The design of steel structure construction drawing of column system of a hot rolling project in Tianjin is as follows: the steel structure construction drawing of column system of a hot rolling project in Tianjin The multi span steel structure frame system columns used in the plant are stepped columns, the upper column is of solid web I-shaped section, and the lower column is of lattice type. The column adopts single web shoulder beam, and the column base adopts inserted column base. The longitudinal column bracing adopts the "K" type. The column top pressure bar and upper column support adopt double channel steel, and the lower column support adopts welded steel pipe. The drawings include: general description, three-dimensional renderings of column system, layout plan of column system, longitudinal section view of column system, transverse section view of column system, details, part drawings of upper column support and column top pressure bar, totally 35 drawings.