Composite Fire Shelter Structure for Prolonged Heat Exposure
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Solution Overview
Problem
There is a need for a portable fire shelter that can protect multiple people for several hours from intense heat and fire, especially in densely populated areas where fires can trap individuals for extended periods without adequate escape time.
Innovation Solution
A shelter with walls and a roof made of a three-dimensional metal matrix embedded in insulation, enveloped by a continuous one-piece concrete layer, providing a fire-resistant seal that can withstand temperatures over 700 degrees Fahrenheit for at least 4 hours, combined with a fire-resistant door and a compressed air system for maintaining a safe internal environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a portable fire shelter is designed to protect multiple people for several hours from intense heat and fire, then the protection duration and temperature resistance are improved, but the shelter weight and structural complexity increase
Solution Approach 1:
The shelter employs a composite wall structure consisting of an outer concrete layer (2-4 inches thick) providing fire resistance, an intermediate insulation layer (3-6 inches thick) of materials like fiberglass or foam, and an inner metal matrix layer (1-2 inches thick) of stainless steel or aluminum for structural integrity. This multi-material composite approach achieves 4-hour protection at temperatures exceeding 700°F while managing the weight through material optimization.
2Reliability
If a continuous one-piece concrete envelope is used to envelop the roof and walls, then the fire-resistant seal and structural integrity are improved, but the manufacturing complexity and construction difficulty increase
Solution Approach 1:
The concrete envelope is constructed by pouring concrete against temporary formwork that defines the shelter's exterior shape. The formwork is segmented into manageable sections that can be assembled and removed in pieces, allowing the continuous concrete envelope to be manufactured through a series of discrete, manageable pouring operations rather than requiring a single complex monolithic pour.
3Temperature
If the shelter is designed to withstand temperatures over 700 degrees Fahrenheit for at least 4 hours, then the temperature resistance and safety are improved, but the material requirements and cost increase
Solution Approach 1:
The shelter employs differentiated material thicknesses and types across different structural elements. The concrete envelope thickness varies from 2-4 inches depending on the wall or roof location, the insulation layer is concentrated at the concrete-metal interface where heat transfer is most critical, and the metal matrix thickness is optimized to 1-2 inches for structural integrity rather than uniform fire resistance. This local optimization reduces total material quantity while maintaining 700°F resistance for 4 hours.
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 shelter effectively protects individuals from extreme heat and fire for extended periods by maintaining a safe internal environment, ensuring survival through a fire-resistant structure and controlled air supply.
Implementation Method 1
a three-dimensional metal matrix embedded in insulation with concrete positioned about the front wall, the right wall, the left wall, the rear wall and the roof
Implementation Method 2
a three-dimensional metal matrix embedded in insulation
Implementation Method 3
opening valves of compressed air cylinders in the shelter to flow the compressed air from the cylinders into the chamber of the shelter
Data Source
AI summary
A shelter for protecting a person from fire and heat. The shelter has a roof, and front, right, left, and rear walls, each of which having a core made of a three-dimensional metal matrix embedded in insulation with concrete positioned about the walls and the roof. The concrete forming a continuous one-piece concrete layer enveloping the roof, and the walls, down to the base. The concrete layer forming a fire-resistant seal with the base about the walls, and roof which protects the person in the chamber from fire and heat at least more than 600 degrees Fahrenheit for at least 2 hours. A method for protecting a person from fire and heat. A method for building a shelter for protecting a person from fire and heat external to the shelter.