Responding to the needs of cities around the world, Linden Comansa has this week launched a new luffing jib crane, the largest in its range of luffing jib tower cranes to date.

The LCL700 features a high-capacity hoist cable drum that enables the crane to construct buildings of over 1000 metres in height.

Linden Comansa pointed to the increasing use of high-tonnage, prefabricated components and extremely large steel beams in construction, particularly in big cities such as Melbourne, Frankfurt, London and Seoul, saying the use of these types of components reduce project completion times.

When these projects are located in areas with space constraints such as cities, there is often a need to use large cranes with luffing jibs that enable them to lift extremely heavy loads while avoiding other cranes and nearby cities.

Responding to this growing trend, the company has launched the LCL700, which comes in two versions with maximum load capacities of 64 and 60 tonnes.

By means of simple manual modifications, the maximum load capacity of the cranes can be reduced to 32 and 25 tonnes respectively, resulting in increased hoist speed and productivity. This change on the hoist system from double line to single pull line is one of the many improvements that have been implemented in this model based on recommendations from Linden Comansa clients.

The maximum radius of the LCL700 is 65 metres and can be reduced in increments of 5m to 30m. The LCL700 64t can lift a maximum load of 7.2t at maximum reach while the LCL700 50t can lift 7.5t. The minimum reach of both models is just 4m, allowing maximum use of the space at the construction site.

The LCL700 also boasts an excellent 'out-of-service' jib radius of between 20.4 and 16 metres depending on the maximum reach, providing a greater level of safety on the construction site when the crane is not in use.

The radius of the counter-jib is also extremely short, measuring just 9.5m, with the potential to be reduced to 8.7m by assembling the crane with steel counterweights rather than the standard concrete counterweights. Despite its size, the counter-jib is spaciously distributed, enabling the operator to work and perform maintenance tasks with great ease.

The maximum free-standing height of the LCL700 is 69.8metres on anchor feet. The LCL700 tower sections, with a 2.5m-wide frame, are the same as for the luffing-jib LCL500 model and the flat-top 21LC750. This eliminates the need for owners of those models to re-invest in tower sections or the climbing cage.

This new luffing jib crane uses a 200kW hoist motor that enables reaches high speeds of up to 134m per minute for the LCL700 64t, and 170m/min for the LCL700 50t. The hoist speed with maximum load capacity is naturally reduced but remains extremely competitive - the LCL700 64t can lift 64t at a speed of 17m/min or 32t at 34 m/min, while the maximum speed for the 50t version is 22 m/min when lifting 50t loads and 43 m/min when lifting 25t loads.

 Both models feature a high-capacity Lebus hoist cable drum, enabling them to be used to construct buildings of over 1000m in height when using the single pull line, and buildings of over 500m in height when using the double line.

Of the many advantages of this new model, perhaps the most striking is its ease of assembly. The LCL700 leaves the factory ready for quick assembly with pre-assembled luffing reevings, thus allowing on-site erectors to work faster and the assembly time to be reduced. The components can be quickly connected using bolts, the accesses are wide, comfortable and easily-assembled, and the erection weights have been optimised. The heaviest weight for a quick crane assembly would be 18.5t and can be reduced to 13t by removing some of the components pre-assembled at the factory and lifting them separately.

The new model will be available worldwide from March and it will be showcased at Conexpo-CON/AGG in Las Vegas from March 7-11.