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Transcript of EXCAVATION & TRENCH SAFETY - pncwa.memberclicks.net file• Soils are classified by OSHA into three...
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EXCAVATION & TRENCH SAFETY
BY John T. Shawcroft
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TRENCH COLLAPSE HAZARDS
• Four types to be aware of:– 1. Spoil Pile Slide– 2. Shear Wall Collapse– 3. Belly Slough– 4. Lip Slide
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Spoil Pile Slide 8 ft. trench
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Belly Slough 8 ft. trench
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Shear Wall Collapse 8 ft. trench
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Lip Slide 8 ft. trench
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RESCUES
• Facts and figures
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Trench Rescue
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Trench Rescue in Progress
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Classification of Soil Types
• Soils are classified by OSHA into three types:
» 1. Group A - clay, hardpan, and caliche » 2. Group B – loam, sandy loam, silt, silty loam &
angular gravel» 3. Group C – sand and other “running” types of
soil
• Soils can and do shift from one type to another as the environment acts upon it.
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Access Ladder with Shoring
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Ladder in Trench
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What’s Wrong?
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Inspection
• Daily inspection of excavation and adjacent areas by a competent person prior to start of work each shift and as needed throughout the shift.
• Inspections must be made after each rain storm or other hazard-increasing event.
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OSHA QUICK CARD
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Type A Soil
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Soil Type B
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Type C Soils
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Simple Bench for Type A Soils
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Adjustable Shielding Strut
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Access Ladder with Shoring
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Credits• National Institute for Occupational Safety &
Health Spokane Research Laboratory – Trench Safety Awareness
• Excavation/ Trenching Safety – Veolia Water EHS&S
• 29 CFR 1926.652 Safety Rules• Texas Trial Lawyer: Trench Collapse Accidents
& Excavation Cave-in Injuries & DeathsWillis Law Firm1221 McKinney; Suite 3333Houston, TX