Road Barrier Spacer With Weaker Area For Controlled Rail Rise
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Solution Overview
Problem
Existing road safety barriers struggle to effectively restrain both lightweight and heavy vehicles due to limited rail deformation and detachment issues during impacts, which compromise the barrier's ability to control vehicle movement.
Innovation Solution
A spacer design for road safety barriers that includes a rail support with a weaker area and a rail guide, allowing controlled rail rise and detachment to effectively restrain vehicles, featuring a connector housing, a flange, and a rail reinforcement area to manage forces and prevent excessive rail movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rail is made rigid to restrain heavy vehicles, then the restraining capability for heavy vehicles is improved, but lightweight vehicles may be crushed against the barrier
Solution Approach 1:
The spacer is designed to deform progressively under impact, transforming the rigid barrier into a dynamic system. The deformation mechanism allows the barrier to adapt its restraining force based on impact severity, providing gentle restraint for lightweight vehicles while maintaining sufficient strength for heavy vehicles through controlled structural changes during impact
Solution Approach 2:
The barrier's mechanical properties change during impact through progressive deformation of the spacer. The structure transitions from an initial rigid state to a deformed state with modified load-bearing characteristics, enabling the same barrier to provide appropriate restraint levels for different vehicle types by changing its physical parameters during the collision event
2Strength
If the spacer dimensions are increased to allow greater rail rise, then the restraining effectiveness for heavy vehicles is improved, but the device complexity and material usage increase
Solution Approach 1:
The spacer is segmented into distinct functional zones including a deformation zone with reduced thickness and stronger zones for structural support. This segmentation allows the deformation zone to provide the necessary rise and deformation capacity without requiring the entire spacer to be oversized, thereby achieving effective heavy vehicle restraint while controlling overall complexity and material usage
Solution Approach 2:
The spacer features local variations in thickness and structural properties, with a deformation zone of reduced thickness positioned to undergo controlled deformation. This local quality approach concentrates the deformation capability where needed while maintaining structural integrity elsewhere, achieving effective rail rise without proportionally increasing overall spacer dimensions
3Strength
If the bolts are positioned in the upper position of the notch to release the spacer during impact, then the rail detachment capability is improved, but the complete detachment makes it impossible to control subsequent rail movement
Solution Approach 1:
The connection system transitions from a static bolted connection to a dynamic system where the bolt's position relative to the notch changes during impact. The bolt initially engages the upper position for secure connection, then as the spacer deforms and the rail rises, the bolt naturally moves relative to the notch, allowing controlled detachment at the appropriate moment while maintaining reliability of movement control throughout the sequence
Solution Approach 2:
The notch geometry is designed in advance to guide the bolt's movement path and detachment timing. The preliminary configuration of the notch and bolt positioning ensures that during impact, the bolt will naturally follow a predetermined path that allows it to engage the upper position initially, then detach at the optimal moment when the rail has risen sufficiently, thereby maintaining control over subsequent rail movement
4Strength
If the spacer deforms progressively under impact to restrain heavy vehicles, then the restraining capability is improved, but the rail rise amplitude is limited by the modest dimensions of the spacer
Solution Approach 1:
The spacer is divided into a deformation zone with reduced thickness and stronger supporting zones. This segmentation enables the deformation zone to undergo significant localized deformation and contribute to rail rise without requiring the entire spacer to be of large dimensions, thereby achieving greater rail rise amplitude while maintaining overall compactness
Solution Approach 2:
The deformation mechanism utilizes the thickness dimension of the spacer by creating a deformation zone with reduced thickness. This allows the spacer to achieve significant deformation and rail rise in the vertical direction by exploiting the thickness dimension, effectively increasing rail rise amplitude without proportionally increasing the spacer's planar dimensions
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 spacer design enables controlled rail deformation and rise, effectively restraining both lightweight and heavy vehicles by managing forces and preventing excessive rail movement, enhancing safety barrier performance.
Implementation Method 1
a weaker area connecting the connector housing to the upper edge of the front face, the mechanical resistance of the weaker area being strictly lower than the intrinsic mechanical resistance of the constituent material of the remaining part of the front face of the rail support
Implementation Method 2
the spacer also comprising a rail guide comprising in succession: a fastening area suitable for the fastening of the rail guide to a post above the rail support, a connecting piece and a rail reinforcement area suitable for the fastening of the rail guide to the reverse side of the rail
Implementation Method 3
a safety barrier comprising a spacer that is capable of deforming progressively under the effect of an impact
Data Source
AI summary
A spacer for a road safety barrier is provided. The spacer includes a rail support having a front face to be fastened to a rail, a rear face to be fastened to a post and a flange that connects the front face to the rear face. The front face includes a connector housing and a weaker area connecting the connector housing to the upper edge of the front face, the mechanical resistance of the weaker area being strictly lower than the intrinsic mechanical resistance of the constituent material of the remaining part of the front face of the rail support. The spacer also includes a rail guide including a fastening area for fastening the rail guide to a post above the rail support, a connecting piece and a rail reinforcement area for fastening the rail guide to the reverse side of the rail.