Sectional I-Beam Post With Slip Couplings For Breakaway Safety
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Solution Overview
Problem
Existing roadside posts with breakaway couplings require replacement of both post sections and coupling members upon damage, leading to inefficiencies and increased maintenance costs, as components are often permanently attached by welding.
Innovation Solution
A sectional I-beam post design featuring multiple slip type couplings with detachable components, allowing for angular and lengthwise slip movement, where each coupling includes L-shaped brackets and plates with notches for secure yet breakable connections, enabling separate attachment and replacement of coupling elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coupling components are permanently attached to post sections by welding, then connection strength is improved, but maintenance complexity and cost increase because entire post sections must be replaced upon damage
Solution Approach 1:
The coupling system is divided into separate modular components: post sections, coupling members, and attachment hardware. This segmentation allows individual components to be replaced independently rather than requiring replacement of entire post sections, resolving the contradiction between maintaining strong connections and enabling easy repair.
Solution Approach 2:
The coupling members incorporate movable elements such as slides that can transition between engaged and disengaged positions. This dynamic design maintains strong mechanical connections during normal operation while enabling straightforward assembly and disassembly for maintenance, addressing both connection strength and ease of repair requirements.
2Reliability
If coupling components are permanently attached by welding, then structural integrity is improved, but repair time and cost increase due to inability to replace individual components
Solution Approach 1:
The coupling system separates the post sections from coupling members, allowing damaged coupling members to be replaced without replacing entire post sections. This segmentation maintains structural integrity through proper mechanical connections while dramatically reducing repair time by enabling component-level replacement.
Solution Approach 2:
The coupling members are pre-assembled with attachment hardware and designed for quick connection to post sections. This preliminary preparation allows rapid installation of replacement components, reducing repair time while maintaining reliable structural connections through the engineered coupling mechanism.
3Adaptability or versatility
If multiple couplings are provided with different slip directions, then adaptability to impact forces is improved, but device complexity increases
Solution Approach 1:
Different coupling members are designed with asymmetric characteristics, including L-shaped brackets with vertical slip capability and horizontal couplings with lateral slip capability. This asymmetric design provides adaptability to multi-directional impact forces while maintaining relatively simple individual component geometries that are easy to manufacture and install.
Data Source
AI summary
A sectional I-beam post for use along a roadside in which the post has a first elongate lower section securable via a first slip type coupling to a base anchored in the ground. Slip movement of such coupling is in a direction across the length of the post. The first coupling includes L-shaped brackets with one leg thereof attached to the post by bolts so as to be detachable therefrom and notches in the outer end of the other leg which projects outwardly from the post A second elongate upper post section has the lower end thereof connected to the upper end of the first post section by a second slip type coupling. Slip movement of the second coupling is in a direction lengthwise of the post. The second coupling includes an end plate bolted to at least one post section including at least one notch that providing a slip connection with the other post section. A third coupling includes end plates bolted to opposing post sections having a slip plate thereinbetween, each one of the end plates having notches that provide a slip connection between the opposing post sections.