JP2021016303A - Dynamic cable, method for manufacturing dynamic cable and method for laying dynamic cable - Google Patents

Abstract

To provide a technology that can effectively suppress influence to a dynamic cable due to adhesion of aquatic organisms thereto.SOLUTION: A dynamic cable 10 connected to a floating type floating facility 1 underwater so as to be bendable includes: a cable wire core including a conductor and an insulation layer provided so as to surround an outer periphery of the conductor; and a protection layer 170 provided so as to surround an outer periphery of the cable wire core and inhibiting aquatic organisms from adhering thereto. The protection layer is provided selectively in an axial direction of the dynamic cable.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to dynamic cables, methods of manufacturing dynamic cables, and methods of laying dynamic cables.

Wind power generation equipment, substation equipment, and the like may be installed floating on water, for example. Such floating water turbines move vertically or horizontally due to the effects of waves and wind. Therefore, the power cable (so-called dynamic cable or riser cable) connected to the water facility is laid in a state where it can be bent in water.

Specifically, the dynamic cable is laid in a state of being bent in an S shape in the vertical direction by attaching a buoy to a predetermined intermediate portion, for example. As a result, when the water equipment moves, the amount of movement of the water equipment can be absorbed by changing the alignment of the dynamic cable bent in an S shape (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-158160

As a result of conducting a demonstration test of laying a dynamic cable, the inventors have found that aquatic organisms such as barnacles may adhere to the dynamic cable, and that the attached aquatic organism affects the linearity and flexibility of the dynamic cable. I found it. Specifically, as aquatic organisms attach to at least a portion of the dynamic cable, the dynamic cable becomes heavier. When the dynamic cable becomes heavy, it becomes impossible to maintain the alignment of the dynamic cable within the designed range. Further, when the amount of aquatic organisms attached to at least a part of the dynamic cable increases, it becomes impossible to maintain the predetermined flexibility of the dynamic cable at the portion where the aquatic organisms adhere. For these reasons, when the water equipment moves, it becomes difficult to sufficiently absorb the amount of movement of the water equipment. As a result, excessive tension may be applied to the dynamic cable, or the bending radius of the dynamic cable may be less than the allowable bending radius.

In addition, the inventors have found that, as a result of the above-mentioned laying verification test, aquatic organisms do not adhere evenly in the axial direction of the dynamic cable, but adhere unevenly depending on the habitat of the aquatic organisms. It was. If aquatic organisms adhere non-uniformly in the axial direction of the dynamic cable, the alignment of the dynamic cable described above is likely to be locally broken, and the flexibility of the dynamic cable is likely to be locally reduced. As a result, at least one of the above-mentioned application of excessive tension to the dynamic cable and reduction of the bending radius of the dynamic cable may easily occur.

An object of the present disclosure is to provide a technique capable of efficiently suppressing the influence on a dynamic cable caused by the adhesion of aquatic organisms.

According to one aspect of the present disclosure
A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
The protective layer is provided with a dynamic cable selectively provided in the axial direction of the dynamic cable.

According to other aspects of the disclosure,
A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
A plurality of the protective layers are provided in the axial direction of the dynamic cable.
As the plurality of protective layers, a dynamic cable including different types depending on the underwater position when the dynamic cable is laid in water is provided.

According to yet another aspect of the present disclosure.
A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
Provided is a method for manufacturing a dynamic cable that selectively forms the protective layer in the axial direction of the cable intermediate.

According to yet another aspect of the present disclosure.
A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
Provided is a method for manufacturing a dynamic cable in which the plurality of protective layers are formed of different types depending on the underwater position when the dynamic cable is laid in water.

According to yet another aspect of the present disclosure.
It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
Provided is a method of laying a dynamic cable that selectively forms the protective layer in the axial direction of the cable intermediate.

According to yet another aspect of the present disclosure.
It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
Provided is a method for laying a dynamic cable in which the plurality of protective layers are formed of different types depending on the position in the water when the dynamic cable is laid in water.

According to the present disclosure, it is possible to efficiently suppress the influence on the dynamic cable caused by the adhesion of aquatic organisms.

It is the schematic which shows the cable laying structure which concerns on 1st Embodiment of this disclosure. It is sectional drawing which is orthogonal to the axial direction of a part of the dynamic cable which concerns on 1st Embodiment of this disclosure. It is sectional drawing of the strip-shaped body which constitutes a protective layer. It is a side view of the dynamic cable which concerns on 1st Embodiment of this disclosure. It is a side view of the dynamic cable which concerns on 1st Embodiment of this disclosure. It is the schematic which shows the laying ship which concerns on 1st Embodiment of this disclosure. It is sectional drawing which is orthogonal to the axial direction of a part of the dynamic cable which concerns on modification 1-6 of 1st Embodiment of this disclosure. It is the schematic which shows the cable laying structure which concerns on 2nd Embodiment of this disclosure.

[Explanation of Embodiments of the present disclosure]
Embodiments of the present disclosure will be listed and described.

[1] The dynamic cable according to one aspect of the present disclosure is
A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
The protective layer is selectively provided in the axial direction of the dynamic cable.
According to this configuration, it is possible to efficiently suppress the influence on the dynamic cable caused by the adhesion of aquatic organisms.

[2] In the dynamic cable according to the above [1],
The protective layer is selectively provided only in a region where the water depth is relatively shallow when the dynamic cable is laid in water.
According to this configuration, the adhesion of aquatic organisms to the dynamic cable can be efficiently suppressed.

[3] In the dynamic cable described in [2] above,
The protective layer is selectively provided in a region where the water depth is within 70 m when the dynamic cable is laid in water.
According to this configuration, it is possible to surely obtain the effect of suppressing the adhesion of aquatic organisms to the dynamic cable by the protective layer without excess or deficiency of the protective layer.

[4] The dynamic cable according to one aspect of the present disclosure is
A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
A plurality of the protective layers are provided in the axial direction of the dynamic cable.
The plurality of protective layers include different types depending on the underwater position when the dynamic cable is laid underwater.
According to this configuration, the type of each protective layer can be selected so as to be suitable for each underwater position when the dynamic cable is laid underwater.

[5] In the dynamic cable according to the above [4],
Of the plurality of protective layers, the first protective layer arranged in a region where the water depth is relatively shallow and the second protective layer arranged in a region where the water depth is relatively deep have different hydrolysis rates or dissolutions. Has speed.
According to this configuration, the hydrolysis rate or dissolution rate of each protective layer can be selected so as to be suitable for each underwater position when the dynamic cable is laid in water.

[6] In the dynamic cable according to the above [4] or [5],
Of the plurality of protective layers, the first protective layer arranged in a region where the water depth is relatively shallow and the second protective layer arranged in a region where the water depth is relatively deep suppress the adhesion of aquatic organisms. Contains antifouling agents in different contents.
According to this configuration, the content of the antifouling agent in each protective layer can be selected so as to be suitable for each underwater position when the dynamic cable is laid in water.

[7] In the dynamic cable according to any one of the above [1] to [6].
The protective layer includes a strip wound around the outer circumference of the cable core.
According to this configuration, it is possible to simplify and shorten the manufacturing process and the laying process of the dynamic cable.

[8] In the dynamic cable according to the above [7],
The strip contains a repellent that repels the aquatic organism in the substrate itself.
According to this configuration, the paint layer can be omitted, and the layer structure of the strip-shaped body can be simplified.

[9] In the dynamic cable according to the above [7],
At least the surface of the strip has the flexibility to suppress the adhesion of the aquatic organisms.
According to this configuration, the surface of the band-shaped body can be destabilized and the adhesion of aquatic organisms can be suppressed.

[10] In the dynamic cable according to any one of the above [7] to [9],
It further has a cable core and a binder for binding the strip from the outer peripheral side of the strip.
According to this configuration, it is possible to prevent the band-shaped body from unraveling.

[11] In the dynamic cable according to the above [7],
The protective layer includes a tubular protector fitted so as to surround the outer circumference of the cable core.
According to this configuration, it is possible to easily selectively form the protective layer in the axial direction of the dynamic cable.

