TBM Makes Breakthrough at Delhi Metro’s Nehru Enclave

Last night, Tunnel Boring Machine S937 made a breakthrough at Delhi Metro’s Nehru Enclave station! Unlike other breakthroughs, a drilling machine was deployed to assist with tearing down the diaphragm “D-wall” of the shaft. The S937 Earth Pressure Balance TBM was commissioned by the Pratibha-FEMC JV (CC-23) from the Greater Kailash station on July 18 2015 and actually reached the Nehru Enclave’s TBM retrieval shaft a week ago on February 16. On its way, it built 782 rings (1095m) for the 38.235 km Magenta line’s up-line tunnel of the Phase 3 project.

Satellite view of Nehru Enclave’s receiving shaft:

Alignment of Greater Kailash - Nehru Enclave section - view full Delhi Metro map

Alignment of Greater Kailash – Nehru Enclave section – view Delhi Metro map


Photo Copyight: Rahul Ranjan

A government school with precarious foundations is located to the west of the shaft, so a drilling machine was deployed to slowly drill and cut through the D-wall along the eye of the tunnel.


Photo Copyight: Rahul Ranjan


Tuesday morning view – Photo Copyight: Rahul Ranjan

Photo Copyright: SN Ahmed

Photo Copyright: SN Ahmed

Drilling debris to scoop up and out - Photo Copyright: SN Ahmed

Drilling debris to scoop up and out – Photo Copyright: SN Ahmed

More images will be added here once they become available, so do come back!

As of last night, the S723 TBM which is working on the parallel down-line tunnel has completed 347/780 rings and is expected to make a breakthrough by the end of April. Fun Fact: S723 was used by the Pratibha-CRFG JV for excavating and building CC-01’s tunnels between Central Secretariat – Janpath – Mandi House! That 3.3 km section opened for commercial operations on 26 June 2014.

With this breakthrough out the way, now 8 more breakthroughs are left to be made on the Magenta line. The next one will soon take place at the Panchsheel Park station by a TBM deployed from Chirag Delhi for the down-line tunnel.

For more updates on the Delhi Metro’s Phase 3, check out the Delhi section of The Metro Rail Guy!


Share this post!
Share on FacebookTweet about this on TwitterDigg thisShare on LinkedInPin on PinterestShare on RedditShare on Google+Share on StumbleUponShare on TumblrEmail this to someonePrint this page

written by

Global traveler who prefers mass rapid transit

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply

Your email address will not be published. Required fields are marked *