Ballast Renewal – Filtration and Confinement
The Spitze ballast-cleaning train is used extensively to deal with contaminated ballast. Running at 3m/s, the train lifts a length of the track, extracts, then washes and replaces the ballast. The track is then lowered back in to place.
This exercise is also a good opportunity to deploy a geosynthetic to combat the contamination problem and extend the maintenance interval. On this occasion, RK4 – a textile/grid composite, was installed to stabilise the ballast/subgrade interface and reduce the upward movement of subgrade fines.
Using the 30m long by 3.2m wide composite, avoided the complication of controlling two separate products and the result was a faster installation.
In 2010 Geofabrics launched a new anti pumping geocomposite in the UK, which could be used to prevent the development of mud pumping.
This paper describes the development process undertaken to produce a lightweight, geosynthetic filter to replace a sand-blanket used within trackbed.
TrackTex™ Anti-Pumping Geocomposite was used to to provide an increased form of ballast protection in known trouble areas in Christiansburg, Virginia.
TrackTex anti-pumping geocomposite was selected by Network Rail as a method of preventing mud pumping and prolonging trackbed performance.
Geofabrics' CuTex copper composite root barrier protects rail infrastructure from Japanese knotweed.
A statement by Gordon Donald, Managing Director of Geofabrics, regarding the judgement on patent infringement by Fiberweb Geosynthetics Ltd.
TrackTex was installed on a frequently trafficked diamond crossing as a long-term effective remedy to frequent fouling caused by mud-pumping.
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