Connecting structure of barrage foundation diaphragm wall and gate dam building

The utility model discloses a connecting structure of a barrage foundation diaphragm wall and a gate dam building. The connecting structure comprises the foundation diaphragm wall, the gate dam building and a riverbed concrete cushion layer. A high-foaming polyethylene plate and a precast concrete trough plate are arranged between the top face of the foundation diaphragm wall and the gate dam building from bottom to top in sequence. Clearances are arranged between the upstream surface and the downstream surface of the foundation diaphragm wall of the connecting position of the foundation diaphragm wall and the gate dam building, a U-shaped copper water stop is buried in the middle of the clearance of the upstream side, and water stop pieces on the two sides of the water stop nose of the U-shaped copper water stop respectively extend to the inner portion of the foundation diaphragm wall and the inner portion of the gate dam building. A chloroprene rubber bar is arranged in the cavity of the water stop nose, po