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https://rde.it/wp-content/uploads/2022/03/RdE-Arabia-Saudita-Al-Hayer.jpg1920730Description Design and construction of 11.9 km of wastewater conveyor tunnels (north and south tunnels) from Manhoufa Sewage Treatment Plant to Al Hair Sewage Treatment Plant using the TBM method. Both tunnels are excavated with a double-shield TBM machine. During excavation, concrete segmental lining was installed, the internal walls are coated with protective PVC or […]