The city has built almost 21 kilometres of metro tunnels since early 2016, Andrei Bochkaryov, Head of the City Department of Construction, noted. Eight of 29 tunnel-boring machines are currently grinding their way through the earth.
Six of them are operating between the Ramenki and Rasskazovka stations on the metro’s Kalininsko-Solntsevskaya Line, and two more are displacing earth between the Elektrozavodskaya and Aviamotornaya stations on the northeastern section of the Third Interchange Circuit (TIC).
As a rule, we use standard six-metre tunnel-boring machines, Mr Bochkaryov explained. But a tunnel-boring machine with a diameter of ten metres is currently being assembled between the Kosino and Yugo-Vostochnaya stations on the Kozhukhovskaya Line. This 66-metre long machine will build two-track tunnels between the Kosino and Nizhegorodskaya Street stations.
The Moscow Metro has used mainly parallel single-track tunnels. The new Third Interchange Circuit line will introduce the double-track tunnel concept. These sections will feature side platform stations. This technology will cut construction costs by up to 30 percent.