Inside the tunnel
The tunnel is constructed using a method similar to the dome construction. A 215-foot long Airform is inflated in a trench then workers go inside, apply 1.5 inches of polyurethane foam, attach steel, and spray layers of shotcrete. The finished wall is 14 inches thick with dual-layers of reinforcing steel rebar.
Image by South Industries
Posted to Dome Construction Is Nearly Complete for Las Vegas Gypsum Storage
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