Bridge Bearings and Expansion Joints
A bridge basically is made up of bridge deck sustained by piers. To prevent over stressing as well as damage by movements of motor vehicle and loading towards the piers, bridge bearings are utilized to deal with these movements in order to decrease the reaction forces and bending movement to inside the safety limits of structure. Natural Rubber is a great engineering material for bridge bearings since it is highly elastic and adequately soft to accommodate these movements with out transferring harmful stress as well as it may absorb and isolate energies from influences and vibrations.
Types of bridge bearings
Laminated bearings: an elastomeric bearing that contains steel laminates bonded to rubber
Plain pad bearing : a plain rubber pad that contains no steel plates
Strip bearing : a plain pad bearing that the length is a lot higher than the width ( > ten times)
Pot bearing : a bearing composed basically of a block of solid rubber enclosed from a metal piston as well as metal cylinder
Manufacturing Procedure
Preparing of rubber compound in accordance with specs required
Planning of steel plates
Application of bonding agent to steel plates
Assemblage of compound and plates
Compression moulding
Overall performance Test
Completely ready for installation
An expansion joint or movement joint is definitely an assembly made to safely absorb the heat-induced expansion and contraction of varied building materials, to absorb vibrations, to keep specific components together, as well as to permit movement caused by ground settlement or earthquakes. They're normally found between parts of sidewalks, railway tracks, piping systems, bridges, ships, as well as other structures.
The most common type is rubber expansion joints and concrete expansion joints
All year round, building faces, concrete slabs, and pipelines will expand and contract because of the warming and cooling as a result of seasonal variation, or caused by other heat sources. Before expansion joint gaps were constructed into these structures, they might crack with the stress induced.
The expansion joint could be as simple like a caulked separation in between two parts of the identical materials. Recently, expansion joints are already contained in the design of, or added to existing, brick exterior veneer walls for identical purposes. In concrete and concrete block construction, the phrase utilized is control joint, but acts an identical purpose.
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