Railway Vehicle Ballast Stabilization for Track Renovation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current rail vehicle systems require multiple tamping processes after track renovation, delaying the reopening of tracks to high-speed traffic and involving noisy operations, especially when dealing with curved sections.
Innovation Solution
A rail vehicle with integrated features such as a two-layer ballast bed application, pre-compaction, and a tamping unit, along with a ballast bed clearing and application system that includes counter-rotating screw conveyors for low-noise operation, allows for single-pass stabilization and superelevation of tracks, eliminating the need for subsequent tamping in most cases and enabling immediate medium-speed usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional track renovation methods are used with single-layer ballast application, then the renovation process is simpler, but multiple tamping processes are required after renovation, delaying track reopening
Solution Approach 1:
The patent applies preliminary action by performing ballast pre-compaction during the ballast application process itself, rather than waiting until after track renovation is complete. The lower ballast layer is compacted in advance before the upper layer is applied, eliminating the need for subsequent tamping operations and enabling immediate track usage.
Solution Approach 2:
The patent segments the ballast bed into two distinct layers with different compaction states. The lower layer is pre-compacted during application, while the upper layer remains loose. This segmentation allows the track to be immediately usable for medium-speed traffic while still permitting future high-speed operations after additional compaction if needed.
2Reliability
If vibratory plates are used for ballast compaction, then compaction is effective, but noise levels are high
Solution Approach 1:
The patent replaces the vibratory mechanical compaction system with a static mechanical compaction system. Instead of using vibratory plates that generate noise through vibration, the invention uses the weight and pressure of the rail vehicle itself to compact the ballast, achieving effective compaction without the harmful noise associated with vibratory equipment.
3Stability of the object's composition
If track superelevation is required for curved sections, then track stability in curves is improved, but additional operations are needed to remove and rebuild superelevation during renovation
Solution Approach 1:
The patent applies local quality by creating a wedge-shaped ballast distribution where the lower ballast layer has varying thickness across the track width. This localized variation in ballast depth directly creates the required superelevation for curved sections, allowing the track to maintain its curve-specific geometry without requiring separate operations to remove and rebuild superelevation.
4Manufacturing precision
If multiple tamping processes are performed after track renovation, then final track alignment is achieved, but the renovation process is extended and noise is increased
Solution Approach 1:
The patent performs the tamping action preliminarily during the ballast application process itself. By compacting the lower ballast layer in advance while the rail vehicle is still positioned on the track, the alignment and stabilization actions are completed before the renovation is finished, eliminating the need for subsequent tamping passes and reducing both time and noise.
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 accelerates track renovation, reduces noise, and allows for immediate medium-speed usage after processing, with optional final tamping for high-speed readiness, while also simplifying the renovation of curved sections by integrating superelevation and stabilization in a single operation.
Implementation Method 1
a compacting device for compacting the lower layer of ballast bed
Implementation Method 2
counter-rotating screw conveyors for low-noise operation
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
Rail vehicle (1) for track superstructure rehabilitation, with at least two bogies (8', 8", 8''') and a working area (A) between them, in which the rail vehicle (1) has successively along the direction of travel (F) a derailment device (25) for old rails (6'), a removal device (27) for old sleepers (5'), a ballast bed clearing device (29), a ballast bed application device (40), a laying device (52) for new sleepers (5") and a threading device (54) for new rails (6"), wherein the ballast bed application device (40) successively comprises a first ballast application device (41) for applying a first ballast layer (3a), a compaction device (42) for compacting the first ballast layer (3a), and a second ballast application device (43) for applying a second ballast layer (3b).