CN103161125A

CN103161125A - Pod rain-line type damper suitable for stay cable

Info

Publication number: CN103161125A
Application number: CN2013100727628A
Authority: CN
Inventors: 淡丹辉; 徐斌; 巩煚鑫; 孙利民
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2013-03-07
Filing date: 2013-03-07
Publication date: 2013-06-19
Anticipated expiration: 2033-03-07
Also published as: CN103161125B

Abstract

The invention discloses a pod rain-line type damper suitable for a stay cable. The damper is wound on a stay cable tightly and closely and comprises a protective sleeve, a metal woven layer, cabin partition boards and particles enclosed in cabins. A rope-type cavity is formed by the metal woven layer. The cabin partition boards divide the cavity into a plurality of small cabins, and particles with different particle diameters are evenly distributed in each small cabin. The protective sleeve is coated outside the entire rope-type cavity. The pod rain-line type damper suitable for the stay cable has the advantages that vibration energy of the stay cable can be consumed through the forms such as motions of the particles in the pod rain-line type damper, collisions and frictions between the particles and collisions and frictions between the particles and cabin walls, so that the aim of vibration attenuation of the stay cable is achieved. Due to the fact that the pod rain-line type damper is wound on the stay cable tightly and closely, the aim of damaging of rain lines on the stay cable is achieved. Wind and rain vibrations of the stay cable can be reduced effectively. At the same time, internal damping of the stay cable is increased, so that vibrations in other forms are reduced.

Description

Be applicable to the beanpod rain line style damper of suspension cable

Technical field

The present invention relates to bridge system technical field, particularly a kind of beanpod rain line style damper that is applicable to suspension cable.

Background technology

Along with the increase across the footpath, large span stayed-cable bridge is more and more gentleer, makes cable stayed bridge be easy to be subject to the excitation of various extraneous factors and vibration-generating.And suspension cable is little because of rigidity especially, and quality is light, and the characteristics that damping is low are easy to vibration-generating.And along with the continuous increase of cable stayed bridge across the footpath, drag-line is also more and more longer, and the vibration problem of drag-line also becomes increasingly conspicuous.Suspension cable is by the unstable wind-induced vibration that causes of air force and also become increasingly conspicuous by the parametric vibration problem that structural interaction causes.Wherein the rain wind induced vibration problem of drag-line is that in present known inhaul cable vibration, amplitude is maximum, a kind of vibration that disaster is the most serious.When drag-line generation rain wind induced vibration, the waterline that the drag-line upper and lower surface respectively has rainwater to form flows downward along the drag-line that tilts, and along with the vibration of drag-line in drag-line surface concussion.

For fear of the vibration of the suspension cable damage to cable stayed bridge, the inhaul cable vibration method of now generally taking mainly contains following three kinds: the dynamic characteristics method of the pneumatic control method of drag-line, the damping vibration attenuation method of drag-line and drag-line.The pneumatic control method of drag-line is the cross sectional shape by changing drag-line and drag-line is carried out specially treated improve the aerodynamic characteristic of drag-line under the wind and rain effect mainly.The damping vibration attenuation method of drag-line is a kind ofly to improve the oscillation damping method of stayed structure damping by additional damping device on drag-line.The dynamic characteristics method of drag-line is to adopt lazy halyard that different drag-lines is connect, and long rope is changed into tackline, changes the dynamic characteristics of drag-line, thereby controls the wind-induced vibration of drag-line.

Use more several dampers from present engineering, the damping value that the high-damping rubber damper can provide is limited, and may not reach for low order mode the damping value that optimal design requires; The shortcoming of the maximum of hydraulic damper and sticky shearing material damping device is that the temperature compliance of its performance is large, and the durability of oil consumption material neither be very satisfactory; Although frictional property damper not temperature influence is easily regulated, during little amplitude, damping can not be worked, and may be unfavorable for the fatigue damage of drag-line, and the discrete feature of its material also can cause the unstable fixed of damping capacity; MR damper is the adjustable parameter damper made from intellectual material, is that a kind of new technology has lot of advantages, but its price is relatively also more expensive etc.

Damper in above introduction, no matter take the damper of which kind of form, the position that it is exactly damper that there is a common effect in the capital is closer from anchor-hold point, although can effectively improve the destruction that the anchor point place causes because of wind-induced vibration, but still undesirable to slowing down of amplitude in the middle part of drag-line, particularly the long rope of large span stayed-cable bridge is all the more so, therefore in the cable stayed bridge of large span, always will rely on several measures considers, from bridge angle attractive in appearance, it is also inaesthetic that the above damper is installed, and need to solve in conjunction with the drag-line aerodynamic Measures.

