CN211922100U

CN211922100U - Novel damping track structure

Info

Publication number: CN211922100U
Application number: CN201922144951.7U
Authority: CN
Inventors: 冯青松; 张运来; 杨舟; 张凌; 辛伟
Original assignee: East China Jiaotong University
Current assignee: East China Jiaotong University
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-11-13
Anticipated expiration: 2029-12-04

Abstract

An object of the utility model is to provide a novel damping track structure, its characterized in that: it comprises a rubber base plate, a hydraulic supporting platform under the rail and a dynamic vibration absorbing platform under the sleeper. The utility model has the advantages of simple overall structure, make conveniently, but arrange in the track traffic such as high-speed railway, subway, can effectual reduction absorption because the track geometry is not in the same direction as, rigidity is not in the same direction as, wheel tread wear and tear the wheel rail vibration that causes arouse influence to the surrounding environment, the ground vibration that effectual reduction train arouses at the operation in-process improves the peripheral resident's in-dwelling environment of circuit line.

Description

Novel damping track structure

Technical Field

The utility model relates to a novel damping track structure belongs to the vibration and falls the technical field of making an uproar, concretely relates to track structure based on hydraulic pressure viscous damping and dynamic vibration absorber.

Background

In the vibration control measures of rail transit such as high-speed railway, subway, adopt the damping fastener to control the influence to the surrounding environment that the wheel rail vibration that causes because the track is not smooth and smooth, the technical standard that reaches is limited, can not satisfy current vibration noise control standard sometimes, can increase the vibration of surrounding environment on the contrary, can not reach the requirement of technical standard. It is to be understood that in the known vibration control measures, the vibrations are not completely eliminated, but are only attenuated by this technique until the effect of the vibrations is within the range allowed by us.

For example, the vibration response of the ground can be theoretically reduced by using a vibration damping fastener such as a double-layer nonlinear fastener, a floating rail fastener, etc. in a subway tunnel, but sometimes the ground vibration is amplified, and particularly the floating rail fastener and the double-layer nonlinear fastener can shift the ground vibration to a low frequency. The expected damping effect is often not achieved, and due to the adoption of the damping fastener, the vertical rigidity of the fastener is lower than that of a traditional fastener, so that the strength of the track is reduced, and the occurrence of grinding and wave grinding defects of the side of the steel rail is caused.

SUMMERY OF THE UTILITY MODEL

The working principle of the gap viscous damper is that when the damper is impacted by the outside, the cylinder body and the piston generate relative motion, the volume on one side of the piston is reduced, viscous damping materials are forced to flow to the side with the increased volume through the gap, and the shear flow of the damping materials generates damping force to dissipate impact energy, so that the purpose of buffering is achieved. The damper is expected to generate great resistance, can limit the displacement of the steel rail, and can absorb energy and share impact force.

The dynamic-vibration absorbing apparatus can absorb energy from the target system by its own vibration and consume it, thereby reducing the vibration of the target system.

The framework sleeper (trapezoidal sleeper) has the following advantages: 1. light in weight, save material: compared with the sleeper slab track bed, the concrete is saved by 52.6 percent per linear meter, the steel bars are saved by 69.4 percent, the weight is reduced by 68.7 percent, and compared with the hollow integral sleeper slab track bed, the concrete can be saved by 34.5 percent, the using amount of the steel bars is saved by 72.9 percent, and the weight is reduced by 22.3 percent. 2. Damping and noise reduction: the track system adopts shockproof materials as supports, and the construction period is greatly shortened. Especially, the shockproof and noise-proof effect can be realized in urban rail transit. 3. Do benefit to and accelerate the construction progress: the framed sleeper (trapezoidal sleeper) is used as a prefabricated structure, the precision and the quality can be efficiently ensured, and the work of cast-in-place concrete on a construction site is reduced, so that the construction period is shortened. 4. The durability is good, and the maintenance is convenient: the track has the advantages of being minimum in maintenance amount and repairable and high in quality. The used polyurethane plastic can be used for 50 years, and even if the polyurethane plastic needs to be replaced, the framework sleeper (trapezoidal sleeper) can be conveniently lifted by about 25 mm. If the rail part has large deformation, the rail part can reach the standard only by inserting the height adjusting sheet under the trapezoidal rail.

By utilizing the properties, a brand new track structure can be designed, a gap viscous damping principle is combined, and a novel fastener is designed, so that the fastener system is expected to generate great resistance under the condition of keeping great rigidity, not only can limit the displacement of the steel rail, but also can absorb energy and share impact force. Proceed on the wave propagation path, reducing the ground vibration response.

An object of the utility model is to provide a novel track structure can effectual reduction train the ground vibration that arouses at the operation in-process, reduces fastener bullet strip strain and stress, reduces the fastener failure rate, improves circuit peripheral resident's along the line living environment.

Particularly, an object of the utility model is to provide a novel track structure, its characterized in that: the method is characterized in that: the device comprises a rubber base plate 1, an under-rail hydraulic supporting platform 2 and an under-sleeper dynamic vibration absorption platform 3.

