Formwork-free ultra-thick floor and construction method thereof

The invention discloses a formwork-free ultra-thick floor which is provided with a bottom plate. The bottom plate is formed by splicing a plurality of steel plates, a plurality of steel sections are fixed to the steel plates at intervals, a first steel channel is connected between every two adjacent steel sections on each steel plate, and the first steel channels are connected to the upper portions of the steel sections; and concrete is poured on the bottom plate. In one embodiment, hanging bars are connected between the adjacent steel sections, a splicing joint between every two adjacent steel plates is covered with flat steel, and the two sides of the flat steel are welded to the corresponding steel plates. In the other embodiment, a second steel channel is welded between every two adjacent steel sections, the second steel channels are connected to the lower portions of the steel sections, and a third steel channel is welded between the steel sections on the two sides of a splicing joint of every two adjace