Development of Noise Isolating Material for Rail Joint

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  • Hansaka Masanori
    Material Technology Division, Railway Technical Research Institute (R.T.R.I.)
  • Mamada Shogo
    Material Technology Division, Railway Technical Research Institute (R.T.R.I.)
  • Sato Daigo
    Material Technology Division, Railway Technical Research Institute (R.T.R.I.)
  • So Hisao
    Technology Division, NICHIAS Corporation

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Other Title
  • レール継目用防音材の開発
  • レール ツギメヨウ ボウオンザイ ノ カイハツ

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<p>In general, a high degree of noise is generated due to rail vibration derived from train passage on a rail joint. Therefore, a countermeasure without providing a large-scale installation such as a sound-proof wall is eagerly demanded. Consequently, as a countermeasure which is easy to install, we have developed a new material named “Noise Insulating Material for Rail Joint, abbreviated to (NIRJ)” mainly to be applied to the insulated joint on long rail lines. The NIRJ is molded in inverse-L shape out of inorganic particles, the diameters of which are from 1-mm to 5-mm, bound with small content of epoxy resin. The NIRJ is installed in a standard position so as to keep a distance between rail and inner side of the NIRJ approximately 100 mm in order that rail joints can be inspected without removing the NIRJ even after them installation. As the result of a test intended to verify noise reduction effect of the NIRJ on a conventional commercial line with a ballasted track, approximately a 2-dB decline of noise was confirmed when trailer cars passed on the rail joint installed with the NIRJ.</p>

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