TOWER CRANES Ӏ SECTOR REPORT
j with modular building you can potentially do a floor a week and as the building grows it allows you to bring in the follow-on trades in sooner because each floor is watertight as soon as it is in place. So all of a sudden your construction programme is greatly reduced and you are making a saving. “Our clients and others in the building industry are seeing the benefits in that already. We are involved with Mace in a couple of projects which part traditional RC frame and part modular, and also with Bouygues, who have luffing jib cranes which again will be for modular use; so I think that is the future really.” An example of just what he was talking about could be seen late last year in New Victoria in Manchester, where a Wolff 166B
26 CRANES TODAY
Jaso has entered the flat-top market
and – a first for the UK – a Wolff 235B, both luffers and both owned by Mayo Engineering, began working together on two skyline-altering tower blocks, one 20 storeys high, the other 25 storeys, which will provide 520 new homes on top of ground- floor retail and leisure outlets and other public areas. It was a requirement that the 235 B be free-standing, so as not to slow down construction. It stands 98m tall, with a 45 m jib, and has no tie-ins. The 166 B, also with a 45m jib, stands just a little lower at 83.2 m. To make this happen, eight 3
x 3m TV 33 tower elements on foundation anchors were used at the base of the 235B crane. It was erected to its final tower height using a 500-tonne mobile crane with a 63 m luffing jib
attached to its main boom. Tower cranes come in basically three variants: the hammerhead, the luffer and the flat-top. There is also the hammerhead-flat-top hybrid the low-top. Jaso have long been known for their low-tops; last year they added flat-tops to their model range. The J200.12 has 12 tonnes capacity and the J200.10 is a 10 tonne machine. Booms on both models start at 30m and can be increased in 2.5m increments up to 67.5m. “We are known as pioneers
of the low-top. Flat-tops are a departure for us,” says Dick Huitema of Jaso Tower Cranes. “But we walk with our customers and the demand was there. We had been concentrating on the higher-capacity end of the tower market. People do make high- f
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