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Si è svolta sabato 5 ottobre sul cantiere della diga del Lago d'Isola a San Bernardino (GR) la giornata delle porte aperte organizzata dalle Officine Idroelettriche di Mesolcina. Dalle 09.00 alle 13.30 grandi e piccini hanno potuto entrare nel ventre dello sbarramento idroelettrico che, in queste settimane, viene sottoposto a importanti lavori di manutenzione.
Lo sbarramento artificiale del Lago dell'Isola presenta alcune deformazioni sul versante a monte che vanno rimosse.
La diga Isola è stata posta in esercizio nel 1962. Dall'inizio degli anni '70 il muro di calcestruzzo sta subendo delle deformazioni sul versante a monte. La ragione è riconducibile alla presenza di fonti di solfato. Le tensioni causate da questo fenomeno provocano la formazione di crepe e un crescente carico sulla diga stessa.
A seguito di ciò lo sbarramento artificiale sarà alleggerito dalle tensioni con un taglio che sarà eseguito sul muro attraverso un filo diamantato. I lavori si svolgeranno durante l'inverno, grazie alla scarsità degli afflussi. Nel periodo dell'intervento l'attività della centrale idroelettrica non risulterà interrotta.
Visita pre-restauro alla diga del Lago d'Isola
Il Quotidiano 05.10.2019, 21:00
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