[12] A method for manufacturing a dynamic cable according to another aspect of the present disclosure is described.
A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
The protective layer is selectively formed in the axial direction of the cable intermediate.
According to this configuration, it is possible to efficiently suppress the influence on the dynamic cable caused by the adhesion of aquatic organisms.

[13] A method for manufacturing a dynamic cable according to another aspect of the present disclosure is described.
A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
The plurality of protective layers are formed of different types depending on the underwater position when the dynamic cable is laid in water.
According to this configuration, the type of each protective layer can be selected so as to be suitable for each underwater position when the dynamic cable is laid underwater.

[14] In the dynamic cable according to the above [12] or [13],
The step of forming the protective layer is performed on the laying ship on which the dynamic cable is laid.
According to this configuration, it is possible to simplify and shorten the manufacturing process and the laying process of the dynamic cable.

[15] The method of laying the dynamic cable according to still another aspect of the present disclosure is described.
It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
The protective layer is selectively formed in the axial direction of the cable intermediate.
According to this configuration, it is possible to efficiently suppress the influence on the dynamic cable caused by the adhesion of aquatic organisms.

[16] The method of laying the dynamic cable according to still another aspect of the present disclosure is described.
It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
The plurality of protective layers are formed of different types depending on the underwater position when the dynamic cable is laid in water.
According to this configuration, the type of each protective layer can be selected so as to be suitable for each underwater position when the dynamic cable is laid 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, and 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.

<First Embodiment of the present disclosure>
(1) Cable laying structure The cable laying structure according to the first 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 first embodiment of the present disclosure.

As shown in FIG. 1, the cable laying structure of the present embodiment includes, for example, a water surface equipment 1, a submarine cable (not shown), a dynamic cable 10, a plurality of buoys 12, and a wire 15. There is.

The floating water turbine 1 is installed, for example, in a state of floating on the water due to buoyancy. The water facility 1 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 surface equipment 1 is moored to the bottom of the water using, for example, a chain or a wire (not shown). The water equipment 1 can move within a predetermined range while floating on the water while being moored by a chain or a wire.

The submarine cable and the dynamic cable 10 are configured as, for example, power cables for transmitting the electric power generated by the water surface equipment 1 to a substation equipment or the like.

The submarine cable is laid on the bottom of the water. Since the submarine cable does not move, even if the aquatic organisms described later adhere to the submarine cable, the attached aquatic organisms hardly affect the submarine cable.

The dynamic cable 10 is laid, for example, connecting the submarine cable and the water equipment 1 so as to rise vertically upward from the seabed toward the water equipment 1.

Further, the dynamic cable 10 is laid, for example, in a state of being bent in an S shape in the vertical direction. As a result, as described above, when the water equipment 1 moves, the movement amount of the water equipment 1 can be absorbed by changing the linearity of the dynamic cable 10 bent in an S shape.

Specifically, a plurality of buoys 12 are attached to the intermediate portion between the submarine cable and the water supply equipment 1 in the dynamic cable 10. As a result, the intermediate portion of the dynamic cable 10 is held in a state of floating in water, and the dynamic cable 10 is raised from the bottom of the water by the buoyancy of the buoy 12. In the following, a portion of the dynamic cable 10 that floats in water due to the attachment of the buoy 12 is referred to as a “float portion 10a”.

In the float portion 10a of the dynamic cable 10, for example, a plurality of buoys 12 are arranged at substantially equal intervals in the axial direction of the dynamic cable 10 over a predetermined length. Further, both ends of the float portion 10a of the dynamic cable 10 are moored to the bottom of the water by wires 15. As a result, the float portion 10a of the dynamic cable 10 has an arc shape that is convex vertically upward due to the balance between the buoyancy acting on each buoy 12 in water, the gravity acting on the dynamic cable 10, and the tension acting on the wire 15. It is held.

On the other hand, the portion between the float portion 10a of the dynamic cable 10 and the water supply equipment 1 hangs down due to the weight of the dynamic cable 10, and the suspension portion 10b is formed. The “suspended portion 10b” means a catenary-like loosened portion between the float portion 10a of the dynamic cable 10 and the water supply equipment 1.

With such a configuration, the dynamic cable 10 is in a state of being bent in an S shape in the vertical direction. As a result, the dynamic cable 10 exhibits the following behavior, for example.

When the water equipment 1 moves on the water due to the influence of waves or wind, the distance from the submarine cable (the connection portion between the submarine cable and the dynamic cable 10) to the water equipment 1 is determined according to the movement direction and the amount of movement of the water equipment 1. The distance changes.

When the water equipment 1 moves away from the submarine cable, the dynamic cable 10 is pulled by the water equipment 1. When the dynamic cable 10 is pulled, the height of the float portion 10a from the water bottom becomes low, and the height of the suspension portion 10b from the water bottom becomes high. As a result, the amount of movement of the surface equipment 1 from the bottom cable in the horizontal direction can be offset by the amount of vertical descent of the float portion 10a and the amount of vertical ascent of the suspension portion 10b. As a result, the water equipment 1 can be allowed to move away from the submarine cable within a predetermined range, and excessive tension can be suppressed from being applied to the dynamic cable 10.

On the contrary, when the water equipment 1 approaches the submarine cable, the dynamic cable 10 is contracted by the water equipment 1. When the dynamic cable 10 is contracted, the height of the float portion 10a from the bottom of the water increases, and the height of the suspension portion 10b from the bottom of the water decreases. As a result, the amount of movement of the water equipment 1 from the bottom cable toward the horizontal direction can be offset by the amount of vertical rise of the float portion 10a and the amount of vertical fall of the suspension portion 10b. As a result, the surface equipment 1 can be allowed to approach the submarine cable within a predetermined range, and the dynamic cable 10 can be prevented from being excessively bent.

The alignment of the dynamic cable 10 exhibiting the above behavior is designed so that a tension exceeding the allowable tension is not applied to the dynamic cable 10 even when the water supply equipment 1 is the farthest from the submarine cable, for example. .. Further, the alignment of the dynamic cable 10 is designed so that the bending radius of the dynamic cable 10 does not become less than the allowable bending radius of the dynamic cable 10, even when the water supply equipment 1 is closest to the submarine cable side, for example. There is. Specifically, for example, the buoyancy of the buoys 12 attached to the float portion 10a, the number of buoys 12, the attachment position of the buoys 12 (the position of the float portion 10a), the spacing between the buoys 12, and the wires so as to satisfy the above design conditions. A length of 15 and the like are set.

However, if aquatic organisms such as barnacles adhere to at least a portion of the dynamic cable 10 depending on their habitat, the attached aquatic organisms can affect the linearity and flexibility of the dynamic cable 10.

Therefore, at least a part of the dynamic cable 10 of the present embodiment is configured to suppress the adhesion of aquatic organisms as follows, for example.

(2) Dynamic Cable Next, the configuration of the dynamic cable 10 of the present embodiment will be described.

As shown in FIG. 1, at least a part of the dynamic cable 10 of the present embodiment has, for example, a protective layer 170. The protective layer 170 is provided, for example, as the outermost layer of the dynamic cable 10, and is configured to suppress the adhesion of aquatic organisms.

The term "underwater organism" as used herein means an organism having the property of adhering to and inhabiting structures in water. Aquatic organisms in the ocean are also called "maling loin". Specifically, examples of aquatic organisms include animals such as oysters, mussels, and barnacles, plants such as seaweed, and various aquatic organisms such as bacteria.

In the present embodiment, the protective layer 170 is selectively provided, for example, in the axial direction of the dynamic cable 10. The term "selectively provided" as used herein means that the portion having the protective layer 170 and the portion not having the protective layer 170 are arranged at different positions in the axial direction of the dynamic cable 10. ..

Specifically, in the present embodiment, the protective layer 170 is selectively provided only in a region where the water depth is relatively shallow, for example, when the dynamic cable 10 is laid in water. In other words, the protective layer 170 is not provided in a region where the water depth is relatively deep.

