And buoyancy tank system is used for adjusting pressure of underwater cofferdam base

The utility model discloses a buoyancy tank system for adjusting underwater cofferdam base pressure, which comprises a buoyancy tank arranged on the surface of a cofferdam and close to the bottom areaof a canal, and the buoyancy tank is communicated with an automatic inflating and deflating mechanism arranged on the bank side of the canal through an air pipe. The buoyancy tanks comprise the firstbuoyancy tanks arranged on the top face of the cofferdam in rows in the downstream direction and the second buoyancy tanks arranged on the slope faces on the two sides of the cofferdam in the direction perpendicular to the water flow direction. Resistance of the buoyancy tank to channel water flow can be reduced as much as possible, connection of the buoyancy tank and the cofferdam is facilitated, and the position of the buoyancy tank is flexibly adjusted. The anti-sliding stability of the cofferdam can be improved, the pressure on a foundation needs to be reduced during normal operation after the cofferdam is install