Tubular pile grouted core uplift test device and test method thereof

The invention belongs to the technical field of engineering pile foundations, and relates to a tubular pile grouted core uplift testing device. The device comprises a loading mechanism, a connecting mechanism and a displacement measuring mechanism, the loading mechanism comprises at least two jacks, one end of each jack is fixed above a tubular pile, and the other end of each jack is connected with a steel bar in a grouted core on the inner side of the tubular pile; the connecting mechanism comprises an upper base plate and a lower base plate which are arranged on the upper side and the lowerside of the jack, the upper base plate is connected with the reinforcing steel bar through a force transmission beam, and the lower base plate is arranged between the jack and the tubular pile; and the displacement measuring mechanism comprises a displacement meter and a displacement meter base used for fixing the displacement meter, the displacement meter base is fixed to the lower base plate, and a measuring end pointer