TBM Makes Breakthrough at Delhi Metro’s Mayapuri Shaft

Yesterday afternoon, the S26 Tunnel Boring Machine operated by the J. Kumar – CRTG – Terratec team for contract CC-20 of Delhi Metro’s Phase 3 project made a breakthrough at the Mayapuri shaft! This Earth Pressure Balance TBM with a diameter of 6.61m was commissioned from the Naraina Vihar station on December 8 2015 and completed the 310m long down-line tunnel at the Mayapuri shaft of the new 58.59 km Pink line which encircles the city.

Satellite view of the Mayapuri shaft adjacent to the busy Ring Road:

Yellow star - Naraina Vihar station ; Purple star - Mayapuri Shaft

Yellow star – Naraina Vihar station ; Purple star – Mayapuri Shaft – view Delhi Metro map

Photo Copyright: Satyendra Singh

Crowd of workers & engineers gathered around the Mayapuri shaft – Photo Copyright: Satyendra Singh


Seconds before the breakthrough, the tunnel’s eye was blasted with a mix of water & foam
– Photo Copyright: Urin Wanbanterng


Boom! – Photo Copyright: Urin Wanbanterng


Desi pride on display – Photo Copyright: Shashi Pratap


And the Thai workers from Terratec brought out their flag as well – Photo Copyright: Prince Garg


A group of visitors at the Mayapuri shaft – Photo Copyright: Basavaraj Chalmi


One of them is the DMRC’s MD Mangu Singh – Photo Copyright: Achlendra Katiyar


February 3 2016 – S26’s final breakthrough at Mayapuri shaft – Photo Copyright: Vaibhav Saxena

To quickly recap, TBM S26 made it first breakthrough at Naraina Vihar station from the Delhi Cantt. shaft on October 5 after which it was dragged across the station’s length (roughly 200m) using hydraulic jacks over a period of roughly 18 days. Many images of the contractor dragging the TBM can be viewed here. The TBM was then commissioned on December 8 for one final drive which it completed in no time! 🙂

News Alert:  TBM S27 which was commissioned on the parallel up-line on January 5 is expected to make a breakthrough at the same shaft later this month. Once that breakthrough is made, the 1103m twin tunnels of CC-20’s 2.2 km section from the Mayapuri ramp to the Delhi Cantonment ramp will be complete.

With this breakthrough out of the way, now only 7 more TBM breakthroughs are left on the Pink line:

Red: Yet to Begin ; Green: In Progress

Contract Contractor Origin Destination Tunnel
CC-04 CEC – CICI Majlis Park shaft Azadpur mid-shaft Up-line & Down-line
CC-20 J Kumar – CRTG Naraina Vihar Mayapuri shaft Up-line
CC-18 Pratibha – FEMC RK Puram shaft Bhikaji Cama Place Up-line & Down-line
CC-24 J Kumar – CRTG Ashram Vinobhapuri Up-line & Down-line

For a more detailed report with progress made on all lines’ tunnels, please see my February 2016 Tunneling Update.

News Alert 2: A breakthrough at the Lal Qila station for the down-line tunnel of the Violet line will be made today! Once that is done, all 4 tunnels in contract CC-07 between Kashmere Gate – Lal Qila – Jama Masjid will be complete. I’ll be sure to post information & images, so do check out the home page of my site later!

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


written by

Global traveler who prefers mass rapid transit

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