Multilayer longspan assembled integral space steel grid building structure

The utility model discloses a multilayer longspan assembled integral space steel grid building structure which is used as a chord member of a double-layer cross assembly unit of an assembled integral flat plate or curved surface steel empty grid structure of a floor or roof structure and fixedly connected to an upright post used as a steel grid bearing outer wall structure. The steel grid bearing outer wall structure is a column grid structure which is formed by connecting upright posts and transverse beams, wherein each upright post is formed by a rectangular steel tube or made of H-shaped steel, each transverse beam is made of H-shaped steel or T-shaped steel, the height or width of the cross section of the rectangular steel tube is 200 mm to 300 mm, and the wall thickness of the rectangular steel tube is 4 mm to 10 mm. According to the column grid structure, the center distance between every two adjacent upright posts is 1500 mm to 4000 mm, five transverse beams are horizontally connected between every two adjacent upright posts, and the center distance between every two adjacent transverse beams is 500 mm to 2500 mm. The multilayer longspan assembled integral space steel grid building structure has the advantages of light weight, high strength, easiness in construction, good quality and the like.