Stair interlayer rest platform plate reinforced by combined steel beams and construction method of stair interlayer rest platform plate

The invention relates to a stair interlayer rest platform plate reinforced by combined steel beams and a construction method of the stair interlayer rest platform plate. The stair interlayer rest platform plate comprises the combined steel beams, I-shaped steel beams, anchor bolts, batten plates, original longitudinal walls and original wall bodies. The combined steel beam is composed of channel steel and batten plates and arranged on the lower portion of a stair interlayer rest platform plate and the upper portion of an original wall body after a certain upper space is removed. The original wall bodies are distributed on the two sides of the stair interlayer rest platform plate and used for bearing the load of the stair interlayer rest platform plate. The original longitudinal wall is a structural bearing wall and bears part of load of a stair interlayer rest platform plate. According to the stair inter-layer rest platform plate reinforced by the combined steel beams and the construction method of the stair