Design of a Composite Pole Laminate

Procedures were developed for preparing and testing composite poles consisting of inferior woods wrapped with glass cloth and treated with epoxy resin. Either seven or 10 layers have been used, with the first and every third layer being a circumferential wrap. Other layers are placed longitudinally or as a balanced helical coil. The peeled, green, pole is coated with epoxy and then wrapped with either dry or prepeg tape. On a pole 35 feet long and having an 8-inch butt diameter, an 11-foot-long jacket is applied starting 3 feet from the butt. Curing is done by application of heat and circumferential pressure. Strength tests and mathematical analyses show that the jacket increases the modulus of rupture by about 40 percent. This results from reducing the load on the wood fibers until the jacket fails by compressive buckling. Laminated and untreated poles have been placed in alluvial soil for testing resistance to weathering and biodegradation under conditions faced by power transmission line poles.

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