The Tata – Gülermak JV yesterday commissioned TBM S53 – their second Tunnel Boring Machine from the Bapu Bhawan Shaft, located adjacent to the Sachivalaya (State Secretariat) Station’s site, for building the up-line tunnel of the 22.878 km north-south line’s 3.44 km underground section.
Parts of this Terratec Earth Pressure Balance (EPB) TBM, nicknamed Ganga after the Ganga River, were lowered into the shaft in January-February. The TBM is currently building temporary rings within the shaft and will first travel northwards on a 780 meter journey towards the Hazratganj Station – see tunneling plan.
TBM assembly images:
Meanwhile, TBM S52 (Gomti) has excavated and built 56 rings (1 ring=1.4m) out of an estimated 578 rings since it was commissioned on January 23 2017. In the above image, soil/muck can be seen being brought out from the tunnel.
Here’s a brilliant video of the Bapu Bhawan Shaft shot yesterday. In the top-left corner, the temporary rings built by TBM S52 are visible. Towards the right is the Sachivalaya (Secretariat) Station’s site.
And here’s a look at the under construction Charbagh Ramp, connecting package LKCC-01 with LKCC-06, through which trains in 2019 will enter and exit the tunnels:
For more updates, check out the Lucknow section of The Metro Rail Guy!