L&T’s Delhi Metro TBM-1 Records Breakthrough at IGNOU Station

Larsen & Toubro (L&T) in January-end celebrated tunnel boring machine (TBM) DZ1122’s breakthrough at IGNOU Metro Station of Delhi Metro’s 23.622 km Golden Line (Line-10) which will connect Aerocity – Tughalakabad via 15 stations.

This was TBM-01 (DZ1122)’s third and final breakthrough, and overall the ninth tunnel breakthrough for Delhi Metro Phase 4 project’s 6.51 km Package DC-09 connecting Kishangarh – Saket G Block. With this development, only one more breakthrough is now pending on this package.

DZ1122 is a CRCHI Earth Pressure Balance machine. For its final assignment, TBM-01 built a roughly 1.7 km tunnel for the up-line from City Forest Ramp (Hauz Rani) to IGNOU Station during which it recorded a hidden breakthrough and passed through Neb Sarai Station’s 130m box.

Prior to this, DZ1122 built a 1267m tunnel from Chattarpur Station to Kishangarh Station in 2023, and then a 865m tunnel from Chattarpur Station’s eastern-end to Chhatarpur Mandir Station in 2024.

Delhi Metro Rail Corporation (DMRC) had awarded L&T with Package DC-09’s Rs. 1428 crore contract in March 2022 with a 42 month deadline.

Their 6.51 km section, with twin-tunnels in the middle of the Golden Line, will connect Kishangarh Station (chainage 5356.285) with a cut and cover ramp (chainage 11867.000) west of Saket G Block Station. It includes 4 stations at Chhattarpur (interchange with Yellow Line), Chhattarpur Mandir, IGNOU and Neb Sarai.

DZ1122 is one of L&T’s four TBMs working on Package DC-09 between Kishangarh – Saket Ramp. The others are DZ1123 (TBM-02), DZ1124 (TBM-03) and DZ1125 (TBM-04).

As shared above, this was 9th of 10 breakthroughs planned in Package DC-09. While TBM-03 and TBM-04 have completed their assignments, TBM-02 is currently building the parallel downline tunnel from City Forest Ramp to IGNOU and is expected to record this package’s final breakthrough within the next 2 weeks.

Overall a total of 17 tunnel breakthroughs have been recorded so far for the Golden Line. From east to west: 6/8 by Afcons for Package DC-07, 9/10 by L&T for Package DC-09, and 2/6 by J Kumar on Package DC-08. A full list of breakthroughs including contractors for all Golden Line civil & system packages can be viewed here.

For more updates, check out the Delhi Metro section or my Home Page! Sign up for free instant email notifications on new posts over here. Like this post? Get early-access to all updates and support the site over here.

– TMRG