Fire-Resistant Skylight Glazing Bead Thermal Expansion Control
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Solution Overview
Problem
Conventional fire-resistant skylights have limited fire resistance duration and fail to effectively contain flames and smoke, necessitating an enhancement in their design to maintain sealing and thermal insulation under high temperatures.
Innovation Solution
A fire-resistant skylight design featuring a curb with a base, rim, and body connected by a fixing device using adhesive and rivets, along with a glazing bead made from steel sheet, which maintains the glazing in place and controls thermal expansion to prevent openings and ensure fluid tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional skylight designs are used, then the structure is simple and easy to manufacture, but the fire resistance duration is limited
Solution Approach 1:
The skylight employs composite construction combining metal curb elements, fire-resistant glazing materials, and intumescent sealing systems. The body comprises a first metal element and a second metal element joined through rivets and adhesive, creating a composite structure that maintains integrity at high temperatures and extends fire resistance duration beyond conventional single-material designs.
Solution Approach 2:
The design implements nested sealing systems where a first seal and a second seal are positioned within the curb structure at different levels. The spacers are nested between the glazing bead and the curb, creating multiple barrier layers that work together to contain flames and smoke, thereby extending fire resistance without requiring a complete structural redesign.
2Duration of action of moving object
If the skylight structure is made more robust to improve fire resistance, then fire resistance duration increases, but manufacturing complexity increases
Solution Approach 1:
The skylight is divided into discrete, modular components including the first metal element, second metal element, glazing bead, spacers, and multiple seals. These segmented elements are designed to be assembled through standardized connections using rivets and adhesive, allowing robust fire-resistant construction while maintaining manufacturing efficiency through modular assembly rather than complex monolithic fabrication.
Solution Approach 2:
The spacers are pre-positioned between the glazing bead and the curb during assembly, and the seals are pre-installed in their respective positions within the body structure. This preliminary positioning of critical fire-resistant elements ensures proper alignment and spacing without requiring complex adjustment procedures during final assembly, thereby maintaining ease of manufacture while achieving enhanced fire resistance.
3Strength
If fixed rigid connections are used to ensure structural integrity, then strength is improved, but thermal expansion control is reduced
Solution Approach 1:
The connection system transitions from purely rigid mechanical fastening to a hybrid system combining rivets with flexible adhesive bonding. The adhesive layer acts as a compliant element that maintains structural strength while accommodating thermal expansion and contraction of the metal elements during fire exposure, thereby preserving both structural integrity and thermal adaptability.
Solution Approach 2:
The adhesive serves as an intermediary material between the rigid rivet connections and the metal elements subject to thermal expansion. This intermediary layer absorbs dimensional changes through its viscoelastic properties, allowing the rigid rivets to maintain structural strength while the adhesive compensates for thermal movement, thus resolving the contradiction between strength and thermal adaptability.
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 enhanced skylight design significantly extends fire resistance duration by maintaining a seal against flames and smoke, ensuring watertightness and thermal insulation, while allowing for controlled thermal expansion of materials to prevent damage and ensure structural integrity.
Implementation Method 1
the fixing device comprising glue and a rivet
Implementation Method 2
the fixing device comprising glue and a rivet
Implementation Method 3
a glazing bead made from steel sheet, which maintains the glazing in place and controls thermal expansion to prevent openings
Implementation Method 4
ensuring watertightness and thermal insulation
Data Source
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AI summary
The present description relates to a skylight comprising a curb (3), a glazing (2) and a glazing bead (4), the glazing (2) being positioned between the glazing bead (4) and the curb (3), the skylight further comprising a fixing system intended to fix the glazing bead (4) to the curb (3), the fixing system comprising a spacer (6) intended to be arranged between the glazing bead (4) and the curb (3), the spacer (6) being configured to limit the forces applied to the glazing (2) by the glazing bead (4) and/or by the curb (3).