WO2021166776A1 - Floating body device, and cable laying structure - Google Patents

Abstract

This floating body device is provided with a support unit for supporting a cable underwater, a buoyancy body for imparting prescribed buoyancy to the support unit, and a linking portion for linking the support unit and the buoyancy body, wherein the support unit is configured with an elongated shape in such a way as to support the cable in the axial direction of the cable.

Description

Floating device and cable laying structure

The present disclosure relates to a floating device and a cable laying structure.
This application claims priority based on the Japanese application "Japanese Patent Application No. 2020-26200" filed on February 19, 2020, and incorporates all the contents described in the Japanese application.

The power transmission cable may be laid in a state of being bent in an S shape in the vertical direction due to a predetermined buoyancy in water (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-158160

According to one aspect of the present disclosure
A support that supports the cable in the water and
A buoyant body that gives a predetermined buoyancy to the support portion,
A connecting portion that connects the support portion and the buoyant body,
With
A floating device is provided in which the support portion is elongated so as to support the cable along the axial direction of the cable.

According to another aspect of the present disclosure.
Cables connected to floating water turbines and
A floating device that supports the cable by buoyancy in water,
With
The floating device is
A support portion that supports the cable and
A buoyant body that gives a predetermined buoyancy to the support portion,
A connecting portion that connects the support portion and the buoyant body,
With
The support portion is provided with a cable laying structure that is elongated so as to support the cable along the axial direction of the cable.

FIG. 1 is a schematic view showing a cable laying structure according to an embodiment of the present disclosure. FIG. 2 is a schematic perspective view showing a floating body device according to an embodiment of the present disclosure. FIG. 3 is a schematic front view showing a floating body device according to an embodiment of the present disclosure. FIG. 4 is a schematic right side view showing a floating body device according to an embodiment of the present disclosure. FIG. 5 is a schematic plan view showing a floating device according to an embodiment of the present disclosure. FIG. 6A is a schematic plan view showing the floating device of the modified example 1-1. FIG. 6B is a schematic front view showing the floating body device of the modified example 1-1. FIG. 7A is a schematic plan view showing the floating device of the modified example 1-2. FIG. 7B is a schematic front view showing the floating device of the modified example 1-2. FIG. 8A is a schematic plan view showing the floating device of the modified example 1-3. FIG. 8B is a schematic front view showing the floating device of the modified example 1-3. FIG. 9A is a schematic plan view showing the floating device of the modified example 1-4. FIG. 9B is a schematic front view showing the floating device of the modified example 1-4. FIG. 10A is a schematic plan view showing the floating device of the modified example 2-1. FIG. 10B is a schematic front view showing the floating body device of the modified example 2-1. FIG. 10C is a schematic front view showing the relationship between the buoyancy center and the center of gravity in the buoyancy device of the modified example 2-1. FIG. 11A is a schematic plan view showing the floating device of the modified example 2-2. FIG. 11B is a schematic front view showing the floating body device of the modified example 2-2. FIG. 12 is a schematic plan view showing the floating device of the modified example 3. FIG. 13 is a schematic view showing the cable laying structure of the modified example 4.

[Issues to be solved by this disclosure]
An object of the present disclosure is to provide a technique capable of stably supporting a cable underwater.

[Effect of the present disclosure]
According to the present disclosure, the cable can be stably supported underwater.

[Explanation of Embodiments of the present disclosure]
<Knowledge obtained by the inventor>
First, the knowledge obtained by the inventor will be described.

(I) New Issues Related to Distributed Buoys As described above, a predetermined buoyant body may be attached to the cable in order to obtain a predetermined alignment of the cable in water. In this case, the weight of the cable and the buoyant body may increase over time due to the adhesion of maling loin such as barnacles to the cable and the buoyant body. Therefore, it is desirable that the buoyancy of the buoyant body be increased from the time of laying so as to offset the increase in gravity when maling loin adheres over time.

However, when a plurality of distributed buoys are used and they are directly attached to the cable as in the conventional case, if the buoyancy of each of the plurality of distributed buoys is increased, local buoyancy is concentrated on the cable. There was a possibility that it would end up. Concentration of buoyancy could cause the cable to bend excessively and damage the cable.

(Ii) New Issues Related to Rotation of Floating Device In consideration of the above-mentioned (i), the present inventors have studied a floating device having a configuration in which a plurality of distributed buoys are not directly attached to the cable.

Here, in the buoyancy device, consider the case where the buoyancy center of the buoyancy body is located vertically below the center of gravity of the cable (that is, the case where buoyancy is applied from the bottom side of the cable). In this case, when a tidal current occurs in the direction intersecting the cable in a plan view, the center of gravity of the cable shifts from the position on the buoyant center of the buoyant body in the tidal current direction. When the center of gravity of the cable shifts in this way, the cable replaces the buoyant body and tries to move vertically downward, and the buoyant body replaces the cable and tries to move vertically upward. Therefore, the floating device may rotate about an axis along the longitudinal direction of the support portion. If the floating device rotates, the cable may come off from the support.

From these results, the present inventors have found that the positional relationship between the buoyancy center of the buoyant body and the center of gravity of the cable in the buoyancy device is involved in the stable support of the cable.

The present disclosure described below is based on the new issues of (i) and (ii) described above.

<Embodiment of the present disclosure>
Embodiments of the present disclosure will be listed and described.

[1] The floating device according to one aspect of the present disclosure is
A support that supports the cable in the water and
A buoyant body that gives a predetermined buoyancy to the support portion,
A connecting portion that connects the support portion and the buoyant body,
With
The support portion is configured to be elongated so as to support the cable along the axial direction of the cable.
According to this configuration, the cable can be stably supported underwater.

[2] In the floating device according to the above [1],
The connecting portion is a support portion such that the buoyancy center of the buoyant body is located vertically above the center of gravity of the cable in a cross section perpendicular to the cable including the buoyancy center when there is no tidal current in water. And the buoyant body is connected.
According to this configuration, the rotation of the floating body device can be suppressed.

[3] In the floating device according to the above [1] or [2],
The support portion has a vertically convex partial arc, and supports the cable so that the axis of the cable follows the partial arc.
According to this configuration, the cable can be curved in an arc shape following the partial arc of the support portion.

[4] In the floating device according to any one of the above [1] to [3].
A plurality of the buoyant bodies are provided,
A pair of buoyant bodies among the plurality of buoyant bodies are provided on both sides of the support portion in a plan view.
According to this configuration, the rotation of the floating body device can be suppressed.

[5] In the floating device according to any one of the above [1] to [3].
A plurality of the support portions are provided so as to support each of the plurality of cables.
A pair of support portions among the plurality of support portions are provided on both sides of the buoyant body in a plan view.
According to this configuration, the rotation of the floating body device can be suppressed.

[6] In the floating device according to any one of the above [1] to [5].
The support portion is configured to be moored to the bottom of the water via a mooring line.
According to this configuration, the floating device can be held together by the tension of the mooring line.

