Split Fire Stop Assembly for Corrugated Concrete Pipe Passages
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Solution Overview
Problem
Installing fire-blocking materials in tubular passages through concrete structures with corrugated bottom plates is challenging due to the irregularities of the corrugated surface, which complicates the placement and effectiveness of standard fire-blocking assemblies, especially when the concrete has hardened.
Innovation Solution
A fire stop assembly comprising a support plate with rotating portions, a cylindrical cage, and a split intumescent ring that can be positioned around a tube and extended into the concrete passage, providing a seal that adapts to the corrugated bottom plate's ridges and channels, allowing for effective fire-blocking even in non-standard passage configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If holes are drilled through hardened concrete after pouring, then access to the passage is achieved, but the holes are cylindrical and standard fire-blocking assemblies cannot adapt to the corrugated bottom plate irregularities
Solution Approach 1:
The fire stop assembly incorporates a rotatable support plate with first and second portions that can rotate between open and closed positions. This dynamic mechanism allows the assembly to adapt to the irregular corrugated bottom plate surface by adjusting its orientation, while the cylindrical cage provides structural support and the fire-blocking material fills the passage effectively.
Solution Approach 2:
The fire stop assembly is divided into distinct segments: a support plate with rotatable portions, a cylindrical cage, and fire-blocking material. This segmentation allows each component to perform its specific function—the support plate provides adaptability through rotation, the cage provides structural integrity, and the fire-blocking material provides the fire-resistant seal.
2Reliability
If cast-in-place assemblies are embedded in concrete during pouring, then fire-blocking is integrated into the structure, but cutting holes in the corrugated metal form weakens the plate's load-bearing capacity
Solution Approach 1:
The fire stop assembly is designed to be installed after the concrete has hardened and the corrugated metal form has served its purpose. This preliminary action sequence allows the corrugated form to maintain its full load-bearing capacity during concrete pouring, while the fire-blocking is subsequently integrated into the hardened structure without compromising either the form's strength or the fire safety.
3Ease of operation
If plumbing fixtures block access to the top end of the passage, then the passage is functional for plumbing, but fire-blocking material cannot be installed in the passage
Solution Approach 1:
The fire stop assembly acts as an intermediary device that can be installed from the bottom end of the passage through the corrugated bottom plate. The rotatable support plate and cylindrical cage provide a mechanism to deliver and position fire-blocking material in the passage without requiring access from the top end, thus resolving the conflict between plumbing fixture installation and fire-blocking capability.
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 assembly effectively blocks smoke and fire by expanding the intumescent ring within the passage, ensuring a reliable seal despite the corrugated surface irregularities, thereby enhancing fire safety in concrete structures.
Implementation Method 1
a split intumescent ring having first and second intumescent ring portions each connected to and located radially inward of the respective first and second sidewall portions
Data Source
AI summary
A concrete structure with a corrugated bottom surface has a pipe passing through a passage in the structure. A fire stop assembly has a first portion with a split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring each fastened together to rotate together about a hinge on the split cage. The fire stop assembly has a second portion of the split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring fastened together to rotate together about a hinge. The first and second portions have free ends that spread apart to fit around the tube in an open position, and close around the tube in a closed position.