In August this year MMRC (Mumbai Metro Rail Corporation) completed the 1.5-km long tunnel beneath Mithi River. The Terratec-made TBM Godavari-4 completed the upline stretch of 1.5-km from BKC to Dharavi. Godavari-4, started boring on August 21, 2019 from BKC launching shaft and used 1,043 rings to build the tunnel to Dharavi. This is 29th breakthrough on the Colaba-Bandra-SEEPZ Metro-3 corridor.
Earlier in March this year, Godavari-3 had completed the downline tunnel of 1.5-km from BKC to Dharavi. Out of the total 3-km (Up and Downline) stretch from BKC to Dharavi, 484-m tunnel lies below the active Mithi river channel. Package-5 which consists of Dharavi, BKC, Vidyanagari and Santacruz stations has completed the entire tunnelling which was 8-km.
In April 2020 MMRC achieved its 28th breakthrough at Package-2 from Chhatrapati Shivaji Maharaj Terminus to Mumbai Central with TBM Vaitarna-2 (click here for the video). Vaitarna-2, the first machine to completed the 3.8 km in a single drive, was commissioned on February 2, 2018 from the CSMT launching shaft and completed its longest run at Mumbai Central station with 2,730 rings in 26 months at an average of 6.3 m/day. The alignment ran very close to old and dilapidated city buildings and parallel to the seashore with a very shallow ground water table which is approximately 1-4 m below ground. The 3.8-km long tunnelling, on the Colaba-Bandra-SEEPZ Metro-3 Corridor, includes 5 underground stations: Chatrapati Shivaji Maharaj Terminus, Kalbadevi, Girgaon, Grant Road and to Mumbai Central.
In March 2020 MMRC accomplished it's 27th breakthrough and the first one beneath the Mithi River. The Terratec made TBM Godavari-3 tunnelled 1.5 Km within 287 days using 1072 rings. Package-5 has now completed 7.5 Km of the 7.9 km tunnel (click here for the video). MMRC has now completed 85% of tunnelling with the help of 17 TBMs and about 59% of overall construction work.
For further information please click here and in/77 for the tunnelbuilder archive. Also visit https://www.mmrcl.com/en. 34/20.
