Expansion Joint Seal Self-Centering Foam Mechanism
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Solution Overview
Problem
Existing expansion joint sealing systems face challenges in maintaining the coverplate centered across gaps during thermal cycling and seismic movements without complex mechanical devices or preventing water ingress, while ensuring a smooth transition for pedestrian or vehicular traffic.
Innovation Solution
An expansion joint seal comprising a coverplate with a snap-fit connecting member, a central spine, and expandable and compressible foam seals positioned on either side of the spine, which self-centers and maintains the coverplate's position across the gap, eliminating the need for additional fasteners and reducing installation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If complex mechanical centering devices or elastic elements are used to maintain the coverplate centered across the gap, then the coverplate remains centered during thermal cycling and seismic movements, but the device complexity increases
Solution Approach 1:
The patent removes complex mechanical centering devices and elastic elements from the system. Instead, it uses a foam seal member that naturally provides centering function through its compressible and expandable properties, eliminating the need for additional mechanical components while maintaining coverplate stability.
Solution Approach 2:
The patent changes the physical state and properties of the sealing material from rigid mechanical elements to a compressible and expandable foam material. This parameter change allows the foam seal member to adapt to gap variations through compression and expansion, providing automatic centering without complex mechanics.
2Reliability
If traditional sealing systems are used, then water ingress prevention is achieved, but additional fasteners and complex installation are required
Solution Approach 1:
The patent combines multiple functions into a single foam seal member: sealing, centering, and positioning. This merged component eliminates the need for separate fasteners and mechanical centering devices, simplifying installation while maintaining reliable water ingress prevention through the foam's inherent sealing properties.
Solution Approach 2:
The foam seal member is self-positioning and self-centering through its compressible and expandable properties. It automatically adjusts to maintain the coverplate centered and provides sealing without requiring additional fasteners or complex installation procedures, making the system self-sufficient.
3Adaptability or versatility
If the foam seal member is compressible and expandable, then it provides self-centering and maintains seal integrity, but the structural rigidity may be reduced
Solution Approach 1:
The patent selects a foam material with specific compressible and expandable parameters that provide adequate flexibility for self-centering while maintaining sufficient structural rigidity to support the coverplate and resist water ingress. The foam's density and cell structure are optimized to balance these opposing requirements.
Solution Approach 2:
The foam seal member can be formulated as a composite material combining different foam types or incorporating reinforcing elements within the foam structure. This composite approach enhances structural rigidity while preserving the compressible and expandable properties needed for self-centering and sealing functions.
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 solution effectively maintains the coverplate centered across expansion joints during thermal and seismic movements, prevents disengagement, and ensures a watertight seal, while providing a smooth transition for traffic and resisting water ingress.
Implementation Method 1
expandable and compressible foam seal
Implementation Method 2
expandable and compressible foam seal
Data Source
AI summary
An expansion joint seal for sealing a gap between two structural members that includes a coverplate, a snap-fit connector extending downwardly from the coverplate, a central spine connected to the coverplate with a snap-fit connector and extending downwardly from the connector, and foam seal members engaged with the central spine of the expansion joint seal. An expansion joint including spaced-apart structural members defining a gap between the spaced-apart members and the expansion joint seal.