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Pressure Tunnel Ralco
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| Service: | NATM design and application support
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| Estimated cost: | Commencement: | June 29, 2001
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Completion date: | December 30, 2004
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| Location: | Alto Bio-Bio Chile |
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| Technical data: | Pressure tunnel with a lenght of 7 km (4.3 mi) and a diameter of 10 m (32.8 ft). Excavation in full face, top heading and invert according to encountered rock conditions. Initial support with lattice girders, steel fiber reinforced shotcrete and rock bolts. Grouting pipe spiling as pre-support for areas with deteriorated rock. |
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| Geology description: | Volcanic rock and tertiary sediments; lavas and lavas brechosas andesitas, lavas con niveles de conglomerados finos y arenisacas. Rock intrusions in the form of diorite and diabase. |
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| Bid cost: | Final cost: | $50,000,000
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