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Delhi Metro successfully tunnels along Qutub-Saket stretch

The Delhi Metro Rail Corporation successfully achieved the final breakthrough in tunnelling along the 1.85-km Qutub Minar-Saket stretch using the ‘New Austrian Tunnelling Method’ on the Central Secretariat-Gurgaon corridor of Phase-2 on Wednesday.

Written by Express News Service | New Delhi |
June 18, 2009 2:13:44 am

The Delhi Metro Rail Corporation successfully achieved the final breakthrough in tunnelling along the 1.85-km Qutub Minar-Saket stretch using the ‘New Austrian Tunnelling Method’ on the Central Secretariat-Gurgaon corridor of Phase-2 on Wednesday.

The 185-m section tunnelled on Wednesday lies at the south-end of the Saket Metro station. This stretch also has a cut-n-cover underground tunnel.

“The Tunnel Boring Machine was not used here as the distance was small and lowering the machine near the Archaeological Survey of India protected Pithiora Rai Ka Kila would have been difficult and very expensive,” Anuj Dayal,DMRC spokesperson,said.

“All precautions prescribed by the ASI had to be observed as construction activity was carried out close to the monument,situated in the vicinity of the Saket Metro station,” he said.

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This is the first time that Delhi Metro engineers used the New Austrian Tunnelling Method in soft soil; so far the method has been used in hard rock conditions in Chawri Bazar and the Ridge area near Talkatora Garden. Tunnel construction in soft soil is very tricky as the soil has to be immediately cemented and strengthened to prevent a collapse.

The civil contractor for tunnelling on the Qutub Minar-Saket stretch is Larsen and Toubro.

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