Beginning of tunneling of the ventilation tunnels of the left branch of the depot "Likhobory" with the help of the tunnel-boring complex of the Japanese firm "IHI Corporation" with soil loading of 3,6 meters in diameter. Traditionally, the TBM is called the beautiful female name "Agata". It will work in complex hydrogeological conditions, within the boundaries of quicksand and Jurassic clays. It is planned to complete the construction of two tunnels with a total length of 168 meters for three months.
The uniqueness of this penetration lies in the fact that the shield was fed through the shaft into a specially constructed installation chamber 9.5 meters to a depth of 38 meters. After the completing of the construction of the first tunnel, the complex will be rearranged for the first time for the subsequent tunneling of the second tunnel in the 9.5-meter turntables, which is constructed and adjacent to the left branch of the “Likhobory” depot.
Ventilation tunnels are necessary to maintain the maximum permissible concentrations of various harmful impurities (dust and carbon dioxide), as well as the prescribed temperature and humidity levels for the operation of this metro facility.