Prefabricated concrete ribbed hollow structure

The utility model discloses a precast concrete ribbed hollow structure, which belongs to the technical field of building construction, and comprises a heat insulation board and two protective panels symmetrically adhered to two side walls of the heat insulation board, the interior of the heat insulation board is hollow, one side wall of one protective panel back to the heat insulation board is fixedly connected with two U-shaped ribbed plates, and the other side wall of the protective panel back to the heat insulation board is fixedly connected with a steel plate. Two rotary knobs are rotationally connected to the side wall, facing the heat preservation plate, of each rib plate, two movable grooves are symmetrically formed in the side wall, back on to the heat preservation plate, of each rib plate, screw rods are rotationally connected into the two movable grooves, and the two screw rods on the rib plates are coaxially connected with the two rotary knobs correspondingly; the two screw rods are both sleeved wi