Urban rail transit shock absorption type floating slab rail system

Abstract

An urban rail transit shock absorption type floating slab rail system comprises a floating plate (1), a tunnel foundation (5) and a steel rail (2). The steel rail (2) is fixed to the floating plate (1) through fasteners (3). The floating plate (1) is arranged on the tunnel foundation (5) through a vibration isolator (4). The tunnel foundation is arranged in a tunnel (8). The urban rail transit shock absorption type floating slab rail system further comprises a shock absorption device arranged on the floating plate (1), The shock absorption device is composed of shock absorption blocks (6) or shock absorption strips (10) and an elastic damping element (7) and is arranged on the floating plate (1) discretely. Some lines of the shock absorption blocks (6) are arranged within the width range of the floating plate (1), and the other shock absorption blocks (6) are arranged within the length range of the floating plate (1). The urban rail transit shock absorption type floating slab rail system is simple in structure and convenient and feasible to assemble and detach; the low-frequency-band vibration isolation effect of the floating plate is improved, the disadvantageous influence that vibration is amplified when the frequency of the floating plate is close to the inherent frequency is restrained, and the urban rail transit shock absorption and noise reduction control and the social harmonious development promotion are facilitated.

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-absorbing floating slab rail system suitable for urban rail transportation. Background technique [0002] Floating slab damping track, which completely isolates the upper structure of the track structure from the foundation through elastic bodies (rubber or spiral steel springs, etc.), making it in a suspended state, using the entire ballast bed to perform inertial motion on the elastic body to isolate and attenuate the train Vibration generated by operation. Since the floating slab track was first applied in Germany in 1965, it has been widely used to control the vibration caused by the operation of subway trains due to its excellent vibration damping performance. At present, a large number of floating slab track structures have been used in subway construction in many cities at home and abroad, and good results ...

AI Technical Summary

Problems solved by technology

[0003] The floating slab track structure has good vibration isolation performance in the frequency band above its natural frequency. However, when the frequency of the load is lower than the natural frequency of the floating slab structure, the vibration isolation performance of the floating slab is not ideal, and even the vibration will magnified

In addition, low-frequency vibrations have long propagation distances, slow attenuation, and are easy to resonate with the natural frequencies of human organs and ground structures, causing serious harm to the physical and mental health of residents and the safety of structural buildings.

The usual method is to reduce the natural frequency of the track structure to improve the buffering effect of the track structure on low-frequency vibration components. The common method is to increase the mass of the floating slab structure itself, or reduce the supporting stiffness of the floating slab, but these two methods are due to the subway Factors such as building boundaries have certain limitations, so it is necessary to explore the above-mentioned devices and methods to control the low-frequency vibration of the track structure without changing the natural frequency of the floating slab structure

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