A Göschenen (UR) è entrata in azione, giovedì, la prima fresa per la realizzazione della seconda galleria autostradale del San Gottardo. Per scavare i 16,9 chilometri di tunnel saranno necessari altri tre macchinari dello stesso tipo.
La fresa scaverà, nei prossimi mesi, il cunicolo di accesso verso la zona di faglia settentrionale, si legge in una nota dell'Ufficio federale delle strade (USTRA). Una macchina identica sarà utilizzata anche da sud. Entrambe sono lunghe 200 metri e hanno un diametro di sette metri.
Il secondo tubo del San Gottardo viene realizzato 70 metri a est da quello esistente e sarà collegato al cunicolo di servizio. Gli scavi produrranno 7,4 milioni di tonnellate di materiale.
L'apertura al traffico del nuovo tunnel da 2,14 miliardi di franchi è prevista per la fine del 2029. In seguito, la prima galleria, aperta nel 1980, sarà chiusa e ristrutturata per tre anni.
Secondo tunnel al San Gottardo
Telegiornale 29.09.2021, 22:00
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