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

Crane Geometry

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