A stanchion used as part of a regulatory safety barrier around the ledge of an elevated construction slab comprises a square tubular enclosure having an open lower end and a closed upper end. A foot extends orthogonally near the lower end, and rests against the upper surface of the ledge. A clamping member telescopically engaged into the lower end of the enclosure has an arm also extending from its lower extremity and is positioned against the lower surface of the ledge. The arm is urged toward the foot in a ledge-clamping action by the turning of a threaded stem running inside the telescopically engaged enclosure and clamping member. The threaded stem has a lower end captured by a nut welded inside the clamping member. The upper end of the stem protrudes through a hole in the closed end of the enclosure and is fitted with a wing-nut and a hex-nut so that the stem can be turned either by hand or by means of a wrench.
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