New Comansa high capacity flat top4 September 2018 by Sotiris Kanaris
Comansa has expanded its range of high capacity tower cranes with the addition of the 21LC1050 flat-top.
The new model is offered with versions of maximum load of 25, 37.5 and 50t and can be erected with reach of between 30 and 80m with configurations every 5m. In addition, an optional jib configuration is available allowing a special reach of 85m.
“The characteristics of load, reach and mechanisms of the 21LC1050 make this model ideal to offer an optimal result in large industrial or mining projects as well as for the construction of buildings with prefabricated and steel structures of great tonnage,” said Comansa.
The design of the slewing part of the 21LC1050 is similar to that of the 21LC750 and 21LC660 models. Instead of having a cusp element, the jib and counterjib join directly on the slewing part, which allows a much faster and safer assembly. The 21LC1050 also shares a large part of the jib and counterjib sections with the other two models.
Among the novelties presented by the 21LC1050 is the design of its counterjib, which, like the jib, allows numerous different configurations to better adapt to the needs of each job.
“Always having a counterjib radius as short as possible avoids possible interference with buildings or other cranes present in the same project, thus increasing safety,” said Comansa.
The complete structure of counterjib consists of five modular elements that allow up to six different configurations. Thus, when the crane is assembled with a maximum range of 80m, the counterjib radius is 31m, being able to reduce, for example, to 27 when the jib is 50m, or to 21 when the reach is 30m. In addition, the counterjib radius in all its configurations can be reduced by one additional metre with steel counterweights, which are offered as an optional element.
The 21LC1050 is erected on a new tower section of 2.5m in width, compatible with the rest of the mast sections of the same with from Comansa. In fact, this section, called D36B, will become the standard of other Comansa models with similar sections, such as the 21LC750 or the LCL700 luffer. In its version with fixing angles, the 21LC1050 reaches a freestanding height of 73.3m, exceeding 98m when combined with other sections of the larger width from Comansa.
The hoist cable of the 21LC1050 is compacted and only 20mm in diameter, which allows all hoist mechanisms to have drums with high rope capacity. The standard mechanism, 65 kW, has capacity for 720m of wire rope and reaches speeds of up to 166m/min in the versions of 25 and 37.5t, and 83m/min in the 50t version. For projects in which it is necessary to reach higher speeds (up to 300m per minute), two optional mechanisms are also available, of 110 and 132kW respectively, as well as the possibility of issuing with Lebus drums with capacity for 1,570m of rope.
Like the rest of Comansa's flat-top models, the 21LC1050 comes standard with the PowerLift system, which allows the crane to improve the load diagram by 10%, always without exceeding the nominal capacity.
The climbing cage J3-20 is also new. This hydraulic cage is compatible with other models from Comansa, like the LCL700 luffing-jib crane, and has a pushing force of 200t, greater than any other jacking cage for 2.5m-wide mast sections from the manufacturer. The 21LC1050 comes standard with the new CUBE cab in its XL version.