Afcons adopts new tunneling technology in Ahmedabad metro

Afcons has begun work on the Ahmedabad Metro project’s underground (UG-1) section using a tunnel boring machine (TBM) without a diaphragm wall (D-wall). The Istanbul Metro was built using this technique in the past.

In the UG-1 project of the Ahmedabad Metro, Afcons is building two underground stations, twin tunnels measuring approximately 3.5 km in length, a cut and cover segment, as well as a ramp connecting elevated and underground parts. The head-wall construction came to a halt as a result of the delay in the transfer of the land for Kankaria Station and several other obstacles, preventing the first TBM, which was prepared for commissioning, from being started. The project team developed a new methodology of TBM pass through without a D-Wall at Kankaria Station to reduce the delay and speed up execution. In top-down construction, the station box D-Wall is positioned before TBM pass through. By using this novel approach, the delay was prevented from having a chain reaction. The width of the station was then enlarged.

The TBMs were released from the launching shaft as tunnelling for both the eastbound and westbound lines began, according to project manager S. Nakkiran. By building permanent rings, the tunnelling for both routes was successfully completed. The TBMs were then collected at Kalupur Station. When it comes to Kankaria Station, the D-Wall of the main station box was built in stages. The team also created an internal calibration device for the ground pressure sensor to guarantee the TBM’s seamless operation.

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