[7] In the floating device according to the above [6],
The support portion
The connection point to which the connection portion is connected and
The mooring point to which the mooring line is connected and
Have,
The mooring point is provided directly below the connecting point.
According to this configuration, twisting of the support portion can be suppressed.

[8] In the floating device according to the above [6],
The support portion
The connection point to which the connection portion is connected and
A pair of mooring points to which the mooring lines are connected,
Have,
Each of the pair of mooring points is provided at a position closer to the end portion in the longitudinal direction of the support portion than the connection point.
According to this configuration, the rotation of the floating body device can be suppressed.

[9] In the floating device according to any one of the above [1] to [8].
A pair of the connecting portions are provided at positions separated from the center of the supporting portion in the longitudinal direction.
According to this configuration, the rotation of the floating body device can be suppressed.

[10] In the floating device according to any one of the above [1] to [8].
The connecting portion is provided at the center of the supporting portion in the longitudinal direction.
According to this configuration, the rotation of the floating body device can be suppressed.

[11] In the floating device according to any one of the above [1] to [10].
The buoyant body is configured to be symmetrical with respect to the central axis when viewed from the longitudinal direction of the support portion.
According to this configuration, the rotation of the floating body device can be suppressed.

[12] In the floating device according to any one of the above [1] to [11].
The upper corners at both ends of the support in the longitudinal direction are curved in an arc shape.
According to this configuration, damage to the cable can be suppressed.

[13] In the floating device according to the above [12],
The radius of curvature at each of the longitudinal ends of the support is smaller than the radius of curvature at the center of the support in the longitudinal direction.
According to this configuration, damage to the cable can be suppressed.

[14] The cable laying structure according to another aspect of the present disclosure is
Cables connected to floating water turbines and
A floating device that supports the cable by buoyancy in water,
With
The floating device is
A support portion that supports the cable and
A buoyant body that gives a predetermined buoyancy to the support portion,
A connecting portion that connects the support portion and the buoyant body,
With
The support portion is configured to be elongated so as to support the cable along the axial direction of the cable.
According to this configuration, the cable can be stably supported underwater.

[Details of Embodiments of the present disclosure]
Next, one embodiment of the present disclosure will be described below with reference to the drawings. It should be noted that the present disclosure is not limited to these examples, but is indicated by the scope of claims and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

<One Embodiment of the present disclosure>
(1) Outline of cable laying structure The outline of the cable laying structure according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 1 is a schematic view showing a cable laying structure according to the present embodiment.

As shown in FIG. 1, the cable laying structure 10 of the present embodiment includes, for example, a water supply facility 90, a cable 100, a floating device 20, and a mooring line 800.

The floating type water surface equipment 90 is installed, for example, in a state of floating on the water due to buoyancy. The water equipment 90 can move within a predetermined range while floating on the water while being moored by a mooring line (not shown). Specifically, the water supply facility 90 is, for example, a wind power generation facility. The floating type includes, for example, a semi-sub type, a spar (SPAR) type, and a TLP (tension leg platform) type, but the floating type is not particularly limited.

The cable 100 is configured as, for example, a power cable that transmits the electric power generated by the water supply equipment 90 to a substation equipment or the like. The cable 100 is laid so as to rise vertically upward from the bottom of the water toward the water equipment 90, for example.

The cable 100 is configured as, for example, a so-called CV cable (also referred to as a cross-linked polyethylene insulated vinyl sheath cable, a Cross-Linked Polyethylene insulated Vinyl chloride shear cable, or an XLPE cable). Specifically, the cable 100 includes, for example, a conductor (not shown), an inner semiconductive layer (not shown), an insulating layer (not shown), and an outer semiconductive layer (not shown) from the center side to the outer peripheral side. (Not shown), shielding layer (not shown), sheath (not shown), intervening (not shown), holding tape (not shown), seating tape (not shown), iron wire exterior (armor) It has an anticorrosion layer (coating layer) (not shown) and an anticorrosion layer (not shown). Note that tape or the like may be applied to the inside or outside of the shielding layer. Further, the case is not limited to the case where there is only one cable core having a conductor to the sheath, and a plurality of cable cores may be provided.

The floating device 20 is configured to support the cable 100 by buoyancy in water, for example. Thereby, for example, the cable 100 can be laid in a state of being bent in an S shape in the vertical direction. For example, when the water supply equipment 90 moves, the movement amount of the water supply equipment 90 can be absorbed by changing the alignment of the cable 100 bent in an S shape.

The mooring line 800 is configured to moor the floating device 20 to the bottom of the water, for example. The mooring line 800 is, for example, a rope, a wire, a chain, or the like.

(2) Floating device The floating device 20 of the present embodiment will be described with reference to FIGS. 2 to 5. 2 to 5 are a schematic perspective view, a schematic front view, a schematic right side view, and a schematic plan view showing the floating body device according to the present embodiment, respectively. In the following, "planar view" can be rephrased as when the floating device 20 is viewed in the direction of gravity or when the support portion 200 is viewed from above the mounting surface 210.

As shown in FIGS. 2 to 5, the floating body device 20 of the present embodiment includes, for example, a support portion 200, a buoyant body 300, and a connecting portion 400.

(Support part)
As shown in FIGS. 2 to 5, the support portion 200 is configured to support the cable 100 in water, for example.

The support portion 200 is made of, for example, a material having rigidity capable of supporting the cable 100. The material constituting the support portion 200 includes, but is not limited to, iron, steel, or a metal having corrosion resistance.

In the present embodiment, the support portion 200 is configured to be elongated so as to support the cable 100 along the axial direction, for example. As a result, the cable 100 can be stably supported over a predetermined length.

The length of the support portion 200 in the longitudinal direction is, for example, longer than the length of the buoyancy body 300 described later. Specifically, the length of the support portion 200 in the longitudinal direction depends on the size of the buoyant body 300, but is, for example, 1.2 times or more, preferably 1.5 times or more the length of the buoyant body 300. be. Alternatively, the length of the support portion 200 in the longitudinal direction is, for example, about 1 m longer than the length of the buoyant body 300. As a result, even if the number of buoyant bodies 300 is small, the alignment of the cable 100 can be maintained according to the shape of the support portion 200 in the longitudinal direction.

In the present embodiment, the support portion 200 has, for example, a vertically convex partial arc, and is configured to support the cable 100 so that the axis of the cable 100 follows the partial arc. The "partial arc" here means at least a part of the arc, and is not necessarily limited to a perfect circular arc, but may be an elliptical arc. With such a shape, the cable 100 can be curved in an arc shape following the partial arc of the support portion 200. As a result, the alignment of the cable 100 can be formed into a neat S-shape.

