The project is one of a number currently being carried out by MCGM to augment and improve its wastewater distribution system to meet increased demand and ensure reliable supply.
The 3.2m-diameter open TBM will bore a total of 5,350m between three shafts of depths up to 105m. The finished 2.5m-diameter tunnel from Amar Mahal (Hedgewar Udyan) to Trombay Low-Level Reservoir and further up to Trombay High-Level Reservoir will lie at an average depth of 80-90m.
The TBM’s modular design allows launch and reception to take place through shafts, while disassembly can take place inside the tunnel. The cutterhead is equipped with 18 heavy-duty back-loading disc cutters while the VFD-controlled electric motors enable a cutterhead rotation of more than 10rpm with optimum torque.
To allow safe tunnelling throughout the alignment, the machine is equipped with ground supporting equipment, including a fixed probe drilling unit, two rock-bolting drills and a steel arch erector.
In recent years, Terratec has enjoyed success in the Indian market, having worked on numerous metro projects such as in Delhi, Lucknow, Ahmadabad, Mumbai and Pune.
