Bearings

Design considerations relating to bearings are described with diagrams under the headings of articulation, loading, fixity, restraint, movement and rotation. Types of bearings are also described and comments are made relating to the choice of bearings. The installation and bedding of bearings is detailed and illustrated for different types of deck, while mention is made of inspection and maintenance for different bearing types. Bearing replacement is treated in some depth, dealing with jacking strong points, replacement sequence, jacking load, articulation, jacking operation, bearing removal and installation, grouting and dejacking. Ten diagrams and ten photographs follow, illustrating both problematic and good practice.