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A groin vault or groined vault (also sometimes known as a double barrel vault or cross vault) is produced by the intersection at right angles of two barrel vaults. The word groin refers to the edge between the intersecting vaults; cf. ribbed vault. Sometimes the arches of groin vaults are pointed instead of round. In comparison with a barrel vault, a groin vault provides good economies of material and labour. The thrust is concentrated along the groins or arrises (the four diagonal edges formed along the points where the barrel vaults intersect), so the vault need only be abutted at its four corners.

Groined Vault with Zig-Zag Ridge-Joints

A groin vault or groined vault (also sometimes known as a double barrel vault or cross vault) is produced…

A: Penetrations by small semi-circular vaults sprung from same level. B: Intersection by small semicircular vault sprung from higher level; groins form wavy line. C: Intersection by narrow pointed vault sprung from same level; groins are plane curves.

Vaults, Penetrations and Intersections

A: Penetrations by small semi-circular vaults sprung from same level. B: Intersection by small semicircular…