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Patna Metro’s TBM-3 lowered at Gandhi Maidan

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Patna (Metro Rail News): The first tunnel boring machine was lowered into the launching shaft for digging the tunnel between Gandhi Maidan and Akashvani underground metro station of the Patna Metro Rail Project. This is the third TBM in the series of TBMs being used for digging the tunnel being built for the underground metro station. The TBM assembly was lowered 52 feet below ground level into the launching shaft with the help of 4 strand jacks (300 MT capacity each) and a mega lift with a total capacity of 1200 MT. It takes about 5 to 8 hours for the tunnel boring machine to descend into the launching shaft.

PAtna TBM3 05

TBM 3 was lowered into a 32-meter-long and 25-meter-wide launching shaft at Gandhi Maidan underground metro station on Wednesday. This TBM will cover a distance of approximately 966 meters from Gandhi Maidan Metro Station to Akashvani Metro Station.

The weight of the TBM lowered into the underground section of Corridor II is approximately 450 metric tons. If we compare this TBM with a bus, the weight of a 50-seater bus is approximately 16-17 metric tons, so the weight of this TBM is equal to 28 buses with a 50-seater capacity.

PAtna TBM3 01

It is noteworthy that the work of digging the tunnel with two other tunnel-boring machines is already going on in Moin Ul Haq’s underground metro station. TBM 1 and 2 will travel a distance of approximately 1.49 kilometres from Moin Ul Haq to Patna University, where they will be retrieved and re-launched.

What is a launching shaft?

A launching shaft is a structure made of concrete and steel that is built to launch a Tunnel Boring Machine (TBM).


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