Projects – Tunnels
Tunnels
THE MAIN TECHNICAL INDICATORS:
Length of the tunnel 1 764.5 m;
Width of the tunnel (in the light) 10.5 m;
Height of the tunnel (in the light) 8.5 m;
Niches in the tunnel 49 pcs;
Chambers in the tunnel 12 pcs;
Connecting cross-passages (with the old tunnel) 3 pcs;
Number of tracks 2 pcs;
Capacity of the tunnel 92 pairs/day;
Volume of ecavated ground 211 440 m3;
Metall temporary lining 2 565 tonnes;
Monolithic concrete temporary lining 32 374 m3;
Reinforcement permanent lining 4 741 tonnes;
Monolithic concrete permanent lining 49 414 m3;
Waterproofing membrane 66 925 m.
Tunnel drilling and blasting was carried ledge after ledge. At first, excavation is carried out on upper ledge (calotte) for the entire length of the tunnel, and then the lower ledge was being excavated. When excavating calotte, temporary support of the excavation was arranged with arches with shotcrete coating. The penetration of the lower ledge was carried out with the temporary fastening anchors and shotcrete on reinforcing arches. Concreting of permanent lining was carried out using a mobile formwork.
