Figure 10-30.3x14 warping tug.
A PONTOON CAUSEWAY consists of an inshore
section, an offshore section, and as many intermediate
sections as necessary to make up the desired length.
Lengths up to 1 mile are considered possible. Each
section is a 3x15 structure designed to support a load
of 105 tons with a freeboard of 12".
Each string of the offshore (fig. 10-31) and inshore
sections (fig. 10-32) is made up of 12 P1 pontoons
with a P3 sloped deck pontoon and a P4 ramp-end
pontoon at one end At the other end is an end-to-end
connection pontoonaa P5F (female) end connection
pontoon on the offshore section and a P5M (male) end
connection pontoon on the inshore section. Strings of
the intermediate sections (fig. 10-33) are made up of
13 P1 pontoons with a P5F at one end and a P5M at
Causeways, as well as binges, normally are
transported to the combat area side-loaded on an LST.
bracket on each side of the LST. An LA1 launching
angle is bolted to one of the outboard strings of the
barge or causeway (fig. 10-34).
The LST is listed far enough to the side being
loaded to permit the hinge bar of the pontoon structure
to be hoisted onto the shelf bracket. Then the structure
is hoisted upright, either by a crane or by the winch(es)
on the LST. The hoisting sequence can vary,
depending on the gear used and the LST involved.
Regardless of the method use&personnel from an
amphibious construction battalion, usually with a
SWC or BMC in charge, bring the required gear
aboard and do the job. The ships company make
necessary preparations aboard ship and provide
whatever assistance is required of them.
FLOATING DRY DOCKS
Floating pontoon dry docks are structures
consisting principally of a main wharf-like deck and
vertical side towers constructed of P-series pontoon
units. Pontoon dry docks are submerged by admitting
a controlled amount of water into the deck pontoons
and raised by expelling the water with compressed air.
The tower pontoons act as stabilizers to keep the dry
dock level when the deck is under waler. Dry docks
require 18' of water in which to submerge the decks
12", the maximum safe submergence, and should be
moored in sheltered, quiet water 18' to 20' deep, in an
To facilitate this, you should weld a hinge rail or shelf
area with a smooth bottom, devoid of large rocks or
other obstacles. Two sizes of pontoon dry docks are
presently in the ABFC System. This is identified as
the 4 x 15 (l00-ton capacity) dry dock. Figure 10-35
shows a 6 x 30 pontoon dry dock installation.
The assembly method of erecting pontoon strings
for the dry docks is the same as those used for other
pontoons structures. Only P1 pontoons are used and