Chennai Metro Rail’s TBMs to begin tunneling between Thiruvanmiyur and Indira Nagar for phase II project in November

Chennai Metro Rail is each acceptable to commencement tunnelling enactment successful 1 of the astir challenging stretches for the upcoming signifier II task betwixt Thiruvanmiyur and Indira Nagar successful November.

Two passageway boring machines (TBM) volition make duplicate tunnels for a region of astir 650 metres betwixt Thiruvanmiyur and Indira Nagar.

In the 118.9 km signifier II project, corridor 3 from Madhavaram to SIPCOT via Adyar whose magnitude is 45.8 km has a important information of underground web of 26.8 km; 1 of them is the Thiruvanmiyur to Indira Nagar stretch. In a fewer years, trains originating from Madhavaram volition instrumentality commuters done astatine slightest 40 locations including Thiruvanmiyur and Indira Nagar earlier reaching SIPCOT.

Officials of Chennai Metro Rail Limited (CMRL)said they person been excavating for a fewer weeks present astatine Thiruvanmiyur presumption site; portion 1 of the TBMs person been lowered, the different volition beryllium done soon. 

The large situation present is excavation of the tract owed to the beingness of hard rock. “We did expect to brushwood hard stone astatine Thiruvanmiyur but didn’t foresee that it would beryllium specified high-quality hard stone similar granite. Initially, the contractor planned to transportation retired controlled blasting to interruption them and implicit the excavation. But arsenic a amended alternative, the contractor chose to usage chemicals and disintegrate the hard rock,” an authoritative said.

CMRL officials added they are presently excavating astatine a extent of 22 metres astatine Thiruvanmiyur. Owing to the beingness of hard rock, the tunnelling enactment excessively whitethorn beryllium rather dilatory successful this 650-metre agelong betwixt Thiruvanmiyur and Indira Nagar. Ideally specified a abbreviated agelong tin beryllium completed soon, but officials expect that it whitethorn instrumentality astir a twelvemonth for the machines to make duplicate tunnels. 

“If the instrumentality perpetually drills done hard rock, the cutter caput discs of the TBM volition deterioration retired soon and we volition person to transportation retired a process called cutterhead involution and alteration the parts. Cutterhead involution whitethorn person to beryllium done respective times for some machines on this agelong and could beryllium clip consuming,” an authoritative said.