Bridge girder erection machine and erection method using bridge girder erection machine

The invention discloses a bridge girder erection machine and an erection method using the bridge girder erection machine. The bridge erection machine comprises a crown block power system, wherein the crown block power system comprises a speed adjusting mechanism, a beam part fixing mechanism, a locking mechanism, a weight sensor, a gradienter, a speed sensor, a controller and the like. Through the specific arrangement of the crown block power system and the arrangement of the beam part fixing mechanism, the beam part can move up and down and can be adjusted to a proper horizontal position for longitudinal movement and transverse movement, the gravity G of the beam part can be obtained through the weight sensor, then the angle value alpha of the bridge girder erection machine is measured through the gradienter. According to different alpha and G values, the height of the bridge girder erection machine can be adjusted. The speed of longitudinal movement and transverse movement can be adjusted in real time by co