Elastomeric Sleeper Base with Segmented Bonding Layer
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Solution Overview
Problem
Existing sleeper soles for concrete railway sleepers lack a strong and durable connection between the elastomer layer and the connecting layer, which affects the stability and adhesion of the sleeper sole to the concrete sleeper.
Innovation Solution
The solution involves a connecting layer with a first layer of threads covering at least 50% of its surface area and a second layer with a smaller thread coverage, allowing for a strong adhesive bond and penetration of concrete, enhancing the connection between the sleeper sole and the railway sleeper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the first layer of the connecting layer is glued to the elastomer layer with high thread coverage, then the adhesive bond strength is improved, but the concrete penetration ability deteriorates
Solution Approach 1:
The connecting layer is divided into two distinct layers with different thread coverage characteristics. The first layer has high thread coverage (50-80%) for adhesive bonding to the elastomer layer, while the second layer has low thread coverage (20-40%) for concrete penetration. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
Different regions of the connecting layer are given different local qualities - the first layer has high thread density for adhesion, while the second layer has low thread density for penetration. This local differentiation resolves the contradiction by assigning specific functional properties to specific parts of the structure.
2Reliability
If the thread coverage in the connecting layer is increased, then the adhesive bond to elastomer is improved, but the connection to concrete deteriorates
Solution Approach 1:
The connecting layer is segmented into two functional layers: the first layer with high thread coverage for reliable adhesive bonding to the elastomer layer, and the second layer with low thread coverage for strong mechanical interlocking with concrete. This segmentation allows both connection requirements to be satisfied simultaneously.
Solution Approach 2:
The connecting layer functions as a composite structure combining two different thread coverage configurations in one integrated component. This composite design enables the structure to exhibit both adhesive bonding characteristics and mechanical interlocking characteristics, achieving overall connection reliability and strength.
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 configuration ensures a robust and resistant adhesive bond and allows concrete to penetrate effectively, resulting in a stable and permanent connection between the sleeper sole and the railway sleeper, improving the distribution of horizontal forces.
Implementation Method 1
the first layer of the connecting layer is glued to a surface of the elastomer layer
Implementation Method 2
the second layer has openings bordered by the second threads of the second layer... allowing the concrete of the railway sleeper to penetrate well into the bonding layer
Data Source
Figure 1~2
Figure 3~5
Figure 6~12
AI summary
Sleeper base (1) for arrangement on a bottom surface (2) of a concrete railway sleeper (3), wherein the sleeper base (1) comprises at least one elastomeric layer (4) and at least one bonding layer (5), wherein the bonding layer (5) comprises a first layer (7) formed from first threads (6) and a second layer (9) formed from second threads (8), wherein the first layer (7) and the second layer (9) are spaced apart from each other and are connected to each other by means of bonding threads (10), and the first layer (7) of the bonding layer (5) is bonded to a surface (11) of the elastomeric layer (4), and the first layer (7) has openings (12) enclosed by the first threads (6) of the first layer (7), and the second layer (9) has openings (13) enclosed by the second threads (8) of the second layer (9).where the area fraction of the first threads (6) in the first layer (7) is larger than the area fraction of the second threads (8) in the second layer (9).