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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) 988 Erection Non Conformance Report Date Project The followine item(s) do not conform to siDecification Option Inspected by Suggested Remedial Action Site Eng Section Clients comments AcceptlReject Authorization Position Signed off Design Eng Fig. 33.7 A typical NCR form 33.8 Cranes and craneage 33.8.1 Introduction DWG. No Date closed NCR No The choice of cranes and positioning may be dependent on many factors. Care needs to be taken to ensure good progress of the work. Often, cranes that work at maximum capacity in restricted areas actually slow production and are not efficient. A well-located crane with spare capacity can speed erection and more than compensate for the additional cost of hire. Principal items to be considered when selecting a crane are: 5 • site location – access and adjacent features • duration of construction
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) • the weight of the pieces to be erected and their position relative to potential crane standing positions • size of piece to be erected • the need for tandem lifts • maximum height of lifts • number of pieces to be erected per week • ground conditions • the need to travel with loads • the need for craneage to be spread over a number of locations • organization of off-loading and stockyard areas • dismantling. On a large job, cranes of varying size and capacity perform various tasks, i.e. a heavy one for the main columns and a smaller one for the side framing posts and angles. The number of pieces to be lifted in any one working period determines the number of cranes required to achieve the desired work-rate. In practice, the choice of crane type and capacity is a compromise, with efforts being made to get as near to the optimum as possible. In order to decide on a crane layout it is necessary to prepare a sketch or drawing of each critical lifting position showing, on a large scale, the position of the crane on the ground; the location of the hook on plan; the clearance between the jib and its load, and between the jib and the existing structure as the piece is being landed in its final position. These drawings will enable a check to be made of the match of each crane to its load; of the ability of the ground beneath the crane to sustain the crane and its load; and of the clearance to lift the component and place it in position. It is important to allow adequate clearance for the tail of the crane as it slews. A series of these drawings will rapidly confirm whether a particular crane is suitable. If there is an anomalous heavy lift in the series, the designer can be asked whether a splice position can be moved to reduce weight. Reports on overturned cranes and crippled jibs bear ample proof of the need to plan and to the extent to which it is neglected. The Code of Practice CP 3010 11 on the Safe Use of Cranes clearly describes the dangers of improper practice. 33.8.2 Types of crane Mobile cranes Cranes and craneage 989 The mobile cranes include truck or wheel-mounted, and tracked cranes. Truckmounted cranes are able to travel on the public roads under their own power and with their jibs shortened. Mobile cranes mounted on crawler tracks (see Fig. 33.8) are not permitted to travel on the road under their own power. A truck-mounted crane may prove a correct choice if a crane is only required on site for a short time since it can come and go relatively easily. However, if a crane is to be on site for a longer period, the high transportation costs associated with
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