Delhi metro bores tunnel between Tughlakabad and railway colony
Delhi Metro
Rail Corporation (
DMRC
) on Tuesday achieved a construction milestone with the completion of the underground tunnel between Tughlakabad and Tughlakabad Railway Colony on the Tughlakabad-Aerocity corridor which is part of the Phase IV expansion.
The 23.622-km Tughlakabad to Aerocity corridor is the new Golden Line that will have 15 stations.
A tunnel boring machine (TBM) broke through at Tughlakabad Railway Colony station after ploughing through a 0.792-km tunnel. The tunnel breakthrough was achieved using a mammoth 91-metre-long boring machine. Two parallel circular tunnels for up and down movement are being dug on this stretch as part of the Aerocity–Tughlakabad corridor.
The civil contractor that implemented this project is M/s Afcons Infrastructure Ltd.
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This tunnel was constructed at an average depth of approximately 18 metres. About 559 rings were installed in the tunnel, with an inner diameter of 5.8 metres.
"The tunnel was built using the proven technology — Earth Pressure Balancing Method — with a concrete lining made of precast tunnel rings. These tunnel rings were cast at a fully mechanised casting yard set up in Mundka.
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The concrete segments were cured with a steam curing system to achieve early strength," said Anuj Dayal, principal executive director of corporate communications at DMRC.
He added that all necessary precautions were taken during the tunnel construction below the existing built-up structures. Ground movement was monitored with highly sensitive instruments fixed to nearby structures, ensuring that there was no settlement anywhere, Dayal said.
As part of the Phase IV work approved so far, 40.1km of underground lines are being constructed. The Aerocity-Tughlakabad corridor has underground sections totalling 19.3km.
A tunnel boring machine is used to excavate tunnels with a circular cross-section through various soil and rock strata. These can be designed to bore through anything from hard rock to sand. The machines have revolutionised tunnelling work worldwide, enabling tunnels to be bored without disturbing buildings and other surface structures.
The boring machines are particularly useful for underground tunnelling work in congested urban areas. DMRC has been using these for its tunnelling work since Phase 1. In Phase 3, when approximately 50km of underground sections were built, about 30 such machines were deployed.
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