抄録
Generally speaking, a great noise is generated due to rail vibration derived from train passage in rail joint, and an effective counter measure easy to install against the noise generated in rail joint is eagerly requested to develop. Concerning with the countermeasure against the noise radiated from rail, we have developed a new material named "Rail Noise Insulating Material" for standard lines, and have found out that the material is effective to reduce the noise radiated from rail and is easy to install. So, we have developed the new material to install rail joint, named "Noise Insulating Material for Rail Joint (NIMRJ)" that is based on Rail Noise Insulating Material. Taking into consideration the fact that in rail joints the maintenance of it is executed often, the developed material is formed as it is fixed to rail at the place distant from that in the direction vertical to that so that the maintenance can be executed with the material installed. As the results of impact test for evaluating the properties of this material, it has been revealed that the material is effective to reduce the noise radiated from rail, and it is better to cover fully the area between the level of rail bottom and ground level.
