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2014SprShotcreteEMag

Telescopic spraying arm, Aliva 302. An automatic measurement system was installed into the road tunnel to detect any potential settlements at an early stage and administrative work. All operations, such as the construction of the main and secondary tunnels, as well as the vertical shaft and the exit tunnel, were planned and adjusted to a fixed project time schedule. The length of the sec- ondary tunnel is around 1000 m (3300 ft), with the main tunnel measuring approximately 4000 m (13,000 ft). The vertical shaft is 123 m (400 ft) and the exit tunnel 416 m (1360 ft) long. Because the crossing of the road tunnel has just a 4 m (13 ft) overlay, the last 100 m (330 ft) had to be built on a smaller scale. Additionally, three caverns were planned for tunnel crossings and machinery disassembly. Excavating and Driving the Tunnel Approximately the first 100 m (330 ft) of each portal were driven using a normal excavator because of the loose stones and sand on the moun- tain’s slopes. Using the same procedure, the secondary tunnel was also constructed. The entire secondary and exit tunnels were driven by drill and blast due to the geological configuration and other marginal conditions, such as the nearby road and train tunnels. Spraying machine (rotary) Aliva 257 Shotcrete • Spring 2014 19


2014SprShotcreteEMag
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