Wire Rope Barrier Cable Holder Design
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Solution Overview
Problem
Traditional road safety barriers, such as concrete walls, are time-consuming to set up and maintain, leading to inconvenient lane closures and increased labor costs, while wire rope safety barriers face challenges in efficiently dissipating impact energy and maintaining structural integrity under various crash conditions.
Innovation Solution
A wire rope safety barrier system comprising line posts with cable holders that securely attach external and internal cables, featuring a cable holder design with a constricted exit passage and deformation mechanism to manage impact forces, and a terminal end configuration with a trigger and deflection post to absorb energy and reduce tension upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional concrete wall barriers are used, then structural integrity and safety are improved, but installation time and maintenance time increase significantly
Solution Approach 1:
The barrier system is divided into modular components (posts, cables, cable holders) that can be independently manufactured and assembled. The cable holders are separate detachable components that attach to posts, allowing for rapid assembly and replacement without moving entire barrier sections.
Solution Approach 2:
The patent uses flexible wire ropes and cables instead of rigid concrete structures. These flexible elements can be quickly installed and removed, providing both structural integrity and ease of installation. The cables maintain barrier functionality while allowing for rapid deployment and maintenance.
2Productivity
If wire rope barriers with simple cable attachment are used, then installation speed is improved, but impact energy dissipation capability deteriorates
Solution Approach 1:
The cable holder design allows the system to transition from a static rigid connection to a dynamic energy-absorbing mechanism. During impact, the cable deforms and the holder mechanisms engage different retention features, allowing controlled movement that dissipates energy while maintaining barrier integrity.
Solution Approach 2:
The cable holder changes its mechanical parameters during impact events. The retention features engage at different force levels, and the cable deformation characteristics change as the barrier absorbs energy. This parameter changing behavior enables both easy installation and effective impact energy dissipation.
3Ease of operation
If cable holders without retention features are used, then ease of installation is improved, but cable detachment under impact forces increases
Solution Approach 1:
The cable holder is pre-configured with multiple retention features (first and second retention features at different heights) that are ready to engage with corresponding features on the post. This preliminary arrangement ensures that during installation, the cable is securely retained, and during impact, the appropriate retention feature engages based on the force applied.
Solution Approach 2:
The retention mechanism is segmented into multiple discrete features rather than a single complex connection. The first retention feature handles normal operational loads, while the second retention feature engages during high-force impact events. This segmentation allows simple installation while ensuring reliable cable retention under various conditions.
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 system provides a quick and efficient installation process, effectively dissipates impact energy, and enhances structural integrity by securely attaching cables and managing forces during crashes, reducing the severity of accidents and maintenance needs.
Implementation Method 1
The cable holder is configured to deform upon impact to absorb some of the impact force
Data Source
AI summary
A wire rope safety barrier comprising a plurality of line posts positioned along a roadway. A plurality of cables are attached to the line posts and extend between the line posts to define a safety barrier along the roadway. At least one of the plurality of cables is an external cable engaging an outer surface of the line posts. Each external cable is connected to the line posts by a cable holder inserted through the cable holder slot, and the cable holder has a body portion and a hook portion. Each cable holder has a locating notch at a bottom surface configured to engage with the lower edge of a corresponding cable holder slot.