Conversion device for stiff structure and steel structure

The utility model belongs to the technical field of building engineering equipment, and relates to a conversion device for a stiff structure and a steel structure, wherein a main body structure comprises the stiff structure, a conversion unit, a box-shaped steel structure, anti-shear cotters, a stiff steel rib and a stiffening rib; the stiff structure is fixedly connected with the box-shaped steel structure via the conversion unit; one section of the stiff steel rib extends from the stiff structure and enters in the box-shaped steel structure; the box-shaped steel structure is externally wrapped on the stiff steel rib with an H-shaped structure and fixedly connected via the stiffening rib; the common anti-shear cotters are produced on the inner wall of the box-shaped steel structure and the steel web of the stiff steel rib; and concrete is poured at the fixed place of the conversion unit with a sleeve-joint structure according to the construction mode of the stiff structure, thus realizing fixed conversion from the stiff structure to the box-shaped steel structure. The conversion device is simple in the main body structure, reliable in design principle, simple and convenient in construction process, good in reinforcing quality, high in benefit, and wide in application range.