A Liebherr 71 EC-B 5 FR. tronic Flat-Top crane, set on a custom-built base at foundation level to ensure a secure working height over the surrounding residential buildings, is being used by developer/contractor Nahalchand Laloochand Pvt Ltd (NL); to construct one of Mumbai's new generation tall apartment buildings.
The crane has been supplied by Liebherr India Pvt Ltd, which is headquartered in Mumbai.
With building height restrictions now being eased in parts of Mumbai, which has until recently been primarily a low-rise city, new commercial and residential buildings are being developed that reach heights of 90 m and more.
The Aravat residential building, that is about to be constructed by NL in the suburbs of Mumbai, will reach 30 storeys and have a height of 110 m, and the Liebherr 71 EC-B 5 FR. tronic will climb with the structure as it grows.
Although the site is on the fringe of open countryside, it is bounded on three sides by residential buildings of eight and 12 storeys. Consequently the clearance of the boom at the foundation stage has necessitated the construction of a 5.5 m steel base, which stands on top of a 2 m concrete block.
"The excavation for the foundations is about 10 m deep," says NL's chief engineer on the site Prakash Parab. "The crane stands at about 45 m in height, so to comply with safety requirements for the surrounding buildings we constructed this base on the site, and mounted the crane upon that."
The crane has a boom length of 50 m and can handle a maximum load of 5 t, or 1 t at the full reach, which is enough to cover the project area but necessitates the boom oversailing part of the adjacent residential area.
Liebherr delivered the crane to the site in January, and it was installed on its steel and concrete base with the help of a German engineer. Construction time for the building is scheduled at two-and-a-half years.
"This is the first tower crane to be purchased by NL," says Mr Parab. "Now that parts of Mumbai are allowed to have taller buildings we decided to make the investment in the Liebherr brand because of quality and reliability, and with a view towards other high-rise developments."
NL is one of India's leading real estate developers, and is the first in the country to offer a legal guarantee of possession on the predetermined dates of its projects, displaying its confidence of managing construction schedules.