Tower crane manufacturer Comansa has expanded its 21LC series of flat top cranes by adding two new models with load capacities that are on average 16% and 23% higher respectively over the existing 21LC550 model from which they have evolved.
The new 21LC600 and 21LC650 models offer maximum load capacities of 20t and 25t and can be assembled with ranges of between 30-80m with configurations every 5m, allowing a maximum point load of up to 4.95t. Both models also incorporate an optional boom configuration that allows the total range to be extended to 85m at the tip.
A statement from Comansa said that the first of the new features in these models is that they have a shorter, modular counter-jib, ranging from 24.4-16.4m and having up to five possible configurations. This concept has a precedent in Comansa’s 21LC750, 21LC1050 and 21LC1400 models, and offers greater adaptation to work configuration in reduced spaces.
Comansa said that another strong point of these models is the improved access to the turntable and the rotating part: the cathead has been redesigned to facilitate the passage of lifting cables, including a welded ladder that allows access to the highest part without the need for the cab platform.
Access to the cab platform is now direct via the turntable, thanks to the folding ladder, preventing falls while working on the upper level and also being easier to transport.
As a standard feature, both crane models offer the double trolley system with automatic changeover (called DT in the data sheets), and incorporate, as a novelty, the optional availability of single trolley (ST) which simplifies maintenance work while increasing load capacity in short boom lengths.
The height, which is self-supporting with a built-in base, can reach up to 85.8m. Also, the tower sections are 2.5 square metres for both models, said the Spanish tower crane specialist.
Taking advantage of the launch of the new cranes, Comansa has also presented a new climbing cage, the J3A-11, which follows the concept of the brand’s earlier J3-20, with greater length and distance between rollers, a saving in scale recovery time, thanks to the auxiliary hoist included, which can also be transported in standard containers or trucks.
With regard to the lift engines, the standard for the 20t versions is 50 kW, while for the 25t version it is 65kW.
A 110kW engine is optional for both versions, with a speed of up to 290m/min and maximum capacities of 1,570m of cable. The Effi-Plus technology, fitted as standard, significantly increases lifting and lowering speeds for light loads, shortening working cycles without increasing power or consumption.
Comansa added that the modularity, which is an inherent quality of its cranes, allows certain boom sections to be interchangeable within the 21LC-crane series, which enables rental companies to reduce their stock, optimising their investments, as they can order these new cranes with a shorter boom length if they have previous cranes of the same series in stock.
Both models come as standard with Comansa’s CUBE cab in its L version, with the XL available as an option. The company says the cab is a cutting-edge design that is safer, more comfortable and provides operators with total visibility of the load and workspace, so they can carry out operations more easily, thanks to the digital control technology incorporated.
Assembly of the new models is also easier, faster and safer, providing a longer life for the structure, says Comansa, adding that the 21LC600 and 21LC650 flat-top tower cranes can be used for the construction of residential and commercial buildings, as well as power plants, mining, bridges and other high-commitment infrastructure.