Composite Wood-Plastic Beam with Twisted-Tooth Connectors
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Solution Overview
Problem
The construction industry faces challenges in creating cost-effective composite assemblies for building structures that comply with EPA regulations, particularly due to the ban on using treated wood in residential applications and the need for materials that prevent decay and splitting in wood components.
Innovation Solution
A composite assembly is developed using a dual-sided connector with twisted teeth that embed into wood boards, providing strength and preventing splitting, and featuring layers of wood and non-wood materials like plastic, with staggered joints for enhanced structural integrity and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If treated wood is used for the lower elongated portion to prevent decay, then the durability and decay resistance is improved, but the compliance with EPA regulations deteriorates
Solution Approach 1:
The patent applies composite materials by combining wood for the upper elongated portion with non-wood materials (such as plastic or metal) for the lower elongated portion. This composite construction allows the wood portion to maintain its natural decay resistance while the non-wood portion provides the required durability without containing banned chemical treatments, thus achieving both decay resistance and EPA compliance.
2Shape
If wood is used for the lower elongated portion to maintain aesthetic appeal, then the visual appearance is improved, but the decay resistance and durability deteriorate
Solution Approach 1:
The patent applies local quality by differentiating the material properties at different locations along the vertical assembly. The upper portion uses wood to provide aesthetic appeal and visual continuity with traditional architecture, while the lower portion uses non-wood materials to provide enhanced durability and decay resistance where it is most needed, thus achieving both aesthetic appeal and reliability through location-specific material selection.
3Strength
If connector devices are used to join wood boards into composite assemblies, then the structural strength is improved, but the risk of splitting and structural failure deteriorates
Solution Approach 1:
The patent applies this principle by using elongated wraps that conform to and embrace the curved surfaces of adjacent wood boards. These wraps act as flexible binding elements that distribute connection forces along the length of the boards rather than concentrating stress at discrete connector points, thereby maintaining structural strength while preventing the splitting that occurs with rigid connector devices.
Data Source
AI summary
A composite assembly includes a series of elongated layers joined lengthwise thereof. At least two of the elongated layers each have an upper elongated portion and a lower elongated portion secured together in an end-to-end relationship at a joint therebetween by a connector arrangement. The upper elongated portion is constructed of a wood material, and the lower elongated portion is constructed of a non-wood material. The lower elongated portion may have a reinforcing rod therein.