Concrete Pathway Joint Geometry for Load Transfer and Crack Control
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Solution Overview
Problem
Existing concrete joint systems are prone to unwanted cracking and unevenness due to soil movement and tree roots, and are often expensive, especially in situations requiring multiple joints like footpaths.
Innovation Solution
A jointing apparatus with a barrier element that allows for relative rotation and vertical load transfer between concrete panels, featuring upper and lower round surfaces for opposing directions, transverse sections for force transfer, and a unitary extrusion design made from corrosion-free plastic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing keyed joints in concrete are used to enable load transfer between concrete members, then load transfer capability is improved, but the joints are still prone to unwanted cracking and unevenness due to soil movement and tree roots
Solution Approach 1:
The jointing element incorporates an upper section and lower section that can rotate relative to each other in opposite directions, creating a dynamic articulation mechanism. This allows the joint to adapt to soil movement and tree root expansion by permitting controlled rotation of concrete panels while maintaining load transfer through the transverse section, thereby resolving the contradiction between load transfer capability and resistance to cracking
Solution Approach 2:
The jointing element changes the mechanical parameters of the joint by providing specific geometric features including upper and lower round surfaces for rotation and a transverse section for load transfer. These parameter changes enable the joint to simultaneously provide load transfer capability and accommodate movement without cracking, improving both strength and reliability
2Adaptability or versatility
If traditional concrete joint systems are used to provide expansion joints for breaks in concrete slabs, then thermal expansion and contraction are accommodated, but the systems are prohibitively expensive for situations requiring many joints such as footpaths
Solution Approach 1:
The jointing element is designed as a segmented structure with distinct upper section, lower section, and transverse section, allowing it to be manufactured as a modular component. This segmentation enables cost-effective production and installation, particularly for situations requiring multiple joints along footpaths, while maintaining the ability to accommodate thermal expansion and contraction
Solution Approach 2:
The jointing element serves multiple functions simultaneously: it provides expansion joint capabilities for thermal movement, load transfer through the transverse section, and articulation through the rotating upper and lower sections. This multi-functionality eliminates the need for separate components, reducing overall cost while maintaining adaptability to various movement types
Data Source
AI summary
An apparatus for forming a joint between concrete panels to be cast, the apparatus including an element forming a barrier having an upper section providing an upper round surface for relative rotation of the panels in a first direction and a lower section providing a lower round surface for relative rotation of the panels in a second direction opposite to the first direction.