MIL-HDBK-1025/5
4) Pipes. Tubular steel floats with attached clip angles at
each end bolted to a steel deck framework are used. Coating the entire
framework, including the tubes, with coal-tar epoxy provides protection
against corrosion.
5) Steel drums. They are expedient and inexpensive in short
life of substandard construction. Maintenance costs in seawater would be
prohibitive.
Concrete Floats. These provide maintenance-free permanence to
f)
concrete construction and added stability to the floating pier. Lightweight
aggregates to keep the dead load to a minimum, prevention of shrinkage cracks,
honeycombing and segregation, and precise mix control are essential. Concrete
floats can be made with or without reinforcement. When concrete floats are
reinforced, a galvanized wire mesh shall normally be used. The float should
be designed so that at no point will the allowable tensile strength of the
concrete be exceeded.
Wooden Floats.
g)
1) Pressure-treated wood is in use for floating dock modules.
All wood shall be treated in accordance with AWPB Standard MPL for Softwood
Lumber, Timber and Plywood Pressure Treated for Marine (Saltwater) Exposure,
as recommended for a specific site.
2) Flotation units shall include a polyethylene pan,
polystyrene foam block, and polyethylene cap sheet.
Figures 8, 9, and 10 show various types of floats commonly
h)
used.
Deck Materials and Surface
2.3.4.3
Wood Plank Deck. It is used without a coating and also with a
a)
coating to minimize splintering. Roughened surface texture of coatings
imparts nonskid quality. Planks should not exceed 10 in. (254 mm) in width
and shall be spaced l/4 in. (6.35 m) apart. Diagonal planking is sometimes
used for floating docks to provide cross-bracing strength. For appearance and
wearing quality, the planking should be given two priming coats.
Plywood Decking. Commercial grades of exterior plywood are
b)
made with waterproof glues of excellent quality and may be safely used for
exposed decking. Plywood of 3/4 in. (19.05 mm) thickness is more expensive
than 2 in. (50.8 mm) wood planking, but provides greater structural strength
in cross bracing. Plywood decking should be crowned slightly to avoid ponding
in wet weather. It should be painted as described for wood planks. A
synthetic surfacing may be pressure bonded to plywood deck panels under heat
to provide nonskid and long-wearing quality.
Laminated Plank Deck. Laminated plank deck uses nominal
c)
2 by 3 in. or 2 by 4 in. cedar pieces glued together side by side for use in
continuous decking in large, thick planks of any length or width, and it
provides high stiffness. Laminated decks may be used without any additional
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