Working on a 35° incline
The concept of a "steep-incline milling machine" has proved successful and is widely used in reservoirs, canals and equalizing basins. "Embankments with slopes of up to 35° are no problem for our machines," explains Adrian Klossner from Reproad. Together with his experienced team, he has already completed numerous jobs on steep slopes.
Reproad is a Swiss company with locations in Zurich, Bern and Lausanne which specializes in the milling of pavements, concrete and rock, as well as shot peening and soil stabilization. Its fleet of machinery includes 60 Wirtgen milling machines, 7 of which have been converted for working on steep inclines.
"The customer must be able to work successfully and cost-efficiently with our machine technology, that is the most important thing," says Bernd Holl, Product Manager for cold milling machines at Wirtgen GmbH, explaining the simple concept behind customer satisfaction. "Our experienced technicians and site specialists provide professional advice on the planned application as well as during execution on the job site."
Refurbishment of a basin in Schwarzach
Inclined to mill
At the 50 year old Schwarzach power plant in Austria, the special-purpose machines were needed for general refurbishment of the equalizing storage basin with a capacity of 1.8 million m³. A 13-cm-thick layer of asphalt had to be removed in the 35-m-deep storage pond in Oberuntersberg, in the municipality of St. Veit, before lining it with a new surfacing of sprayed concrete and a special blend of watertight asphalt for hydraulic engineering purposes. The job called for professional expertise, special machines and cables to secure them.
Both the W 130 F, a front loader weighing 22 t, and the considerably heavier large milling machine of type W 2000 were secured in this way.
During the refurbishment of the basin, 12,000 m³ of bed-load material was produced which had to be disposed of. The storage basin equalizes the water volumes needed for operation of the power plant.
Replacement of the asphalt concrete seal
100,000 m² of steep-incline milling
The same machines were used to remove the 40-year-old asphalt concrete seal from the Latschau II storage basin operated by the Austrian utility company Vorarlberger Illwerke. The milling machines from Wirtgen worked their way through roughly 100,000 m² of old sealing material. The spent sealing material is recycled and used as reclaimed asphalt for paving existing farm tracks, such as those at Golm or Vandanser Ganeu.
When the milling work was complete, roughly 10,000 m³ of special asphalt concrete seal were applied to the bottom and embankment in two layers. The resultant 14-cm-thick layer will keep Latschau II watertight for a long time.