arch blocks

arch blocks

[′ärch ‚bläks]
(mining engineering)
Blocks applied to the wooden voussoirs used in framing a timber support for the roof when driving a tunnel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Cut short arch blocks and screw them between the plywood arches about every 6 in.