Delhi Metro completes first tunnelling of phase-III project



New Delhi: Delhi Metro on Thursday completed construction of the first tunnel of its Phase-III project at the upcoming Janpath Metro station which is part of a corridor expected to ease the rush on Rajiv Chowk station.

The Tunnel Boring Machine (TBM) emerged at Janpath metro station site after making a 909.3 metre-long tunnel from Chelmsford Club on the Down Line.

"This TBM was lowered in the Chelmsford Club shaft on January 31 and after assembly of the TBM below the ground. The TBM broke through from the South Shaft of the Janpath Metro station close to the Chandralok building. The initial drive began on March 4," Delhi Metro spokesman Anuj Dayal said.

The tunnelling was done almost 18 metres below the earth's surface and the excavated earth was deposited at the Sarita Vihar Depot and forest land.

New Delhi: Delhi Metro on Thursday completed construction of the first tunnel of its Phase-III project at the upcoming Janpath Metro station which is part of a corridor expected to ease the rush on Rajiv Chowk station.

The Tunnel Boring Machine (TBM) emerged at Janpath metro station site after making a 909.3 metre-long tunnel from Chelmsford Club on the Down Line.

"This TBM was lowered in the Chelmsford Club shaft on January 31 and after assembly of the TBM below the ground. The TBM broke through from the South Shaft of the Janpath Metro station close to the Chandralok building. The initial drive began on March 4," Delhi Metro spokesman Anuj Dayal said.

The tunnelling was done almost 18 metres below the earth's surface and the excavated earth was deposited at the Sarita Vihar Depot and forest land.

A total of 648 rings have been inserted simultaneously along with the tunnelling process. Each ring has five segments (each 275 mm thick) and the length of one segment is 1.4 mts. These segments and rings are connected by using bolts.

The TBM used to make the tunnel is from Herrenknecht and was assembled at Chennai before being brought to Delhi. The TBM was driven by Mohd Ali who is India's first TBM Operator and was assisted by Ram Avtar Singh Rana.

PTI