Steel truss girder all-welded joist slice and construction method thereof

The invention relates to a steel truss girder all-welded joist slice and a construction method of the steel truss girder all-welded joist slice. A top chord rod is welded at two ends of two top chord whole nodes and the middle of the two top chord whole nodes to form a whole top chord rod, a lower chord rod is welded at two ends of two lower chord whole nodes and the middle of the two lower chord whole nodes to form a whole lower chord rod, and the upper end and the lower end of a diagonal and the upper end and the lower end of a montant are respectively welded with the whole nodes of the whole top chord rod and the whole nodes of the whole lower chord rod. The construction method includes that two intermodes of the top chord is constructed as a whole top chord rod, two inermodes of the lower chord is constructed as a whole lower chord rod, and the montant and the diagonal in two intermodes are connected with the whole nodes of the whole top chord rod and the whole lower chord rod in a welding mode. The steel truss girder all-welded joist slice has the advantages of being capable of reducing splicing of construction plants and workload of welding, being high in working efficiency and rapid in construction schedule, guaranteeing quality, saving materials due to the reduction of the splicing of a segment of a main truss, reducing a lateral construction plant weld joint of a deck slab and slicing of a longitudinal rib, and being high in work efficiency. The steel truss girder all-welded joist slice is capable of being used for steel truss girders of bridges such as a simple support steel truss girder, a consecutive steel truss girder and a steel truss girder cable-stayed bridge in roads and railways.