声屏障顶端降噪器在铁路声屏障工程中的应用

The Application of Edge-modified Noise Barriers in the Railway Noise Barriers

结合声屏障顶端降噪器在铁路声屏障工程中的应用,对顶端降噪器的附加降噪效果及其适用范围进行了测试分析研究。根据现场实测结果,A型声屏障顶端降噪器在距离铁路外轨中心线15 m、距地面不同高度(距地面3-9m高)取得了1.3～2.4 dB(A)的附加降噪效果;C型顶端降噪器在距离铁路外轨中心线12.5 m和25m、距地面不同高度处,取得了2.3～2.9 dB(A)的附加降噪效果。顶端降噪器可作为直立式声屏障的重要补强措施,以提高声屏障的总体降噪效果;对有限高要求,直立式声屏障又不能满足降噪效果要求时,可采用顶端降噪器提高声屏障的降噪效果。

According to the application of edge-modified noise barriers in the railway noise barrier projects and on-site measurement of the noise reduction effect,the additional noise reduction and the applicable scope of edge-modified noise barriers is analyzed and studied.The result shows that： outside the centerline of the rail lines 15 m,different height apart from the ground（apart from the ground 3～9 m high）,the additional noise reduction effect of A-type edge-modified sound barriers is 1.3～2.4 dB（A）;outside the centerline of the rail lines 12.5 m and 25 m,different height apart from the ground,the additional noise reduction effect of C-type edge-modified sound barriers is 2.3 ～ 2.9 dB（A）.In order to improve the overall reduction effect of noise barriers,the edge-modified noise barriers are the important and necessary supplements of upright type noise barriers.