UFC 4-152-01
28 July 2005
pier may be outfitted, beforehand, with the utilities, deck fittings, and
services that are needed to produce a fully working berthing facility. The
prefabricated structural steel units consist of templates, deck assemblies
made up of cap beams or trusses and stringers, tubular piles, fender units,
decking (timber or concrete), fittings, and miscellaneous hardware. The
template is an assembly consisting of four or more tubular columns
connected with tubular bracing and welded together to form a structure of
height approximately equal to the depth of water in which it is to be
installed. A floating crane is used to transfer the template from the
transporting barge and position it on the harbor bottom. Steel piles are
placed through the template tubular columns and driven to refusal or the
required penetration. If the harbor bottom is very soft, the template is held
in a suspended condition while the steel tubular piles are placed and
driven through the template columns. After pile driving, the space
between the piles and the template columns is filled with grout. As
succeeding templates are erected, deck units, decking, fender units, and
fittings are placed to form the completed marine facility. Based on past
experiences, it is estimated that a prefabricated template type structure,
90 ft (27.4 m) wide x 600 ft (182.9 m) long, could be erected in about 21
days and a structure of the jackup type could be erected in about 3 days.
An advantage of the jackup barge structure is that it can be moved and
reused at other sites. For permanent facilities in remote areas, the floating
type has advantages as the onsite construction is minimized.
f. Container-Sized Modular Pontoons. Commercially available modular
causeway systems are becoming increasingly popular for naval
operations. The pontoons are made from container-sized modules that
can be stored and transported in commercial container ships. The
modules are lifted out and assembled on calm water or launched from a
ship's deck. Cleats, bitts, and other hardware can be installed and
removed as needed. With minor modifications, the individual modules can
be structured to accommodate power units and fuel tanks for use as a
powered causeway. The connector pieces are interchangeable and
removable for rapid repairs. The modular causeway system makes it
possible to transport the causeway to the amphibious operations area on
a container ship or an auxiliary crane ship for rapid deployment."
g. The Modular Elevated Causeway (ELCAS(M)) is a temporary pierhead
and 24 ft (7.3 m) wide roadway made from connected ISO-compatible
P40-Series steel pontoons elevated on piles and extending seaward
across the surf zone to a distance up to 3,000 ft (914.4 m) from the beach.
The entire ELCAS(M) pier facility, including the necessary construction
and installation equipment, is designed to be transported on one
Transport-Auxiliary Crane Ship (TACS). The actual system installation
length is determined by the requirement to reach a maximum water depth
at the pierhead of 20 ft (6.1 m) Mean High Water; with the underside of the
pier structure a minimum of 15 ft (4.6 m) above the Mean Low Water level
40
Previous Page
