Mortise system which is recently implemented without reserving anti-floating condition for existing structure of subway station

The utility model relates to a mortise system for recently implementing an existing structure of a subway station without reserving an anti-floating condition, which is positioned below a bottom plateof a long-term station and comprises an existing station fender post, a post-cast crown beam and an anti-floating mortise, post-cast crown beams are arranged at the tops of the existing station fender posts, and the width of the post-cast crown beams is larger than that of the existing station fender posts; l-shaped anti-floating mortises are formed in the lower portion of the long-term station bottom plate, and the ends of the post-cast crown beams are inserted into the anti-floating mortises to form an L-shaped meshed anti-floating combined structure. According to the utility model, the existing fender posts and the long-term station bottom plate are modified; long-term station bottom plate steel bar binding and concrete pouring are perfected, fender posts are prevented from being anchored into a bottom plate i