Semi-automatic height-adjusting support and adjusting method thereof

The invention belongs to the technical field of supports for buildings or bridges and adjusting methods thereof and discloses a semi-automatic height-adjusting support and an adjusting method thereof. The support is mainly and technically characterized by comprising an upper seat plate at the upper end, a spherical core, a middle seat plate and a lower seat plate, wherein a planar sliding plate is arranged between the spherical core and the upper seat plate, a spherical sliding plate is arranged between the middle seat plate and the spherical core, the middle seat plate comprises a top plate at the upper end and a stand column at the lower end, the center of the lower seat plate is provided with a stand column hole, the stand column is inserted into the stand column hole, a worm gear and a worm matched with the worm gear are arranged on the outer side of the part, above the stand column hole, of the stand column, the worm gear and the stand column are in threaded connection, worm brackets are arranged at the