Pile hole expanding tool for mechanical hole-forming cast-in-place pile

The utility model provides a mechanical hole-forming cast-in-place pile hole expanding tool which comprises an upper connecting frame, side mounting plates are welded to the front side and the rear side of the lower portion of the upper connecting frame respectively, a movable sleeve is welded to the middle of the lower side of the upper connecting frame, a fixed limiting pipe is inserted into the movable sleeve, and a base is welded to the lower end of the fixed limiting pipe. U-shaped seats are respectively welded on the left and right sides of the upper part of the base. Through the arrangement of the connecting cloth cylinder, the mounting pipe and the rectangular fixing cylinder, the movable sleeve and the fixed limiting pipe can be protected, dust or soil is prevented from affecting stretching and retracting of the movable sleeve, and corrosion to the movable sleeve and the fixed limiting pipe is reduced. 本实用新型提供一种机械成孔灌注桩桩孔扩孔具，包括上连接架，所述的上连接架的下部前后两侧分别焊接有侧安装板，上连接架的下侧中部焊接有活动套管，活动套管的内部插接有固定限位管，固定限位管的下端焊接有底座