Disclosed is a hollow carcass for filling cast-in-situ concrete, which comprises a hollow carcass, a bracing strut, wherein the bracing strut (2) is arranged on the outer wall of the floor surface (3) of the hollow carcass (1), the outer wall (3) encloses the hollow carcass (1) formed with a cavity (4), characterized in that at least one position of the outer wall (3) of the hollow carcassa (1) is provided with a cushion strip (5) or cushion block (6) of the reinforcing bar, thus the reinforcing bars in the storied building's covers can be elevated to keep a right distance between the reinforcing bars and the hollow carcass. After the concrete cast-in-situ operation, the reinforcing bars can be fully encircled by the cast-in-situ concretes, the casting quality for the cast-in-situ concrete hollow building slab can be guaranteed, corrosion of the reinforcing bars can be prevented effectively. Furthermore, The hollow carcass also has the advantages of simple structure, high intensity, good deformation resistance, fine vibration resisting performance, easy manufacture, convenient construction work, and rapid construction speed. the invention can be applied to cast-in-situ reinforced concrete or prestressed reinforcement concrete's hollow boards, storied building covers, house roofing, walls, foundation bedplates and bridges, especially for hollow flat slabs. |