What are bearings on a bridge?

Bearings are the devices that transfer the traffic loading and the weight of the bridge from the superstructure to the substructure. Bearings also allow the bridge to expand and contract, as well as allowing for rotation of the beams as they deflect under live loads.

What is type of expansion bearing?

The expansion (EX) bearing has a plain outer race roller track. This bearing takes radial load only. The inner race is clamped to the shaft, and moves axially with it when expansion or contraction occurs.

What is spherical bridge bearing?

Spherical Bridge Bearing. Spherical Bridge Bearing. Brief Description : The Spherical Bearing is a structural bearing which consists of a set of concave & convex mating steel backing plate with a low friction sliding interface in between thereby permitting rotation by incurve sliding.

What is PTFE bearing?

POT PTFE BEARING is a bearing which carries vertical load by compression on an elastomeric disc confined in a steel cylinder and which accommodates rotations by deformations of the disc. The elastomer under a triaxial pressure offers low resistance to deformation but high vertical stiffness.

What are the two types of bearing?

There are two main types:

• Ball bearing, in which the rolling elements are spherical balls;
• Roller bearing, in which the rolling elements are cylindrical, taper or spherical rollers;

What is abutment in bridge construction?

A bridge abutment is a structure which connects the deck of a bridge to the ground, at the ends of a bridge span, helping support its weight both horizontally and vertically.

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 articulation in bridge?

Articulation is the term for the configuration of bridge supports and choice of structural bearings that provides the necessary restraints to the superstructure whilst at the same time providing freedom to some displacements and rotations in order to avoid unnecessary forces on both the superstructure and substructure …

Is PTFE and Teflon the same?

Chemours trademarked the name Teflon in 1945 and began selling products treated with this non-stick, heat resistant material in 1946. Teflon is a synthetic polymer containing carbon and fluorine called polytetrafluoroethylene. That’s right, Teflon is PTFE but by another name.

What are the types of bearings?

Bearings are divided into two basic categories: (1) rolling element or “anti-friction” bearings, (2) sliding surface or “plain” bearings. Except as noted, all bearings in this guide are of the “plain” bearing classification.

What are the types of bearing?

There are many different types of bearings, each used for specific purposes and designed to carry specific types of loads, radial or thrust. Here, we’ll look at the 6 most popular types: plain bearings, rolling element bearings, jewel bearings, fluid bearings, magnetic bearings, and flexure bearings.

What are the different types of beam bridges?

A bridge may have different types of spans that include simple, cantilever, continuous etc. Beam bridges can be simple and made of wood beams. Heavy beams are carried by a bridge crane using a beam clamp to hold the beams.

What is preset in bridge bearing?

What is preset in bridge bearing? “Preset” is a method to reduce the size of upper plates of sliding bearings in order to save cost. The normal length of an upper bearing plate should be composed of the following components = length of bearing + 2xirreversible movement + 2xreversible movement.