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Il danno creato dal cedimento di una parete all'interno della galleria del S.Salvatore (tra Grancia e Melide), lo scorso 8 giugno, è stato riparato. L'Ufficio federale delle strade (USTRA) ha comunicato oggi, venerdì, che a titolo preventivo sono stati praticati 600 fori di drenaggio su entrambe le canne. In questo modo si vuol fare defluire con maggiore facilità l'eventuale acqua infiltrata dietro i rivestimenti del tunnel.
"È stata avviata un'indagine approfondita delle diverse componenti della galleria – sostiene l'USTRA –. I rilievi verranno effettuati visivamente, con apparecchiature laser e con dei georadar". Così facendo si vogliono individuare eventuali nuove zone da monitorare.
Prima dell'inverno si vuole inoltre migliorare la raccolta dell'acqua per evitare la formazione di ghiaccio nei periodi freddi, nonché per consolidare localmente anche le pareti e la volta della struttura.
MABO
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