What are elastomeric bearing pads?
Elastomeric bearing pads compress on vertical load and accommodate horizontal rotation and provide lateral shear movement. Elastomeric bearing pads are the most economical solution used in construction of large span bridges and buildings.
What is a bridge bearing pad?
Bridge bearing pads permit controlled movement, such as that resulting from thermal expansion/contraction, with the reduction of associated stresses. The pads also isolate and cushion the impact, shock and vibration that results from vertical loading onto the bridge.
How does elastomeric bridge bearing work?
Laminated elastomeric bearings support simultaneous loads and deformation in any direction. Steel plates are bonded to the rubber through a vulcanization process and have the main scope to increase the resistance of the bearings to vertical loads.
Why bearing pads are used in bridges?
A bridge bearing is a component of a bridge which typically provides a resting surface between bridge piers and the bridge deck. The purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved. The oldest form of bridge bearing is simply two plates resting on top of each other.
How do you install elastomeric bearings?
Installation of bearing. Cut open and remove Laminated Elastomeric Bearings from packing and clean any dirt if found on it. Place bearing on top of applied epoxy resin. Care should be taken, to see that, the bearing is placed according to movements specified in main drawings.
How are elastomeric bearings made?
Steel Laminated Elastomeric Bearings These pads are manufactured from alternating layers of neoprene or natural rubber and steel sheets and are molded under heat and pressure (vulcanization process) into one unit. During vulcanization, the steel laminates are permanently bonded to the rubber.
What are elastomeric bearing pads made of?
neoprene
Elastomeric Bearing Pad Role of the Elastomeric Bearing Pad This is typically made of a strong and pliable material such as neoprene—a type of heavy-duty industrial rubber. These pads are placed in between superstructures such as the bridge beam and substructures such as the vertical supports called piers.
What are the types of elastomeric bearing?
Type A: Hooped bearings entirely coated with elastomer and comprising only one steel hoop. Type B: Hooped bearings entirely coated with elastomer and comprising at least two steel hoops. Type C: Hooped bearings with external steel hoops (grooved or enabling fixing). Devices with external hoops are produced on demand.
What is expansion bearing in bridges?
Expansion bearings provide for rotational movements of the girders, as well as longitudinal movement for the expansion and contraction of the bridge spans. The function of the fixed bearing is to prevent the superstructure from moving longitudinally off of the substructure units.
How many types of bearings are there in bridge?
Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings.
What is the use of bearing in bridge?
A bridge bearing is a component of a bridge transmitting the loads received from the deck on to the substructure and to allow controlled movement due to temperature variation or seismic activity and thereby reduce the stresses involved. A bearing is the boundary between the superstructure and the substructure.
What is expansion bearing?
Expansion bearings, which are also called floated bearings, are designed for radial loads. They have a plain race roller track on the outside. Their inner race is affixed to the shaft. This causes the inner race to move on the axis when there is expansion or contraction within the system.