Expansion joint

Common card · No. 342333

An expansion joint, or movement joint, is an assembly designed to hold parts together while safely absorbing temperature-induced expansion and contraction of building materials. They are commonly found between sections of buildings, bridges, sidewalks, railway tracks (where it's known as a breather switch), piping systems, ships, and other structures. Building faces, concrete slabs, and pipelines expand and contract due to warming and cooling from diurnal and seasonal variation, or due to other heat sources. Before expansion joint gaps were built into these structures, they would crack under the stress induced.

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