Metros Tenders

HCC Records Delhi Metro Phase 4’s 1st TBM Breakthrough


HCC – VCCL JV’s tunnel boring machine S86 today made the first breakthrough of the 65.10 km Delhi Metro Phase 4 project at Krishna Park Extension Station for a 2.03 km underground extension of the 38.235 km Magenta Line (Line-8).

Nicknamed TBM Triveni, this 73 meter long 6.52m diameter refurbished Terratec Earth Pressure Balance (EPB) machine had started tunneling in January 2021 from Vikaspuri Park Shaft, a distance of 1.4 km to build the down-line tunnel.

HCC – VCCL is responsible for building package DC-06 of the 65.10 km Delhi Metro Phase 4 project which was awarded by the Delhi Metro Rail Corporation (DMRC) with a contract value of Rs. 489 crore in January 2020 and deadline of 36 months.

Their scope of work involves building this section’s twin tunnels from the Vikaspuri Park Shaft (co-incidentally built by HCC in a JV with Samsung for Phase 3’s Package CC-34 north of Janakpuri West Station) to the Vikaspuri Ramp near Keshopur Station, with one underground station at Krishna Park Extension.

Magenta Line’s Vikaspuri Park Shaft – Vikaspuri Ramp underground section – view Phase 4 info & map

The machine will now be dismantled, transported and reassembled at Vikaspuri Shaft for building the parallel approx. 1.4 km up-line tunnel.

Until mid-2022, Triveni will be the only TBM to operate within Delhi. Later in 2022, STEC’s TBMs will begin tunneling for Delhi – Meerut RRTS’ Package 4 between New Ashok Nagar Down Ramp – Anand Vihar – Sahibabad UP Ramp. In 2023, if awarded, we should see Afcons and Tata’s TBMs in action for Magenta Line’s DC-05 and Silver Line’s DC-07, DC-08 and DC-09.

For more updates, check out the Delhi Metro section or my Home Page!



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