Lateral Sway Brace Clamp With Torque-Limiting Seismic Pipe Coupling
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Solution Overview
Problem
Existing seismic bracing systems for plumbing and sprinkler systems require complex installation processes and often rely solely on friction for coupling, which can lead to inefficiencies and limitations in accommodating multiple pipe sizes and resisting seismic loads effectively.
Innovation Solution
A lateral sway brace fitting composed of a U-bolt with conical tips, stamped attachment hooks, and torque-limiting nuts that allows for secure engagement of sway brace pipes to service pipes without requiring pipe repositioning, providing symmetrical loading and accommodating various pipe sizes through a V-shaped notch and profile, while limiting torque to prevent overtightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional sway bracing systems are used, then seismic bracing can be provided, but installation complexity increases and multiple pipe sizes cannot be accommodated effectively
Solution Approach 1:
The sway brace fitting is designed with a universal V-shaped notch configuration that can accommodate multiple pipe sizes (1 inch and 1.25 inch steel pipe) using the same fitting design. The notched configuration allows the fitting to adapt to different pipe diameters without requiring different fitting types, thereby reducing installation complexity while maintaining versatility across multiple pipe sizes.
Solution Approach 2:
The fitting is divided into distinct functional components: a U-bolt portion for securing to the service pipe, a notched portion for engaging the sway brace pipe, and a flat portion for nut engagement. This segmentation allows each component to perform its specific function independently, simplifying the overall installation process while maintaining adaptability to various pipe configurations.
2Strength
If friction-based coupling is used, then simple connection is achieved, but seismic load resistance is insufficient
Solution Approach 1:
The U-bolt is formed with a curved configuration that wraps around the service pipe, creating a mechanical embrace that distributes seismic loads around the pipe circumference. This curved geometry provides superior load resistance compared to linear connections, while the continuous curve allows for natural load path distribution during seismic events.
Solution Approach 2:
The fitting combines different material properties and connection mechanisms: the U-bolt provides mechanical wrapping, the notched portion enables positive engagement with the sway brace pipe, and the flat portion with threaded holes allows for bolted/nutted securement. This composite approach integrates multiple connection methods into a single fitting, achieving high seismic load resistance without proportionally increasing complexity.
3Reliability
If pipe repositioning is required during installation, then secure fitting can be achieved, but installation time and complexity increase
Solution Approach 1:
The fitting is pre-configured with the U-bolt, notched portion, and flat portion with threaded holes integrated into a single component. This preliminary configuration allows the fitting to be ready for immediate installation without requiring on-site assembly or pipe repositioning, thereby reducing installation time while maintaining secure fitting through the integrated multi-component design.
Solution Approach 2:
Instead of requiring pipes to be repositioned to accommodate the fitting, the fitting is designed to adapt to the pipes in their final positions. The notched configuration allows the sway brace pipe to be engaged at any longitudinal position without requiring feeding through the clamp, inverting the traditional approach where the fitting dictates pipe positioning.
4Strength
If torque is not limited during nut tightening, then secure connection is achieved, but overtightening and damage can occur
Solution Approach 1:
The fitting design incorporates features that provide feedback during the tightening process. The notched configuration and flat portion geometry create natural engagement points that indicate when proper contact is achieved, preventing excessive tightening. The integrated design allows the installer to feel and observe when the connection is sufficiently secured, providing tactile and visual feedback to avoid overtightening damage.
Data Source
AI summary
A sway brace fitting clamp is used for lateral bracing of sprinkler or other types of pipe (designated the service pipe) to a structure, to prevent movement of the service pipe perpendicular to the axis of the pipe relative to the structure to which it is attached. The sway brace fitting clamp includes a U-bolt which fits around the service pipe, and a pair of hooks that are coupled to straight ends of the U-bolt, for hooking the sway brace pipe. A pair of nuts engages threaded portions of the U-bolt ends. The nuts may be tightened to pull the sway brace pipe into contact with the service pipe, firmly clamping the sway brace pipe and the service pipe together.