DMRC Achieves First Tunnel Breakthrough On Central Secretariat - Badarpur Corridor
Delhi Metro`s preparations for the Commonwealth Games, 2010 achieved a major milestone on 21st
January 2009 with the first tunnel breakthrough of the under construction Central Secretariat - Badarpur corridor at the Jawaharlal Nehru Stadium Metro station site.
A Tunnel Boring Machine (TBM) emerged at the Jawaharlal Nehru Stadium site after making a 586 metre-long tunnel from Jungpura. The Jawaharlal Nehru Stadium Metro station will provide connectivity from the main Games venue to the other parts of the city.
This TBM was lowered in Jungpura shaft on September 9th
, 2008 and after assembly of the TBM below the ground, tunneling was started from October 13th, 2008. The tunneling was done 15 - 16 metres below the earth surface.
After the tunneling process, the excavated earth was deposited in the earth fill area of the Sarita Vihar MRTS depot.
A total of 456 rings were installed simultaneously along with the tunneling process. Each ring has six segments (275 mm thick). These segments and rings are connected by using bolts.
While the breakthrough was achieved on the down line, another TBM is operational on the parallel up line and is likely to breakthrough after 10 days. Another two TBMs are deployed on the Udyog Bhawan - Khan Market (1776 m) stretch. All the tunneling activities on the corridor are expected to be completed by August 2009. These TBMs are manufactured by Herrenknecht of Germany.
ITD - ITD CEM Joint Venture are the contractor for the construction of the stretch from Udyog Bhawan to Lajpat Nagar on the Central Secretariat - Badarpur corridor scheduled for completion in September 2010.