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.
![](https://themetrorailguy.com/wp-content/uploads/2020/12/DMRCPackageDC06RouteMap.png)
![](https://themetrorailguy.com/wp-content/uploads/2021/12/HCCDelhiBreakthrough2.jpg)
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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!
– TMRG
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