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39
T
EXT IV
Read the text and translate it with a dictionary if necessary. Use the termino-
logical dictionary provided at the end of the present manual.
A
DVANTAGES OF SLAB TRACK
As part of quadrupling work at Best between Eindhoven and Hertongebosch, Danish
Railways (NS) has installed 3 km of slab track under a pilot project. Using a German
paving machine, the concrete trackbed has been laid at a rate of 30 m/h and at a cost of
2.5 guilders/km.
Although costing some 25% more than conventional ballasted track, the slab system
offers a number of advantages revealed by an earlier installation at Deurne that include
suitability for high-speed applications, very low maintenance requirements and a low rate
of rail wear. Rail corrugation appears after a period of 17 years, as compared with two
years for conventional track.
The running rails are embedded in the slab using a cork and polyurethane mixture, with
a tube conduit for cabling installed alongside the rail. Using the slab system with the low-
profile Sa 42 rail developed by NS and noise barriers placed closer to the rail than is pos-
sible with ballasted track, a reduction in noise emissions of 9 dB is forecast.
T
EXT V
Read the text and translate it with a dictionary if necessary. Use the termino-
logical dictionary provided at the end of the present manual.
V
ACUUM ESCAVATOR
Clearing drains and cleaning ballast following tracklaying on Norway’s Gardermo-
banen is the latest task to be completed by the innovative vacuum excavator developed by
Disab.
With only two operators, Railvac 16000 can move along the line to its required posi-
tion and within 2 min be ready to work. Because Railvac uses powerful air suction rather
than excavation with a metal grab, ditches can be dug with less waste and spoil, and ballast
can be cleaned quickly in situ. On the Gardermobanen, drainage channels were cleared of
construction dust and spoil by simple sucking it out at each end.
Nearly 605 of Railvac applications so far have involved cable work. Excavation of ca-
bles during track renewal work using suction is much less damaging to the cables, and in
six years only one minor cable damage incident has occurred. Up to 200 m
3
of material
can be excavated in 8 hours.
To clean the ballast, the Railvac nozzle is buried in the ballast and moved around on its
flexible hose. Depending on the suction setting, only dirt, litter and small stones are re-
moved, leaving the ballast itself in place. Railvac can also act as a tamper with the nozzle
directed under the rail by one person; this is especially effective on bridges.
Disab has sold six machines at a cost of US$1m each. Three are at work in Sweden,
one in Norway, one in Slovakia and one on Hong Kong’s Mass Transit Railway.
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