Excavation, Trenching, and Soil Mechanics
Points To Be Covered:
DANGER!
PPT Slide
Fatal Facts!
1926.650-Scope and Application
What Is Soil?
Weighing in on Soil
Mechanics of a Cave-In
Diagram of a cave in
Protecting Employees in Excavations
Protective Systems
So We have Options:
29 CFR 1926.652(b)(4)(i)
Competent Person
1926.651(k)(1) Inspections
Access and Egress 1926.651 (c)(2)
Soil Tests
Visual Test
Manual Tests
Thumb Penetration Test
SOLID ROCK
Type A Soil
A Soil is NOT type A IF:
Sources of Vibration
Type B Soil
Type C Soil
Sloping Requirements by Soil Type
Sloping in Type A Soil
Sloping in Type B Soil
Sloping in Type C Soil
Trench Boxes or Shield Systems:
Trench Boxes or Shield
Is this allowable?
Trench Boxes and Sloping or Benching
Shoring (Shoring System)
Hydraulic Shoring
Stacked Hydraulic Shores
Whaler System
Surface Encumbrances
Utilities
Locates
Can an Excavation be a Confined Space?
Summary
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