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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) 990 Erection Fig. 33.8 Crawler crane (courtesy of Baldwin Industrial Services/Chapman Brown Photography) crawler crane use can be justified. The real advantage of a crawler crane is that both its weight and the reaction from the load-lift are spread more widely by its tracks. However, it does not have the added stability of a truck-mounted crane with its outriggers set (Fig. 33.9). Most types of mobile crane form part of the erection fleet owned by steel erection and/or plant hire companies. The decision to hire from a plant hire company is often determined by the geography of the site, i.e. is the site close to a plant hire company’s yard, or is it close to the contractor’s own plant depot? Is the crane to be used for short or long duration? Is the lift for which the crane is required one of a series or simply a one-off? Mobile crane capacity normally ranges between 15 and 800 tonnes. Figures 33.9 and 33.10 provide performance data for a typical 25 and 800 tonne crane. It is important to note that the rated capacity of a mobile crane and the load which can be safely lifted are two very different things. The maker’s safe loading diagram for the crane must always be carefully consulted to see what load can be lifted with the jib length and the radius proposed. It is essential that a mobile crane is used on level ground so that no side loads are imposed on the jib structure.
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) 25 Tonne DEMAG AC 75 "CITY CLASS" Mobile Crane Lifting Capacities Main Boom Extension Telescopic Boom 20,7 - 25,0 m. On Fully Extended Outriggers 5,9 m. Working Range 360° Radius m Main Bnnm 20,7 ni Main Bnnm 25,0 m 7,1 m 13.Om 7,1 m 13.Om 0' 30' 0' 30' 0' 30' 0' 30' Rudiun m 5 6 7 8 9 10 11 12 13 5.6 5,6 5,3 5,0 4.7 4,4 42 40 35 - - - - 3,7 3,6 3,5 3,4 3,3 - - 2,2 2,2 22 21 2,1 2,0 1.5 - - - - - - - - i,7 - - 4,5 4,4 4,2 4,0 3,9 3,7 3.5 - - - - - 3,4 3,3 3.2 3.1 - - - 2,0 2,0 2,0 2,0 1,6 1,9 - - - - - - - ' 5 6 7 d I 10 11 12 13 14 3,1 3,2 1,9 1,6 3,0 3,0 1,6 1.5 14 15 2,7 0,0 1,6 1,6 2,7 2,9 1,6 1,5 15 16 2,4 2,6 1,7 1,5 2,4 2,6 1,7 1,5 16 17 2,2 2,3 1,6 1,5 2,1 2,3 1.7 1,4 17 18 1,9 2,1 1,6 1,4 1,6 2,0 1,6 1,4 16 19 1,7 1.6 1,5 1,4 1,6 1,6 1,6 1,4 19 -— 20 1,5 1,5 1,4 1,4 1,4 1,6 1,5 1,3 20 21 22 23 24 — 25 26 27 28 1,3 1,1 0,9 0,6 0,7 - - - 1,3 ' - - - ' 1,4 1,3 1,1 1.0 0.9 0,6 0,7 0,6 1,3 1,3 1,3 1,2 1,0 0,9 07 - 1,3 1,1 0,9 0,8 0,7 0,6' 0,6 - 1,4 1,2 1,0 0,9 0,7 - - ' 1,3 1,2 1,0 0,9 0,8 0,7 0,6 0,5 1,3 1,3 1,3 1,2 1,0 0,9 0,8 0,7 21 22 23 28 26 27 28 , 29 - - 0.5 - - - - 0,6 29 25 Tonne DEMAG AC 75 "CITY CLASS" Mobile Crane Dimensions Fig. 33.9 Typical mobile crane (courtesy of Baldwin Industrial Services) Cranes and craneage 991
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