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a. Lagging wedges and secures the roof and sides behind the main timber or
steel supports in a mine and provides early resistance to pressure. If
concrete slabs are used, they are made in lengths to fit between the arch
webs. The lagging behind steel arches in tunnels may be pyrolith-treated,
fire-resisting boards. Also called lacing. Nelson
b. Pieces of timber about 4 ft 6 in by 6 in by 2 in (1.4 m by 15 cm by 5
cm) with one end sharpened or beveled to give the lath an upward trend
when being driven into the roof gravels. A number of laths driven into the
roof form a protective shield for the miners working in the face.
Sometimes called laths. Eng. Min. J., 1
c. In shafts, planks, usually 2 in, placed on the outside of sets. Coeur
D'Alene lagging has 2-in by 2-in cleats nailed to the top and bottom of
the wall and end plates about 2 in back from the outer edge. The lagging
is then cut to fit between the plates and is placed against the cleats and
flush with the plates on the outside. Lewis
d. Narrow boards, generally planed, placed horizontally on the arch frames
of a center. On this lagging the arch of masonry is built. The term is
also applied to poling boards. Stauffer
e. Planks, slabs, or small timbers placed over the caps or behind the
posts of the timbering, not to carry the main weight, but to form a
ceiling or a wall, preventing fragments or rock from falling through.
See also: lagf. Heavy planks or timbers used to support the roof of a mine, or for
floors of working places, and for the accumulation of rock and earth in a
stope. Fay
g. Long pieces of timbers closely fitted together and fastened to the drum
rings to form a surface for the rope to wind on. Fay
h. The narrow strips supporting an arch of masonry while in construction.
Standard, 2
i. The surface or contact area of a drum or flat pulley, esp. a detachable
surface or one of special composition. Nichols, 1
j. Boards fastened to the back of a shovel for blast protection.
Nichols, 1
k. Covering on boilers, tanks, and pipes used to provide thermal
insulation. Pryor, 3
l. Material applied to pulleys to increase traction between the pulley and
belt and to decrease wear on both. See also: backing dealsm. Verb. To install lagging. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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