Delhi Metro builds first crossover viaduct

NEW DELHI: Delhi Metro on Sunday completed the construction of its first crossover viaduct above the existing operational line at east Delhi's Karkardooma Metro station. The viaduct, which is 21m above the ground, is one of the highest points in the Phase III network. "This is among the first of such achievements in the Metro construction," said Delhi Metro Rail Corporation spokesperson Anuj Dayal.

The new Metro line, which is part of the Mukundpur-Shiv Vihar corridor, crosses the existing (Vaishali- Dwarka) elevated line at 21m above the ground and is 10m above it. The work was completed without disrupting passenger services, said a Metro official.

The 59km line is crossing the existing Metro line alignment at Karkardooma just before the station at an angle of 114 degrees. DMRC had to carry out segmental erection for putting a special span of 37m between piers 254 and 255. "Construction for crossing over of Metro viaduct at Karkardooma Metro was challenging as this is one of the highest crossings," the spokesperson added.

The elevated viaducts of Phase III will pass over existing viaducts of the previous two phases at four more locations—Netaji Subhash Place, Dhaula Kuan, Mayur Vihar I and Anand Vihar.

Dayal said extensive round-the-clock CCTV monitoring was done adjacent to the rail track to avoid electrocution and fall of material during crossing. Earthing was done for the launching girder, pre-stressing beam and erected segments on the span. The reason for going so high is the location of the existing station, say DMRC officials. "The present station is part of Yamuna Bank-Vaishali corridor which goes from Preet Vihar to Karkardooma and then to Anand Vihar. The new corridor, coming from Trilokpuri and passing Anand Vihar, will cross Yamuna Bank-Vaishali at 90 degrees," the official said.

The clearance between the two lines is 10m. The existing station height is 14.5m. While the Yamuna Bank-Vaishali corridor is built on broad gauge, the Mukundpur line will be built on a standard gauge. Till now, Akshardham was the highest station on the network, officials said.

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