Pre-seal structure of post-subsidence pouring belt and construction method thereof

The present invention relates to a post-subsidence pouring belt pre-sealed structure and a construction method thereof. A post-subsidence pouring belt is constructed at the position of the structure, where the subsidence is not stable, a post-pouring belt moulding board is laid on the bottom surface of the subsidence space in the post-subsidence pouring belt, a steel reinforcement cage is arranged in the subsidence space, a mortar layer is paved along the upper surface and both edges of the post-subsidence pouring belt, and a concrete cover plate laid on the mortar layer is connected with a transition layer, a water-proof layer, a concrete protection layer and backfilled soil in order; a concrete-pouring hole is reserved on the concrete cover plate, a concrete-pouring tube is vertically connected with the concrete-pouring hole, the lower tube orifice of the concrete-pouring tube is inserted into the subsidence space, and the upper tube orifice of the concrete-pouring tube is exposed outside the backfilled soi