Rail-Mounted Grout Injection for Railroad Subgrade Stabilization
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Solution Overview
Problem
Current methods for railroad track maintenance and repair are time-consuming, costly, and fail to effectively stabilize subgrade and subsoil, leading to long-term destabilization and increased maintenance needs.
Innovation Solution
A system and method involving a rail-mounted drilling rig that injects a cement grout mixture into the subgrade and subsoil to create cylindrical inclusions and fill ballast pockets, stabilizing the subgrade and subsoil, using a self-sufficient equipment setup that minimizes downtime and manpower.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lateral access to the rail bed is created by undercutting and removing ballast layers, then maintenance equipment can access the subgrade, but the process becomes time-consuming and requires significant removal of rail bed layers
Solution Approach 1:
The rail-mounted maintenance system enables equipment to service the rail bed directly from the track itself, eliminating the need for lateral access and repeated loading/unloading operations. The system serves itself by moving along the track on rails while performing maintenance functions.
Solution Approach 2:
The maintenance system is divided into modular components including drill units, grout injection systems, and ballast cleaning mechanisms that can be independently positioned and operated along the rail bed, enabling targeted subgrade treatment without removing overlying layers.
2Ease of manufacture
If lateral access is created to emplace stabilization material, then subgrade repair is possible, but the solution is temporary and does not prevent long-term subgrade failure
Solution Approach 1:
The system uses hydraulic drill rigs mounted on rails to penetrate the subgrade and inject grout mixtures deep into the subsoil layers. This hydraulic penetration method achieves reliable long-term stabilization without requiring lateral access or temporary repairs.
Solution Approach 2:
The maintenance system changes the physical and chemical parameters of the subgrade by injecting cement-based grout mixtures that alter the soil structure, bearing capacity, and stability of the subgrade and subsoil layers, providing permanent rather than temporary repair.
3Productivity
If equipment is offloaded from trailers to perform maintenance, then work can be done on the rail bed, but the process is time-consuming and increases manpower requirements
Solution Approach 1:
The rail-mounted maintenance system combines multiple functions including drilling, grout injection, ballast cleaning, and material handling into a single integrated platform that moves along the track, eliminating the need for separate equipment deployment and reducing overall system complexity.
Solution Approach 2:
The integrated rail-mounted system performs all maintenance operations from a single mobile platform, making the equipment self-sufficient and eliminating the need for external support equipment, manual material handling, and repeated setup/teardown operations.
4Loss of time
If subgrade stabilization is performed without lateral access, then track downtime is minimized, but the equipment must be rail-mounted and quickly deployable
Solution Approach 1:
The maintenance system is designed as a dynamic rail-mounted platform that can quickly position and deploy drilling and injection equipment at various locations along the track, adapting to different maintenance needs while minimizing track occupancy time through efficient movement and operation.
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
The system provides long-term stabilization of subgrade and subsoil, reducing maintenance costs and minimizing track downtime, while avoiding the need for additional ballast cleaning and generating waste, and is suitable for environmentally sensitive areas.
Implementation Method 1
withdrawing the drills and injecting a grout mix by the drill heads as the drills are withdrawn to form corresponding inclusions in the drilled holes
Implementation Method 2
injecting a cement grout mixture into the subgrade and subsoil to create cylindrical inclusions
Data Source
AI summary
The invention is a system and method for repairing, improving, and stabilizing subgrade and subsoil/natural ground layers of a rail bed generally consisting of softer soils. One embodiment includes a method of installing subsurface inclusions and ballast fills comprising injected slurry mixtures of stabilizing material such as cement grout mixed with in situ soil. Another embodiment includes a system of installed ground inclusions and ballast fills. Another embodiment includes an integrated system of equipment for emplacing the system of inclusions and ballast fills.