New NC-B 12-70 demonstrates its strength in Saudi Arabia
Just one look from above is enough to see the biggest challenge presented by the construction site in Medina: there鈥檚 not a lot of space. High-traffic roads and tall neighbouring buildings required crane operations to be planned with precision, something which Liebherr Tower Crane Solutions closely supported.
With its maximum jib length of 70 metres and a lifting capacity of up to 12 tonnes, the NC-B 12-70 is reliable, economic, and safe in its work. In addition, the tower crane also offers a jib head load capacity of 2,000 kg at maximum jib. These technical features make the crane an optimal solution for high-performance lifts in densely built-up metropolitan areas.
It was Liebherr鈥檚 professional approach and fast execution of measures that impressed customer 鈥淢OBCO for Construction and Civil Works鈥�, whose latest building project, the 鈥淪afiyyah Museum and Park鈥� is underway in the centre of Medina. A museum, shops, caf茅s, and a public garden complete with palm trees will move in following completion.
Optimised for transport and assembly
The NC-B concept is optimised for transport and assembly. Five trucks deliver all elements of the slewing part with 70 m jib length to site quickly and easily. Standard-sized containers can be used for transport. Once on site, assembly is straightforward. The central unit with slewing platform and connection element only requires one lift. A weight reduction of the central unit is also possible: If needed, the slewing platform, control cabinet and cabin can be installed separately to meet the assembly crane鈥檚 performance capacity.
Established technologies from Liebherr鈥檚 existing Flat-Top series further accelerate assembly. The LiConnect quick connection system enables the jib to be assembled quickly and safely in five-metre sections.
16 EC 240 and 21 HC 290 tower systems: the perfect match
Both 16 EC 240 and 21 HC 290 tower systems are compatible with the NC-B 12-70, whereby the 16 EC tower system, measuring 1.6 x 1.6 metres, has been specifically designed for use with the NC-B series. Pin connections ensure the 16 EC 240 system鈥檚 straightforward, economical assembly. The tower sections have a standard length of 3.9 metres, which enables climbing on the building. Longer tower sections of 11.7 metres can also be used for efficiently achieving a freestanding hook height of up to 50 metres. Using the 21 HC 290 tower system, the freestanding hook height can be increased up to 77.7 metres.
The hydraulic climbing unit is designed with flexibility in mind; it鈥檚 suitable for both internal and external climbing, completely detachable and compatible with other Liebherr tower cranes. As a result, the operator only needs one device, which can be used on various construction sites.
Assistance systems and accessories increase operational comfort and safety
The hoist gear, slewing gear and trolley are controlled by a frequency converter. This makes stepless acceleration during lifting, lowering and slewing effortless and enables high-precision crane operation. Drive units with frequency converter not only provide excellent handling characteristics, they also minimise the risk of damage to the crane, and flatten occurring power spikes.
The Micromove smart assistance system, which ensures exact positioning of heavy loads, is included in the package as standard. Additional options include the ABB operating range limiting system and the EMS electronic monitoring system with sensors included. Assistance systems provide reliable support for crane operators during lifts and contribute to site safety. An optional slip ring unit also supports safe operation. This allows infinite slewing of the crane on site without the risk of cable breaks.
Liebherr also offers a six-tonne version as part of its NC-B series in the form of the NC-B 6-62. The series is specifically designed to meet the requirements of price-sensitive markets and customers. Short delivery times are available for both series without compromise on in-house technologies?鈥�?thanks to the production site in Pune, India, Liebherr is able to manufacture cranes in the region for the region.
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