Radius Vtfr

Head 1/2 mild steel plate welded to end of pipe

Mild steel pipe for handles

Mild steel guide pipe

Sfes Radius taT^

Section

Handle to guide pipe

Figure 5-10. Expedient Picket Driver

(3) Arctic adapter. For erecting barbed wire obstacles with U-shaped drive pickets under conditions where frozen ground prevents driving the pickets, an Arctic adapter is available for anchoring the pickets. The adapter is made of steel and consists of a baseplate equipped with an adjustable channel receptacle and two anchor pins. It is anchored by driving the anchor pins through holes in the baseplate into the ground. One anchor pin drive sleeve with a driving pin is provided with each 20 adapters to facilitate anchor pin emplacement. When adapters are not available, a hole can be started with a pick and the picket can be frozen in place by pouring water and snow into the hole.

b. Wooden Picket. Expedient wooden pickets (Figure 5-9) of several types may be used.

(1) Round poles. Round poles 10 centimeters in diameter are cut to standard picket lengths, sharpened on one end, and driven with a maul. The pickets are used without peeling the bark to prevent the wire from sliding on the picket and to simplify camouflage. Longer pickets are required in loose or sandy soil or when driving through a snow cover. The driving of wooden pickets is not as noisy as the driving of steel pickets, and the noise can be reduced further by fastening a section of tire tread over the face of the hammer or maul. For driving in hard earth, picket tops are wrapped with wire to avoid splitting. Pickets of hardwood, properly installed, are sturdy and rigid.

(2) Dimension lumber. Dimension lumber ripped to a square cross section may be used instead of round poles. This is equally satisfactory except that is more difficult to camouflage. Such pickets may be camouflaged by painting before driving.

(3) Trees and stumps. Standing trees and stumps may be used as pickets when their location permits.

5-5. Concertina Fencing. Concertina wire is a freestanding method of deploying wire obstacles. Standard barbed wire and barbed steel tape are the two types of concertina.

a. Standard Barbed Wire Concertina. The standard barbed wire concertina (Figure 5-11) is a commercially manufactured barbed wire obstacle made of a roll of singlestrand, high-strength, spring-steel wire with 4-point barbs attached at 5-centimeter spacing. Wires forming the coils are clipped together at intervals so the concertina opens to a cylindrical shape of 5 to 15 meters long (depending on structure and build of opening) and 90 centimeters in diameter. The 5-meter length prevents smaller enemy personnel from crawling through the wire, because the coils are closer together. Tanglefoot should also be employed in conjunction with the wire to further increase the effectiveness of the barrier. The concertina is easily opened and collapsed and can be used repeatedly, because the wire returns to its original shape after a crushing force is applied and then removed. The wire is much harder to cut than standard barbed wire. The concertina weighs 25.4 kilograms.

Extended length 5 to 15 m

Diameter open 90 cm

Figure 5-11. Standard Barbed Wire Concertina

Extended length 5 to 15 m

Closed thickness 15 cm

Closed thickness 15 cm

Diameter open 90 cm

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