UFC 4-152-01
28 July 2005
facilities may be unavailable, damaged, inadequate, or nonexistent. The
primary purpose of INLS is to support ship offload but can be used to
construct piers and wharves when needed. This new system will replace
the existing Navy Lighter (NL) system, which has been in use since World
War II. INLS is comprised of powered and non-powered floating platforms
assembled from interchangeable modular components. Where NL
sections are assembled from smaller pontoons, each INLS module is
fabricated using a traditional tug or barge monohull. Each nonpowered
platform is 80 ft (24.4 m) long by 24 ft (7.3 m) wide by 8 ft (2.4 m) high and
each powered craft hull is 87 (26.5 m) ft long by 24 ft (7.3 m) by 8 ft (2.4
m) with additional height for the pilot house and mast. This provides INLS
with much greater seakeeping capability when compared with NL. In
addition, INLS will be faster than NL, with a 10 knot (5.1 m/s) speed. The
basic platforms of INLS are a Warping Tug, a Causeway Ferry, a Floating
Causeway and a Roll-on/Roll-off Discharge Facility. The Floating
Causeway serves as a pier to support both the offload of the lighterage
and to tie up small vessels. The pier is dug into the beach at the shore
end and moored in place using standard drag anchors.
d. Jack-up Barge. This type consists of a structural steel seaworthy
barge provided with openings for steel caissons, which are lowered to the
harbor bottom when the barge has been floated into final position. The
barge may be completely outfitted during construction with ship fenders,
deck fittings, and utilities including power, lighting, communications, water
supply, sanitary facilities, etc., so that once it is jacked into position and
utility tie-ins are made, it is ready to receive ships. Circular pneumatic
gripping jacks, mounted on the deck above the caisson openings, permit
the barge to be elevated in steps. The barge is loaded with steel
caissons, a crane for pile erection, and other tools and materials required
for the fieldwork, and is towed to the site. At the site, the barge is moved
into approximate position and the caissons are dropped through the jacks
and hull by the crane. The caissons, suspended above the harbor bottom
and supported by engaging the jacks, are seated into the harbor bottom
by dead weight. The barge-like deck is jacked to the required elevation
and locked. Each caisson is then released from its jack and driven to
refusal or required penetration. When all caissons are driven, the hull of
the barge is welded to the caisson, the jacks are removed, and the
caissons are cut off flush with the deck and capped with steel plates. In
some situations, the caissons are filled with sand to avoid buoyancy
problems. Jack-up barge type structures are also constructed using
hydraulic jacks and open-trussed towers instead of pneumatic jacks and
circular caissons.
e. Template. This type involves the fabrication of the various structural
components of the pier, transportation of the prefabricated units to the
construction site by barge, and erection of the prefabricated units to form
the completed facility. As noted under jack-up barge, the template type
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