India's first Liebherr Derrick Crane
India's first Liebherr Derrick Crane dismantles a tower crane on one of the country's tallest commercial building
L & T ordered the Liebherr 200 DR 5/10 Litronic Derrick Crane recognising that towers are increasingly being specified above 200 m heights across India; with no safe and economic system for dismantling tower cranes on completion of construction.
The procurement of the Derrick Crane from Liebherr was a careful and detailed decision conducted between the L & T headquarters in Chennai and Liebherr executives. Detailed discussion between site and Liebherr's Tower Crane Solutions department were integrated in the process.
David Griffin, sales director at Liebherr-Werk Biberach GmbH, mentioned the exceptional focus on safety and professionalism of the L & T team. "Liebherr is very proud to have been selected by L & T for this exceptional supply. We see huge potential for the execution of several dismantling projects using the Liebherr Derrick Crane on L & T sites. In fact, there would appear to be enough work for additional Derrick units in India."
203 m Kohinoor Tower
The iconic, diamond-shaped tower is the centrepiece of a 5-acre development, on the site of the former Kohinoor textile mill, in Dadar West, South Mumbai.At 203 m high and 50 storeys, the tower is recognised as possibly India's tallest commercial tower.
The mixed use development, designed by gkkworks (USA) and SSA Architects (India) offers luxury retail space and a selection of world renowned signature restaurants plus a flagship luxury hotel and rooftop, open air swimming pool.
The tower has a 4-storey high lobby entrance. Thereafter a 3.9 m floor to floor height, using a combination of post tensioned and flat slab structural design, ensures a column free floor space.
With 24 lifts, the tower also features one of the fastest lifting systems in India with speeds of up to 6 m/sec.
Derrick crane
The 200 DR 5/10 Litronic was designed as a dismantling crane for the stripping down of cranes on tall buildings, bridge pylons and telecommunication towers. This why the dimensions and weights of all the individual parts of the crane are designed to enable them to be dismantled solely with the aid of a very small hoist and removed via lift shafts in buildings.The Liebherr 200 DR 5/10 Litronic Derrick Crane has no trouble in dismantling tower cranes in the 300-mt-plus payload category.
The maximum radius of the 200 DR 5/10 Litronic can be set to 20 m or 25 m as required. Using a jib for a maximum radius of 20 m, loads of 10 t can be hoisted in double-reeved operation across the whole radial area. The jib used for a 25 m radius can hoist 7.5 t at the tip, and at the point of inflexion of its load curve can hoist 10 t at a radius of 19 m. This ensures that the crane can also lower heavy parts from great heights whilst preserving a safe gap between them and the building.
The 200 DR 5/10 Litronic Derrick Crane is equipped with frequency-controlled stepless drives for all types of movement. The luffing gear has an output of 37 kW, while the hoist gear produces 45 kW.
Safety is a factor of great importance in crane operation on buildings hundreds of metres tall. The safety-orientated SPS controls in the Liebherr 200 DR 5/10 Litronic Derrick Crane monitor all movements with the tried and tested functionality found in all Liebherr luffing jib cranes.
Rapid auto-dismantling
Once the projects tower crane had been completely dismantled and lowered to ground level, the Derrick Crane was stripped down in to its individual parts lowered in to the buildings lift shafts. The maximum dimensions of the individual components are only 2.20 m x 1.10 m x 1.10 m and the maximum weight component is 1000 kg.Work experience
The 200 DR 5/10 Litronic has had its first work experience dismantling cranes in Middle East, Russia, North America and Africa.
NBMCW August 2013
