The Delhi Metro Rail Corporation (DMRC) achieved a major construction milestone in Phase 4 with the completion of an underground tunnel between Chhatarpur Mandir and IGNOU Station on the Tughlakabad – Aerocity corridor.
The breakthrough of the Tunnel Boring Machine (TBM) at the IGNOU Station site of the Delhi Metro took place in the presence of Shri Anand Mohan Bajaj, Deputy Comptroller & Auditor General, Commercial, Shri Pramod Kumar, Additional Deputy Comptroller & Auditor General, Dr. Vikas Kumar, MD, DMRC, and other senior officials.
This new tunnel has been constructed at an average depth of approximately 26.0 meters (min depth 15.0 mtr & max. 36) making it one of Delhi Metro’s deepest tunnels.
The tunnel on the Magenta Line at Hauz Khas has been built at a depth of about 30 metres. About 1048 rings have been installed in the tunnel, with an inner diameter of 5.8 meters.
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.
