Pedestal drill and method for conducting concrete structure rear anchorage through same

The invention relates to a pedestal drill which comprises a drill rod, a movable blade and a thrustor. The thrustor comprises a circular base plate, a center rod and a sliding gasket. The circular base plate, the center rod and the drill rod are coaxially arranged. The circular base plate is arranged below the drill rod. The diameter of the circular base plate is the same as that of the drill rod. The bottom of the drill rod is provided with a blind hole. The top of the center rod is arranged in the blind hole, and the bottom end of the center rod is connected with the circular base plate. The opening end of the blind hole is provided with a limiting mechanism for preventing the upper end of the center rod from leaving the blind hole. The movable blade is arranged on the circular base plate. The cutting edge is away from the center rod. The movable blade slides in a sliding groove so as to expand out of the drill rod or draw back into the drill rod. The sliding gasket is arranged between the bottom of a blade body and the circular base plate. Sliding media are arranged between the sliding gasket and the circular base plate. The invention further provides a method for conducting concrete structure rear anchorage through the pedestal drill. The pedestal drill is simple in structure, low in manufacturing cost and easy and convenient to use, workers can operate the drill without being trained, and working efficiency is effectively improved.