Segmented Cable Barrier Post Design
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Solution Overview
Problem
Conventional cable barrier posts with a single slot are weak and prone to shearing or buckling, require solid construction or stronger materials, making them costly, and are difficult to replace due to the slot's location, which also leads to cable entrapment and reduced energy absorption upon impact.
Innovation Solution
A post design with apertures on alternate sides, each with a retaining portion and an opening for easy cable release, providing symmetrical loading and increased strength, and a hollow cap with an integrally formed appendage for quick cap insertion and improved impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single slot is used to retain multiple cables, then the cable retention function is achieved, but the lateral strength of the post is reduced making it prone to shearing or buckling
Solution Approach 1:
The single slot is divided into multiple separate apertures positioned at different locations around the post perimeter. This segmentation allows each aperture to provide localized cable retention while maintaining the overall structural integrity of the post, as the solid material between apertures continues to provide lateral strength.
Solution Approach 2:
The apertures are positioned at multiple locations around the post's perimeter rather than as a single vertical slot. This distributes the cable retention function across multiple points in space, allowing cables to be retained at different heights and positions while preserving the post's lateral strength through the solid material between aperture locations.
2Strength
If solid construction or stronger materials are used to compensate for the weakened region, then the lateral strength is sufficient, but the cost increases
Solution Approach 1:
Instead of using solid construction throughout, the post is designed with segmented apertures that provide cable retention only where needed. This allows the use of lighter, more cost-effective materials and construction methods while maintaining sufficient lateral strength in the solid regions between apertures.
Solution Approach 2:
The post structure has different properties at different locations: apertures are provided only at specific locations where cable retention is needed, while the regions between apertures maintain solid construction for lateral strength. This local differentiation allows cost-effective materials to be used overall while maintaining strength where required.
3Adaptability or versatility
If the slot is positioned to retain cables, then cable retention is achieved, but the post becomes difficult to replace requiring large post holes and cable loosening
Solution Approach 1:
The segmented aperture design allows individual apertures to be accessed and modified independently. When replacing a post, the segmented structure facilitates easier removal and installation compared to a continuous slot, reducing the need for large post holes and extensive cable loosening.
4Loss of energy
If the top of the post folds over following impact, then the impact energy is absorbed, but the cables become trapped in the aperture reducing energy absorption capability
Solution Approach 1:
Apertures are positioned at multiple locations around the post perimeter rather than as a single vertical slot. This spatial distribution ensures that if the post deforms during impact, cables in different apertures are less likely to all become trapped simultaneously, maintaining better energy absorption capability.
Data Source
AI summary
A post is provided which includes apertures on alternate sides of the post which, in use, receive and retain at least one cable therein, the same number of apertures are on each side of the post wherein each aperture: has a side opening in the form of a mouth, wherein the mouth is at a distal region thereof configured to have a top surface with an angle greater than the angle at a proximate region of the mouth so as to reduce the travel path of, and/or; any frictional contact with; the cable, during ejection from aperture following a collision.