In Cagliari, the fight against water network leaks is being fought with "relining", the "no-dig" technique. Instead of physically replacing the old pipes, Abbanoa is installing a special ultra-resistant sheath inside that adheres to the internal walls. The goal: to eliminate any leakage. The ongoing construction site concerns the main backbone of the city's water network that runs from the reservoirs on the San Michele hill to those on Monte Urpinu: a pipe over four kilometers long and 700 millimeters in diameter.
Opening the roads, as explained by Abbanoa, and replacing the pipes with traditional methods would have meant cutting the city in two with a construction site that would have had devastating effects on traffic, because roads with very high traffic levels would have been affected. The times would also have been very long. The intervention in progress, however, will end by December 31 .
The pipeline descends from the San Michele hill along via Monsignor Piovella and passes under via Cadello and then continues along via Mattei, via Liguria, via Bacaredda, via Cocco Ortu, via Petrarca, via Pergolesi, Largo Gennari, via Sanjust and a stretch of viale Europa to go back up to the Monte Urpinu tanks. The only excavations concern the wells where the sheaths are inserted and pulled to the other side. Robots are also in the field. The sheath has been passed in the first stretch along via Monsignor Piovella up to piazza d'Esquivel. The crossing of via Cadello is now underway, but without digging up the road, passing the sheath up to the well built in via Mattei . From here the second stretch will subsequently begin up to the Monte Urpinu tanks.
Work is underway to build the first wells in the area between Via Salento, Piazza Kennedy and Via Marche. Additional wells will be built along the route: the areas in Via Sant'Alenixedda and Via Cocco Ortu have already been identified. In recent years, the same technique has been successfully used to rehabilitate another primary conduit of the city water network from Piazza Sant'Avendrace to Piazza del Carmine, passing through Viale Sant'Avendrace and Viale Trieste.
The video features an interview with Martina Melas, Abbanoa engineer responsible for the procedure.
(Online Union)
