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For both tasks, a Sika PM 407, with an Aliva Vertical Shaft 302 telescopic arm, in combination with the The main tunnel ends in a cavern, which was new Aliva Converto RoboSpray, were used for ideal for the assembly of the ALIMAK machine the application of the shotcrete. Aliva Converto that dug the 123 m (404 ft) deep shaft. It was RoboSpray’s spraying device was ideal for this comprised of three segments: the 91 m (300 ft) application and has exhibited outstanding main shaft, a 33 m (110 ft) high water lock, and spraying results. the transfer into the ventilation tunnel. The disas- Thanks to the easy and quick handling of the sembly cavern for the TBM was built at the Aliva spraying arm, the critical part of the tunnel crossing of the main to the vertical shaft. could be completed without a hitch. The vertical shaft was also built using an Aliva 257. This was done together with a conveyer belt Mechanical TBM Drive and its powder dosing machine right at the bottom During a driving break in the tunnel, an open of the vertical shaft. TBM from Robbins was assembled. The Robbins The material was conveyed on a mobile TBM bored the main tunnel without any consid- batcher to the portal, and from there it was further erable breakdowns. An Aliva 257 top was transported to the spraying machine by a dumper. mounted on the TBM. The machine was charged The air supply provided was ideal, such that the with a train and a shotcrete carrier. The shotcrete complete shaft up to 123 m (400 ft) could be carrier was offloaded from a discharging belt on sprayed without any problems. to a steep belt, which loaded the Aliva 257. On this construction site, the Aliva machine’s Aliva 257 provided the best solution thanks to their easy handling, low maintenance, and high reliability, as well as the availability of the machines. The smooth execution, however, was essentially the work of the highly skilled operating team on site. Finishing Up and Project Conclusion After completion of the tunnel advancement, a fiber-reinforced shotcrete lining will be applied in the entire main tunnel. The Sika PM 407 and the Aliva spraying arm Aliva 302 will once again be on hand to get the job done. The finishing touches to the inner lining are made of a steel pipe, which runs throughout the entire tunnel. This project has proceeded without problems Spraying device for dry-mix shotcrete spraying (behind the drill head) and on schedule thanks to vast experience and extensive know-how in tunnel and shaft construc- tion as well as the reliable performance provided by Aliva machinery. Sascha Schreiner is Head of Marketing, Service and Logis- tics, for Sika Schweiz AG of Widen, Switzerland. He com- pleted his degree in civil engi- neering at HTW University of Applied Sciences in Saar- brücken, Germany, and has been responsible for sales, service, product development, and business line integration for the Sika Schweiz line of Aliva Shotcrete Equipment. Aliva shotcrete machines have been used exten- sively for many decades on major mining and Spraying machine Aliva 257 with on-site conveyer belt tunneling projects around the world. 20 Shotcrete • Spring 2014


2014SprShotcreteEMag
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