Large-span door-shaped support spanning structure

The utility model provides a span structure large span portal support which comprises two stand column pre-embedded steel plates, two straight stand columns, two inclined stand columns, a supporting transverse pipe and a bailey group beam, the two stand column pre-embedded steel plates are symmetrically arranged on the two sides of a structure, the two straight stand columns are arranged on the two stand column pre-embedded steel plates respectively, and the two inclined stand columns are arranged on the two stand column pre-embedded steel plates respectively. One ends of the two inclined stand columns are fixed to the stand column embedded steel plates respectively, the other ends of the two inclined stand columns are fixedly connected with the supporting transverse pipes, and the bailey group beams are installed on the tops of the straight stand columns and the tops of the supporting transverse pipes. The structure-spanning large-span door-shaped support comprises the two stand column embedded steel plates,