Railway Monitoring – Slab Track Monitoring, Kentish Town
Slab Track Monitoring, Kentish Town Summary:
Our client needed to identify the magnitude of vertical movement present in areas of failed concrete slabs when under train load.
- Movement was only present when under the load of a passing train, requiring a system capable of instantaneous measurement.
- Wet and dirty site conditions were likely to render optical systems impractical.
- Evidence of vandalism raised security concerns for equipment theft.
- Mains power and internet connectivity were not directly available on site, requiring a self-sufficient system.
Our proposal utilised displacement transducers which are telescopic tubes which measure changes in their length to sub millimetre accuracy.
By fixing one end to the existing stable slab and the other to the Tie Bars that span the defective slab section a vertical deflection value can be measured when under Train Load. The deflection value will therefore be relative to the existing stable slab position, and will not show if the ‘stable’ slab also settles under train load.
By mounting on the Tie Bar, the sensor will be raised slightly away from most of the dirt.
The value is intended to show how track geometry is affected by the failed slab section.
Figure 1 – Section Diagram
A baseline survey was undertaken to determine the current track alignment and to assess the impact of slab deflection on track geometry. This also highlighted any changes that occurred during the remediation works.
- The system served as an alarm should sudden failure have occurred.
- Post remediation, the monitor was used to assess the success of the remedial works by analysing the reduction in deflection.
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