Elastomeric bridge bearing

The purpose of the elastomeric bearings is to support a bridge or other heavy structure in a way that permits the load to shift slightly, in a horizontal direction, relative to the ground or foundation.

Without such bearings, the bridge support might crack or fracture when it moves due to ground movements or thermal expansion and contraction.

The internal structure of an elastomeric bearing consists of a three layers: a lower "pot" made of steel, which rests on the foundation or footing; a relatively thin elastomeric pad (a rectangle or disk shape) resting on the lower pot; and a steel plate loosely set on top of the elastomeric disk, on top of which the weight of the bridge rests.

Elastomeric bearing pads are the most economical solution used in construction of large span bridges and buildings.

[1][2] Elastomeric bearings are often used in applications other than bridges, for example, supporting buildings that are built on soil that may shift slightly and cause a concrete load to crack in the absence of a elastomeric bearing.