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centering

centering, the framework of wood or of wood and steel built to support a masonry arch or vault during its construction. The centering itself must be rigidly supported, either by posts from the ground or by trusses when piers are available to receive their ends. After the centering is built, the setting of the masonry proceeds equally from the ends or sides toward the central point, where the keystone of the arch or the crowning blocks of the vault are finally wedged into position. The centering is removed after setting in the case of arches where the shape is dependent on the cement or concrete, but in other instances, e.g., where dressed stone is used with a lime mortar joint, it is better to remove the centering before setting, so that gravity will control the disposition of the stones. Removal of the centering is a delicate operation, since undue stress on one part endangers the whole structure. The Romans built vast domes and vaults of concrete with the aid of wood centerings and of integral brick ribs within the vault itself. Arches of steep rise may sometimes be built without centering. Brunelleschi is said to have dispensed with it in constructing the steep dome of the cathedral of Florence. Today inflatable plastic balloons are often used instead of centering.

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"centering." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"centering." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/centering

"centering." The Columbia Encyclopedia, 6th ed.. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/centering

centering

centering. Timber framework or mould to support arches or vaults during construction, removed or struck after the setting of the mortar and the completion of the arched form.

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"centering." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"centering." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/centering

"centering." A Dictionary of Architecture and Landscape Architecture. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/centering

centering

cen·ter·ing / ˈsentəring/ • n. Archit. framing used to support an arch or dome while it is under construction.

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"centering." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"centering." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/centering

"centering." The Oxford Pocket Dictionary of Current English. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/centering