Top-down technology used for Zamoskvoretskaya Line’s Belomorskaya Ulitsa metro station

Top-down technology used for Zamoskvoretskaya Line’s Belomorskaya Ulitsa metro station
This is the first use of this method in the Moscow Metro.

The Zamoskvoretskaya Line’s Belomorskaya Ulitsa metro station is being built with top-down construction technology. This is the first time the Moscow Metro has used this method, Deputy Mayor for Urban Development and Construction, Marat Khusnullin said.

“The technology prevents builders from inconveniencing local residents as they press through soil and form an excavation pit. The construction site borders a residential development,” he said.

According to Stroicomplex head, top-down technology is used in Spain to build 20-30 metre deep sub-surface stations. The Belomorskaya Ulitsa metro station will be 25 metres deep.

Top-down technology starts with the installation of temporary substructures or retaining walls in the ground to support a surface deck to avoid interfering with traffic or other surface activity. A roof slab is poured below the surface deck between the retaining walls. Openings are left in the surface deck to excavation further down. The slab on the next level down is poured as the soil is removed. Permanent side walls are then poured in between the slabs. The temporary retaining walls that supported the slabs will be removed, once the bearing walls or permanent columns have been built.

The Belomorskaya Ulitsa metro station will be located between the Zamoskvoretskaya Line’s Khovrino and Rechnoi Vokzal metro stations. The construction was due to start in 2018 and to be completed in 2020. The station will be located at the Belomorskaya and Smolnaya streets intersection.