Bridge accessories

The bridge accessories chapter considers parapets, expansion joints, drainage and waterproofing. Parapet containment levels, working width classes and impact severity levels are tabulated, followed by a mention of aesthetics and the risk assessment approach to containment. Parapet materials are described, prior to a description of design considerations. The common types of expansion joints are described, together with the design approach, drainage measures, detailing, and installation and maintenance. Bridge drainage is described with respect to abutment and retaining walls, carriageway, sub-surface, and the abutment shelf. A brief history of bridge deck waterproofing is presented, followed by descriptions of the types of waterproofing, detailing, and installation and maintenance.