A tunnel in PATHE (Patras-Athens-Thesallonica-Euzonoi), Greece

available by the Geoengineer website

This is a tunnel constructed in Pathe, out of Patras (photo1). The tunnel is supported by steel frames (photo2) which are joined together via bolts. After that, the steel form in photo 3 is entered in the tunnel on rails and through small "windows" covers the perimeter of the tunnel with concrete.

photo1

photo2

photo3

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