| 摘要 |
PROBLEM TO BE SOLVED: To allow large relative displacement in a perpendicular direction to a bridge axis by earthquakes, etc. SOLUTION: An expansion device for a bridge is so constituted that ctenoid finger parts 1 opposed to each other are arranged sandwiching an expansion gap 2 to support a wheel load of a traveling vehicle for absorbing the expansion and contraction of bridge axial direction by temperature change, etc. In this case, the finger parts 1 opposed to each other are set in such a manner as to destroy when a force exceeding a predetermined value is applied by generating relative displacement in a perpendicular direction to the bridge axis by earthquakes, etc.
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