28 July 2005
Provide a minimum of three cleats (5,000-lb. [2268 kg] capacity) for securing small
Provide the deck with a nonskid surface. Where wheels or rollers from a brow will
be resting on the float, provide guide channels or a skid plate to prevent damage to
Reinforced Plastic Landing Float.
The float shown in Figure 7-2 is constructed of a planking material, referred to as
"rovon planks," formed by wrapping glass roving, spirally, around rigid polyurethane
foam cores. For extra strength, several wrappings may be applied. The float is 60 ft
(18.3 m) long, 14 ft (4.3 m) wide, and 5 ft 4 in (7.6 m) deep. It weighs about 26,000
lbs (11793.6 kg.) The deck is covered with a nonskid coating. In unloaded
condition, the float draws 2 ft 1 in (0.64 m) of water and in a loaded condition the
float, designed for a uniform live load of 100 lbs/ft2 (488 kg/m2) or a concentrated
load of 500 lbs (2268 kg) placed at any point on the deck, draws 3 ft 7 in (1.1 m) of
water. Cleats and a timber fender system are provided. A 12- by 12-in (305 by 305
mm) timber member is attached at each end to receive timber pile guides located at
each corner. For additional details, refer to R605. The float is light, strong, and has
a high roll stability due to the catamaran-type hull construction.
Concrete Float Elements.
Concrete encased plastic foam elements designed for use in concrete floating docks
for marinas can be connected together in various configurations to be used as work
floats. The mass added by the concrete encasement creates a very durable float
that is less affected by waves and live loads than more lightweight systems.
BROW OR GANGWAY.
Brows are used for access to landing floats from the pier or wharf structure, however
they are more frequently used to provide personnel access from a pier or wharf to a