_{The radius of curvature (RC} ) at the center of the support portion 200 in the longitudinal direction is not particularly limited. However, it is necessary to relax the lateral pressure applied to the cable 100, and the maximum allowable lateral pressure is, for example, 4 t / m. Since tension is applied by about a dozen tons, the radius of curvature at the center of the support portion 200 in the longitudinal direction is preferably 2.5 m or more, for example. On the other hand, the radius of curvature at the center of the support portion 200 in the longitudinal direction is preferably, for example, 10 m. As a result, excessive bending of the support portion 200 at the end portion in the longitudinal direction can be suppressed. In the case where the radius of curvature in the longitudinal direction of the center of the support portion 200 is increased, as described below, the radius of curvature R _E in the respective longitudinal ends of the support portion 200, the longitudinal center of the supporting portion 200 It is preferable that it is smaller than the radius of curvature _{RC in.}

Further, in the present embodiment, the support portion 200 has, for example, a mounting surface 210 on which the cable 100 is mounted. The cross-sectional shape of the mounting surface 210 orthogonal to the longitudinal direction of the support portion 200 is, for example, a partial arc shape that follows the outer shape of the cable 100. As a result, the outer peripheral surface of the cable 100 can be brought into contact with the entire mounting surface 210. As a result, it is possible to prevent the cable 100 from coming off from the mounting surface 210.

As shown in FIG. 4, in the present embodiment, the support portion 200 is configured to be moored to the bottom of the water via a mooring line 800, for example. As a result, the floating device 20 can be held together by the tension of the mooring line 800.

Here, the support portion 200 has, for example, a connection point CP to which the connection portion 400 described later is connected and a mooring point MP to which the mooring line 800 is connected. In the present embodiment, the mooring point MP is provided, for example, directly below the connection point CP.

As shown in FIG. 4, in the present embodiment, the upper corners at both ends of the support portion 200 in the longitudinal direction are curved in an arc shape (smaller than the arc formed by the entire support portion 200), for example. .. That is, the radius of curvature R _E in the respective longitudinal ends of the support portion 200 is, for example, smaller than the radius of curvature R _C in the longitudinal direction of the center of the support portion 200. As a result, both ends of the support portion 200 in the longitudinal direction and the cable 100 can be brought into smooth contact with each other. It is possible to suppress the concentration of stress on the cable 100 due to the contact between both ends of the support portion 200 in the longitudinal direction and the cable 100. As a result, damage to the cable 100 can be suppressed.

As shown in FIG. 5, in the present embodiment, the width of the support portion 200 in the lateral direction in a plan view is constant over the entire longitudinal direction of the support portion 200, for example. As a result, even if the cable 100 swings due to the tidal current in the direction intersecting the cable 100 in a plan view, it is possible to prevent the cable 100 from coming off from the mounting surface 210.

(Buoyancy body)
As shown in FIGS. 2 to 5, the buoyancy body 300 is configured to give a predetermined buoyancy to, for example, the support portion 200. As a result, the cable 100 can be levitated via the support portion 200 by the buoyancy of the buoyancy body 300.

The material constituting the buoyancy body 300 is not limited, and examples thereof include a resin material such as polyethylene.

The buoyancy of the buoyancy body 300 is larger than, for example, the buoyancy of a dispersed buoy as a conventional buoyancy body. The "dispersion buoy" referred to here is attached so as to surround the outer circumference of the cable 100, and a plurality of "distributed buoys" are provided along the axial direction of the cable 100. The buoyancy per dispersed buoy is, for example, several tens of kg to several hundreds of kg. On the other hand, the buoyancy per buoyancy body 300 of the present embodiment is, for example, 1 ton or more, preferably 5 tons or more and 20 tons or less.

In this embodiment, for example, a plurality of buoyant bodies 300 are provided. A pair of buoyant bodies 300 out of the plurality of buoyant bodies 300 are provided on both sides of the support portion 200 in a plan view, for example. One of the pair of buoyant bodies 300 is a buoyant body 300a, and the other is a buoyant body 300b.

In the present embodiment, the pair of buoyant bodies 300 are provided so that the magnitudes of the moments are equal, for example, with the support portion 200 interposed therebetween. Specifically, the pair of buoyant bodies 300 have buoyancy equal to each other, and are provided at positions equidistant from the support portion 200 with the support portion 200 interposed therebetween in a plan view.

In the present embodiment, the buoyancy body 300 is configured symmetrically with respect to the central axis when viewed from the longitudinal direction of the support portion 200, for example. Specifically, the buoyancy body 300 is formed, for example, into a prismatic shape, a columnar shape, a spherical shape, or the like having even-numbered corners.

Further, the central axis of the buoyancy body 300 is arranged along the longitudinal direction of the support portion 200, for example. Thereby, the balance of the buoyancy of the buoyancy body 300 applied to the support portion 200 can be improved.

(Connecting part)
As shown in FIGS. 2 to 5, the connecting portion 400 connects, for example, the support portion 200 and the buoyant body 300.

The connecting portion 400 is made of, for example, a material having rigidity capable of maintaining the connection between the supporting portion 200 and the buoyant body 300. The material constituting the connecting portion 400 is not limited, and examples thereof include iron, steel, and a metal having corrosion resistance.

As shown in FIGS. 3 and 4, in the present embodiment, in the connection portion 400, for example, when there is no tidal current in water, the buoyancy body 300 has a buoyancy center of the cable 100 (in the axial direction) including the buoyancy center. The support portion 200 and the buoyant body 300 are connected so as to be located vertically above the center of gravity of the cable 100 in a cross section perpendicular to the cable 100. The term "buoyancy" here means the center of buoyancy. When there are a plurality of buoyancy bodies 300, the "buoyancy" means an action point of a resultant force (also referred to as a synthetic buoyancy force) in which the buoyancy of the plurality of buoyancy bodies 300 is combined. Further, the "center of gravity of the cable 100" means the center of gravity of the cable 100 (that is, the center of the cross section) at a predetermined position in the axial direction of the cable 100. When there are a plurality of cables 100, the "center of gravity of the cables 100" means the point of action of the resultant force (also referred to as synthetic gravity) in which the gravitational forces of the plurality of cables 100 are combined.

Specifically, in the present embodiment, the buoyancy F _BA of the buoyancy _{body 300a is defined as "P BA} ", the buoyancy F _BB of the buoyancy body 300b is defined as "P _BB ", and the buoyancy F _BA and buoyancy F the center of buoyancy of synthetic buoyancy _{F BC} of the _BB is referred to as _{"P BC".} Meanwhile, the center of gravity of gravity F _CG cable in the longitudinal direction of the center and overlapping position of the support portion 200 and "P _CG". At this time, center of buoyancy _{P BC} of synthetic buoyant _{F BC,} for example, are positioned vertically above the center of gravity _{P CG} of gravity _{F CG} cable.

With such a configuration, the rotation of the floating body device 20 can be suppressed.

