DMRC begins underground construction work for Delhi Metro Phase 4

New Delhi, India (Urban Transport News): On October 16, 2020, the JV HCC – VCCL team started to reduce the works of the very first tunnel boring machine (TBM) of the phase 4 of the Delhi metro to Vikaspuri on the Janakpuri West – RK Ashram Marg corridor. As part of this tunneling, two tunnels (for up and down movements) with a length of 1.4 kilometers will be drilled between Vikaspuri and Krishna Park Extension.

Tunneling work with the TBM S-86 is expected to begin next month after the completion of the descent and assembly of the giant 73-meter-long machine. These tunnels will be located between Janakpuri West and Krishna Park Corridor Extension stations. The tunneling will start in the Vikaspuri region as an extension of the Magenta Line tunnel which has already been built for the currently operational Botanical Garden – Janakpuri West corridor.

The tunnel will be constructed approximately at a depth of 14 to 16 meters. Approximately 2,040 concrete rings will be installed in these tunnels. Each tunnel will have an internal diameter of 5.8 meters. All the tunneling work on this section should be completed in about 15 months. The alignment of the tunnel will be along the outer ring road.

As part of the Phase 4 works approved so far, approximately 27 km of underground lines will be constructed. The Janakpuri West – RK Ashram Marg corridor will have underground sections of 7.74 kilometers in total.

In January 2020, DMRC awarded a contract worth Rs 489 crore to the consortium of HCC – VCCL for the construction of twin tunnels from Vikaspuri Park Shaft to Vikaspuri Ramp, with an underground station at Krishna Park Extension as part of the contract. Delhi Metro Phase 4 DC-06. Work is expected to be completed in 36 months.

A tunnel boring machine is a machine used to dig tunnels with a circular cross section through a variety of soil and rock strata. They can be designed to drill through anything from hard rock to sand. TBMs have revolutionized the way tunneling work is done around the world, as tunnels can now be drilled without disturbing buildings and other structures above ground.

TBMs are particularly useful for underground tunneling work in congested urban areas. DMRC has been using tunnel boring machines for its tunneling work since phase 1. During phase 3, when around 50 kilometers of underground sections were built, around 30 tunnel boring machines were put into operation in the nation’s capital.

For more details, please explore the Delhi Metro urban transport news page.

Bonny J. Streater

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