In the construction of the MO.S.E. system to defend the Venice Lagoon, Nautilus worked together with leading Italian companies on the maritime and underwater work in the entrances to Lido Treporti, Lido San Nicolò, Malamocco and Chioggia.
Nautilus worked on the majority of the temporary and permanent steel structures, by driving even very large metal elements, facing important challenges like the construction of submerged combi-walls with their heads at a depth of 17 meters below sea level, driving vertical and inclined circular piles with diameters up to 2100 mm, lengths up to 50 m and weights up to 70 tons, all driven in a single solution without any intermediate joining welds.
Nautilus also assisted in the greater part of the underwater work, including:
- Underwater levelling and laying geotextile or protection mattresses
- Laying gigantic reinforced concrete beds
- Cutting metal elements
- Underwater concrete casting
- Installing and recovering current meters and other scientific instruments
- Dredging and cleaning submerged surfaces
- Assistance in launching and installing prefabricated reinforced concrete caissons that form the support structures for the metal bulkheads.
These gigantic elements had a maximum length of 60 m, maximum width up to 45 m and height up to 14 m, with a weight of around 26,000 tons for each element.
Thanks go to the “Interregional Council for public works for the Veneto, Trentino Alto Adige, Friuli Venezia Giulia” for kindly granting us the use of the photographic material.