Tower cranes final edit
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Tower cranes are used in high-rise construction and can be fixed or mobile. Fixed tower cranes have a fixed tower and extendable outriggers for stability, while climbing cranes use hydraulic jacks or winches to raise their towers. Cranes have horizontal jibs or saddles to lift loads, with trolleys to move loads along the jib. Jibs can be stationary or luffing. Crane operation involves raising and lowering loads with the hoist, and moving loads horizontally with the trolley and slewing unit. Safety is critical as crane accidents have caused many deaths in the construction industry.
Tower cranes final edit
- 1. Tower cranes hoisting tackle pulleys
- 4. high rise construction low rise work crawler
- 6. rail mounted TC extendable outriggers machine stability sensitive
- 8. Climbing crane hydraulic jacks or TC winches
- 10. Free standing crane - - TC Track
- 11. track Horizontal jib or saddle crane - jib jib trolley jib Luffing jib -
- 12. jib jib jib Trolley or saddle jib mast load radius diagram load radius diagram
- 13. over turning
- 14. counter weight counter balance T.C TC Mast = tower TC TC
- 16. Hook
- 17. slewing trolley Start to start with raising the weight Derricking trolley Slewing Lowering the Hook on Raising load the load load Travelling Derricking Unhook Lowering the load load slewing unit Slewing ring at the base of tower
- 18. - Slewing ring at the top of the tower TC
- 20. 60 50 No. of deaths 40 30 20 10 0 92 93 94 95 96 97 98 99 2000 2001 2002 2003 2004 2005 2006 Year of incident Overhead power line electrocutions Struck by crane loads Crane collapses Cause Struck by crane booms/jibs* Falls** Struck by cranes or crane parts Caught in/between Other causes*** 0% 5% 10% 15% 20% 25% 30% % of deaths
- 21. TC
- 24. TC TC
- 30. TC TC
- 32. Prepared by Eng.: Haytham Baraka Fourth year civil engineering Zagazig University E-mail:haytham.baraka@eng.zu.edu.eg 2012