MUMBAI (Metro Rail News): Mumbai’s first underground Metro on the Colaba-Bandra-Seepz called as Mumbai Metro 3 completes 50% of tunneling which is 28-km of the 56-km tunneling. MMRC has achieved a major milestone in 19 months. The total length of 56-km is calculated on the basis of two up and down tunnels for the 33.5-km alignment deducting the underground station box lengths in between.
After launching Krishna-1, the first Tunnel Boring Machine(TBM) at Naya Nagar, Mahim in September 2017, MMRC has been working full steam with the help of total 17 TBMs in the underbelly of the city.
In November 2017 tunneling activity began, the first breakthrough on the alignment was achieved in September 2018, 12 more breakthroughs have been accomplished in the next only 8 months, until May 2019.
The 13 breakthroughs were accomplished at – SEEPZ, 2 at CSIA T2, Sahar Station, MIDC, Domestic Airport T1, 2 at Dadar, Worli, 2 at Vidyanagari and 2 at Vidhan Bhavan.
There are 12 launching shafts to facilitate tunneling at Cuffe Parade, Eros Cinema, Azad Maidan, Science Museum, Siddhivinayak, Naya Nagar, BKC, Vidyanagari, Pali Ground, Sariput Nagar, Sahar Road, International Airport T2. The longest tunnel so far has been the tunnel from Vidyanagari to Domestic Airport (3.9-km) and the shortest one is from Sariput Nagar to SEEPZ (562 meters). In all, 19,504 segment rings have been used to complete 28-km of tunneling.
These segment rings are manufactured at 6 casting yards – 4 at Wadala and one each at Mahul and Jogeshwari-Vikhroli Link Road (JVLR). Further 19 more breakthroughs are awaited through the 33.5-km long Metro-3 alignment.