Concrete Barrier Coupling Design for Impact Load Distribution
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Solution Overview
Problem
Concrete barriers in road construction face challenges with high loads and moments at the transition point between stationary and mobile guide wall elements during vehicle impacts, leading to potential damage and increased manufacturing complexity due to the use of sleeve shoes for force absorption.
Innovation Solution
A concrete barrier design featuring a stationary first guide wall element and a mobile second guide wall element connected via couplings with a first length greater than a second length, where rib-shaped webs on the rear side of the couplings protrude into the concrete body, distributing impact forces and using pressure plates to reduce local stress, and incorporating anchoring elements for added stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sheathing shoes are used to absorb forces at the transition point between stationary and mobile barrier elements, then the barrier can withstand high impact loads, but the manufacturing complexity and production effort increase
Solution Approach 1:
The invention extracts the force-absorbing function from separate sheathing shoes and integrates it directly into the barrier wall elements themselves. The recesses and coupling elements are built into the concrete elements during casting, eliminating the need for additional attachment components while maintaining the ability to withstand impact loads through controlled deformation zones
Solution Approach 2:
The invention merges multiple functions into the concrete barrier elements: the structural body, the force-absorbing mechanism (through recesses and coupling geometry), and the connection system are all integrated into single monolithic elements. This consolidation eliminates separate sheathing shoes and reduces manufacturing steps while preserving impact resistance
2Loss of energy
If the first barrier wall element is made stationary and the second is mobile, then the barrier can dissipate impact energy through controlled movement, but high forces and moments occur at the connection point
Solution Approach 1:
The invention segments the connection system into multiple coupling elements distributed along the end surfaces of the barrier elements. Instead of a single concentrated connection point, multiple coupling points share the impact forces and moments, reducing the peak load at any individual connection while maintaining overall structural integrity and energy dissipation capability
Solution Approach 2:
The invention creates different local properties within the barrier elements: the recesses provide localized deformation zones for energy absorption, while the coupling elements provide localized force transfer paths. The asymmetric coupling design (first coupling longer than second coupling) creates different stiffness characteristics at different locations to optimize force distribution during impact
3Adaptability or versatility
If multiple couplings with different lengths are used to connect barrier elements, then the connection can accommodate movement and distribute forces, but the manufacturing precision requirements increase
Solution Approach 1:
The invention uses asymmetric coupling lengths (first coupling longer than second coupling) to create inherent alignment guidance and tolerance compensation. The longer coupling acts as a guide that facilitates proper positioning during assembly, while the shorter coupling provides the necessary movement accommodation. This asymmetric design reduces the precision requirements compared to symmetric multi-coupling systems
Data Source
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AI summary
In a connection (2) of two guide wall elements (1f, 1m) of a concrete guide wall with a stationary, preferably cast-in-place concrete, first guide wall element (1f) having a base surface (5), an end surface (4) and side surfaces (7, 11), and with a mobile second guide wall element (1m) preferably aligned longitudinally therewith, having a base surface (5), an end surface (4) facing the end surface (4) of the first guide wall element (1f), and side surfaces (7, 11), the first guide wall element (1f) and the second guide wall element (1m) are connected to each other at their end surfaces (4) via a first positive-locking coupling (16). The first guide wall element (1f) and the second guide wall element (1m) are connected to each other via at least one second positive-locking coupling (18) horizontally spaced from the first positive-locking coupling (16).