Case Study
Rettenbach Power Stationin Sölden (AT)Vibration isolation for protection of
the school building and the hotel
complex which are directly adjacentto the power station

Prevention of acoustic bridges
despite complex base geometry

Proven effectiveness: measured
vibration values below the humanperception threshold

Elastic Mounting of
Machine Foundations
and Buildings

Description of the project The Getzner Solution
Hydroelectric power station inRettenbach

No vibration or acoustic transfer
thanks to Sylomer®

or sustainable energy production,
Wasserkraft Sölden Gen.m.b.H hasbuilt a hydroelectric power station.
The system uses the power of theRettenbach, which flows through theborough, directly alongside the primary and secondary school, and also
harnesses power from the Zwieselbach. The borough stipulated that theschool activities must on no accountbe affected by turbine vibrations or
noise resulting from the implementation of the hydroelectric powerstation.

etzner is a vibration isolation
specialist for machine foundations
and buildings. Therefore the engineers,
Ingenieurbüro Sprenger from Innsbruck, appointed Getzner in the initialproject phase to develop a concept forvibration isolation of the power station.
The Getzner engineers calculated theoptimum natural frequency for theelastic mounting of the power stationbuilding on the basis of the disruptive
frequency data from the turbine
manufacturer. Getzner was responsible
for the dimensioning of the elastic
mounting and for the selection andlaying of the materials .

FThe power station is directly adjacentto the school building which houses
the local kindergarten. Access to anunderground garage, which is connected to the school building, travels
directly beneath the power stationbuildings. A luxury hotel is also locatedin the vicinity of the power station.
These complex surrounding conditions
placed particular demands on those
responsible for the project in terms ofvibration isolation. The different dropsof the two rivers meant that two turbines had to be installed and therefore
two sets of vibrations needed to beisolated.

G

Tailored concept – expert
implementation
The power station building waserected on a full-surface vibrationisolating layer. The Sylomer® matsdecouple the whole building fromits surroundings, thus minimisingvibration and noise to neighbouringbuilding areas.
In addition, large-scale side installations decouple vibrations in thedirection of the school building.

Despite the difficult conditions, theGetzner specialists fitted all theinsulation material within three days.
The compact architecture resulted in
a complicated base geometry: Despite
frequent variations in the substratelevel, “acoustic bridges” weresuccessfully avoided.

Getzner Performances: Materials,
planning and implementation— Calculation of material
requirements— Use of materials developed
in-house— Individual reconciliationof the solution— Consultation support basedon experience and expertise— Expert implementation ofthe vibration solution— Success monitored by test
measurements

Demonstrably effective vibration
protection
Getzner Werkstoffe not only designs
and manufactures materials forvibration reduction, it is also anexperienced building consultant andsupports companies in projects fromplanning to success monitoring. In theRettenbach hydroelectric power
station project, extensive vibration
and acoustic measurements demonstrated the effectiveness of theimplemented vibration solution: Bothin the school rooms and outdoors, themeasured vibration values lie belowthe human perception threshold. The
decoupling of the power station fromits surroundings prevents vibration
and acoustic transfer to the adjacentschool building and the neighbouring
luxury hotel. Professional vibration
protection therefore enables
undisturbed use of neighbouring
facilities.

Feedback

Measurement details“Getzner advised us in a highly
competent manner while the power
station was being built. The proximityof the power station to the school andhotel buildings made working conditions difficult. This made the company's extensive vibration insulation
experience particularly valuable inthis project. The fact that Getzner
develops and also produces thematerials in-house is a clear benefit.”“The maximum vibration severity (KBFmax in accordance with DIN 4150-2)
at full load of both turbines is 0.021 in
the adjacent school and 0.045 in theoutdoor area. This is far below the human perception threshold. Even in theunderground garage, the maximumvibration severity (KBFmax in accordance with DIN 4150-2) is 0.011 which isconsiderably lower than the perceptible range. The structure-borne noise
difference between the vibrationsof the machine foundations and themeasured values in the school is 33
dB. The structure-borne and airborne
noise measurements therefore confirm the effectiveness of the technicalvibration measures implemented inthe Rettenbach power station.”

DI Thomas Sprenger,
Ingenieurbüro Sprenger

See measurement report, KW
Rettenbach, DI Markus Heim,
September 2010

Acoustic bridges were prevented despite difficult base geometry.

Facts and figures at a glance
Rettenbach hydroelectric power station

Installation date:Completion:
Contract value:

Wasserkraft Sölden Gen.m.b.H
Engineers, Ingenieurbüro Sprenger, AldransThurner Bau, Imst
Getzner Werkstoffe GmbH
Vibration isolation of the power station from the adjacentschool and kindergarten building and hotel complexes
with the use of Sylomer®
Autumn 2008
Autumn 2009
EUR 63,000.00

Getzner Werkstoffe GmbH

Construction references (Extract)

Foundation:— Skyline Vienna, Vienna (AT)— Oslo Opera, Oslo (NO)— Drachen-Center, Basle (CH)— The Rushmore Building, New York (US)— Bolshoi Theatre, Moscow (RU)
— Theatro National de Catalunya,Barcelona (ES)— Welfenhöfe, Munich (DE)— Arnulfpark, Munich (DE)— Vier Sonnen luxury residential
complex, Moscow (RU)
— Füssener Straße and Keselstraße hydroelectric power stations, Kempten (DE)1969 (as a subsidiary of Getzner,Mutter & Cie)
Chief Executive Officer: Ing. Jürgen Rainalter
Employees:
380
2016 turnover:
EUR 80.4 million
Business areas:
Railway, construction, industry
Headquarter:
Bürs (AT)
Locations:
Berlin (DE), Munich (DE), Stuttgart (DE),
Lyon (FR), Amman (JO), Tokyo (JP),Pune (IN), Beijing (CN), Kunshan (CN),Charlotte (US)
Ratio of exports:
90 %AUSTRIA — Bürs GERMANY — Berlin — Munich — Stuttgart FRANCE — Lyon
JAPAN — Tokyo INDIA — Pune CHINA — Beijing USA — Charlotte

JORDAN — Amman
www.getzner.com

CS KR en © Copyright by Getzner Werkstoffe GmbH | 11-2017

Client:Planning:
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Vibration isolation:
Solution: