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Contractors World International
2012 Vol 3 No 5
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New 21 LC 660 Flat-Top tower crane from ComansaNew 21 LC 660 Flat-Top tower crane from Comansa

Although the latest flat-top from Comansa is designed on the same lines as the 21 LC 750 model but also includes new improvements.

Linden Comansa completes its LC2100 series with the 21 LC 660 tower crane, designed under the EN 14439 European standards, and is available in four versions, depending on the maximum load: 18, 24, 36 and 48 tonnes (39,680; 52,910; 79,360 and 105,820 lbs).

The crane, which goes into production in July 2012, includes the manufacturer’s most recent features, such as the Effi-Plus high speed hoist mechanisms, or the PowerLift system.

Linden Comansa completes its LC2100 series with the 21 LC 660 tower crane  Due to its characteristics, this new model is useful in public works, industrial construction, mining and infrastructures. It also completes the already wide range, as this new crane covers the space between the cranes 21 LC 550 (18 and 24 tonnes) and 21 LC 750 (24, 36 and 48 tonnes).

The 21 LC 750 tower crane, launched in 2009, has been one of Linden Comansa’s most successful models. A similar design has been applied in the 21 LC 660 tower crane, which also does not have an apex element, as the first jib and counterjib sections are assembled together directly over the slewing platform through fast connections. This saves time, reduces costs in auxiliary equipment, and improves the safety.

Both jib and counterjib sections that form the slewing head provides for easier assembly of the crane, and shortens the counterjib by 3 m in comparison to the 21 LC 750. Most of the jib sections of the 660 are the same as the 750, which increases the modularity and the possibilities of section interchangeability between both cranes.

For the tower, a new mast section has been designed, named D35, which is more economic than the 21 LC 750 (D36) tower sectionNew mast section design

For the tower, a new mast section has been designed, named D35, which is more economic than the 21 LC 750 (D36) tower section. However, both have the same dimensions (5.5 m high and 2.5 m wide (18 ft high and 8.2 ft wide), which makes them compatible and able to share the same hydraulic jacking cage. The D35 mast sections can be divided in four panels, are easy to assemble and transport, and are easily joined to other sections by pins.

Two standard tower configurations are available. One uses only D35 tower sections, allowing the crane to achieve a freestanding height of 73.3 meters on fixing angles (240 ft), or 69.9 m (229 ft) on stationary or travelling base.

The second configuration combines D35 with D36 sections, and allows the 21 LC 660 to reach a height of 78.8 m (258 ft) on fixing angles, and 80.9 m (265 ft) on base version. Alternative configurations make it possible for the 21 LC 660 to reach a freestanding height of 124.8 meters (409 ft).

Compatibility is a constant objective with Linden Comansa and the trolley-hook set up of the 21 LC 660 is the same as the 21 LC 550 or the 21 LC 750, depending on the model: the 18 t version of the 21 LC 660 has the set of the 21 LC 550 18 t, and the other three versions use the same set than the three versions of the 21 LC 750: 24, 36 and 48 t.

The new model benefits from Effi-Plus high speed hoist mechanisms, which allow hoist speeds up to 244 meters (800 ft) per minute and the PowerLift System, which improves 10% the load diagram with reduced speeds. The slewing mechanisms drive uses Frequency Control, to make the most of the energy and allowing less consumption.

The standard hoist engine, with 110 kW (148 hp), has a Lebus drum with capacity for 1,450 meters of rope (4,747 ft). Although two other engines, with rope capacity of 790 meters (2,592 ft) and with 110 and 65 kW (87 hp) respectively, are available as options.

Click here for more information >>> Linden Comansa 21 LC 660


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