Fire resistant composite pole
AssigneeValmont Industries, Inc.
InventorRobert Paulin
Life of this patent
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Abstract
The present invention provides an improved fire resistant composite pole and a method for producing the same. In accordance with preferred embodiments, the composite utility pole of the present invention includes a composite structure having integrally bonded layers of resin impregnated fiberglass extending along the length of the pole. According to a preferred embodiment, the composite structure of the pole includes an intumescent layer which includes: high temperature mineral fibers, exfoliating graphite, organic binders. and alumina trihydrate (ATH).
Claims22
A method for forming a composite pole, the method comprising:
- rotating a mandrel between a first support and a second support;
- moving a delivery ring back and forth across the mandrel;
- laying down a resin layer and a layer of fiberglass rovings in a helical fashion and at prescribed angles relative to the main axis of the mandrel;
- wherein the resin and fiberglass layers are applied using filament winding;
- wherein the fireproof layer is wound into the applied layers;
- wherein the initial layer of fiberglass rovings is applied at an initial angle;
- wherein the initial comprises an angle between 0°-90°;
- wherein the initial layer of fiberglass rovings are applied in 5-15 bands at the initial angle to produce a first layer length of 360″;
- wherein the first layer ends approximately 216″ from the top from the mandrel;
- changing the angle of the mandrel to a second angle;
- wherein the angle of the mandrel is moved 1°-30° to produce the second angle;
- and
- applying a second layer of fiberglass rovings onto the mandrel;
- wherein the second layer of fiberglass rovings are applied in 5-15 bands to produce a second layer length of 390″;
- wherein the second layer ends approximately 192″ from the top from the mandrel.
Dependencies are inferred from the claim text.