BMRCL uses box-pushing method for the first time to construct 77-meter tunnel under Nagawara flyover, overcoming multiple challenges.

The Bangalore Metro Rail Corporation Limited (BMRCL) has successfully built a 77-meter tunnel under the Nagawara flyover, connecting to the upcoming Nagawara interchange Metro station. This tunnel is part of the Namma Metro’s Pink Line project, which will link Kalena Agrahara with Nagawara.

For this tunnel, BMRCL used the box-pushing technique for the first time. This method involves pushing precast concrete boxes under the flyover using hydraulic jacks. A total of eight boxes were pushed into place on the south side of the new Nagawara station.

The construction faced multiple challenges due to the presence of power and water cables, as well as telephone lines under the Nagawara flyover. However, the box-pushing technique was crucial in avoiding traffic disruptions at the busy Outer Ring Road (ORR) junction, which is a key route to Kempegowda International Airport and nearby tech parks.

An official from BMRCL explained, “Adopting the box-pushing technology was crucial to avoid disrupting traffic flow at one of the major junctions on Outer Ring Road. It took almost six years for the authorities to complete the task.

As part of the Pink Line project, BMRCL is constructing a 21-kilometer tunnel from Dairy Circle to Nagawara. So far, 19.7 kilometers have been completed using nine tunnel-boring machines, with seven machines already finished. The remaining two machines, Tunga and Bhadra, are nearly done and will emerge near Nagawara station, about 150 meters away. All tunnel work is expected to be completed by the end of the year.

The Blue Line, which will connect Central Silk Board with Kempegowda International Airport (KIA), will also pass through Nagawara station. This development marks a significant milestone for Namma Metro, enhancing connectivity and easing traffic congestion in Bengaluru.