Case Study
Hydroelectric Power Stationsin Kempten

New construction and renovationof two hydro power plants in theimmediate vicinity of a planned
residential development

Planning and implementationof vibration mitigation measuresdespite dificult installation
conditions

Considerably below the required
limits for the neighbouring buildings

Elastic Mounting of MachineFoundations and Buildings

Description of the project The Getzner Solution
etzner was responsible for implementing the vibration isolation
during extensive renovation of theKeselstraße and Füssener Straße runof-the-river power stations on theIller. The challenge in this project wasto carry out vibration isolation while
complying with the increased emissions directives and to reduce structure-borne noise of the power station
machinery by the required amount.

GThe new power station building in theKeselstraße is directly linked with alisted historic residential area. The oldpower station building in the Füssener
Straße is a fully historical listed building For both projects, it was therefore
necessary to comply with increased
acoustic and vibration protection
requirements. While the Keselstraße
power station is designed for two hydraulic machines, the Füssener Straße
reservoir hydroelectric power station
has just one. The aim of the vibrationisolating measure was to effectively
protect the residents and the listedbuildings from vibrations and secondary airborne noise.

Effective protection against vibrationetzner Werkstoffe implemented afull-surface bearing for the power
station in the Keselstraße: The loorslab on which the two power station
machines stand is elastically-mounted
and minimises the vibration and acoustic transfer to the surrounding residential buildings. The side walls of thenew power station building were also
fully decoupled from their surroundings with Sylomer®, from the lower
edge of the loor slab to the top edgeof the ground beneath.

GThe listed power station building in theFüssener Straße also needed to be
eficiently protected against vibrations:“With its elastic bearing of the newmachinery foundation, Getzner has
made an essential contribution to
maximum acoustic isolation”, explains
Michael Lucke, managing director of
the operator, Allgäuer ÜberlandwerkGmbH.

Complete decoupling of the foundations with Sylomer® also guarantees
the acoustic and vibration protection
required here. Getzner irst determined, on the basis of the known
loads, the most suitable Sylomer®
types and then supplied the mats onschedule to the construction site.
Installation was carried out, under
the supervision of Getzner experts,
by the executing building irm. In totalaround 2,000 m2 of the material
Sylomer® was used. The overall solution takes into account the needs ofthe residents and also complies withthe stringent requirements for listedbuildings.

32Feedback
Planning – Concept – Implementation
The fact that Getzner was not onlyactively involved in the implementation but also in the planning process
particularly contributed to thesuccess of the project: Firstly, thecompany specialises in developing
and manufacturing materials forvibration reduction. Secondly it acts
as a technical building consultant.
With their calculations, its experienced specialistsprovided the technicalfoundations for the subsequentdecisions.
“We were able to offer a technicallytried and tested optimum solution withcommercially viable conditions. The
material itself is impressive: it has anhomogenous material structure, iseasy to install, absorbs very littlewater once itted and is easy to use,even in the event of local damage.
These arguments convinced the client”
explains Rainer Zindler, project manager at the Getzner site in Grünwald.

“The test measurements after completion of the project showed that all
residential compliance thresholds
were complied with. There is even asafety margin of error between theactual values and the specified
requirements. This confirms that themeasures for reducing vibrations andparticularly structure-borne noisetransfer have been extremely effective.”
Dipl.-Ing. Dr. techn. Hansjörg Schmid,
Ingenieurbüro für Technische Physik,
Hall i. Tirol“The Füssener Straße power station
was commissioned at the beginning ofMarch 2011 and is a shining example
of a calm and quiet operation. As aresult, the Kempten town council has
been asked to approve the building
area directly adjacent to the reservoir
hydroelectric power station for residential purposes.”
Walter Feßler, TNA department,
Allgäuer Überlandwerk GmbH

Vibration protection therefore
enables undisturbed use ofneighbouring facilities.

Pictures: 1 cover photo, 2 Brigida González | 1-4 By kind permission of AÜW4

Facts and igures at a glance
Keselstraße and Füssener Straße hydroelectric power stations in Kempten

Project duration:
Project completion:
Commissioning:

Allgäuer Überlandwerk GmbH, Kempten
Xaver Lutzenberger GmbH & Co. KG, Pfaffenhausen
RMD Consult, Munich
Getzner Werkstoffe GmbH
Pre-planning, project management andproject supervision, health and safety
planning for both power stations
11 months
End of 2010
Building and machine bearing
March 2011references

Keselstraße power station
Type:
Laufwasserkraftwerk
Year of construction:
1958 | new build – completed 2010
Vibration solution:
Full-surface elastic bearing of loorslab and decoupling of side wallswith Sylomer®
Füssener Straße power station
Type:
Reservoir hydroelectric power station
Year of construction:
1927 | reconstruction – completed 2011
Vibration solution:
Complete decoupling of turbine foundation

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CS KR en © Copyright by Getzner Werkstoffe GmbH | 10-2015

Operator and client:
General construction:
General planning:Vibration isolation:
Services: