Surface Connection Challenges
In 2011, NYC’s Department of Design and Construction (DDC) sought to connect a reach of Tunnel No.3 to the city’s distribution system using 4 access shafts. Located in several high profile areas of Manhattan, including Lincoln Center, the Theatre District and Little Italy, the scope of work includes street construction of over 18,000 feet of 48 and 30 inch diameter steel pipeline. Awarded to Waterworks, JV for a contract value of $234.8M, MED 609 is the largest such project ever undertaken by DDC.
Constructing a large-diameter water transmission pipeline in an urban environment such as Manhattan is difficult. Right-of-way within the street is tight with numerous existing utilities. Open trench is limited and shoring requirements strict. Pipeline installation is tightly regulated and must be choreographed around traffic control and other public mandates. With construction this difficult, pipe material selection is critical, and NYC only allows cement mortar lined, polyethylene tape coated steel pipe for diameters of 36 inch and larger.How we solved it →