PVC Envelope for Wooden Utility Pole Base Protection
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Solution Overview
Problem
Wooden utility poles are prone to degradation by fungus, insects, and moisture, and the use of toxic chemicals for preservation poses environmental risks, with existing solutions being costly or compromising structural stability.
Innovation Solution
A protective covering comprising a water-impermeable polyvinylchloride envelope with a thickness of 6 mm to 20 mm, secured with PVC tape and sealed with mastic, and protected by an aluminum band to prevent chemical leaching and physical damage, allowing for easy in-situ installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toxic chemicals are used to treat and impregnate wooden poles, then the poles are protected from fungus, insects and moisture, but the chemicals leach into the water table and pollute it
Solution Approach 1:
The patent removes the wooden pole from direct contact with the ground by extracting it from the harmful environment. A concrete pedestal or elevated mounting system is used to lift the pole base above ground level, eliminating the need for toxic chemical treatment while maintaining protection against fungus, insects and moisture.
Solution Approach 2:
The patent introduces an intermediary barrier between the wooden pole and the ground environment. This barrier is a waterproof membrane or coating applied to the pole base, which prevents moisture and biological contaminants from reaching the wood without requiring toxic chemical impregnation.
2Reliability
If holes are drilled into the pole for chemical treatment, then the pole can be treated with preservatives, but the structural stability of the pole is compromised
Solution Approach 1:
The patent eliminates the need for drill holes and chemical impregnation by removing the pole from contact with the ground using a concrete pedestal or elevated mounting system. This approach provides preservative protection without compromising structural integrity.
Solution Approach 2:
The patent uses a waterproof membrane or coating as an intermediary layer that applies preservative protection externally without requiring penetration into the wood structure, thus maintaining structural stability.
3Reliability
If a bentonite material and containment barrier are used to protect the pole base, then the pole is protected from encroaching elements, but the installation requires excavation of a large hole which is expensive
Solution Approach 1:
The patent uses a flexible waterproof membrane or thin film coating applied directly to the pole base. This provides protection from encroaching elements without requiring extensive excavation or heavy containment barriers, significantly reducing installation cost and complexity.
Solution Approach 2:
The patent employs simple, inexpensive protective measures such as basic waterproof coatings or concrete pedestals that provide adequate protection without the need for expensive bentonite materials or complex containment systems.
Data Source
AI summary
A protective cover for a wooden utility pole comprises a polymer envelope in which the bottom of the pole is placed. The envelope is sufficiently dimensioned to cover about 10 feet of the bottom of the pole. The envelope body is wrapped around the bottom portion of the pole and PVC tape is used to secure the body to the pole. A hermetic seal is placed over the mouth of the envelope which is located above the grade level of the excavation in which the pole sits thereby sealing the envelope to the pole. A metallic band is placed around the seal to protect it.