Execution of redevelopment works on the pressure tunnel and of the free-surface diversion tunnel Regalbuto - Grottafumata for the hydroelectric power plant of Contrasto.

MAIN WORKS:

Laying of steel ribs in the tunnel (for the reconstruction of new sections) – kg 152322
Nails and anchor bolts – kg 67364
Concrete cutting with diamond disc – ml 38130
Demolition of concrete in the tunnel – cu m 188
High-strength concrete and beds 20/25 in the tunnel – cu m 433
Sprayed concrete in tunnel RCK 30 – cu m 1895
Electro-welded mesh in the tunnel– kg 70.645
Sealing of cracks in the tunnel – ml 11915
Tunnel boring of bores of diam. 25 – ml 31800
Tunnel boring of bores of diam. 45 – ml 6500
Injections of cement mortar – kg 58.800
Concrete waterproofing – sqm 3.997
Anti-explosion lighting system – ml 11.481
Emergency call installation, alarm warning system – ml 10064
Painting – sqm 6000