Railroad Tie Connecting Layer Fabric Embedding
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Solution Overview
Problem
Existing railway sleeper connecting layers, such as three-dimensional tangled fabrics, face limitations in force transmission due to heterogeneity and issues with cement slurry layers, which restrict the absorption of lateral forces, particularly in transverse directions.
Innovation Solution
A railway sleeper design featuring a connecting layer formed by a fabric with a three-dimensional structure, where threads or yarns with loop-like or curved courses are embedded in the concrete body and sleeper sole, providing deep embedding and forming undercut surfaces for enhanced shear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a three-dimensional tangled fabric is used as the connecting layer, then the embedding depth in concrete is increased, but the heterogeneity of the fabric increases leading to inconsistent force transmission
Solution Approach 1:
The patent changes the fundamental parameter of the connecting layer from a three-dimensional tangled fabric to a two-dimensional fabric with loop-like structures. This parameter change maintains adequate embedding depth while achieving uniform force transmission through the structured loop patterns that distribute loads consistently across the concrete interface.
Solution Approach 2:
The invention transitions from a three-dimensional tangled fabric structure to a two-dimensional fabric with vertical loop extensions. This dimensionality change allows the fabric to achieve effective embedding depth through the loop structures protruding from the fabric plane, while maintaining the planar arrangement that ensures uniform force distribution and reduced heterogeneity.
2Strength
If a three-dimensional tangled fabric is used as the connecting layer, then the tear-resistant connection is improved, but the heterogeneity with holes and fiber accumulations increases
Solution Approach 1:
The patent changes the structural parameter from three-dimensional tangled fibers to two-dimensional fabric with organized loop structures. This transformation maintains tear-resistant connection through the loop structures that anchor into concrete, while eliminating the heterogeneity of holes and fiber accumulations inherent in random three-dimensional fabrics.
Solution Approach 2:
The invention creates a composite structure combining a two-dimensional fabric base with vertically protruding loop-like structures. This composite approach provides both the mechanical anchoring needed for tear resistance and the geometric regularity that ensures structural uniformity, avoiding the inconsistencies of fully three-dimensional tangled fabrics.
3Strength
If a fabric with loop-like structures is used as the connecting layer, then the shear-resistant connection is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the fabric structure parameter by using loop-like structures with controlled dimensions (loop length 2-10mm, loop diameter 0.5-5mm). These specific parameter ranges provide adequate shear resistance through the loop anchoring mechanism while keeping the overall structure simple and manufacturable, avoiding excessive complexity.
Solution Approach 2:
The invention applies partial three-dimensionality through loop structures that extend vertically from the fabric plane, rather than creating a fully three-dimensional tangled structure. This partial approach provides the necessary shear resistance through loop embedding while maintaining the simplicity of a base fabric structure, avoiding the complexity of complete three-dimensional construction.
Data Source
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AI summary
A railroad tie has a concrete body (2) having a tie sole (3) which is attached thereto, wherein in order to connect the tie sole (3) to the concrete body (2) in a way which is resistant to shearing force a connecting layer (6) is provided which is connected both to the tie sole (3) and to the concrete body (2), and is at the same time partially embedded in the concrete of the concrete body (2). The connecting layer (6) is or comprises a fabric.