JPH0732375Y2 - Floating offshore structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a floating offshore structure applied to a floating plant or the like.

[Prior Art] FIG. 7 shows an example of a conventional ship-type floating offshore structure, and shows an overall perspective view thereof.

In the figure, hull 08 is a single-point mooring buoy 09 and mooring line 01.
It is held in the operating area by a one-point mooring system consisting of 0, mooring yoke 011 and the like. A ballast tank, an oil storage tank, etc. are installed inside the hull 08, and an equipment 012 for oil production is mounted on the deck of the hull 08. In order for various equipments for oil production to operate normally, it is necessary for the hull 08 to sway in the waves within the limits. Therefore, the operating rate of this system largely depends on the swaying performance of the hull 08 in waves.

[Problems to be solved by the invention]

However, the floating type offshore structure of the conventional ship type has a low occupancy rate and is not suitable for operation in a severe sea area because the sway of the hull in the waves is relatively large. On the other hand, in order to keep the operating rate large, it is necessary to use a hull having an unnecessarily large amount of drainage in view of the capacity of equipment, tanks, etc. mounted, which is economically problematic.

The present invention is intended to solve the above drawbacks, and an object of the present invention is to provide a floating offshore structure in which the operation rate in rough seas is improved by reducing the motion of the ship in waves. .

[Means for solving problems]

For this reason, the floating offshore structure of the present invention comprises a submersible body and at least one column standing upright on the submersible body, crossing the waterline surface, and narrower than the submersible body. The submerged body projects outward and horizontally from the outer peripheral surface of the column, and the inside of the submerged body is opened inside the column with its upper part open to the atmosphere and its lower part smaller than its waterline area. It is characterized in that at least two internal water compartments are provided in the front-rear direction that communicate with the external water via the water conduit that extends through.

[Action]

With the above configuration, the cross-sectional area of the water inlet is made smaller than the waterline area of the internal water compartment, and the width of the submersible body is made wider than the width of the column to provide a horizontal protruding portion in the water, thereby making the structure vertically It functions as a shaking water tank and shaking fins against shaking. Furthermore, by arranging a plurality of internal water compartments in the front-rear direction of the structure, a damping effect against pitching also occurs.

〔Example〕

1 to 6 show an embodiment of the floating type offshore structure of the present invention, FIG. 1 is a plan view showing the first embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. Fig. 3 shows III-III of Fig. 1.
4 is a sectional view taken along line IV-IV in FIG. 1, FIG. 5 is a plan view showing a second embodiment of the present invention, and FIG. 6 (a).
(B) shows the graph which compared the wave sway performance of this invention with the conventional example, respectively.

In the first embodiment, a column 2 is connected to the upper part of the submersible body 1. The submerged body is formed so that the entire circumference is wider than the width of the column, and the submerged body is provided with a protruding portion in the horizontal direction in the water. There is an internal water compartment 5 inside the column 2, and the internal water compartment 5 is in communication with external water by a water guide port 4 at the bottom thereof. The cross-sectional area of the water guide port 4 is made smaller than the water line area of the water line surface 7 of the internal water section 5, and when the hull sways up and down, the water line surface 7 of the internal water section 5 and the external water line surface 6 are A phase difference of the water level fluctuation occurs between them, and the effect of reducing the vertical fluctuation occurs. By arranging the plurality of internal water compartments 5 in pairs in front of and behind the column 2, there is also a swinging effect on pitching. These can significantly reduce the wave motion of the hull in combination with the effect of reducing the wave external force due to the submersible body 1 and the column 2 having a semi-submersible shape in which the hull is formed wider than the width of the column. It will be possible.

In FIG. 1 and FIG. 5, the ends of the submersible body 1, the column 2 and the like are formed by curved surfaces, but they can also be formed by linear planes for simplification. Further, as shown in FIG. 5, it may be considered that a second embodiment is constituted by a plurality of columns 2 '.

6 (a) and 6 (b) respectively show a comparison between the present invention and the conventional example in which the horizontal axis is the wave period and the vertical axis is the vertical oscillation amplitude / wave amplitude and the vertical oscillation amplitude / wave amplitude. .

[Effect of device]

As described above in detail, the floating offshore structure of the present invention is significantly less swaying in waves compared to the conventional example, can be operated in rough seas, and improves the annual operating rate. Has the effect of.

[Brief description of drawings]

1 to 6 show an embodiment of the floating offshore structure of the present invention, and FIG. 1 is a plan view showing the first embodiment of the present invention,
2 is a side view thereof, FIG. 3 is a sectional view taken along line III-II of FIG. 1, FIG. 4 is a sectional view taken along line IV-IV of FIG. 1, and FIG. 5 is a second embodiment of the present invention. 6A and 6B are plan views showing
Each of them shows a graph comparing the swaying performance in waves of the present invention with a conventional example. FIG. 7 is an example of a conventional ship type floating offshore structure, and shows an overall perspective view thereof. 1 ... Submerged body, 2,2 '... Column, 4 ... Water inlet, 5 ...
… Inner water compartment, 6,7 …… water surface.

Claims (1)

[Scope of utility model registration request] 1. A submersible body and at least one column standing upright from the submersible body, crossing the water line surface and narrower in width than the submersible body, wherein the submersible body is an outer peripheral surface of the column. A water inlet that projects more outwardly and horizontally, has the upper part open to the atmosphere inside the column, and has the lower part smaller than the waterline area inside the column to penetrate the inside of the submerged body. A floating marine structure comprising at least two internal water compartments in the front-rear direction that communicate with external water via water.