Guardrail Rail Sliding on Post Slots for Impact Energy Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing roadway guardrail systems face challenges with wooden support posts that deteriorate due to environmental exposure, leading to increased costs and hazardous waste, while steel posts require significant resources for fabrication and installation, and breakaway designs have remained largely unchanged, necessitating improved energy dissipation and redirection capabilities.
Innovation Solution
A roadway guardrail system featuring steel support posts with slots and fasteners that allow the rail to slide along the post upon impact, dissipating energy and redirecting vehicles, with the option for the post to fracture under sufficient force, and a design that reduces material costs and installation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wooden support posts are used in guardrail systems, then installation is simpler, but they deteriorate due to environmental exposure leading to increased costs and hazardous waste
Solution Approach 1:
The patent replaces durable but expensive and complex steel posts with simpler, shorter-lived wooden posts that are treated with preservatives. The wooden posts are designed to be replaced periodically rather than lasting indefinitely, balancing initial installation simplicity with long-term durability concerns through a replacement strategy rather than permanent installation.
2Reliability
If steel support posts are used instead of wooden posts, then durability and reliability improve, but material costs and installation complexity increase
Solution Approach 1:
The patent adopts wooden posts treated with preservatives as a cost-effective alternative to expensive steel posts. While wooden posts have shorter service lives, their lower material cost and simpler installation process (without requiring heavy equipment or specialized foundation work) resolve the contradiction between durability and installation complexity.
3Loss of energy
If breakaway steel support posts with cutouts or apertures are designed, then energy dissipation improves, but fabrication time and resources increase substantially
Solution Approach 1:
The patent uses simple wooden posts without complex cutouts or apertures. The energy dissipation function is achieved through the natural deformation and failure of the wooden posts during impact, eliminating the need for expensive and time-consuming fabrication of complex steel post designs with precision-cut features.
4Strength
If larger steel posts are used to withstand impact forces, then vehicle redirection capability improves, but material costs and installation resources increase
Solution Approach 1:
The patent employs standard-sized wooden posts rather than large, heavy steel posts. The posts are designed to fail in a controlled manner during impact, dissipating energy through deformation and fracture. This approach achieves adequate impact resistance for typical vehicular collisions while maintaining simplicity in installation and avoiding the need for heavy equipment or complex foundation work.
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 effectively dissipates vehicle impact energy, redirects vehicles safely, and meets regulatory standards while reducing material costs and installation complexity, providing improved safety and durability compared to previous designs.
Implementation Method 1
the fasteners are adapted to slide along the slot in the support post
Implementation Method 2
dissipating energy and redirecting vehicles
Implementation Method 3
The guardrail systems may act to contain and redirect an errant vehicle along such roadways. Such guardrail systems may dissipate some of the vehicle's energy through deformation of the rail or post
Data Source
AI summary
A roadway guardrail system including a rail and plurality of support posts assembled such that upon impact from a vehicle the rail moves upwardly with respect to the post. Fasteners may be used in the operative coupling of the rail to the support posts, such that upon impact the fasteners move upwardly with respect to the support posts and the rail moves upwardly along with the fasteners. The guardrail system may further include a reinforcing member that is slidable along the post and operatively coupled to the rail with the fasteners, such that the rail and fasteners slide along with the reinforcing member with respect to the support posts. The reinforcing member may be a spacer of various shapes, a washer, an additional rail section, or other type of member that allows the rail to slide upwardly with respect to the post.