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News Entry# 287162
  
Nov 30 2016 (06:27)  Metro wraps up tunnelling work under Phase-III (timesofindia.indiatimes.com)
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Commentary/Human InterestDMRC/Delhi Metro  -  

News Entry# 287162     
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Posted by: rdb*^  126032 news posts
NEW DELHI: With completion of the 1.25km-long stretch between Vasant Vihar and Munirka, Delhi Metro on Tuesday announced that it has completed all the tunnelling work of Phase III.
The stretch is a part of the Janakpuri (west) to Botanical Garden corridor, also called the Magenta line. The work on this tunnel, which is about 20 metres below the surface, started in October 2015. "DMRC has completed one of the major tunnelling projects in any urban area across the world in this phase, with a record 30 tunnel-boring machines (TBMs) being used for nearly 80km-long tunnels," said a DMRC spokesman.
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total underground corridor length in Phase III, including stations, is about 54km. This includes the Janakpuri West-Botanical Garden (Magenta line) and Majlis Park-Shiv Vihar (Pink line) corridors. Of the 38km-long Janakpuri West-Botanical Garden corridor, about 23km is underground.
The Metro official said, "In the last phase of Metro construction, only 35km was underground and in Phase I, only 13km was below the surface."
The official added that the tunnelling work on the Magenta line had multiple engineering challenges. The new tunnels passed below operational elevated viaducts at three locations — at Janakpuri West below Blue line, near IGI Airport below Airport line and near Kalkaji Mandir below Violet line. "At Hauz Khas, the new tunnel passed below the operational Yellow line tunnel," the official said. The construction of a 1.4km-long tunnel between Shankar Vihar and Vasant Vihar on this section was also a challenge as it passed below the rocky Aravali range and special rock TBMs had to be used.
On the 59km-long Majlis Park-Shiv Vihar corridor, about 19km is underground. This is the longest corridor on the DMRC network. On this section, the new tunnels passed below operational viaducts at three locations—at Azadpur below the Yellow line, Netaji Subhash Place below the Red line and at Lajpat Nagar below the Violet line. The new tunnel also passed below the operational Metro tunnel of Yellow line at INA.
Delhi Metro's longest tunnelling drive of 1.6km from Ashram to Nizamuddin also falls in this section. All the tunnelling work on this line has also been completed. "However, the TBMs are being retrieved at some locations," the official added.
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