Working system for floating structure, floating structure, working ship, and working method for floating structure

A floating type floating structure comprising:

• a column section whose peripheral surface is located at a waterline when the floating structure is floating;
• a ballast section arranged below the column section;
• and
• a flange section arranged at an intermediate portion of the column section,
• wherein the flange section constitutes an engagement section for securing the floating structure in a floating state to a working ship.

A working ship for performing at least installation or maintenance of a floating type floating structure, comprising:

• a gripping section capable of engaging with the floating structure;
• and
• a raising/lowering device capable of adjusting height of the gripping section from a water surface,
• wherein the gripping section is raised relative to the water surface by the raising/lowering device to secure the floating structure in a floating state to the gripping section.

A working method for performing work including at least installation or maintenance of a floating type floating structure on water, comprising:

• an engaging process of engaging a working ship with part of the floating structure;
• a securing process of securing the floating structure to the working ship by raising or lowering the floating structure or the working ship;
• and
• a working process of carrying out the work with respect to the floating structure.