Tunneling works are slowly coming to a wrap! 😀
Yesterday afternoon, Tunnel Boring Machine S723 made a breakthrough for the down-line tunnel at Delhi Metro’s Nehru Enclave station! This EPBM TBM was commissioned on October 30 2015 by the Pratibha-FEMC JV (contract cc-23) from the Greater Kailash station, and completed building 778 rings (1089m) for the 38.235 km Magenta line of the Phase 3 project. This breakthrough comes just a couple months after the 1st breakthrough here was made by TBM S937 for the up-line tunnel.
The TBM actually reached the station’s diaphragm or “D” wall on May 8 and prior to the breakthrough, the crew deployed a drilling machine to assist with tearing it down. This should have taken a max of 3 days to accomplish, but the machine broke down and had to be hoisted back up & replaced with another one.
Satellite view of Nehru Enclave’s receiving shaft which is now covered up:
Fun Fact: This TBM was used by the Pratibha-CRFG JV for excavating and building CC-01’s tunnels between Central Secretariat – Janpath – Mandi House for the Violet Line’s northern extension. That 3.3 km section opened for commercial operations on 26 June 2014.
With this breakthrough out the way, now only 4 more breakthroughs are left to be made on the Magenta Line:
|CC-23||Pratibha – FEMC||Chirag Delhi||Greater Kailash||Down-line|
|CC-27||L&T – SUCG||Shankar Vihar||Aravali Mid-Shaft||Down-line|
|CC-27||L&T – SUCG||Vasant Vihar||RK Puram Mid-Shaft||Up-line|
|CC-27||L&T – SUCG||Vasant Vihar||Munirka||Down-line|
The TBM tunneling between Chirag Delhi & Greater Kailash has just another 35 rings (49m) to go and should reach the GK station’s diaphragm wall in another week’s time.
For more updates, check out the Delhi section of The Metro Rail Guy!