Overpass type three-way bridge

An overpass type three-way bridge comprises a longitudinal through opening, a transverse left through opening and a transverse right through opening. The longitudinal through opening is provided with three wire insertion openings, and the transverse left through opening and the transverse right through opening are respectively provided with three wire outlets corresponding to the longitudinal through opening. Three channels, a long bridge channel and a short bridge channel which are communicated with the through opening are arranged in the bridge frame, and the same special wire passes through the same channel. The short bridge road spans the first channel to form a first bridge opening, and the long bridge road spans the second channel to form a second bridge opening. A wire of the first insertion port is directly arranged leftwards in the first channel and needs to penetrate through the first bridge opening rightwards. A wire of the second insertion port passes through the short bridge road, is directly pro