Clause 25.2 of the CSA S16-14 states that “columns shall be fitted with at least four anchor rods. When four non-colinear anchor rods for erection safety are not feasible, special precautions shall be taken.” The requirement for a minimum of four anchor rods aims to ensure erection safety. The rods should be positioned to provide an adequate lever arm against overturning in more than one direction. For detailed erection safety requirements, consult local construction safety regulations.
Common configurations for four non-colinear anchor rods are shown in the figures below.