Railway Track Bed Resin Injection for In-Place Sleeper Stabilization
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Solution Overview
Problem
Existing track bed rehabilitation methods require closure of railway lines due to the use of large machines like tamping units, are laborious, noisy, and costly, and do not always produce satisfactory results, leading to disruptions and increased maintenance costs.
Innovation Solution
A method involving the injection of a low-viscosity polyurethane-based thermoset resin into the track bed beneath sleepers using packers, allowing stabilization without disrupting train traffic, by forming a compact body that secures the sleepers and rails in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large machines like tamping units are used for track bed rehabilitation, then the track bed can be stabilized, but the railway line must be closed and maintenance costs increase
Solution Approach 1:
The patent replaces large mechanical tamping units with a chemical injection system. Instead of using mechanical vibration and compaction equipment that requires track closure, the invention injects expanding foam material through small boreholes drilled in the track bed, allowing stabilization to proceed while trains continue to operate on adjacent tracks
Solution Approach 2:
The invention changes the physical state and properties of the track bed by injecting a two-component foam material that expands and hardens in situ. This chemical transformation allows the track bed to be stabilized without mechanical intervention, eliminating the need for track closure and large equipment
2Reliability
If large machines like tamping units are used for track bed rehabilitation, then the track bed can be stabilized, but maintenance costs and labor requirements increase
Solution Approach 1:
The patent replaces expensive mechanical tamping units with a simple injection system consisting of a foam generator, hoses, and small drilling equipment. This substitution dramatically reduces equipment rental costs, labor requirements, and overall maintenance expenses while achieving the same stabilization effect
Solution Approach 2:
The invention uses consumable foam material that is injected and then remains permanently in the track bed. The foam cartridges or containers are disposable, but the overall system eliminates the need for expensive reusable heavy machinery, reducing overall maintenance costs
3Reliability
If traditional ballast cleaning and replacement is performed, then the track bed can be stabilized, but the process is laborious and time-consuming
Solution Approach 1:
The patent replaces the laborious mechanical process of ballast removal, cleaning, and replacement with a rapid chemical injection process. The foam material is pumped into the track bed through small holes and stabilizes the structure in minutes rather than requiring days of manual labor
Solution Approach 2:
The invention performs preliminary stabilization by injecting the foam material into the track bed before significant deterioration occurs. The foam prevents further ballast degradation and sleeper settlement, maintaining track bed reliability proactively rather than requiring extensive remedial work
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
Enables rapid and effective track bed stabilization under live train conditions, reducing maintenance downtime and costs, ensuring stable sleeper and rail positioning, and allowing higher speed operations.
Implementation Method 1
injection of a low-viscosity polyurethane-based thermoset resin into the track bed beneath sleepers using packers, allowing stabilization without disrupting train traffic, by forming a compact body that secures the sleepers and rails in place
Data Source
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AI summary
The present invention relates to a method for the rehabilitation and/or stabilization of a track bed, wherein railway rails are attached to sleepers and the sleepers are arranged in or on the track bed and stones, ballast or the like are located in the track bed, wherein the rehabilitation and/or stabilization takes place in the track bed itself without detaching the sleepers or rails and/or without removing the sleepers from the track bed, wherein the sleepers have a central section and two end sections, and the central section is located between the two end sections, wherein in the area of the central section and/or one or both end sections of the sleeper a material, preferably an injection resin, is injected laterally into the track bed at the sleeper using a packer, filling nozzle or the like.wherein the material solidifies or hardens after application and wherein, during injection, the material enters the track bed below the sleeper and wets the track bed material, namely stones, ballast or the like, and fills gaps and/or cavities in the track bed, and after solidification of the material, preferably injection resin, the area of the track bed that is wetted by the injection material, or whose gaps and/or cavities are filled, forms a compact body on which the sleeper rests.