Manufacturing method of cable construction structure and cable construction intermediate body

Abstract

To stably connect a power cable to an overwater facility.SOLUTION: A manufacturing method of a cable construction structure includes the steps of: preparing a cable construction intermediate body including a power cable, a holding member for holding an outer periphery of the power cable and a suspension terminal provided in an area close to a tip of the power cable; pulling the cable construction intermediate body by the holding member and pulling the cable construction intermediate body into an overwater facility; suspending the power cable by the holding member in the overwater facility in a state in which the holding member is hooked onto a first hook provided on the overwater facility; and hanging the suspension terminal onto a second hook different from the first hook provided on the overwater facility and suspending the power cable by the suspension terminal in the overwater facility.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a cable laying structure and an intermediate cable laying body.

Background Art

[0002] As a cable laying structure in which a power cable laid in water or on the bottom of the water is connected to an above-water facility, various structures have been disclosed. In the cable laying structure, when connecting a power cable to a predetermined device of the above-water facility, a wire retaining device for retaining the iron wire of the power cable may be used to fix the power cable in the above-water facility (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to stably connect a power cable to an above-water facility.

Means for Solving the Problems

[0005] According to one aspect of the present disclosure, there is provided a method for manufacturing a cable laying structure, comprising: preparing an intermediate cable laying body including a power cable, a gripping member that grips the outer periphery of the power cable, and a suspension terminal provided in a region near the tip of the power cable; pulling the intermediate cable laying body by the gripping member and pulling the intermediate cable laying body into the water facility; suspending the power cable by the gripping member in the water facility with the gripping member hooked on a first hook provided in the water facility; and hooking the suspension terminal on a second hook different from the first hook provided in the water facility and suspending the power cable by the suspension terminal in the water facility.

Effect of the Invention

[0006] According to the present disclosure, a power cable can be stably connected to a water facility.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

[0008] [Description of Embodiment of the Present Disclosure] [Findings Obtained by Inventors] First, the findings obtained by the inventors will be described.

[0009] Referring to FIG. 13, a method of manufacturing a cable laying structure according to a comparative example will be described. In the method of manufacturing a cable laying structure according to the comparative example, for example, a cable laying structure is manufactured by the following procedure.

[0010] As shown in FIG. 13(i), in the comparative example, the power cable 100 is pulled by a gripping member 320 that grips the outer periphery of the power cable 100, and the power cable 100 is drawn into the water facility 30.

[0011] Next, as shown in FIG. 13(ii), with the power cable 100 drawn into the water facility 30, a temporary fixing member 960 that grips the outer periphery of the power cable 100 is provided at an intermediate position in the axial direction of the power cable 100. By the temporary fixing member 960, the power cable 100 is temporarily fixed to the gantry 520 of the water facility 30. As a result, the fall of the power cable 100 is suppressed.

[0012] After the temporary fixing is completed, as shown in (iii) of FIG. 13, with the power cable 100 temporarily fixed to the gantry 520, the gripping member 320 is removed from the power cable 100. After removing the gripping member 320, the anticorrosion layer 160 of the power cable 100 is peeled off to expose the iron wire outer sheath 150 of the power cable 100.

[0013] After exposing the iron wire outer sheath 150, as shown in (iv) of FIG. 13, the iron wire retaining device 600 is used to retain the iron wire 151 of the power cable 100. As a result, the power cable 100 is locked to the gantry 520 by the iron wire retaining device 600.

[0014] Thereafter, the power cable 100 is connected to a predetermined device of the water facility 30. Thus, the cable laying structure of the comparative example is manufactured.

[0015] However, the following problems occurred in the manufacturing method of the cable laying structure of the comparative example.

