Tower crane

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Tower crane

  1. 1. WELCOME TOOURPRESENTATIONFARID AFFENDY B. MOHD. FAIZALMOHD. SHAZWAN B. SHERIDANMUHAMMAD RUZAINI B. M. HARONYESSI FAUZIAH BT. MARWANMDM. ROSNAH BT. ABD. RAHMAN (OSH 2213)
  2. 2. INTRODUCTION : TOWERCRANE Tower CRANE is a jib or  Tower cranes often give the boom crane mounted on a best COMBINATION tower structure, of height and lifting demountable or permanent, capacity and are used in including both horizontal and the construction of tall luffing jib types. buildings. Tower cranes are commonly  The construction crew employed in uses the tower crane to CONSTRUCTION LIFT INDUSTRY for the MATERIALS such movement of materials . as steel, concrete, large tools and generators. OCCUPATIONAL SAFETY (OSH
  3. 3. INTRODUCTION :TYPES OF TOWERCRANETower Luffing Jib Crane Hammerhead Tower Crane Self-Erecting Tower Cranes OCCUPATIONAL SAFETY (OSH
  4. 4. INTRODUCTION :ERECTION OF TOWERCRANE OCCUPATIONAL SAFETY (OSH
  5. 5. TOWER CRANE:COMPARTMENT OCCUPATIONAL SAFETY (OSH
  6. 6. TOWER CRANE:COMPARTMENTCOMPARTMENT FUNCTIONBase Bolted to a large concrete pad that supports the craneMast (tower) Connected to the base Give the tower crane its heightOperator’s cab Cab at the top of the tower from which the operator manipulates the crane.Counter jib Metal lattice that supports the ballast.Counter jib ballast Concrete mass attached to the counter jib to balance the weight of the jib and its load. OCCUPATIONAL SAFETY (OSH
  7. 7. TOWER CRANE:COMPARTMENTCOMPARTMENT FUNCTIONMain winch / motors Provide means to lifts the load, along with the control electronics that drive it.Jib tie Metal cable that distributes the tension.Crane runaway Girders along and under which the trolley runs.Jib Metal lattice that pivots on the tower and lifts and extends the hoisting system.Hoisting rope Durable cable of variable length for manipulating loads.Hoisting block System of pulleys that work with the trolley pulley to improve leverage to lift heavy loads. OCCUPATIONAL SAFETY (OSH
  8. 8. TOWER CRANE: HAZARDS HAZARDS ACTIVITYFall from height Carrying out inspection Maintenance Working from suspended platformsSlip, trips and falls Carrying heavy or bulky loads on wet ground.Falling object During carrying and moving loadsElectrocuted Defective installations and equipmentLighting Strike Working during rough weatherHeat Stress Exposed to strong sunlight OCCUPATIONAL SAFETY (OSH
  9. 9. TOWER CRANE: Plan and prepare for lifting Conduct pre-operationalShut down and secure routine checks crane BASIC PROCEDURE Perform the lift Conduct post start up checks Maneuver crane OCCUPATIONAL SAFETY (OSH
  10. 10. TOWER CRANE : BASICPROCEDUREPlan and prepare for liftingSite specific work •Supervisor brief to crane operator, slinger, signallerinstructions and who involve with crane work regarding job task. (load and where to move?)Identify site •Crane will not be operated in unsafe condition.specific hazards •Eg; high voltage lines, excessive temp. , pedestrian traffic.Safety •Safety Helmet – falling objectrequirements •Puncture resistant gloves •Safety glassesAppropriate Load •The weight of the load is correctly estimated in consultation with associated personnel. OCCUPATIONAL SAFETY (OSH
  11. 11. TOWER CRANE : BASICPROCEDURE Conduct pre-operational routine checksPrior to operation, •Operator verify path/direction of crane travelequipment and site area is free from debris/stored equipment and walk the path before load is engaged.Ground/base has been •Authorized personal will inspect the base ofcertified crane and certified if it safe.Counterweights/outrigg •Balance with the load (consult by s/visor)ers and stabilizers •Average tower crane – 20 Tons if load 18 Tons according to verified load plan.Routine pre-operational •Lifting accessories must be safe & thoroughlyequipment checks examined by a competent person every 6 months. OCCUPATIONAL SAFETY (OSH
  12. 12. TOWER CRANE : BASICPROCEDURE Conduct post start up checksOperating radius is •Signaller - relaying the signal from the slinger toclear of obstruction the crane operator. •Directing the safe movement of the crane.Attachments, •Lifting beamsmovements and •Telescoping coil grabscontrol functions •Automatic ingot •Magneting lifiting devices •Slab tongsThe operating, •Operating and emergency controls and safetyemergency controls devices are located and identifiedand safety devices •Correct operation tested in accordance with prescribed procedures.Defects and damage •Inspect slings, shackles, and ropes before andare reported after use. Inform Supervisor. OCCUPATIONAL SAFETY (OSH
  13. 13. TOWER CRANE : BASICPROCEDURE Maneuver craneRadius of loads •Radius is planned to minimize danger to people and facilities in accordance with the plan. •Unbalanced load – unsafe – create additonal strain and stress on crane. •Ensure that people involved in any lifting operationCrane Operators. are competent to carryout their work safely. •Activities are co-ordinated with riggers/doggers OCCUPATIONAL SAFETY (OSH
  14. 14. TOWER CRANE : BASICPROCEDURE Perform the liftLoad •Load well secured and properly balanced in thecharacteristics sling or lifting devices. •Visible to the Crane’s operatorTraffic flow and •Signaller – aware particular care at cross aisles,work area doorways, and other location where pedestriansconditions may step into the path of travel of the crane.Crane controls and •Test all operator pendant controls for safefunctions operation.Monitoring systems •Sound a horn or warning signal – approachingand alarms potential high traffic areas. OCCUPATIONAL SAFETY (OSH
  15. 15. TOWER CRANE : BASICPROCEDURE Shut down and secure crane•Crane is shut down •Crane will stop the operation once in order of supervisor. •Only competence person is allowed.Plant, tools and equipment are • Authorized repair personnel iscleaned, checked, maintained permitted to inspect and maintainand stored according manufacturer’s.Work area has been cleared • Perform housekeeping within the path of travel of the crane.The crane and equipment is • Proper storage and maintenance ofcorrectly stowed and secured all cables, chains, nylon ropes, slings and lifting devices OCCUPATIONAL SAFETY (OSH
  16. 16. TOWER CRANE: ACCIDENTCASE 2011 - A tower crane • September fell onto three residential houses in Georgetown, Penang, Malaysia• Causing fatal to a Chinese man while his family suffer major injuries• Minor damage to a nearby commercial building• The tower crane was used on the site of a new 20 floor hotel on the opposite side of the street from the affected home,• Failure of the cranes foundation and weather condition(strong wind)
  17. 17. TOWER CRANE: ACCIDENT • 3 February 2009 at about 3.00pm at a construction site, Ayer Keroh Melaka.CASE • Collision of two tower cranes of luffing and hammerhead types. • During the incident, the luffing tower crane was lowering down concrete formwork structures into the transporter lorry while the hammerhead tower crane was slewing. • Both cranes were operating adjacent to each other when part of their working radius and crane height overlapped with one another. • Mainly caused by insufficient safety clearance distance for both cranes that led to the collision. • Failure of the employer to consider the planning, management and traffic control of tower crane operation.

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