“A special structure to accommodate the traction and step-down substation (TSS) has been created underground near the Rizhskaya station on the north-eastern section of the Big Circle Line (BCL) of the Moscow Metro”, said Andrey Bochkarev, Deputy Mayor of Moscow on Urban Planning and Construction.

Mosinzhproekt Group of Companies is a general designer and general contractor to build new lines and stations of the Moscow Metro.

“The construction of the north-eastern BCL section was carried out in cramped conditions, which required custom engineering solutions. The traction and step-down substation, which ensures the operation of the Rizhskaya station systems, is located outside the station, in an underground nine-storey cylindrical structure, which is about 40 metres deep”, said Andrey Bochkarev.

According to him, the TSS is located on the running tunnel between the Rizhskaya and Sokolniki BCL stations. To optimise costs, the cast-in-situ structure was erected in the former assembly and dismantling chamber where the tunnel boring machines, that tunnelled the BCL, started and finished.

“Usually, substation equipment is placed horizontally, on two or three tiers of a metro station. In this case, nine floors are provided to serve the TSS. The technical facility is now being commissioned”, specified the Deputy Mayor.

Yuri Kravtsov, General Director of Mosinzhproekt JSC, recalled that the Rizhskaya station was built at a depth of more than 60 metres next to the Rizhsky railway station and tracks of the Rizhsky suburban railway line as well as the Kaluzhsko-Rizhskaya station of the Kaluzhsko-Rizhskaya Line, which would be used as an interchange from the BCL.

“Creating a separate facility for the traction and step-down substation instead of building a room inside the new BCL station made it possible to compactly locate the station complex in the dense location of operating transport facilities and, in particular, to ensure an uninterrupted operation of the railway and metro”, specified Yuri Kravtsov.

In addition to Rizhskaya, the north-eastern section of the Big Circle Line of the Moscow Metro includes new stations Sokolniki and Maryina Roshcha, as well as the already commissioned Aviamotornaya, Lefortovo, Elektrozavodskaya stations, temporarily operating as part of the Nekrasovskaya Line, and the connecting line to the Nizhegorodskoye electric depot.

Construction of the Big Circle Line is the main project of the Moscow Metro construction. Its length will exceed 70 km, and it will accommodate 31 stations, 22 of which are already open to passengers.

Today, Sergei Sobyanin, Mayor of Moscow, has had a technical launch of the north-eastern section of the Big Circle Line (BCL) of the Moscow Metro.

“The construction of the Big Circle Line has entered its final stage. Today, we are launching the north-eastern section. This is a trial run. This is one of the most challenging sections in the history of metro construction. In the near future, before the end of the year, we will have technical launches of the eastern and southern sections. We will have to prepare nine metro stations and 11 running tunnels for launching. In addition, the two largest electric depots should to be completed and launched to operate the entire BCL complex,” said Sergei Sobyanin.