In October last year the contractor Metrostav,  using a  Herrenknecht S-799 TBM, with a convertible 9,890 mm diameter multi-mode TBM completed the excavation of the 4150 m Ejpovice northern tunnel tube. This work is a part of the modernisation of the Czech railway line between Rokycany and Pilsen. The machine Viktorie drove over 8.3km of single-track running tunnels, installed 33,000 lining segments and excavated over 630,000m3 of ground. It reached a record daily advance of 38m and a record monthly advance of 704m of the now finished tunnel.

The multi-mode TBM Viktorie built two-thirds of the two single-track tunnels (4150 m) through quartzite shale stone and clay soils in closed EPB mode with screw conveyor muck removal. On the last 1.1 km of each tunnel  the TBM worked in open single-shield mode with belt conveyor removal through hard spilite rock.

Currently cableways, cable manholes and dry fire mains are being installed in the southern tunnel tube. In the neighbouring northern tunnel tube they are installing drainage pipelines, manholes and transverse water collecting pipelines . Once these are finished a 40cm thick concrete slab will be cast on it.

Concreting of the tunnel portal on the Rokycany side has been finished and the disassembly of the last parts of the Viktorie TBM were finished by the end of February. Click here for tunnelbuilder archive. Visit https://www.metrostav.cz and https://www.herrenknecht.com.17/18.

https://www.herrenknecht.com/en/media/press-information/2018/maschinen-allrounder-modernisiert-tschechische-infrastruktur.html