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Bridge bearings are structural equipment or devices installed between bridge substructure and superstructure to transfer the applied load including earthquake loads; wind loads; traffic loads; and superstructure self-weight.
Bridge bearings also makes rooms for relative movements between superstructure and substructure, for instance, rotation movements and translational movements in horizontal and transverse direction.
Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements.
DESIGN AND MANUFACTURING
They can be designed and manufactured for practically any load in a temperature range between -20ºC and 70ºC and have actually been tested for vertical loads up to 100.000 Kn.
MK4 Canada Bearings
Concrete is not an elastic substance, and therefore it does not bend or stretch without failure. This concrete characteristic is useful and at times harmful on some occasions. Its high compressive strength and hardness make the concrete useful for applications in construction. However, concrete moves during expansion and shrinkage, due to which the structural elements shift slightly.
To prevent harmful effects due to concrete movement, several expansion joints are incorporated in concrete construction, including foundations, walls, roof expansion joints, and paving slabs. These joints need to be carefully designed, located, and installed. The flexible expansion joints are basically designed to mitigate the flexural stresses. These stresses are produced due to the vertical movements of applications adjoining rigid foundation components, like columns or foundations. If a slab is positioned contiguously on surfaces exceeding one face, an expansion joint will be necessary to reduce stresses. For example, if a slab is located between two structures, an expansion joint is essential adjoining the face of one building. Concrete sealer may be used for the filling of gaps produced by cracks.