JP2001213390A - Offshore buoyant body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the bottom face and side faces of a buoyant body structure with adhesion preventing means for disrupting the sedentary environment of ocean organisms with gas. SOLUTION: An inclined bottom face inclined on both sides with a cross direction center part as the top part is formed at the bottom face of this buoyant body structure. A partition plate is fitted along the side face from the inclined bottom face, and the side face is partitioned in a number of zones from the inclined bottom face in the lengthwise direction of the buoyant body structure. Gas such as nitrogen is jetted to each zone from the to part of the inclined bottom face, and the gas ascends in the form of bubbles along the side face from the inclined bottom face of each zone to form a gas layer formed of bubbles on the side face from the inclined bottom face of the buoyant body structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine floating structure, and more particularly to a marine floating structure having means for preventing marine organisms from adhering to the surface.

[0002]

2. Description of the Related Art An marine floating structure floating on the sea (hereinafter referred to as a floating structure) is widely used as a helipad, a marine workbench, a quay in an affected area, or the like.
Recently, ultra-large ones are being developed for use as airports. This floating structure has a problem that marine organisms (such as mussels and barnacles) adhere to the surface under draft.

[0003] Adherent organisms not only adversely affect the floating structure, such as forming marks on the floating structure, causing corrosion. In addition, since the floating structure is used for many years, marine organisms have long been attached and dead shellfish have been used for many years. The repetition of falling will affect the sediment and water quality in the sea area where the floating structure is installed, and may be a factor that changes the marine ecosystem.

[0004] For this reason, it is urgently necessary to provide a means for preventing the attachment of marine organisms to the floating structure, and various experiments and studies have been made. As one method, it is known that forming a gas layer of nitrogen or the like on the bottom surface of a floating structure to destroy an epiphytic environment of marine organisms is effective in preventing adhesion.

As a means for forming a gas layer, the bottom surface of the floating structure is surrounded by a partition plate, and a gas such as nitrogen is supplied thereto and confined between the floating surface and the sea surface to form a gas layer. However, by such means, the gas layer can be formed only on the bottom surface of the floating structure. Therefore, although effective in preventing the floating structure from adhering to the bottom surface, marine organisms adhere to the side surface.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a floating structure with means for preventing adhesion of marine organisms to the bottom and side surfaces thereof.

[0007]

Means for Solving the Problems On the bottom surface of the floating structure, a slanted bottom surface is formed having a central portion in the width direction as a top and inclined on both sides, and a partition plate is attached along the side surface from the slanted bottom surface. The side surface is divided into a number of zones from the inclined bottom surface in the longitudinal direction of the object, and a gas such as nitrogen is jetted from the top of the inclined bottom surface to each zone, and the gas is bubbled up along the side surface from the inclined bottom surface of each zone. A gas layer is formed by air bubbles from the inclined bottom surface to the side surface of the floating structure.

The gas to be jetted is provided with a gas supply device on the floating structure, a gas supply main pipe connected to the gas supply device inside the inclined bottom surface, and a large number of gas supply pipes connected to the gas supply main pipe. And a nozzle with a check valve is mounted on the top of the inclined bottom in a row in the longitudinal direction of the floating structure, penetrating through the inclined bottom, and a nozzle with a check valve is attached to the nozzle with the check valve. The pipes were connected, and the gas sent from the gas feeding device was ejected from the nozzle through the gas supply main pipe and the branch pipe.

A gas supply device is provided on the floating structure, and a gas supply main pipe having nozzles with check valves mounted in a row in the longitudinal direction is provided outside the inclined bottom surface, and the gas supply main pipe is inclined. The gas supply device was connected to the gas supply device by a pipe penetrating the bottom surface, and the gas supplied from the gas supply device was ejected from the nozzle through the gas supply main pipe.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view schematically showing a floating structure according to the present invention, and FIG. 2 is a side view showing a partial cross section of the same. FIG. 3 is a diagram showing the mounting of the nozzle, and FIG. 4 is a schematic front view showing another embodiment of the present invention. 1 is a pontoon type floating structure having a box structure, and the present invention is directed to this pontoon type floating structure.

The bottom surface of the floating structure 1 is formed as an inclined bottom surface 2 having a top in the center in the width direction of the floating structure and inclined to both sides. Reference numeral 4 denotes a partition plate attached along the inclined bottom surface 2 to the side surface 3 of the floating structure 1, and divides the inclined bottom surface 2 to the side surface 3 into a number of zones in the length direction of the floating structure 1. I have.

Reference numeral 5 denotes a main gas supply pipe installed inside the inclined top of the inclined bottom surface 2 corresponding to each zone, and has a large number of branch pipes 6. Reference numeral 7 denotes a gas supply device which includes a nitrogen generator, a compressor, and the like, and is installed on the floating structure 1. The gas supply side of the gas supply device 7 includes a pipe 8
And is connected to the gas supply main pipe 5 through. In addition, the gas supply main pipe 5 and the gas supply device 7 may be arranged for each zone, or may be arranged to be used for a plurality of zones.

9 is a nozzle having a built-in check valve,
It is attached through the inclined bottom surface 2 and is connected to the branch pipe 7. FIG. 3 shows the mounting of the nozzle 9,
(A) is attached to the inclined top of the inclined bottom surface 2 in a line, and the nozzle openings are alternately turned left and right. In (B), nozzles with nozzle openings facing left and right across the top are mounted in two rows.

FIG. 4 shows another embodiment of the present invention. The gas supply main pipe 5 to which the nozzle 9 with a check valve is mounted is arranged outside the inclined bottom surface 2. Nozzle 9 with check valve
Are mounted in two rows in the longitudinal direction so that the inclined top of the inclined bottom surface 2 is sandwiched between the nozzles and the nozzle openings are directed left and right.

