SECTOR REPORT Ӏ TOWER CRANES
j capacity flat-tops, but they have to be massive, and they take up high volume, so transporting them and assembling them is a problem. If you think of things like ease of transport and ease of assembly there comes a point where flat-top and low-top swap places; we consider that that happens at about 350 tonne- metre class. A flat-top will always
be heavier than a low-top but below that size the difference is not critical. Above that size the height differences between low-tops and flat-tops are only about a metre, which again is not important. Indeed our biggest low-top, the 1400, is actually lower than our competitors’ flat- tops of that capacity, which is relevant for over-sailing when you
have several cranes on one site. “So flat-tops are well-suited to the sub-350 tm capacity class, and demand for that class is there, and the market has been getting bigger and bigger.” So Jaso are now building
flat-tops as well as low-tops; and the market for flat-tops is rising almost as quickly as their towers.
Yongmao tower cranes are currently the Largest in the gulf states The Dubai Waste-to-Energy plant, under construction as a PPP in the United Arab Emirates, is using the largest tower cranes that are currently erected in the Gulf States. The plant will be one of the largest of its kind in the world: on completion it will process 1.9 million tonnes of waste per year to generate 200 MW of sustainable electricity.
The technical and time requirements for the required tower crane were too high for any available local manufacturer, so cranes and
construction specialists NFT Group contacted Yongmao Holdings and the two companies worked closely to make the required customised tower cranes in the short period of time available. Four cranes in all were involved. Two are STL4200 models with 62.5 m jib, 88 m height and 100 t capacity mounted on traveling chassis; two
are STL2400 models with 70 m jib, 74 m high and lifting 80 t on static fixed bases. Manufacture took around six months including shipping. The cranes arrived on site in early March this year. The programme was to install the
tower cranes in 25 days but NFT group managed to reduce that by 50% to complete the installation in record time. The STL 2400 was meant to be installed in 18 days but NFT completed installation in just a week. The much larger, indeed gigantic, STL 4200 was expected to take 25 days to install but the NFT Group managed to reduce that to 12 days. To achieve that result, two fully-dedicated teams supported by a supervisor from the OEM, were working 12 hours a day, safely and simultaneously. While one team was off-loading and assembling, the other team was erecting the assembled parts. Two to three mobile cranes were on site to cater to these simultaneous activities. The cranes have already carried out several lifts of around 90 t. By the end of May 2022, one of the STL4200s will have been dismantled,
relocated and re-installed. NFT group provides the site with monthly preventive maintenance and a dedicated technician on site 24 hours in case of emergency.
CRANES TODAY 29
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