The invention discloses a hole reaming method for hole reaming equipment on a construction site. A connecting rod is gradually lowered under the action of a power mechanism, the connecting arm rotates around the pin shaft 2 and the pin shaft 1, and the scraping mechanism rotates around the connecting pin, so that The connecting arm is horizontal, and the reaming equipment rotates around its axis, so that the scraping teeth scrape the wall of the original
pile hole. After the scraping mechanism is expanded to the maximum state, the hole formed by scraping is formed; the connecting rod is gradually raised by the action of the power mechanism. The connecting arm rotates around pin 2 and pin 1, and the scraping mechanism rotates around the connecting pin, so that the connecting arm tilts from the horizontal state, and the scraping mechanism shrinks to the minimum state; the reaming equipment is pulled out along the original
pile hole to the hole outside. The
diameter of the hole expanded by this reaming method is high in longitudinal depth, and the
diameter reduction range at the bottom of the hole and the original
diameter of the
pile hole is reduced, so that the bearing force after grouting is increased, the stability of the upper building can be maintained, and the reaming efficiency is high. And it can protect the security of the equipment.