[0016] (Problem 1) In recent years, the power cable 100 has sometimes been connected to the water facility 30 provided at a location with a deep water depth. In this case, since the distance from the water facility 30 to the bottom of the water is long, the load on the power cable 100 between them has increased. Therefore, when the power cable 100 is fixed temporarily by the above-described temporary fixing member 960, the load on the temporary fixing member 960 has increased. As described above, the temporary fixing member 960 is only for temporarily fixing the power cable 100 and does not have sufficient load resistance. Therefore, due to the increase in the load on the above-described temporary fixing member 960, there is a risk that the temporary fixing member 960 may come off and the power cable 100 may fall.

[0017] (Problem 2) In the process of laying the power cable 100, deterioration of the weather or a change in the tidal current may occur. If such deterioration of the weather or a change in the tidal current occurs, the tensile force of the power cable 100 becomes strong. Therefore, under such circumstances, the load on the above-described temporary fixing member 960 has become large. As a result, similar to the above-described problem 1, there is a risk that the power cable 100 may fall.

[0018] (Problem 3) On the pedestal 520 of the water facility 30, it has been difficult for the worker to work on the temporary fixing member 960. In particular, it has been difficult to form the temporary fixing member 960 so that the temporary fixing member 960 has resistance to excessive load or excessive tensile force in the above-described power cable 100. Furthermore, the working time of the worker for the temporary fixing member 960 has become long.

[0019] As in the above comparative examples, in the manufacturing method of the conventional cable laying structure, due to the above-described problems 1 to 3 related to the temporary fixing member 960, it has been difficult to stably connect the power cable 100 to the water facility 30.

[0020] The following disclosure is based on the above findings found by the inventors.

[0021] <Embodiments of the Present Disclosure> Next, embodiments of the present disclosure will be listed and described.

[0022] [1] A method for manufacturing a cable laying structure according to an aspect of the present disclosure is a step of preparing a cable laying intermediate body including a power cable, a gripping member that grips the outer periphery of the power cable, and a suspension terminal provided in a region close to the tip of the power cable; a step of pulling the cable laying intermediate body by the gripping member and pulling the cable laying intermediate body into the water facility; a step of suspending the power cable by the gripping member in the water facility with the gripping member hooked on a first hook provided in the water facility. Hanging the suspension terminal on a second hook different from the first hook provided on the water facility, and suspending the power cable by the suspension terminal within the water facility; It includes. According to this configuration, the power cable can be stably connected to the water facility.

[0023] [2] In the manufacturing method of the cable laying structure described in [1] above, In the step of preparing the cable laying intermediate body, As the power cable, prepare a cable having at least one cable core and an iron wire outer sheath including a plurality of iron wires surrounding the outer periphery of the cable core, After the step of suspending the power cable by the suspension terminal, removing the gripping member from the power cable and stripping the power cable from the outer periphery; The step of retaining the plurality of iron wires of the iron wire outer sheath on the water facility; Removing the suspension terminal from the second hook and connecting the cable core to a predetermined device of the water facility; It further includes. According to this configuration, the power cable can be stably connected to the water facility.

[0024] [3] In the manufacturing method of the cable laying structure described in [1] or [2] above, In the step of preparing the cable laying intermediate body, As the power cable, At least one cable core, An iron wire outer sheath including a plurality of iron wires surrounding the outer periphery of the cable core, A wire inserted in a region excluding the cable core inside the iron wire outer sheath and provided with the suspension terminal at the tip, Prepare a cable having. According to this configuration, a frictional force can be generated between the cable core and the wire over a long axial distance of the cable core within the power cable.

[0025] [4] In the method for manufacturing the cable laying structure according to [3] above, in the step of preparing the cable laying intermediate, as the power cable, a plurality of cable cores are provided by being helically twisted within the power cable, and the wire is linearly arranged in contact with each of the plurality of cable cores at the center of the plurality of cable cores. Prepare a cable. According to this configuration, a well-balanced frictional force can be generated between each of the plurality of cable cores and the wire.

[0026] [5] In the method for manufacturing the cable laying structure according to [3] above, in the step of preparing the cable laying intermediate, as the power cable, prepare a cable in which a plurality of wires are provided. According to this configuration, the supporting force of the power cable can be improved by the plurality of wires.

