The “Sheremetyevskaya” Big Circle Line is being constructed using the shaft method - completely underground. Through the vertical shaft 1238bisK on site 13.1, metro builders are making their way to the ends of the future station. Deputy Head of Section No. 3 of SMU-8 Mikhail Nikolaev spoke about excavation through high-strength rocks.
Metro construction workers are laying underground paths from the shaft to the future platform in high-strength limestone. Therefore, the drilling and blasting method is used. The diameter of both approach adits is 4.39 meters. The right one passes under the distillation tunnels from Maryina Roshcha towards Butyrskaya. Its final length will be 200 meters (197 rings), the left - 110 m (108 rings).
– The advantage of these workings is that they are permanent. They will be handed over to the metro and will be used as cable collectors and connected to the lobby. There will be a traction-step-down substation - the room that is responsible for power supply to the station, - says Nikolaev.
55 rings are already ready in the right and 47 in the left adit. From here the left and right station tunnels will be built. First, shields with a diameter of six meters will transit there. Subsequently, the lining will be dismantled and the tunnels will be expanded to 8.5 meters using a tubing layer.
A vertical shaft with a diameter of six meters was passed back in 2017. Preparatory work began in the spring, and by mid-summer the construction had already been completed. Having passed 80 meters deep into the earth with the VSM-10000 complex, the fifth section of SMU-8 left the facility.
By the end of the year, the foundations of the lifting machine and the building intended for it were prepared, and the site was equipped. That’s when the crews from precinct No. 3 got involved. First of all, they carried out metal insulation of the butt joints between reinforced concrete blocks and reinforcement of the shaft.
In March 2018, construction of the mining yard began. The first 13 half-rings of the lining were installed. Then the slaughtering was stopped and construction of the mining complex began.
For its full operation, it was necessary to establish many mechanisms. We made two storage bunkers, a pile driver, and installed cargo cages. A bunker and material overpass were built. We installed pushers, tippers and a transverse trolley. At the same time, we established the operation of the Czech lifting machine INCO. At the beginning of August last year, the mountain complex was launched.
Afterwards, the construction of the mine yard was completed, which accommodated 53 half-rings in its finished form. At the same time, they made an overrunning adit to the material well, through which sand would be supplied from the surface. They also built a combined drainage chamber, where there will be treatment and pumping facilities. An English ramp was installed, combining two paths from the adits into one. And only then did they begin to excavate future cable collectors.
Meanwhile, from mine No. 946, located nearby, they are building an interchange to the Lyublinsko-Dmitrovskaya line and approaching the level of the central hall of Sheremetyevskaya.