The first Tunnel Boring Machines to be used for the Metro-III corridor will reach Mumbai in July, from Guangzhou in China. Mumbai Metro Rail Corporation has set a deadline of September 2019 to complete the tunnelling work. The TBM will be procured from German major Herrenknecht AG, from its manufacturing facility in China. The machine will deployed for construction of the 6.08-km twin tunnels from Siddhivinayak to Dharavi through TBM launch shafts located at Naya Nagar in Mahim.
The machines will initially have to be assembled after they reach the city, which is a time-consuming process. The contractors on the seven civil packages of the entire Bandra-Colaba-Seepz alignment of Metro-III plan to deploy a total of 17 TBMs from leading manufacturers such as Robbins, Terratec, Herrenknecht and STEC. Of the 17 TBMs to be used, 10 will be new while seven machines will be refurbished.
A shaft 25 m deep into the ground is being built at Naya Nagar. Work on the project had earlier been held up due to the stay order on cutting of trees.
MMRC said it hopes to run the first train on the underground corridor by 2020 between Seepz and Bandra-Kurla Complex (BKC). The remainder of the corridor will be opened within a year after that.