RISK ASSESSMENT FOR DISMANTLING TOWER CRANE

 RISK ASSESSMENT FOR DISMANTLING TOWER CRANE 

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A- Activities

1-Preparation work

1. Workers ascend to the working area on top of the crane.
2. Written instruction / any popping is to be signed off by R.E. before works commence.
3. Self-jacking to lower down tower mast.
4. Un-reeving of hoisting wire rope
5. Loosen the hoisting wire rope and u-clip.

2-Dismantling of Counterweights by mobile crane

1. Setting up - mobile crane (25 tons)
2. Secure the counterweights with a sling
3. Removed the lock pins and lifted out the bracket
4. Slowly hoist down to the ground using a Mobile Crane (25 tons)

3- Dismantling of Counterweights (CW) by mobile crane

1. Setting up - mobile crane (25 tons)
2. Secure the counterweights with a sling
3. Removed the lock pins and lifted out the bracket
4. Slowly hoist down to the ground using a Mobile Crane (25 tons)

4-Dismantling of boom section.

1. Secure, tension, and remove the relevant pins and spring clamps from the boom section mounting
2. Lift using a mobile crane (25 tons) and disconnect from the slewing table, joint and slowly hoist down to the ground

5-Dismantling of counterweights by mobile crane 

1. Setting up a mobile crane
2. Secure the counterweight with a sling
3. Removed the lock pin and lifted out the bracket
4. Slowly hoist down to the ground using a mobile crane (25 tons)

6-Dismantling of the top tower 

1. Secure, tension it, and remove the relevant pins and spring clamp from the slewing table joint
2. Using a mobile crane slowly hoist down the tower top to the ground (25 tons)

7-Termination of power supply

1. Terminate power supply
2. Disconnect cable connection

8-Dismantling of hoisting winch

1. Using a mobile crane slowly hoist down tower top to the ground (25 tons)

9-Dismantling of counter jib a) 

1. Secure, tension, and remove the relevant pin and spring clamps from the counter jib section mounting
2. lift using a mobile crane (2nos, 25 tons / 25 tons) and disconnect from the slewing table, joint and slowly hoist down to the ground

10- Dismantling of the operator's cabin

1. Secure and use a mobile crane to lift out of the slewing table joint (25 tons)
2. Using a mobile crane slowly hoist the operator cabin down to ground level (25 tons)

11- Dismantling of the slewing table assembly

1. Secured with slings, tension it, and remove the 8 No’s of bolts and nuts from the mast joint
2. Using a mobile crane slowly lift/disengage and hoist down to the ground (25 tons)

12-Dismantling of 6 no’s mast section by (3) hoisting operation

1. Remove the relevant pins
2. Use a mobile crane to slowly hoist down to the ground (25 tons)

13-dismantle and remove collars and I-beam

1. Use a mobile crane to slowly hoist down to ground level (25 tons)

14-Loading into a 40-footer lorry

1. The lorry moves in and out and parks within the designated loading area
2. Put timber wedge and using a mobile crane (25 tons), hoist the component and transfer safely into the lorry

B-HAZARDS

1. Lifting gear failure.
2. Unsafe work practice.
3. Height suspended load
4. Hand/finger crush in between
5. Slip, trip, and fall
6. Ergonomics
7. Crane Overturned
8. Overhead Electrical
9. Mechanical Failure
10. Steel wire rope snapped
11. Falling object
12. Working at height

C- EFFECTS/CONSEQUENCES

1. Workers slip and fall from height
2. Lightning strike
3. Damage to existing building structure/machinery.
4. Serious injury or fatality.
5. Workers fall from height
6. Crush-in between counterweight
7. Electrical shock
8. Hit by a flying object
9. Crush in between
10. Falling objects, workers fall from height
11. Hand/ finger/ eye injury.
12. Wire rope detaches and swings through the air
13. Crush in between the main jib
14. The jib section of the crane may hit an overhead structure or service cable and cause asset/machinery damage

D- Current Control                

1. Riggers must have a safety harness during climbing, working on top, or while climbing down.
2. To immediately stop doing work during/the possibility of heavy rain, lightning strikes, or strong wind.
3. The certified crane operator, lifting supervisor, and rigger/signalman.
4. A competent person to ensure all is properly secure before lower-down work is done.
5. To follow the recommended SWL from the manufacturer for wire rope and Shackles that going to be used.
6. Visual Inspection for any kinks, wear, and broken wire.
7. Proper PPE (safety helmet, safety boots, safety harness, hand glove)
8. Ensure a PMA is valid, and the operator is competent
9. planks as an additional sleeper.
10. Barricade area below tower crane hoisting spot
11. ensure safety harness is in used all times
12. To check and ensure mobile crane is in a proper setup and suitable working radius
13. barricade area below the tower crane hoisting spot level
14. Ensure the mobile crane rests on solid and firm ground and use steel plate and solid timber planks as an additional sleeper.
15. check all the mobile crane electrical systems, mechanical systems, safety devices, and indicators are in order.
16. check maximum loading calculation and maximum safe working radius and confirm with mobile crane design load chart for safe operation.
17. Use a suitable container to store small components and tools
18. barricade area below the tower crane hoisting spot provides a signalman
19. To check and ensure the mobile crane is in a proper setup and suitable working radius
20. Ensure all unauthorized workers are clear from the affected work area when hoisting of the jib is in progress
21. To ensure there is proper clearance and no interference by another crane while dismantling and hoisting of the A-frame is in progress
22. To secure the JIB properly and lift slowly to confirm the C.G before hoisting down slowly to ground level.
23. To ensure all unauthorized workers are clear from the affected work area
24. use tagline to assist in hoisting
25. To ensure small hand tools are put in the proper container or sling bag
26. No tools or objects shall be placed in open space
27. To check on lifting gears to be secured properly and in the right static hooking point.
28. To confirm the physical condition of CG is in good order
29. To use the container for small component storage
30. To fully barricade the area below the tower crane
31. To monitor closely while hoisting down the mast section
32. To stand by a flagman to guide the lorry
33. To ensure the tagline is used during hoisting
34. The area within the mobile crane hoisting radius is to be fully barricaded to provide a signalman to assist in hoisting

E- Additional Control                      

1. Briefing all workers on the risk and proper work method before carrying out the task
2. To have a toolbox talk before starting work every morning.
3. Check all equipment and tools before starting and report for any malfunction or problem immediately.
4. Conduct safety briefings to workers before starting work.
5. Working/Operational ground area must be barricaded and a warning sign to ensure no other activity has been carried out.
6. Wind the wire rope properly place it on the platform and tighten it down.
7. Provide signalman to communicate with operator and riggers during work being done.
8. Check all the mobile crane electrical systems, mechanical systems, safety devices, and indicators are in order
9. Check maximum loading calculation and maximum safe working radius and confirm with mobile crane design load chart for safe operation.
10. Tools like hammers must be fitted with good-quality wooden handles.
11. No tools or objects shall be placed in open space
12. Provide signalman
13. Use tagline to assist in hoisting
14. Proper PPE (safety helmet, safety boots, safety harness, hand glove)
15. Tools to be secure / tie-off avoiding falling to the ground.
16. Competent person to ensure all power in a proper earthing.
17. Stop immediately if there is strong wind/ possibility of bad weather
18. To ensure all unauthorized workers are clear from the affected work area
19. To clear any loose object from the slewing table
20. Use the container to place small components
21. Signalman to blow whistles and clear all unauthorized workers in the affected work area.
22. To clear and housekeeping at the loading area
23. Put barricade/ warning sign
24. Use the whistle to warn nearby workers/public
25. To provide a flagman to control and manage traffic.

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