Settable-Ballast Roadway Barrier With Lightweight Outer Shell
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Solution Overview
Problem
Existing roadway barriers made from concrete, steel, and water-filled plastics are heavy, difficult to transport, prone to cracking upon impact, and lack resilience, posing significant handling and installation challenges.
Innovation Solution
A lightweight barrier design featuring an outer shell with a cavity that contains a pourable settable ballast material, which sets to form a solid block, providing structural rigidity through an upper structural element and minimizing shell weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If barriers are made from concrete, steel, or water-filled plastics to achieve effective barrier function, then barrier strength and impact resistance are improved, but weight increases significantly making transportation difficult
Solution Approach 1:
The barrier is divided into two main segments: a lightweight outer shell and an inner ballast material. The outer shell provides structural integrity and impact resistance, while the ballast material (concrete, steel, or water-filled plastic) provides the necessary weight for barrier function. This segmentation allows the barrier to achieve both strength and manageable weight by separating structural functions from ballast functions.
Solution Approach 2:
The ballast material is nested within the outer shell of the barrier. The inner ballast is contained within the protective outer shell structure, creating a nested configuration where the heavier material is enclosed within a lighter protective casing. This nesting approach allows the barrier to maintain its full weight for effectiveness while enabling easier handling through the outer shell during transportation.
2Weight of moving object
If water-filled plastic barriers are used to reduce initial weight, then transportation ease is improved, but handling complexity increases due to filling and emptying requirements
Solution Approach 1:
The ballast material is pre-loaded into the outer shell during the manufacturing process before the barrier is shipped to the installation site. This preliminary action of filling the ballast eliminates the need for on-site filling operations, reducing installation time and handling complexity while maintaining the barrier's full weight for immediate effectiveness.
3Reliability
If concrete and steel barriers are designed to rely on weight for barrier function, then barrier effectiveness is improved, but resilience on impact is reduced causing cracking and loss of functionality
Solution Approach 1:
The barrier design changes the structural parameters by introducing a flexible outer shell with energy-absorbing features such as deformable sections, bending zones, or collapsible elements. These parameter changes allow the barrier to deform controllably during impact, absorbing kinetic energy and reducing the transmission of shock forces to the ballast material, thereby preventing cracking while maintaining barrier effectiveness.
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 barrier achieves effective vehicle impact resistance and immediate functionality, with reduced weight and ease of transportation, while meeting stringent crash test standards, including MASH Test Levels 3 and 4.
Implementation Method 1
a settable ballast material can be poured into the cavity and contained by the structure, with the ballast material ultimately setting to form a solid block of ballast material
Data Source
AI summary
An elongate barrier (3) comprises an outer shell in an elongate lower section of the barrier that defines a cavity (11) that receives and contains a pourable settable ballast material when the barrier is being manufactured. The barrier also comprises a solid block (15) of a ballast material in the cavity formed from the pourable settable ballast material.