Expansion Joint Seal Structure for Fire Resistance and ±50% Movement
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Solution Overview
Problem
Conventional expansion joint sealants fail to provide effective long-term water and fire resistance while maintaining compressibility and movement capabilities, often requiring high compression ratios and impregnation with solid fillers, which can lead to fatigue and limited movement ranges.
Innovation Solution
A fire-resistant and water-resistant expansion joint seal system comprising foam members and interspersed intumescent members with a wave-like cross-section, which provides additional load support and allows for greater movement without the need for high compression ratios or extensive impregnation, using intumescent members to enhance fire resistance and foam members for water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional expansion joint sealants use high compression ratios and impregnation with solid fillers to improve water and fire resistance, then fire and water resistance is improved, but fatigue and limited movement ranges occur
Solution Approach 1:
The sealant is divided into multiple foam members interspersed with intumescent members, where each segment can independently compress and recover. This segmentation allows the sealant to maintain fire resistance through the intumescent layers while preserving movement capability through the flexible foam segments, resolving the contradiction between reliability and duration of action.
Solution Approach 2:
The invention uses a composite structure combining foam members (providing flexibility and movement capability) with intumescent members (providing fire and water resistance). This composite material approach allows both fire/water resistance and movement capability to coexist without the fatigue issues associated with solid filler impregnation, addressing the technical contradiction.
2Reliability
If conventional sealants are impregnated with solid fillers to enhance fire resistance, then fire resistance is improved, but compressibility and movement capabilities are reduced
Solution Approach 1:
Rather than uniformly impregnating the entire sealant with solid fillers, the invention segments the fire-resistant function into discrete intumescent members positioned between foam members. This allows the foam to remain highly compressible and mobile while the intumescent members provide fire resistance only where needed for protection.
Solution Approach 2:
Fire resistance is applied locally at specific positions within the sealant structure (at the intumescent members between foam members) rather than throughout the entire material. This local quality approach maintains the overall compressibility and movement capability of the foam while providing fire resistance at critical locations.
3Ease of operation
If expansion joint sealants are designed for long-term durability without impregnation, then movement capability is maintained, but water and fire resistance is insufficient
Solution Approach 1:
The sealant combines foam members (maintaining movement capability) with interspersed intumescent members (providing water and fire resistance). This composite structure achieves both long-term durability through the protective intumescent layers and sustained movement capability through the flexible foam segments without requiring solid filler impregnation.
Solution Approach 2:
The intumescent members act as intermediary elements between the foam members, providing water and fire resistance while allowing the foam to maintain its movement capability. These intermediary layers protect the foam from direct water and fire exposure without restricting its compressibility or movement function.
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 effectively seals against water and fire, maintains compressibility over time, and supports movement up to +/−50% or more, meeting stringent fire and water resistance tests without the need for extensive impregnation or high compression ratios, thus addressing the limitations of existing technologies.
Implementation Method 1
each intumescent member is interspersed between two foam members or within a foam member... using intumescent members to enhance fire resistance
Implementation Method 2
foam members for water resistance... The system effectively seals against water and fire
Implementation Method 3
intumescent members with a wave-like cross-section, which provides additional load support and allows for greater movement
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. A fire-resistant and water-resistant expansion joint seal is provided which includes one or more foam members and a plurality of intumescent members within the foam member or members to provide a spring recovery force and fire resistance.