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Jungfrau Zeitung – Replacement Spitallamm Dam – 2021 in the film

Kraftwerke Oberhasli AG | December 5, 2021

Since the foundation stone was laid in June, construction work on Lake Grimsel has been proceeding according to plan. The Interlaken filmmaker Christoph Frutiger captured the highlights of the third construction season in an impressive manner.

The third construction season of the replacement dam Spitallamm has been successfully completed. The construction site has been in hibernation since mid-November. Work on the construction of the new dam is expected to continue in May 2022. The highlight of the past construction season was the start of the actual concrete work. The client Kraftwerke Oberhasli AG and the construction workers of the Arge Grimsel celebrated the laying of the foundation stone for the new wall on June 23rd. Since then, the building of the century has been growing as planned.

400 concrete stages in four years

The new dam on the Grimsel is a so-called double-curved arch dam with a volume of around 215,000 cubic meters of concrete. The wall will be built in concrete stages with an average width of around 15 meters and a height of three meters. In the first phase of concreting, the main aim was to improve the processes, that is, to develop a routine, to become faster and still remain precise. The work in the high mountains is demanding, and the demands on concrete quality, material management and transport logistics are high. Around 35,000 cubic meters of concrete had been built by the end of the 2021 construction season. Around 16 percent of the wall has been built. In total, around 400 stages will be necessary for concreting the wall over a period of four years.

Key data replacement Spitallamm dam

Submission of planning application: May 2017

Start of building: June 2019

Construction time: During seven construction seasons, from May to October until 2025

Type: Double curved arch wall

Concrete volumes: 220,000 cubic meters

Costs: 125 million francs

Stauvolumen Grimselsee: 94 million cubic meters

The 2021 construction season in pictures

Spitallamm construction site in June 2021 before the start of the concrete work.Photos: David Birri

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