Impresa Pizzarotti & C. S.p.A.

Grenoble - France
The project consists of two double-barrel tunnels at "Uriol" and "Petit Brion". Uriol has a Jurassic-era lime-scale massif, while the Petit Brion crosses a lime scale quartz-clay massif. Both tunnels were excavated mainly through full-section explosives. Support systems were built by availing of the Austrian procedure which envisages nailing and the subsequent use of spritz beton.

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