JPH0739755Y2 - Floating offshore structure - Google Patents

Description

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

[Conventional technology]

As shown in the overall perspective view of FIG. 5, the conventional ship type floating offshore structure has a hull 9 with a single-point mooring buoy 10 and a mooring line 1.
It is moored in the operating area by a one-point mooring system consisting of 1, mooring yokes 12 and so on.

Here, inside the hull 9, there are ballast tanks, oil storage tanks, etc., and on the deck of the hull 9, equipment for oil production 13
In order to properly operate various equipments for oil production, it is important that the hull 9 is within the limit of swaying in the waves.

In this type of ship-type floating offshore structure, the sway in waves tends to be quite large, so in order to suppress this as much as possible, as shown in the plan view of FIG. 6 and the vertical sectional view of FIG. The hull is a semi-submersible type consisting of a submersible body 1 and a column 2, and a plurality of internal water compartments 3 are provided inside the column 2 to form an anti-sway water tank so that the hull is less swaying in waves. The one that has been proposed.

That is, as shown in the figure, the water inlet 6 is provided in the lower part of the inner water compartment 3 and the lower part of the column 2 at the outer side so that the outer water and the inner water communicate with each other, and the cross-sectional areas of the water inlet 6 are Is smaller than the water line area of the water surface 7 of the inner water compartment 3 and when the hull sways or pitches, a phase difference of water level fluctuation occurs between the water surface 7 of the inner water compartment 3 and the outer water surface 8. ,
As a result, the effect of reducing vertical vibration and vertical vibration is exhibited, and by dividing the internal water compartment 3 into left and right, the same principle is used in the horizontal direction to reduce horizontal vibration.

Furthermore, the swaying of the hull in the waves is significantly reduced in combination with the effect of reducing the wave external force by forming the hull in the semi-submersible shape of the submersible body 1 and the column 2.

[Problems to be solved by the invention]

However, in the floating offshore structure with such a structure, it is necessary to make the water intake area large enough to exhibit the effect of damping, compared with the water line surface area of the internal water compartment. However, opening a large opening in part of the hull has the following problems.

(1) Since the strength of the hull becomes weaker, reinforcement measures are required.

(2) There are restrictions on the onboard layout.

The present invention has been proposed in view of such circumstances, and an object thereof is to provide a floating type offshore structure in which the internal water compartment is used to reduce swing without providing an opening in the hull.

[Means for solving problems]

To this end, the present invention includes a horizontal submerged body extending in the front-rear direction,
A floating marine structure that is erected on the submerged body, penetrates the water surface, has an upper end protruding above the water surface, and has a column that is long in the front-rear direction. A pair of internal water compartments, a communication pipe in the front-rear direction that communicates between the pair of inner water compartments, and a partition plate in the front-rear direction that divides each of the inner water compartments into left and right, respectively.
It is characterized in that each partition plate is provided with a communication hole which is provided in the submerged part and which communicates with the left and right internal water, respectively.

[Action]

With such a configuration, the vertical and horizontal moments due to the difference in water level between the water surfaces of the front and rear compartments and the left and right compartments of the internal water compartment provided in the structure have the effect of reducing sway and enable the sway prevention. .

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a horizontal cross-sectional view taken along the water line, and FIG. 2 is II-II of FIG.
Fig. 3 is a longitudinal sectional view taken along the line
It is a transverse cross-sectional view along III-III, IV-IV.

In the above figure, the same symbols as in FIGS.
~ 7 shows the same members, the column 2 above the submerged body 1
Is established, and the internal water compartments 3 are arranged in the front and rear inside the column 2, and the front and rear inner water compartments 3 are connected to each other by the communication pipes 4 to allow the internal water to move back and forth. Configure a shaking water tank.

In each of the front and rear internal water compartments 3, a partition plate 5 for partitioning the internal water into the left and right is installed vertically on the midline of the hull, and a communication hole 14 is provided in the partition plate 5 so that the internal water can be moved left and right. It is also provided, which also constitutes a U-shaped anti-sway water tank in the left-right direction.

In such a structure, water is put in the inner water compartment 3 in advance by a pump or a valve-equipped external conduit (not shown) to an appropriate water level corresponding to the shaking cycle to be reduced.

Then, when the hull is pitched by making the cross-sectional area of the communication pipe 4 smaller than the water line area of the water surface 7 of the internal water compartment 3 before and after the column 2, the longitudinal movement of the internal water is 90 ° with respect to the pitch. It produces a resonant motion with a delay and acts as a U-shaped damping water tank against the pitching of the hull.

Similarly, the left and right movement of the internal water in each of the front and rear internal water compartments 3 causes a resonance motion having a 90 ° delay with respect to the rolling, and acts as a U-shaped shaking water tank against the rolling. It is possible to remarkably reduce the sway of the hull in the waves in combination with the effect of reducing the wave external force by configuring the hull with the submerged body 1 and the column 2 in a semi-submerged shape.

[Effect of device]

According to such a structure, the anti-sway water tank can be installed without providing an opening in the hull, without any measures for reinforcing the strength of the hull, and without being constrained in the onboard arrangement.
Coupled with the semi-submersible ship type, the shaking in the waves is significantly reduced, which enables operation in rough waters,
The annual operating rate is improved.

In short, according to the present invention, a floating submarine structure comprising a horizontal submersible body extending in the front-rear direction, and a column extending vertically in the front-rear direction while standing upright on the submersible body, penetrating the water surface, projecting the upper end above the water surface. In, at least a pair of internal water compartments arranged in the front-rear direction inside the column, a communication pipe in the front-rear direction that communicates between the pair of inner water compartments, and each of the internal water compartments is divided into left and right. By providing the partition plates in the front-rear direction and the communication holes that are respectively provided in the submerged parts of the above-mentioned partition plates and communicate the respective left and right internal waters, the internal water compartment can be provided without providing an opening in the hull. The present invention is extremely useful industrially because it obtains a floating offshore structure for damping.

[Brief description of drawings]

FIG. 1 is a horizontal plan view of a waterline surface showing an embodiment of the present invention, FIG. 2 is a vertical sectional view taken along line II-II of FIG. 1, and FIGS. It is a cross-sectional view taken along the line III-III, IV-IV of the figure. FIG. 5 is an overall perspective view showing a conventional floating marine structure of a ship type, FIG. 6 is a horizontal cross-sectional view of the waterline showing an example of the marine structure of FIG. 5, and FIG. FIG. 1 ... Submersible body, 2 ... Column, 3 ... Internal water compartment, 4 ... Communication pipe, 5 ... Partition plate, 6 ... Water inlet, 7 ... Water surface (internal water compartment), 8 ... Water surface (external water), 14 ... Communication Hole

Claims (1)

[Scope of utility model registration request] 1. A floating submarine structure comprising a horizontal submersible body extending in the front-rear direction, and a column standing vertically on the submersible body, penetrating the water surface, having an upper end protruding above the water surface, and a column long in the front-rear direction. At least a pair of internal water compartments arranged in the front-rear direction inside the column, a communication pipe in the front-rear direction that communicates between the pair of internal water compartments, and a front-rear portion that divides each of the internal water compartments into left and right. A floating marine structure, comprising: a partition plate in a direction, and communication holes provided in the submerged portions of the partition plates, respectively, for communicating the left and right internal waters.