鉄道高架橋用鋼製無支柱防音壁の開発と音響性能評価

抄録

Large-scale repairs are planned for railway viaducts in the near future, and noise barriers will be replaced with new ones. In preparation for this, the authors have been developing a new noise barrier that is easy to be constructed and has high noise reduction performance. One of the characteristics of this noise barrier is that all wall surfaces on a track side are sound absorbent to reduce under-car noise. It is important to evaluate the relationship between the sound absorption performance of developed products and their noise reduction effects on under-car noise. In this study, a sound absorption coefficient using a reverberation chamber method was measured and acoustic tests using a full-scale model of a railway viaduct were conducted. The results showed that there is relationship between those two, and that reflective structures of the wall surfaces reduce the effectiveness of reducing the multiple reflected sound between the noise barriers and the side of car bodies.