Shielding protects workers by using trench boxes or other types of supports to prevent soil cave-ins. Designing a protective system can be complex because you must consider many factors: soil classification, depth of cut, water content of soil, changes caused by weather or climate, surcharge loads (e.g., spoil, other materials to be used in the trench) and other operations in the vicinity.
Other types of excavation protective systems include benching, sloping, and shoring.
- NIH Shielding Systems
- Trench shield – Wikipedia
- Shielding Types – OSHA
- OSHA 1926.652 – Requirements for protective systems
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