In February, Cranes Today covered how a LTR 1220 telescopic crawler crane picked and carried concrete slabs to build a water basin reservoir for a pumped-water energy storage system.

The LTR 1220 assembled the total of around 200 curved wall segments which make up one of the basins, so-called passive basins.

For the next stage of the project, Max Bögl is using an LTM 11200-9.1 to erect the 40m high active basins. These towers, and the wind turbines, will be completed using a Liebherr 630 EC-H 70 top-slewing tower crane, which will eventually rise to 190m.

The active basins, on which the wind turbines will be erected, consist of 27 prestressed concrete rings. The LTM 11200-9.1, fitted with 202t of ballast, is hoisting the massive components onto each other. The nine-axle crane is handling a load of over 90t for this purpose.

The enormous concrete rings are supplied in four individual segments, which are assembled on site and stressed using steel cables. The finished component has a diameter of 16m and is 1.5m high.

The Liebherr LTM 11200-9.1 will then also place some of the turbine towers on the 40m high reservoir and will also assemble the Liebherr 630 EC-H 70 top-slewing crane required to complete the job on the reservoir tower.

According to Liebherr, the four wind tubines to be erected will be the tallest in the world, at a total height of over 240m.

The turbines are due to go onto the grid before the end of 2017 whilst the pump accumulator system is to go into service at the end of 2018 at the latest.

The system will be able to generate additional electricity when demand is high through its combination with a pump accumulator power plant in nearby Kocher Valley.