Here, the region where the water depth is relatively shallow is referred to as "shallow region 91", and the region where the water depth is relatively deeper than the shallow region 91 is referred to as "deep region 92". In the shallow region 91, more aquatic organisms having the property of adhering to the structure in water inhabit than in the deep region 92, and the aquatic organisms are likely to adhere to the structure. In the shallow region 91, sunlight is applied, the seawater temperature is high, and the oxygen concentration is high, so that aquatic organisms can easily breed. Therefore, in the shallow region 91, aquatic organisms are likely to adhere to the structure. Further, the flow velocity of the water flow in the shallow region 91 is faster than the flow velocity of the water flow in the deep region 92. For this reason as well, in the shallow region 91, the probability that the aquatic organisms come into contact with the structure due to the water flow increases, so that the aquatic organisms easily adhere to the structure.

In the present embodiment, as described above, the protective layer 170 is selectively provided only in the shallow region 91 to which aquatic organisms are likely to adhere, so that the adhesion of aquatic organisms to the dynamic cable 10 is efficiently suppressed. Can be done.

In the present embodiment, for example, the protective layer 170 is located in the shallow region 91 of the dynamic cable 10 in the vicinity of the connection portion (discharge portion) of the dynamic cable 10 and the water supply equipment 1 and the float portion 10a of the dynamic cable 10. It is provided in the vicinity of and in. As a result, the linear local collapse of the dynamic cable 10 and the local flexibility of the dynamic cable 10 occur in the vicinity of the connection portion of the dynamic cable 10 and the water supply equipment 1 and in the vicinity of the float portion 10a of the dynamic cable 10. It is possible to suppress such a decrease. On the other hand, for example, the protective layer 170 is provided as a portion of the dynamic cable 10 located in the deep region 92 in the vicinity of the suspension portion 10b of the dynamic cable 10 and in the vicinity of the connection portion between the dynamic cable 10 and the submarine cable. Not done. Thereby, the member cost related to the protective layer 170 can be reduced.

Further, in the present embodiment, the protective layer 170 is provided in a region where the water depth is within 70 m when the dynamic cable 10 is laid in water, for example. Most of the aquatic organisms that have the property of adhering to underwater structures inhabit areas with a water depth of approximately 70 m or less. Therefore, in the present embodiment, since the protective layer 170 is provided in the region where the water depth is within 70 m, the protective layer 170 suppresses the adhesion of aquatic organisms to the dynamic cable 10 without excess or deficiency. The effect can be surely obtained.

When most of the dynamic cable 10 is arranged in a region within a depth of 70 m, the protective layer 170 is, for example, a shallow region 91 (for example, within 30 m) to which aquatic organisms are relatively likely to adhere within a depth of 70 m. It may be selectively provided only in.

Next, the configuration of the dynamic cable 10 in the portion where the protective layer 170 is provided will be described in detail with reference to FIGS. 2 to 4B. FIG. 2 is a cross-sectional view of a part of the dynamic cable according to the present embodiment orthogonal to the axial direction. The hatching of the portion other than the protective layer 170 is omitted. FIG. 3 is a cross-sectional view of a strip-shaped body constituting the protective layer. FIG. 4A is a side view of the dynamic cable according to the present embodiment. FIG. 4B is a side view of the dynamic cable according to the present embodiment. The dotted line in FIG. 4B shows the strip-shaped body 200 when it is vertically attached.

As shown in FIG. 2, at least a part of the dynamic cable 10 of the present embodiment has, for example, a cable core 110, an interposition 120, a holding tape 130, and a seating tape 140 from the center side to the outer peripheral side. The iron wire exterior (armor) 150, the anticorrosion layer (outer layer) 160, and the protective layer 170 are provided. The configuration of the dynamic cable 10 in the portion provided with the protective layer 170 and the configuration of the dynamic cable 10 in the portion not provided with the protective layer 170 are the same except for the protective layer 170.

The cable core 110 is configured as, for example, a CV cable (also referred to as a cross-linked polyethylene insulated vinyl sheath cable, a Cross-Linked Polyethylene insulated cable, or an XLPE cable). For example, a conductor (not shown) and an internal semi-conductive layer Code not shown), insulating layer (code not shown), external semi-conductive layer (code not shown), semi-conductive tape (code not shown), copper wire (code not shown), holding tape (code not shown) It has a sheath (not shown) and a sheath (not shown). In the present embodiment, for example, the dynamic cable 10 is for alternating current, and the three cable cores 110 are twisted together.

The interposition 120 is provided so as to fill the space in the circumscribed envelope of the three cable cores 110. The interposition 120 is composed of, for example, polypropylene yarn.

The iron wire exterior 150 has a plurality of iron wires (not shown) surrounding the outer circumference of the cable core 110. For example, a plurality of iron wires are spirally wound around the outer circumference of the seat floor tape 140. Further, the iron wire is composed of, for example, a galvanized steel wire. The outer circumference of the iron wire may be coated with tar for rust prevention.

The iron wire exterior 150 has, for example, a two-layer structure, and has a first iron wire exterior 152 and a second iron wire exterior 154.

The anticorrosion layer 160 is provided so as to surround the outer periphery of the iron wire exterior 150. The anticorrosion layer 160 has, for example, polypropylene yarn (not shown). The anticorrosion layer 160 may have a sheath (not shown) that is extruded and coated so as to cover the outer periphery of the polypropylene yarn. The sheath constituting the anticorrosion layer 160 preferably contains, for example, polyethylene.

The protective layer 170 is provided so as to surround the outer circumference of the anticorrosion layer 160 (that is, the outer circumference of the cable core 110), for example.

As shown in FIG. 3, the protective layer 170 of the present embodiment includes, for example, a strip-shaped body 200 wrapped around the outer periphery of the anticorrosion layer 160. At least the surface side of the band-shaped body 200 constituting the protective layer 170 has a property of suppressing the adhesion of aquatic organisms. Further, the strip-shaped body 200 has flexibility and elasticity that can follow the bending of the cable core 110.

Specifically, the strip-shaped body 200 of the present embodiment is made of, for example, a tape. That is, the strip-shaped body 200 has, for example, a base material 210, a paint layer 220, and an adhesive layer 230.

The base material 210 holds, for example, a paint layer 220 and an adhesive layer 230, and contains a polymer having predetermined flexibility and elasticity. Specifically, the polymers constituting the base material 210 include, for example, polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, and polyvinyl chloride. , Polyimide, rubber (natural rubber or synthetic rubber) and the like. Two or more of these may be used. Moreover, you may mix other materials based on these.

The paint layer 220 is provided, for example, on the surface side of the base material 210. The paint layer 220 contains, for example, a paint that suppresses the adhesion of aquatic organisms.

The paint constituting the paint layer 220 contains, for example, a base resin and an antifouling agent.

The base resin is configured to be hydrolyzed in water, for example. When the base resin is hydrolyzed, the antifouling agent contained in the paint is eluted into the water, and the surface of the new base resin appears. By repeating this process in sequence, the adhesion of aquatic organisms can be suppressed in the long term. A paint using such a base resin is called a "self-polishing type".

Alternatively, the base resin may be configured to dissolve in water, for example. By dissolving the base resin, the same effect as the self-polishing type can be obtained. Paints using such a base resin are called "collapse type".

Only one of the self-polishing type base resin and the disintegrating type base resin may be used, or both of them may be used. Further, not only at least one of the self-polishing type base resin and the disintegrating type base resin, but also a base resin having non-hydrolyzable and water-insoluble properties may be included.

Specifically, examples of the base resin include (meth) acrylic acid metal salt copolymer, polyester metal salt copolymer, silyl ester-containing copolymer, polysiloxane block-containing metal salt copolymer, and sulfur-containing organo. Polysiloxane block vinyl copolymer, rosin ester resin, rosin soap, rosin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl isobutyl ether copolymer, rubber chloride resin, acrylic resin (Excluding (meth) acrylic acid metal salt copolymers, silyl ester-containing copolymers, polysiloxane block-containing metal salt copolymers, and sulfur-containing organopolysiloxane block vinyl copolymers), styrene-butadiene resins, At least one of polyester-based resin fat (excluding polyester metal salt copolymer), epoxy-based resin, phenol-based resin, synthetic rubber, and petroleum-based resin can be mentioned. Two or more of these may be used. The term "(meth) acrylic" as used herein is a general term for acrylic (acryl) and methacrylic (methaclyl).

