Project Name

Ceneri Base Tunnel - Lot 853 Underground Works

Project Type

Railway Infrastructures

Location

Bellinzona (Switzerland)

Client

Alp Transit Gotthard Sa - Bellinzona

Construction Period

2008 - 2014

INFRASTRUCTURE  nav RAILWAY  nav  Switzerland - Ceneri tunnel 853 - Vigana Portal
Switzerland - Ceneri tunnel 853 - Vigana Portal Switzerland - Ceneri tunnel 853 - Vigana Portal

Switzerland - Ceneri tunnel 853 - Vigana Portal

Lot 853 “Interventions on the North Portal Vigana area” consists of a twin-tube tunnel and two caverns, one of which is partially under the surface of the motorway. The external works consist of trenches dug perpendicularly to the slope of the motorway. The underground part starts with the external cavern, 232 m long, under the embankment of the motorway for 48 m. The first part of the excavation is carried out using the jet-grouting technique. The cavern proceeds in the rock with partial face excavation and finally it branches out into two tubes. The link (277m), like the eastern cavern, starts under the motorway embankment after which it proceeds in rock until it is transformed into the western cavern (405m).