DELHI (Metro Rail News): At Krishna Park Extension Station, the HCC – VCCL JV’s tunnel boring machine S86 accomplished the first breakthrough of the 65.10 km Delhi Metro Phase 4 project for a 2.03 km underground extension of the 38.235 km Magenta Line (Line-8).
TBM Triveni, a 73-meter-long, 6.52-meter-diameter Terratec Earth Pressure Balance (EPB) machine, began tunnelling in January 2021 from Vikaspuri Park Shaft, a distance of 1.4 kilometres, to construct the down-line tunnel.
The Delhi Metro Rail Corporation (DMRC) awarded HCC – VCCL the contract for building package DC-06 of the 65.10 km Delhi Metro Phase 4 project in January 2020, with a contract value of Rs. 489 crore and a 36-month deadline.
Their job entails constructing twin tunnels from the Vikaspuri Park Shaft north of Janakpuri West Station to the Vikaspuri Ramp near Keshopur Station, with one underground station at Krishna Park Extension (co-incidentally built by HCC in a joint venture with Samsung for Phase 3’s Package CC-34 north of Janakpuri West Station).
The equipment will now be dismantled, transported, and reassembled at Vikaspuri Shaft to construct the parallel 1.4 km up-line tunnel.
Triveni will be the only TBM operating in Delhi until mid-2022. STEC’s TBMs will begin tunnelling between New Ashok Nagar Down Ramp – Anand Vihar – Sahibabad UP Ramp for the Delhi – Meerut RRTS’ Package 4 later in 2022. If awarded, Afcons and Tata’s TBMs should be in service for Magenta Line’s DC-05 and Silver Line’s DC-07, DC-08, and DC-09 in 2023.