Bored running tunnel during construction
Mott MacDonald was appointed Project Designer for the
design/build Contract MC1B, a joint venture which involved the
construction of a southern section and six underground stations on
Delhi Metro Line 2. Under the leadership of Dywidag International
GmbH, the $380 million contract was undertaken by International
Metro Civil Contractors. The joint venture also included Samsung,
Shimizu and Indian contractors Larsen & Toubro and Ircon.
Approximately 6.6km of underground tunnel was created including
4.1km of twin bored tunnels, one sprayed concrete lined bored
tunnel station and 2.5km of cut and cover tunnels covering five
stations.
Temporary works in running tunnelThe
bored running tunnels were constructed using two earth pressure
balance machine through soft ground and one rock tunnel boring
machine through rock. The remaining running tunnels and station
boxes were constructed by cut and cover techniques using diaphragm,
secant pile and king pile wall support systems. The one exception
to this is Charwi Bazar station, which due to the density of
buildings and other facilities in this area, was built using NATM
tunnelling techniques with two deep shafts constructed of diaphragm
and secant pile walls.
In addition to supplying full permanent and temporary works, we
provided full architectural and landscaping services, station
ventilation plus electrical, mechanical and civil engineering
design.
The design was principally undertaken in Delhi with a
multi-disciplinary team of over 100 staff, working in close
co-ordination with the contractor’s site team. Delhi Metro Line 2
was opened for use on 2 July 2005 and currently serves
approximately 200,000 passengers per day.
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