In the present embodiment, the connecting portion 400 is formed in a V shape, for example, and has a valley portion (not shown) and both ends (not shown). For example, the valley portion of the connecting portion 400 is connected to the support portion 200, and both ends of the connecting portion 400 are connected to the pair of buoyancy bodies 300, respectively. By forming the connecting portion 400 into a V shape in this way, the vertically upper side of the supporting portion 200 between the pair of buoyant bodies 300 can be opened. As a result, after the floating device 20 is placed on the water, the cable 100 can be placed along the axial direction from above the support portion 200 of the floating device 20.

In the present embodiment, for example, a pair of connecting portions 400 are provided at positions separated from the center of the support portion 200 in the longitudinal direction. The pair of connecting portions 400 are connected to both ends of the buoyant body 300a and the buoyant body 300b, for example.

(Specific dimensions)
The specific dimensions are not limited, but are as follows, for example.
Length of support part 200: 2.5 m or more and 10 m or less Width of support part 200: Cable outer diameter + 10 mm or more + 30 mm or less Length of buoyant body 300: 0.5 m or more and 3 m or less Diameter of buoyant body 300: 0.5 m or more 2m or less Length of connecting part 400: 0.5m or more and 2m or less Diameter of connecting part 400: 0.3m or more and 0.5m or less

(3) Cable laying method Next, the cable laying method according to the present embodiment will be described. The cable laying method of the present embodiment may be considered as a method of manufacturing a cable laying structure. Hereinafter, the step is abbreviated as "S".

(S10: Preparation process)
First, for example, in a manufacturing factory on land, a cable 100 is manufactured using a predetermined manufacturing apparatus. After producing the cable 100, each of the cables 100 is wound around a predetermined cable coil, and the cable coil is mounted on a laying ship.

The cable 100 is scaled, and the mounting position of the floating device 20 with respect to the cable 100 is marked in advance.

(S20: Submarine cable laying process (submarine cable laying process))
When the preparation step S10 is completed, the cable 100 is sent out from the laying ship into the water, and a part of the cable 100 is laid (sunk) on the bottom of the water.

(S30: Cable linear forming step)
When the submarine cable laying step S20 is completed, a predetermined alignment of the cable 100 is formed in water.

Specifically, first, the floating device 20 is dropped from the laying ship to the target point, and the floating device 20 is floated on the water. When the floating device 20 is floated, the cable 100 is unwound from the laying ship, and the cable 100 is arranged along the axial direction on the mounting surface 210 of the support portion 200 of the floating device 20. After arranging the cable 100, the diver goes underwater and attaches a weight (not shown) to the floating device 20 via the mooring line 800. After attaching the weight to the floating device 20, the floating device 20 is submerged and the floating device 20 is moored to the bottom of the water via the mooring line 800. As a result, a predetermined alignment of the cable 100 is formed in water.

With the above, the cable laying process is completed.

(4) Effects of the present embodiment According to the present embodiment, one or more of the following effects are exhibited.

(A) In the present embodiment, the support portion 200 is configured to be long so as to support the cable 100 along the axial direction. As a result, even if the number of buoyant bodies 300 is small, the support portion 200 can stably support the cable 100 over a predetermined length while maintaining the alignment of the cable 100.

(B) By supporting the cable 100 by the elongated support portion 200, the buoyancy of the buoyancy body 300 can be easily increased.

That is, in the present embodiment, by supporting the cable 100 by the elongated support portion 200, it is possible to suppress the local concentration of buoyancy on the cable 100. That is, buoyancy can be evenly applied to the cable 100 over the entire longitudinal direction of the support portion 200. Thereby, the buoyancy of the buoyancy body 300 can be easily increased. By increasing the buoyancy of the buoyancy body 300, even if the maling loin adheres to the buoyancy device 20 and the cable 100 and the weight of the buoyancy device 20 and the cable 100 increases over time, the buoyancy of the buoyancy body 300 causes the cable 100 to move. It is possible to maintain a stable alignment.

(C) By supporting the cable 100 by the elongated support portion 200, the alignment of the cable 100 can be arbitrarily and easily controlled by the shape of the support portion 200 in the longitudinal direction. Specifically, for example, the radius of curvature of the cable 100 can be controlled according to the radius of curvature of the support portion 200. In other words, it is possible to regulate that the radius of curvature of the cable 100 is excessively smaller than the radius of curvature of the partial arc of the support portion 200.

(D) By supporting the cable 100 by the long support portion 200, a large number of buoyant bodies such as a distributed buoy can be eliminated. As a result, it is possible to reduce the member cost related to the buoyancy body 300 and the work cost for attaching each buoyancy body 300.

(E) In the present embodiment, in the connecting portion 400, when there is no tidal current in water, the buoyancy body 300 has a buoyancy center vertically above the center of gravity of the cable 100 in a cross section perpendicular to the cable 100 including the buoyancy center. The support portion 200 and the buoyant body 300 are connected so as to be located. As a result, the rotation of the floating body device 20 can be suppressed.

That is, in the present embodiment, the buoyancy center of the buoyancy body 300 is located vertically above the center of gravity of the cable 100. When a tidal current occurs in the direction intersecting the cable 100 in a plan view, the buoyancy center of the buoyant body 300 shifts from the position on the center of gravity of the cable 100 in the tidal current direction. Even if the buoyancy body 300 is displaced in this way, in the present embodiment, the cable 100 tries to move vertically downward so as to be away from the buoyancy center, and the buoyancy body 300 tends to move vertically upward so as to be away from the center of gravity of the cable 100. Try to move to. That is, it is possible to generate a force that causes the buoyancy body 300 to return to the state where it is located on the center of gravity of the cable 100. As a result, the rotation of the floating body device 20 about the axis along the longitudinal direction of the support portion 200 can be suppressed. As a result, it is possible to prevent the cable 100 from coming off from the support portion 200.

(F) In the present embodiment, at least a pair of buoyant bodies 300 are provided. The pair of buoyant bodies 300 are provided on both sides of the support portion 200 in a plan view. As a result, buoyancy can be given to the support portion 200 in a well-balanced manner. As a result, the rotation of the floating body device 20 can be suppressed, and the posture of the floating body device 20 can be stably maintained.

Further, since the pair of buoyant bodies 300 are provided on both sides of the support portion 200 in a plan view, after the buoyant device 20 is placed on the water, the cable 100 is placed on the support portion 200 of the buoyant device 20. It can be arranged along the axial direction. That is, the cable 100 can be easily arranged on the floating device 20.

(G) In the present embodiment, the support portion 200 is configured to be moored to the bottom of the water via a mooring line 800. As a result, the floating device 20 can be held together by the tension of the mooring line 800. As a result, the desired alignment of the cable 100 can be maintained by the balance between the buoyancy of the buoyancy body 300, the gravity applied to the buoyancy device 20 and the cable 100, and the tension of the mooring line 800.

