Fire Resistant Expansion Joint Segmentation
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Solution Overview
Problem
Existing expansion joint systems for concrete and building structures often fail to adequately accommodate thermal and seismic movements, particularly at transitions around obstructions, leading to premature failure and costly site modifications or re-manufacturing due to the need for complex installation procedures and lack of consideration for irregular joint conditions.
Innovation Solution
A fire and water-resistant expansion joint system with a core infused with a fire retardant and coated with a waterproof elastomer, designed to withstand high temperatures and accommodate various angles, allowing for pre-fabrication and easy installation, minimizing on-site modifications and ensuring performance expectations are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If expansion joint products follow the joint through transition areas (walls, parapets, columns), then the joint can accommodate irregular building geometry, but the homogeneous nature of the product is interrupted creating weak points that lead to premature failure
Solution Approach 1:
The expansion joint system is divided into separate functional components: a continuous homogeneous core material and separate transition pieces. The transition pieces are segmented components that connect to the main joint, allowing the joint to follow irregular geometry while maintaining the homogeneous nature of the core material uninterrupted.
Solution Approach 2:
Transition pieces serve as intermediary elements between the homogeneous expansion joint core and the irregular building geometry. These transition pieces are separately manufactured and installed at transition areas, bridging the gap between the continuous joint and the obstructions without compromising the core material's integrity.
2Adaptability or versatility
If job site modifications are made to accommodate actual expansion joint conditions, then the product can be adapted to specific site requirements, but this requires skilled installers with adequate tools and knowledge to avoid premature failure
Solution Approach 1:
The transition pieces are pre-manufactured with specific geometries designed to accommodate common transition scenarios (walls, parapets, columns). This preliminary preparation eliminates the need for complex on-site modifications, as the transition pieces can be directly installed at the joint transitions without requiring skilled installers to fabricate custom solutions.
3Manufacturing precision
If products are returned to manufacturer for rework or scrapped and re-manufactured, then the product can be corrected to meet specifications, but this results in construction delays and increased costs
Solution Approach 1:
The expansion joint system is segmented into a main joint component and separate transition pieces. This allows the transition pieces to be manufactured independently with high precision according to specific site requirements, eliminating the need to return the entire product to the manufacturer for rework. Only the affected transition pieces need to be custom-manufactured, minimizing construction delays.
4Adaptability or versatility
If transition areas are handled by stitching, gluing, or welding, then the joint can be connected through obstructions, but these methods interrupt the homogeneous nature of the product and create weak points
Solution Approach 1:
Transition pieces act as intermediary components that maintain the homogeneous nature of the expansion joint system while allowing transitions around obstructions. These transition pieces are designed to connect seamlessly with the core material through compression and friction, eliminating the need for stitching, gluing, or welding that would interrupt the homogeneous structure.
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 resists fire and water while accommodating thermal and seismic movements, reducing the risk of premature failure and construction delays by enabling pre-compressed, pre-assembled components that can be easily installed and adapted to complex geometries, thus ensuring durability and cost-effectiveness.
Implementation Method 1
The core is configured to define a profile to facilitate the compression of the expansion joint system when installed between the substrates... the core and the fire retardant are capable of withstanding exposure to a temperature of about 540° C. or greater for about five minutes
Data Source
AI summary
A fire resistant tunnel expansion joint system for installation between substrates of a tunnel. The system includes a fire protection barrier applied at a predetermined thickness to the substrates and a fire resistant tunnel expansion joint. The tunnel expansion joint includes a core and a fire retardant infused into the core. The core is configured to define a profile to facilitate the compression of the tunnel expansion joint when installed between the substrates. The fire protection barrier and the fire resistant tunnel expansion joint are each capable of withstanding exposure to a temperature of at least about 540° C. or greater for about five minutes.