Twin-Block Sleeper Recessed Channels Force Distribution
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Solution Overview
Problem
Existing twin-block sleepers for ballastless slab tracks face challenges in manufacturing complexity and effectiveness in absorbing displacements and loads, particularly due to the need for complex fastening mechanisms and lack of flexibility without ballast, which increases manufacturing costs and complicates installation.
Innovation Solution
The design features two concrete blocks joined by a reinforcing steel frame with pyramidal truncated bodies, inclined upper surfaces, and transverse recesses to absorb forces, along with inclined bores for secure fastening, allowing for easier manufacturing and enhanced flexibility to accommodate different track widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If lateral protrusions or shoulders are added to block upper surfaces to support fastenings, then lateral force absorption is improved, but manufacturing complexity and fastening complexity increase
Solution Approach 1:
The invention removes the lateral protrusions or shoulders from the block upper surface, extracting the complex structural elements that caused manufacturing and fastening complexity while maintaining lateral force absorption capability through the recessed channel design
Solution Approach 2:
Instead of adding protrusions to support fastenings, the invention inverts the approach by creating recessed channels that guide and support the fastenings, thereby simplifying the block structure while maintaining or improving lateral force absorption
2Reliability
If fastenings are enlarged to be supported on protrusions or shoulders, then fastening support capability is improved, but fastening complexity and manufacturing cost increase
Solution Approach 1:
The invention removes the need for enlarged fastenings by extracting the support function from the fastening components and transferring it to the recessed channels in the block, thereby simplifying the fastening structure while maintaining support capability
Solution Approach 2:
The recessed channels act as an intermediary structure between the block and the fastenings, providing the necessary support and guidance without requiring complex fastening designs with enlarged components
3Strength
If ballast is used to distribute pressures and forces, then force distribution is improved, but track structure complexity increases
Solution Approach 1:
The invention removes the ballast layer from the track structure, extracting the force distribution function and transferring it to the recessed channels in the concrete blocks, thereby simplifying the overall track structure while maintaining force distribution capability
Data Source
AI summary
Twin-block sleeper for ballastless slab track, related to a railway sleeper of the type to be used in particular for ballastless track or (concrete) slab track and comprising two concrete blocks joined by a reinforcing steel frame, said blocks being provided with holes intended to house an fastening to secure a rail, preferably four holes which allow the sleeper to be used for two different track gauges, thus being multipurpose, and in any case with the particularity that said sleeper blocks have an improved structural configuration which provides significant advantages, both in their manufacturing and in their effectiveness for absorbing displacements and loads of the fastenings which support the rails, with respect to the systems currently known for such purpose