Building Panel Mechanical Fastening for Heat Resistance
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Solution Overview
Problem
Adhesively bonded building panels used in walls and ceilings can separate and fall when exposed to high heat, posing a risk of injury to firefighters and evacuees due to the melting or disintegration of adhesives, especially in environments like underground railway stations.
Innovation Solution
Incorporating a mechanical fastening device that extends between the first and second plates, or between the plates and an attachment member, to securely fasten the panels together, preventing detachment even if the adhesive fails, and designing this device to be non-visible from the exterior surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesively bonded building panels are used to achieve rapid and inexpensive assembly with aesthetically acceptable surfaces, then ease of manufacture and aesthetic appearance are improved, but reliability under high heat conditions deteriorates as adhesive melts or disintegrates causing panel separation
Solution Approach 1:
The building panel is divided into multiple layers (front plate, core structure, rear plate) that are adhesively bonded together. This segmentation allows each component to be manufactured separately and then assembled, achieving rapid and inexpensive assembly while maintaining aesthetic appearance. The segmented structure also enables the incorporation of mechanical fastening devices within the panel layers without compromising the visible exterior surface.
Solution Approach 2:
Mechanical fastening devices (such as pins, rivets, or chemical anchors) are introduced as intermediary elements between the front plate, core structure, and rear plate. These mechanical fasteners serve as a backup bonding mechanism that remains effective under high heat conditions when adhesive fails. The mechanical fastening devices are positioned within the panel structure (not visible from the exterior) and provide redundant attachment to prevent panel separation during fire events.
2Reliability
If mechanical fastening devices are added to prevent panel separation under heat, then reliability under high heat is improved, but device complexity increases due to additional components
Solution Approach 1:
The mechanical fastening devices are merged with the adhesive bonding system to form a hybrid attachment mechanism. The mechanical fasteners are integrated within the panel structure (embedded in the core structure or positioned between layers) and work in conjunction with the adhesive bonding. This merging approach provides reliable high-heat performance while minimizing the visible impact and overall complexity of the assembly.
Solution Approach 2:
The mechanical fastening devices are extracted from the visible exterior surface and positioned within the internal structure of the panel (between the front plate and rear plate, or embedded in the core structure). This extraction ensures that the mechanical fasteners do not compromise the aesthetic appearance of the front plate while still providing the necessary structural reinforcement for high-heat reliability.
3Shape
If adhesive bonding is used to create aesthetically appealing surfaces free from visible fasteners, then aesthetic appearance is improved, but safety under fire conditions deteriorates as adhesive fails causing panels to fall
Solution Approach 1:
Mechanical fastening devices are incorporated into the panel structure beforehand as a safety backup against adhesive failure. These mechanical fasteners are pre-installed within the panel layers (not visible from the exterior) and provide a fail-safe attachment mechanism that prevents panel detachment during fire events, cushioning against the harmful effect of adhesive disintegration.
Solution Approach 2:
The building panel employs a composite attachment system combining organic adhesive material with inorganic mechanical fastening elements. This composite approach leverages the advantages of both bonding methods: adhesive provides aesthetic surface quality and initial bonding, while mechanical fasteners provide heat-resistant structural support and fail-safe attachment, creating a synergistic system that addresses both aesthetic and safety requirements.
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
Ensures that adhesively bonded building panels remain securely attached to walls and ceilings during high-heat events, preventing panel components from falling and causing injuries, while maintaining an aesthetically appealing exterior surface.
Implementation Method 1
a core structure positioned between the first plate and the second plate and being adhesively bonded to the first plate and the second plate
Data Source
AI summary
A building panel for a wall or ceiling is provided. The panel comprises a first plate forming a front of the panel, a second plate forming a rear of the panel, and a core structure positioned between the first plate and the second plate and being adhesively bonded to the first plate and the second plate. The panel further comprises an attachment member for attaching the panel to a wall or ceiling or to a structure attached to a wall or ceiling, and a mechanical fastening device which extends between and mechanically fastens the first plate to the second plate and/or the attachment member.