Counter-force frame device for bridge swivel construction and construction method of counter-force frame device

The invention discloses a counter-force frame device for bridge rotation, which comprises a counter-force frame, and a jack is mounted on one side, close to a supporting leg, of the counter-force frame; the counter-force frame is of a steel structure, is fixed to the sliding way and is arranged in a neutral symmetry mode along the circle center of the sliding way. Under the boosting working condition and the reverse pushing working condition, the relative positions of the reaction frame and the supporting feet are different, and meanwhile the installation directions of the jacks on the reaction frame are different. With the rotation direction of the bridge as the front, under the boosting working condition, the counter-force frame is installed behind the supporting feet, and the boosting direction of the jack is consistent with the rotation direction of the rotation bridge; under the working condition of reverse pushing, the counter-force frame is installed in front of the supporting feet, and the boosting di