Excavation for the last level (#6) of the Delhi Metro Rail Corporation’s best kept secret has started at the Gurdwara Shaft in north Delhi’s Rameshwar Nagar. This emergency shaft was created so that the cutterhead and shields of 4 Tunnel Boring Machines (2 original & 2 rescue) could be lifted out to mark an end to tunneling works for package CC-04 (Mukundpur – Shalimar Bagh) of the 58.596 km Pink Line which is located at the mouth of the Mukundpur Depot.
The CEC-CICI JV commissioned both rescue TBMs S495 & S496 in April 2016 and started excavation works for the mid/emergency shaft in June 2016. If this shaft/development is new to you, then I’d suggest clicking on the links above to catch-up on what went wrong during tunneling and why this shaft is important for commercial operations to begin.
Via a source in the DMRC that would like to remain anonymous, here’s the shaft’s design and images from the commencement of excavation for Level #6. I’ve added level numbers and the depth of the base slab.
All 4 TBMs’ gantry systems have been removed from their rear-end and taken out from either the Azadpur TBM shaft or the Majlis Park Ramp. Here’s the sequence of how the TBMs’ cutterheads & shields will be removed from the Gurdwara Shaft:
- TBM#2 (S781)
- TBM#4 (S495)
- TBM#3 (S496)
- TBM#1 (S780)
As and when they’re removed, I’ll either post here or share updates via my Twitter handle.
For more updates, check out Delhi section of The Metro Rail Guy!