Strip interface constrained damping ballast bed for subway vibration and noise reduction and preparation method thereof

A technology for vibration reduction, noise reduction, and restraint damping. It is applied to roads, tracks, ballast layers, etc. It can solve the problems of insignificant vibration reduction effect, slippage of track bed structure, and reduced vibration reduction effect, and achieve good resistance to train impact and performance. Fatigue resistance, prevention of relative slip and wavy wear, effect of increasing impact resistance and fatigue resistance

Active Publication Date: 2018-02-06
QINGDAO TECHNOLOGICAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Strip interface constrained damping ballast bed for subway vibration and noise reduction and preparation method thereof
  • Strip interface constrained damping ballast bed for subway vibration and noise reduction and preparation method thereof
  • Strip interface constrained damping ballast bed for subway vibration and noise reduction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The strip interface constrained damping track bed for subway vibration and noise reduction includes a concrete base layer, a constrained layer and an intermediate layer between them. The track bed has a length of 12-15m and a width of 3-5m. The concrete base layer, the constrained layer and the middle layer are all strip-shaped, and the strips of two adjacent layers match each other; the middle layer is a multi-layer constrained damping layer, and the middle layer is composed of damping material layers arranged in sequence I. Composition of hard interlayer and damping material layer II. 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 constraining layer. The damping material layer is a polyurethane-urea damping material. The hard interlayer is an epoxy resin layer with a Shore D hardness of 65.

[0031] Wherein, the strip-shaped interface is composed of a plurality...

Embodiment 2

[0040] The difference from Example 1 is that the damping track bed is constrained by the strip interface of subway vibration and noise reduction, and the hard interlayer is an epoxy resin layer with a Shore D hardness of 64. The protrusion height of the strip is 100 mm, the width of the strip is 360 mm, and the width between two adjacent strips is 380 mm. Wherein, the thickness of the damping material layer I, the hard interlayer and the damping material layer II are all 1.6 mm; the thickness of the concrete base layer and the constraining layer are both 0.25 m. The hard interlayer and the damping material layer I and the hard interlayer and the damping material layer II are provided with an emery layer embedded on the surfaces of the two, and the quantity of the emery is 4.0kg / m 2 , The particle size of the emery is 1.6mm.

[0041] The difference from Example 1 is that the preparation method of the strip interface constrained damping track bed for subway vibration and noise redu...

Embodiment 3

[0050] The difference from Example 1 is that the damping track bed is constrained by the strip interface of subway vibration and noise reduction, and the hard interlayer is an epoxy resin layer with a Shore D hardness of 66. The height of the protrusion of the strip is 110 mm, the width of the strip is 400 mm, and the width between two adjacent strips is 300 mm. Wherein, the thickness of the damping material layer I, the hard interlayer and the damping material layer II are all 2.5 mm; the thickness of the concrete base layer and the constraining layer are both 0.22 m. The hard interlayer and the damping material layer I and the hard interlayer and the damping material layer II are provided with an emery layer embedded on the surfaces of the two, and the quantity of the emery is 3.5kg / m 2 , The particle size of the emery is 1.8mm.

[0051] The difference from Example 1 is that the preparation method of the strip interface constrained damping track bed for subway vibration and noi...

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PUM

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Abstract

The invention relates to a strip-shaped interface constraint damping track bed for subway vibration and noise reduction. The strip-shaped interface constraint damping track bed includes a concrete base layer, a constraint layer and an intermediate layer therebetween; the concrete base layer, the constraint layer and the intermediate layer are all strip-shaped interfaces; the strip-shaped interface is composed of a plurality of parallelly-arranged protruding strip units, wherein strips in two adjacent layers are matched with each other; the intermediate layer is a multi-layer constraint damping layer; and the intermediate layer is composed of a damping material layer I, a hard interlayer and a damping material layer II which are arranged sequentially; the damping material layer I is located at one side which is adjacent to the concrete base layer; and the damping material layer II is located at one side which is adjacent to the constraint layer. According to the strip-shaped interface constraint damping track bed for subway vibration and noise reduction of the invention, the track bed constraint interfaces are designed into strip-shaped structures, and therefore, on the one hand, the hidden hazard of the relative slide of the track bed can be eliminated, and on the other hand, shear area is increased, and therefore, the non-linear characteristic of damping materials can be fully utilized; and by means of the shear energy consumption of the damping materials, a loss factor can be increased by 0.3 to 0.5, and therefore, a vibration effect is also significantly improved.

Description

Technical field [0001] The invention belongs to the field of architecture, and relates to a track bed vibration and noise reduction structure and a preparation method thereof, in particular to a strip interface combined structure that is beneficial to vibration and noise reduction. Background technique [0002] In today's society, all kinds of vibrations and noises emerge in an endless stream and are inevitable. However, the long-term effects of this environment not only affect people's physical and mental health, but also cause fatigue damage to structural equipment due to long-term vibration, and decreased sensitivity of precision instruments. Therefore, controlling vibration and reducing noise has become an urgent issue to be solved. As an important part of urban rail transit, the subway has played an increasingly important role in people's work and life. In order to improve ride comfort and increase the service life of rails and vehicles, more and more new technologies have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B1/00E01B29/00E01B19/00
CPCE01B1/002E01B19/003E01B29/005
Inventor 黄微波李栋许圣鸣冯超梁龙强李华阳常瑞景张锐
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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