Self-aligning Corner Bead for Structural Steel Fireproofing
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Solution Overview
Problem
Existing corner beads for fireproofing structural steel face challenges in accurately gauging and applying fireproofing material thickness, particularly on three surfaces, due to difficulty in alignment and lack of a dam for wet cement, leading to uneven applications and requiring skilled installation.
Innovation Solution
A self-aligning double wire corner bead made from a single strip of welded wire fabric, bent to form wings and a double wire membrane, allowing for automatic alignment and uniform thickness distribution along three surfaces, with the width and angle of the wings determining the material thickness and providing a dam for the cement until it hardens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional v-shaped corner bead with adjustable legs is used, then the corner bead can be attached to metal lath or wire mesh, but the alignment with adjacent surfaces is difficult and requires great skill to install
Solution Approach 1:
The corner bead is designed with a self-aligning mechanism where the device automatically positions itself relative to the adjacent surfaces during installation, eliminating the need for skilled manual alignment. The geometry of the corner bead includes reference surfaces that naturally align with the lath and adjacent walls, allowing installers to achieve proper positioning without specialized skills.
Solution Approach 2:
The corner bead incorporates visual indicators or reference markings that change or become visible during installation, helping installers verify proper alignment and positioning. These visual cues enable quick verification of correct installation without requiring expert judgment.
2Manufacturing precision
If a traditional corner bead is used, then the fireproofing material can be applied, but the gauging of thickness along three surfaces is inaccurate and the application is uneven
Solution Approach 1:
The corner bead extends into a third dimension by incorporating a dam structure that protrudes from the main body. This dam creates a physical barrier that confines the fireproofing material and establishes a precise thickness limit on all three surfaces simultaneously, transforming a two-dimensional alignment problem into a three-dimensional controlled application process.
Solution Approach 2:
The corner bead geometry is designed with specific dimensional parameters including the dam height, wing angles, and reference surface positions that directly control the fireproofing material thickness. By precisely controlling these geometric parameters during manufacturing, uniform thickness is achieved without requiring complex adjustment mechanisms during installation.
3Manufacturing precision
If a traditional corner bead without a dam is used, then the installation process is simpler, but there is no dam for the wet cement material leading to uneven applications
Solution Approach 1:
The dam structure is pre-formed as an integral part of the corner bead during manufacturing. This preliminary action of creating the dam beforehand ensures that the fireproofing material will be properly contained and distributed during application, eliminating the need for separate dam installation steps and simplifying the overall construction process.
Data Source
AI summary
A self-aligning corner bead for fireproofing structural steel, having a strip of welded wire fabric cut to the appropriate width for the fireproofing thickness and bent longitudinally to form an obtuse V-shaped device is disclosed. A plastic nosing is installed along one edge. A method of finishing the corners for fireproofing of structural steel member using an improved corner bead includes the step of attaching the first wing of an obtuse V-shaped device through a lathe to the structural steel member utilizing pneumatic or screw type fasteners. The mesh structure of the second wing of the V-shaped device provides a dam to form a roughened surface on the first application of fireproofing material until it hardens.