Delhi Metro Rail Corporation (DMRC) has today completed an important construction work in Phase 4, in which the longest underground tunnel has been constructed between Tughlakabad Air Force Launching Shaft and Maa Anandmayi Marg. Let’s know the specialty of this tunnel.
Golden Metro: Delhi Metro completed a 2.65 km long tunnel in South Delhi, which is the longest tunnel of the fourth phase. In fact, Delhi Metro Rail Corporation (DMRC) today achieved an important milestone by completing the construction of the longest underground tunnel under Phase 4. This tunnel has been built between Tughlakabad-Air Force Launching Shaft and Maa Anandmayee Marg, which is part of Tughlakabad-Aircity Corridor of Phase-IV.
The success of the tunnel boring machine (TBM) ‘Amrit’ at the Maa Anandmayee Marg site was celebrated in the presence of DMRC Director Projects and Planning, Rajiv Dhankar, and other senior officials. This tunnel boring machine reached Maa Anandmayee Marg station this morning after boring a 2.65 km long tunnel.
This tunnel is made with a 105 meter long boring machine
This tunnel has been built with the help of a 105 meter long giant TBM. Two parallel circular tunnels are being constructed on this section, which involves up and down movement. The second parallel tunnel is to be completed in January 2025. This project has been built with the help of a private company named Afcons. This new tunnel has been constructed at an average depth of about 16 meters. About 1894 rings have been installed in the tunnel, whose internal diameter is 5.8 meters.
The tunnelling work was technically challenging, involving difficulties such as shifting of a sewer line, passing through hard rock. The tunnel has been constructed using EPBM (Earth Pressure Balancing Method) technology, with concrete lining of precast tunnel rings. These tunnel rings were fabricated at Mundka in a fully mechanised casting yard.
All necessary safety measures were adopted during construction. Ground movements were monitored through highly sensitive equipment to ensure no sedimentation. So far, 40.109 km of underground lines are being constructed as part of the approved Phase 4 work. The Aircity-Tughlakabad corridor comprises a total of 19.343 km of underground sections.
TBMs are used to excavate tunnels with circular sections through various soil and rock layers. These machines have currently revolutionised tunnelling, allowing tunnels to be built without affecting surface structures and buildings. DMRC has used TBMs for its tunnelling work since Phase 1, especially in congested urban areas. In Phase 3, when about 50 km of underground sections were built, around 30 TBMs were deployed in the nation’s capital.
We have taken all measures to ensure that the information provided in this article and on our social media platform is credible, verified and sourced from other Big media Houses. For any feedback or complaint, reach out to us at informalnewz@gmail.com
