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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 Rig Counter weight Outriggers
Counterweight jib Cab Counterweight Tower (mast) Trolley Tower Crane Nomenclature Load jib
Luffing jib Tower Crane configurations Saddle jib / hammerhead boom
Details of Tower Cranes
HOOK BLOCK HEIGHT
SAFETY OSHA Crane fatality data: Energized power lines50% Overturning19% Load dropped14% Boom collapsed12% Two-block 5%
Crane Accidents : 61.0% Overturning
Counterweight C Payload P ba 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) C L
Over the rear (Rear lifting) C L
C L Over the side
Crane Geometry Counterweight C Payload P ba Tipping Moment TM= P x a Stabilizing Moment SM = C x b TM = SM / safety_factor
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 17 Cranes.
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Struck-By Hazards. Crane Tip Over and Failure Incidents Soft Ground Inadequate outrigger support Overload Crane out of level Boom strike.
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MNM Fatal Machinery Accident Machinery Accident February 19, 2009 (Puerto Rico) February 19, 2009 (Puerto Rico) Crushed Stone Operation Crushed.
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