[0027] [6] In the method for manufacturing the cable laying structure according to [3] or [5] above, in the step of preparing the cable laying intermediate, as the power cable, a plurality of cable cores are provided by being helically twisted within the power cable, and the wire is helically arranged in contact with each of a pair of cable cores among the plurality of cable cores in a region close to the iron wire outer sheath. Prepare a cable. According to this configuration, the supporting force of the power cable by the wire can be further improved.

[0028] [7] In the method for manufacturing the cable laying structure according to [1] or [2] above, In the step of preparing the cable laying intermediate, As the power cable, It includes at least one cable core having a conductor, The hanging terminal is connected to the tip of the conductor of the cable core by compression Prepare a cable. According to this configuration, the conductor of the power cable can be stably pulled by the hanging terminal.

[0029] [8] The cable laying intermediate according to another aspect of the present disclosure is A power cable, A gripping member configured to grip the outer periphery of the power cable and capable of suspending the power cable, A hanging terminal provided in a region close to the tip of the power cable and configured to be able to suspend the power cable separately from the gripping member, And. According to this configuration, the power cable can be stably connected to the water facility.

[0030] [Details of the Embodiment of the Present Disclosure] Next, an embodiment of the present disclosure will be described below with reference to the drawings. It should be noted that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0031] [An Embodiment of the Present Disclosure] (1) Method for manufacturing a cable laying structure (cable connection structure, cable installation structure) With reference to FIGS. 1 to 9, a method for manufacturing the cable laying structure 10 according to the present embodiment will be described. In FIGS. 4 to 9, the inside of the foundation 20 and the water facility 30 is shown. In FIGS. 3 to 9, the hatching of at least a part of the cross section is omitted.

[0032] Hereinafter, the "axial direction" of the power cable 100 refers to the direction along the central axis of the power cable 100, and in some cases, it can be rephrased as the "longitudinal direction". The "radial direction" of the power cable 100 or the like refers to the direction from the central axis of the power cable 100 to the outer circumference, and in some cases, it can be rephrased as the "lateral direction". For cylindrical or tubular members other than the power cable 100, the above terms similar to those of the power cable 100 can be used.

[0033] In the manufacturing method of the cable laying structure 10 according to the present embodiment, a power cable 100 laid underwater or on the seabed is connected to an above-water facility 30.

[0034] Specifically, as shown in FIG. 1, the manufacturing method of the cable laying structure 10 according to the present embodiment includes, for example, a preparation step S10, a cable pulling-in step S20, a first hanging step S30, a second hanging step S40, a cable stripping step S50, a wire fixing step S60, and a connection step S70.

[0035] (S10: Preparation step) First, an above-water facility 30 as a connection target of the power cable 100 is prepared.

[0036] The above-water facility 30 as a connection target of the power cable 100 is configured as, for example, a facility that performs at least one of power generation, power transmission, power transformation, and power distribution on the water (offshore). Specifically, the above-water facility 30 is, for example, an offshore wind power generation facility, an offshore power transformation facility, or the like. Note that the location where the above-water facility 30 is provided may be, for example, not only the sea but also lakes and rivers.

[0037] The water facility 30 is provided, for example, on the foundation 20. The foundation 20 is configured, for example, as a landing type support column that supports the water facility 30. The foundation 20 has, for example, a side wall (peripheral wall) 220 and a hollow portion 240. The side wall 220 is configured, for example, in a cylindrical shape, is erected on the water bottom 90 so that the central axis is along the vertical direction, and supports the water facility 30. The hollow portion 240 is, for example, a gap portion provided inside the cylindrical side wall 220 and communicates with the water facility 30.

[0038] When the preparations such as the installation of the water facility 30 are completed, the cable laying intermediate body 40 is prepared on the laying ship 80. The "cable laying intermediate body 40" as used herein means an intermediate body (intermediate structure) manufactured during the manufacturing process of the cable laying structure 10 in order to connect the power cable 100 to a predetermined device of the water facility 30.

