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 http://www.towercrane.com/tower_cranes_Detail_Select.htm

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

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