The antifouling agent is a material having antifouling property that suppresses the adhesion of aquatic organisms. Specifically, the antifouling agent is not particularly limited, but for example, cuprous oxide, copper pyrithione, zinc pyrithione, copper thiocyanate (rodane copper), copper (metallic copper), 4,5-. Dichloro-2-n-octyl-4-isothiazolin-3-one (abbreviation: DCOIT), 4-bromo-2- (4-chlorophenyl) -5- (trifluoromethyl) -1H-pyrrole-3-carbonitrile (abbreviation: DCOIT) Abbreviation: tralopylyl), borane-nitrogen-based base adduct (pyridinetriphenylborane, 4-isopropylpyridinediphenylmethylborane, etc.), (+/-)-4- [1- (2,3-dimethylphenyl) ethyl]- 1H-imidazole (abbreviation: medetomidin), N- (2,4,6-trichlorophenyl) maleimide, 2,4,5,6-tetrachloroisophthalonitrile, chloromethyl-n-octyldisulfide, 2,3-dichloro At least one of -N- (2', 6'-diethylphenyl) maleimide and 2,3-dichloro-N- (2'-ethyl-6'-methylphenyl) maleimide can be mentioned. Two or more of these may be used.

The adhesive layer 230 is provided, for example, on the back surface side of the base material 210. The material constituting the pressure-sensitive adhesive layer 230 is not particularly limited, and examples thereof include at least one of an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive. Two or more of these may be used. By providing the adhesive layer 230, the strip-shaped body 200 can be easily attached to the outer periphery of the anticorrosion layer 160.

The mode in which the strip 200 is wound around the outer periphery of the anticorrosion layer 160 is not particularly limited, but for example, the following two modes can be adopted.

As shown in FIG. 4A, the strip-shaped body 200 is spirally wound around the outer circumference of the anticorrosion layer 160, for example. As a result, the band-shaped body 200 can be firmly wrapped around the anticorrosion layer 160.

Alternatively, as shown in FIG. 4B, the strip-shaped body 200 may be wound around the outer circumference of the anticorrosion layer 160 by vertical attachment, for example. The term "vertical attachment" as used herein means winding the strip-shaped body 200 so that the longitudinal direction of the strip-shaped body 200 substantially coincides with the axial direction of the dynamic cable 10. As a result, it is possible to suppress twisting of the dynamic cable 10 when the strip-shaped body 200 is wound.

Further, as shown in FIGS. 4A and 4B, the dynamic cable 10 may have, for example, a binder 300. The binder 300 binds the cable core 110, the strip 200, and the like from the outer peripheral side of the strip 200, for example. As a result, it is possible to prevent the band-shaped body 200 from unraveling.

The binder 300 is, for example, a so-called binding band that binds an object. As a result, the binder 300 can be easily bound to the outer peripheral side of the strip-shaped body 200. The binder 300 may be, for example, a wire or the like. Alternatively, the binder 300 may be a rope such as Vectran.

A plurality of binders 300 are arranged, for example, in the axial direction of the dynamic cable 10 at predetermined intervals. The distance between the binders 300 is, for example, 1 m or more and 20 m or less. As a result, the unraveling of the strip-shaped body 200 can be suppressed evenly in the axial direction of the dynamic cable 10. Further, by arranging the binders 300 at intervals in the axial direction of the dynamic cable 10, the desired flexibility of the dynamic cable 10 can be maintained.

The spacing between the binders 300 may be different depending on the position of the dynamic cable 10. For example, the distance between the binders 300 in the float portion 10a of the dynamic cable 10 may be shorter than the distance between the binders 300 in other parts (the part connected to the water equipment 1). As a result, it is possible to make it difficult to unravel the strip-shaped body 200 even if the float portion 10a has a large movement when the water surface equipment 1 moves.

(3) Dynamic Cable Manufacturing Method and Dynamic Cable Laying Method Next, the dynamic cable manufacturing method and the dynamic cable laying method according to the present embodiment will be described with reference to FIG. FIG. 5 is a schematic view showing a laying ship according to the present embodiment. The laying process of the dynamic cable 10 of the present embodiment includes, for example, a manufacturing process of the dynamic cable 10.

(Step 1: Cable intermediate preparation process)
First, the cable intermediate 5 is prepared. The term "cable intermediate 5" as used herein means an intermediate (intermediate member) of the dynamic cable 10 manufactured during the manufacturing process of the dynamic cable. That is, for example, the cable intermediate 5 includes a cable core 110, an interposition 120, a holding tape 130, a seating tape 140, an iron wire exterior 150, and an anticorrosion layer 160 from the center side to the outer peripheral side. It has.

In the present embodiment, for example, in a manufacturing factory on land, a cable intermediate 5 is manufactured using a predetermined manufacturing apparatus. After producing the cable intermediate 5, the cable intermediate 5 is wound around a predetermined cable coil, and the cable coil is mounted on the laying ship 2 described later.

After mounting on the laying ship, the submarine cable and the cable intermediate 5 are connected on the laying ship 2 by using a predetermined dedicated kit.

(Step 2: Protective layer forming step)
Next, using the laying vessel 2 of the present embodiment, the following steps 2 and subsequent steps are performed.

As shown in FIG. 5, the laying vessel 2 of the present embodiment includes, for example, a cable storage area 21, a yagura 22, a cable guide (not shown), a protective layer forming device 23, a binder binding device 24, and a shooter. It has 25 and.

The cable storage area 21 is provided on, for example, the laying ship 2 and has a cable coil around which the above-mentioned cable intermediate 5 is wound and stored.

The yagura 22 is provided vertically above the cable storage area 21, and is configured to lift and support the cable intermediate 5 supplied from the cable storage area 21 vertically above the cable storage area 21.

The cable guide is configured to guide the cable intermediate 5 from, for example, the yagura 22 toward the stern side of the laying ship 2.

The protective layer forming device 23 is configured to form the protective layer 170 so as to surround the outer periphery of the cable core 110 of the cable intermediate 5, for example. Specifically, the protective layer forming device 23 has, for example, a bobbin (not shown) and a cage (not shown). The bobbin, for example, winds and holds the strip 200. The cage holds the bobbin, for example, and is configured to be rotatable in the circumferential direction around the cable intermediate 5.

The binder binding device 24 is configured to bind the binder 300, for example.

The shooter 25 is provided, for example, at the stern of the laying vessel 2, and is configured to send the dynamic cable 10 into the water.

In step 2, first, the cable intermediate 5 is conveyed from the cable storage area 21 toward the stern side of the laying vessel 2 via the yagura 22 and the cable guide.

When the cable intermediate 5 is conveyed and reaches the protective layer forming device 23, the band-shaped body 200 is sent out from the bobbin while rotating the cage around the cable intermediate 5 in the circumferential direction using the protective layer forming device 23. After sending out the band-shaped body 200, the band-shaped body 200 is spirally wound around the outer circumference of the cable core 110 of the cable intermediate 5. As a result, the protective layer 170 is formed on the outer periphery of the cable intermediate 5.

At this time, in the present embodiment, the protective layer forming device 23 is used to selectively form the protective layer 170 in the axial direction of the cable intermediate 5. Specifically, when the dynamic cable 10 is laid in water, the protective layer 170 is selectively formed only in a region where the water depth is relatively shallow. Further, when the dynamic cable 10 is laid in water, the protective layer 170 is selectively formed in a region where the water depth is within 70 m.

(Step 3: Binder binding process)
After the protective layer 170 is formed, the cable intermediate 5 on which the protective layer 170 is formed is conveyed toward the stern side of the laying ship 2, and the binder binding device 24 is used to form the band-shaped body 200 in the region where the protective layer 170 is formed. The binder 300 is bound so as to bind the cable intermediate 5 from the outer peripheral side of the cable. At this time, the binders 300 are sequentially arranged at predetermined intervals in the axial direction of the cable intermediate 5.

As described above, the dynamic cable 10 of the present embodiment is manufactured.

(Step 4: Cable delivery process)
After manufacturing the dynamic cable 10, the shooter 25 is used to send the dynamic cable 10 and the submarine cable into the water.

