Two Liebherr 202 EC-B 10 Litronic Flat-Top cranes are being used to build the two towers of Lokhandwala Minerva in Mumbai, an 85-storey supertall skyscraper that will be one of the city's tallest buildings when it is completed in 2015.

Contractor Larsen & Toubro is using two Liebherr 202 EC-B 10 Litronic climbing cranes to build the 82-storey Lokhandwala Minerva towers in Mumbai.

Developed by Lokhandwala Infrastructure, the project is designed by Architect Hafeez Contractor, with Leslie E Robertson Associates and J+W Consultants as structural engineers and construction being undertaken by Larsen & Toubro (L&T).

The two cranes were supplied to L&T by Liebherr CMCtec India Private Ltd and installed at site earlier this year. Both cranes were manufactured in Germany.

Libherr Flat Top Crane

"We are using both cranes in an unusual configuration to suit the construction sequence, says L&T project manager Palwinder Singh. During the planning stages, we had considered using two heavy duty flat/ luffing jib cranes to feed the materials as acute space constraints and logistics are the biggest challenges on this project," says Mr. Palwinder Singh L&T PM.

There is an existing tower newly built next to the site, and running behind the site is a railway line. We made the decision that the selected tower crane must have high speed and lifting capacity of more than 5 Mt and should be able to climb within the available lift shaft. We opted for Liebherr which addressed all the criteria raised by L&T for Minerva."

"The EC-B series is very familiar to us, and working with Liebherr, we were able to draw up specifications and deployment that used two 202 EC-B10 units with shorter-than-standard jibs."

"Standard jibs on this model are 65 m, but we opted for two 40 m jibs because of the site constrictions, and have started one crane at a height of 42 m and the other at 48 m to ensure the two jibs overfly each other.

The 202 EC-B 10, which is a 10 t crane, can lift 5.3 t at 40 m.

Both cranes have been located inside the lift shafts of the buildings and will climb with the structure, which reach an eventual height of 300 m. The crane itself has a maximum hook height of 63.1 m. The higher of the two units will be working at 320 m when the building tops out.

David Griffin, Liebherr's Director of Sales & Service for tower cranes in India, commended the professionalism and attitude to quality and safety of the L&T Company.

"Site personnel and people such as tower crane veterans Mr Narayanan and Mr Anand Ramadoss makes executing such crane supplies a really enjoyable procedure for our team," he said.

With 85 storeys above ground, the structure will have only two levels below ground. Parking levels will be from the 1st to the 10th floors, there will be a garden podium on the 11th floor, while from 26th to 83th, floors will be for residential use. There will be penthouses and a terrace on the 84st and 85th floors.
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