Crane Modeling
using Excel
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CON 243 Heavy Construction Equipment,
Methods, and Materials
Lecture 25 (Chap. 17) — Cranes
The crane is the primary machine used for the vertical movement of construction materials.
Types of Cranes
MOBIL CRANES (CRAWLER or
WHEEL MOUNT)
TOWER CRANES
Mobil Crane Nomenclature
Mast
Boom
RigCounter weight Outriggers
Counterweight jib
CabCounterweight
Tower (mast)
Trolley
Tower Crane Nomenclature
Load jib
Luffing jib
Tower Crane configurations
Saddle jib /hammerhead boom
Details of Tower Cranes
http://www.towercrane.com/tower_cranes_Detail_Select.htm
SAFETYOSHA Crane fatality data:
• Energized power lines 50%• Overturning 19%• Load dropped 14%• Boom collapsed 12%• Two-block 5%
Crane Accidents:• 61.0% Overturning
Crane Geometry
CounterweightC Payload
Pb a
Tipping Moment TM= P x a
Stabilizing Moment SM = C x b
For stability: TM << SM
SM is constant for a given position of the platform
Over the front(front lifting)
CL
Over the rear(Rear lifting)
CL
CL
Over the side
Over the side
Crane Geometry
CounterweightC Payload
Pb a
Tipping Moment TM= P x a
Stabilizing Moment SM = C x b
TM = SM / safety_factor