The structures, tracks and roads were monitored around the clock for the safety

“The tunnelling of the Lyublinsko-Dmitrovskaya Line from the Seligerskaya station to the Fiztekh station was carried out in difficult conditions, beneath the key transportation facilities in the north of Moscow”, said Andrey Bochkarev, Deputy Mayor of Moscow on Urban Planning and Construction.

Mosinzhproekt Engineering Holding acts as the operator of the Moscow Metro Development Program.

“For the first time in the history of Moscow metro engineering, three tunnel boring machines “Klavdiya”, “Tatiana” and “Irina”, finished in parallel. Now all the stations of the new section of the light green line are connected to one other,” said Andrey Bochkarev.

The head of the construction complex said that the tunneling was complicated by the presence of large transportation facilities in the area. During the work, the structures, tracks and roads were monitored around the clock for safety and security under the infrastructure facilities.

“The tunneling was carried out under key road and transportation facilities in the north of Moscow. All three TBMs passed under the Dmitrovskoye highway, and two of them passed under the protective zone of the Moscow Central Diameter (MCD-1) first route between Mark and Lianozovo platforms,” specified Bochkarev.

Yuri Kravtsov, General Director of Mosinzhproekt JSC, said that the “Tatiana” and “Irina” TBMs which worked between the future Lianozovo and Fiztech stations, crossed the Moscow Automobile Ring Road, and passed beneath Lyotchika Spirina street. Each of the tunnels was over 2.3 km long.

“At the neighbouring Lianozovo station, the “Klavdia” TBM arrived at the same time, which tunnelled two right running tunnels from the headshunts behind the existing Seligerskaya station through the future Yakhromskaya station with a total length of over 2 km under the Dmitrovskoye highway. Earlier, the same TBM had built the left tunnels of these runs, completing the work last summer,” added the head of the holding.

Yuri Kravtsov specified that the tunnels were built in clay soils of semi-hard interlayers of tight plastic and hard loam, as well as with an admixture of sedimentary crushed stone.

Today, Sergei Sobyanin, Mayor of Moscow, participated in the completion ceremony of three tunneling operations on the new section of the light green line of the Moscow Metro. “Tunnelling is fully complete at the three stations. The builders will continue arranging excavation pits and erecting stations”, specified the Mayor of Moscow.

As a reminder, the world record for the largest number of tunnel boring machines (TBMs) working simultaneously on a single project was recorded in 2020 Guinness World Records — 23 machines were involved in Moscow as part of the Moscow Metro Development Program.