Railway Sleeper Flock Fiber Shear Connection
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Solution Overview
Problem
Existing railway sleeper connecting layers, such as tangled fiber layers or fleece layers, face limitations in force transmission due to their three-dimensional shape and heterogeneity, leading to issues with cement slurry layers and differing expansion behaviors under environmental changes, which affect the shear force-resistant connection between the concrete body and the sleeper base.
Innovation Solution
The use of flock fibers, which are individually connected to the sleeper sole and partially embedded in the concrete body, primarily at right angles, to enhance the shear force-resistant connection by increasing the surface area of contact and improving force transmission through a homogeneous distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-dimensional tangled fiber layers or fleece layers are used as connecting layers, then the permanent connection between concrete body and sleeper sole is improved, but the heterogeneity of the structure leads to holes, lump-like fiber accumulations, and variations in thickness that reduce manufacturing precision
Solution Approach 1:
The patent changes the fundamental parameter of fiber arrangement from three-dimensional tangled structures to two-dimensional perpendicular orientation. Fibers are arranged substantially perpendicular to the sleeper sole surface, creating a homogeneous mat structure that eliminates the heterogeneity problems of tangled layers while maintaining connection reliability through consistent fiber distribution and orientation.
Solution Approach 2:
The invention achieves homogeneity by using a mat of fibers with uniform perpendicular orientation rather than random tangled arrangements. This homogeneous structure eliminates holes, lump-like accumulations, and thickness variations, providing consistent mechanical properties throughout the connecting layer while maintaining reliable connection between concrete body and sleeper sole.
2Force
If three-dimensional tangled fiber structures are used, then force transmission capability is improved, but the limited ability to embed in lower-lying areas of concrete body restricts effective force transmission
Solution Approach 1:
The patent transitions from three-dimensional tangled fiber structures to a two-dimensional mat structure with fibers oriented perpendicular to the sleeper sole surface. This dimensional change allows the connecting layer to conform better to the concrete body surface, including lower-lying areas, while maintaining effective force transmission through the perpendicular fiber orientation that directly engages with the concrete.
3Ease of operation
If different expansion behaviors occur between sleeper sole and connection layer under environmental changes, then handling difficulty increases, but the connection reliability may be impaired
Solution Approach 1:
The homogeneous mat structure with uniformly oriented fibers provides consistent expansion behavior across the entire connecting layer. This uniformity reduces differential expansion between the sleeper sole and connection layer under environmental changes, making handling easier while preserving connection reliability through consistent mechanical interlocking throughout the structure.
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
This solution significantly increases the resistance to tearing and shearing forces, reduces the risk of bond impairment due to environmental changes, and simplifies production by allowing for factory-based assembly, thereby improving the reliability and ease of manufacturing.
Implementation Method 1
fibers being connected on the one hand to the sleeper base and on the other hand to the concrete body and partially embedded in the concrete of the concrete body, for the purpose of shear force-resistant connection
Implementation Method 2
The fibers are connected to one another only indirectly, namely via the undersleeper sole or an adhesive layer applied thereto
Data Source
AI summary
The invention relates to a railway sleeper, comprising a concrete body (2) having a sleeper pad (3) attached thereto, wherein, in order to connect the sleeper pad (3) to the concrete body (5) in a manner resistant to shearing force, fibres (6) are bonded on the one hand to the sleeper pad (3) and on the other hand to the concrete body (2), and at the same time are partially embedded in the concrete of the concrete body (2). The sleeper pad (3) is flocked with the fibres (6).