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  “TREVI-CALATORE”: innovation in cut and cover and tunneling for the installation of plunge columns aimed to excavate underground structures through the top-down method

  The installation of foundation elements (large-diameter Bored Piles or Diaphragm Walls) for the carrying out of underground works to be performed through the "Top Down" Technique (Stations, Car Parks, Subways, Artificial Tunnels) often implies the need to insert within said foundation elements, with pinpoint accuracy, some steel or prefab structures serving as provisional/definitive columns of the whole work structure. The “TREVI-CALATORE” system, developed for the construction of the new underground Florence station high speed railway line, allows to adjust the proper plano-altimetric installation of the plunge columns and their verticality. The project envisages the accomplishment of about 500 bored piles, 1200-1500-2100 mm diameter, with lengths ranging from 50 and 70 m. In the upper inner part of 250 piles, a steel column (weight: 15-20 tons, length: 22-25 mt.) is inserted with pinpoint accuracy.

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