The upcoming Metro bridge over Dhaula Kuan will add to the Delhi Metro Rail Corporation’s (DMRC) already long list of technological innovations and marvels.
The 542-metre-long bridge over one of Delhi’s busiest traffic intersections is made of four special spans, the longest being 168 metres.
According to DMRC officials, this would be the longest span in India to be built using the post-tensioned continuous casting technique and will be supported on five pillars.
Unlike metro’s elevated corridors, which are constructed using pre-fabricated segments, the spans of this bridge are being cast on site.
“There is continuous movement of traffic on eight roads at this intersection and using launching girders to put pre-cast segments in place would have hampered traffic movement,” a DMRC spokesperson said.
“Using this innovative technology, we have set up temporary steel structures or tunnel to construct the viaduct by using 2300 tonnes of steel and ensured that traffic flow is not disrupted in the area,” the spokesperson said.
According to DMRC officials, the Metro viaduct is being built over eight roads at Dhaula Kuan and also cross a railway track.
With over five lakh vehicles passing through the intersection everyday, officials said even setting up of barricades would have hampered free flow of vehicles.
To ensure smooth movement, said DMRC officials, minimum road space has been taken and roads were widened in advance.
“We have put up public-address systems to guide drivers and a special pathway has been provided for safe passage of vehicles,” he said.
The 168-metre long span will be the longest in India. The extra dose bridge over railway tracks near Pragati Maidan, on Metro’s Dwarka–Yamuna Bank corridor has a 93-metre span. A similar bridge coming up at Tughlaqabad, on the Central Secretariat – Badarpur section, will have a span measuring almost 100 metres, a DMRC official said.
The bridge is expected to be complete by October 2009. However, the 22.7-kilometre long Airport Express Link, connecting the New Delhi railway station to the Indira Gandhi International Airport, will be opened only by September 2010. Commuters will be able to reach the IGI airport in from New Delhi station in just 18 minutes.