TM 55-3810-229-14/N
TM 55-3810-229-14/NAVFAC P-941
c. Loading. The cranes will be loaded onto
tiedown details are shown in figure 6-2. The bill of
materials and their application are listed in tables 6-1 and
vessels in their minimum configuration; that is, with the
6-2, respectively.
outside mirrors removed. They may be loaded under
d. Special Design. Seatrain/trailer vessels, roll-
their own power or by cranes of adequate capacity
on/roll-off ships, landing ships, and attack cargo ships
aboard landing craft, heavy beach and amphibious
are equipped with patented lashing gear and pre-
lighters, and landing ships. When tidal conditions are
positioned fittings in the decks. The use of such
suitable and ramps are available, the cranes also can be
equipment is adequate without additional blocking and
loaded under their own power onto the decks of barges
bracing. For movement by barge or similar lighterage,
from a pier. In addition, they can be loaded onto
the vehicles must be blocked and braced. When
seagoing vessels and barge-type ships (LASH or
transporting vehicles extended distances on rough water,
SEABEE) by shoreside or floating cranes of adequate
vehicles loaded aboard landing craft and amphibious
capacity or by heavy-lift ship's gear. Also, the vehicles
lighters should be lashed, blocked, and braced.
can be loaded onto roll-on/roll-off vessels either under
their own power or by towing. Typical blocking and
Table 6-1. Bill of Materials for Blocking and Tiedown of MT-250 and MT-300 Cranes in General Cargo Vessel (Fig 6-2)
Approximate
Item
Description
Quantity
Lumber
Douglas fir, or comparable, straight-grain, free from material defects; Fed Spec MIL-
L-751:
4- x 6-inch
12 lin ft
2- x 12-inch
60 lin ft
6- x 8-inch
112 lin ft
Nails
Common, steel; flathead; bright or cement-coated; table X1-b, Fed Spec FF-N-105: 40d
80
Wire rope
6 x 19, IWRC; improved plow steel; preformed, regular-lay; table X, Fed Spec RR-W-
410: 5/8 inch
130 ft
Clamps
Wire rope, U-bolt clips, saddled, single-grip, steel, Crosby heavy-duty or equal; MIL-
STD 16841: 5/8-inch
48
Thimbles
Standard, open-type: 5/8 -inch
8
Table 6-2. Application of Materials for Blocking and Tiedown of MT-250 and MT-300 Cranes in General Cargo Vessel
Item No. Required
Application
A
6
Lumber, 2- x 12- x 120-inch. Pre-position on vessel hold deck so that one piece will be under each wheel.
B
2
Side blocking for rear wheels, 6- x 8- x 120-inch lumber. Locate at sides of rear wheels.
C
2
Side blocking for front wheels, 6- x 8- x 120-inch lumber. Locate at sides of front wheels.
D
4
End blocking, 6- x 8- x 96-inch lumber. Locate on top of items B and C. Locate one in front and rear of front
set of wheels and in front and rear of rear set of wheels. Toe-nail each end to B and C with four 40d nails.
E
8
Backup cleats. Each consists of 4- x 6- x 18-inch lumber. Locate on top of side blocking (items B and C)
against item D. Nail to side blocking with four 40d nails.
F
as required Bracing. Each consists of 6 x 8-inch x length-cut-to-suit lumber. Brace as required against adjacent vehicle,
cargo, or side of vessel bulkhead, as appropriate. Secure end of each piece to adjacent blocking by
toenailing with four 40d nails. (Lumber and nails for this requirement are not included in table 6-1.)
G
8
Wire rope, 5/8-inch. Form two loops from each vehicle tie-down provision to appropriate deck padeye.
H
32
Clamps, 5/8 -inch. Secure the ends of each wire rope at the overlapped area with four clamps, spacing the
clamps 31/2 inches apart, with a minimum of 6 inches from the ends of the rope. At each vehicle tiedown
provision, secure the thimble and wire rope together with one 3/4-inch clamp (item J).
I
8
Thimbles, 5/8-inch. Place one at each vehicle tiedown provision where the wire rope passes through.
J
8
Clamps, 3/4-inch. Use to secure thimble to wire rope.
6-4
