城际铁路单侧高层建筑物声屏障形式设计研究

选择合理的声屏障形式与高度,可有效降低噪声污染、减少搬迁量。设置声屏障,是控制声传播途径的最有效办法。以某城际铁路穿越城市建成区,为保护单侧高层声环境敏感建筑为例,通过对直立式声屏障、全封闭声屏障和半封闭声屏障的比选,确定声屏障形式选用半封闭式。在满足接触网、桥梁等专业要求的基础上,通过声学计算、结构检算,确定半封闭式声屏障总高度为8m,跨度11.3m。对于列车设计时速250km及以下时速的城际铁路,设置半封闭式声屏障,单侧降噪效果在8.7~11.2dB,可满足铁路边界噪声限制要求。

Design Study on the Type of Sound Barrier for Protecting High-rise Buildings along Single Side of Intercity Railway

Sound barrier is the most effective way to control sound transmission.And selecting reasonable sound barrier type and height can effectively reduce the noise pollution and the relocation quantity.In this paper,a sound barrier project was taken as an example,which was designed to protect the sound-sensitive high-rise buildings located at one side of an intercity railway which passes through an urban built-up area.Through comparison among upright type sound barrier,fully-enclosed type sound barrier and semi-enclosed type sound barrier,this paper decided to use the semi-enclosed type sound barrier.And then on the premise of meeting the requirements of catenary,bridge and other relevant subjects,and by means of acoustic calculation and structural calculation,this paper determined that this semi-closed type sound barrier should be eight meters in height and 11.3 meters in span length.It is concluded in this paper that for the intercity railway with design speed of 250km /h and below,the noise reduction effect at single side of the railway can reach to 8.7 to 11.2 dB by using the semi-closed type sound barrier,meeting the requirement on noise limit nearby railway.