The EPBM broke through at Tughlakabad Railway colony station on Saturday after boring a 0.792km-long tunnel. Two parallel tunnels are being constructed on this stretch as part of the Aerocity–Tughlakabad corridor. The breakthrough on the parallel tunnel is expected to be achieved in July.
The new tunnel has been constructed at an average depth of approximately 18m. About 566 rings have been installed in the tunnel, which has an inner diameter of 5.8m. The tunnel rings were cast at a fully mechanised casting yard at Mundka. The concrete segments were cured with a steam curing system to achieve early strength.
As part of the Phase IV work approved so far, 40.109km of underground lines are being constructed. The Aerocity-Tughlakabad corridor has underground sections totalling 19.343km.
The latest breakthrough follows completion of tunnelling between Chhatarpur Mandir and Ignou Station in February, and between Kishangarh and Vasant Kunj Station in March.