(H) In the support portion 200, the mooring point MP to which the mooring line 800 is connected is provided directly below the connecting point CP. That is, by bringing the mooring point MP closer to the connecting point CP, the connecting portion 400 and the mooring line 800 can be firmly connected (connected) to the support portion 200. Thereby, the rigidity of the floating body device 20 can be improved.

Also, the moment can be reduced by bringing the mooring point MP closer to the connection point CP. Thereby, the twist of the support portion 200 can be suppressed.

(I) A pair of connecting portions 400 are provided at positions separated from the center of the supporting portion 200 with the center in the longitudinal direction interposed therebetween. The support portion 200 can be stably supported by the pair of connecting portions 400. As a result, the buoyancy of the buoyancy body 300 can be given to the support portion 200 in a well-balanced manner. As a result, the rotation of the floating body device 20 can be suppressed.

(J) The buoyancy body 300 is configured to be symmetrical with respect to the central axis when viewed from the longitudinal direction of the support portion 200. Regardless of the direction in which the tidal current hits the floating body device 20, the force of the tidal current can be applied to the buoyant body 300 in a well-balanced manner. Further, regardless of the direction in which the tidal current hits the floating body device 20, the tidal current can be released from the buoyant body 300 without any load. As a result, the rotation of the floating body device 20 can be suppressed.

(5) Modified Example of One Embodiment of the Present Disclosure The above-described embodiment can be modified as shown in the following modified example, if necessary. Hereinafter, only the elements different from the above-described embodiment will be described, and the elements substantially the same as the elements described in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

<Modification example 1>
In the floating body device 20 of the first modification, the arrangement of the support portion 200 and the buoyant body 300 is different from that of the above-described embodiment.

[Modification 1-1]
6A and 6B are a schematic plan view and a schematic front view showing the floating body device of the modified example 1-1, respectively.
As shown in FIGS. 6A and 6B, a pair of support portions 200 are provided in parallel so as to support a pair of cables 100, for example. The pair of buoyant bodies 300 are provided on both sides of the pair of support portions 200 in a plan view, for example.

In the connecting portion 400, for example, when there is no tidal current in water, the buoyancy of the combined buoyancy of the pair of buoyant bodies 300 is more than the center of gravity of the combined gravity of the pair of cables 100 in a cross section perpendicular to the cable 100 including the buoyancy. The pair of support portions 200 and the pair of buoyant bodies 300 are connected so as to be located vertically above. A part of the connecting portion 400 extends in a direction intersecting the longitudinal direction of the supporting portion 200a and the supporting portion 200b, and connects the supporting portion 200a and the supporting portion 200b, for example.

According to the modified example 1-1, a pair of buoyant bodies 300 are provided on both sides of the pair of support portions 200. As a result, even if a pair of support portions 200 are provided, buoyancy can be given to the pair of support portions 200 in a well-balanced manner. As a result, even if there are a plurality of support portions 200, the rotation of the floating body device 20 can be suppressed and the posture of the floating body device 20 can be stably maintained.

[Modification 1-2]
As shown in FIGS. 7A and 7B, it is a schematic plan view and a schematic front view showing the floating body device of the modified example 1-2, respectively.
As shown in FIGS. 7A and 7B, three support portions 200 are provided in parallel so as to support the three cables 100, for example. The pair of buoyant bodies 300 are provided on both sides of the three support portions 200 in a plan view, for example.

In the connecting portion 400, for example, when there is no tidal current in water, the buoyancy of the combined buoyancy of the pair of buoyancy bodies 300 is more than the center of gravity of the combined gravity of the three cables 100 in the cross section perpendicular to the cable 100 including the buoyancy. Also, the three support portions 200 and the pair of buoyant bodies 300 are connected so as to be located vertically above. A part of the connecting portion 400 extends in a direction intersecting the longitudinal directions of the supporting portion 200a, the supporting portion 200b, and the supporting portion 200c, and connects the supporting portion 200a, the supporting portion 200b, and the supporting portion 200c. There is.

According to the modified example 1-2, a pair of buoyant bodies 300 are provided on both sides of three or more support portions 200. As a result, even if three or more support portions 200 are provided, buoyancy can be given to the three or more support portions 200 in a well-balanced manner.

[Modification 1-3]
8A and 8B are a schematic plan view and a schematic front view showing the floating body device of the modified example 1-3, respectively.
As shown in FIGS. 8A and 8B, a pair of support portions 200 are provided in parallel so as to support a pair of cables 100, for example.

For example, three buoyancy bodies 300 are provided.

Each of the three buoyant bodies 300 and each of the pair of support portions 200 are alternately arranged, for example, in a direction intersecting the longitudinal direction of the support portion 200 in a plan view. Specifically, of the three buoyant bodies 300, the pair of buoyant bodies 300 (300a, 300c) are provided on both sides of the pair of support portions 200 in a plan view, for example. The remaining buoyant body 300b is provided between the pair of support portions 200 in a plan view, for example.

In the connecting portion 400, for example, when there is no tidal current in water, the buoyancy of the combined buoyancy of the three buoyant bodies 300 is more than the center of gravity of the combined gravity of the pair of cables 100 in the cross section perpendicular to the cable 100 including the buoyancy. The pair of support portions 200 and the three buoyant bodies 300 are connected so as to be located vertically above. Specifically, the connecting portion 400 connects the buoyant body 300a and the buoyant body 300b in a V shape with the support portion 200a interposed therebetween, for example, when viewed from the longitudinal direction of the support portion 200a. The connecting portion 400 connects the buoyant body 300b and the buoyant body 300c in a V shape with the support portion 200b interposed therebetween, for example, when viewed from the longitudinal direction of the support portion 200b. That is, the connecting portion 400 is, for example, W-shaped when viewed from the longitudinal direction of the support portion 200a.

According to the modified example 1-3, a pair of buoyant bodies 300 out of the three buoyant bodies 300 are provided on both sides of the pair of support portions 200. As a result, even if a pair of support portions 200 are provided, buoyancy can be given to the pair of support portions 200 in a well-balanced manner as in the modified example 1-1.

Further, according to the modified example 1-3, each of the three buoyant bodies 300 and each of the pair of support portions 200 are alternately arranged in a direction intersecting the longitudinal direction of the support portion 200 in a plan view. .. As a result, a pair of buoyancy can be generated on both sides of the support portion 200. That is, buoyancy can be given to each support portion 200 in a well-balanced manner. As a result, the buoyancy balance of the floating body device 20 as a whole can be improved as compared with the modified example 1-1.

[Modification 1-4]
9A and 9B are a schematic plan view and a schematic front view showing the floating device of the modified example 1-4, respectively.
As shown in FIGS. 9A and 9B, three support portions 200 are provided in parallel so as to support the three cables 100, for example.

For example, four buoyant bodies 300 are provided.

