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Track Maintenance and Renewal
For railways around the world, line speed restrictions and expensive and disruptive track maintenance are frequently caused by poor track geometry and misaligned rails. But Tensar’s technology offers a solution proven to substantially reduce track maintenance. The subject of extensive independent research and development and approved by Network Rail in the UK and National Rail Authorities worldwide, our geogrids have been used since the early 1980s to stabilise track ballast.
How you can benefit
Compared with traditional trackbed construction, creating a mechanically stabilised ballast layer can:
- Maintain track geometry for longer
- Reduce the rate of ballast settlement
- Reduce maintenance induced ballast degradation
- Extend the maintenance cycle by a factor of around three
- Stabilise ballast for well over 20 years
The construction of new track over weak or variable subgrades can benefit from Tensar geogrids to provide soil reinforcement of embankment foundations and also to mechanically stabilise granular sub-ballast layers, reducing their thickness by about a third.
How you can benefit
Compared with traditional trackbed construction, creating a mechanically stabilised sub-ballast layer can:
- Cut construction time and costs by reducing the sub-ballast needed for the same bearing capacity
- Subgrade excavation depths and resulting spoil quantities can be reduced
- Reduced materials quantities deliver a more sustainable solution
The two major trackbed application areas
There are two ways in which Tensar geogrids can be used to stabilise railway trackbeds:
- Reinforcing the ballast layer reduces ballast deformation and the rate of track settlement to extend the maintenance cycle with huge whole life benefits
- Improving the track foundation by stabilising the sub-ballast layer increases the bearing capacity over soft subgrade, reducing sub-ballast thickness with time, cost and carbon savings.