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south end of the Reserve Facility, the transtackers are powered
by self-contained batteries, which are charged with power drawn
from the bus bar while the transtackers are in the aisles.
The concrete slab floor below the rack system is a minimum
of 12.5 inches thick with two layers of reinforcing steel bars
encased in the concrete. The slab at the north and south end
clear areas of the Reserve Facility is 8 inches thick. The floor
slab is extra thick under the racks to accommodate the load of
the rack system. A typical heavy duty warehouse floor slab is 5
to 6 inches thick. However, a floor slab for a conventional
building would require footings under the individual supporting
structural columns. These footings would be thicker than the
floor slab, and the size and thickness of these conventional
footings are determined by the column loads and soil
characteristics of the site.
The top surface of the concrete floor slab under the racks
was constructed with an F100 or "superflat" finish, which is
smoother and more level than a conventional concrete floor. The
superflat surface is required for the efficient operation of the
transtackers. With a conventional concrete floor, variations in
elevation in the floor under the transtacker wheels could cause a
transtacker operating with the cab in an elevated position to
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Last modified: May 25, 2011