Each of the four buoyant bodies 300 and each of the three support portions 200 are alternately arranged, for example, in a direction intersecting the longitudinal direction of the support portion 200 in a plan view. Specifically, of the four buoyant bodies 300, the pair of buoyant bodies 300 (300a, 300d) are provided on both sides of the three support portions 200 in a plan view, for example. The remaining buoyant bodies 300 (300b, 300c) are provided, for example, between each of the three support portions 200 in a plan view. That is, the buoyant body 300b is provided between the support portion 200a and the support portion 200b, and the buoyant body 300c is provided between the support portion 200b and the support portion 200c.

In the connecting portion 400, for example, when there is no tidal current in water, the buoyancy of the combined buoyancy of the four buoyant bodies 300 is more than the center of gravity of the combined gravity of the three cables 100 in the cross section perpendicular to the cable 100 including the buoyancy. Also, the three support portions 200 and the four buoyant bodies 300 are connected so as to be located vertically above. Specifically, the connecting portion 400 connects the buoyant body 300a and the buoyant body 300b in a V shape with the support portion 200a interposed therebetween, for example, when viewed from the longitudinal direction of the support portion 200a. The connecting portion 400 connects the buoyant body 300b and the buoyant body 300c in a V shape with the support portion 200b interposed therebetween, for example, when viewed from the longitudinal direction of the support portion 200b. The connecting portion 400 connects the buoyant body 300c and the buoyant body 300d in a V shape with the support portion 200c interposed therebetween, for example, when viewed from the longitudinal direction of the support portion 200c. That is, the connecting portion 400 has, for example, a shape in which three V-shapes are arranged in parallel when viewed from the longitudinal direction of the support portion 200a.

According to the modified example 1-4, a pair of buoyant bodies 300 out of three or more buoyant bodies 300 are provided on both sides of the three or more support portions 200. As a result, similarly to the modified example 1-1, even if three or more support portions 200 are provided, buoyancy can be given to the three or more support portions 200 in a well-balanced manner.

Further, according to the modified example 1-4, each of the three or more buoyant bodies 300 and each of the plurality of support portions 200 are alternately arranged in a direction intersecting the longitudinal direction of the support portion 200 in a plan view. ing. As a result, a pair of buoyancy can be generated on both sides of the support portion 200. That is, buoyancy can be given to each support portion 200 in a well-balanced manner. As a result, the buoyancy balance of the floating body device 20 as a whole can be improved as compared with the modified example 1-2.

<Modification 2>
In the floating body device 20 of the modified example 2, the arrangement of the support portion 200 and the buoyant body 300 is different from that of the above-described embodiment and the modified example 1.

[Modification 2-1]
10A and 10B are a schematic plan view and a schematic front view showing the floating body device of the modified example 2-1. FIG. 10C is a schematic front view showing the relationship between the buoyancy center and the center of gravity in the buoyancy device of the modified example 2-1.
As shown in FIGS. 10A and 10B, a plurality of support portions 200 are provided to support, for example, a plurality of cables 100, respectively. Specifically, for example, a pair of support portions 200 are provided in parallel so as to support a pair of cables 100. The pair of support portions 200 are provided on both sides of the buoyancy body 300 in a plan view, for example.

The pair of support portions 200 are provided, for example, so that the magnitudes of the moments are equal to each other with the buoyant body 300 interposed therebetween. Specifically, the pair of support portions 200 are configured so that equal gravity is applied to each other (including the cable 100), and are provided at positions equidistant from the buoyancy body 300 with the buoyancy body 300 sandwiched in a plan view. There is.

As shown in FIG. 10C, in the connecting portion 400, for example, when there is no tidal current in water, the buoyancy of the combined buoyancy of the buoyancy body 300 is a pair of cables 100 in a cross section perpendicular to the cable 100 including the buoyancy. The pair of support portions 200 and the buoyancy body 300 are connected so as to be located vertically above the center of gravity of the synthetic gravity. Specifically, the connecting portion 400 connects the supporting portion 200a and the supporting portion 200b in an inverted V shape with the buoyant body 300 interposed therebetween, for example, when viewed from the longitudinal direction of the supporting portion 200a.

In this modification, the buoyancy F _BA of the buoyancy body 300 is referred to as “P _BA ”. Meanwhile, the center of gravity of gravity _{F CGa} cable 100a in the longitudinal center and overlapping position of the support portion 200a and a _{"P CGa",} the center of gravity of gravity _{F CGb} cable 100b in the longitudinal direction of the center and overlapping position of the support portion 200b _{Let be} "PCGb". In addition, the center of gravity of the synthetic gravity _{F CGc} of gravity _{F CGa} and gravity _{F CGb} to as _{"P CGc".} At this time, the buoyancy P _{BA of the buoyancy F BA} is located vertically _above the center of gravity P _CGc of the synthetic gravity F CGC of the cable 100, for example.

With such a configuration, the rotation of the floating body device 20 can be suppressed.

The connecting portion 400 is, for example, configured in an inverted V shape and has a mountain portion (not shown) and both ends (not shown). For example, the mountain portion of the connecting portion 400 is connected to the buoyant body 300, and both ends of the connecting portion 400 are connected to a pair of supporting portions 200, respectively.

According to the modified example 2-1 a pair of support portions 200 are provided on both sides of the buoyant body 300. As a result, even if a pair of support portions 200 are provided, the gravity of the pair of support portions 200 can be applied to both sides of the buoyancy body 300 in a well-balanced manner. As a result, even if there are a plurality of support portions 200, the rotation of the floating body device 20 can be suppressed and the posture of the floating body device 20 can be stably maintained.

[Modification 2-2]
11A and 11B are a schematic plan view and a schematic front view showing the floating body device of the modified example 2-2.
As shown in FIGS. 11A and 11B, three support portions 200 are provided in parallel so as to support the three cables 100, for example.

A pair of buoyant bodies 300 are provided, for example.

Each of the three support portions 200 and each of the two buoyancy bodies 300 are alternately arranged, for example, in a direction intersecting the longitudinal direction of the support portion 200 in a plan view. Specifically, of the three support portions 200, the pair of support portions 200 (200a, 200c) are provided on both sides of the pair of buoyant bodies 300 in a plan view, for example. The remaining support portion 200b is provided between the pair of buoyant bodies 300 in a plan view, for example.

In the connecting portion 400, for example, when there is no tidal current in water, the buoyancy of the combined buoyancy of the pair of buoyancy bodies 300 is more than the center of gravity of the combined gravity of the three cables 100 in the cross section perpendicular to the cable 100 including the buoyancy. Also, the three support portions 200 and the pair of buoyant bodies 300 are connected so as to be located vertically above. Specifically, the connecting portion 400 connects the supporting portion 200a and the supporting portion 200b in an inverted V shape with the buoyant body 300a interposed therebetween, for example, when viewed from the longitudinal direction of the supporting portion 200a. The connecting portion 400 connects the supporting portion 200b and the supporting portion 200c in an inverted V shape with the buoyant body 300b interposed therebetween, for example, when viewed from the longitudinal direction of the supporting portion 200b. That is, the connecting portion 400 has an inverted W shape when viewed from the longitudinal direction of the support portion 200a, for example.

