Bottom supporting and docking mechanism for bridge erecting machine for bridge fabrication construction

The utility model discloses a bottom support butt joint mechanism for a bridge construction bridge erecting machine, which comprises butt joint U-shaped frames and butt joint hole grooves, the butt joint hole grooves are arranged on frames of the butt joint U-shaped frames, the butt joint hole grooves are installed between the butt joint U-shaped frames, fastening bolt bodies are installed on the frames of the butt joint U-shaped frames in a penetrating mode, and the fastening bolt bodies are fixed on the butt joint U-shaped frames. And a square groove is formed in the surface of the head of the fastening bolt body, a fixing square block is installed on the outer surface of a frame of the butt-joint U-shaped frame, an adjusting shaft column is installed on the fixing square block in a penetrating mode, and a limiting connector is installed at one end of the adjusting shaft column. According to the bottom supporting and docking mechanism for the bridge erecting machine for bridge construction, after a fastenin