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工程案例|中國鐵路科學院|
瀏覽: 發布日期:2021-01-05
項目概述:
高速鐵路隨著列車運行速度越來越快,噪音越來越大。及時加強鐵軌打磨次數,噪音問題依然還是存在。常規的里面聲屏障對軌道面的降噪效果有限,僅在傳播方向上切斷噪音路徑。德國西門子已經開發了軌道降噪技術。國內軌道板目前不具備降噪功能。利用軌道面空間,安置吸聲材料,達到降低列車高速運行噪音的目的。
 
要求概述:
整體結構滿足吸聲能力(吸聲系數越高越好,NRC≥0.75,最好達到0.9以上。)滿足維護維修需要(吸聲面上需要行走維護人員,暫定200KG人獨立行走,并且滿足維護工具掉落沖擊)
面密度要求:對吸聲模塊即吸聲材料和后背空腔需達到至少200kg/㎡的要求,保證車輛行駛過程中產生的負壓不對吸聲模塊產生破壞。
  •       防水(同時保證防積水)、耐腐蝕、耐日照抗老化
  •       模塊采用直接鋪設在軌道面上,軌道面平面度1mm/5m。
  •       后背空腔體腔深在80mm以上。軌道面與鐵軌上部距離180mm左右,不夠的情況可采用門型筋進行墊高加固。
  •       所用方案實現良好的配合與安裝,設計防水、防電信號干涉。
泡沫鋁方案

吸聲材料:
吸聲系數NRC≥0.75。尤其在500Hz~2000Hz(高鐵重點關注頻段)所有吸聲系數>0.6以上。產品厚度:15mm,密度>0.3g/cm3泡沫鋁板材彎曲載荷1200N,滿足120kg行走需要。
項目結構:
空腔實現:采用水泥澆筑龍骨,澆筑80-100mm空腔;
密度實現:選用C4以上水泥,采用纖維水泥,保證基座強度;
安裝實現: 采取安裝扣件預埋,保證泡沫鋁板材與基座實現安裝。
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