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expansion joint
An expansion joint or movement joint is an assembly designed to safely absorb the heat-induced expansion and contraction of construction materials, to absorb vibration, to hold parts together, or to allow movement due to ground settlement or earthquakes. They are commonly found between sections of buildings, bridges, sidewalks, railway tracks, piping systems, ships, and other structures.
Building faces, concrete slabs, and pipelines expand and contract due to warming and cooling from seasonal variation, or due to other heat sources. Before expansion joint gaps were built into these structures, they would crack under the stress induced.
==Control joints==
Control joints (often confused with expansion joints) are cut into the concrete or asphalt, and are different from expansion joints. Control joints are cut into the pavement at regular intervals to allow cracking to occur in a controlled fashion. Road control joints may be sealed with hot tar, cold sealant (such as silicone), or compression sealant (such as rubber).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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