Abstract: A safety-anchor assembly of a fall-protection lifeline system for workers configured to be implemented in a work area defining a lower surface and an upper surface spaced from the lower surface, the lower and upper surfaces of the work area each substantially planar and oriented substantially parallel with each other. The safety-anchor assembly includes a base tube and a staff tube adjustably attached to the base tube to form a post shore extending under compression pressure between and frictionally supported upon the lower and upper surfaces of the work area to prevent movement of the post shore with respect to the lower and upper surfaces, an acute angle of about eighty-one degrees being defined between the post shore and the lower surface of the work area and a corresponding obtuse angle of about ninety-nine degrees being defined between the post shore and the upper surface of the work area.