WORKER PINNED BETWEEN TRUCK AND PRECAST CONCRETE DOORWAY Type of Incident: June 22, 2009 Date of Incident: Fatal 1 August 11, 2010
File: F-152071 TABLE OF CONTENTS SECTION TITLE PAGE NUMBER 1.0 DATE AND TIME OF INCIDENT 3 2.0 NAME & ADDRESS OF PRINCIPAL PARTIES 3 2.1 Owner 3 2.2 Prime Contractor 3 2.3 Employer(s) 3 2.4 Contractor(s) 3 2.5 Supplier(s) 3 2.6 Worker(s) 3 2.7 Other(s) 3 3.0 DESCRIPTION OF PRINCIPAL PARTIES 4 3.1 Prime Contractor 4 3.2 Employers 4 4.0 LOCATION OF INCIDENT 4 5.0 EQUIPMENT, MATERIAL AND OBSERVATIONS 4 5.1 Equipment and Material 4 5.2 Observations 4 6.0 NARRATIVE DESCRIPTION OF INCIDENT 4 7.0 ANALYSIS 5 7.1 Direct Cause 5 7.2 Contributing Factors 5 8.0 FOLLOW-UP/ ACTION TAKEN 6 8.1 Occupational Health and Safety 6 8.2 Industry 6 8.3 Additional Measures 6 9.0 SIGNATURES 7 10.0 ATTACHMENTS 7 2 August 11, 2010
File: F-152071 SECTION 1.0 DATE AND TIME OF INCIDENT 1.1 The incident occurred on June 22, 2009 at approximately 10:15 a.m. Worker succumbed to his injuries at approximately 1:20 p.m. SECTION 2.0 NAME AND ADDRESS OF PRINCIPAL PARTIES 2.1 Owner(s) 2.1.1 Derrick Concrete Cutting & Construction Ltd. 7039 Gateway Blvd. Edmonton, Alberta T6H 2J1 2.2 Prime Contractor 2.2.1 Willow Spring Construction (ALTA.) Ltd. #201, 4525 101 Street Edmonton, Alberta T6E 5C6 2.3 Employer(s) 2.3.1 Derrick Concrete Cutting & Construction Ltd. 7039 Gateway Blvd. Edmonton, Alberta T6H 2J1 2.4 Contractor(s) 2.4.1 Non-applicable 2.5 Supplier(s) 2.5.1 Non-applicable 2.6 Worker(s) 2.6.1 Worker1 3402 49 Avenue Red Deer, Alberta T4N 3W2 2.7 Others 2.7.1 Non-applicable 3 August 11, 2010
File: F-152071 SECTION 3.0 DESCRIPTION OF PRINCIPAL PARTIES 3.1 The prime contractor, Willow Spring Construction (ALTA.) Ltd. is a quality provider of office/retail interiors contracting, general contracting, design build and construction management services to Western Canada s industry and businesses. 3.2 Derrick Concrete Cutting & Construction Ltd. provides a variety of almost every type of concrete cutting, construction or specialty demolition. SECTION 4.0 LOCATION OF INCIDENT 4.1 8825 51 Avenue, Edmonton.(Attachment A Map). SECTION 5.0 EQUIPMENT, MATERIAL AND OBSERVATIONS 5.1 Equipment and Material 5.1.1 Cushion Cut / Longyear Wall Saw Header Model # 360 (Attachment C Photograph #1) 5.1.2 Concrete Slab measuring 1.3 m wide x 2.21 m long x 15 cm thick and approximate weight of 816 kg. (Attachment C Photograph # 6) 5.2 Observations 5.2.1 Occupational Health and Safety were notified about the incident after the worker had succumbed to his injuries at the hospital. The incident occurred at approximately 10:15 a.m. on June 22, 2009 and the worker died at approximately 1:20 p.m. on June 22, 2009. 5.2.2 When the investigating officers arrived at the location the scene had been cleaned up and the equipment removed. The slab of concrete was lying on the ground outside a building under construction, where it had fallen after being cut from the building s concrete wall. 5.2.3 The procedure for wall sawing includes the placement of wedges in the bottom and top cuts on both sides of the opening, approximately 15 to 30 cm from the vertical cuts. Prior to making the final cut, there is to be a track or safety strapping bolted across the opening so the wall will not fall prematurely. In addition, the fall area is to be cleared. SECTION 6.0 NARRATIVE DESCRIPTION OF THE INCIDENT 6.1 On June 22, 2009 two workers, Worker1 and Worker2 were assigned to proceed to a job site to cut out a doorway in a pre-cast concrete wall at a facility under construction. 4 August 11, 2010
File: F-152071 6.2 Worker 1 and Worker 2 arrived at the work site and were directed to the location where the doorway was to be cut. The two workers performed a pre-job hazard assessment and then set up their equipment. 6.3 Worker 1 and Worker 2 mounted a wall saw to cut an opening through the pre-cast concrete wall. 6.4 After the wall saw had been mounted the two workers were ready to cut the doorway. Worker 2 proceeded to start cutting the pre-cast concrete for the doorway. Worker 2 cut the bottom, top and right side and Worker 1installed metal wedges in the bottom cut, Worker 2 then proceeded to make the last left side cut for the doorway. 