Trench shield: Difference between revisions
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[[File:Trench box.jpg|thumb|right|Image of the trench box in situ with chains still attached and the escape ladder in place]] |
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'''Trench shields''' are [[steel]] or [[aluminum]] structures used for protecting [[utility worker]]s while performing their duties within a [[trench]]. They are customarily constructed with sidewalls of varying thicknesses held apart by steel or aluminum spreaders. Spreaders can be interchanged to match the width of the trench. The different materials and building designs lead to a variety of depth ratings, i.e. the depth of a trench that the shield can withstand a collapse without buckling. Depth ratings are determined by registered [[professional engineer]]s. |
'''Trench shields''' are [[steel]] or [[aluminum]] structures used for protecting [[utility worker]]s while performing their duties within a [[trench]]. They are customarily constructed with sidewalls of varying thicknesses held apart by steel or aluminum spreaders. Spreaders can be interchanged to match the width of the trench. The different materials and building designs lead to a variety of depth ratings, i.e. the depth of a trench that the shield can withstand a collapse without buckling. Depth ratings are determined by registered [[professional engineer]]s. |
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Revision as of 19:43, 6 December 2013
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Trench shields are steel or aluminum structures used for protecting utility workers while performing their duties within a trench. They are customarily constructed with sidewalls of varying thicknesses held apart by steel or aluminum spreaders. Spreaders can be interchanged to match the width of the trench. The different materials and building designs lead to a variety of depth ratings, i.e. the depth of a trench that the shield can withstand a collapse without buckling. Depth ratings are determined by registered professional engineers.
A shield should not be confused with a shore. While they may serve the same function, trench shoring is a different physical application that holds up the walls of a trench to prevent collapse.
In the US, use of a trench shield is governed by OSHA 29 CFR Part 1926.650-.652 Subpart P-Excavations