Delhi Metro Silver Line’s TBM DZ1123 Records Breakthrough at Kishangarh

Larsen & Toubro (L&T) on Saturday celebrated tunnel boring machine (TBM) DZ1123’s breakthrough at Kishangarh Station’s cross-over for Delhi Metro’s 23.622 km Silver Line (Line-10) which will connect Aerocity – Tughalakabad via 16 stations.

This was DZ1123’s first breakthrough and overall the 2nd breakhthrough for Delhi Metro Phase 4 project’s 6.51 km Package DC-09 (Kishangarh – Saket G Block) where a total of 4 machines will be deployed by L&T.

Locally known as TBM-2, this CRCHI Earth Pressure Balance machine was commissioned in April 2023 from Chhattarpur Station’s west-end and built a 1274m tunnel for the down-line in 8 months.

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 Silver 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.

This is the second of what I estimate 10 breakthroughs planned in Package DC-09. DZ1123’s sister machine DZ1122 had recorded the entire line’s first breakthrough at the same shaft in November 2023. Here’s a snap of both machines together:

L&T’s 3rd TBM DZ1125 was lowered into Chattarpur Mandir Station’s shaft in November. I haven’t heard of it being commissioned so far.

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– TMRG