Reinforced Concrete Tunnel Segment Load Transfer
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Solution Overview
Problem
Current tunnel lining segments made of reinforced concrete face challenges in load transfer capacity, durability, and fire resistance due to the use of expensive steel reinforcing materials that corrode and lose load-bearing capacity under compressive forces and in fire conditions.
Innovation Solution
Incorporating steel bars with specific orientations and placements within the reinforced concrete segments to enhance load transfer efficiency and durability, allowing for cost-effective production while maintaining high load-bearing capacity and improved fire resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel reinforcing materials are used to enhance load transfer capacity, then the load-bearing capacity is improved, but the cost increases and corrosion resistance deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the concrete structure by providing relief (reducing) the load transfer area in the longitudinal joint. This parameter change allows the concrete to develop higher compressive strengths locally, enabling the use of concrete instead of steel reinforcement while maintaining or improving load transfer capacity. The relief geometry creates a mechanical interlock that enhances the concrete-concrete connection.
Solution Approach 2:
The patent creates a composite structure by combining concrete with a specific relief geometry in the load transfer area. This composite design integrates the structural function and load transfer mechanism into the concrete itself, eliminating the need for separate steel reinforcement materials while achieving superior corrosion resistance and structural performance.
2Strength
If steel reinforcing materials are used to enhance load transfer capacity, then the load-bearing capacity is improved, but the fire resistance deteriorates
Solution Approach 1:
The patent extracts the steel reinforcement material from the structure and replaces it with a geometric solution implemented directly in the concrete. By taking out the steel and substituting it with a concrete relief geometry, the structure eliminates the material that is vulnerable to fire, thereby improving fire resistance while maintaining load transfer capacity through the geometric interlock mechanism.
Solution Approach 2:
The patent changes the geometric parameters of the concrete structure by providing relief the load transfer area, transforming the load transfer mechanism from material-dependent (steel reinforcement) to geometry-dependent (concrete relief shape). This parameter change enables the structure to maintain load-bearing capacity under fire conditions without relying on steel materials that degrade at high temperatures.
3Ease of operation
If the load transfer area is reduced to enable easier installation, then the ease of operation is improved, but the load transfer capacity deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the load transfer area by providing relief the concrete structure. This parameter change creates a geometry that simultaneously facilitates easier installation (by reducing the effective load transfer area to a manageable size) and enhances load transfer capacity (by creating mechanical interlock through the relief geometry). The relief shape allows for simpler handling and positioning during installation while ensuring adequate load transfer.
Data Source
AI summary
The invention relates to a tunnel lining segment of reinforced concrete, wherein the tunnel lining segment has a load transfer area for a longitudinal joint, with at least one steel bar with an end face being installed in the tunnel lining segment, the steel bar being arranged in the tunnel lining segment in such a way that a tangent to a centroidal axis of the steel bar encloses an angle of between 0° and 45° in the end face with a normal to the load transfer area, and wherein the end face is arranged at a distance (a) from the load transfer area which is between 0 mm and 50 mm, preferably between 0 mm and 10 mm.