Industrial-assembly multi-high-layer steel framework system

The invention relates to an industrial-assembly multi-high-layer steel framework system, and belongs to the technical field of building construction. The system comprises a steel-structure main body plate frame and a pillar system, wherein the steel-structure main body plate frame comprises base plate frames and floor slabs; and the pillar system comprises pillars and pillar cover plates. Wide girders, narrow girders and the floor slabs are made into one piece in plant, and the wide girders and the narrow girders are both formed by welding angle steel or channel steel in a plant. A pipeline passes through web plate channel steel of the wide girders and the narrow girders, to form an A base plate frame, a B base plate frame and a C base plate frame. High strength bolt connection and partial welding are adopted at the connections between the base plate frames and pillar seats and at connections between the wide girders and the narrow girders (only restricted to plant). The pillar seats and the pillars are in flanged connection by using bolts. By adopting the industrial-assembly multi-high-layer steel framework system, the strength of the materials can be given full play, the horizontal load is effectively countered, the displacement between structural layers is reduced, the environment pollution caused by welding is reduced, the project construction speed is increased, and the cost is saved.