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.
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Cut short arch blocks and screw them between the plywood arches about every 6 in.
Building a drywall arch. (Ask Handyman)

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