Modular Cable Tray Firestop with Intumescent Seals
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Solution Overview
Problem
Conventional firestopping methods for cable trays are inefficient, time-consuming, and often compromise the integrity of the fire barrier when removed or replaced, failing to effectively prevent fire spread through construction openings.
Innovation Solution
A firestopping apparatus comprising interconnected housing members with intumescent material and compressible foam pads that expand to seal around cable trays, providing a robust and adjustable fire barrier that complements the shape of the tray and minimizes smoke, air, and noise passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional firestop products (mortars, sealants, pillows, bags, or blocks) are used to firestop cable trays, then fire barrier protection is provided, but the installation process is time-consuming and the opening integrity is compromised when materials are removed or replaced
Solution Approach 1:
The firestop device is divided into multiple modular components: a U-shaped channel member that fits around the cable tray, removable plugs for individual cable penetrations, and sealing members. This segmentation allows for quick installation of the main fire barrier while enabling individual cable access without compromising the overall fire rating, and facilitates future modifications without complete removal.
Solution Approach 2:
The channel member is pre-formed with a U-shape that directly conforms to the cable tray geometry, and plugs are pre-configured with sealing members. This preliminary preparation eliminates the need for time-consuming on-site mixing, shaping, or customization of firestop materials, allowing rapid installation while maintaining fire barrier integrity.
2Reliability
If conventional firestop materials are installed in cable tray openings, then fire spread is prevented, but the system lacks adaptability for future modifications and cable changes
Solution Approach 1:
The firestop system transitions from a static, permanent installation to a dynamic, adjustable configuration. The removable plugs and sealing members can be taken out and reinstalled with different cables or conduits, allowing the fire barrier to adapt to changing infrastructure needs while maintaining its fire protection rating throughout the modification process.
Solution Approach 2:
The modular plugs and sealing members are designed to be temporarily removed, modified, or replaced as needed, then recovered and reinstalled. This allows individual cable penetrations to be updated without affecting the overall fire barrier, providing versatility for future modifications while preserving fire spread prevention.
3Reliability
If a robust fire barrier is created to seal cable tray openings, then fire spread is blocked, but the device complexity increases
Solution Approach 1:
The device combines multiple firestop functions into a single integrated U-shaped channel member that simultaneously provides the main fire barrier, cable routing channel, and mounting structure. The plugs and sealing members are combined into unified components that address both sealing and structural requirements, reducing the number of separate elements needed while maintaining effective fire protection.
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 apparatus effectively seals cable tray openings, preventing fire spread and maintaining barrier integrity, while being adjustable and easy to install, allowing for future modifications without compromising the firestop's effectiveness.
Implementation Method 1
Intumescent material is positioned along an inner surface of each wall panel
Implementation Method 2
A compressible foam is positioned within the intumescent material and substantially closes off the through passage
Data Source
AI summary
A firestopping apparatus including a housing defined by first and second housing members. Each housing member includes a width direction wall panel and a height direction wall panel. The width direction wall panel of the first housing member is configured to connect with the height direction wall panel of the second housing member and the width direction wall panel of the second housing member is configured to connect with the height direction wall panel of the first housing member to define an assembled housing with a through passage. Intumescent material is positioned along an inner surface of each wall panel. A compressible foam is positioned within the intumescent material and substantially closes off the through passage.