Graphical Construction Glossary >> Temporary Work. >> shoring >> Semicircular-Arch Centering
The arch above is known as semicircular and in older building the term Roman Arch is used.
The Roman builders of two thousand years ago would be quite familiar with the type of arch center shown below.
The main parts of an arch center and they define the curves are the ribs. Think of the ribs as being similar to roof trusses. They are made up of the doubled up curved section. The ties and the braces. These can of course be made out of plywood or rolled steel sections, but timber is still commonly used.
The ribs are joined together by the lagging and the plates.
The number of ribs used in the sketch is only two, and so it is suitable for an arch in a wall. However if more ribs are added, along with more supports then it is easy to see that a barrel vault could be centered.
A couple of simple centers are shown here.
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