As described above, the dynamic cable 10 and the submarine cable of the present embodiment are laid underwater. When the dynamic cable 10 having a predetermined length is laid in water, the diver goes underwater and connects the dynamic cable 10 and the water equipment 1. Further, a diver attaches a plurality of buoys 12 and wires 15 to the dynamic cable 10 to form a float portion 10a.

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

(A) The dynamic cable 10 of the present embodiment is provided with a protective layer 170 so as to surround the outer periphery of the cable core 110. As a result, it is possible to suppress the adhesion of aquatic organisms to the dynamic cable 10. By suppressing the adhesion of aquatic organisms to the dynamic cable 10, it is possible to suppress the weight increase of the dynamic cable 10 due to the attachment of aquatic organisms. By suppressing the weight increase of the dynamic cable 10, the linearity of the dynamic cable can be maintained within the designed range. Further, by suppressing the adhesion of aquatic organisms to the dynamic cable 10, the surface of the dynamic cable 10 can be maintained in a smooth state, and a predetermined flexibility of the dynamic cable can be maintained. As a result, when the water equipment 1 moves, the amount of movement of the water equipment 1 can be sufficiently absorbed. As a result, it is possible to suppress the application of excessive tension to the dynamic cable 10 and to prevent the bending radius of the dynamic cable 10 from becoming less than the allowable bending radius.

(B) In the present embodiment, the protective layer 170 is selectively provided in the axial direction of the dynamic cable 10. For example, by selecting the formation region of the protective layer 170 according to the habitat region of the aquatic organism, the adhesion of the aquatic organism to the dynamic cable 10 can be efficiently suppressed. As a result, the linear local collapse of the dynamic cable 10 can be suppressed, and the local decrease in the flexibility of the dynamic cable 10 can be suppressed. As a result, it is possible to stably suppress the application of excessive tension to the above-mentioned dynamic cable 10 and the reduction of the bending radius of the dynamic cable 10. As described above, in the present embodiment, it is possible to efficiently suppress the influence on the dynamic cable 10 due to the adhesion of aquatic organisms.

(C) By selectively forming the protective layer 170 in the axial direction of the dynamic cable 10, the member cost related to the protective layer 170 is reduced as compared with the case where the protective layer 170 is formed over the entire length of the dynamic cable 10. It can be reduced. Further, as compared with the case where the protective layer 170 is formed over the entire length of the dynamic cable 10, the manufacturing process of the dynamic cable 10 having the protective layer 170 can be simplified and shortened.

(D) In the present embodiment, the protective layer 170 is selectively provided only in the shallow region 91 when the dynamic cable 10 is laid in water. Since aquatic organisms tend to adhere to the structure in the shallow region 91, the protective layer 170 is selectively provided only in the shallow region 91 to which aquatic organisms easily adhere, so that the dynamic cable 10 is underwater. It is possible to efficiently suppress the adhesion of organisms.

Further, as a shallow region 91, a protective layer 170 is selectively provided on the float portion 10a of the dynamic cable 10. As described above, the float portion 10a easily moves up and down in the vertical direction and is easily bent due to the movement of the water supply equipment 1. Therefore, by selectively forming the protective layer 170 on the float portion 10a, it is possible to suppress the local collapse of the linearity and the decrease in the flexibility of the float portion 10a. That is, the function of absorbing the movement amount of the water surface equipment 1 as the float portion 10a can be stably maintained.

(E) The protective layer 170 includes a band-shaped body 200. By using the strip-shaped body 200, the strip-shaped body 200 can be wound so as to surround the outer circumference of the cable core 110, and the protective layer 170 can be easily formed. Further, as compared with an extruder that extrudes the protective layer 17 using a predetermined resin composition, the simple protective layer forming device 23 as described above can be used. As a result, for example, the protective layer forming step can be performed on the laying vessel 2, and the dynamic cable 10 can be sent out into the water immediately after the protective layer forming step. That is, it is possible to simplify and shorten the manufacturing process and the laying process of the dynamic cable 10.

(F) Further, by using the strip-shaped body 200 as the protective layer 170, it is possible to easily selectively form the protective layer 170 in the axial direction of the dynamic cable 10.

Here, in the case of extrusion molding the protective layer 17 using a predetermined resin composition, once the extruder is started to operate, the extruder cannot be stopped in the middle of the extrusion process. Therefore, it becomes difficult to selectively form the protective layer 17.

On the other hand, in the present embodiment, by using the strip-shaped body 200 as the protective layer 170, the formation of the protective layer 170 and its stop can be switched at an arbitrary timing. As a result, the protective layer 170 can be easily formed at a position where the protective layer 170 should be formed by a required length while transporting the cable intermediate 5 in the axial direction. As a result, the protective layer 170 can be easily selectively formed in the axial direction of the dynamic cable 10.

(G) The binder 300 binds the cable core 110, the strip 200, and the like from the outer peripheral side of the strip 200. As a result, it is possible to prevent the band-shaped body 200 from unraveling.

Here, when the water supply equipment 1 moves, the dynamic cable 10 absorbs the movement amount of the water supply equipment 1 by changing the alignment as described above. At this time, the band-shaped body 200 is contracted on the inside of the bending of the dynamic cable 10, while the band-shaped body 200 is stretched on the outside of the bending of the dynamic cable 10. If such a state is repeated, the band-shaped body 200 may be gradually peeled off from the anticorrosion layer 160, and the band-shaped body 200 may be unraveled. If the band 200 is melted and a part of the anticorrosion layer 160 is exposed, the above-mentioned effect of suppressing the adhesion of water organisms may not be obtained.

On the other hand, by binding the band-shaped body 200 with the binder 300, even if the alignment of the dynamic cable 10 changes, the band-shaped body 200 is suppressed from being peeled off from the anticorrosion layer 160, and the band-shaped body 200 is suppressed from being unraveled. be able to. This makes it possible to stably maintain the effect of suppressing the adhesion of water organisms.

(5) Modification Example of the Present Embodiment The above-mentioned first embodiment can be modified as a modification shown below, 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 1-1)
In the first embodiment described above, the case where the band-shaped body 200 has the adhesive layer 230 has been described, but the band-shaped body 200 may have a heat-sealing layer instead of the adhesive layer 230. By heating the strip-shaped body 200 after winding it, the strip-shaped body 200 can be brought into close contact with the cable intermediate 5 so as to follow the outer shape of the cable intermediate 5.

(Modification 1-2)
In the first embodiment described above, the case where the strip-shaped body 200 has the adhesive layer 230 has been described, but the strip-shaped body 200 may be configured as a film (sheet) having no adhesive layer. In this case, it is preferable to provide a binder 300 for bundling the strip-shaped body 200. Since the band-shaped body 200 does not have the adhesive layer 230, the layer structure of the band-shaped body 200 can be simplified.

(Modification 1-3)
In the above-mentioned modified example 1-1, the strip-shaped body 200 has a heat-sealing layer instead of the adhesive layer 230, but as in the modified example 1-2, the strip-shaped body 200 is configured as a film, and the base material 210 itself. May have heat-sealing properties. As a result, it is possible to obtain a predetermined adhesion force by heat fusion while simplifying the layer structure of the strip-shaped body 200.

(Modification 1-4)
In the first embodiment described above, the case where the strip 200 has the coating layer 220 has been described, but the strip 200 may contain a repellent that repels aquatic organisms in the base material 210 itself. The repellent is, for example, a material having the property of suppressing neurotransmission of aquatic organisms. Specifically, examples of the repellent include the above-mentioned medetomidine and the like. Since the base material 210 of the strip 200 itself contains a repellent, the paint layer 220 can be omitted, and the layer structure of the strip 200 can be simplified.

(Modification example 1-5)
In the first embodiment described above, the case where the strip 200 has the coating layer 220 containing an antifouling agent has been described, but at least the surface of the strip 200 has flexibility to suppress the adhesion of aquatic organisms. You may be doing it. Specifically, the strip 200 does not have the paint layer 220, and the base material 210 itself may have a predetermined flexibility. Examples of the material of the base material 210 having a predetermined flexibility include silicone rubber and the like. This makes the surface of the strip 200 unstable and suppresses the adhesion of aquatic organisms. Further, even if the aquatic organisms adhere to the band-shaped body 200, the aquatic organisms can be easily dropped from the band-shaped body 200 by the linear change of the dynamic cable 10. Further, since the strip-shaped body 200 does not have the paint layer 220, the layer structure of the strip-shaped body 200 can be simplified.

