Post-cast strip device and construction method thereof

The invention discloses a post-cast strip device which comprises a foundation base plate. A reinforcement cage is welded inside the foundation base plate. The reinforcement cage comprises a main rib framework composed of a plurality of main ribs, and waist ribs are arranged between the main ribs of the main rib framework and comprise vertical waist ribs and longitudinal waist ribs, wherein the vertical waist ribs and the longitudinal waist ribs are connected between the main ribs. A plurality of symmetrical water stopping steel plates are further longitudinally arranged on the two sides of the reinforcement cage, and the outer surface of the reinforcement cage is further provided with a closing net. The two sides of the reinforcement cage are fixed at the position of a welding point of a lower base plate of the foundation base plate through a plurality of symmetrical fixing tie bars. The post-cast strip device has the advantages that the step of dismantling formworks and a supporting system on the two sides of a post-cast strip after the construction of the base plate is omitted, the hidden danger of water leakage of the post-cast strip is avoided, wood and revolving materials are saved, steel bar processing leftovers are fully utilized, and the steel bar waste is reduced. The hidden safety danger of operation in a narrow space by constructors is avoided, and the construction quality of the post-cast strip is enhanced.