Thanks to the use of four hand-held Darda C12 N Rock and Concrete Splitters with high-pressure electric power units, Sparal Oy, a demolition company based in Vaasa, Finland was able to successfully complete this project. At the Wärtsilä Diesel 18V46 (G1) thermal power plant in Mariehamn, a massive, heavily reinforced concrete machine bed had to be demolished that was four meters wide, 2.5 meters high and 17.5 meters long, with a deck thickness of 1.3 meters.
When the 320-ton, 10-MW power plant and generator were driven into the building in 1990, the front wall of the former coal-fired power plant was demolished. When this project was undertaken, it was also thought that this brick wall, about 10 m wide and 20 m high, would also have to be demolished again.
For the use of the splitting equipment, 45 mm holes were drilled into the unreinforced areas with a pneumatic drill. Holes of 100 mm were drilled into the concrete sections that had been very strongly reinforced with the help of diamonds in order to use the Darda splitting cylinders including pressure shells for splitting.
Thanks to the use of Darda splitting equipment, it was possible to save both the demolition of the facade and the costs of reconstruction, so that the building services did not have to be demolished/relocated in this part either. The Darda splitting cylinders made it possible to carry out the work with much smaller demolition machines and still meet the schedule for the Wärtsilä power plant in Mariehamn.
Company: Ab Sparal Oy, Vassa, Norway https://www.sparal.fi