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Crane Modeling using Excel Please make sure your computer can play sounds. You should currently hear a sound instructing you what to do next.

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Presentation on theme: "Crane Modeling using Excel Please make sure your computer can play sounds. You should currently hear a sound instructing you what to do next."— Presentation transcript:

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2 Crane Modeling using Excel Please make sure your computer can play sounds. You should currently hear a sound instructing you what to do next.

3 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.

4 Types of Cranes MOBIL CRANES (CRAWLER or WHEEL MOUNT) TOWER CRANES

5 Mobil Crane Nomenclature Mast Boom Rig Counter weight Outriggers

6 Counterweight jib Cab Counterweight Tower (mast) Trolley Tower Crane Nomenclature Load jib

7 Luffing jib Tower Crane configurations Saddle jib / hammerhead boom

8 Details of Tower Cranes

9 HOOK BLOCK HEIGHT

10 SAFETY OSHA Crane fatality data: Energized power lines50% Overturning19% Load dropped14% Boom collapsed12% Two-block 5%

11 Crane Accidents : 61.0% Overturning

12 Crane Geometry

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14 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

15 Over the front (front lifting) C L

16 Over the rear (Rear lifting) C L

17 C L Over the side

18 Crane Geometry Counterweight C Payload P ba Tipping Moment TM= P x a Stabilizing Moment SM = C x b TM = SM / safety_factor


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