Presentation Scope 20/3/2015. Crane-related Accident Statistics. Study of Past Crane Accidents. Targeted Operation

Transcription

1 Chia Chee Yong, Senior Specialist Engineering safety Branch, OSH Specialist Department A Great Workforce A Great Workplace Presentation Scope A Crane-related Accident Statistics B Study of Past Crane Accidents C Targeted Operation 1

2 /3/015 Crane-related Accident Statistics Crane-related accident statistics showed a downward trending since 010 Crane-related Fatalities- 009 to Crane-related Dangerous Occurrences 009 to *Figures accurate up to 10 Mar 015 Crane-related Accident Statistics Crane-related WSH statistics in Crane-related DOs (Monthly) Crane-related DOs (Monthly) Jan Feb Mar Apr May June Jul Aug Sep Oct Nov Dec Crane-related DOs (Cumulative) Crane-related DOs (Cumulative) Jan Feb Mar Apr May June Jul Aug Sep Oct Nov Dec *Figures accurate up to 10 Mar 015

3 Crane-related Accident Statistics Dangerous Occurrences by Types of Industry Construction sector remains as the main contributor to the number of Dangerous Occurrences Other Workplaces Manufacturing Marine Construction January 015 Crawler Crane Fly-jib Failure@Pandan Road 5 February 015 Mobile Crane Boom Pasir Panjang Terminal 4 February 015 Crawler Tower Crane Geck Avenue 3

4 03 March 015 Tower Crane Jib MARINA WAY 03 March 015 Mobile Crane Punggol Walk 09 March 015 Collapse of Mobile Sunview Drive 04 March 015 Ship Crane Jib Jurong Island Waterway 4

5 Past Tower Crane Case Disclaimer: The purpose of this presentation is solely for education, discussion and knowledge sharing. Tower Crane Over-Derrick Construction On July 013, the maintenance team was carrying the replacement of the tower crane s luffing buffer. During the removal of the existing luffing buffer, the boom suddenly flip backwards. The boom over-derricked and the boom movement was finally arrested by the A-frame. There were no injuries as a result of this incident. 5

6 Tower Crane Over-Derrick With the removal of the faulty luffing buffer, there was no mechanism to prevent possible over-derricking of the boom, especially when the boom was positioned at such a large boom angle of between 80 and 85 so as to facilitate the work activity. Tower Crane Over-Hoist Construction On Aug 013, the crane operator was lifting a 1.5-ton pre-cast parapet panel from the storage area at ground level. After the load has cleared the 13th storey of the building, he released the hoisting lever and observed that the load continued hoisting but did not stop. The hook block with the load then struck the trolley above causing the wire rope to snap. This in turn caused the hook block and load to fall to the ground below. 6

7 Tower Crane Over-Hoist Tower Crane Over-Hoist Construction On Oct 013, the crane operator was hoisting up the hook block after the rigger has unrigged a formwork platform from the hook block. Suddenly the hoisting wire rope snapped and the hoist block fell off. It landed on a table formwork surface. At the point, the tower crane was not hoisting any load. There were no injuries. 7

8 JAN Tower Crane-Fire Case Case 1- Mobile Crane Collapse at Worksite Construction The Tower Crane was moving into position to lift 4 sections of mast as part of dismantling procedures. Operator smelled smoke coming from the electrical panel back his seat. He quickly evacuated from the crane cabin Tower Crane Over-Derrick Construction On February 014 at about 1315hrs, The operator was lifting a stack of metal platforms from the ground onto the loading platform of the building under construction. Upon reaching the loading platform, he stopped the crane. But the boom continued to be raised up and could not be stopped. Finally the operator hit the emergency stop button but the boom had already gone over and rested against the A-frame behind him. The load was found suspended near the counter-weight of the tower crane. No one was injured in the incident. 8

9 Common Observation 1. Insufficient Training. Failure to maintain and ensure tower cranes is in good working order Safety Devices 3. Failure to establish and implement a proper safe work procedure 4. Crane Operator Behaviour 5. No proper housekeeping Targeted Operations Operations GoldCrest 9

10 Operation GoldCrest 014 Focus Area : Crane Safety at Construction Worksites Operation Period : 1 July to 31 August 014 Operation GoldCrest is a Special Enforcement Exercise conducted by the Occupational Safety and Health Division of MOM Focus on the safety of lifting operations involving cranes at construction worksites. The -month exercise conducted from 1 July to 31 August 014 covering 80 worksites. Operation GoldCrest 014 Findings Failure to Maintain Cranes Breakages on wire opens Severely corroded wire ropes Kinked wire ropes Damaged, Corroded and Kinked Wire Ropes 10

11 Operation GoldCrest 014 Findings Failure to Maintain Cranes Faulty anti-two block Faulty Safety Devices of Cranes Load Radius Indicator reading not tally with the Load Chart Operation GoldCrest 014 Findings Failure to Maintain Cranes Keys for activation of cranes engine Other Findings Faulty Off Switch Crane Operator had to leave the cabin to turn off engine by means of pulling this lever located at the crane chassis Operator left the cabin while crane was still running 11

12 Operation GoldCrest 014 Findings Failure to Establish and Implement Lifting Plan Lifting plan not addressing all loads to be lifted Generic weight of load provided SWL of Crane not indicated Working radius for lifting operations not indicated Rigging method not included Many found to have established the lifting plan still failed in its implementation Lapses in Lifting plan Implementation Weight of load not identified Operation GoldCrest 014 Findings Lifting Gear Defective Lifting Gears found Lifting Gears which validity expired/ were not examined by an Authorised Examiner Using Defective Lifting Gears (LG) or LG that without AE Examination 1

13 Operation GoldCrest 014 Findings Failure to Implement Proper Permit-to-Work Pre-filled checklist for Permit-to-Work Lapses in Implementation of Permit-To-Work The Permit-to-work failed to detect or ensure daily inspection of crane by crane operator Other Findings Operation GoldCrest 014 Crane Operator failed to extend outriggers of the lorry crane during the lifting operation Examples of Individual's Fined i. Lifting supervisor fined for riding on a hoisted pile test block. ii. Crane Operator was fined for engaging in the unsafe act. iii. Project Manager fined for failure exercise diligence to prevent the unsafe act. 13

14 Operation GoldCrest 014 Top 5 Contraventions Uncovered 1. Failure to maintain cranes in good working order. Failure to establish and implement a proper Lifting Plan 3. Using defective Lifting Gears or Lifting Gears that were not examined by Authorised Examiners 4. Failure to implement a proper Permit-To-Work System 5. No indication of Safe Working Load and Lifting Machine Registration Number on the Lifting Machine Operation Heron A Great Workforce A Great Workplace 14

15 Operation Heron Ops Heron Special Operations on Crane Safety Targeted inspections at worksites Safe use of cranes Safe conduct of lifting operations Functionality of safety devices in cranes Inspection covering implementation of the following Permit-to-work and safe work procedures Risk assessment Lifting plans Maintenance regime Condition of lifting equipment Appointment of certified lifting personnel THANK YOU 15