It mandates that trenches five feet deep or greater require a protective system, unless the excavation is made entirely in stable rock. For trenches between four and five feet, a competent person must evaluate the soil conditions to determine if shoring or shielding is necessary.
OSHA Inspection Procedures for Trench Shoring Compliance
Both methods require precise calculation and installation to ensure the structure can handle the lateral earth pressure exerted by the surrounding soil. Timber and Aluminum Shoring Traditional timber shoring involves placing vertical supports (posts) and horizontal wales to maintain the integrity of the soil matrix.
A competent person must inspect the trench at the start of each shift, after any occurrence that could affect stability, and following any rainstorm. Because they distribute pressure evenly, hydraulic shores are a preferred choice for sandy or loamy soils where traditional timber shoring might be less effective.
OSHA Inspection Procedures for Trench Shoring Compliance
Hydraulic Shores Hydraulic shores utilize pumps and hydraulics to apply pressure to trench walls, preventing movement and maintaining the desired spacing. This individual must be capable of identifying existing and predictable hazards in the surrounding area and authorized to take prompt corrective measures to eliminate them.
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