Expansion Joint Seal with Segmented Fire and Water Layers
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Solution Overview
Problem
Conventional expansion joint sealants fail to provide effective resistance to both water and fire while maintaining compressibility over time, often requiring high-density impregnation or compression that increases costs and limits movement capabilities.
Innovation Solution
The expansion joint seal system comprises two resiliently compressible body members with flexible sheeting on either side, providing a spring force to resist compression and allow for expansion, while avoiding the need for extensive impregnation or high-density fillers, and can include additional components for enhanced water and fire resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-density impregnation or compression is used to provide effective water and fire resistance, then water and fire resistance is improved, but movement capabilities and compressibility are limited
Solution Approach 1:
The expansion joint seal is divided into multiple layers with distinct functions: a resilient body member for compressibility and movement, a fire-resistant layer for flame protection, and a waterproof layer for water resistance. This segmentation allows each layer to optimize its specific function without compromising the others, enabling the system to maintain movement capabilities while providing effective water and fire resistance.
Solution Approach 2:
The patent uses composite material construction by combining different materials with complementary properties: resilient elastomeric materials for compressibility, fire-resistant materials for flame penetration delay, and waterproof materials for water resistance. This composite approach allows the system to achieve multiple performance requirements simultaneously without requiring high-density impregnation that would limit movement.
2Reliability
If high-density impregnation or compression is used to provide effective water and fire resistance, then water and fire resistance is improved, but cost increases
Solution Approach 1:
By segmenting the seal into functional layers, each layer can use cost-effective materials optimized for its specific purpose rather than requiring expensive high-density impregnation throughout the entire structure. The resilient body member uses economical elastomeric materials, while fire and water resistance are provided by specialized layers only where needed.
Solution Approach 2:
The composite material approach allows selection of cost-effective materials for each function: resilient elastomers for the body member, cost-efficient fire-resistant materials for the fire layer, and economical waterproof materials for the water layer. This avoids the high cost of dense impregnation while achieving reliable water and fire resistance.
3Reliability
If extensive impregnation or high-density fillers are used, then water and fire resistance is improved, but compressibility is reduced
Solution Approach 1:
The segmentation separates the compressibility function (handled by the resilient body member with high elastomeric content) from the protection functions (handled by the fire-resistant and waterproof layers). This allows the body member to maintain high compressibility without impregnation, while the protective layers provide water and fire resistance.
Solution Approach 2:
The composite structure uses materials with appropriate properties in each layer: highly compressible elastomeric materials for the body member that require no impregnation, and specialized materials for fire and water resistance in the protective layers. This avoids reducing compressibility while achieving effective protection.
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
This design effectively seals against water penetration and delays flame penetration, maintaining compressibility and movement capabilities, while reducing the need for costly impregnation and fillers, thus offering improved durability and cost-effectiveness.
Implementation Method 1
two resiliently compressible body members with flexible sheeting on either side, providing a spring force to resist compression and allow for expansion
Data Source
AI summary
The present disclosure relates generally to systems for providing a durable water-resistant and fire-resistant foam-based seal in the joint between adjacent panels. An expansion joint seal, which may be fire-resistant and/or water-resistant, is provided which includes one or more body members, a fire retardant member, which may be of an intumescent member, interspersed within the body member or members, a plurality of resilient members to provide a spring recovery force and fire resistance, and a connector of at least two of the resilient members, which connect each of the resilient members to a cover plant or may connect the two resilient members to one another.