[0039] (Cable laying intermediate body) As shown in FIGS. 2 and 3, the cable laying intermediate body 40 of the present embodiment includes, for example, a power cable 100, a gripping member 320, a suspension terminal 340, and a cable protection portion 400.

[0040] (Power cable) As shown in FIG. 3, the power cable 100 of the present embodiment includes, for example, a wire 360, at least one cable core 110, an interposition 120, a pressing tape 130, a floor tape 140, an iron wire armor (armoring) 150, and an anticorrosion layer (outer covering layer) 160, from the central axis of the power cable 100 toward the outer periphery.

[0041] The cable core 110 is configured, for example, as a CV cable (also known as a Cross-Linked Polyethylene insulated Vinylchloride sheath cable, or XLPE cable), and has, for example, a conductor 111, an internal semiconductive layer (not shown by reference numeral), an insulating layer (not shown by reference numeral), an external semiconductive layer (not shown by reference numeral), a semiconductive tape (not shown by reference numeral), a copper wire (not shown by reference numeral), a holding tape (not shown by reference numeral), and a sheath (not shown by reference numeral).

[0042] In the present embodiment, for example, three cable cores 110 are twisted and provided in the power cable 100.

[0043] As shown in FIG. 2, a cap 180 may be provided at the tip of each cable core 110. Thereby, the intrusion of water into the conductor 111 of the cable core 110 can be suppressed.

[0044] The intervening member 120 is provided so as to fill the space within the circumscribed envelope (circumscribed cylinder) of the three cable cores 110. The intervening member 120 includes, for example, polypropylene yarn.

[0045] The iron wire outer sheath 150 has a plurality of iron wires 151 surrounding the outer periphery of the cable core 110. For example, the plurality of iron wires 151 are spirally wound around the outer periphery of the floor tape 140. Further, the iron wire 151 includes, for example, a galvanized steel wire. Tar may be applied to the outer periphery of the iron wire 151 for rust prevention.

[0046] The iron wire outer sheath 150 may have, for example, a two-layer structure and may have a first iron wire outer sheath 152 and a second iron wire outer sheath 154.

[0047] 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, a polypropylene yarn (not shown in the figure). Incidentally, the anticorrosion layer 160 may have a sheath (not shown in the figure) that is extrusion-coated so as to cover the outer periphery of the polypropylene yarn. The sheath constituting the anticorrosion layer 160 may contain, for example, polyethylene.

[0048] In the present embodiment, as the power cable 100 of the cable laying intermediate body 40, for example, a cable having a wire 360 that is inserted into a region inside the iron wire exterior 150 and excluding the cable wire core 110 and has a suspension terminal 340 provided at the tip is prepared. The wire 360 will be described later together with the suspension terminal 340.

[0049] (Gripping member) The gripping member 320 is configured to be able to grip the outer periphery of the power cable 100 and suspend the power cable 100, for example.

[0050] Specifically, the gripping member 320 is configured as, for example, a so-called "Chinese finger trap". The gripping member 320 has, for example, a braid 322 and a tension part (tension cord) 324.

[0051] The braid 322 is configured by, for example, a wire (not shown in the figure) being knitted into a cylindrical shape. Examples of the wire included in the braid 322 include a hot-dip galvanized iron wire or a stainless steel wire. The braid 322 is provided so as to surround the outer periphery of a region near the tip of the power cable 100.

[0052] The tension part 324 is configured by, for example, a wire constituting a part of the braid 322 extending from the braid 322.

[0053] In the gripping member 320, as the braid 322 is pulled in the axial direction of the braid 322 by the tension portion 324, the braid 322 can be tightened in the radial direction with respect to the power cable 100. Thereby, while gripping the power cable 100 using the gripping member 320, the power cable 100 can be pulled (towed).

[0054] On the other hand, in the gripping member 320, as the tensile force of the braid 322 by the tension portion 324 is relaxed, the braid 322 can be expanded in the radial direction of the power cable 100. Thereby, the gripping member 320 can be easily removed from the power cable 100.

