The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1918-05-09
Use of Cement Gun in Occur dAlenes

per was placed. Three eighths inch
Turing strips we're then nailed ION
and 1-inch chicken netting stretched
tight and fastened to them. One and
one quarter inches of gunite was
shot on, one-to- four mixture being
used with an addition of 10 per cent
hydrated lime. After this had set, a
coat of Flotine paint was applied.
Melting snow has shown one small
leak around a vent pipe, but this was
easily stopped. This leak was prob
ably caused by heavy rain falling
the night after the roof had been shot.
The wooden lath having been pur-
chased before the gun was decided on,
the inside of the building was hand
plastered Two of the best hand
plasterers obtainable, with a crew of
one mud man and three helpers, or q
total of six men. placing plaster 3-S
OF AN inch thick, did not cover as
much as was done on the outside
walls by a crew of five men with the
cement gun, placing material N
inches thick.
On the large ore bin studding was
placed between the posts, and on this
old boards We're nailed with 3-inch
Turing strips, to which was nailed
diamond mesh expanded metal lath.
Gunite IA inches thick, was shot on
at one application, no hand work be-
ing done, This surface is 77x36 feet.
and was completed in ~ days at
considerably less cost than galvan-
lied iron, and presented a heater and
superior wall. The same company
completed at the Hercules mill, at
Wallace, last fall. tank 60 feet in
diameter for the Franz thickener. The
bottom of this tank was lightly con-
cave in shape, and was built of hand
which the thickened product is drawn
off, extends underneath the bottom
from the center of the tank to a point
outside. On the radius Of the walls
of the tank 5-S-inch square twisted
rods spaced about four feet on CEN
ters were placed upright in the foun-
dalton concrete, extending about s
feet above the foundation. The upper
8 inches of these rods were bent at
right angles. Three quarter inch
square twisted rods, bent on roller
to radius Of 80 feet, were then wired
to the vertical rods, the spacing rang
ing from inches at the bottom to 10
inches at the top. The walls Of the
tank had to be strong enough to bear
the weight and to withstand the vi
bration of the mechanism, which con-
sisted of a 16-inch worm rotating at
u rpm. the actuating mechanism
being a SHIP. motor and the necessary
gears mounted on a truck which runs
on rails on top of the walls. 1t was
therefore deemed advisable to make
the walls inches thick
On top of the rods two layers of
reinforcing mesh were placed. Tenn
plates, cut from planks to radius
of 80 feet were attached to the rein
forcing 10 inches below the top, and
held In place by brackets made of
lhx1T Inch strap iron. The brack-
stove bolts and were wired to the
rods. The lower end of the brackets
and the outer edge Of the new boards
were afterward imbedded in the wall,
and to the inner edge the wooden
overflow lip was nailed. In shooting
the walls of this tank, canvas form
was used. The canvas was first
stretched tightly over the outside of
the reinforcement, and wired in place,
after which 1t was thoroughly wet to
further tighten it, The gunite, con-
sisting of 3-to-1 mortar with 10 per
cent hydrated lime, was then shot
from the inside to a thickness Of
about IN inches. After this had set
the canvas was removed and the wall
completed by shooting layers from
both sides. thereby producing a wall
| 6 inches thick, with reinforcement In
the center. After the sidewalks were
completed, layer Of triangle mesh
was placed on the bottom, and a coat
Of gunte shot over It, neatly finishing
the work at the walls. Water was
turned into the tank within two
weeks after completion; 1t has been
kept full ever since, and as yet no
sign of leak has developed.
]. Il. Torkelson, construction sup
erintendent of the Hecla Mining corn
pany, where the cement gun was also |