Summary of the invention

Technical problem to be solved by this invention is that a kind of beanpod rain line style damper that is applicable to suspension cable will be provided, and can bring into play the advantage of aerodynamic Measures, the damping that can improve again suspension cable.

In order to solve above technical problem; the invention provides a kind of beanpod rain line style damper that is applicable to suspension cable; this damper closely is wrapped on suspension cable; comprise protective sleeve, wire sheathing, cabin dividing plate and be enclosed in particle in the cabin; the rope type cavity that is consisted of by wire sheathing; the cabin dividing plate is divided into several cuddies with cavity, and the particle of the different-grain diameter that distributing equably in each cuddy is at the outside of whole rope type cavity parcel protective sleeve.

Described rope type cavity is the closed circle structure, to reduce the resistance of drag-line.The material of described wire sheathing is metal hose, as stainless steel, copper etc.In order to strengthen its energy absorption performance, can add one deck abrasive rubber in metal hose.

The material of described cabin dividing plate is metal hose, or is elastomeric material.The number of cabin dividing plate depending on required cabin length, in order to make the performance of beanpod rain line style damper effect good, cabin length is unsuitable long.And the cabin dividing plate can not allow the particle in the cabin pass through, and guarantees the original distribution of particle.

Being shaped as of described particle is irregular, and grain diameter also should be divided into several grades, and the quantity of particle accounts for the 50%-90% of each cuddy.

Described protective sleeve adopts wear-resisting, corrosion-resistant material.

Superior effect of the present invention is:

1) adopt the thought that increases the suspension cable internal damping, the forms such as the collision by the collision between the endocorpuscular motion of beanpod rain line style damper, particle and friction, particle and cabin wall and friction consume the energy of inhaul cable vibration, play the purpose of pulling cable damping, compare with existing damper, it has technology simple, the advantages such as low price;

2) the present invention closely is wrapped on drag-line, plays the purpose of destroying drag-line rain line, has effectively reduced the vibration of drag-line wind and rain, increases simultaneously the drag-line internal damping, has reduced other forms of vibration.Comparing with existing damper, is the stack of multiple damping, and more single unlike existing damper, is conducive to like this save the space;

3) from the Bridge Landscape angle, the present invention locks just as a fine rule is wrapped in, and there is no much impacts to bridge is attractive in appearance, and existing damper is larger on the impact of Bridge Landscape;

4) existing damper needs mounting bracket, has limited the setting height(from bottom) of damper, has weakened the effectiveness in vibration suppression of damper.The present invention does not need support, can be arranged on whole height, and is more favourable to the vibration damping of drag-line;

5) simple structure of the present invention can not produce some drawbacks of existing damper, the Leakage of hydraulic damper for example, the idle problem of the little amplitude of frcition damper.

Description of drawings

Fig. 1 is the cross-sectional drawing of beanpod rain line style damper of the present invention;

Fig. 2 is the skiagraph of beanpod rain line style damper of the present invention;

Fig. 3 is that single beanpod rain line style damper is applied to the elevation on suspension cable;

Fig. 4 is that two beanpod rain line style dampers are applied to the elevation on suspension cable;

The number in the figure explanation

1-protective sleeve; 2-wire sheathing;

3-cabin dividing plate; 4-particle;

5-beanpod type damper; 6-suspension cable.

The specific embodiment

See also shown in accompanying drawing, the invention will be further described.

As depicted in figs. 1 and 2; the invention provides a kind of beanpod rain line style damper that is applicable to suspension cable; this damper closely is wrapped on suspension cable 6; comprise protective sleeve 1, wire sheathing 2, cabin dividing plate 3 and be enclosed in particle 4 in the cabin; wire sheathing 2 consists of rope type cavity; cabin dividing plate 3 is divided into several cuddies with cavity, the particle 4 of the different-grain diameter that distributing equably in each cuddy, parcel protective sleeve 1 outside whole cavity.

