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DMRC building longest span on bridge

A graphic showing the 100-metre-long bridge being constructed by DMRC near Okhla.

NEW DELHI: The Delhi Metro railway is constructing a 100-metre-long span, the longest it has constructed so far on a bridge, which will pass over the railway tracks near Okhla here. The bridge is coming up over an operating railway line.

Referring to the construction, a Delhi Metro Rail Corporation spokesperson said: “The DMRC had to use such a long span over the Northern Railways track since four railway lines pass below the bridge. We are using the cantilever construction methodology for its construction so that the rail traffic below the metro corridor is not hampered. The bridge is being built using M-60 grade concrete and about 130 workers are engaged in construction of the bridge.”

A difficult task, the construction of the bridge is also tricky as it is being built on a very sharp curve with a 300 metre radius. According to DMRC officials, installation of the individual segments of the bridge on the curve is difficult as the rail traffic moving below cannot be obstructed during the construction. “The existing rail tracks below this bridge link New Delhi with Agra, Mathura on Mumbai main line and then to other parts of the country and therefore is an very important stretch. Earlier, the Delhi Metro had constructed a bridge over the railway lines near Pragati Maidan, where the length of the main span was 93 m.”

The bridge, which will be between the Okhla and Jasola metro stations, will be 250-metre-long and is divided into three spans. While the middle span will be of 100 metre, the other two spans on the sides will be of 75 metre each. This bridge is a part of the 20.16 km long under-construction Central Secretariat-Badarpur standard gauge corridor that is scheduled to be completed by September 2010 before the Commonwealth Games.

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