Composite beam comprising steel ring tenon and U-shaped stud combined connecting piece

The utility model relates to a composite beam containing a steel ring tenon and U-shaped stud combined connecting piece. The composite beam comprises a steel beam and a concrete plate, an upper flange is arranged on the steel beam, a penetrating reinforcing steel bar is arranged in the concrete plate, a perforated steel plate is arranged on the upper flange, a pouring cavity is machined in the concrete plate, and a containing hole is machined in the perforated steel plate. The concrete slab has the advantages that the concrete slab is hoisted to the position above the upper flange, the positioning plate can position the concrete slab to a certain degree, the second connecting holes are aligned with the first connecting holes, assembling is convenient, the penetrating reinforcing steel bars with the steel ring tenon pieces are placed in the containing holes, the U-shaped stud pieces are fixedly connected into the second connecting holes and the first connecting holes, and the concrete slab is fixed to the uppe