TBM Arrival To Speed Up Underground Metro Work

ST Correspondent
Thursday, 14 November 2019

The underground work for building a tunnel from Shivajinagar to Swargate for the Pune Metro is expected to gain pace following the arrival of a tunnel boring machine (TBM) at Jawaharlal Nehru Port Trust (JNPT) port of Mumbai on Wednesday.

PUNE: The underground work for building a tunnel from Shivajinagar to Swargate for the Pune Metro is expected to gain pace following the arrival of a tunnel boring machine (TBM) at Jawaharlal Nehru Port Trust (JNPT) port of Mumbai on Wednesday.
 
Pune Metro will employ four state-of-the-art TBMs to dig twin-tunnels in the underground stretch. 

The tunnel boring machine is a sophisticated, computer-controlled machine which bores the tunnel and also places precast concrete ring segments to clad the tunnel from inside. As the TBM proceeds, it creates a tube tunnel behind.
 
The tube tunnel will then be used for laying track, signalling system and electrical overhead conductor. The total rings required for a 5 km length twin-tunnel are 6,054 which are been made at the Deccan College casting yard. The diameter of the ring is 6.4 metre and each ring is made up of six parts.

The Factory Acceptance Test of a TBM which was conducted successfully on September 6 at Terratec Factory China and was witnessed by officials of MahaMetro.

Officials said that the TBM will be brought at the Agriculture College from where the tunnelling work is expected to start. The TBM will enter the shaft at Agriculture College and head towards Budhwar Peth. Five underground stations will be constructed in the underground metro at Shivajinagar, Civil Court, Budhwar Peth, Mandai and Swargate. Officials said that it would a take few days to assemble the machine before the work starts.

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