RockXolid® 50 has been installed for
BERNMOBIL in the Bahnhofplatz
area. The solution was chosen based
upon performance, unique lifetime
expectancy and fast installation.

BUNDESGASSE

The streets around Bahnhofplatz are
undergoing refurbishment including
vibration isolation of the tramway
tracks. The first section is in
Bundesgasse, which runs one block
south of the Bahnhofplatz.

SOLUTION – ROCKXOLID VIBRATION ISOLATION MATS

BERNMOBIL has used stone wool for
vibration isolation for many years.
RockBallast® 50 was chosen as the
new and modern version which has
been developed and manufactured in
such a fashion as to prevent
deflections and to secure many
years of unchanged performance.

The stone wool is specially developed
for this kind of application (through a very
high density) and tested for a durability
which significantly surpasses the
expected lifetime of the other
components of the track. The dynamic
stiffness according to ISO 10846-2 and
the dynamic bed modulus according to
Deutsche Bahn BN 918 071-1 were
measured by Ingemansson Technology
on eight occasions during a fatigue
test of 100 million cycles. The changes
over time were negligible and the
permanent deflection is approximately 1.6mm – even after 100 million impacts.

SOLUTION ROCKXOLID VIBRATION ISOLATION MATS

RockXolid comes in a number of
versions, both softer and harder, to
comply with the requirements in
each installation. All solutions are
made of stone wool. The softer,
thicker solutions consist of two
layers.

VIBRATION ISOLATION MATS INSTALLATION

The installation was performed by in
the first half of 2007. As it can be
seen from the pictures, the mats
are easily cut to dimension. No glue
or other fixation is required. The
delivery was carried out in cooperation
with Flumroc, Flums, an
associated company of Rockwool in
the stone wool business in
Switzerland. The job was done by
Fa Kästli, who subcontracted it
to Fa Weibel.