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concrete shell
A concrete shell, also commonly called ''thin shell concrete structure'', is a structure composed of a relatively thin shell of concrete, usually with no interior columns or exterior buttresses. The shells are most commonly flat plates and domes, but may also take the form of ellipsoids or cylindrical sections, or some combination thereof. The first concrete shell dates back to the 2nd century.
==Uses==
Most concrete shell structures are buildings, including storage facilities, commercial buildings, and residential homes. Concrete shell construction techniques are well suited for complex curves and are also used to build boat hulls (called ''ferroconcrete''). Historically, it was used by the British to create the Mulberry Harbours for the 1944 D-Day invasion of Normandy.
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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