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While in Japan the era of these giant machines is linked with the massive suspension bridge construction programme of the 1980s and ’90s, in Europe boiler house construction in the 1970s led to the development of special roof-mounted slewing cranes like the Liebherr 350L/ 450 with a maximum capacity of 24t at 13.5m. Heavylift units with a load moment of up to 3,500tm built by Kitagawa and Sanuki Iron Works are suitable for heavy steel erection work like boiler house construction at power plants or bridge construction. Most Japanese tower crane manufacturers like IUK (formerly IHI), Hitachi,Ogawa, Kitagawa, Koshihara and Sanoyas provide an extensive range of these so-called ‘universal cranes’. Smaller units are mounted on a cruciform base, a limited crane tower or a travelling undercarriage, and they are mainly used as assist cranes on large construction projects or as recovery cranes to dismantle large internal tower cranes. Specially designed pedestal luffing jib cranes, in most cases travelling on rail or skidding devices over a girder framework. The higher the building, the more tower sections can be saved.Ĥ. Instead of a crane tied to the building under construction, there is no interference with the building’s front erection sequence. However, nearly any other standard tower crane can be converted into a versatile roof-mounted version, as long as the corner loads can be transferred into the building.
#ROOF CRANE LIFT SERIES#
Internationally well-known are the TG (Tower Gantry) series operated by Cornell and Jake’s in North America. Depending on the crane size, up to 2,000tm has so far been achieved. The maximum load moment is comparable with that of tower cranes in the manufacturers’ standard product range. Standard tower cranes, mainly top slewing luffing jib cranes, rigged on limited crane towers or even with not tower sections but instead mounted on a special base frame connected to the roof by anchor screws.
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Typical examples are the Sheedy 30 US ton (27t) and 50 US ton (45t) crane,Wilbert’s 35tm Wolff 30A recovery crane and the 140tm Favco 240R operated by LCR Lindores.ģ. Either built or modified in-house, they incorporate the extensive experience of the operating company. Generally these cranes are specialised hoisting equipment belonging to crane rental and rigging companies. Stiff leg derricks and modular lattice boom jib cranes made up of lightweight compact crane components up to a load moment of 220tm. For this special application, Kobelco dramatically modified its standard crawler crane uppers.Ģ. Therefore, since the 1980s it has been only a niche market, demonstrated by bridge pylon mounted versions for cable erection in suspension bridge projects. Although this lifting equipment seems to be a simple solution, the heavy rigging weights of the crane components are an obvious disadvantage. In North America Manitowoc, American and P&H crawler crane uppers were used in this way as original successors of the derrick cranes in heavy steel construction. Depending on the specific job site, maximum load moment generally varies between 50tm and 340tm. Depending on the required under-hook height of this ‘pedestal crane’, special reeving or dual hoist winches may be required. Conventional mobile lattice boom crane uppers mounted on purpose-built adapter frames connected to thesupporting roof. When discussing the special design features and the market prospects of roof-mounted cranes, one can identify five distinct categories:ġ. However, when topping out the tall building, a roof-mounted lifting device may be the only choice for bringing down the climbing tower crane. Since the middle of the last century more and more internal climbing tower cranes took over their job with considerable savings in construction time. For example the typical skyscraper construction of the early 20th century relied on derricks based on the inner steel structure of the buildings. In the history of high-rise construction the idea of putting the lifting equipment on top of the structure under construction has a long tradition.
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Heinz-Gert Kessel reports on the various types of cranes that can be roof-mounted and on several projects that have benefited Mounting a crane directly onto the roof of a building can have great advantages.