The drilling of the cut piles of the 42-meter dismantling shaft frame above the deep tunnel between the operating Syrets station and the future Mostytskaya has been completed. Currently, our specialists have begun the construction of the shaft mouth - a reinforced concrete belt. We are also starting to drill water-reducing wells in the internal contour of the shaft - for pumping water from water-saturated soils and for monitoring. After that, we will begin to develop the soil. The dismantling shaft is needed to remove the tunnel-passage shield to the surface after the tunneling. Another section has been put into operation - the Mostytskaya station pit. Here, the transfer of communications is underway, and the installation of a reinforced concrete belt on the wall in the soil is underway - these are reinforced concrete beams concreted on top of the walls of the pit. The strapping beam distributes the load from the soil to the entire wall. This is necessary so that the excavation is strong and safe for work. We will soon continue to install a wall in the ground, which was partially erected by the previous contractor.
Two-tier monolithic tunnels between the stations “Mostytska” and “Prospekt Pravdy”: they are being built in an open way - in the excavation, without the use of a tunnel-passage shield. In these tunnels, metro trains will move one above the other, but they will arrive at the station traditionally - in one plane. Currently, concreting of the walls and tunnel overlaps continues here. We are working with grabs - we are not concreting the entire tunnel at once, but in sections of up to 20 meters, which allows us to perform work faster and more efficiently. In parallel, we continue to develop the excavation for further construction of tunnels.
The station “Prospekt Pravdy” will be the final stop of the “green” branch. It also provides for reversible dead ends with a viewing ditch, service premises and a service platform. In the roundabouts, metro trains will change direction and will stand still at night. In this area, soil stabilization in the excavation using Jet grouting technology is underway. This method of strengthening the foundation is actively used to create underground tunnels, in particular, the metro. Thanks to jet grouting, it is possible to build reliable structures in waterlogged soils. In parallel, we are arranging a system for fastening the excavation and transferring engineering networks.