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Il Consiglio federale ha approvato mercoledì il progetto generale per la costruzione della seconda canna della galleria autostradale del San Gottardo. Ora si tratterà di approfondire lo studio. I costi ammonteranno a circa due miliardi di franchi.
Il nuovo traforo sotto il massiccio si affiancherà a quello esistente a una distanza di 70 metri. I portali di Göschenen e Airolo costruiti per il primo scavo saranno utilizzati anche per il secondo.
L'avvio dei lavori principali dipenderà dall'iter di approvazione dei piani e di eventuali ricorsi; nella migliore delle ipotesi è previsto per il 2020, mentre la costruzione grezza è attesa non prima del 2025. Seguiranno l'installazione degli impianti elettromeccanici, la posa della pavimentazione, infine i lavori conclusivi e i collaudi. L'apertura della nuova canna è prevista non prima di fine 2027. Il cantiere, viene ricordato nel comunicato, non inciderà sull'operatività di quella esistente e non comporterà limitazioni alla circolazione.
A lavori ultimati la nuova canna sarà a percorrenza bidirezionale e inizierà il risanamento della prima, attualmente previsto dal 2028 al 2030.
ats/joe.p.
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