JP3001984U - Offshore structure - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] An ocean that enables good construction against the conditions of the installation sea area such as shallow sea area, soft ground, ice sea area, which was difficult to cope with with conventional platforms. The purpose is to provide a structure. [Structure] A shaft structure 1 erected on a bottom plate 11, a substantially conical outer wall rotatable about the shaft structure, a buoyancy adjusting chamber 3 formed in the outer wall, and a buoyancy adjusting chamber in the buoyancy adjusting chamber. The marine structure is composed of a means for taking in water and discharging it to the outside and a means for injecting water or air provided on the outer wall.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an energy-related facility such as power generation and oil drilling, and an offshore structure that can be used as various storage facilities.

[0002]

[Prior art]

 After constructing a box structure such as an offshore platform in a dock, it will be towed, sunk, and installed on the ground before carrying out equipment work and starting operation.

[0003]

[Problems to be solved by the device]

 The above conventional technique has the following problems. <B> It is necessary to secure a certain degree of draft during the towed body navigation, and it is impossible to towed in extremely shallow waters. <B> When installing on soft ground, a large settlement will occur unless the weight of the box is reduced. <C> Since it is covered with drift ice in winter, it must have an ice-resistant structure. It is difficult to build a structure with the above functions with a conventional platform.

[0004]

[Means for Solving the Problems]

 The present invention has been made in order to solve the above problems, and it can be applied to the conditions of shallow sea areas, soft ground, and ice sea areas, which were difficult to cope with with conventional platforms. The aim is to provide offshore structures that enable good construction. That is, the present invention is directed to a shaft structure erected on a bottom plate, a substantially conical outer wall rotatable about the shaft structure, a buoyancy adjusting chamber formed in the outer wall, and a buoyancy adjusting chamber. It is a marine structure comprising means for taking water in and discharging it to the outside and means for injecting water or air provided on the outer wall.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. <A> Shaft Structure As shown in FIG. 1, the shaft structure 1 is a structure such as a cylindrical core erected on the bottom plate 11. Inside the shaft structure 1, there is a storage space for mounting work equipment and the like.

<B> Inclined Outer Wall The inclined outer wall 2 is a substantially conical body rotatable about the shaft structure 1. For example, as shown in FIGS. 1 and 2, the shaft structure 1 is arranged in a divergent shape from slightly below the upper end, and an injection chamber 21 is defined in the lower end peripheral portion thereof. The contact portion 22 between the shaft structure 1 and the upper end of the inclined outer wall 2 and the contact portion 23 between the shaft structure 1 and the injection chamber 21 are configured to be slidable by interposing a roller or the like, and a stopper such as a rubber plate is also provided. Arrange water materials and apply water stop processing.

<C> Injection Device As shown in FIG. 1, a large number of injection ports 24 are opened on the bottom surface of the injection chamber 21 of the inclined outer wall 2. In addition, an injection unit 25 such as an injection pump that injects water or air is installed in the injection chamber 21. By operating the injection unit 25, water or air can be injected from the injection port 24.

<D> Buoyancy Adjustment Chamber The inside of the inclined outer wall 2 is hollow, and the hollow portion is used as the buoyancy adjustment chamber 3. A pump 31 is installed in the buoyancy adjusting chamber 3 so that water can be taken into the buoyancy adjusting chamber 3 and discharged to the outside. By adjusting the amount of water ballast in the buoyancy adjusting chamber 3 in this manner, the weight of the structure can be appropriately selected. The inside of the buoyancy adjusting chamber 3 can be effectively used as a storage room or the like.

[0009]

[Construction method]

 As shown in Fig. 1, the water ballast in the buoyancy adjusting chamber 3 is discharged, and the structure is given buoyancy and towed to the site. After arriving at the site, as shown in FIG. 3, the buoyancy adjusting chamber 3 is filled with water ballast and gradually submerged in water. For example, the upper end of the permanent anchor 4 is fixed to the bottom plate 11 and the lower end is fixed to the seabed support layer. In this case d, the buoyancy acting on the structure is set to always exceed the sum of the self-weight of the structure and the top load, and the bottom of the structure and the sea bottom are not in contact with each other, and they are always installed in a floating state. As shown in FIG. 4, a pile 5 may be driven in place of the permanent anchor 4 on the seabed and the structure may be fixed to the upper end of the pile 5.

[0010]

[Action]

 Next, the operation when the structure of the present invention is used will be described. <B> By adjusting the buoyancy of the structure by the buoyancy adjusting chamber 3, the distance between the bottom of the structure and the sea bottom can be kept constant without being affected by the tidal level fluctuation. Therefore, even if the seabed is soft ground, it is possible to prevent the structure from sinking.

<B> When the structure swings due to waves or the like, as shown in FIG. 3, air or water is jetted in a predetermined direction from the jet port 24 of the slanted outer wall 2 at a predetermined position, and the shaft is rotated. By rotating the inclined outer wall 2 about the structure 1, the position of the structure can be controlled.

<C> In winter, there is a risk that ice floes will collide with the sloped surface of the slanted outer wall 2, so that the pieces of drift ice that have run up can be destroyed by bending. Further, by rotating the inclined outer wall 2, it is possible to prevent ice from adhering to the inclined outer wall 2.

[0013]

[Effect of the present invention]

 Since the present invention has been described above, the following effects can be obtained. <B> In shallow water, sufficient buoyancy can be secured for the structure, so it is possible to easily tow the site and improve the construction efficiency.

<B> Since the weight of the structure can be adjusted, the weight can be set so that it can be submerged in water and does not sink to the ground. Therefore, it is possible to efficiently perform the sinking work and prevent the occurrence of sinking, and it is possible to deal with the construction on soft ground.

<C> Since the adhesion and the like of drift ice can be prevented by the inclination and rotation of the outer wall, it is possible to take sufficient measures against the winter season.

[Brief description of drawings]

FIG. 1 is a side sectional view of the structure of the present invention.

[Figure 2] Plan view

[Fig. 3] Illustration of construction method

[Figure 4] Illustration of other construction methods

Claims (1)

[Scope of utility model registration request] 1. A shaft structure erected on a bottom plate, a substantially conical outer wall rotatable about the shaft structure, a buoyancy adjusting chamber formed in the outer wall, and water in the buoyancy adjusting chamber. A marine structure comprising a means for taking in and discharging the water and an ejecting means for water or air provided on the outer wall.