The invention belongs to the technical field of foundation structures of oceanographic
engineering, and discloses a multi-cylinder combined foundation structure and a construction method thereof. Themulti-cylinder combined foundation structure comprises multiple
steel cylinder foundations, wherein the central points of the
steel cylinder foundations are connected to form a regular polygon; a steel top plate is connected to the upper portions of the multiple
steel cylinder foundations, a concrete plate is arranged on the steel top plate, and a beam plate
system is distributed on the concrete plate; and a concrete transition section is located on a central ring beam, a steel
tower cylinder is connected to the upper portion of the concrete transition section in an embedded manner, and the upper portion and the lower joint of the steel
tower cylinder make contact with the concrete transition section and inner ring beams through elastic buffer devices. The construction method of the multi-cylinder combined foundation structure comprises the steps of land fabrication,
shore-side hoisting, waterborne
towing, negative pressure sinking, negative pressure reinforcing and the like. The multi-cylinder combined foundation structure has the
advantage of the cylinder foundations, and is wide in application range, convenient to transport and install, recyclable and high in bearing force; andduring construction and operation, an upper load can be transferred to the transition section or the beam plate
system through the elastic buffer devices on the upper portion and the lower portion.