Barrel vault
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In architecture, a barrel vault is an extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance. It is the simplest form of vault; effectively a series of arches placed side by side. Barrel vaults are also known as tunnel vaults or wagon vaults.
As with all arch-based construction, there is an outward thrust generated against the walls underneath a barrel vault. The walls will require buttressing or other mechanism to contain the thrust.
Barrel vaults were used extensively in Roman architecture. They were also used to replace the Cloaca Maxima with a system of underground sewers. The intersection of two barrel vaults at right angles will form a groin vault, such goin vaults were also extensively used in Roman architecture.Template:Arch-stub