Single gap expansion joints – an optimal solution for small deck movements

Small movement expansion joints are probably the most important type for most road and bridge authorities due to the dominance of short span bridges in their area of responsibility. Considering the key issues of durability and reliability, robust single gap joints have a great deal to offer and should always be considered for use. Variations on the standard, most commonly used version are available to satisfy specific demands – for example, to minimise installation time and disruption to traffic when installed as a replacement for an old joint. They can also be equipped with surface plates if desired to reduce noise and vibrations under traffic. The factors which should be considered in selecting such an expansion joint for use are presented, along with some well-proven solutions. Armed with this knowledge, bridge owners and engineers will be better able to make informed decisions when selecting and using small movement joints in their structures.