Anti-floating composite light mandrel for cast-in-place open-web floor and manufacturing method thereof

The invention belongs to the technical field of building floor, in particular to an anti-floating composite light mandrel for a cast-in-place open-web floor and a manufacturing method thereof. The mandrel comprises a top plate, a lateral plate, a bottom plate, a horizontal through hole and a light inner core, the top plate, lateral plate and bottom plate form a closed high-intensity thin-wall die box in a surrounding mode, the light inner core is filled in the die box, the phenomenon that concrete is filled into the die box due to the fact that a vibrating spear breaks the die box in the concrete vibrating process can be avoided, and the horizontal through hole in the bottom plate is convenient for locating the mandrel on rib beam steel or floor bottom die after an anti-floating reinforcing steel bar punches a hole. The anti-floating composite light mandrel is simple in structure and featured with light weight, large hardness, good sound insulation, extrusion resistance, crack resistance, vibration resistance and the like after being used for the building floor.