2012-12-03 | 2012-12-03 | External vibration absorber capable of inhibiting vibration of stay cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210514373.1A CN102943438B (en) | 2012-12-03 | 2012-12-03 | External vibration absorber capable of inhibiting vibration of stay cable |
Publications (2)
| Publication Number | Publication Date |
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| CN102943438A CN102943438A (en) | 2013-02-27 |
| CN102943438B true CN102943438B (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210514373.1A Active CN102943438B (en) | 2012-12-03 | 2012-12-03 | External vibration absorber capable of inhibiting vibration of stay cable |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469731A (en) * | 2013-09-27 | 2013-12-25 | 无锡圣丰建筑新材料有限公司 | External damper for bridge cable |
| FR3038360B1 (en) * | 2015-07-03 | 2019-07-26 | Gaztransport Et Technigaz | DEVICE FOR FIXING PIPES IN HOUSING |
| CN105463998A (en) * | 2016-01-06 | 2016-04-06 | 柳州东方工程橡胶制品有限公司 | Mounting method for stay cable external shock absorbing device |
| CN106638976A (en) * | 2016-12-13 | 2017-05-10 | 中国能源建设集团江苏省电力设计院有限公司 | Energy consumption spherical support base |
| CN108660904B (en) * | 2018-04-09 | 2020-05-05 | 中铁大桥科学研究院有限公司 | Long sling damping vibration damper of suspension bridge |
| CN109371837B (en) * | 2018-11-02 | 2023-08-18 | 中铁大桥科学研究院有限公司 | Stay cable damper capable of testing cable force |
| CN111926681B (en) * | 2020-07-31 | 2022-03-18 | 中铁大桥局集团有限公司 | Pendulum-type tuned mass damping device and vibration damping bridge |
| CN111851254B (en) * | 2020-08-04 | 2021-11-05 | 华北水利水电大学 | Device for reducing transverse wind blowing generated shaking for bridge and implementation method thereof |
| CN112963622B (en) * | 2021-02-22 | 2022-11-15 | 中国核动力研究设计院 | High-damping vibration reduction and isolation support for nuclear power pipeline |
| CN113622304B (en) * | 2021-08-06 | 2023-04-11 | 中铁大桥局集团有限公司 | Stay cable lever amplification damping device |
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| CN102943438A (en) | 2013-02-27 |
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Address after: 103 No. 430000 Hubei Province in Qiaokou District of Wuhan city road construction Patentee after: BRIDGE SCIENCE AND TECHNOLOGY INSTITUTE CO., LTD., CHINA RAILWAY ENGINEERING GROUP Patentee after: Group Co., Ltd., Zhongtie Daqiao Bureau Patentee after: Jiangxi Province Expressway Investment Group Co., Ltd. Address before: 430000 No. 103, Jianshe Avenue, Wuhan, Hubei Patentee before: China Zhongtie Major Bridge Engineering Group Co., Ltd. Patentee before: Group Co., Ltd., Zhongtie Daqiao Bureau Patentee before: Jiangxi Province Expressway Investment Group Co., Ltd. |