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OSHA Construction Glossary - Struck-By

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Chock - A wedge, block, or large stone placed against the tires of a vehicle to prevent its moving, especially on an incline.

Formwork - The total system of support for freshly placed or partially cured concrete, including the mold or sheeting (form) that is in contact with the concrete as well as all supporting members including shores, reshores, hardware, braces, and related hardware.

Jacking operation - The task of lifting a slab (or group of slabs vertically from one location to another (e.g., from the casting location to a temporary (parked) location, or to its final location in the structure), during the construction of a building/structure where the lift-slab process is being used.

Lift slab - A method of concrete construction in which floor and roof slabs are cast on or at ground level and lifted into position using jacks.

Limited access zone - An area alongside a masonry wall that is under construction and clearly demarcated to limit access by employees.

Pre-cast concrete - Concrete members (such as walls, panels, slabs, columns, and beams) which have been formed, cast, and cured before final placement in a structure.

Reshoring - The construction operation in which shoring equipment (also called reshores or reshoring equipment) is placed, as the original forms and shores are removed, to support partially cured concrete and construction loads.

Rollover protective structure (ROPS) - Vehicle structures such as roll-bars, frames, roll-protective cabs etc., designed to prevent the vehicle operator from being crushed as a result of a rollover.

Seatbelt - A device, usually worn around the waist, consisting of a strap or straps anchored to a vehicle so as to hold a person in his seat.

Shore - A supporting member that resists a compressive force imposed by a load; or the operation by which a supporting member is placed.

Vertical slip forms - Forms that are jacked vertically during the placement of concrete.


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