DMRC completes tunneling between INA & South Extension

The Delhi Metro Rail Corporation (DMRC) has successfully completed the tunneling work between the INA and South Extension Metro stretch by making a Tunnel Boring Machine (TBM) breakthrough at the South Extension station site in the presence of Mr. Mangu Singh, Managing Director, and other senior officials of the organization.

This TBM, which was lowered at the INA shaft in October, 2013, has completed a tunneling drive of 925 meters before being retrieved from the site. The other TBM, which is only 250 meters behind in the adjacent tunnel, is also expected to be retrieved from the South Extension shaft in a fortnight.

This underground stretch forms a part of the 58.467 km long Majlis Park (Mukundpur) – Shiv Vihar corridor of Phase III network. This corridor includes the following underground tunneling stretches:

Underground Stretch
S. No Length
1 Majlis Park (Mukundpur) – Azadpur 1.138 km
2 Azadpur – Shalimar Bagh 1.445 km
3 Shalimar Bagh – Netaji Subhash Place 1,247 mtrs
4 Mayapuri Ramp – Naraina Vihar –Delhi Cantt. Ramp 1.2 km
5 Bhikaji Cama Place – Sarojini Nagar 1, 105 mtrs
6 Sarojini Nagar – INA 710 mtrs
7 INA – South Extension 925 mtrs
8 South Extension – Lajpat Nagar 1, 565 mtrs
9 Lajpat Nagar – Vinobapuri 835 mtrs
10 Vinobapuri – Ashram 873 mtrs
11 Ashram – Hazrat Nizamuddin 1,654 mtrs
Presently, tunneling is also going on between Sarojini Nagar and INA that covers a stretch of 710 meters. The two TBMs, which were lowered at Sarojini Nagar in March, 2014, are expected to be retrieved at the INA shaft in July, 2015.

TBM drives are also going on between Shalimar Bagh – Netaji Subash Place and between Azadpur – Shalimar Bagh underground stretches of the 58.467 km long Majlis Park – Shiv Vihar corridor of Phase III. Besides this, tunneling drives are also being carried out from Hazrat Nizamuddin – Ashram and Vinabapuri – Lajpat Nagar stretches at present.

The 58.467 km long Majlis Park – Shiv Vihar corridor of Phase III consists of about 14 kms of underground lines. DMRC is slated to construct 53 km of underground Metro lines as part of its Phase III construction work for which about 34TBMs are expected to be used. A total of 74 tunnels will be constructed in this phase.

As regards the progress of civil construction in Phase III, over 30 kms of viaducts and over 15 kms of tunnelling has been completed so far which is as per the schedule of DMRC’s Phase III project execution