| 摘要 |
PURPOSE:To a light-weight structure such as jack house, etc., by a method in which first projected lines are provided on both sides of each cord, a second projected line is provided to the outside of the center crossingly to the first projected lines, and vertical grooves are provided in the upper and lower guides. CONSTITUTION:A leg member 6 consists of four cords 3, many horizontal parts, and many inclined parts. Semi-circular parts 22 and first projected parts 23 are formed on both sides of the plate 21 of the cord 3, and a second projected part 24 is attached to the outside of the central part of the cord 3 crossingly to the plate 21. Recessions 31 through which the semi-circular parts 22 are passed are provided in the upper and lower guides 12 and vertical grooves 32 are also formed. Reaction to be acted when using the landing type offshore working platform of such a simple structure can be received by all the guides. |
