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Trench Cave-in: Fatal Fact #9
Construction Company Type: Pipe Laying
Accident Description:
Two employees were installing storm drain pipes in a trench, approximately 20-30 feet long, 12-13 feet deep and 5-6 feet wide. The side walls consisted of unstable soil undermined by sand and water. There was 3-5 feet of water in the north end of the trench and 5-6 inches of water in the south end. At the time of the accident, a backhoe was being used to clear the trench. The west wall of the trench collapsed, and one employee was crushed and killed.
OSHA Recommendations:
- Employers must shore, slope sheet or brace sides of trenches in unstable material (29 CFR 1926.652(b) or 1926.651(c)).
- There must be a means of escape from a trench such as ladder (29 CFR 1926.652(h)).
- Trench work is to be inspected daily by a "competent person". When there s evidence of cave-ins or slides, all work must stop (29 CFR 1926.650(i)).
- Water must not be allowed to accumulate in a trench (29 CFR 1926.651(p)).
- Excavation material must be moved at least two feet from the edge of the trench (29 CFR 1926.651(i)).
- Where heavy equipment is operating near a trench, extra precautions must be taken due to the extra load imposed on the ground (29 CFR 1926.651(q)).
Inspection Results
As result of the its investigation, OSHA issued citations for one willful, one serious, and one-other-than-serious violation of its construction standards.
OSHA's construction safety standards include several requirements which, if they had been followed here, might have prevented this fatality.
Sources of Help
- Construction Safety and Health Standards (OSHA 2207) which contains all OSHA job safety and health rules and regulations covering construction.
- Excavation and Trenching Operations (OSHA 2226), is a 20-page booklet describing pertinent OSHA standards in detail.
- Safety and Health Excavation and Trenching Operations, available from the National Audio Visual Center (NAC) (Order No. 689601, $60) an instructional program designed to increase awareness and understanding of the problems and hazards in excavation and trenching operations. It includes an instructor's guide and 139 slides.
- Trenching, also available from NAC (Order No. 007516, $40), a slide-tape hazard recognition program including 96 slides, instructor's guide, workbook and course outline.
- Sloping, Shoring and Shielding, a one-day instructional program with classroom sessions and hands-on workshop. Available from NAC (Order No. 009863, $30), the package includes an instructor's manual, outline for field exercise/workshop and 60 slides.
Accident Details: Trench Cave-in |
|
| Company Type: | Pipe Laying |
| Crew Size: | 3 |
| Union/Collective Bargaining? | No |
| Weather: | Good |
| Worksite Inspection? | No |
| Designated Competent Person on Site? | No |
| Employer Safety and Health Program? | No |
| Training and Education for Employees? | No |
| Craft of Deceased Worker(s): | Pipe Layer |
| Age / Sex of Deceased Worker(s): | 32; male |
| Experience or Time on Job: | 4 months |
| Time on Project: | 5 minutes |
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