(Modification example 1-6)
In the first embodiment described above, the case where the protective layer 170 includes the band-shaped body 200 has been described, but the protective layer 170 may include the protector 400.

The dynamic cable 10 of the modified example 1-6 will be described with reference to FIG. FIG. 6 is a cross-sectional view of a part of the dynamic cable according to this modification, which is orthogonal to the axial direction.

As shown in FIG. 6, the protective layer 170 of the present embodiment includes, for example, a tubular protector 400. The protector 400 is fitted to the anticorrosion layer 160 so as to surround the outer periphery of the cable core 110, for example.

Specifically, the protector 400 has, for example, a pair of half-cylinder portions 420, a connecting portion 440, and a fitting portion 460. Each of the pair of half-cylinder portions 420 is formed, for example, in a half-cylindrical shape divided in half by a half-split surface along the longitudinal direction. The connecting portion 440 connects, for example, one ends of the pair of half-cylinder portions 420 in the circumferential direction. The pair of half-cylinder portions 420 are movably connected to each other via the connecting portion 440. The fitting portion 460 is provided, for example, on the other end side of each of the pair of half cylinder portions 420 in the circumferential direction, and is adapted to fit with the other end side of the other half cylinder portion 420.

At least the surface side of the protector 400 has, for example, a property of suppressing the adhesion of aquatic organisms. Further, the protector 400 has, for example, predetermined flexibility and elasticity. Specifically, the protector 400 has, for example, a base material (not shown) and a paint layer (not shown). As the material constituting each of the base material and the paint layer of the protector 400, for example, the same material as the material constituting each of the base material 210 and the paint layer 220 of the strip 200 in the above-described first embodiment may be used. it can. In the protector 400, the above-described modifications 4 and 5 of the first embodiment may be applied.

Further, for example, a plurality of protectors 400 are continuously arranged in the axial direction of the dynamic cable 10. The protectors 400 adjacent to each other in the axial direction of the dynamic cable 10 may be connected to each other.

Further, the protector 400 is configured to be removable, for example. Specifically, each of the pair of half-cylinder portions 420 has a knob portion 422 on one end side (fitting portion 460 side). The protector 400 can be removed from the anticorrosion layer 160 by pulling the knob portion 422.

The laying process of the dynamic cable 10 of the present embodiment includes, for example, a manufacturing process of the dynamic cable 10. In the present embodiment, after the cable intermediate preparation step, for example, a protective layer forming step is performed on the laying vessel 2. In the protective layer forming step, for example, the protector 400 is selectively fitted in the axial direction of the cable intermediate 5 by using a predetermined protector fitting device. As a result, the dynamic cable 10 of the present embodiment is manufactured. After manufacturing the dynamic cable 10, the cable delivery step is performed. As described above, the dynamic cable 10 of the present embodiment is laid in water.

According to the present embodiment, by using the protector 400, the protector 400 can be fitted so as to surround the outer periphery of the cable core 110, and the protective layer 170 can be easily formed. Further, by using the protector 400, it is possible to easily selectively form the protective layer 170 in the axial direction of the dynamic cable 10.

Further, according to the present embodiment, since the protector 400 is detachably configured, if aquatic organisms adhere to the surface of the protector 400, the protector 400 to which the aquatic organisms adhere is removed and a new protector is used. It can be exchanged for 400.

<Second Embodiment of the present disclosure>
Next, a second embodiment of the present disclosure will be described with reference to FIG. 7. FIG. 7 is a schematic view showing a cable laying structure according to the present embodiment.

In the present embodiment, the aspect of the protective layer 170 is different from that of the first embodiment. Hereinafter, as in the modified example of the first embodiment, only the elements different from those of the first embodiment will be described.

(1) Dynamic Cable The configuration of the dynamic cable 10 of the present embodiment will be described.

As shown in FIG. 7, in the present embodiment, a plurality of protective layers 170 are provided, for example, in the axial direction of the dynamic cable 10. The plurality of protective layers 170 include different types depending on the underwater position when the dynamic cable 10 is laid in water, for example.

In the present embodiment, for example, at least two types of protective layers 170 are provided. One of the two types of protective layers 170 is referred to as "first protective layer 172" and the other is referred to as "second protective layer 174". For example, the first protective layer 172 is arranged in the shallow region 91 and the second protective layer 174 is arranged in the deep region 92.

Specifically, for example, the first protective layer 172 is a portion of the dynamic cable 10 located in the shallow region 91, in the vicinity of the connection portion between the dynamic cable 10 and the water supply equipment 1, and in the vicinity of the float portion 10a of the dynamic cable 10. And, it is provided in. On the other hand, for example, the second protective layer 174 is provided in the vicinity of the suspension portion 10b of the dynamic cable 10 and the vicinity of the connection portion of the dynamic cable 10 and the submarine cable as a portion of the dynamic cable 10 located in the deep region 92. It is provided.

Further, in the present embodiment, for example, the first protective layer 172 includes a first band-shaped body 202, and the second protective layer 174 includes a second band-shaped body 204 different from the first band-shaped body 202. The first band-shaped body 202 constituting the first protective layer 172 and the second band-shaped body 204 forming the second protective layer 174 have, for example, different properties from each other as follows.

In this embodiment, the first protective layer 172 and the second protective layer 174 have, for example, different hydrolysis rates or dissolution rates from each other. The "hydrolysis rate or dissolution rate" as used herein means, for example, the rate at which the base resin contained in the respective coating layers 220 of the first strip 202 and the second strip 204 is hydrolyzed or dissolved.

Specifically, the hydrolysis rate or dissolution rate of the first protective layer 172 is slower than, for example, the hydrolysis rate or dissolution rate of the second protective layer 174. As described above, the flow velocity in the shallow region 91 is faster than the flow velocity in the deep region 92. Therefore, in the present embodiment, by slowing down the hydrolysis rate or dissolution rate of the first protective layer 172 arranged in the shallow region 91, the hydrolysis or dissolution of the first protective layer 172 proceeds excessively due to the high flow velocity. Can be suppressed. As a result, it is possible to prevent the life of the first protective layer 172 (duration of effect) from becoming excessively shorter than the life of the second protective layer 174.

On the contrary, the hydrolysis rate or dissolution rate of the first protective layer 172 may be higher than, for example, the hydrolysis rate or dissolution rate of the second protective layer 174. As described above, in the shallow region 91, aquatic organisms are more likely to adhere to the structure than in the deep region 92. Therefore, in the present embodiment, the elution of the antifouling agent can be promoted in the shallow region 91 by increasing the hydrolysis rate or the dissolution rate of the first protective layer 172 arranged in the shallow region 91. As a result, even in the shallow region 91 where aquatic organisms are likely to adhere, the adhesion of aquatic organisms to the dynamic cable 10 can be stably suppressed.

Further, in the present embodiment, the first protective layer 172 and the second protective layer 174 contain, for example, antifouling agents that suppress the adhesion of aquatic organisms in different contents. The term "antifouling agent" as used herein means, for example, an antifouling agent contained in the respective paint layers 220 of the first strip-shaped body 202 and the second strip-shaped body 204.

Specifically, the content of the antifouling agent in the first protective layer 172 is higher than the content of the antifouling agent in the second protective layer 174, for example. For example, even when the hydrolysis rate or dissolution rate of the first protective layer 172 is slowed down as described above, the required amount of protection is prevented by a small amount of hydrolysis or dissolution of the base resin in the first protective layer 172. The pollutant can be eluted. As a result, the effect of suppressing the adhesion of aquatic organisms to the dynamic cable 10 by the first protective layer 172 can be stably maintained.

