The project consultancy studied the structure of the initial lining for the South entrance of the Rucorvo to Macchietto tunnel. The structures under examination were constructed in seven phases, briefly summarized below.
PHASE 1: Creation of the embankment behind the current route of road 51;
PHASE 2: Creation of a micropile screen;
PHASE 3: Creation of the foundation micropiles for the reinforced concrete slab on the valley side, and subsequent construction of the same slab;
PHASE 4: Creation of the foundation micropiles for the reinforced concrete slab on the mountain side, and subsequent construction of the same slab;
PHASE 5: Execution of soil consolidation in the excavation face position with fiberglass injections; creation of the arch structure in jet-grouting and the tie rods placed as a constraint of the soldier pile wall;
PHASE 6: Creation of the foundation micropiles for the curb to support the centering; construction of the same curb in reinforced concrete; setting up the pre-ring with centering;
PHASE 7: Cutting of the frontal micropiles and start of the excavation of the 1st field; construction of the pre-ring with centering;
PHASE 8: Excavation of half a section;
PHASE 9: Lowering excavation and casting of the inverted arch
