Expansion Joint Seal with Integrated Load Transfer and Fire Resistance
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Solution Overview
Problem
Existing expansion joint systems for construction panels face limitations in supporting transfer loads, resilience, seismic movement, and fire resistance, often requiring rigid extruded rubber or polymer glands that lack flexibility and longevity, and cover plate systems that are costly and pose tripping hazards.
Innovation Solution
An expansion joint system comprising a resiliently compressible foam core with integrated incompressible longitudinal load-transfer members, which are bonded or embedded to provide load transfer without the limitations of extruded glands and anchored cover plates, enhancing flexibility and fire resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid extruded rubber or polymer glands are used to support transfer loads, then load transfer capability is improved, but flexibility and seismic movement capability deteriorate
Solution Approach 1:
The patent uses a composite structure combining a resilient foam core with an integrated load transfer member. The foam core provides flexibility and seismic movement capability while the rigid load transfer member embedded within it provides load transfer capability. This composite approach resolves the contradiction by combining materials with complementary properties in a single integrated system.
2Strength
If anchored cover plates are used to support transfer loads, then load transfer capability is improved, but installation cost and complexity increase
Solution Approach 1:
The patent extracts the load transfer function from the cover plate system and integrates it directly into the expansion joint core. The load transfer member is embedded within the foam core itself, eliminating the need for separate anchored cover plates. This simplifies the overall system and reduces installation complexity while maintaining load transfer capability.
3Strength
If anchored cover plates are used to support transfer loads, then load transfer capability is improved, but the system becomes subject to continuous compression and tension that shortens joint lifespan
Solution Approach 1:
The patent merges the load transfer function with the expansion joint core by embedding the load transfer member within the foam core. This integration allows the load transfer member to move synchronously with the joint's expansion and contraction, eliminating the continuous compression and tension that occur in anchored cover plate systems. The bonded connection between the load transfer member and foam core ensures they move together as a unified system, preserving joint lifespan.
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 supports transfer loads, maintains flexibility and movement, and provides fire resistance without the need for cover plates, reducing installation costs and extending the lifespan of the joint system.
Implementation Method 1
an elongated core of a resiliently compressible foam
Implementation Method 2
one or more incompressible longitudinal load-transfer members bonded to or integrated into the elongated foam core
Implementation Method 3
An intumescent is provided within the foam core
Data Source
AI summary
An expansion joint design for supporting transfer loads. The system includes an elongated core and at least one longitudinal load-transfer member which are bonded together.