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2014SprShotcreteEMag

Job Report on Hydropower Station in Stanzertal, Austria By Sascha Schreiner Ihydropower station construction site: excavator, and power station—not to mention the crossingthe Tirol area. Due to its alpine location as wellas its close proximity to the nearby water basint is remarkable that three different tunnel-building methods are being used on this drill and blast, and tunnel boring machine (TBM) of two existing tunnels—construction work has advancement. In addition to the normal horizontal been very complex and, to a certain extent, only tunnel, a vertical shaft is also being built. done under extremely difficult conditions. Con- In all tunnel-building methods, Aliva machines sequently, flexibility and reliability of the oper- and Sika concrete products—such as the rotary ating team’s skills, as well as those of various machine Aliva 257 Top, the telescopic spraying suppliers/subcontractors, have continually been arm Aliva 302, the Aliva 400 Spraying robot, and in demand. The building site facilities, which the Sika PM 407 concrete pump—are being put to include the construction infrastructure and the the test. The new Aliva spraying device for robotic logistics area, are found on the west portal of the concrete spraying—the Aliva® Converto RoboS- site. That is also where the entrance of the tunnel pray—is also in operation for shotcrete application. and the disposal area for approximately 100,000 m3 The following Sika chemicals are being used: (130,000 yd3) of excavated material can be found. Sigunit® 49 AF (25 kg 55 lb bags) and Sigunit L-93 AF liquid accelerator. Shotcrete for dry Project Data concrete spraying has been produced directly on • Construction time: March 2013 to September 2014 the construction site in a separate concrete • ca. 1700 m (5600 ft) conventional drill and blast, batching plant. excavator The project aims to combine the use of water • ca. 3800 m (12,500 ft) machine advancement from the local mountain river along with treated • ca. 130 m (430 ft) ALIMAK—advancement waste water that was collected and combined in • 3.81 m (12.5 ft) TBM—diameter a buffer tunnel and then fed into the new hydro- power station. Project Execution The project consists of a main and a secondary Location and Preparatory Work tunnel, and a vertical shaft which, upon comple- The construction site of this new hydropower tion, will all be connected. In addition, there are station is located in the western part of Austria in other buildings on site for energy production Cross-sectional diagram of project 18 Shotcrete • Spring 2014


2014SprShotcreteEMag
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