Combined open caisson structure

The utility model relates to a combined open caisson structure, and relates to the field of open caissons, the combined open caisson structure comprises an open caisson, the open caisson comprises a plurality of sections of well walls, the well walls are of vertically-arranged cylindrical structures, clamping grooves are formed in the top ends of the well walls in the circumferential direction of the well walls, the longitudinal sections of the clamping grooves are trapezoidal, and the width of the top ends of the clamping grooves is larger than that of the bottom ends of the clamping grooves; clamping parts are arranged at the bottom ends of the well walls in the circumferential direction of the well walls, the clamping parts are used in cooperation with the clamping grooves, the well walls can be connected through the clamping parts and the clamping grooves, and the axes of the multiple sections of well walls are the same; connecting assemblies are arranged on the well walls and used for connecting the two