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More TBMs to arrive at the launching shafts of Metro-3

Wednesday, September 13, 2017
By Priyanka Dhomse

The MMRC (Mumbai Metro Rail Corporation) has already received its first Tunnel Boring Machine (TBM) at the beginning of this month and is set to have more at several other locations. A total of 17 TBMs will be used for construction of the Colaba-Bandra-SEEPZ Metro-3 Corridor. The MMRC authorities assured that work of the TBMs will not cause any trouble for Mumbaikars.

According to the official, the first TBM which has arrived at Naya Nagar will be functional in September itself. The steel base has already been lowered at the Naya Nagar launching shaft. Parts of the TBM will be assembled on the steel base before beginning the tunnel boring works. The tunnel boring will begin only after the Chief Minister's inauguration ceremony this month.

The weight of the Tunnel Boring Machine is between 700-800 tones with a diameter of 6.4 metres, the 100-metre-long machine will help in building a tunnel of finish size of 5.8 metre.

The TBMs manufactured by the various companies, consists of 10 new and 7 refurbished Tunnel Boring Machines which will be launched at locations like Cuffe Parade, Azad Maidan, Science exhibition centre, Siddhivinayak, Sahar, Marol naka, Pali, Naya Nagar, Terminal-2 and BKC.

“The tunnel with a diameter of 6.4 metres will be formed once the machine starts functioning. A distance of 8 to 14 meters will be covered by the machine per day. The under ground drilling from Naya Nagar which will begin with the help of the TBM, will come out at Dadar after a year covering a distance of 2.5km,” said S K Gupta, Director (Projects), MMRC.

A total of 100 workers will be deployed on the site when the TBM process starts, of which 30 people will be working underground per shift. “The tunnel will have a walk way for the workers. Air conditioned breathing operators will be installed into the tunnel which will maintain the temperature around 30-31 degree celsius and we will also adhere to other safety protocols,” said Gupta.

As for the residents living in vicinity of the Metro-3 construction site being worried about the machines vibration affecting the heritage structures located nearby, Gupta assured “The distance between the machinery operation and the foundation of structures located around the site is maintained at around 15 metres. Hence, it will not affect any of these structures. Therefore, we would suggest that people should not unnecessarily worry about the same.”

According to the official, around 4-5 TBMs will arrive in September, 5, more will come in October, and 3 will arrive in November. Rest of the TBMs will be arriving by February at the remaining launching shafts.

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