6.5 When Worker 2 finished the last cut on the left side he shut the saw off and Worker 1 unhooked the hydraulic hoses. Worker 2 went to the cab of the truck to reduce the idle speed which was operating the power take off for the wall saw. 6.6 Worker 1 was at the rear of the truck when the slab of concrete fell and pinned him against the truck. 6.7 As Worker 2 was at the cab of the truck he heard a moan at the rear of the truck. When he went to the rear of the truck he discovered Worker 1 pinned underneath of the slab of concrete that had been cut for the doorway. Worker 2 immediately called for assistance. 6.8 Other workers at the work site came to the assistance of the injured Worker 1 and lifted the slab of concrete off him and performed emergency first aid. Emergency medical services were called and when they arrived, the injured Worker 1 was transported to the hospital for further medical assessment. 6.9 Worker 1 succumbed to his injuries at the hospital. SECTION 7.0 ANALYSIS 7.1 Direct Cause 7.1.1 The Worker received serious crush injuries that became fatal later that day as a result of him being crushed under a falling concrete slab. 5 August 11, 2010
File: F-152071 7.2 Contributing Factors 7.2.1 The two workers did not follow the procedure developed by Derrick Concrete Cutting & Construction Ltd. 7.2.2 There was insufficient wedging of the concrete slab as required in the procedure referred to in Section 5.2.3. There were no wedges placed in the top cut prior to making the last left side cut. SECTION 8.0 FOLLOW-UP/ ACTION TAKEN 8.1 Employment and Immigration; Occupational Health and Safety 8.1.2 Occupational Health and Safety issued an order to Derrick Concrete Cutting & Construction Ltd. to conduct an incident investigation, prepare a report and have it available to Occupational Health and Safety for review. 8.1.3 Occupational Health and safety issued an order to Derrick Concrete Cutting & Construction Ltd. to submit for review; training records of the fatally injured worker and co-worker, orientation records, and a copy of the hazard assessment that was prepared prior to the start of the work where the incident occurred. 8.2 Industry 8.2.1 Derrick Concrete Cutting & Construction Ltd. submitted an incident investigation report to Occupational Health and Safety for review. 8.2.2 Derrick Concrete Cutting & Construction Ltd. submitted the following documentation to Occupational Health and Safety; training records of the fatally injured worker and co-worker, orientation records and the hazard assessment that was prepared prior to the start of the work where the incident occurred. 8.3 Additional Measures 8.3.1 No further measures at this time. 6 August 11, 2010
File: F-152071 SECTION 9.0 SIGNATURES Original Report Signed Lead Investigator Original Report Signed OHS Officer Original Report Signed Manager Original Report Signed Director North Date Date Date Date SECTION 10.0 Attachment A Attachment C ATTACHMENTS: Map No Diagram Photographs 7 August 11, 2010
Attachment A" Map 8 August 11, 2010
No Diagram 9 August 11, 2010
Page 1 of 7 Photograph #1, taken by Derrick Concrete Cutting & Construction Ltd. The red arrow shows the wall mounted concrete saw that was used to cut the 15 cm thick concrete slab for a doorway. View is looking east. The white arrow indicates the water from the saw cutting operation. 10 August 11, 2010
Page 2 of 7 Photograph #2, taken by Derrick Concrete Cutting & Construction Ltd. Shows the saw and concrete slab leaning against the opening. 11 August 11, 2010
Page 3 of 7 Photograph #3, taken by Derrick Concrete Cutting & Construction Ltd. A view looking from the east at the incident scene. 12 August 11, 2010
Page 4 of 7 Photograph #4, taken by Derrick Concrete Cutting & Construction Ltd. A closer view looking from the west at the incident scene. 13 August 11, 2010
Page 5 of 7 Photograph #5, taken by Derrick Concrete Cutting & Construction Ltd. Shows the rear of the truck with the hydraulic hoses disconnected from the saw. 14 August 11, 2010
Page 6 of 7 Photograph #6, taken by Occupational Health and Safety. The scene the investigating officers discovered when they arrived. The slab of concrete was lying on the ground and the hole had been covered by plywood. Measurements of the slab 2.21 m long by 1.3 m wide by 15 cm thick. 15 August 11, 2010
Page 7 of 7 Photograph #7 taken by Occupational Health and Safety. Shows from the inside where the doorway had been cut and covered up with plywood. 16 August 11, 2010
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