Floating slab ballast bed with weak correlation between frequency and load

Abstract

The invention belongs to the technical field of vibration and noise reduction of rail transit, A floating slab ballast bed for isolating vibrations generated during operation of a rail vehicle is disclosed, comprising a floating plate and an elastic vibration isolation device, the elastic vibration isolation device is placed in an installation reserved space or a coupling sleeve arranged on the floating plate, The elastic vibration isolation device includes an upper housing, a lower housing, and an elastic element disposed between the upper housing and the lower housing, the elastic element including a static support spring and a combined support spring. As that system frequency of the float slab ballast bed with weak correlation between the frequency and the load does not change obviouslywith the change of the load, the correlation between the system frequency and the load is weak, and the float slab ballast bed has the characteristics of simple structure, strong adaptability to dynamic load variation, good vibration isolation performance and the like, and can be widely applied to vibration isolation engineering of various rail transit.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction and noise reduction for rail transit, and relates to a track bed, in particular to a floating slab track bed used for isolating vibration generated during the operation of rail vehicles. Background technique [0002] Vibration isolation and damping have always been the core issues of urban rail transit and construction. Floating ballast bed technology is widely used to solve vibration isolation and damping problems. Among them, the floating ballast bed system based on the steel spring vibration isolation device has been recognized in the industry due to its good vibration isolation effect, long service life, and stable vibration isolation effect, and has been widely used in rail transit lines in many countries and cities middle. However, the existing steel spring vibration isolation devices are all designed to provide linear elastic bearing capacity. For safety considerations, their ...

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Problems solved by technology

However, the existing steel spring vibration isolation devices are all designed to provide linear elastic bearing capacity. For safety considerations, their vertical stiffness is relatively large, and the amount of compression during work is small. According to "CJJ-T191-2012 Floating Plate Track "Technical Specifications" requires that "the maximum vertical displacement of the floating plate under the rated load of the train should not exceed 3mm", therefore, the compression of the steel spring vibration isolation device under working conditions generally does not exceed 3mm

The problems caused by this include: (1) The spring stiffness is large, the compression amount is small during operation, and the natural frequency of the system is high, which cannot cope with the system caused by the huge change in the load of the local floating plate when the rail vehicle enters and leaves. The natural frequency changes, and it is difficult to fully adapt to the vibration control requirements under the changing dynamic load conditions when the rail vehicle passes by. The spring must be compressed to achieve a good vibration and noise reduction function when the dynamic load reaches a certain value. The section can achieve a good vibration isolation effect, the vibration isolation effect of the insufficiently loaded section is limited, and the overall vibration isolation effect is limited; (2) Under non-working conditions, when only the floating plate is supported, due to the small load, the steel spring vibration isolation The static compression of the device is too small, sometimes even less than 1mm, which makes it difficult to adjust the height and level of the floating ballast bed, and the construction efficiency is low

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