Combined load shedding type sound barrier for high speed railway

Abstract

A combined load shedding type sound barrier for a high speed railway comprises an H-shaped column, upper unit plates and lower unit plates. The upper unit plates and the lower unit plates are inserted in the H-shaped column. The sound barrier is characterized in that the lower unit plates comprise a plurality of inclined inclining plates fixed on a vertical frame in an embedding mode at intervals, and a groove is formed in the middle of a cavity between opposite faces of any two inclining plates to form a silencing cavity with larger space. The upper end and the lower end of the vertical frame are connected with an upper frame and a lower frame to form a fixed frame. The fixed frame is inserted into the lower portion of the H-shaped column. The outer side of the upper frame is connected with a parabola-shaped skirt plate with an opening facing downwards, the lower portion of the skirt plate is connected with the lower frame through a plurality of transverse rods, and a sound absorbing material is bonded to the inner side of the skirt plate. Pulsating pressure exerted on the sound barrier can be reduced, service life of the sound barrier can be prolonged, and a good noise reducing effect is achieved.

Description

technical field [0001] The invention relates to a noise reduction device for railways or highways, in particular to a composite load-reducing sound barrier for high-speed railways. Background technique [0002] Under the trend of continuous development of high-speed railways, the maximum speed of high-speed trains is constantly refreshed, and the domestic commercial operating speed has reached 300km / h. When the train passes, the railway noise seriously affects the life and health of the residents around the railway. Usually, sound barriers are built on both sides of the railway track to meet the requirements of sound insulation and sound absorption. [0003] The mechanism of high-speed railway noise sources is complex and widely distributed. Under the current level of science and technology, it is difficult to control the noise from the source to make it meet the noise limit standard outside the car. The general control measure is to build sound barriers on both sides of t...

AI Technical Summary

Problems solved by technology

[0004] At present, the sound barriers installed on high-speed railways have the following problems and deficiencies: 1. The sound barriers of general high-speed railways are relatively close to the rails, and a relatively closed space will be formed when the train passes through, which will generate a large air pulsation pressure, so that the fixing bolts of the H-shaped columns Slack or even fall off, affecting the service life of the sound barrier and the safety of train operation

2. The main sound source of high-speed trains is the low- and medium-frequency wheel-rail noise at the lower part of the train, which will form multiple reflections between the car body and the sound barrier and diffract to the back of the sound barrier, thereby reducing the noise reduction effect of the sound barrier on low- and medium-frequency noise Effect, so that the overall noise reduction effect of the sound barrier on railway noise is poor, only about 5dB(A)

3. The vertical sound barrier can improve the noise reduction effect by increasing the height, but if the sound barrier is too high, it will block the sight of passengers and affect passengers' viewing of the surrounding landscape of the railway.

When the height of the sound barrier is greater than 2.7m, the sight of passengers will be completely blocked, causing passengers visual boredom, fatigue and discomfort; in order to reduce the impact of the sound barrier on the surrounding landscape of the railway, although transparent materials can be used on the upper part, the transparent The material is expensive and adds to the cost of the sound barrier

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