PURPOSE: To obtain sufficient damping property by interposing a highly damping laminated rubber etc. which inhibits horizontal vibration between the bracket and roadbed slab on concrete subgrade and gives sufficient damping property against vertical vibration.
CONSTITUTION: A laminated rubber 2 is installed on a concrete subgrade 1, the laminated rubber 2 being a damping laminated rubber with less damping amount than the standard laminated rubber of natural rubber base which has no problem of creep etc. on a concrete subgrade 1 or the conventional highly damping laminated rubber, and being soft in the vertical direction. Next, a roadbed slab 3 is positioned on the laminated rubber 2 by interposing laminated rubber 4 between the incline face 3a of roadbed slab 3a and the inclined face 1a, which is parallel to the inclined face 3a, on a bracket 1a of the subgrade 1. The laminated rubber 4 is formed from highly damping rubber or viscoelastic material which inhibits horizontal vibration and has sufficient damping property against vertical vibration. This construction offers sufficient damping property against vertical and horizontal vibration.
KIMURA MASAHIKO
MASUDA ISAO
HAZOME TAKENORI
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