Sawtooth interface constraint damping track bed applied to vibration and noise reduction of subway

Abstract

A sawtooth interface constraint damping track bed applied to vibration and noise reduction of a subway comprises a concrete base layer, a constraint layer and a middle layer located between the layers, wherein the concrete base layer, the constraint layer and the middle layer are shaped like sawteeth, and sawteeth of the two adjacent layers are matched; the middle layer is a multi-layer constraint damping layer, and the middle layer is composed of a damping material layer I, a hard interlayer and a damping material layer II which are successively arranged; the damping material layer I is located on the side close to the concrete base layer, and the damping material layer II is located on the side close to the constraint layer; and the damping material layer is made of a polyurethane-urea damping material. According to the invention, a track bed constraint interface is designed into a sawtooth shape. Hence, on one side, hidden dangers in relative slippage of the track bed are avoided; and on the other side, the specific area of the structure is increased, namely the shear area is increased, so that non-linear characteristics of the damping material could be manifested better. Shear energy consumption of the damping material is applied, and the loss factor increases by 0.3-0.5, so that vibration reduction effects are also improved obviously.

Description

technical field [0001] The invention belongs to the field of construction, and relates to a ballast bed vibration and noise reduction structure and a preparation method thereof, in particular to a sawtooth interface combination structure which is beneficial to vibration and noise reduction. Background technique [0002] In today's society, all kinds of vibrations and noises emerge in endlessly and cannot be avoided. However, the long-term effect of this environment not only affects people's physical and mental health, but also leads to fatigue damage of structural equipment due to long-term vibration, and a decrease in the sensitivity of precision instruments. Therefore, controlling vibration and reducing noise has become an urgent problem to be solved. As an important part of urban rail transit, subway has played an increasingly important role in people's work and life. In order to improve ride comfort and improve the service life of rails and vehicles, more and more new ...

AI Technical Summary

Problems solved by technology

However, these technologies have the following disadvantages: (1) the loss factor is only about 0.05 to 0.2, and the vibration reduction effect is not obvious; (2) the service life is short; because these devices use materials such as springs and rubber, the volume is relatively small compared to spray-type damping materials. If it is relatively large, after several years of use, the vibration damping effect will be significantly reduced due to the continuous impact of the train and the aging of materials; (3) and the most important point: these technologies will cause slippage and wavy structure of the ballast bed structure. Abrasion, this phenomenon will in turn increase the vibration of the structure, which will have a greater impact on passengers and residents of surrounding buildings, which will cause the subway department to receive complaints from the masses; The track bed caused immeasurable losses to the project

However, there is a huge potential safety hazard in this method, that is, as time goes by, the long-term impact of the train will cause relative slippage of the ballast bed

[0005] At present, epoxy resin is mainly used in the fields of coating protection, adhesives, electronic and electrical materials, engineering plastics, composite materials, civil engineering materials, etc. It has not been applied to the multi-layer constrained damping ballast bed structure for vibration and noise reduction.

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