Underground tunnel work on Aerocity corridor done
New Delhi: The
Delhi Metro Rail Corporation
(DMRC) completed the construction of an underground tunnel between Kishangarh and Vasant Kunj Station on the Tughlaqabad-Aerocity corridor on Wednesday, a key aspect of phase 4 expansion.
The tunnel boring machine (TBM) broke through at Vasant Kunj Station after boring a 1,550-metre-long tunnel. This milestone was accomplished with a massive 91-metre-long TBM. Two parallel circular tunnels for up and down movement are being constructed on this stretch. The breakthrough on the other parallel tunnel was achieved on March 6 this year, a statement from DMRC said.
The new tunnel was built at an average depth of about 22.86 metres (minimum depth 15.48 metres and maximum 30.25 metres).
About 1,105 rings were installed in the tunnel, with an inner diameter of 5.8 metres. The tunnel was built using the 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 at Mundka. The concrete segments were cured with a steam curing system to achieve early strength.
"All necessary safety precautions were taken during the construction of the tunnel below the existing structures.
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Ground movements were monitored with highly sensitive instruments fixed on nearby structures, ensuring that there was no settlement anywhere," said a DMRC official.
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As part of the phase 4 expansion work approved so far, the DMRC is constructing 40.109 kilometres of underground lines. The Aerocity-Tughlaqabad corridor has underground sections totalling 19.343 kilometres. The machine used, TBM, excavates tunnels with a circular cross-section through various soil and rock strata.
They can be designed to bore through anything from hard rock to sand.
"TBMs have revolutionised tunnelling work worldwide, enabling tunnels to be bored without disturbing buildings and other surface structures. TBMs are particularly useful for underground tunnelling work in congested urban areas. DMRC has been using TBMs for its tunnelling work since Phase 1. In phase 3, when approximately 50 kilometres of underground sections were built, about 30 TBMs were deployed in the national capital," said DMRC in a statement.
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