Centring

Centring
Model of centring for a ribbed dome structure at Albrechtsburg.

Centring (UK), or centering (US), is the structure upon which the stones of arches 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.

The centring is normally made of wood, 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, and work on pointing and other finishing continued.

Gallery

See also

Catenary arch kiln under construction over temporary form

External links



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Look at other dictionaries:

  • Centring — Cen tring, n. See {Centring}. [1913 Webster] …   The Collaborative International Dictionary of English

  • centring — Centering Cen ter*ing, n. (Arch.) Same as {Center}, n., 6. [Written also {centring}.] [1913 Webster] …   The Collaborative International Dictionary of English

  • Centring — Center Cen ter, Centre Cen tre v. i. [imp. & p. p. {Centered} or {Centred}; p. pr. & vb. n. {Centering} or {Centring}.] 1. To be placed in a center; to be central. [1913 Webster] 2. To be collected to a point; to be concentrated; to rest on, or… …   The Collaborative International Dictionary of English

  • centring — centravimas statusas T sritis automatika atitikmenys: angl. centering; centring vok. Zentrieren, n; Zentrierung, f rus. центрирование, n pranc. centrage …   Automatikos terminų žodynas

  • centring — centravimas statusas T sritis Standartizacija ir metrologija apibrėžtis Geodezinio įtaiso stačiosios ašies sutapdinimas su sunkio linija, einančia per matavimo centrą. Centruojama siūliniu arba optiniu svambalu, kuris pridedamas prie įtaiso.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • centring — centravimas statusas T sritis Standartizacija ir metrologija apibrėžtis Lęšių, fotografijos objektyvų ir kitokių optinių sistemų geometrinės ir optinės ašių sutapdinimas. atitikmenys: angl. centring vok. Zentrieren, n; Zentrierung, f rus.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • centring — noun The act of moving something to the centre …   Wiktionary

  • centring — n. concentration of attention or energy on something; (American football) passing the ball back between the legs to start a downn. middle, midpoint, place located in the middle; organization or place which offers a specific kind of service or… …   English contemporary dictionary

  • centring — (US centering) noun 1》 the action or process of placing in the centre. 2》 Architecture framing used to support an arch or dome under construction …   English new terms dictionary

  • centring — cen·tring …   English syllables

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