RockBallast® 3515 has been installed
for the third phase of the
Copenhagen Metro at several sections
covering about 13,000m² in
all. RockBallast 3515 was chosen after
studies and investigations of
insertion loss and cost-effective
installation. The solution was chosen
by performance, lifetime and fast
COPENHAGEN METRO – PHASE THREE
The Metro uses driverless trains
from the Italian company Ansaldo.
Each unit has three cars with wide
aisles and sliding doors for ease of
access. It has seats for 96
passengers and standing room for
204 more. Each car has six sets of
automatic double sliding doors, and
call points from which passengers
can communicate with the main
control centre. The maximum design
speed is 80km/h (50mph).
The trains operate 24 hours a day,
with intervals as short as 90s
at peak times. The third phase of the Copenhagen
Metro extends from Lergravsparken
to the Copenhagen Airport. It is 4.5km in all with five new stations, and the total cost will be around €200 million.
Most of the line is on the ground in
the open. On certain sections it runs
in an open-air tunnel.
It opened in 2007.
SOLUTION ROCKBALLAST STONE WOOL VIBRATION ISOLATION MATS
To reduce the vibration mitigation from
the tramway track to the surrounding
houses a vibration isolation system was
applied. RockBallast 3515 was chosen
as the elastic part. RockBallast 3515 consists of stone
wool mats covered by a geogrid. The
mats have a dual density with the hard
layer upwards and the soft layer
downwards to provide the proper
The installation of RockBallast 3515
took place in the summer of 2005 and
was performed by Arkil-Novejfa.
The mats are being laid out – protected by a coverage of geogrid
– and finally covered by ballast