Adjustable automatic load shedding sound barrier

Abstract

The invention discloses an adjustable automatic load-reduction sound barrier. The load-reduction sound barrier comprises an upper-layer plate, a middle-layer plate, a lower-layer plate, a base and stand columns. The adjustable automatic load-reduction sound barrier has the advantages that on the basis of theoretical analysis and numerical simulation calculation, noise mainly transmitted by a pantograph and a wheel rail can be straightly blocked and absorbed through a seamless structure of the upper-layer plate and the lower-layer plate; the spreading direction and spreading distance of sound waves can be effectively changed while the middle-layer plate can guarantee that train wind and natural wind pass freely, and the aim of lowering noise is achieved; mounting is convenient, and economical efficiency is achieved; the sound barrier is of an assembled structure, flow-process construction can be achieved, work efficiency can be improved, construction time can be shortened, and a large amount of manpower and cost can be saved; the cost is saved; the structure is durable; the negative influence of wind loads on the sound barrier is eliminated through the sound barrier, fatigue damage of loads of the train wind and the natural wind to the structure of the sound barrier is reduced, and therefore the aims of prolonging the maintenance period and service life of the structure of the barrier are achieved, and the use cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of railway engineering, in particular to an adjustable automatic load reduction sound barrier. Background technique [0002] Bridges are one of the important infrastructures for building railways, and they are also key technologies for railway construction. From the perspective of saving land resources and environmental protection, and according to the needs of technology, the proportion of bridges in high-speed railways (including passenger dedicated lines and intercity railways) with a speed of more than 200km per hour is much higher than that of ordinary lines. Japan has the highest proportion of high-speed railway bridges abroad, where the cumulative bridge lengths of Joetsu Shinkansen and Tohoku Shinkansen account for 61.5% and 58.1% of the total length of the entire line, respectively. China's Beijing-Tianjin intercity high-speed railway bridges accounted for 87.7%, the Beijing-Shanghai high-speed rai...

AI Technical Summary

Problems solved by technology

However, when the high-speed EMU passes through the section of the viaduct where the sound barrier is set, the air disturbance between the vehicle and the sound barrier will intensify, forming a strong train wind, which makes the air pressure on the surface of the sound barrier change suddenly, forming a transient state Pressure shock, positive and negative pressure peaks appear successively in a short period of time, resulting in pulsating pressure waves to the sound barrier structure, resulting in the occurrence of loosening and partial cracking of concrete in the sound barriers connected by bolts in high-speed railways shortly after operation

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