Railroad Vehicle Fire-Resistant Floor Structure With Covered Mounts
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Solution Overview
Problem
Existing fire-resistant floor structures in railroad vehicles suffer from reduced flexibility in underfloor equipment installation due to the thickness of heat-insulating material layers and exposed mounting parts that facilitate heat transfer to the upper surface, compromising fire-resistance performance.
Innovation Solution
A fire-resistant coating is applied to the underframe with a cover covering exposed mounting parts, and a closing plate is interposed between the underfloor equipment and mounting parts, using materials with lower heat conductivity to suppress heat transfer and allow for flexible equipment installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick heat-insulating material layer is used to improve fire-resistance performance, then the temperature rise on the upper surface is delayed, but the space under the middle layer is reduced and flexibility in underfloor equipment installation is deteriorated
Solution Approach 1:
The heat-insulating structure is segmented into two parts: a thin heat-insulating material layer and a reflective sheet. This segmentation allows the reflective sheet to be positioned close to the heat source (underfloor fire) to intercept heat radiation, while the thin insulation layer maintains adequate underfloor space for equipment installation.
Solution Approach 2:
A reflective sheet is introduced as an intermediary element between the heat source and the underframe. This reflective sheet has high heat-reflective properties and redirects heat away from the underframe, improving fire-resistance performance without requiring a thick insulation layer.
2Adaptability or versatility
If mounting parts with exposed grooves are used to facilitate equipment installation, then flexibility in underfloor equipment installation is improved, but heat transfer to the upper surface is accelerated and fire-resistance performance is compromised
Solution Approach 1:
The groove structure is extracted from the mounting part and replaced with a cover component. The cover closes the groove opening, preventing direct heat transfer through the groove while maintaining the mounting functionality through fastening holes in the cover.
Solution Approach 2:
A thin cover plate is used to close the groove opening. This cover is simple in structure with fastening holes for equipment installation, and it effectively blocks heat transfer through the groove without compromising the adaptability of equipment mounting.
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 solution enhances fire-resistance by delaying temperature rise on the upper surface, maintaining structural integrity, and ensuring sufficient evacuation time for passengers and crew members.
Implementation Method 1
the fire-resistant member is fire-resistant coating applied to the lower surface of the underframe... capable of suppressing intrusion of heat to an upper surface of a floor
Implementation Method 2
the mounting part includes an exposed portion exposed from the fire-resistant coating, and is attached with a cover that covers the exposed portion
Data Source
AI summary
A railroad vehicle fire-resistant floor structure with improved fire resistance against underfloor fires includes a mounting part for installing underfloor equipment on the lower surface of an underframe, and a fire-resistant member. The fire-resistant member is a fire-resistant coating applied to the lower surface of the underframe. The fire-resistant coating is preferably a foamable fire-resistant coating. A cover that covers an exposed portion exposed from the fire-resistant coating (foamable fire-resistant coating) is attached to the mounting part. The underfloor equipment is installed at the mounting part with a closing plate sandwiched therebetween.