DMRC will use latest international technology in third phase

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NEW DELHI: If you’ve been dreading the start of work on phase III of the Delhi Metro network with the resultant traffic snarls, here’s a piece of good news. The Delhi Metro Rail Corporation (DMRC) will use the latest international technology in the third phase to save time and trouble during construction.

Said a DMRC spokesperson , “We will be using 25-metre-long girders on some of the elevated viaducts in phase III.” These girders are considerably longer than those used in phase II, which were four to six metres long and took more time during construction. Added the spokesperson, “These girders are precast in the casting yards, brought to the site on trailers, and launched with the help of cranes which take less time than the conventional segmental launching technique involving the use of launching girders.”

DMRC officials say the use of these girders will save time as well as minimize the inconvenience caused to people during the construction. Delhi Metro had used these 25-metre girders in the construction of the Airport Express corridor as well, which was completed in 27 months.

Sudhir Vohra, architect and urban planner, said that the move to an international technology is a much-awaited decision from the DMRC. Vohra , who has been at loggerheads with the Delhi Metro over the Zamrudpur Metro pillar collapse, added, “This should have been done five years ago… It’s a good technology and DMRC is going the right way on this.” The use of longer pre-cast pieces, with superior quality concrete is the basis of this technology, said Vohra.

DMRC officials said the traffic diversions and barricading on the roads will be for shorter durations with the use of the new technology. For the construction of longer spans, which will come up over traffic intersections, the 25-meter girders will rest on specially designed pier caps cantilevering towards the tracks on both the sides. “Custom designed concrete decks will be put on the top of these pier caps to bridge the gap between the 25-meter-long girders ,” added the official.

For curing of the civil structures to enhance their strength and durability, “sophisticated curing compound coating” is being explored in keeping with international practices. High quality concrete will be used while parapets on elevated viaducts will be much sleeker and, therefore , easier to handle, added officials. Apart from this technique , DMRC will also use steel girders on spans measuring 40 to 50 metres. Such steel girders have been used earlier in Phase II and Phase 1 at various locations, the spokesperson said.

The phase III, which will see another 108km of the city getting connected with the Metro, has been cleared by the urban development ministry’s empowered committee and the proposal is currently before the group of ministers (GoM).
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This post was submitted by prashant agarwal.

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