TOWER CRANES Ӏ SECTOR REPORT
j of their site, they have a maintenance package with us that includes erection so we will send our own 250 t or 300 t Grove all-terrain crane to put it up and take it down for them, and the arrangement works well
Comansa goes ship-building
Comansa have built a bespoke tower crane for a ship- building yard in Norway. The company’s 21LC1050 has been working at the Aibel yard near Haugesund on the North Sea for just over a year. Tower cranes for shipyards must meet stricter
requirements than those for normal construction projects. They are close to the sea with salt-spray and bad weather; vehicles and people swarm all over such sites; and they are used for many different lifting tasks rather than repetitiously for a single type of load. Comansa’s 50 t capacity crane had therefore had to undergo a detailed customisation process to adapt it to the customer’s needs. To withstand the 400 tonnes force per corner that
originate from a crane of more than 90 metres in a D25 wind zone, and to allow worker and vehicle transit around it, Comansa built a reinforced 10 metres portal, movable on rails, which was assembled by its Norwegian distributor in the yard. Special protection elements and 250-micron paint protect it from corrosion; the counterweights are protected with galvanised steel frames. The electrical cabinet is of stainless steel, and there is a wind-release system which can be activated from the base of the crane.
The 21LC1050 is a flat-top; installation in the small 600-700 square metre and windy space of the Norwegian yard gave logistical challenges. The yard itself lent its facilities and helped to pre-assemble the parts, which arrived in 32 lorries. A 500-tonne mobile crane with a height of 115 metres was used. The heaviest piece to assemble was 23 tonnes. Since assembly the crane has worked on constructing the Johan Sverdrup Phase 2 offshore oil process platform, the yard’s largest project to date, and had been used to lift very different loads 24 hours a day, seven days a week. Its 80 metre boom can cover every part of the platform.
for them and for us. “One of my biggest ambitions at the moment is to promote our free-standing height. We have developed the TV60 section, and when you use that with the likes of the Wolffkran 355B, which is
another luffing-jib crane heavily used in the UK, we can achieve a free-standing height of 150 metres. That reduces tying-in. Clients in the UK are pushing towards modular building, and if you don’t have to tie in then f
24 CRANES TODAY
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