First time in India, pre-fab casts for Metro stations

First time in India, pre-fab casts for Metro stations

The Noida-Greater Noida Metro corridor is poised for yet another record. For the first time in the country, Delhi Metro Rail Corporation (DMRC) has started the concreting of the biggest precast pier cap to be used for the 21 station platforms along the 29-km elevated route.

Each station will support five pier caps, with each cap weighing 160 tonnes.

The state-of-the-art caps are being designed by Spanish firm Ayesa, while the technique is being provided by French company Systra engaged by DMRC. The foundation for the first precast post-tensioned pier cap was laid by the Noida Metro Rail Corporation (NMRC) managing director on Tuesday.

According to DMRC officials, a total of 105 pier caps will be precast. "These will support the U-girders and the platforms at the 21 stations," explained DMRC's Pramit Garg, project director of the Noida-Greater Noida Metro track. "Normally in other Metros in the country, the biggest pier cap used up to now has been 2.50 metres wide and 11 metres long. For the Noida-Greater Noida Metro track, we will be casting post-tensioned pier caps measuring 2.90 metres wide x 17.5 metres long and 2.5 metres deep, which will be done for the first time in India," he said.

Santosh Yadav, Managing Director, NMRC said that this monolithic pre-casting technique will be a unique feature of the Noida-Greater Noida Metro corridor. "The concreting for the slabs has commenced on Tuesday. The first of the caps will be launched 15 days from now. This will be done simultaneously at all the 21 stations along the route," Yadav said. "Till now, in India all three portions of a platform have been cast separately. But this could lack certain advantages that a monolithic structure brings to an elevated Metro track," he said.

"These caps are fabricated off-site and then connected on-site, allowing construction to be carried out more rapidly. The use of these precast components also enhances work-zone safety and reduces environmental impacts, besides providing good seismic resistance, durability as well as easy assembly," Yadav said.

Meanwhile, DMRC also made a presentation to the state environment impact assessment authority (SEIAA) in Lucknow to obtain environmental clearances for the track under construction. NMRC had earlier filed for an environmental clearance with the Union ministry of environment and forests. Green activists of Greater Noida have been pressing the NMRC to procure an environmental clearance for its Noida-Greater Noida extension project.

According to DMRC officials, all civil work for the track will be completed by June 2017. The Metro, which is estimated to cost Rs 5,533 crore, is expected to roll by December 2017.

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