Track slab and track slab damping system with periodic structural features

Abstract

The invention provides a track board with periodic structure characteristics. The track board is formed by overlapping multiple layers of periodic sub-structures; the adjacent periodic sub-structures are made of different constituent materials, the thickness sizes of all layers of periodic sub-structures are determined according to the height of a track and the damping effect requirement, and damping is achieved based on an elastic wave band gap principle. The thickness sizes of all layers of periodic sub-structures are equal. The thickness sizes of all layers of periodic sub-structures are consistent with focused vibration wavelengths so that the damping effect can be improved, and damping is achieved based on the elastic wave band gap principle. A track board damping system with the periodic structure characteristics comprises the track board, buckle systems, steel rails, a base, a CAM mortar layer and a boss; the steel rails are fixed to the track board through the buckle systems; and the track board is arranged on the base through the CAM mortar layer and is continuously laid in the line extension direction. The track board damping system can be used for urban rail transit, high-speed railways, heavy haul railways and common railways. Damping and noise reduction control over urban rail transit, the high-speed railways, the heavy haul railways and the common railways is facilitated, and meanwhile the beneficial effects of being simple in structural style and convenient and flexible to construct and maintain are achieved.

Description

technical field [0001] The invention belongs to the technical field of rail transportation, and relates to a railway track structure, in particular to a vibration-reducing ballastless track structure suitable for urban rail transportation, high-speed railways, heavy-duty railways and ordinary railways. Background technique [0002] With the rapid development of rail transit, the vibration problem caused by it has become increasingly prominent. The track structure is not only a vibration source, but also one of the important transmission paths, and its vibration damping ability will directly affect the final vibration response of the surrounding environment of rail transit. [0003] The existing track structure vibration reduction measures mainly focus on reducing component stiffness and increasing component damping. However, in practical applications, it will have a certain impact on the safety and comfort of train operation. As for the vibration reduction measures of faste...

AI Technical Summary

Problems solved by technology

[0003] The existing track structure vibration reduction measures mainly focus on reducing component stiffness and increasing component damping. However, in practical applications, it will have a certain impact on the safety and comfort of train operation.

As for the vibration reduction measures of fasteners, the data show that the application of track damper fasteners and pioneer fasteners in my country's subways is not ideal, which induces serious rail corrugation, and the intensification of corrugation will cause high wheel and rail frequency vibration, causing the resonance of the vehicle

The reason is that when the stiffness of the fastener is reduced, most of the vibration energy is isolated from the lower foundation, and the vibration energy is concentrated on the rail, which causes greater damage to the rail

And if the foundation under the rail is soft, the vibration displacement of the rail can even reach 4-5mm, seriously affecting the safe operation of the upper vehicle

For the vibration reduction of the floating slab track, it has better vibration reduction performance for the frequency band above the natural frequency. However, when the frequency of the load is lower than the natural frequency of the floating slab structure, the vibration reduction performance of the floating slab is not ideal. Even the vibration will be amplified

In addition, the stiffness of the foundation under the slab is reduced. On the one hand, the vertical dynamic displacement of the rail surface is increased, and on the other hand, the vertical displacement difference between adjacent track slabs is increased, causing the track surface to be uneven. The combination of the two can easily cause the upper train to derail. , affecting the safety of train operation

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