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Kops II pumped-storage hydro-power station, Partenen/Montafon, Austria
Comprehensive formwork and scaffolding concept
for an unusual construction site inside a mountain
Since January 2006, work has been continuing on the development of the Kops II cavern power station. In a monumental rock cavity - 90 metres long, 30 metres wide and 60 meters deep – an underground structure with extremely impressive dimensions is taking shape. Construction work is carried on around the clock with only limited storage space and crane capacity available in the mountain itself. The Weissenhorn-based formwork and scaffolding specialist, PERI, provided a comprehensive concept for cost-effective erection of the massive reinforced concrete walls and slabs required for this very unusual construction site.
Forming the up to eight-metre high walls, with varying wall thicknesses between twenty centimetres and four metres, places enormous demands on the flexibility of the formwork system used. PERI TRIO panel formwork, with only one connection part for all element joints and using very few different components, fully meets these requirements. Adjustments and modification work for the different construction units with numerous box outs and reinforcement connections can be carried out quickly and efficiently on site.
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| PERI Systems In Use |
RUNDFLEX Circular Wall Formwork
HD 200 Heavy Duty Prop
TRIO
SB Brace Frame
ST 100 Stacking Tower
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Friedel Wurnitsch, Bernd Kiel, Johannes Pircher
The site supervision team
“With the TRIO, we were able to adapt flexibly to the various dimensions and forms with numerous box-outs. MULTIPROP and ST 100 were very adaptable construction elements for the massive slabs with floor heights from 4 m to 8 m. The service and co-operation with PERI Weissenhorn was excellent.”
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The Kops II pumped-storage plant is a parallel facility to the existing 247 MW Kops I storage power plant, which was commissioned in 1969. Mode of operation: with excess electricity from the network, water can be pumped from the lower reservoir in the Kopssee to the upper reservoir by means of pipelines. Whenever peaks in demand are reached, the water stored there can be converted into electricity within a few minutes. The Kops II cavern power plant has three vertical-shaft, 150 MW pump/turbine generators. The first is scheduled to be commissioned between the end of 2007 and the beginning of 2008, with the other two generators commencing operations later in the year. In future, high-quality peak-load energy and control current will be produced from renewable water power without the need of any additional water consumption.
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For single-face concreting, PERI TRIO is used together with PERI brace frames in order to safely transfer the fresh concrete pressure into the sub-structure. The modular brace frame units can be quickly and easily coupled for concreting heights up to 8.75 m without requiring any accessories. |
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The reinforced concrete slabs feature up to four-metre thicknesses in part. Loads resulting from this are correspondingly high but during formworking and concreting work, these are safely carried by PERI ST 100 stacking towers and MULTIPROP aluminium slab props. The lightweight individual components along with a simple assembly process for these two systems has proven to be particularly advantageous. The stacking tower can be quickly erected using only one frame size and few system parts. The type test facilitates planning procedures and has made time-consuming static calculations unnecessary. |
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In areas of large load concentration, PERI HD 200 heavy duty props have supplemented the PERI shoring concept. Also frequently used in bridge construction and during redevelopment work, the aluminium prop sections have an enormous load-bearing capacity (HD 200 = 200 kN) with low individual weights. The specially designed lowering device allows simple and controlled lowering with a standard commercially available cordless screwdriver, and under full load (20 tonnes)! |
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PERI could provide a cost-effective system solution for the main site entrance as well. For this particular task, PERI UP scaffold stairs are being used. Using a stair tower with alternating staircase units, the forty metre difference in height down to the working level has been quickly and safely mastered. The fact that versatile usable components reduce on-site material requirements and increase the degree of utilization, was taken into consideration during the development of the PERI UP system. Thus, the PERI UP Rosett module scaffolding system fulfils this additional application as a scaffold stairway with only three additional components - stair element, guardrail and landing link panel. |
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For the reinforced concrete lining of the underwater tunnel – constructed using conventional mining techniques – which leads to the discharge outlet, a PERI tunnel formwork carriage is being used. Wall and arched slabs are formed and concreted together. The complete unit is movable from cycle to cycle, and the user-friendly shuttering and striking procedures can be hydraulically controlled. For some concreting sections of the surge tank - this equalizes the pressure when opening or closing the gates - the continuously adjustable PERI RUNDFLEX circular formwork was used without anchors. Loads from the distribution walers were transferred into a centrally-arranged core by means of SLS heavy duty spindles. |
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| Client: |
ARGE Kavernenkrafthaus Kops II, Baulos 3
Jäger Bau GmbH, Schruns
Beton- und Monierbau Ges.m.b.H., Innsbruck
Ed. Züblin AG, NL Tunnelbau, Stuttgart
Alpine Mayreder Bau GmbH, Salzburg |
| Field Service: |
PERI Weissenhorn |
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Field Service:
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PERI Ges.mbH, Österreich
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PERI Press Release
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