CBE Group has been awarded the supply of segment moulds for the lining of the Anacostia River Tunnel project in Washington DC and the new part of the subway in Rennes, France. Six sets of moulds will be delivered to Bay State Precast LLC for the 3.84km long Anacostia River Tunnel project in Washington DC, and five sets of moulds will be supplied to the Rennes Line B project for use on a 7.5km long tunnel section. Each ring is composed of five standard and two key segments with an exterior diameter of 7620mm a thickness of 305mm and a width of 1829mm. The segments will be manufactured in the Bay State Precast LLC factory located at Brandywine, near Washington DC. The CBE carrousel which will accommodate these new moulds, had already been used successfully for the production of the Blue Plains tunnel segments, including the anchored gasket technology.
And once again, Bay State Precast has chosen the anchored gasket option for the Anacostia moulds. Before casting, the gaskets are directly installed inside the segment mould, instead of using a long gasket gluing procedure.
Both tunnels, Anacostia and Blue Plains are part of the Long Term Control Plan of the District of Colombia Water and Sewer Authority (DC Water) in order to make the rivers, Potomac and Anacostia River, of the city cleaner. The construction contract had been awarded to the Impreglio/Healy/Parsons JV in 2013, the tunnel is planned to be finished in March 2018.
CBE’s scope of supply to the construction of the new subway line B of Rennes in Brittany, France comprises five sets of segment moulds with an exterior diameter of 9100 mm, a width of 1300 mm and 2000 mm and a thickness of 400 mm. The concrete rings will have a configuration of four standard, two counter-key and one key-stone and will line the 7,5 km long tunnel part of the metro. Additionally, CBE will design and install a carrousel precast factory near the tunnel shaft entry at Bruz in order to produce nine concrete rings per day. The TBM is supposed to start tunnelling in November 2014. CBE Group already delivered moulds and precast facilities to the construction of the first subway line in Rennes back in 1997.