DMRC Completes Longest Tunneling Milestone on Phase-4’s Golden Line
The tunnel has been built using the proven technology of EPBM (Earth Pressure Balancing Method) with a concrete lining made of precast tunnel rings.
DMRC Completes Longest Tunneling Milestone on Phase-4’s Golden Line
The Delhi Metro Rail Corporation (DMRC), achieved a significant construction milestone in Phase 4 with the completion of the longest underground tunnel between the Tughlakabad Airforce Launching shaft and Maa Anandmayee Marg on the Tughlakabad-Aerocity corridor of Phase-IV.
The breakthrough of the Tunnel Boring Machine (TBM) AMRIT at the Anandmayee Marg site of the Delhi Metro took place in the presence of Sh. Rajiv Dhankher, Director Projects and Planning, DMRC, and other senior officials This tunnel breakthrough was achieved using a mammoth 105-metre-long TBM.
Two parallel circular tunnels for up and down movement are being constructed on this stretch as part of the Aerocity–Tughlakabad corridor. The breakthrough on the other parallel tunnel is expected to be achieved in January 2025. The Civil contractor that has implemented this project is M/s Afcons.
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This new tunnel has been constructed at an average depth of approximately 16 meters. About 1894 rings have been installed in the tunnel, with an inner diameter of 5.8 meters. The tunneling work posed significant technical challenges, including the relocation of a sewer line, navigation through hard rock strata, etc.
The tunnel has been built using the proven technology of EPBM (Earth Pressure Balancing Method) with a concrete lining made of precast tunnel rings. These tunnel rings were cast at a fully mechanized casting yard set up at Mundka.
The concrete segments were cured with a steam curing system to achieve early strength. As part of the Phase 4 work approved so far, 40.109 kilometers of underground lines are being constructed. The Aerocity-Tughlakabad corridor has underground sections totaling 19.343 kilometers.
Read Also : Goa Shipyard Limited (GSL) has a vacancy for the position of Director (Finance)A TBM is a machine used to excavate tunnels with a circular cross-section through various soil and rock strata. They can be designed to bore through anything from hard rock to sand.
TBMs have revolutionized tunneling work worldwide, enabling tunnels to be bored without disturbing buildings and other surface structures.
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