The invention discloses a stand column perpendicularity measuring method and adopts a
prism-
free distance measurement
total station for measurement. The method comprises steps of preparing more than two control points with known three-dimensional coordinates and a centering rod in advance, erecting the
total station at one
control point, and leveling, centering and orientating the
total station; determining an upper section and a lower section on a stand column, measuring
azimuth angles on left and right sides of the upper section by using the total
station, taking an average value of the twoazimuth angles as a central
azimuth angle of the upper section, measuring a horizontal distance from the total
station to a surface of the central
azimuth angle of the upper section without a
prism, and calculating central three-dimensional coordinates of the upper section according to the horizontal distance, a
radius of the stand column and a
vertical angle from the total
station to the surfaceof the central azimuth angle of the upper section; measuring and calculating the lower section according to the same method to obtain the central three-dimensional coordinates of the lower section; and calculating an inclination angle and an inclination azimuth angle of the stand column by utilizing the central three-dimensional coordinates obtained by calculating the upper section and the lower section, and finally obtaining perpendicularity of the stand column.