Hanging-type caisson device

The invention relates to a hanging-type caisson device which is arranged surrounding a to-be-repaired pier column. The hanging-type caisson device comprises a sealed-bottom conical steel box and a circular steel molding box, wherein the sealed-bottom conical steel box is connected with the circular steel molding boxy by virtue of a bolt; the circular steel molding box is connected to the pier column by virtue of a hanger, the hanger is connected with the circular steel molding box by virtue of an unlocking device, and the hanger is fixed on the pier column by virtue of a reinforcing steel bar with threads; a water stop rubber band is arranged between the bottom of the bottom conical steel box and the pier column. Bottom sealing concrete is also arranged between the bottom of the sealed-bottom conical steel box and the pier column. A baffle plate is also arranged between the bottom of the bottom conical steel box and the pier column. The sealed-bottom conical steel box is also provided with a valve which is used for regulating the pressure and the water. By adopting a novel suspension method, the problem for reinforcing a bridge pier in the water can be solved, the cost is low, and the effect is good.