Keystone

Keystone

The uppermost wedge-shaped voussoir at the crown of an arch that locks the other voussoirs into place.

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Part of Speech: noun
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Industry/Domain: Construction
Category: Bridge
Company: Iowa DOT
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Related terms

keystone

Art history; Visual arts

The middle or topmost stone in an arch or vault that locks the others together.

keystoning

Engineering; Electronic engineering

A form of video image distortion in which the top of the picture is wider than the bottom, or vice versa. Thus, the image area is shaped like a trapezoid, rather than a rectangle.

keystone

Architecture; General architecture

The middle stone at the top of an arch. The keystone holds or locks the other stones together in the rest of the arch.

keystone

Construction; Bridge

The uppermost wedge-shaped voussoir at the crown of an arch that locks the other voussoirs into place.

keystoning

Convention; Conferences

Distortion of a projected image on a screen, where the image is wider on top and narrower on bottom. The image distorts from a rectangle into a trapezoid because the projector is ...

keystone

Building materials; Stone

The last wedge-shaped stone, or voussoir, placed in the crown of an arch.

cellular construction

Construction; Bridge

In early 20th century American suspension bridges, the method of constructing towers from relatively small welded steel box units.

beam bridge

Construction; Bridge

A bridge built of beams, either classified as a short-span or long-span beam bridge, which is supported on beams whose ends rest on piers or abutments.

welded joint

Construction; Bridge

A joint in which the assembled elements and members are united through fusion of metal.

footing

Construction; Bridge

The enlarged lower portion of the substructure or foundation that rests directly on the soil, bedrock or piles; usually below grade and not visible.

pre-tensioning

Construction; Bridge

The method of making prestressed concrete with steel strands under tension as the concrete sets.

flange

Construction; Bridge

The flat top and bottom plates of a box-girder.

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