On the contrary, the content of the antifouling agent in the second protective layer 174 may be higher than the content of the antifouling agent in the first protective layer 172, for example. As described above, the flow velocity in the deep region 92 is slower than the flow velocity in the shallow region 91, and the second protective layer 174 is difficult to hydrolyze or dissolve. Therefore, in the present embodiment, by increasing the content of the antifouling agent in the second protective layer 174, the required amount of the antifouling agent is eluted with a small amount of hydrolysis or dissolution of the base resin of the second protective layer 174. Can be made to. As a result, the effect of suppressing the adhesion of aquatic organisms to the dynamic cable 10 by the second protective layer 174 can be stably maintained.

(2) Dynamic Cable Manufacturing Method and Dynamic Cable Laying Method Next, the dynamic cable manufacturing method and the dynamic cable laying method according to the present embodiment will be described.

The laying process of the dynamic cable 10 of the present embodiment includes, for example, a manufacturing process of the dynamic cable 10. In the present embodiment, after the cable intermediate preparation step, for example, a protective layer forming step is performed on the laying vessel 2.

In the protective layer forming step, for example, a plurality of protective layer forming devices 23 are used, and in each protective layer forming device 23, strips 200 containing different types are set. After setting each strip-shaped body 200, a plurality of protective layers 17 are formed in the axial direction of the cable intermediate 5 by a plurality of protective layer forming devices 23 while transporting the cable intermediate 5 toward the stern side of the laying ship 2. To do.

At this time, in the present embodiment, by shifting the position around which the strip-shaped body 200 is wound from each protective layer forming device 23, a plurality of protective layers 170 are provided according to the underwater position when the dynamic cable 10 is laid in water. , Consists of strips 200 of different types.

After the protective layer forming step, a binder bundling step is performed.

As a result, the dynamic cable 10 of the present embodiment is manufactured. After manufacturing the dynamic cable 10, the cable delivery step is performed. As described above, the dynamic cable 10 of the present embodiment is laid in water.

(3) Effect of the present embodiment According to the present embodiment, a plurality of protective layers 170 are provided in the axial direction of the dynamic cable 10. The plurality of protective layers 170 include different types depending on the underwater position when the dynamic cable 10 is laid underwater. Thereby, the type of each protective layer 170 can be selected so as to be suitable for each underwater position when the dynamic cable 10 is laid underwater. For example, a plurality of protective layers 170 can be formed depending on at least one of the flow velocity at each underwater position, the habitat distribution of aquatic organisms, the type of aquatic organisms, and the like. As a result, the adhesion of aquatic organisms to the dynamic cable 10 can be efficiently suppressed.

(4) Modification Example of the Present Embodiment The above-mentioned second embodiment can be modified as a modification shown below, if necessary. Hereinafter, as in the modified example of the first embodiment, only the elements different from those of the second embodiment will be described.

(Modification 2-1)
In the second embodiment described above, the case where the plurality of protective layers 170 each includes the band-shaped body 200 has been described, but even if at least one of the plurality of protective layers 170 includes the protector 400 of the modified example 1-6. Good.

(Modification 2-2)
In the second embodiment described above, the case where each of the plurality of protective layers 170 includes the strip-shaped body 200 has been described, but any one of the plurality of protective layers 170 is uniformly extruded and covered in the axial direction of the dynamic cable 10. The sheath may be composed of a strip 200 or a protector 400, which is provided so as to surround the outer periphery of the sheath.

<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. The "described embodiment" referred to here means the first embodiment and the second embodiment.

In the above-described embodiment, the case where the iron wire exterior 150 of the dynamic cable 10 has two layers has been described, but the iron wire exterior 150 may be provided with only one layer, or may be provided with three or more layers. May be good.

In the above-described embodiment, the case where the dynamic cable 10 has three cable cores 110 has been described, but the dynamic cable 10 may include a communication cable such as an optical fiber at least in a part thereof.

In the above-described embodiment, the case where the float portion 10a and the suspension portion 10b of the dynamic cable 10 are paired is described, but the pair of the float portion 10a and the suspension portion 10b of the dynamic cable 10 is a plurality of pairs. May be good. In this case, it is preferable that only the float portion 10a farthest from the surface equipment 1 is moored to the bottom of the water. That is, a float portion 10a that is not moored to the water bottom may be provided between the water equipment 1 and the float portion 10a that is moored to the water bottom.

In the above-described embodiment, the case where a plurality of buoys 12 are attached to the dynamic cable 10 has been described, but one buoy 12 may be attached to each float portion 10a of the dynamic cable 10.

Further, in the above embodiment, the case where the water supply equipment 1 is a wind power generation facility is described as an example, but the water surface facility 1 is not limited to a power generation facility such as a wind power generation facility, and may be a substation facility or the like. Further, the water equipment 1 may be installed at sea, on a river, on a lake, or the like.

In the above-described embodiment, the case where the protective layer 170 is provided on the dynamic cable 10 has been described, but the same protective layer as the protective layer 170 of the dynamic cable 10 may be provided on the buoy 12.

In the above-described embodiment, the case where the protective layer 170 is only one layer has been described, but the protective layer 170 may be a plurality of layers. As a result, if aquatic organisms adhere to the surface of the outermost protective layer 170, the protective layer 170 to which the aquatic organisms adhere can be peeled off (removed) to expose the clean protective layer 170.

In the above-described embodiment, the case where the submarine cable and the cable intermediate 5 are connected on the laying ship in the cable intermediate preparation step has been described, but the present invention is not limited to this case. For example, the submarine cable and the cable intermediate 5 may be connected on land and then mounted on the laying vessel 2. Alternatively, the submarine cable and the dynamic cable 10 may be laid (sunk) on the bottom of the water and then connected.

In the above-described embodiment, the case where the laying ship 2 has the cable storage area 21 and the yagura 22 has been described. However, the laying ship 2 includes, for example, a cable storage area 21 and a turntable on which the cable storage area 21 rotates. It may have a container called. In this case, Yagura 11 is omitted.

In the above-described embodiment, the case where the protective layer 170 is formed by the protective layer forming device 23 has been described, but the protective layer 170 may be formed by winding the band-shaped protective layer 170 by a human hand.

In the above-described embodiment, the case where the protective layer forming step (step 2) is performed on the laying vessel 2 has been described, but the present disclosure is not limited to this case. The protective layer forming step (step 2) may be performed, for example, in a factory on land.

In the modified example 1-6 of the first embodiment described above, the case where the protector 400 has a pair of half-cylinder portions 420 has been described, but the protector 400 is not limited to this configuration. The protector 400 may be configured as, for example, a binder that is bound so as to surround the outer periphery of the cable core 110.

In the second embodiment described above, the case where the protective layer 170 includes two types has been described, but more than two types of protective layers 170 may be provided.

In the second embodiment described above, the case where either the first protective layer 172 or the second protective layer 174 is provided over the entire length of the dynamic cable 10 has been described, but at least a part of the dynamic cable 10 (for example, The protective layer 170 may not be provided in the deep region 92 (the region where aquatic organisms do not inhabit).

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

(Appendix 1)
A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
The protective layer is a dynamic cable selectively provided in the axial direction of the dynamic cable.

(Appendix 2)
The dynamic cable according to Appendix 1, wherein the protective layer is selectively provided only in a region where the water depth is relatively shallow when the dynamic cable is laid in water.

(Appendix 3)
The dynamic cable according to Appendix 2, wherein the protective layer is selectively provided in a region where the water depth is within 70 m when the dynamic cable is laid in water.

(Appendix 4)
A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
A plurality of the protective layers are provided in the axial direction of the dynamic cable.
The plurality of protective layers are dynamic cables including different types depending on the underwater position when the dynamic cable is laid in water.

(Appendix 5)
Of the plurality of protective layers, the first protective layer arranged in a region where the water depth is relatively shallow and the second protective layer arranged in a region where the water depth is relatively deep have different hydrolysis rates or dissolutions. The dynamic cable according to Appendix 4, which has a speed.

(Appendix 6)
The dynamic cable according to Appendix 5, wherein the hydrolysis rate or dissolution rate of the first protective layer is slower than the hydrolysis rate or dissolution rate of the second protective layer.

(Appendix 7)
The dynamic cable according to Appendix 5, wherein the hydrolysis rate or dissolution rate of the first protective layer is faster than the hydrolysis rate or dissolution rate of the second protective layer.