Wire sheathing 2 adopts material soft, wear-resisting and that energy-absorbing is good, is beneficial to crooked the winding, can contact with suspension cable 6 closely, and its diameter is unsuitable excessive, and the diameter of vibration damping suspension cable 6 is determined as required.Whole wire sheathing 2 is closed circle structures,

Cabin dividing plate 3 can adopt and wire sheathing 2, and perhaps the material consistent with elastomeric material made, the number of cabin dividing plate 3 depending on required cabin length, and in order to make the performance of beanpod rain line style damper effect good, cabin length is unsuitable long.And cabin dividing plate 3 can not allow the particle in the cabin pass through, and guarantees the original distribution of particle.

Cabin endoparticle 4 needs to adopt irregular particle shape, amounts of particles accounts for the 50%-90% of each cuddy, when if known drag-line has the significant vibration shape, can allow particle uneven distribution in whole system, that is to say to put a little particles near the cuddy the vibration shape peak value that needs are controlled more.Consider the distribution proportion of grain diameter according to the characteristic of inhaul cable vibration, the particle of different-grain diameter is can make movement of particles in order to guarantee under the difference vibration, play the energy dissipating effect, guarantee to disperse and be unlikely to harden in order to make the particle in the cabin, can mix some desiccant in the middle of particle.The material of particle should be material wear-resisting, that density is large, roughness is large, such as tungsten carbide, iron filings, steel ball etc.

Outermost protective sleeve 1 be mainly for protect beanpod rain line style damper can corrosion, the problem such as aging, its material requirements is soft, wear-resisting, corrosion-resistant, ageing-resistant etc.Can select the materials identical with the suspension cable sheath such as PE flexible pipe, HDPE flexible pipe, this can guarantee that also beanpod rain line style damper is firm and convenient when mounted.

The diameter of beanpod rain line style damper is selected to determine according to the diameter of suspension cable 6, after determining beanpod rain line style damper diameter, determine the thickness of each deck, principle is to make the diameter of cavity larger as far as possible, be conducive to like this store more particle 4, damping is better significantly.

As shown in Figure 3; be a beanpod rain line style damper 5 and a suspension cable 6 that needs vibration damping; beanpod rain line style damper 5 is wrapped on whole skew cables 6 by a constant pitch by glue special; when suspension cable 6 vibration-generating; particle in beanpod rain line style damper 5 can move thereupon, and the motion of the friction between the collision between particle and particle, particle and main system and the quality of device own etc. can consume the energy of inhaul cable vibration.When Sometimes When It Rains, because beanpod rain line style damper 5 is spirally wound on suspension cable 6, makes on suspension cable 6 and can not form waterline, destroyed thus the condition that produces rain wind induced vibration, avoided the unfavorable vibration under this situation.

When a beanpod type damper can not satisfy requiring of vibration damping, also two identical beanpod rain line style dampers 5 can be installed on same skew cables 6.As shown in Figure 4, comprise two identical beanpod rain line style dampers 5, also have a suspension cable 6 for the treatment of vibration damping, working mechanism when single damper is installed.Specific practice is to allow two beanpod rain line style damper 5 initial positions differ 180 ° be wrapped on whole skew cables 6 by a constant pitch by glue special by identical direction and pitch.

Claims

1. beanpod rain line style damper that is applicable to suspension cable; it is characterized in that: this damper closely is wrapped on suspension cable; comprise protective sleeve, wire sheathing, cabin dividing plate and be enclosed in particle in the cabin; the rope type cavity that is consisted of by wire sheathing; the cabin dividing plate is divided into several cuddies with cavity; distributing equably in each cuddy particle of different-grain diameter is at the outside of whole rope type cavity parcel protective sleeve.

2. the beanpod rain line style damper that is applicable to suspension cable according to claim 1, it is characterized in that: described rope type cavity is the closed circle structure.

3. the beanpod rain line style damper that is applicable to suspension cable according to claim 1, it is characterized in that: the material of described wire sheathing is metal hose.

4. the beanpod rain line style damper that is applicable to suspension cable according to claim 3, is characterized in that: add one deck abrasive rubber in described metal hose.

5. the beanpod rain line style damper that is applicable to suspension cable according to claim 1, it is characterized in that: the material of described cabin dividing plate is metal hose, or is elastomeric material.

6. the beanpod rain line style damper that is applicable to suspension cable according to claim 1, it is characterized in that: being shaped as of described particle is irregular, and the quantity of particle accounts for the 50%-90% of each cuddy.

7. the beanpod rain line style damper that is applicable to suspension cable according to claim 1, is characterized in that: wear-resisting, the corrosion-resistant material of described protective sleeve employing.