[0055] (Suspension terminal and wire) As shown in FIGS. 2 and 3, the suspension terminal 340 is provided, for example, in a region close to the tip of the power cable 100, and is configured to be able to suspend the power cable 100 separately from the gripping member 320.

[0056] The suspension terminal 340 has, for example, an annular portion (not shown in the figure) containing metal, and is configured such that a second hook 584 described later can be hooked on the annular portion. Examples of the metal included in the suspension terminal 340 include iron and copper.

[0057] In the present embodiment, the suspension terminal 340 is provided, for example, at the tip of a wire 360 inserted into the power cable 100. The suspension terminal 340 is connected to the tip of the wire 360 by compression, for example.

[0058] In the present embodiment, the wire 360 is linearly arranged in contact with each of the three cable cores 110 at the center of the three cable cores 110, for example. Thereby, when the power cable 100 is suspended by the suspension terminal 340, the power cable 100 can be supported by the frictional force between the three cable cores 110 and the wire 360 in the power cable 100.

[0059] In this embodiment, the wire 360 is provided, for example, over the entire axial direction of the cable core 110. Thereby, the frictional force between the cable core 110 and the wire 360 can be generated over the entire axial direction of the cable core 110. As a result, the power cable 100 can be stably supported by the wire 360.

[0060] In this embodiment, the wire 360 is, for example, twisted together with the three cable cores 110 during the manufacture of the power cable 100.

[0061] Although the suspension terminal 340 and the wire 360 having the above configuration do not have load resistance enough to pull the power cable 100 over a long distance, they have sufficient load resistance for the suspension of the power cable 100 in the water facility 30 described later.

[0062] (Cable protection part) As shown in FIGS. 4 and 5 to be described later, the cable laying intermediate body 40 may have, for example, a cable protection part 400.

[0063] The cable protection part 400 is mounted, for example, so as to surround a part of the outer periphery in the axial direction of the power cable 100. The cable protection part 400 is configured to protect, for example, a portion of the power cable 100 that intersects with the side wall 220 of the foundation 20. The cable protection part 400 is configured to regulate the bending of the power cable 100, for example. Further, the cable protection part 400 is configured such that the power cable 100 can be relatively moved with respect to the cable protection part 400 itself in a state where the cable protection part 400 is locked to the side wall 220.

[0064] The cable laying intermediate body 40 having the above configuration may be pre-formed in an onshore factory, for example, before being placed on the laying ship 80. Alternatively, at least a part of the cable laying intermediate body 40 (for example, the gripping member 320 and the suspension terminal 340) may be formed on the offshore laying ship 80.

[0065] (S20: Cable pulling-in process) Once the cable laying intermediate body 40 is prepared, the cable laying intermediate body 40 is pulled by the gripping member 320 and pulled into the water facility 30.

[0066] Specifically, as shown in FIG. 4, first, the towing wire 562 is passed from the winch 540 of the water facility 30 through the pulley 572 of the water facility 30, the hollow portion 240 of the foundation 20, and the cable insertion hole 260 to the laying ship 80 on the water. After the towing wire 562 is passed, the first hook 582 connected to the tip of the towing wire 562 is connected to the gripping member 320 of the cable laying intermediate body 40.

[0067] Next, by towing the towing wire 562 with the winch 540, the cable laying intermediate body 40 is pulled by the gripping member 320, and the tip of the cable laying intermediate body 40 is inserted into the hollow portion 240 of the foundation 20 through the cable insertion hole 260 of the foundation 20.

[0068] When the cable protection portion 400 of the cable laying intermediate body 40 reaches the cable insertion hole 260 of the foundation 20, the cable protection portion 400 is locked to the side wall 220 of the foundation 20.

[0069] After the cable protection portion 400 is locked to the side wall 220, as shown by the dotted line in FIG. 4, a part of the power cable 100 between the cable protection portion 400 and the laying ship 80 is placed on the water bottom 90.

