Deployable Fire Blanket for Curtain Wall Safing Gaps
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Solution Overview
Problem
Existing fireproofing methods fail to effectively prevent the spread of fire between vertically adjacent floors in buildings with curtain wall constructions, particularly where glass panels can fracture and allow fire to travel upwardly through the safing gap between the floor and the curtain wall.
Innovation Solution
A deployable fire protective curtain system comprising a flexible fire-resistant blanket stored within a retaining chamber, secured to a safing angle member and a cover member, which deploys automatically upon exposure to fire conditions, using fusible links to release the cover and allow the blanket to unfurl and extend downwardly across the curtain wall panel for firestopping, combined with a flexible fire retardant gasket for sealing the safing gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If glass curtain wall panels are used for transparent exterior walls, then aesthetic appearance and natural light transmission are improved, but fire resistance deteriorates because glass can fracture and allow fire to spread vertically between floors
Solution Approach 1:
The fire protection system is divided into separate functional components: a retaining chamber housing, a fusible link release mechanism, and a deployable fire blanket. This segmentation allows the glass curtain wall to maintain its transparent function while the separate fire blanket provides fire resistance, resolving the contradiction between light transmission and fire safety.
Solution Approach 2:
The fire blanket acts as an intermediary protective layer between the fire source and the glass curtain wall panels. When fire threatens, the blanket deploys to block the fire path, protecting the glass panels from direct fire exposure and preventing vertical fire spread, thus maintaining both the aesthetic function and fire safety.
2Reliability
If a deployable fire protective curtain is installed to prevent fire spread, then fire resistance is improved, but device complexity increases due to the retaining chamber, cover member, and release mechanism
Solution Approach 1:
The fire protective system is designed to be self-activating through the fusible link mechanism. When exposed to fire heat, the fusible link automatically melts to release the cover member, which then falls away to deploy the fire blanket. This self-service mechanism eliminates the need for external control systems, sensors, or power sources, significantly reducing device complexity while maintaining reliable fire protection.
Solution Approach 2:
The physical state of the fusible link changes from solid to liquid when exposed to fire temperatures, automatically triggering the release mechanism. This parameter change (temperature-induced phase transition) provides a simple, reliable activation method that reduces mechanical complexity compared to electronic or manual activation systems.
3Reliability
If traditional fireproofing materials are installed in the safing gap between floor and curtain wall, then fire spread prevention is improved, but ease of installation deteriorates due to the need for precise fitting and sealing
Solution Approach 1:
The fire blanket is designed in a dynamic, deployable configuration that transitions from a compact stored state within the retaining chamber to an extended protective state. This dynamic design simplifies installation, as the blanket can be easily positioned in the safing gap and will automatically deploy when needed, eliminating the need for complex pre-configured sealing systems.
Solution Approach 2:
The fire blanket is pre-positioned within the retaining chamber housing during installation, with the fusible link mechanism pre-configured to activate upon fire exposure. This preliminary preparation simplifies the installation process, as the system is ready to deploy immediately when fire threatens, without requiring complex on-site assembly or adjustment.
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
Effectively prevents the upward spread of fire between floors by deploying a fire-resistant blanket across the curtain wall panel, even if the glass panels fracture, and provides a cost-effective and easy-to-install solution with minimal maintenance requirements.
Implementation Method 1
The releasable attachment means is responsive to exposure to fire conditions to disengage the cover member from the safing angle member
Implementation Method 2
the free portion of the curtain blanket to unfurl and move downwardly to a deployed position extending at least partially across the curtain wall panel
Data Source
AI summary
A blanket or curtain of flexible fire retardant material is collapsed and retained within a retaining housing construction positioned adjacent to a curtain wall assembly for firestop sealing thereover. The housing includes a safing angle member secured to the curtain wall assembly and a cover which releases responsive to sensing fire conditions to allow the firestopping blanket to deploy downwardly to extend between curtain wall framing members and be positioned extending across a curtain wall panel for fire protection thereover. Such curtain wall panels are commonly made of glass which tends to fracture during a hot fire. The cover will release the blanket responsive to controlled failure of fusible links which secure the cover to the safing angle member. After deployment the blanket will deflect fire and heat away from the curtain wall panel to prevent the spread of fire to adjacent floors.