centering

WordNet

(American football) putting the ball in play by passing it (between the legs) to a back; "the quarterback fumbled the snap" (同)snap

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/11/26 02:22:38」(JST)

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Model of centring for a ribbed dome structure at Albrechtsburg.

Centring^[1], centre^[2], centering^[3], or center^[4] is a type of falsework: the temporary structure upon which the stones of an arch or vault are laid during construction. Once the arch is complete, it supports itself, but until the keystone is inserted, it has no strength and needs the centring to keep the voussoirs in their correct relative positions. A simple centering without a truss is called a common centering.^[3] The cross piece connecting centering frames are called a lag or bolst.^[5]

The centring is normally made of wood timbers, which was a relatively straightforward structure in a simple arch or vault, but with more complex shapes, involving double curvature, such as a small dome or the bottle-shaped flues of the kitchens of some Norman-period houses; clay or sand bound by a weak lime mortar mix could be used. The shaping of this sort of centring would probably be done by eye, perhaps with the help of a template and the stone or brick structure laid against it. On bigger work, like a 19th-century commercial pottery kiln, this was impractical. The structure would be built round a post acting as a datum, and each course of stonework would be set at a distance from the datum as measured by a stick or string.

On completion of the intended structure, the centring of whichever sort is removed called "...striking the centering...",^[3] and work on pointing and other finishing continued.

Gallery

A simple arch centre suitable for single skin brickwork.
A centre for a flat segmental arch.
The centring for a semicircular arch.
Centring of trusses, not common centring

Catenary arch kiln under construction over centering

External links

Wikimedia Commons has media related to Centring.

An illustrated glossary of the terms used in temporary types of construction work. Formwork, scaffolding etc.

References

^ "Centring" def. 3. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009
^ "Centre" def. 13. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009
^ ^a ^b ^c "Centering 2, Centring 2" def. 1. Whitney, William Dwight, and Benjamin E. Smith. The Century dictionary and cyclopedia. vol. 2. New York: Century Co., 1901. 885. Print.
^ "Center 2,Centre 2" def. 1. Whitney, William Dwight, and Benjamin E. Smith. The Century dictionary and cyclopedia. vol. 2. New York: Century Co., 1901. 885. Print.
^ Ching, Frank. A visual dictionary of architecture. New York: Van Nostrand Reinhold, 1995. 3. Print.

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Centering Prayer | Walking in the Shadows Centering Head IN SELF-CENTERING CNC VISE | 3900-2220 Kurt J. Lesker Company | KF (QF) Centering Self-Centering Bits-Self Centering Bits Audio Download / Centering Audio Download 82mm SELF CENTERING MILLING MACHINE VICE Centering Prayer, 2015

[1] "Centring" def. 3. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009

[2] "Centre" def. 13. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009

[Century-3] "Centering 2, Centring 2" def. 1. Whitney, William Dwight, and Benjamin E. Smith. The Century dictionary and cyclopedia. vol. 2. New York: Century Co., 1901. 885. Print.

[4] "Center 2,Centre 2" def. 1. Whitney, William Dwight, and Benjamin E. Smith. The Century dictionary and cyclopedia. vol. 2. New York: Century Co., 1901. 885. Print.

[5] Ching, Frank. A visual dictionary of architecture. New York: Van Nostrand Reinhold, 1995. 3. Print.

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