Composite Expansion Joint Seal Resolving Movement and Fire Resistance Trade-off
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Solution Overview
Problem
Conventional expansion joint sealants fail to provide comprehensive resistance to water, air, sound, and fire while maintaining compressibility and movement capabilities, often requiring additional fire-resistant coatings that compromise movement range or increasing product cost.
Innovation Solution
An expansion joint seal system featuring an elastic and resilient rectangular prism body with a thin, flexible non-foam member, where the non-foam member is integrated between prism members to provide enhanced water and fire resistance without sacrificing movement capabilities, and optionally includes fire-retardant coatings or fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional expansion joint sealants are used to provide water and air resistance, then sealing function is improved, but movement capabilities and compressibility are reduced
Solution Approach 1:
The patent applies composite materials by combining foam members with non-foam members in a multi-material seal system. The foam members provide compressibility and movement capability, while the non-foam members provide water and fire resistance. This composite approach allows each material to contribute its superior property without compromising the other, resolving the contradiction between sealing performance and movement capability.
Solution Approach 2:
The seal system is segmented into distinct foam members and non-foam members, each performing specific functions. The foam members handle mechanical movement and compression, while the non-foam members handle water and fire resistance. This segmentation allows each component to be optimized for its specific function without compromising overall system performance.
2Object-affected harmful factors
If fire-resistant coatings are applied to expansion joint sealants to improve fire resistance, then fire resistance is improved, but movement range is compromised
Solution Approach 1:
Instead of coating the sealant with fire-resistant materials, the patent uses composite construction where non-foam members inherently provide fire resistance. This approach maintains the movement capabilities of the foam members while providing fire protection through the non-foam component, avoiding the compromise of movement range that occurs with coatings.
Solution Approach 2:
The non-foam members act as intermediaries that provide fire resistance without directly interfering with the movement function of the foam members. The non-foam members are positioned to provide fire protection while allowing the foam members to perform their mechanical movement and compression functions.
3Object-affected harmful factors
If additional fire-resistant impregnations are applied to expansion joint sealants, then fire resistance is improved, but product cost increases
Solution Approach 1:
The patent uses composite materials where non-foam members provide fire resistance as an inherent property rather than requiring additional impregnations or coatings. This approach eliminates the need for extra fire-resistant treatments, reducing manufacturing steps and product cost while maintaining effective fire resistance.
Solution Approach 2:
The non-foam members serve as cost-effective fire-resistant components that replace expensive fire-resistant impregnations and coatings. By using the non-foam members' inherent fire resistance, the system avoids the need for additional costly fire protection treatments.
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 system achieves full or variable resistance to water, air, and sound, retains compressibility, and maintains a high movement range, potentially eliminating the need for additional fire-resistant impregnations, thus improving durability and cost-effectiveness.
Implementation Method 1
Because of the effects of the co-efficient of thermal expansion between similar and dissimilar materials, and external forces such as wind and seismic movement, it is necessary to form a lateral gap or joint between adjacent panels, buildings, or building sections to allow for independent movement
Implementation Method 2
An expansion joint seal system featuring an elastic and resilient rectangular prism body with a thin, flexible non-foam member
Implementation Method 3
the non-foam member is integrated between prism members to provide enhanced water and fire resistance
Implementation Method 4
the non-foam member is integrated between prism members to provide enhanced water and fire resistance
Implementation Method 5
Cavity walls are common in masonry construction, typically to allow for water or moisture to condense or accumulate in the cavity or space between the two exterior walls
Data Source
AI summary
The present disclosure relates generally to systems for creating a joint filler or seal in the gap between adjacent panels or assemblies. The present disclosure is directed to providing an expansion joint seal system which includes a foam associated with a non-foam matrix.