[0070] Next, as shown in FIG. 5, by further towing the towing wire 562 with the winch 540, while maintaining the state where the cable protection portion 400 is locked to the side wall 220 of the foundation 20, the power cable 100 is relatively moved with respect to the cable protection portion 400. Further, in the hollow portion 240 of the foundation 20, by pulling the cable laying intermediate body 40 with the gripping member 320, the cable laying intermediate body 40 is lifted in the foundation 20 and pulled into the water facility 30 above the foundation 20.

[0071] (S30: First Hoisting Step) After the cable laying intermediate body 40 is drawn into the water facility 30, as shown in FIG. 6, the traction wire 562 connected to the first hook 582 is further tractioned by the winch 540, so as to pull the gripping member 320 hooked on the first hook 582. Thereby, the cable laying intermediate body 40 is lifted so that the tip of the power cable 100 is located vertically above the pedestal 520 of the water facility 30. As a result, with the gripping member 320 hooked on the first hook 582 provided on the water facility 30, the power cable 100 is suspended by the gripping member 320 in the water facility 30.

[0072] (S40: Second Hoisting Step) After the power cable 100 is suspended by the gripping member 320 in the water facility 30, as shown in FIG. 7, the suspension terminal 340 is hooked on a second hook 584 different from the first hook 582 provided on the water facility 30, and the power cable 100 is suspended by the suspension terminal 340 in the water facility 30.

[0073] Here, in the present embodiment, for example, a rail 550 is provided along the horizontal direction on the upper part of the water facility 30. A pulley 572 and a slider 574 are provided on the rail 550 so as to be movable along the rail 550. The first hook 582 is movably connected to the pulley 572 via the traction wire 562 as described above. On the other hand, the second hook 584 is connected to the slider 574 via a support wire 564.

[0074] In the second hoisting step S40 of the present embodiment, the first hook 582 is displaced in the horizontal direction from the state of the first hoisting step S30 by moving the pulley 572 along the rail 550.

[0075] On the other hand, by moving the slider 574 along the rail 550, the second hook 584 is moved in the horizontal direction. Thereby, the second hook 584 is brought close to the tip of the cable laying intermediate body 40 in a state where the power cable 100 is suspended by the gripping member 320.

[0076] After the second hook 584 is moved, the suspension terminal 340 is hooked onto the second hook 584. As a result, while maintaining the cable laying intermediate body 40 along a direction close to the vertical direction, the power cable 100 is suspended by the suspension terminal 340. Consequently, it is possible to suppress an overload on the cable laying intermediate body 40.

[0077] (S50: Cable stripping step) When the second suspension step S40 is completed, as shown in FIG. 8, the rotation of the winch 540 is reversed, and the tensile force of the traction wire 562 on the gripping member 320 is relaxed. By relaxing the tensile force, the braid 322 of the gripping member 320 is expanded in the radial direction of the power cable 100. Thereby, the gripping member 320 is removed from the power cable 100.

[0078] After removing the gripping member 320, with the power cable 100 suspended by the suspension terminal 340, the power cable 100 is stripped from the outer periphery. By stripping the anticorrosion layer 160 of the power cable 100, the iron wire exterior 150 of the power cable 100 is exposed.

[0079] (S60: Iron wire retaining step) When the cable stripping step S50 is completed, as shown in FIG. 9, using the iron wire retaining device 600, a plurality of iron wires 151 of the iron wire exterior 150 are folded back and fixed, thereby retaining the plurality of iron wires 151 on the gantry 520 of the water facility 30. The power cable 100 is locked to the gantry 520 by the iron wire retaining device 600. As a result, at the time of the iron wire retaining step S60, the power cable 100 is not only suspended by the above-described suspension terminal 340 but also supported by the iron wire retaining device 600.

[0080] (S70: Connection step) When the iron wire retaining step S60 is completed, the suspension terminal 340 is removed from the second hook 584. As a result, the power cable 100 is in a state of being supported only by the iron wire retaining device 600.

