Rock Products

OCT 2018

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24 • ROCK products • October 2018 www.rockproducts.com V olvo Construction Equipment (Volvo CE) and Skanska are trying to turn the quarry industry upside down with a groundbreaking study to create the world's first emis- sion-free quarry. Drawing on the electro-mobility and automation expertise of the Volvo Group, the research project, dubbed Electric Site, aims to electrify each transport stage in a quarry – from excavation to primary crushing, and transport to secondary crushing – although a negligible amount of diesel power will still be used. The system's efficiency, safety and envi- ronmental benefits are set to impact both customers and society at large. Volvo CE and Skanska began testing the Electric Site concept on August 29 th at Skanska's Vikan Kross quarry near Gothen- burg, Sweden, which produces aggregates for construction purposes as well as for asphalt and cement. Production will run for 10 weeks and has been designed to achieve the same output as Skanska's usual equipment but, crucially, with up to 95 percent lower carbon emissions and up to 25 percent lower total cost of operations. "This is the first time that anything like this has been attempted in the quarrying industry and, if successful, Electric Site could serve as a blueprint for transforming the efficiency, safety and environmental impact of quarries around the world," said Gunnar Hagman, CEO of Skanska Sweden. With Electric Site, Volvo CE and Skanska are challenging traditional ways of working in the quarrying industry. The project has involved developing new concept machines, work methods and site management systems which together form a complete site solution. New technology encompasses machine and fleet control systems and logistic solutions for electric machines in quarries. "We have had to completely rethink the way we work and how we look upon machine efficiency – pushing the bound- aries of our competence," said Melker Jernberg, president of Volvo CE. "The total site solution we developed together with our customer Skanska is not a commercial solution for sale today and we will evaluate the outcome of the tests but we have learnt so much already, elements of which will be fed into our future product development." From Elephants to Ants Three rigid haulers, for example, have been replaced by eight smaller prototype HX2 autonomous, battery-electric load carriers to transport the material from the primary mobile crusher up to the secondary static crusher. The protoype has advanced significantly since the HX1 was first shown to customers and members of the international press at the Volvo Exploration Forum in September 2016. "The HX1 was our proof of concept," explained Uwe Müller, chief project manager for Electric Site at Volvo CE. "Once we knew it was feasible, we updated the design requirements for the HX2 to incorporate shared technologies and components from the Volvo Group, such as electric motors, batteries and power electronics. Integrating a completely new drivetrain was crucial to take full advantage of the groundbreaking electro-mobility developments that are happening inside the Volvo Group. Another new feature is the addition of a vision system, which allows the machine to detect humans and obstacles in its vicinity." Electric Upgrade The primary crusher on the Skanska site is loaded by the 70t dual-powered, cable-connected EX1 excavator prototype, which had not previously been seen by customers and press. The Emission-Free Quarry Efficiency, Safety and Environmental Benefits Could Impact Both Customers and Society at Large. By Mark S. Kuhar No-Emission Quarry Joakim Käpynen, production manager at Skanska's Vikan Kross site and Uwe Müller, chief project manager for Electric Site at Volvo CE.

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