Subgrade Stabilization Machine with Segmented Crawler Chassis
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Solution Overview
Problem
Existing methods for subgrade rehabilitation in track construction often result in uneven compaction due to the need to drive over the rehabilitation layer with a running gear, compromising the quality and efficiency of the process.
Innovation Solution
A method and machine design that allows for the formation of a rehabilitation layer without initial compaction, using a machine with a front and rear crawler chassis, a clearing chain, screening system, and leveling and compacting devices to mix and compact aggregates directly on the subgrade, enabling optimal layer formation with reduced effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a running gear drives over the rehabilitation layer before completion, then the machine can be supported during operation, but the compaction becomes uneven and quality deteriorates
Solution Approach 1:
The machine separates the support function (crawler chassis) from the compaction function (leveling and compacting device). The crawler chassis provides support during operation without driving over the rehabilitation layer, while the leveling and compacting device applies controlled compaction independently at the rear end.
Solution Approach 2:
The patent introduces an intermediary approach where the machine frame and its components are positioned and operated in a way that avoids direct driving over the rehabilitation layer. The support function is mediated through the crawler chassis positioned on either side of the working section, rather than driving directly on the layer being formed.
2Adaptability or versatility
If the machine structure is simplified for easy conversion, then adaptability improves, but compaction capability may be reduced
Solution Approach 1:
The machine is designed with universal components that can serve multiple functions. The crawler chassis can be positioned at different heights to provide support during operation or removed entirely when not needed. The leveling and compacting device can operate independently or in combination with other functions, allowing the machine to be adapted for different rehabilitation scenarios without requiring complete structural redesign.
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 approach ensures high-quality rehabilitation with minimal structural effort and allows for easy conversion of existing machines for additional uses, improving subsoil rehabilitation by preventing uneven compaction and enhancing process efficiency.
Implementation Method 1
the subgrade 19 is loosened by the ripping teeth 18
Implementation Method 2
The ballast cleaned in the screening plant 10
Implementation Method 3
The gravel picked up by a clearing device is cleaned in a screening plant and thrown off
Implementation Method 4
the subgrade 19 is leveled by means of the leveling and compacting device 15 and compacted to form a protective layer 21
Data Source
Figure 1~2
AI summary
The invention relates to a method for stabilizing a subgrade (19) that has been exposed after a track and ballast have been removed, wherein, in a first work pass, in a work segment (20) adjoining a rear tracked chassis with respect to a working direction (4), in parallel with the removal of the ballast (9), a loosening of the subgrade (19), an introduction of additives (30), and a leveling occur. In a second work pass, the subgrade (19) mixed with additives is throughly mixed by being picked up by means of an excavating chain (8) and by being transported further to a throw-off point (24) behind the rear tracked chassis (6) and is thrown off back onto the exposed subgrade (19), whereupon a restoration layer (26) is formed by leveling and compacting the thrown-off subgrade.