Embeddable Breakaway Utility Pole Weld Joint Design
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Solution Overview
Problem
Fiberglass breakaway utility poles are susceptible to deterioration from UV radiation, requiring a UV-resistant coating that can be damaged, leading to potential failure under vehicular impact.
Innovation Solution
A breakaway utility pole design featuring metallic upper and lower pole pieces with a weld joint, embedded in concrete or soil, where the joint is strong enough for wind loads but weak enough to break under vehicular impact, using aluminum alloys like 6063-T6, and optionally incorporating a backer ring or plate for enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fiberglass is used for the utility pole, then the pole can be made lightweight and corrosion-resistant, but the pole becomes susceptible to UV radiation deterioration requiring additional protective coating
Solution Approach 1:
The patent employs composite construction by joining metallic pole pieces (aluminum or steel) with concrete foundation. This composite approach provides both the lightweight/corrosion-resistant properties of metal and the UV stability/concrete durability, eliminating the need for additional UV protective coatings while maintaining structural integrity
Solution Approach 2:
The invention changes the material parameter from fiberglass to metal alloys (aluminum 6063-T6 or steel) that inherently resist UV degradation. By selecting materials with different inherent properties—specifically metals that do not require UV protective coatings—the patent resolves the contradiction between corrosion resistance and UV susceptibility
2Strength
If the pole joint is made strong to withstand wind loads, then structural integrity is improved, but the pole cannot break away under vehicular impact
Solution Approach 1:
The patent divides the pole into separate modular sections (upper pole piece, lower pole piece, and concrete foundation) connected by identifiable joints. The breakaway joint between the lower pole piece and concrete foundation is specifically designed with controlled strength characteristics—strong enough to resist wind loads but weak enough to fail under vehicular impact, achieving both structural integrity and breakaway capability through segmented design
Solution Approach 2:
The invention applies different strength characteristics to different parts of the pole structure. The pole pieces themselves are made with high strength to withstand environmental loads, while the connection joint between the lower pole piece and concrete foundation is intentionally designed with reduced strength (through controlled embedment depth, joint geometry, or material properties) to serve as a predetermined failure point under impact loads
3Strength
If the lower pole piece is embedded deeper in concrete, then anchorage strength is improved, but the pole requires more concrete and installation complexity
Solution Approach 1:
The patent employs partial embedment of the lower pole piece into the concrete foundation rather than full embedment. The embedment depth is optimized to provide sufficient anchorage strength for wind loads while avoiding excessive concrete requirements and installation complexity. This partial action approach achieves the necessary strength without the diminishing returns of deeper embedment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design provides a durable and impact-resistant utility pole that withstands wind loads while ensuring the pole can break away under vehicular impact, avoiding the UV-related deterioration issues of fiberglass poles.
Implementation Method 1
a weld joint between a lower pole piece and an upper pole piece
Data Source
AI summary
An embeddable breakaway utility pole comprises separate upper and lower aluminum pole pieces, wherein the lower pole piece is to be embedded below ground surface. The upper and lower pole pieces are interconnected by a weld which defines a breakaway zone enabling the upper pole piece to break off the lower pole piece in response to vehicular impact. The weld can be connected to a backer ring which provides a guide surface that axially aligns the pole pieces. Alternatively, the pole can be formed of a single pole piece which is welded between its ends to form a weakened region that defines the breakaway zone.