Crash Barrier Beam Asymmetric Profile Impact Redirection
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Solution Overview
Problem
Temporary road crash barriers face challenges in balancing strength and stability with ease of assembly and cost-effectiveness, particularly in situations where they need to be deployed without securing to the road, and they often deflect under impact from vehicles like pick-up trucks due to design flaws in existing barriers.
Innovation Solution
A crash barrier beam design featuring a laterally extending base, a narrower central wall with a steep angle, and a top section with a box-like cross-section, including an inwardly directed shoulder and a shallow lip to redirect vehicle wheels, formed from a single sheet of material or mirror-image sheets for stability and impact absorption, with rubber feet for improved traction and drainage channels for temperature expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a temporary crash barrier uses vertical posts to absorb impact energy, then the barrier can be simpler and easier to assemble, but the barrier deflects under impact from vehicles like pick-up trucks
Solution Approach 1:
The patent changes the geometric parameters of the beam profile, specifically creating a asymmetric cross-section with a deep lateral groove that directs impact forces. The groove depth and positioning are optimized to redirect chassis rails away from the posts, transforming the force distribution parameters to prevent deflection while maintaining assembly simplicity
Solution Approach 2:
The beam cross-section is designed with asymmetric features including a deep lateral groove on the traffic side and an offset neutral axis. This asymmetry causes impacting vehicles to engage the groove first, which redirects the force away from the vertical posts, preventing the deflection problem while keeping the structure simple and easy to assemble
2Strength
If a temporary crash barrier is designed with higher strength and stability, then the barrier can withstand impact better, but the manufacturing cost and assembly difficulty increase
Solution Approach 1:
The beam is designed as a modular component with standardized dimensions and features that can be manufactured independently and assembled quickly. The asymmetric profile with the lateral groove is a single integrated feature that provides both structural strength and impact redirection functionality, eliminating the need for additional strengthening components and reducing manufacturing complexity
Solution Approach 2:
The lateral groove serves multiple functions simultaneously: it redirects chassis rails away from posts, provides structural reinforcement, and guides proper installation orientation. This multi-functionality achieves high impact resistance without adding separate components, thereby controlling manufacturing costs and assembly difficulty
3Reliability
If a temporary crash barrier is deployed closer to traffic for better protection, then the barrier effectiveness increases, but the barrier becomes more vulnerable to deflection and lifting
Solution Approach 1:
The patent optimizes the geometric parameters of the beam profile, including the depth and positioning of the lateral groove, to create a stable configuration that resists deflection and lifting. The groove depth is specifically designed to engage chassis rails at optimal points, distributing impact forces to prevent barrier movement while allowing deployment close to traffic
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 design enhances stability and redirects vehicle wheels back onto the road, reducing deflection and the risk of lifting, allows for closer deployment to traffic, and simplifies assembly and manufacturing while maintaining cost-effectiveness.
Implementation Method 1
in the event of a vehicle impact, the gradient of the wall, the inwardly directed shoulder and the directed lip assist in redirecting an impacting vehicle wheel back towards the road away from the barrier
Implementation Method 2
the profile of the crash barrier beam - i.e. a narrow central element and a wider base - provides stability to the beam, since the beam has a low centre of gravity and a vehicle wheel riding up onto the base will assist in stabilising the beam against deflection thereof
Implementation Method 3
with rubber feet for improved traction
Implementation Method 4
and drainage channels for temperature expansion
Data Source
Figure 0
Figure 1a~1b
Figure 2
AI summary
A crash barrier beam (10) suitable for temporary placement on a road comprises a housing (18) which, in profile, has a laterally extending base (12) for contact with the road. The beam has a narrower central element (14) upwardly extending from the base that terminates in a top portion (16). The exterior of the housing provides a continuous impact surface to an oncoming vehicle and the profile provides stability to the beam on impact. The crash barrier beam (10) has a length defined by a first end (24) and a second end (26, 28). At least one of the first and second ends comprises formations (32, 34) for engagement with corresponding formations (38, 40) on an end of an adjacent beam (10') so as to facilitate joining of the beams to one another. The formations are configured for the beams to be substantially self-aligning with respect to each other.