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Wood pole reinforcement.

Pole reinforcement technology has developed several methods of pole repair which can restore poles to their original groundline strength. Engineering personnel should evaluate the selected method to ensure that the proposed installation is adequate.

a. Stub pole. A length of pole of the same size as the existing pole, and long enough to extend from the butt of the pole to about 5 feet (1.5 meters) above the ground line, is set flush alongside the existing pole. Follow criteria for setting a new pole and band it to the existing pole at the top and about 15 inches (400 millimeters) above the ground line. Figure 4-7 shows details for fastening the stub pole to an existing pole.

b. Steel reinforcing. If several poles need reinforcing, steel reinforcing may be more economical than the use of stub poles. The steel reinforcement consists of a "C" shaped galvanized steel section (as shown in figure 4-8), which is pneumatically driven to below the pole butt and then strapped to the existing pole. The equipment for driving the reinforcing is specifically designed for the purpose, but its use will be more economical than digging Holes for several stub poles. Although the steel reinforcing can be installed by in-house forces, it would probably be advantageous to have this work done by a firm specializing in this service. Steel reinforcing also provides extra protection from vehicles in congested areas. Engineering is required to ensure proper installation since the overall strength of the steel truss and pole combination depends on the strength of the banding system.

4-10

TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

WIRE CLAMP STAPLE

DIRECTION OF LEAD

TENSION STRAND WiTH

DOUBLE: ARMING GOlT

(CUT OFF AFTER INSTALLATION)

STUBBING

STRAND

WASHER

WRAP WITH

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