Tunneling work completed on this line of Delhi Metro Phase-4, metro services will start soon

New Delhi. DMRC has achieved another major achievement in the construction works of Phase-4. The tunneling work between Krishna Park Extension and Keshopur on the Janakpuri West-RK Ashram Marg corridor on the Magenta Line of the Delhi Metro has been completed.

Tunnel Boring Machine (TBM) in the presence of Secretary, Ministry of Housing and Urban Affairs, Government of India and Chairman, DMRC Manoj Joshi, Managing Director, DMRC, Vikas Kumar and other senior officials after completing the excavation of 1.4 kilometer long tunnel at Krishna Park Extension this morning. ) came out.

This tunnel was successfully constructed using 73 meter long giant TBM. Two parallel circular tunnels have now been constructed to go up and down on this section which is part of the 2.2 kilometer long underground section from Janakpuri West to Keshopur. The work on the second parallel tunnel on this section was completed in December last year.

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The completion of this section is a significant achievement for the DMRC as it faced repeated disruptions in functioning due to the COVID-19 pandemic. The workforce was maintained following all the guidelines and the construction works were planned accordingly. Apart from two tunnels on this underground section, the work of ramp and entry/exit has been completed and about 70 percent work of Krishna Park Extension station has also been completed. The civil work of this particular underground section will be completed by early next year, however, the entire Janakpuri West-RK Ashram Marg corridor will be ready by September 2025.

This new tunnel stretch is an extension of the already operational Magenta Line tunnel, which was constructed earlier for the present operations of the Botanical Garden-Janakpuri West corridor. The tunnel has been constructed to a depth of about 14 to 16 meters. About 2,000 rings have been installed in the tunnel. Its inner diameter is 5.8 m. The alignment of the tunnel is along the Outer Ring Road and below multi-storey built-up structures.

The tunneling work involved several challenges such as relocating sewer lines at a depth of 8 meters using micro tunneling method. In addition, due to the heavy traffic on the Outer Ring Road, a subway was constructed using the box-pushing method without disrupting the traffic flow.

This technique has been used
The tunnel is constructed with the realized technology of EPBM (Earth Pressure Balancing Method) with concrete lining made of precast tunnel rings. The tunnel rings are cast in a fully mechanized casting yard setup at Mundka. These concrete segments were prepared with steam curing system to impart early hardness.

All necessary safety precautions were taken while constructing the tunnel under the constructed structures by monitoring the ground movements with highly sensitive instruments mounted on the surrounding structures. These measures ensured that there was no compromise anywhere. As part of the Phase-IV construction work approved so far, 28.76 km long underground lines will be constructed. The Janakpuri West-RK Ashram Marg corridor will have a total length of 9.41 km underground section.

this is tbm machine
TBM is a machine used for digging tunnels of circular cross section through different types of soil and rock strata. They can be designed to penetrate anything from hard rock to sand. TBMs have revolutionized tunneling around the world as tunnels can now be excavated without disturbing buildings and other surface structures.

TBM is especially useful for underground tunneling work in congested urban areas. DMRC is using TBM for its tunneling works from Phase-I onwards. About 30 TBMs were used in the national capital during the construction of about 50 km long underground section of Phase-III.

Tags: Delhi Metro, delhi metro operations

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