Abstract
It has been increasingly demanded to reduce the noise along the railway lines because of speed-up of vehicle. High soundproof plates therefore have been desired to be installed over the existing concrete noise barrier to promote the performance to decrease the outside noise around the railway track. However, the higher wall which is applied to the viaduct cause the higher load and moment by wind, then it is almost impossible to install high soundproof plates without reinforcing the viaduct sufficiently. Therefore we have proposed a new soundproof system which consists of soundproof plate made of polycarbonate and its supporting frame. The top side of it is supported by a rotary axis, and the other three sides of it are held by the magnetic attractive force. The panel usually remains closed and will open in case of strong wind whose load is over 1.5kPa. In order to confirm the soundproof property when the plate is closed and whether it opens when strong wind blows, an acoustic test and a wind tunnel test have been executed. As the results, it has been made clear that the panel holds the same property as the normal soundproof plate when it is closed, and it actually opens when the wind which pressure is about 1.5kPa blows.
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