铁路声屏障设计综述

The Summary of Design of Railway Sound Barrier

研究目的:高速铁路和普速铁路在噪声源组成、位置及传播特性上均有所不同,高速铁路声屏障结构因受列车运行脉动力作用下的疲劳影响,声屏障结构设计有别于普速铁路。本文通过研究高速及普速铁路声源特性、作用于高速铁路声屏障的气动压力和声屏障结构的动力响应,旨在提高铁路声屏障降噪效果和结构安全性。研究结论:(1)普速铁路声屏障等效声源位置为轨面以上0. 5 m,客货列车的等效频率分别为500 Hz、1 000 Hz;高速铁路声屏障等效声源位置为轨面以上0. 6 m和3. 3～4. 9 m,等效频率为1 250 Hz;(2)高速铁路声屏障设计应考虑脉动气压力作用下的疲劳影响,声屏障单元板与H型钢立柱宜采用直插式,H型钢立柱与基础的连接螺栓应采用高强度螺栓并采取防松动措施;(3)声屏障的设置不能影响铁路线路的维护维修、路基排水,距接触网带电体5 m范围内的声屏障金属构件必须接入综合接地系统;(4)本研究结论可为铁路声屏障设计提供指导和借鉴。

Research purposes： The composition, location and propagation characteristics of noise sources of high - speed railways and ordinary - speed railways are different. The sound barrier structure of high - speed railways is affected by the fatigue of train running pulse dynamics, and its sound barrier structure design is different from the structure of the ordinary - speed railway. This paper studies the sound source characteristics of high - speed and ordinary - speed railways, the pneumatic pressure acting on the high - speed railway sound barrier and the dynamic response of the sound barrier structure, aiming to improve the noise reduction effect and structural safety of the railway sound barrier. Research conclusions： （ 1 ） The equivalent sound source position of the sound barrier of the ordinary - speed railway is 0.5 meters above the track surface, and the equivalent frequency of passenger and freight trains are 500 Hz and 1 000 Hz respectively ; the equivalent sound source position of the high - speed railway sound barrier is 0.6 meters and 3.3 - 4.9 meters above the track surface, the equivalent frequency of it is 1 250 Hz. （2） The fatigue effect under the action of pulsating gas pressure is supposed to consider about the design of high -speed railway sound barrier, straight -in type should be adopted in the sound barrier unit plate and H - shaped steel column design, H - shaped steel column and foundation connecting bolts shall be made of high - strength bolts and shall be protected against loosening. （ 3 ） The setting of roadbed. the sound The sound connected to the inte railway sound barrier barrier shall not affect the barrier metal components maintenance and rep within 5 meters from air of the railway line and the drainage of the charged body of the contact net shall grated grounding system. （4） The research conclusions can provide guidance and reference design the be for