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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) 1002 Erection clench and unclench fingers to signal take the strain signal with one hand other hand on head JIB UP JIB DOWN DERRICKING JIB clench and unclench fingers to signal inch the load signal with both hands TRAVEL TO ME TRAVEL FROM ME HOIST LOWER SLEW LEFT SLEW RIGHT EXTEND JIB RETRACT JIB TELESCOPING JIB TROLLEY OUT TROLLEY IN HORIZONTAL JIB Fig. 33.18 Standard hand signals for lifting STOP EMERGENCY STOP
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) 33.9.2 Risk assessment Safety 1003 Identification of foreseeable risk should be carried out 5 , as shown in Fig. 33.19, required before the start of work on site. These should be categorized into likelihood of occurrence (probability) and severity of occurrence (impact). By carrying out a risk assessment, the risks can be identified and, where appropriate, avoided and reduced. However, by its very nature, the erection of a structural frame is a process involving a certain amount of risk. The work is carried out at height, and until it has progressed to a certain point there is nothing to which a safe working platform can be attached. The process of erecting a safe platform can be as hazardous as the erection process itself. One solution is to provide mobile access equipment if ground conditions permit. Different access platforms are appropriate in different circumstances. One advantage of modern composite floor construction is that the decking can quickly provide a safe working platform, requiring only the addition of a handrail. Figure 33.20 shows a safe platform for the erection of bare steelwork – a prefabricated platform slung over a convenient beam. In this case weather protection may be added for site welding. It is the responsibility of the designers and planners to ensure that no platforms are erected in order to carry out work that ought to have been done either in the fabrication shops or on the ground before the component concerned was lifted into place. A key planning-stage consideration is to see if the need for a working platform can be eliminated altogether, i.e. can the operation be carried out at ground level before the component is erected? If not, can the platform be designed so that it is assembled on the component while it is still on the ground? It is impractical to have to consider the provision of a safe working platform in order to be able to safely erect the main safe working platform. The object of safety procedures is to ensure that everything possible is done to eliminate the risk of an on-site accidents. Methods of achieving safety include: (1) An enhanced communication process Communication of the details of safety procedures to all concerned, the display of abstracts of the regulations themselves, the issuing of safety procedure documents, and the running of training courses all contribute to safe working practice. Individuals must be aware of the location of particularly hazardous Risk Likelihood of occurrence Likely severity High Certain or near certain to occur Fatality, major injury, long-term disability Medium Reasonably likely to occur Injury or illness causing short-term disability Low Rarely or never occur Other injury or illness Fig. 33.19 Risk chart 5
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