The HS 8130 HD duty cycle crawler crane was manufactured in spring 2016 at Liebherr's site in Nenzing, Austria. It has two hydraulic free-fall winches, each with a line pull of 35 tonnes – approx. 17 per cent more than in the predecessor model (HS 885 HD). "The outstanding features of the duty cycle crawler crane are its 200-metre winch capacity and its higher rope speed, which is automatically adjustable using a dual motor," says Florian Gabriel, Product Manager for Liebherr at Nenzing. In three months, we had built the machine and fitted it with a clamshell grab specially designed for the assignment in Ticino. This flame-red tool from Italian grab specialist Negrini has a filling capacity of ten cubic metres. The grab manages an average handling capacity of 130 cubic metres per hour.
An average of 180 million cubic metres of water flows through Olivone power plant's turbines each year. Around 234,000 megawatt hours of energy are generated in this way. The same water then flows on to the Bianca power plant and generates a further 304,000 megawatt hours of electricity there. The power plant thus makes a substantial contribution to the region's electricity supply. Provided, that is, that the water can pass unimpeded through the outlet.
"At first, the operators planned to use a crawler crane to do the dredging work," says Florian Gabriel, referring to the initial plans. But on closer inspection, he quickly realised: "You need a duty cycle crawler crane." Otherwise, it would have been impossible to achieve the high throughput of sediment that was required. "The 200-metre winch capacity and the higher speed are essential for this job," says Gabriel. Another key factor in the award of the contract was Liebherr's servicing and customer service provision in Switzerland, involving relatively short journeys to the reservoir from the plant in Austria or from the Swiss distribution and service company's site.