Bridge bearing is the crucial and most important device that is to be placed in between bridge structure and the superstructure. These bearing are the having the responsibility of transferring the applied load which includes wind load, traffic load, earthquake load, and its own weight. The bridge bearings manufacture also make the bearings responsible for making the room for rotatory movement and translation movement in horizontal and transverse directions. There are two categories of bridge bearings:
The first one, expansion bearings, allows both translational movement and rotational movements. Whereas the second one only allows rotational movements and a little bit of translational movement. Types of Bridge Bearings:Bridge Bearing Manufacturers have introduced multiple forms of bridge bearings, some basic types of bearings are listed below:
Rocker and pin bearings:Rocker and pin bearings are made up of a curved bottom surface and a pin shaped top surface, to allow the translation movements as well as rotation movement. These are fixed bearing that makes room for rotation with the help of steel pin. Sliding bearings:Sliding bearings are consistent of two metal plates that slide relative to each other making translational movement possible. These plates are mostly made out of stainless steel and have a lubricating material in between to assist in movement. Roller bearings:Roller bearings are made in two typical forms, one where a single roller is placed between two plates and the second where various rollers are placed in between two plates. These are mostly used in the construction of reinforced steel or concrete bridges. Curved bearings:Curved bearings basically are made up of two curved plates. If the curved bearing employed are cylindrical in shape, then they will only allow rotation movements. But if the curved bearing is spherical, then it can accommodate both rotational movements as well as translational movement. Elastomeric bearings:Elastomeric bearings are either made from natural or synthetic rubber are subjected to accommodate both translational movements as well as rotation movement through elastomer deformation. There are various elastomeric bearings that are classified upon their use, like cotton duck, plain, steel, and fiberglass reinforced elastomeric bearings pads. Disk bearings:Disk bearings are having various components like the upper plate, top bearing plate, urethane plate, limiting ring, and threading sheer pin. Disk bearings allow both types of movements: rotation and translational movement. They support vertical as well as the lateral load with the help of elastomeric disk and metal ring. Pot bearings:Pot bearings are consistent of the sole plate, keeper plate, steel piston, elastomeric pad, sealing ring, and pot. Pot bearings can successfully support a considerable amount of vertical loads. Translational movement is somewhat limited in a typical pot bearing, reasons why bridge bearing manufacturers have introduced a PTFE sliding surface in the construction modern pot bearings to accommodate translational movement.
0 Comments
Leave a Reply. |
ArchivesCategories |