METHOD FOR INSTALLING FLOATING BODY

PROBLEM TO BE SOLVED: To provide a method for installing a floating body which employs an assistant system which can sufficiently assist work of towing, installing and the like of a tension-mooring floating body by a temporarily-disposed assistant floating body, when carrying out at least one work of towing work, installing work, maintenance and checking work and removal work of the floating body of a tension-mooring floating body system.SOLUTION: The method for installing a floating body comprises using an assistant system which is provided with a temporal mooring system for temporarily mooring a floating body 12 of a tension-mooring floating body system 1 and has an assistant floating body 20 temporarily fixed to above-surface mooring parts 12d of the floating body 12, so as to settle a water-bottomed member 14 for fixation to which the lower end of a tension-mooring cable 13 is moored by the temporal mooring system down to a water bottom 2, carry out mooring with the tension-mooring cable 13 after temporarily mooring the assistant floating body 20 and release the temporal mooring after carrying out mooring with the tension-mooring cable 13, in a water area for installing the floating body 12 when installing the floating body 12. 【課題】緊張係留浮体システムの浮体の曳航作業、設置作業、保守点検作業、撤去作業の少なくとも一つの作業を行う場合に、一時的に配置される支援用浮体により、緊張係留浮体の曳航及び設置等の作業を十分に支援できる支援用システムを用いた浮体の設置方法を提供する。【解決手段】緊張係留浮体システム１の浮体１２を仮係留するための仮係留システムを備えて形成され、浮体１２の水面上係留部１２ｄに一時的に固定される支援用浮体２０を有する支援用システムを用いて、浮体１２の設置に際して、浮体１２の設置水域において、仮係留システムにより緊張係留索１３の下端が係留される固定用沈底部材１４を水底２まで沈下させて、支援用浮体２０を仮係留した後に、緊張係留索１３による係留を行い、この緊張係留索１３による係留をした後に、仮係留を解除する。【選択図】図５