Problem to be solved: to prevent damage due to a vertical vertical load in the pier structure of a road bridge.A buffer 10 is disposed between the upper part 2 and the bridge leg 3.The buffer load 10 is less than the compressive strength of the upper part 2 and the bridge leg 3.When a vertical upward load is applied due to an earthquake, the upper part 2 is kept at its position by inertia and the bridge leg 3 is displaced upward, so that the buffer body 10 disposed between the upper part 2 and the bridge leg 3 is deformed.The buffer body 10 is elastically deformed until the load reaches the yield load, and is plastically deformed when the load exceeds the yield load, and the plastic deformation is continued until the load reaches a predetermined amount of displacement when the load continues.As a result, it is possible to prevent the upper part 2 from being displaced upward, thereby preventing the pulling force from pulling vertically in the vertical and vertical directions against the bridge leg 3, thereby preventing cracking or destruction.Diagram
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