HIGH-RISE CONSTRUCTION Ӏ SECTOR REPORT


ToWERING ABovE


High-rise buildings need high-rise cranes. Julian Champkin looks at flat-tops and new designs of luffers. The Wolff 6523 Clear is a 224 tonne capacity flat-top tower crane


Tower cranes are, on the face of it, a mature design; today's hammerheads and flat-tops look much the same in outline as those of 20 years ago. After all, if you are lifting a load up a high-rise, how can you improve on a vertical tower with a horizontal jib sticking out of the top? But technology has advanced – digital technology especially – and is applied to new tower cranes as to other types. Some new models have intelligent control systems; some are additions to manufacturers’ ranges; one or two are just, well, bigger. We start with Wolffkran, who added a new model this summer. The Wolff 6523 Clear is a flat-top in the 224 tonne class. It is based on Wolffkran’s 6031 Clear, one of the company’s best-selling cranes, but comes with a newly designed and patented jib.


34 CRANES TODAY


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