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Construction of second interstation tunnel for new metro line starts in St. Petersburg


The Krasnoselsko-Kaliniskaya will be the sixth line of the St. Petersburg metro.

Merostroy has started boring the second interstation tunnel for the Krasnoselsko-Kaliniskaya metro line in St. Petersburg. This will be the sixth line of the St. Petersburg metro connecting the city’s southwest part with the northeast quarters. Saint-Petersburg TV Channel reporter Kirill Radion got underground to see the construction progress. 

The tunnel boring machine moving forward centimeter by centimeter 65 meters underground is a veteran unit. It is almost 30 meters long and over 5.5 meters in diameter.

Andrey Korelkov, head of the Metrostroy assembly division, explains: ‘The rock and soil is excavated by the transporter, loaded into wagons and carried to the shaft. The tunneler installs blocks into the soil, and then they are fixed with cement.’

The most difficult thing in underground construction is getting through water-bearing soils, sandstone and large rocks also present difficulties. Other soil types are less hard to bore.

Kirill Radion shows: ‘This is Cambrian clay. The tunneling machine can bore up to 9 meters of tunnel a day in it.’

At present, the tunnel boring machine is moving towards the Narvskaya metro station making a tunnel to the depot. The tunnel for passenger trains between the stations was completed about two months ago.

Yekaterina Giginyak, press officer of Metrostroy, tells: ‘The construction of the inclined tunnel of the Kazakovskaya station is being completed now. It is an important stage of the project.’

The Krasnoselsko-Kaliniskaya metro line will link the southwest part with the northeast quarters of St. Petersburg. It will have transfer stations to change to the ‘red’, ‘purple’, and ‘blue’ lines allowing passengers to get to their destination without travelling across the city center. Two stations of the line, Kazakovskaya and Putilovskaya, are to open in 2023.

Photo and video: St. Petersburg TV channel