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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 994 Erection 12 500 kg L I 35.0 m III V VI X L5=55.Om III IV V X /\A/\/\J\/\\/\V\7\J\/'\ L450.Om 3600 kg V X /\J\/\/\/\/\J/\/\/\/\(\ L345.Om III IVX /\/V\/\/\/W\/ L2.40.Om III X /\A/\/V'\ Fig. 33.11 Tower crane (courtesy of Delta Tower Cranes) Cranes for the stockyard 6300 kg 300 kg 4 400 kg 2900 kg Stockyard cranes have to work hard. The tonnage per job has to be handled twice in the same period of time, often with many fewer cranes. It is therefore important that cranes be selected and cited carefully to ensure maximum efficiency. 33.8.3 Other solutions If there is no suitable crane, or if there is no working place around or inside the building where a crane may be placed, then consideration must be given to a special mounting device for a standard crane, or even a special lifting device to do the work of a crane, designed to be supported on the growing structure under construction. In either event, close collaboration between the designer and erector members of
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) Cranes and craneage 995 I_! I' 111111 II — Fig. 33.12 Citigroup Tower, London showing tower cranes tied into the building (courtesy of Victor-Buyck Hollandia) the management team is of paramount importance. Conversely, inadequate communication may prove problematic. Once the decision to consider the use of a special lifting device has been made, a new range of options becomes available. The most important of these is the possibility of sub-assembling larger and heavier components, thereby reducing the number of labour hours worked at height. This is particularly true in the case of bridgework, where substantial sums would otherwise have to be expended on other temporary supports and stiffening. A major disadvantage of special lifting devices is that the apparatus being considered is often so specialized that is unlikely to be of use on another job. Thus
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