Table 7-4. Application of Materials for Blocking and Tiedown of Semitrailer, M747, on CONUS General-Purpose Flatcar

TM 55-2320-258-14

Table 7-4. Application of Materials for Blocking and Tiedown of Semitrailer, M747, on CONUS General-Purpose Flatcar

(Figs 7-2 and 7-3)-continued

Item

No. Required

Application

Clamps. Place four on each item Fat overlap area. Space clamps 31/2-in apart with

a minimum of 6 in. from ends of wire rope (detail 3, fig 7-3). Place oneon each

item G as indicated above.

Component items. Secure ramps to trailer bed using 2- x 4-in., and 41/4 x 4-in.

lumber and steel straps, edge protectors, staples, and 12d nails (fig 7 -2).

GENERAL INSTRUCTIONS

Commodities on Open Top Cars and Trailers, pub-

1. Set brakes.

lished by the Association of American Railroads, for

2. Set air suspension controls so that wheels on all

further details.

four axles are resting on car floor.

4. Tension wire rope with an applicable sized come-

3. See General Rules 1, 2, 3, 4, 5, 14, 15, 19A, and

along mechanical hoist or equal tensioning de-

19B, Section I of the Rules Governing the Load of

vice.

Table 7-5. Application of Materials for Blocking and Tiedo wn

of Truck-Tractor, M911, on CONUS General-Purpose Flatcar (Figs 7-3 and 7-4)

No. Required

Item

Application

Brake wheel clearance. Minimum clearance required is 6 inches above, in back of,

and on both sides of, and 4 inches underneath wheel, 12-inch minimum clearance

from end of car to load, extending from center of brake wheel to side of car and

6 feet above car floor (fig 7-4).

Blocks. Each to consist of one piece of 2- x 6- x 30-inch lumber. Locate one

block against wheel as shown in figure 7-4 and nail to car floor with seven 20d

nails.

Blocks (detail 1, figure 7-3). Each to consist of one pieceof 6- x 8- x 24-inch

lumber cut as shown in detail 1. Locate one block on top of each item B with

45-degree side against tire. Nail heel of block to item B with three 40d nails.

Toenail sides of block to car floor through item B with two 40d nails on each

side.

1 ea item E

Cushioning material. Locate bottom portion under item E, and between tire and

item E so as to extend 2 inches above item E (detail 2, fig 7-3).

Side blocks. Two each to consist of one piece of 2- x 6- x 30-inch lumber and

three pieces of 2- x 4- x 30-inch lumber for the front tires and two each to

consist of one piece of 2- x 6- x 90-inch lumber and three pieces of 2- x 4- x

W-inch lumber for the rear dual tires (detail 2, fig 7-3). Place against inside of

tires and cushioning material and nail to car floor through 2- x 4- x 30-inch

piece with twelve 20d nails. Nail other two 2- x 4- x 30-inch pieces to one

below in same manner. Repeat this operation for the 2- x 6- x 90-inch lumber.

Brace. Each to consist of one piece of 2- x 6-inch x length-to-suit (approximately

60-inch) lumber. Locate one under each axle between items E. Nail to car floor

with ten 20d nails.

Wire rope. Each to consist of one piece 5/8-inch 6 x 19, IWRC wire rope, length as

required (approximately 20 feet). Form a complete loop between tiedown shackle

and appropriate stake pocket at a maximum angle of 45 degrees (detail 3, fig

7-3). Wire rope ends should overlay approximately 24 inches.

Thimbles. Place on under wire rope at each place where rope passes over bottom

edge of stake pocket and tie down shackle. Secure each thimble to wire rope with

one 5/8-inch clamp (detail 3, fig 7-3).

Clamps. Place four on each item H at overlap area. Space clamps 3% inches apart

with a minimum of 6 inches from ends of wire rope (detail 3, fig 7-3). Place one

on each item J as indicated above.

GENERAL INSTRUCTIONS

1. Set handbrakes, and block and wire levers in place.

2. Place and wire-tie gearshift levers in the neutral position.

3. For further details, see General Rules 1, 2, 3, 4, 5, 14, 15, 19A, and 19B, Section I of the Rules Governing the Loading of Commodities

on Open-Top Cars and Trailers, published by the Association of American Railroads for further details.

4. Tension wire rope with an applicable size come-afong mechanical hoist or equal tensioning device.

7-9

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