The gas supply main pipe 5 is connected to the gas supply device 7 by a pipe 8 ′ penetrating the inclined bottom surface 2. With such a configuration, a large number of branch pipes can be omitted, and the work of mounting a large number of nozzles 9 on the inclined bottom surface 2 of the floating structure 1 having a watertight structure becomes unnecessary.

In the figure, reference numeral 10 denotes a pressure gauge attached to the gas supply main pipe 5. The pressure gauge 10 detects the pressure in the gas supply main pipe 5 and sends the detected value to the control system of the gas supply device 7. Feedback is performed to control the amount of gas supplied from the gas supply device 7. During operation, the pressure in the gas supply main pipe 5 is controlled so as to maintain the pressure of the draft pressure + α at the nozzle position.

The configuration of the present invention is as described above, and its operation will now be described. The gas supply device 7 is operated while the floating structure 1 is floating on the sea surface, and compressed gas such as nitrogen is supplied to the gas supply main pipe 5 via the pipe 8. Since the pressure in the gas supply main pipe 5 is equal to the draft pressure + α, the supplied gas is ejected from the nozzle 9 into the sea through the branch pipe 7.

The gas ejected into the sea becomes bubbles,
It moves along the slope of the bottom surface 2, further rises along the side surface 3, and is discharged from the sea surface. At this time, since the inclined bottom surface 2 and the side surface 3 are partitioned by the partition plate 4,
Bubbles rise in each zone, and are not flown in the length direction of the floating structure 1 due to the influence of tides and waves.

The pressure in the gas supply main pipe 5 is detected by a pressure gauge 10 and the detected value is sent to a gas supply device 7.
Is fed back to the control system, and the gas supply amount is controlled so as to keep the pressure of the draft pressure + α, so that the gas is always jetted from the nozzle 9. That is,
Since the inclined bottom surface 2 and the side surface 3 of the floating structure 1 are always covered with bubbles, a gas layer is formed by the bubbles on the entire outer surface of the floating structure 1 under the draft.

In general, the time when marine organisms settle on the floating structure is limited, so that the gas layer formation according to the present invention may be performed only at a time that matches the time when marine organisms settle. it can.

In addition, even if the operation is suspended due to the above or other conditions, the pressure in the gas supply main pipe 5 becomes lower than the draft pressure because the nozzle 9 with the check valve is used in the present invention. Even if it does, seawater does not flow into the gas supply main pipe 5.

Also in the embodiment shown in FIG. 4, gas is supplied from the gas supply device 7 to the gas supply main pipe 5, and is ejected from the nozzle 9, and similarly, a gas layer is formed by bubbles. Although not shown, a nozzle is also attached to the bottom of the gas supply main pipe 5 in FIG. 4 so that gas is also ejected from the bottom,
If the gas supply main pipe 5 is also covered with air bubbles, it is possible to prevent marine organisms from growing on the gas supply main pipe 5.

[0023]

According to the present invention, an inclined surface is formed on the bottom surface of the floating structure, with the central portion in the width direction as the top portion, and inclined on both sides.
A partition plate is attached along the side surface from the inclined surface, the side surface is divided into a number of zones from the inclined bottom surface in the longitudinal direction of the floating structure, and a gas such as nitrogen is jetted from the top of the inclined surface to each zone, Was raised along the side surface from the inclined bottom surface of each zone surrounded by the partition plate as air bubbles, so that a gas layer of air bubbles was formed from the bottom surface to the side surfaces of the floating structure.

As a result, a gas layer is formed by air bubbles on the entire surface of the floating structure under the draft, thereby destroying the epiphytic environment of the marine life. Can now be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a floating structure according to the present invention.

FIG. 2 is a side view showing a part of the cross section.

FIG. 3 is a diagram showing a mounted state of a nozzle.

FIG. 4 is a schematic front view of a floating structure showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floating structure 2 Bottom surface 3 Side surface 4 Partition plate 5 Gas supply main pipe 6 Branch pipe 7 Gas supply device 8 Piping 9 Nozzle 10 Pressure gauge

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[Procedure amendment]

[Submission date] January 31, 2000 (200.1.3
1)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (3)

[Claims] An inclined bottom surface is formed on the bottom surface of the floating structure, having a central portion in the width direction as a top portion, and an inclined bottom surface inclined on both sides, and a partition plate is attached along the side surface from the inclined bottom surface, and the length of the floating structure is The side surface is divided into a number of zones from the inclined bottom surface in the direction, and gas such as nitrogen is jetted out from the top of the inclined bottom surface in each zone, and the gas is raised as bubbles along the side surfaces from the inclined bottom surface of each zone. An ocean floating structure, wherein a gas layer is formed by air bubbles from a bottom surface to a side surface. 2. A gas supply device is provided on a floating structure, a gas supply main pipe is provided inside the inclined bottom surface and connected to the gas supply device, and a number of branch pipes connected to the gas supply main pipe. At the top of the inclined bottom surface, a nozzle with a check valve is attached by penetrating the inclined bottom surface in a row in the length direction of the floating structure, and the branch pipe is connected to the nozzle with the check valve. 2. The marine floating structure according to claim 1, wherein the gas supplied from the gas supply device is ejected from a nozzle through a gas supply main pipe and a branch pipe. 3. A gas supply device is provided on the floating structure, and a gas supply main pipe having nozzles with check valves mounted in a row in the longitudinal direction is provided outside the inclined bottom surface, and the gas supply main pipe is inclined. Connected to the gas supply device by piping provided through the bottom,
The marine floating structure according to claim 1, wherein the gas sent from the gas feeding device is ejected from a nozzle through a gas supply main pipe.