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NSOOS Tunnel Rehabilitation

This project involved the internal rehabilitation of 5 tunnels in the Northern Sydney Ocean outfall Submain (NSOOS). The objective of this project was to restore the structural integrity and operational performance of the existing system which would ensure a high standard of services to our client’s customers. Some sections of these tunnels were constructed in the 1930’s and 1950’s with others completed in the 1970’s. Until now the majority of these tunnel sections have remained unlined. The rehabilitation process included the removal of silt and debris from the tunnels, localised patch repair work, shotcrete lining of large sections of the tunnels as well as the internal repair and sealing of existing manholes. Much of the works were conducted within sensitive community and environmental locations. Difficult access and sensitive location were a challenge including one construction site located on the shores of Avalon beach.
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