Further, it is characterized in that: the rubber base plate 1 is arranged among the steel rail, the hydraulic supporting platform 2 under the rail, the hydraulic supporting platform 2 and the dynamic vibration absorption platform 3 under the sleeper. Plays a role of exchanging for vibration and shock, and performs electrical insulation. Mainly comprises natural rubber, butadiene styrene rubber, neoprene, HDPE, EVA, high-density polyethylene and the like, has high elasticity, and is not easy to deform or break at various temperatures. Long service life, low maintenance and replacement cost.

Further, it is characterized in that: the under-orbit hydraulic supporting platform 2 is a cylindrical structure with the inner diameter D, the interior of the cylindrical structure is filled with 2-1 parts of dimethyl silicone oil, and the density of the under-orbit hydraulic supporting platform is rho, the dynamic viscosity mu and the volume elastic coefficient K. The diameter d of the built-in piston 2-2, and the clearance between the piston 2-2 and the inner wall is h. In the stage of installing the fastener, a preload is applied to the hydraulic support table 2 under the rail, the bulk modulus of elasticity of the oil being

V is the volume of oil above the piston, Δ V is the volume change, and Δ p is the pressure change. So that the steel rail can be well fixed.

Further, it is characterized in that: the hydraulic support platform 2 under the rail is provided with 2 groups of springs 2-3 at the upper end and the lower end, so that the piston 2-2 can generate small displacement up and down in oil, and the hydraulic support platform under the rail has the function of a hydraulic viscous damper and can consume the energy of vibration on the steel rail.

Further, it is characterized in that: the hydraulic support platform 2 under the rail is placed on the rubber base plate 1, and the rubber base plate 1 is provided with the same holes at the corresponding position of the nut at the lower end of the hydraulic support platform 2 under the rail, so that the piston 2-2 in the hydraulic support platform 2 under the rail can move up and down.

Further, it is characterized in that: the dynamic vibration absorption platform 3 under the sleeper is of a cylindrical structure, rectangular plates 3-1 and 3-2 are arranged on the upper bottom surface and the lower bottom surface, the upper bottom surface is fixed on the side edge of the sleeper through nuts along the line direction, and the lower bottom surface is directly fixed through the nuts.

Further, it is characterized in that: the upper bottom plate 3-1 of the dynamic vibration absorbing platform 3 under the sleeper is fixed with the spring 3-3 and is not fixed with the cylinder, so that the sleeper supported by the dynamic vibration absorbing platform 3 under the sleeper can form a dynamic vibration absorber with an integral structure, when the sleeper moves up and down, a part of energy is dissipated through the damping 3-4 connected between the upper bottom plate 3-1 and the lower bottom plate 3-2, and the lower bottom plate 3-2 is fixed with the cylinder and the spring 3-3. However, this structure does not satisfy the optimum design of the dynamic vibration absorber, and therefore, it is required to consume more energy and further reduce the transfer of energy to the outside, and multiple dynamic vibration absorbers 3-5 are provided in the cylinder.

Further, it is characterized in that: the multiple dynamic vibration absorber 3-5 is a multiple-degree-of-freedom multi-modal controlled dynamic vibration absorber, m, k and c are respectively the mass, rigidity and damping of the dynamic vibration absorber, mu is the mass ratio of the dynamic vibration absorber, and M, K is the mass and rigidity of the main vibration system. Wherein M is equal to μ M,

to determine the dynamic vibration absorber damping ratio in an optimum state.

Further, it is characterized in that: the frame type sleeper (trapezoidal sleeper) is formed by connecting all sleepers into a whole.

Drawings

Fig. 1 is an overall structure diagram of the novel track structure of the present invention.

Fig. 2 is a schematic view of the novel track structure (vertical train traveling direction) of the present invention.

Fig. 3 is a schematic view of the novel track structure (along the direction of train travel) of the present invention.

Fig. 4 is a schematic view of the under-rail hydraulic support table 2 of fig. 2.

Fig. 5 is a schematic view of the under-pillow dynamic-vibration absorbing platform 3 of fig. 2.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The first embodiment is as follows: with reference to fig. 1-5, the present embodiment of the utility model aims to provide a novel periodic fastener structure based on hydraulic viscous damping, take ballastless track as an example, its characterized in that: the device comprises a rubber base plate 1, an under-rail hydraulic supporting platform 2 and an under-sleeper dynamic vibration absorption platform 3.

Preferably, the rubber pad 1 is interposed between the rail and the under-rail hydraulic support table 2, the hydraulic support table 2 and the under-sleeper dynamic-vibration absorbing platform 3. Plays a role of exchanging for vibration and shock, and performs electrical insulation. Mainly comprises natural rubber, butadiene styrene rubber, neoprene, HDPE, EVA, high-density polyethylene and the like, has high elasticity, and is not easy to deform or break at various temperatures. Long service life, low maintenance and replacement cost.

