The present invention relates to a light permanent mould body for filling concrete. It is characterized by that at least one turning corner position of external surface of said mould body has an internal corner, the axis of said internal corner is parallel or perpendicular to the axis of stiffening rib or/and stiffening bar or/and reinforcing bar or/and hole. Said mould body is used for in-situ casting various concrete floors, roofs, wall body and buildings of road-bridge engineering. Specially, it is used for in-situ casting hollow beamless floor. |