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It is rocker bearing short note to resist service movements and damping depending on shott material used. Also, in the case of rocker bearings, failures have been caused by accumulation of debris below the rockers. For tall and slender segmented rocker shoes, the danger of toppling over was omnipresent. From Wikipedia, the free encyclopedia. Skip to main content.

Bearings in bridges. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Elamathy Murugan Follow. Published in: Engineering. Full Name Comment goes here. Are you sure you want to Yes No. Abdul Rahman. Vishva Dave. Mayuri Devakatti. Show More. No Downloads.

Views Total views. Actions Shares. No notes for slide. Bearings in bridges 1. Bearings are important elements in large infrastructures such as bridges, heavy buildings and high rise buildings, ensuring load transfer, movement, rotation, vertical or horizontal restraints as required by the design at critical locations in a structure 2.

Bridge Bearings are structural devices positioned between the bridge superstructure and the substructure. Their principal functions are as follows: 1. To transmit loads from the superstructure to the substructure 2. To accommodate relative movements between the superstructure and the substructure.

Until the end of the 18th century all structures of any appreciable size were built of stone, brick or mixed masonry. These structures, generally massive, are little affected by environmental changes and any slight movements which may occur are compensated either by deformation of the constituent materials or by small displacement of the supports. In the 19th century, with introduction of cast iron and steel larger structural spans accompanied by lightening of the structure which becomes-more slender and flexible and loses some of the thermal inertia.

They must then be fitted at their support points with simple devices, called bearings, which can withstand movement and, more particularly, the expansion or contraction due to temperature changes. However, these stout bearings are still used extensively on railroad structures due to their very durable nature and high impact load-carrying capabilities.

A moderate amount of periodic maintenance is required for this style of bearing in order to keep them in good working order. Rocker Bearings are of many varied types and styles — they are limited only by the imagination of the Design Engineer! The design of these bearings must take into account the welding practicality and the access for the welder of all joints that require welding.

Excessive weld sizes or the design of partial and full penetration groove welds when unnecessary should also be avoided. Over-done or unnecessary welding can add extensive costs to these bearings but add no durability or service life to the bearings. This is especially recommended on railroad structures where large impact loads are possible. However, please be aware that for plates over 4 inches in thickness, yield and tensile strengths may be less or the required steel specification may have to be changed to provide the strength required.

Please contact our Engineering Staff with any questions on steel over 4 inches thick. Forged or cast steel for the bearings will be considered on demand. Nuts — recess pin nuts or plain pin nuts — should be of the same material as the steel plates.

Cosmec will provide the pins and nuts threaded as required and various methods, such as the use of cotter pins, can be used to prevent the nuts from loosening with time and rotation.

Grease on the pins and mating parts should be a waterproof medium consistency grease. Grease fittings for the lubrication of hidden parts can be provided when necessary.

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