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Turkmenistan, Ashgabat - tm/12


3.7 m-diameter Herrenknecht EPB, machine No. M-715 with VMT semi-automatic guidance system, screw conveyor, and articulated shield supplied for 2 x 3.5 km-long project. M-715 is already in Ashgabat since early July 2002. On-site assembly in August-September 2002 for tunnelling start in October 2002. Lining rings consisting of five segments plus key. Geology is mainly stiff to hard loam (clay, silt, sand) with ballast in the south part of the city. Groundwater table varies from 1 m below the surface (northern part) to 5 m below the surface. Maximum coverage of 13 m, maximum pressure of 1 bar. First bore expected to break through in about one year. Planning and design of second drive not ready yet. Construction company is Construction Association Interbudmontazh (CAI) of Ukraine. Client is the municipality of Ashgabat. Visit www.herrenknecht.com and www.vmt-gmbh.de 32/02.