Preferably, the hydraulic support table 2 is of a cylindrical construction with an internal diameter D. The interior is filled with 2-1 parts of dimethyl silicone oil, and the density is rho, the dynamic viscosity is mu, and the volume elastic coefficient is K. The diameter d of the built-in piston 2-2, and the clearance between the piston 2-2 and the inner wall is h. In the stage of installing the fastener, a preload is applied to the hydraulic support table 2 under the rail, the bulk modulus of elasticity of the oil being

Preferably, the hydraulic support platform 2 under the rail is provided with 2 groups of springs 2-3 at the upper end and the lower end, so that the piston 2-2 can generate small displacement up and down in oil, and the energy of vibration on the steel rail can be consumed by considering that the hydraulic support platform under the rail has the function of a hydraulic viscous damper.

Preferably, the hydraulic support platform 2 under the rail is placed on the rubber base plate 1, and the rubber base plate 1 is provided with the same hole at the position corresponding to the nut at the lower end of the hydraulic support platform 2 under the rail, so that the piston 2-2 in the hydraulic support platform 2 under the rail can move up and down.

Preferably, the dynamic vibration absorption platform 3 under the sleeper is of a cylindrical structure, the upper bottom surface and the lower bottom surface are rectangular plates 3-1 and 3-2, the upper bottom surface is fixed on the side edge of the sleeper through nuts along the line direction, and the lower bottom surface is directly fixed through the nuts. A damper 3-4 is arranged between the rectangular plates 3-1 and 3-2.

Preferably, the upper bottom plate 3-1 of the under-pillow dynamic vibration absorbing platform 3 is fixed with the spring 3-3 and is not fixed with the cylinder, so that a sleeper supported by the under-pillow dynamic vibration absorbing platform 3 can form a dynamic vibration absorber with an integral structure, when the sleeper moves up and down, a part of energy is dissipated through the damping 3-4 connected between the upper bottom plate 3-1 and the lower bottom plate 3-2, and the lower bottom plate 3-2 is fixed with the cylinder and the spring 3-3. More preferably, in order to be able to consume more energy and further reduce the transfer of energy to the outside, multiple dynamic vibration absorbers 3-5 are provided in the cylinder.

Preferably, the multiple dynamic vibration absorber 3-5 is a multiple degree of freedom multi-modal controlled dynamic vibration absorber, m, k, c are the mass, stiffness and damping of the dynamic vibration absorber, μ is the mass ratio of the dynamic vibration absorber, and M, K is the mass and stiffness of the main vibration system, respectively. X is the damping coefficient, X_stCritical damping coefficient.

Wherein M is equal to μ M,

to determine the dynamic vibration absorber damping ratio in an optimum state.

Preferably, the frame-type sleepers (trapezoidal sleepers) are connected to form a whole.

It should be noted that, the above embodiment is also suitable for a ballastless track form, and when the main relation frequency bands are different, only a slight adjustment needs to be made on the dynamic vibration absorbing platform under the sleeper according to the requirement.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a novel damping track structure which characterized in that: the device comprises a rubber base plate, an under-rail hydraulic supporting platform and an under-sleeper dynamic vibration absorption platform; wherein the rubber pad is arranged between the steel rail and the hydraulic supporting table under the steel rail and between the steel rail and the hydraulic supporting table under the steel railUnder-railBetween the hydraulic supporting platform and the dynamic vibration absorbing platform under the pillow.

2. The novel vibration damping track structure as claimed in claim 1, wherein: the hydraulic support platform under the rail is a cylindrical structure with the inner diameter D, the interior of the cylindrical structure is filled with dimethyl silicone oil, and the gap between the piston and the inner wall is h.

3. The novel vibration damping track structure as claimed in claim 1, wherein: the hydraulic support platform under the rail is provided with group springs at the upper end and the lower end, so that the piston can generate small displacement up and down in oil.

4. The novel vibration damping track structure as claimed in claim 1, wherein: the hydraulic supporting platform under the rail is placed on the rubber base plate, and the rubber base plate is provided with the same holes at the corresponding position of the nut at the lower end of the hydraulic supporting platform under the rail, so that the piston in the hydraulic supporting platform under the rail can move up and down.

5. The novel vibration damping track structure as claimed in claim 1, wherein: the dynamic vibration absorption platform under the sleeper is of a cylindrical structure, the upper bottom surface and the lower bottom surface are rectangular plates, the upper bottom surface is fixed on the side edge of the sleeper through nuts along the line direction, and the lower bottom surface is directly fixed through the nuts.

6. The novel vibration damping track structure as claimed in claim 1, wherein: the upper bottom plate of the dynamic vibration absorption platform under the sleeper is fixed with the spring and is not fixed with the cylinder, so that the sleeper supported by the dynamic vibration absorption platform under the sleeper and the integral structure can form a dynamic vibration absorber, when the sleeper generates displacement up and down, a part of energy is dissipated through the upper bottom plate, the lower bottom plate and the cylinder and the spring are fixed.