Continuing Education Third Quarter 2017 Session 3 Trench Hazards 32 Injury and Death Unprotected trenches and excavations can be hazardous Most accidents occur in trenches 515 feet deep There may be no warning before a cavein ID: 628609
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3-1
Trenching & Excavations
Continuing Education
Third Quarter 2017
Session 3Slide2
Trench Hazards
3-2Slide3
Injury and DeathUnprotected trenches and excavations can be hazardousMost accidents occur in trenches 5-15 feet deepThere may be no warning before a cave-in
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Protection from Falls, Falling Loads, and Mobile EquipmentInstall barricadesHand / mechanical signalsGrade soil away Fence or barricade trenches left overnightUse a flag person when signs, signals and barricades are not enough protection
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Protection from Falling ObjectsDon’t operate equipment above workers Maintain equipment distance from the edge by using warning systems spotters or stop logs
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Means of EgressA stairway, ladder, or ramp must be present in excavations that are 4 or more feet deep25 feet lateral travel distance from the employeesThe ladder should extend 3 feet above the top of the excavation
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Access and Egress
These two lashed together ladders are not an adequate means of egress
The ladder should extend 3 feet above the top of the excavationSlide8
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Other Excavation Hazards
Water accumulation
Oxygen deficiency
Toxic fumes
Access/Egress
FallsSlide9
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Water is Hazardous
Water in an excavation is hazardous
Employees cannot work in an excavation where:
Water has accumulated
Water is accumulatingSlide10
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Hazardous Atmosphere
Test excavations more than 4 feet deep before an employee enters the excavation for:
Oxygen deficiency
High combustible gas concentration
High levels of other hazardous substancesSlide11
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Dig SafeSlide12
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At Risk?
No Cave-in Protection
Close proximity of equipment
Spoil pile too close
No ladder
Unsupported utilities
No head protection
Suspended load
Fall Hazard