Cranes

BY
BINEET MAURYA AND AJITA PANDEY

1. BINEET KUMAR AJITA PANDEY

2. CRANES a large, tall machine used for moving heavy objects by suspending them from a projecting arm or beam synonyms: derrick ,  winch ,  hoist ,  davit ,  windlass ,  tackle ,  block and tackle , It is classified two types 1 . Mobile crane 2 . Tower crane

3. Mobile crane Which is movable from its place Mobile cranes are different type according to use 1 . crawler crane - full revolving superstructure , mounted on a pair of continuous parallel track . Good travel capability around the job site . Provide large contact area to the ground . Before hoisting machine should be levelled and ground settlement considered . The distance b/w crawler tracks affects stability and capacity

4. Maximum boom length 100 to 400 feet Maximum fly jib length 30 to 120 feet Maximum radius ( boom only) 80 to 300 feet Maximum lifting capacity 30 to 600 tons Maximum travel speed 50 to 100 ft/min

5. Telescopic - boom truck mounted crane – Truck crnes that have a self contained telescopic boom . Can travel on public highways . Higher initial cost per rated capacity . Max boom length 70 to 170 ft . Max radius 60 to 140 ft . Min radius 10 ft . Max lifting capacity 20 to 120 tons

6. All terrain canes Capable of long distance highway travel It have dual cabs Lower cab – highway travel Super structure cab – drive and crane crane control It has both job site mobility and transit capability It has higher cost in compare to other crane

7. Max boom length 100 to 270 ft Max radius 70 to 250 ft min radius 8 to 10 ft Max lifting capacity 30 to 300 tons and up to 800 tons for larger machines Max travel speed 40 to 55 mph

8. Tower crane High lifting height and good working radius Taking up very limited area Two types of crane are there – 1 .Fixed base tower crane 2 . Travelling tower crane

9. Mobile based tower crane

10. Selective criteria Weight ,dimension , and lift redii Max free standing height Max braced height of crane Weight of crane supported by structure Available head room Area that must be reached Hoist speed of the crane Length of the cable the hoist drum can carry