[0081] After that, with the power cable 100 supported by the wire retaining device 600, the cable core 110 is connected to a predetermined device of the water facility 30. Specifically, the cable core 110 is connected to a predetermined device such as an offshore wind power facility or an offshore substation as the water facility 30.

[0082] Thus, the cable laying structure 10 of the present embodiment is manufactured.

[0083] (2) Summary of the present embodiment According to the present embodiment, one or more of the following effects can be achieved.

[0084] (a) In the present embodiment, in the first hanging step S30, with the gripping member 320 hooked on the first hook 582 provided on the water facility 30, the power cable 100 is hung by the gripping member 320 inside the water facility 30. After that, in the second hanging step S40, the hanging terminal 340 is hooked on a second hook 584 different from the first hook 582 provided on the water facility 30, and the power cable 100 is hung by the hanging terminal 340 inside the water facility 30.

[0085] That is, in the second hanging step S40, the member for hanging the power cable 100 is changed from the gripping member 320 to the hanging terminal 340. Thereby, the power cable 100 can be easily and stably held inside the water facility 30 by the hanging terminal 340 without using the unstable temporary fixing member 960 as in the above-described comparative example.

[0086] With the power cable 100 hung by the hanging terminal 340, by removing the gripping member 320, it is possible to make the state where there are no other members on the outer periphery of the power cable 100 over a predetermined axial length from the tip of the power cable 100. Thereby, the cable stripping step S50 can be easily and stably performed.

[0087] Furthermore, even after that, with the power cable 100 suspended by the suspension terminal 340, the iron wire fixing process S60 can be carried out smoothly and stably.

[0088] As a result, in the present embodiment, it becomes possible to stably connect the power cable 100 to the water facility 30.

[0089] (b) In the present embodiment, the suspension terminal 340 can be made a member having sufficient load resistance compared to the temporary fixing member 960 in the above-described comparative example.

[0090] Thereby, in the present embodiment, even if the distance from the water facility 30 to the water bottom 90 becomes long and the load of the power cable 100 between them increases, the suspension terminal 340 can be made to withstand the load of the power cable 100.

[0091] Alternatively, in the present embodiment, even if the weather deteriorates or the tidal current changes and the tensile force of the power cable 100 increases, the suspension terminal 340 can be made to withstand the tensile force of the power cable 100.

[0092] By these, the power cable 100 can be stably held in the water facility 30 by the suspension terminal 340. As a result, it becomes possible to stably prevent the power cable 100 from falling due to an increase in the load or an increase in the tensile force of the power cable 100.

[0093] (c) In the present embodiment, by simply changing the member for suspending the power cable 100 from the gripping member 320 to the suspension terminal 340, the power cable 100 can be held in the water facility 30 without causing any particularly difficult special work. Thereby, while facilitating the work by the worker, it is possible to maintain the resistance to an excessive load or an excessive tensile force in the power cable 100.

[0094] (d) In this embodiment, the suspension terminal 340 of the cable laying intermediate body 40 is attached to the tip of a wire 360 inserted into a region inside the iron wire outer sheath 150 of the power cable 100 and excluding the cable core 110. Thereby, a frictional force can be generated between the cable core 110 and the wire 360 over a long axial distance of the cable core 110 within the power cable 100. Thereby, the power cable 100 can be supported by the wire 360 more firmly than the temporary fixing member 960 that only grips the outer periphery of the power cable 100 in the above-described comparative example.

[0095] (e) In this embodiment, the wires 360 of the cable laying intermediate body 40 are linearly arranged in contact with each of the plurality of cable cores 110 at the center of the plurality of cable cores 110. Thereby, a frictional force can be generated well-balanced between each of the plurality of cable cores 110 and the wire 360 around the central axis of the power cable 100. As a result, when the power cable 100 is suspended by the suspension terminal 340, it is possible to prevent the power cable 100 from rotating or twisting.

[0096] (3) Modifications of this embodiment The above-described embodiment can be modified as follows as a modification example as needed. Hereinafter, only elements different from the above-described embodiment will be described, and elements substantially the same as those described in the above-described embodiment will be denoted by the same reference numerals and their description will be omitted.

