STOOL INSTALLED ON OFFSHORE FLOATING BODY STRUCTURE

To provide an offshore floating body structure which allows arrangement on a top side to be freely set/changed in a vessel longitudinal direction without performing any reinforcement work even after completion of vessel construction, and in which design and construction of a vessel itself are not affected by any change in the arrangement on the top side or weight.SOLUTION: An offshore floating body structure 10 is, for example, a Floating Production, Storage and Offloading system (FPSO), which allows production equipment 14 to be installed on an upper deck 12. The offshore floating body structure 10 comprises: longitudinal bulkheads 18 longitudinally extending and connected to a lower surface of the upper deck 12. An upper surface of the upper deck 12 connected with upper side parts 18A of the longitudinal bulkheads 18 is used as a stool installation part on which stools 16 for supporting the production equipment 14 can be installed. The upper side parts 18A of the longitudinal bulkheads in a position where the stool installation part is provided, are configured of steel products with thickness of 25 mm or more.SELECTED DRAWING: Figure 2 【課題】船体建造後においても、補強作業等を行わずにトップサイドの配置を船長方向に自由に設定／変更でき、トップサイドの配置や重量等が変更になっても船体自身の設計や建造への影響がない洋上浮体構造物を提供することを目的としている。【解決手段】洋上浮体構造物１０は、上甲板１２上に生産設備１４を搭載できる例えばＦＰＳＯ（浮体式生産貯蔵積出設備）である。洋上浮体構造物１０は、長手方向に延在し、上甲板１２の下面に接続される縦通隔壁１８を備える。縦通隔壁１８の上辺部１８Ａが連結される位置の上甲板１２の上面を、生産設備１４を支持するためのスツール１６を設置可能なスツール設置部とする。スツール設置部が設けられた位置の縦通隔壁の上辺部１８Ａを２５ｍｍ以上の厚さの鋼材から構成する。【選択図】図２