A curb, or a horizontal timbering, around the mouth of a shaft.
A horizontal timber joining rafters, the cross piece in a single r frame.
Entry to a shaft. Usually supported by pig stying timber for 10 or 15 feet to support the upper loose ground.
A timber which spans across a truss at high level, linking the principal rafters. A cambered collar curves slightly upwards.
Horizontal timber spanning between rafters of a pitched roof preventing outward movement thereof.
The timbering or concrete around the mouth or top of a shaft or winze.
The mouth or upper end of a mine shaft.
Horizontal timber member intended to restrain opposing roof slopes. Absence, removal or weakening can lead to Roof Spread.
A portable timber sleeve that is located around the outer perimeter of the pallet deck - usually constructed with hinges at each corner.
The term applied to the timbering or concrete around the mouth of a shaft; also used to describe the top of a drill hole.
Horizontal timber beam which restrains opposing roof slopes. Used to prevent 'Roof Spread'.
The immediate surface at the top of a shaft, or the start of a drill hole.