According to the modified example 2-2, a pair of support portions 200 out of three or more support portions 200 are provided on both sides of the plurality of buoyant bodies 300. As a result, even if three or more support portions 200 are provided, the gravity of the pair of support portions 200 can be applied to both sides of the plurality of buoyant bodies 300 in a well-balanced manner.

Further, according to the modified example 2-2, each of the three or more support portions 200 and each of the plurality of buoyant bodies 300 are alternately arranged in a direction intersecting the longitudinal direction of the support portion 200 in a plan view. ing. As a result, the gravity of the pair of support portions 200 can be applied in a well-balanced manner on both sides of the buoyancy bodies 300. As a result, the buoyancy balance of the floating body device 20 as a whole can be improved.

<Modification example 3>
In the floating device 20 of the third modification, the planar shape of the support portion 200 is different from that of the above-described embodiment.

FIG. 12 is a schematic plan view showing the floating device of the modified example 3.
As shown in FIG. 12, the width of the support portion 200 in the lateral direction in a plan view gradually increases from the center of the support portion 200 in the longitudinal direction toward both ends, for example.

According to the third modification, even if the cable 100 swings due to the tidal current in the direction intersecting the cable 100 in a plan view, the cable 100 has a surplus (play) of the width of both ends in the longitudinal direction of the support portion 200. Swinging can be tolerated. As a result, it is possible to prevent an excessive stress from being applied to the cable 100 at the end of the support portion 200, and to prevent the cable 100 from being excessively bent. As a result, damage to the cable 100 can be suppressed.

<Modification example 4>
In the cable laying structure 10 of the modified example 4, the configuration related to the mooring of the floating device 20 is different from that of the above-described embodiment.

FIG. 13 is a schematic view showing the cable laying structure of the modified example 4.
As shown in FIG. 13, the support portion 200 is not moored to the bottom of the water, for example.

According to the modified example 4, since the support portion 200 is not moored to the bottom of the water, the floating body device 20 can be freely moved in the horizontal direction in accordance with the horizontal movement of the water surface equipment 90.

<Other Embodiments of the present disclosure>
Although the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments, and various changes can be made without departing from the gist thereof.

In the above embodiment, the case where the water supply equipment 90 is a wind power generation equipment as an example has been described, but the water supply equipment 90 is not limited to the power generation equipment such as the wind power generation equipment, and may be, for example, a substation equipment. Further, the water equipment 90 may be installed at sea, on a river, on a lake, or the like.

In the above-described embodiment, the case where the cable 100 is configured as a CV cable has been described, but the cable 100 may include a communication cable such as an optical fiber at least in part.

In the above-described embodiment, the case where the support portion 200 is configured to be moored to the bottom of the water via the mooring rope 800 has been described, but even if the support portion 200 is not moored to the mooring rope 800, the floating body The mooring line 800 may not be provided as long as the posture of the device 20 can be stably maintained.

In the above-described embodiment, the case where one floating device 20 is provided in one cable laying structure 10 has been described, but a plurality of floating devices 20 may be provided.

In the above-described embodiment, the case where the connecting portion 400 is formed in a V shape has been described, but the connecting portion 400 may be formed in a U shape. The term "U-shaped" as used herein includes not only the case where the bent portion is composed of only curved lines but also the case where the bent portion is composed of right-angled corners, for example.

In the above-described embodiment, the case where the mooring point MP of the support portion 200 is provided directly below the connection point CP has been described, but each of the pair of mooring point MPs in the support portion 200 has a support portion rather than the connection point CP. It may be provided at a position close to the end portion in the longitudinal direction of the 200. As a result, the mooring point MP can be set vertically below the connecting point CP. As a result, the rotation of the floating body device 20 can be suppressed.

In the above-described embodiment, the case where the connecting portions 400 are provided at a position away from the center of the support portion 200 with the center in the longitudinal direction interposed therebetween is described, but the connecting portion 400 is provided in the longitudinal direction of the support portion 200. It may be provided in the center (only). As a result, even if the support portion 200 is convex vertically, the buoyancy center of the buoyant body 300 can be reliably arranged vertically above the center of gravity of the cable 100. As a result, the rotation of the floating body device 20 can be suppressed.

<Preferable aspect of the present disclosure>
Hereinafter, preferred embodiments of the present disclosure will be added.

(Appendix 1)
A support that supports the cable in the water and
A buoyant body that gives a predetermined buoyancy to the support portion,
A connecting portion that connects the support portion and the buoyant body,
With
The support portion is a floating device configured to support the cable along the axial direction of the cable.

(Appendix 2)
The connecting portion is a support portion such that the buoyancy center of the buoyant body is located vertically above the center of gravity of the cable in a cross section perpendicular to the cable including the buoyancy center when there is no tidal current in water. The buoyant device according to Appendix 1, which connects the buoyant bodies.

(Appendix 3)
The floating device according to Appendix 1 or Appendix 2, wherein the support portion has a vertically convex partial arc and supports the cable so that the axis of the cable follows the partial arc.

(Appendix 4)
A plurality of the buoyant bodies are provided,
The buoyancy device according to any one of Supplementary note 1 to Supplementary note 3, wherein the pair of buoyancy bodies among the plurality of buoyancy bodies are provided on both sides of the support portion in a plan view.

(Appendix 5)
The buoyancy device according to Appendix 4, wherein the pair of buoyant bodies are provided so as to have equal moments across the support portion.

(Appendix 6)
The buoyancy device according to Appendix 4 or 5, wherein the pair of buoyant bodies have buoyancy equal to each other and are provided at positions equidistant from the support portion with the support portion sandwiched in a plan view.

(Appendix 7)
A plurality of the support portions are provided in parallel so as to support each of the plurality of cables.
The buoyancy device according to Appendix 4 or Appendix 5, wherein the pair of buoyant bodies are provided on both sides of the plurality of support portions in a plan view.

(Appendix 8)
Three or more of the buoyant bodies are provided.
A plurality of the support portions are provided in parallel so as to support each of the plurality of cables.
The buoyancy device according to Appendix 4, wherein each of the three or more buoyant bodies and each of the plurality of support portions are alternately arranged in a direction intersecting the longitudinal direction of the support portion in a plan view.

(Appendix 9)
The connecting portion is formed in a V-shape or a U-shape, has a valley portion and both ends, and has a valley portion and both ends.
The valley portion of the connecting portion is connected to the support portion, and the valley portion is connected to the support portion.
The floating body device according to any one of Supplementary note 4 to Supplementary note 8, wherein both ends of the connecting portion are connected to the pair of buoyant bodies.

(Appendix 10)
A plurality of the support portions are provided so as to support each of the plurality of cables.
The floating body device according to any one of Supplementary note 1 to Supplementary note 3, wherein the pair of supporting portions among the plurality of supporting portions are provided on both sides of the buoyant body in a plan view.

