New Delhi: Setting the ball rolling, Delhi
Metro today launched the process of boring tunnels for
construction of a 3-km underground corridor aimed at
decongesting the busy Rajiv Chowk station under the ambitious
The Central Secretariat-Mandi House corridor that will
have two stations will be ready by the end of 2014 and is
expected to take most of the passenger load from the Rajiv
Chowk station which sees a footfall of at least 4 lakh a day.
The tunnelling machine that has been brought from German
company Herrenknecht and assembled in Chennai were lowered
today near Chemlsford Club in central Delhi and the tunnelling
work till Janpath will be completed by June 2012.
"It is an important event of the Phase-III. The TBM was
lowered today. I congratulate the entire team for this job. We
will be using more than 20 Tunnel Boring Machines (TBMs) in
the Phase-III which is a very safe method," DMRC Managing
Director Mangu Singh told reporters at the site.
Phase-III envisages to connect another 103 km of Delhi to
the Metro network by 2016. The Central Secretariat-Mandi House
stretch is part of the Central Secretariat-Kashmere Gate
corridor that will be integrated with the existing
Badarpur-Central Secretariat Line.
Once this 3-km stretch becomes operational, Mandi House
will serve as an inter-change station thus allowing passengers
from Noida and Anand Vihar to come to Central Secretariat
without having to go to Rajiv Chowk.
Singh said the TBMs will be used in this corridor because
it passes through the Old Delhi area which has a number of old
and heritage buildings.
The alignment of the tunneling activities will be
controlled by Tunnel and Underground Integrated Software
Structure VMT-TBM Guidance System where a motorised total
station is placed along the alignment and reflector is placed
near to the cutter of the TBM.
The lowering of the TBM was done with a boom length of
35.6 metres at a radius of 13.5 metres and the lowering
process will be completed in the next three days.
The tunelling from Central Secretariat to Janpath will
cover 924 metres as two TBMs will be used for boring tunnels.
Calling the Line "sensitive", Singh said the Delhi Metro
surveys the buildings under which tunnelling would be done
before the start of the process and modifies the design
according to the structure.
About Chinese companies being involved in Metro projects,
the DMRC chief said: "We don`t go by names. Only thing which
matters is credentials. We go by performance only. We have a
number of strict conditions which contractors will have to
On reports that people experience vibration in some of the
areas in Phase-III, he said such incidents have come to light
in Saket and in an area on the Airport Metro Express corridor.
"There are specific points. We have consulted some people
and we are formulating solutions for this. In Phase-III, we
are being over cautious," Singh said.
He also said the Delhi Metro will introduce eight coach
trains from June this year on congested corridors and all
four-coach trains would be converted into eight-coach ones.
On the increasing number of suicides at Metro stations, he
said steps were being taken to sensitise Metro staff about
what has to be done in such circumstances.
"We are also creating awareness among the public on this
front," he said.