(Appendix 8)
Of the plurality of protective layers, the first protective layer arranged in a region where the water depth is relatively shallow and the second protective layer arranged in a region where the water depth is relatively deep suppress the adhesion of aquatic organisms. The dynamic cable according to any one of Supplementary note 4 to Supplementary note 7, which contains antifouling agents in different contents.

(Appendix 9)
The dynamic cable according to Appendix 8, wherein the content of the antifouling agent in the first protective layer is larger than the content of the antifouling agent in the second protective layer.

(Appendix 10)
The dynamic cable according to Appendix 8, wherein the content of the antifouling agent in the second protective layer is larger than the content of the antifouling agent in the first protective layer.

(Appendix 11)
The dynamic cable according to any one of Supplementary note 1 to Supplementary note 10, wherein the protective layer includes a strip-shaped body wound so as to surround the outer periphery of the cable core.

(Appendix 12)
The dynamic cable according to Appendix 11, wherein the strip is a base material itself containing a repellent that repels the aquatic organism.

(Appendix 13)
The dynamic cable according to Appendix 11, wherein at least the surface of the strip has flexibility to suppress the adhesion of the aquatic organisms.

(Appendix 14)
The dynamic cable according to any one of Appendix 11 to Appendix 13, further comprising a cable core and a binder for binding the strip from the outer peripheral side of the strip.

(Appendix 15)
The dynamic cable according to Appendix 14, wherein a plurality of binders are arranged at predetermined intervals in the axial direction of the dynamic cable.

(Appendix 16)
The dynamic cable according to any one of Appendix 1 to Appendix 10, wherein the protective layer includes a tubular protector fitted so as to surround the outer periphery of the cable core.

(Appendix 17)
The dynamic cable according to Appendix 16, wherein the protector is detachably configured.

(Appendix 18)
It is a cable laying structure with a dynamic cable that is flexibly connected to floating floating equipment in water.
The dynamic cable is
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
The protective layer is a cable laying structure selectively provided in the axial direction of the dynamic cable.

(Appendix 19)
It is a cable laying structure with a dynamic cable that is flexibly connected to floating floating equipment in water.
The dynamic cable is
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
A plurality of the protective layers are provided in the axial direction of the dynamic cable.
The plurality of protective layers are cable laying structures including different types depending on the underwater position when the dynamic cable is laid in water.

(Appendix 20)
A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
A method for manufacturing a dynamic cable that selectively forms the protective layer in the axial direction of the cable intermediate.

(Appendix 21)
A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
A method for manufacturing a dynamic cable, wherein the plurality of protective layers are formed of different types depending on the underwater position when the dynamic cable is laid in water.

(Appendix 22)
The method for manufacturing a dynamic cable according to Appendix 20 or Appendix 21, wherein the step of forming the protective layer is performed on a laying ship on which the dynamic cable is laid.

(Appendix 23)
It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
A method for laying a dynamic cable that selectively forms the protective layer in the axial direction of the cable intermediate.

(Appendix 24)
It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
A method for laying a dynamic cable in which the plurality of protective layers are formed of different types depending on the position in the water when the dynamic cable is laid in water.

(Appendix 25)
A dynamic cable laying vessel that lays dynamic cables that are flexibly connected to floating floating equipment in the water.
A cable storage area for storing a cable intermediate comprising a conductor and an insulating layer provided to surround the outer periphery of the conductor.
A protective layer forming device that forms a protective layer that suppresses the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate.
A shooter that sends out the dynamic cable forming the protective layer into the water,
Have,
The protective layer forming device is a ship for laying a dynamic cable that selectively forms the protective layer in the axial direction of the dynamic cable.

(Appendix 26)
A dynamic cable laying vessel that lays dynamic cables that are flexibly connected to floating floating equipment in the water.
A cable storage area for storing a cable intermediate comprising a conductor and an insulating layer provided to surround the outer periphery of the conductor.
A protective layer forming device that forms a protective layer that suppresses the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate.
A shooter that sends out the dynamic cable forming the protective layer into the water,
Have,
A plurality of the protective layer forming devices are provided.
The plurality of protective layer forming devices
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
A dynamic cable laying ship in which the plurality of protective layers are formed of different types depending on the underwater position when the dynamic cable is laid underwater.

1 Water equipment 2 Cable layer 3 Step 4 Step 5 Cable intermediate 10 Dynamic cable 10a Float part 10b Suspension part 12 Buoy 15 Wire 17 Protective layer 21 Cable storage area 23 Protective layer forming device 24 Binder binding device 25 Shooter 91 Shallow area 92 Deep Area 110 Cable core 120 Intervention 130 Holding tape 140 Seat floor tape 150 Iron wire exterior 152 First iron wire exterior 154 Second iron wire exterior 160 Anticorrosion layer 170 Protective layer 172 First protective layer 174 Second protective layer 200 Band shape 202 First band Body 204 Second strip 210 Base material 220 Paint layer 230 Adhesive layer 300 Binder 400 Protector 420 Half-cylinder part 422 part 440 Connecting part 460 Fitting part

Claims (16)

A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
The protective layer is a dynamic cable selectively provided in the axial direction of the dynamic cable. The dynamic cable according to claim 1, wherein the protective layer is selectively provided only in a region where the water depth is relatively shallow when the dynamic cable is laid in water. The dynamic cable according to claim 2, wherein the protective layer is selectively provided in an area where the water depth is within 70 m when the dynamic cable is laid in water. A dynamic cable that is flexibly connected to floating floating equipment in water.
A cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A protective layer that is provided so as to surround the outer circumference of the cable core and suppresses the adhesion of aquatic organisms.
With
A plurality of the protective layers are provided in the axial direction of the dynamic cable.
The plurality of protective layers are dynamic cables including different types depending on the underwater position when the dynamic cable is laid in water. Of the plurality of protective layers, the first protective layer arranged in a region where the water depth is relatively shallow and the second protective layer arranged in a region where the water depth is relatively deep have different hydrolysis rates or dissolutions. The dynamic cable according to claim 4, which has a speed. Of the plurality of protective layers, the first protective layer arranged in a region where the water depth is relatively shallow and the second protective layer arranged in a region where the water depth is relatively deep suppress the adhesion of aquatic organisms. The dynamic cable according to claim 4 or 5, wherein the antifouling agents are contained in different contents. The dynamic cable according to any one of claims 1 to 6, wherein the protective layer includes a band-shaped body wound around the outer periphery of the cable core. The dynamic cable according to claim 7, wherein the strip-shaped body contains a repellent that repels the aquatic organism in the base material itself. The dynamic cable according to claim 7, wherein at least the surface of the strip has flexibility to suppress the adhesion of the aquatic organism. The dynamic cable according to any one of claims 7 to 9, further comprising a cable core and a binder for binding the strip from the outer peripheral side of the strip. The dynamic cable according to any one of claims 1 to 6, wherein the protective layer includes a tubular protector fitted so as to surround the outer periphery of the cable core. A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
A method for manufacturing a dynamic cable that selectively forms the protective layer in the axial direction of the cable intermediate. A method for manufacturing dynamic cables that are flexibly connected to floating floating turbines in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
A method for manufacturing a dynamic cable, wherein the plurality of protective layers are formed of different types depending on the underwater position when the dynamic cable is laid in water. The method for manufacturing a dynamic cable according to claim 12 or 13, wherein the step of forming the protective layer is performed on a laying ship on which the dynamic cable is laid. It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
A method for laying a dynamic cable that selectively forms the protective layer in the axial direction of the cable intermediate. It is a method of laying a dynamic cable that is flexibly connected to a floating water turbine in water.
A step of preparing a cable intermediate having a cable core having a conductor and an insulating layer provided so as to surround the outer periphery of the conductor.
A step of forming a protective layer for suppressing the adhesion of aquatic organisms so as to surround the outer circumference of the cable core of the cable intermediate, and
A process of sending the dynamic cable having the protective layer formed into water, and
Have,
In the step of forming the protective layer,
A plurality of the protective layers are formed in the axial direction of the cable intermediate.
A method for laying a dynamic cable in which the plurality of protective layers are formed of different types depending on the position in the water when the dynamic cable is laid in water.