MIL-HDBK-1032/2
Electrical. Refer to Electrical Engineering, Design
3.5.11
Considerations, NAVFAC DM-4.01, and Electrical Engineering, Electrical
Utilization Systems, NAVFAC DM-4.04, for criteria relating to estimation of
loads, selection of electric power source, and requirements for the
installation, voltage level, grounding, and selection of electric
distribution systems.
Floors. Critical attention to floor design and construction is
3.6
essential to proper operation of narrow aisle high-rise storage systems.
Refer to American Concrete Institute (ACI) Guide for Concrete Floor Slab
Construction, AC1 302.1R-80, for design and construction of Class 5 floors.
Floor Construction. Where construction conditions permit,
3.6.1
construct warehouse floors of reinforced concrete poured on-grade over a
vapor barrier and 6 inch (150 mm) capillary barrier. Precision floor
flatness requirements apply to storage areas only. Coordinate the location
of floor joints, reinforcement steel, and in-floor utilities with vehicle
guidance system and aisle requirements. If a specific layout is not known or
is subject to change, floors shall be designed for any configuration of racks
and shelving.
Concrete Strength. Concrete 28-day compressive strength shall be a
3.6.1.1
minimum of 3,500 pounds per square inch (246 kg/square centimeter (cm2).
Reinforcement. Provide crack control using reinforcement
3.6.1.2
consisting of minimum number 6 welded wire fabric in a 6- by 6-inch (150 mm x
150 mm) mesh or alternative non-reinforced methods.
3.6.1.3
Flatness. Finished surfaces of nonstorage areas shall be checked
for smoothness with a lo-foot (3050 mm) straightedge and comply with ACI Class
Bx surface finish requirements. When placed at any location on the finished
floor, in any direction, the plane of the floor surface shall not deviate
from the plane of the straightedge by more than 5/16 inch (8 mm) at any
location along the straightedge. There shall be no more than 5/16 inch (8 mm)
deviation in any lo-foot (3050 mm) measurement. The elevation difference
between any two points on the floor shall not exceed l/2 inch (13 mm).
3.6.1.4
Thickness. Floor thickness will be determined by a combination of
live load, dead load, strength of concrete, and subgrade conditions. The
nomograph in Figure 18 is based upon information contained in Appendix D of
NAVSUP PUB-529 and provides a means for determining floor load capacity or
required floor thickness for varying conditions of concrete strength and
subgrade reaction. Refer to Structural Engineering, Concrete Structures,
NAVFAC DM-2.04; Soil Mechanics, NAVFAC DM-7.01; and NAVFAC DM-7.02, for more
detailed information on floor and foundation design. Floors in covered
storage facilities shall be no less than 6 inches (150 mm) thick.
3.6.1.5
for durability in areas of exceptionally high activity such as main aisles,
towline paths, or industrial shop areas. Sealers are desirable for dust
control.
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