(Appendix 11)
The floating body device according to Appendix 10, wherein the pair of supporting portions are provided so that the magnitudes of the moments are equal with respect to the buoyant body.

(Appendix 12)
The floating body device according to Appendix 10 or Appendix 11, wherein the pair of supporting portions are configured to apply equal gravity to each other and are provided at positions equidistant from the buoyant body with the buoyant body sandwiched in a plan view.

(Appendix 13)
A plurality of the buoyant bodies are provided,
The floating body device according to any one of Supplementary note 10 to Supplementary note 12, wherein the pair of supporting portions are provided on both sides of the plurality of buoyant bodies in a plan view.

(Appendix 14)
A plurality of the buoyant bodies are provided,
Three or more of the support portions are provided in parallel so as to support each of the three or more cables.
The buoyancy device according to Appendix 10, wherein each of the three or more support portions and each of the plurality of buoyancy bodies are alternately arranged in a direction intersecting the longitudinal direction of the support portion in a plan view.

(Appendix 15)
The connecting portion is formed in an inverted V shape and has a mountain portion and both end portions.
The mountain portion of the connecting portion is connected to the buoyant body and is connected to the buoyant body.
The floating device according to any one of Supplementary note 10 to Supplementary note 14, wherein both ends of the connecting portion are connected to the pair of support portions, respectively.

(Appendix 16)
The floating device according to any one of Supplementary note 1 to Supplementary note 15, wherein the support portion is configured to be moored to the bottom of the water via a mooring line.

(Appendix 17)
The support portion
The connection point to which the connection portion is connected and
The mooring point to which the mooring line is connected and
Have,
The floating device according to Appendix 16, wherein the mooring point is provided directly below the connecting point.

(Appendix 18)
The support portion
The connection point to which the connection portion is connected and
A pair of mooring points to which the mooring lines are connected,
Have,
The floating device according to Appendix 16, wherein each of the pair of mooring points is provided at a position closer to the end of the support portion in the longitudinal direction than the connection point.

(Appendix 19)
The floating device according to any one of Supplementary note 1 to Supplementary note 18, wherein the connecting portion is provided in pairs at positions separated from the center of the support portion in the longitudinal direction.

(Appendix 20)
The floating device according to any one of Supplementary note 1 to Supplementary note 19, wherein the connecting portion is provided at the center of the support portion in the longitudinal direction.

(Appendix 21)
The buoyancy body according to any one of Supplementary note 1 to Supplementary note 20, which is configured symmetrically with respect to the central axis when viewed from the longitudinal direction of the support portion.

(Appendix 22)
The floating device according to any one of Supplementary note 1 to Supplementary note 21, wherein the upper corner portions at both ends in the longitudinal direction of the support portion are curved in an arc shape.

(Appendix 23)
The floating device according to Appendix 22, wherein the radius of curvature at each of both ends of the support portion in the longitudinal direction is smaller than the radius of curvature at the center of the support portion in the longitudinal direction.

(Appendix 24)
The floating device according to any one of Supplementary note 1 to Supplementary note 23, wherein the width of the support portion in the lateral direction in a plan view is constant over the entire longitudinal direction of the support portion.

(Appendix 25)
The floating device according to any one of Supplementary note 1 to Supplementary note 24, wherein the width of the support portion in the lateral direction in a plan view gradually increases from the center of the support portion in the longitudinal direction toward both ends.

(Appendix 26)
Cables connected to floating water turbines and
A floating device that supports the cable by buoyancy in water,
With
The floating device is
A support portion that supports the cable and
A buoyant body that gives a predetermined buoyancy to the support portion,
A connecting portion that connects the support portion and the buoyant body,
With
The support portion is a cable laying structure configured to support the cable along the axial direction of the cable.

10 Cable laying structure 20 Floating device 90 Water equipment 100 Cable 200 (200a to 200c) Supporting part 210 Mounting surface 300 (300a to 300d) Buoyant body 400 Connecting part 800 Mooring line

Claims (14)

1. A support that supports the cable in the water and
   A buoyant body that gives a predetermined buoyancy to the support portion,
   A connecting portion that connects the support portion and the buoyant body,
   With
   The support portion is a floating device configured to support the cable along the axial direction of the cable.
2. The connecting portion is a support portion such that the buoyancy center of the buoyant body is located vertically above the center of gravity of the cable in a cross section perpendicular to the cable including the buoyancy center when there is no tidal current in water. The buoyant device according to claim 1, wherein the buoyant body is connected to the buoyant body.
3. The floating device according to claim 1 or 2, wherein the support portion has a vertically convex partial arc, and supports the cable so that the axis of the cable follows the partial arc.
4. A plurality of the buoyant bodies are provided,
   The buoyancy device according to any one of claims 1 to 3, wherein the pair of buoyancy bodies among the plurality of buoyancy bodies are provided on both sides of the support portion in a plan view.
5. A plurality of the support portions are provided so as to support each of the plurality of cables.
   The floating device according to any one of claims 1 to 3, wherein the pair of supporting portions among the plurality of supporting portions are provided on both sides of the buoyant body in a plan view.
6. The floating device according to any one of claims 1 to 5, wherein the support portion is configured to be moored to the bottom of the water via a mooring line.
7. The support portion
   The connection point to which the connection portion is connected and
   The mooring point to which the mooring line is connected and
   Have,
   The floating device according to claim 6, wherein the mooring point is provided directly below the connecting point.
8. The support portion
   The connection point to which the connection portion is connected and
   A pair of mooring points to which the mooring lines are connected,
   Have,
   The floating device according to claim 6, wherein each of the pair of mooring points is provided at a position closer to the end portion of the support portion in the longitudinal direction than the connection point.
9. The floating device according to any one of claims 1 to 8, wherein the connecting portion is provided in pairs at positions separated from the center of the support portion in the longitudinal direction.
10. The floating device according to any one of claims 1 to 8, wherein the connecting portion is provided at the center of the support portion in the longitudinal direction.
11. The buoyancy device according to any one of claims 1 to 10, wherein the buoyancy body is configured symmetrically with respect to the central axis when viewed from the longitudinal direction of the support portion.
12. The floating device according to any one of claims 1 to 11, wherein the upper corners at both ends of the support portion in the longitudinal direction are curved in an arc shape.
13. The floating device according to claim 12, wherein the radius of curvature at each of both ends of the support portion in the longitudinal direction is smaller than the radius of curvature at the center of the support portion in the longitudinal direction.
14. Cables connected to floating water turbines and
    A floating device that supports the cable by buoyancy in water,
    With
    The floating device is
    A support portion that supports the cable and
    A buoyant body that gives a predetermined buoyancy to the support portion,
    A connecting portion that connects the support portion and the buoyant body,
    With
    The support portion is a cable laying structure configured to support the cable along the axial direction of the cable.

Images