L&T’s Delhi Metro TBM-2 Records Breakthrough at Chhatarpur Mandir

Larsen & Toubro (L&T) today celebrated tunnel boring machine (TBM) DZ1123’s breakthrough at Chhatarpur Mandir Station of Delhi Metro’s 23.622 km Golden Line (Line-10) which will connect Aerocity – Tughalakabad via 15 stations.

This was TBM-2 (DZ1123)’s second breakthrough and overall the fourth breakthrough for Delhi Metro Phase 4 project’s 6.51 km Package DC-09 connecting Kishangarh – Saket G Block.

DZ1123 is a CRCHI Earth Pressure Balance (EPB) machine, and had previously built a 1274m tunnel from Chattarpur Station to Kishangarh Station in 8 months for its first assignment which ended in December 2023.

The machine was then brought back to Chattarpur Station’s eastern-end and re-commissioned in February 2024 towards Chhatarpur Mandir Station – covering a distance of 859 meters over the past 8 months.

DZ1123 built 613 rings (1 ring = 1.4m) at an average depth of 15m. Notably the machine passed under the Yellow Line’s viaduct just south of the existing Chattarpur Station (view satellite imagery on Google Maps).

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.

DZ1123 is one of L&T’s four TBMs working on Package DC-09 between Kishangarh – Saket Ramp.

This was the fourth of 10 breakthroughs planned in Package DC-09. L&T’s TBM-1 (DZ1122) had completed building the parallel tunnel in August (seen above on the left), and I hear it’s currently getting assembled for its relaunch from NEB Sarai Station to the Ramp area.

L&T’s other 2 TBMs (DZ1124 and DZ1125) are currently tunneling from Chhatarpur Mandir Station to IGNOU Station. I’ll add their progress data here when available.

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– TMRG