Underground tunnelling work between INA and South Extension commenced on Thursday with the Delhi Metro Rail Corporation lowering the first Tunnel Boring Machine at INA.
The upcoming stations form part of the Bhikaji Cama Place–Lajpat Nagar underground section of the Mukundpur–Shiv Vihar corridor under Phase-III of constructions. This is the second TBM to be lowered on this 58.467-km long corridor. The first is currently operational between Netaji Subhash Place and Shalimar Bagh.
The initial drive of the TBM after it is fully assembled is expected to start in the first week of November and will cover a distance of 924 metres. This underground stretch between Bhikaji Cama Place and Lajpat Nagar will have a total of eight TBM launchings. It includes two launches from INA to South Ex, two from South Ex to Lajpat Nagar, two from Sarojini Nagar to INA and two more from Bhikaji Cama Place to Sarojini Nagar.
DMRC will place a total of 6,145 precast rings in a total tunnelling drive of 4.299 km between Bhikaji Cama Place and Lajpat Nagar. The tunnel will have an internal diameter of 5.8 meters and width of 1.4 meters.
Under Phase-III of operations, 53 km of underground Metro lines are slated to be constructed for which 34 TBMs may be used.
A total of 74 tunnels will be constructed in this phase. Presently, TBMs are operational on five stretches, three on the Central Secretariat–Kashmere Gate corridor, and one each on the Mukundpur–Shiv Vihar corridor and the Janakpuri West–Botanical Garden stretch.