Mesh interface constrained damping ballast bed for vibration and noise reduction of subway and its preparation method

Abstract

The invention discloses a grid interface constraint damping ballast bed for reducing vibration and noise for subways. The grid interface constraint damping ballast bed comprises a concrete base layer, a constraint layer and an intermediate layer. The intermediate layer is positioned between the concrete base layer and the constraint layer. The concrete base layer, the constraint layer and the intermediate layer are grid-shaped interfaces, the grid-shaped interfaces comprise a plurality of protruded grid units which are orderly arranged, and the grid units of every two adjacent layers are matched with one another; the intermediate layer is a multilayer constraint damping layer and comprises a damping material layer I, a hard sandwich layer and a damping material layer II which are sequentially arranged. The damping material layer I is positioned close to a side of the concrete base layer, and the damping material layer II is positioned close to a side of the constraint layer. The grid interface constraint damping ballast bed has the advantages that the grid-shaped constraint interfaces of the grid interface constraint damping ballast bed are designed, the problem of relative slipping hazards of ballast beds can be solved, the shear areas can be enlarged, accordingly, nonlinear characteristics of damping materials can be sufficiently played, loss factors can be increased by 0.3-0.5 by the aid of shear energy consumption of the damping materials, and vibration reduction effects can be obviously improved.

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 grid 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 tech...

AI Technical Summary

Problems solved by technology

However, these technologies have the following defects: (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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