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Surcharge means an excessive vertical load or weight caused by spoil, overburden, vehicles, equipment, or activities that may affect trench stability. Subsurface Encumbrances include underground utilities, foundations, streams, water tables, transformer vaults, and geological anomalies.

Support System refers to structures such as underpinning, bracing, and shoring that provide support to an adjacent structure or underground installation or to the sides of an excavation or trench.

MIXED IN KEY V2.5 PROFESSIONAL

However, a professional engineer who is registered in any state is deemed to be a 'registered professional engineer' within the meaning of Subpart P when approving designs for 'manufactured protective systems' or 'tabulated data' to be used in interstate commerce. Registered Professional Engineer is a person who is registered as a professional engineer in the state where the work is to be performed.

Protective systems include support systems, sloping and benching systems, shield systems, and other systems that provide the necessary protection. Protective System refers to a method of protecting employees from cave-ins, from material that could fall or roll from an excavation face or into an excavation, and from the collapse of adjacent structures. In trenching and excavation operations, they refer to the provision of safe means for employees to enter or exit an excavation or trench. Ingress and Egress mean 'entry' and 'exit,' respectively. Hazardous Atmosphere is an atmosphere that by reason of being explosive, flammable, poisonous, corrosive, oxidizing, irritating, oxygen-deficient, toxic, or otherwise harmful may cause death, illness, or injury to persons exposed to it. If a form or other structure installed or constructed in an excavation reduces the distance between the form and the side of the excavation to 15 ft (4.6 m) or less (measured at the bottom of the excavation), the excavation is also considered to be a trench. In general, the depth of a trench is greater than its width, and the width (measured at the bottom) is not greater than 15 ft (4.6 m). A Trench is a narrow excavation (in relation to its length) made below the surface of the ground. An Excavation is any man-made cut, cavity, trench, or depression in an earth surface that is formed by earth removal. DefinitionsĪccepted Engineering Practices are procedures compatible with the standards of practice required of a registered professional engineer.Īdjacent Structures Stability refers to the stability of the foundation(s) of adjacent structures whose location may create surcharges, changes in soil conditions, or other disruptions that have the potential to extend into the failure zone of the excavation or trench.Ĭompetent Person is an individual who is capable of identifying existing and predictable hazards or working conditions that are hazardous, unsanitary, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate or control these hazards and conditions.Ĭonfined Space is a space that, by design and/or configuration, has limited openings for entry and exit, unfavorable natural ventilation, may contain or produce hazardous substances, and is not intended for continuous employee occupancy.Įxcavation.

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This chapter is intended to assist OSHA Technical Manual users, safety and health consultants, OSHA field staff, and others in the recognition of trenching and shoring hazards and their prevention. 652 to make the standard easier to understand, permit the use of performance criteria where possible, and provide construction employers with options when classifying soil and selecting employee protection methods. OSHA recently revised Subpart P, Excavations, of. IntroductionĮxcavating is recognized as one of the most hazardous construction operations. Industrial Robots and Robot System SafetyĮxcavations: Hazard Recognition in Trenching and ShoringĬontrolling Lead Exposures in the Construction Industry: Engineering and Work Practice Controlsįor problems with accessibility in using figures and illustrations in this document, please contact the Office of Science and Technology Assessment at (202) 693-2095. Oil Well Derrick Stability: Guywire Anchor Systems Legionnaire's Disease, see OSHA's Safety and Health Topics Page for updated information.Ĭontrolling Exposure to Hazardous Drugs, see OSHA's Safety and Health Topics Page for updated information. Polymer Matrix Materials: Advanced Composites

Technical Equipment: On-site Measurements

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