Assertion: arch | /r/HasProperty | self-supporting
Facets:
Source sentences:
text: Voussoirs are laid on it until the arch is complete and self-supporting.
text: Centering Temporary wooden framework used to hold construction material in place until a vault or arch is self-sustaining.
text: This arrangement means that the arch is self-supporting, but temporary supports from below, usually in the form of timber 'centres' (sometimes called 'centreing' or 'arch formers'), must be provided until the keystone has been set in place.