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Salini Impregilo Group completes Anacostia River Tunnel Excavation in Washington D.C.

The Lane Construction Corp, a U.S. subsidiary of the Salini Impregilo Group, together with its own subsidiary S.A. Healy Co, and Parsons (IHP JV) have completed the excavation of the 12,500 ft. (3.8-kilometre) long Anacostia River Tunnel (ART) in Washington D.C., part of the U.S. capital city’s Clean Rivers Project aimed at reducing the pollution of its rivers.

The Clean Rivers Project, overseen by the District of Columbia Water and Sewer Authority, involves building a system of tunnels, sewers and other diversion structures to capture and treat sewage water. It aims to reduce pollution from combined sewer overflows to the city’s nearby rivers like the Anacostia and the Potomac.

The tunnel was designed with an inside diameter of 23 feet (7 metres). It was excavated using a Tunnel Boring Machine (TBM) with Earth Pressure Balance (EPB) technology. The tunnel runs south from a site near RFK Stadium to the Poplar Point Pumping Station. Its alignment is approximately 100 feet (30 metres) below the surface and runs underneath the Anacostia River, CSX railroad tracks, the new Interstate 695, and the WMATA Green Line.

The ART completion date is December 13, 2017. The JV will complete the project by constructing six shafts of varying sizes, four diversion structures, and three connecting adits of varying length.

The tunnel is the latest major work to be completed in the United States by the Salini Impregilo Group, confirming its commitment to environmentally sustainable public works. Previous projects include the extension of a metro line in San Francisco as well as the hydraulic tunnel under Lake Mead to guarantee the supply of water to Las Vegas and the surrounding area.

The Lane Construction Corp

Following the merger with Salini Impregilo Group in 2016, The Lane Construction Corp, one of America’s leading heavy civil construction companies, became a wholly owned subsidiary of Salini Impregilo U.S. Holdings Inc. S.A. Healy Co has become a wholly owned subsidiary of Lane. It is a leading U.S. tunnel and heavy construction contractor. Since its founding in 1923, S.A. Healy has tunneled over 100 miles and completed more than 200 projects worth billions of dollars, including the award-winning Intake 3 project at Lake Mead to guarantee the supply of water to Las Vegas.

Source: Salinig Impregilo

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