| Construction
can lift its full 50 t. The same maximum capacity is also available between 3.5 – 16.8m when the jib is built to 80m, or from 3.5 – 25.2m when the jib is 30m in length. Many customers will also appreciate the option of configuring the crane with the 45m jib, which delivers a hefty 24.8 t maximum capacity at the jib end. These heavy payloads are supported with counterjib options of 15m for jib configurations of up to 45m; 17.5m for jib configurations of up to 55m; and 20m when working with jibs from 60 to 80m. This versatility aids the crane’s ability to work in proximity to other cranes or nearby structures. Over 1070m of rope is available on the drum and the crane’s payload is efficiently transported horizontally, thanks to the smooth and precise frequency drives of Potain’s 25 DVFC 25 trolley. Slewing speeds are set at between 0 - 0.7 rpm via the RVF 174 Optima+ system. The K850 mast, with its 2.45m x 2.45m sections, enables a freestanding height under hook of up to 69.7m. At the top is the V140S Vision cabin where the operator has a clear view, aided by tinted glass, windshield wipers, and a sun visor. Heating comes as standard and air conditioning is available as an option for added comfort. The entire top-slewing section can be delivered to the jobsite in as few as 11 trucks, offering a surprising ease of transportability for such a large crane, said Manitowoc. “As topless tower cranes continue to increase in
popularity, we are quickly responding to the demands of our customers in Asia-Pacific for higher-capacity models,” said Leong Kwong-Joon, regional product manager for tower cranes at Manitowoc. “Topless tower cranes are ideal for large infrastructure projects or modular developments, plus a host of other applications – and with the Potain MCT 1005 M50 we’ve created a model with a vast range of jib lengths and capacities that is capable of meeting almost every task demanded of it.” The MCT 1005 M50 arrives on the market just over six months after the launch of the Potain MCT 805, which was previously the largest Zhangjiagang-produced topless Potain crane when it launched in April 2022.
Tough guy
Liebherr has announced is expanding its EC-B series upwards with the 520 EC-B 20 Fibre, the largest addition to the “Tough Guys” series. The new flat-top crane with fibre rope and a lifting capacity of up to 20 tonnes was shown for first time at the construction machinery trade fair Bauma in Munich back in October. Machines with such enormous lifting capacities are in demand as more and more construction sites are using heavy prefabricated concrete components. With a maximum jib length of 83m, the 520 EC-B
20 Fibre is capable of lifting as much as 2900kg at the jib head and comes equipped with a connection for the 24 HC 420 and 24 HC 630 tower systems. A freestanding hook height of up to approximately 96m is also possible. The jib can be flexibly adjusted in 2.5m increments depending on site requirements. “We have had so many positive results with our EC-B series since introducing our fibre rope technology. We’re really happy to be expanding the EC-B series upwards with the help of a new rope diameter,“ said Markus Kinateder, Product Manager, Liebherr-Werk Biberach GmbH. The fibre rope for the 520 EC-B 20 Fibre measures 25mm in diameter (already available versions measure 20 and 22mm). The development process focused on assembly
www.waterpowermagazine.com | February 2023 | 45
and transport as well as performance in order to meet all the demands faced by a modern crane fleet. A clever assembly concept, including quick assembly connections and a compact head, makes the crane easy to set up, said Liebherr. Only five transport units are needed to deliver the slewing section and jib, including counter-ballast, to the site in question. This saves both time and costs and also helps to reduce emissions. EC-B series cranes particularly prove their worth on construction sites where multiple machines are in use at the same time. Their flat-top design enables them to turn above each other without encountering problems, to ensure safe working. The climbable cranes with ergonomic LiCAB cabin, feature intelligent assistance systems that support the crane operator according to the requirements of the job at hand. New to the market as of this year are the 470 EC-B, available as 20 and 16 tonne models, the 370 EC-B 16 Fibre, the 300 EC-B 12 Fibre and the 270 EC-B 12.
Fibre rope advantages at a glance The high-tensile fibre rope, which is the result of 10
years of development work by Liebherr and the rope manufacturer Teufelberger, is a groundbreaking technology. Fibre cranes achieve significantly higher performance values compared to their steel rope counterparts. The fibre rope is more durable, easier to handle when reeving due to its lighter weight, and maintenance is less complicated as lubrication isn’t required. And on top of all that, operational safety is also increased; crane operators are able to see at a glance when the fibre rope needs replacing. The components of the rope’s cover wear out at different rates – a red layer indicates that the rope has reached the end of its service life. ●
Above: Manitowoc has launched its largest topless tower crane in China – the MCT 1005 M50
Below: Liebherr has expanded its EC-B series upwards with the 520 EC-B 20 Fibre
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