LONDON UNDERGROUND
London Underground: sleeper pads for efficient
protection
Getzner Werkstoffe project manager Lukas Mayer discusses a Tube track renovation scheme.
T
he track of the London Underground District Line was completely renovated
between Paddington and High Street Kensington stations in the city centre. Around 173 million passengers use this line every year. Between July and August 2011, this very busy section of track, which is also part of the Circle Line, was upgraded with new ballast, rails and brand new sleepers with pads supplied by Getzner Werkstoffe. The elastic bearings on the sleepers protect the track superstructure and reduce the level of vibrations caused by the rail traffic. The latter also has a beneficial effect on the numerous dwellings alongside the track
and noticeably improves the quality of life of local residents.
The Getzner Solution: Padded railway sleepers as protection against vibrations
Providing elastic bearings for this stretch of the District Line was the first sleeper pad project for London Underground: the requirements called for the use of full-surface Sylodyn sleeper pads.
Deliveries were made both to the CEMEX sleeper works and directly to the operator. This renovated section of the District Line runs through very narrow tunnels. The tight track meant that the spacing between individual sleepers had to be closer than normal.
A particular challenge in this case was to prevent this closer spacing from causing in an increase in the level of sound transmission through the tunnel walls. Getzner found the solution for this as well: the elastic Sylodyn bearings were for the first time placed not just on the bottom of the sleepers, but also on their sides. Stefan Potocan, Rail Product Manager at Getzner, said: “These lateral bearings enabled us to drastically reduce the transmission of sound and vibrations through the tunnel wall and also enhanced the vibration-isolating effect. Both the functionality and the price/ performance ratio of the proposed solution greatly impressed the customer.”
FOR MORE INFORMATION Visit
www.getzner.com
rail technology magazine Jun/Jul 12 | 47
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