Ventilation and pressure release type sound absorption and insulation barrier for high-speed railway

Abstract

The invention discloses a ventilation and pressure release type sound absorption and insulation barrier for a high-speed railway, belonging to the field of noise reduction of the high-speed railway. The barrier of the invention comprises a sound barrier sound insulation member and at least one ventilation and pressure release type sound barrier module for ventilation and pressure release, whereinthe ventilation and pressure release type sound barrier module is embedded in the sound barrier sound insulation member and is combined with the sound barrier sound insulation member to form the ventilation and pressure release type sound absorption and insulation barrier. The invention provides a sound barrier module which takes the air pressure difference formed between the inner side and the outer side of a sound barrier when a high-speed train passes through the sound barrier as power to realize the purpose of automatically adjusting the angle of rotary muffled blades of the invention to achieve an optimal pressure release way, and the sound barrier module is combined with the sound barrier sound insulation member of the prior art to form the sound absorption and insulation barrier integrating the functions of sound insulation, noise elimination, noise reduction, ventilation and pressure release, thereby greatly improving the carrying capacity and the economical efficiency of the existing sound insulation barrier for railways.

Description

technical field [0001] The invention relates to a sound barrier, in particular to a ventilation and pressure relief sound absorption and insulation barrier for high-speed railways. Background technique [0002] In the high-speed railway (train speed ≥ 200km / h), when the train passes at high speed, it will be affected by the natural wind load and the train wind load together, which will generate a lot of noise pollution. In order to reduce this pollution, noise is usually installed on both sides of the rail Barriers for sound insulation and dampening. [0003] The current sound barrier is usually a whole board without a through hole. There is a sound-absorbing and muffling material in the board or a sound-absorbing and muffling layer on the base plate, which plays a good role in sound insulation and noise reduction. Chinese patent application number 200720076470.1 "A Noise Barrier for High-Speed ​​Railway Noise Protection". However, the sound barriers currently used in rail...

AI Technical Summary

Problems solved by technology

However, the sound barriers currently used in railways are usually closer to the track (generally about 4m away from the centerline of the rail) in order to achieve better noise reduction effects. When the train passes at high speed, the sound barrier will be affected by natural wind at the same time. The joint effect of load and train wind load, the train wind load is caused by the pressure wave generated by the passing train, under the joint action of these two loads, a strong pulsating force will be generated on the surface of the sound barrier components on both sides of the line , due to the defects of this sound barrier structure without through holes, it is impossible to ventilate and relieve pressure in time, so the sound barrier itself needs to be able to withstand the resulting mechanical load for a long time. The sound barrier components, especially the shell of the metal sound barrier components must have greater thickness

Due to reliability and economic considerations, multi-dimensional metal forming processes are only feasible for materials with a certain thickness, thereby limiting the load-carrying capacity

Therefore, in order to ensure the necessary mechanical bearing capacity, the area, especially the reachable length, of each sound insulation component of the railway sound barrier is limited. Components, the installation of railway sound barriers and the manufacturing costs of their components are relatively high, and at the same time, the common road sound barrier components, especially metal sound barriers, are restricted in the application of railway traffic noise control

[0004] In addition, there are currently sound barriers that can ventilate and relieve pressure. The louver-like structure with fixed blades can be used to ventilate and relieve pressure through the passages between the louver blades. This structure is currently generally used in industrial noise control. It is called anechoic louvers in the industry. , there is also a combination of mufflers and sound barriers, but there is no use and report in the field of high-speed rail noise reduction

However, since the blades are fixed, the size of the ventilation channel is also fixed, so the ability of its ventilation and pressure relief is also fixed.

However, the speed of the train may be different, and the natural environment of the railroad track, including factors such as temperature, humidity, wind force and wind direction, is constantly changing. Therefore, the air flow speed and air volume will also change constantly. If the size of the ventilation channel remains unchanged, New noise may be generated due to untimely or uneven ventilation and pressure relief, resulting in poor ventilation, pressure relief, sound absorption, and sound insulation effects of the overall sound barrier, and ventilation, pressure relief, sound absorption, and sound insulation cannot be taken into account. Adjust in real time according to the situation

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