Infrastruktur,
Tunnel og tunnelrehabilitering,
Trafikktunneler
Secondo tubo San Gottardo - lot 241, hovedtunnel nord
(Mesozoic with Jurassic and Triassic, Permo-Carboniferous) and then the Gotthard massif (northern paragneiss zone, Gamsboden granite gneiss). Rocks encountered: Aare granite, gneiss, calcareous schist, clay schist, sericite schist, Zweiglimmer gneiss and granite gneiss. Byggingen av det andre røret vil føre til [...] driver den andre delen opp til partigrensen. In detail, the following main works will be carried out: Construction 2nd stage Pre-cut 2TG, excavation volume: 24'000 m3 ; Loose rock section main tunnel excavation area 180 m2 , length 86 m ; Construction of the underground concrete center, WELK and segment [...] m; Blasting widening of the main tunnel for 2 display bays (length 70 m each) and 10 overbursts (length 37.5 m each); Work for waterproofing, interior vaulting, intermediate ceiling, interior finishing, mastic asphalt and surface coating of the main tunnel; New construction of Göschenen ventilation center[...]