Disclosed is a lightweight tire shuttering member for cast-in-situ concrete, comprising a polyhedral solid lightweight material member (1), characterized in that the polyhedral solid lightweight material member (1) is arranged on the longitudinal bar-shaped bottom board (20), thereby forming an inner rib molding chamber (19), the invention can be applied to cast-in-situ reinforced concrete or prestressed reinforcement concrete's storied-building roofings, house roofings, walls, foundation bedplates and bridges, especially for flat slabs.

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