[0097] (3-1) Modification example 1 In the preparation step S10 of the modification example 1, for example, as shown in FIGS. 10 and 11, a cable having a plurality of wires 360 is prepared as the power cable 100 of the cable laying intermediate body 40. Here, for example, three wires 360 are provided.

[0098] Furthermore, in Modification 1, each wire 360 is spirally arranged in contact with each of a pair of cable cores 110 among the plurality of cable cores 110 in a region close to the iron wire exterior 150.

[0099] The suspension terminal 340 is connected to the tips of the three wires 360 by compression, for example, with the tips of the three wires 360 joined together.

[0100] (Summary of Modification 1) (a) In Modification 1, since a plurality of wires 360 are provided in the power cable 100 of the cable laying intermediate body 40, the locations where frictional force is generated between the cable core 110 and the wire 360 can be increased compared to the above-described embodiment. As a result, the supporting force of the power cable 100 can be improved by the plurality of wires 360.

[0101] (b) In Modification 1, since each wire 360 is spirally arranged in contact with each of a pair of cable cores 110, the wire 360 can be intricately intertwined with the plurality of cable cores 110. As a result, not only the frictional force between the cable core 110 and the wire 360 but also the retention force due to the entanglement between the wire 360 and the plurality of cable cores 110 can be generated. Consequently, the supporting force of the power cable 100 by the plurality of wires 360 can be further improved.

[0102] (3-2) Modification 2 Referring to FIG. 12, Modification 2 will be described. In FIG. 12, a cross-section of a part of the compression connection portion 382 and the cap 180 described later is shown.

[0103] In the preparation step S10 of Modification 2, for example, as shown in FIG. 12, as the power cable 100 of the cable laying intermediate body 40, the suspension terminal 340 is connected to the tip of the conductor 111 of the cable core 110 by compression.

[0104] Specifically, the suspension terminal 340 has, for example, a compression connection portion 382, a flange 384, and a suspension portion 386. The compression connection portion 382 is connected, for example, by compression to the tip of the conductor 111 of the cable core 110. Three compression connection portions 382 are provided. The flange 384 is fastened, for example, to each of the three compression connection portions 382 by bolts (not shown in the figure), connecting the three compression connection portions 382. The suspension portion 386 is welded, for example, to the upper part of the flange 384 opposite to the compression connection portion 382. The suspension portion 386 has, for example, an annular portion (not shown in the figure) to which the second hook 584 can be hooked.

[0105] (Summary of Modification 2) (a) In Modification 2, since the suspension terminal 340 is connected by compression to the tip of the conductor 111 of the cable core 110, the suspension terminal 340 and the conductor 111 can be joined by the compression force of the suspension terminal 340, which is stronger than the gripping force of the temporary fixing member 960 on the power cable 100 in the above-described comparative example. Thereby, the conductor 111 of the power cable 100 can be stably pulled by the suspension terminal 340.

[0106] (b) In Modification 2, the wire 360 used in the above-described embodiment or Modification 1 can be dispensed with. Thereby, the manufacturing process of the power cable 100 can be simplified in the same manner as in the prior art.

[0107] <Other Embodiments of the Present Disclosure> As described above, the embodiments of the present disclosure have been specifically described. However, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

[0108] In the above-described embodiment, as an example, the case of connecting the power cable 100 to the water facility 30 provided on the foundation 20 has been described. However, the present disclosure is not limited to this case. The above-described embodiment, Modification 1, and Modification 2 may be applied to the case of connecting the power cable 100 to the floating water facility 30.

[0109] In the above-described embodiment, the case where the power cable 100 has three cable cores 110 has been described. However, the present disclosure is not limited to this case. The above-described embodiment, Modifications 1 and 2 may be applied to the case where the power cable 100 has one cable core 110 (for example, in the case of a DC cable). In this case, for example, in the layer in which the optical fiber cable and the dummy cable are interposed among the power cables 100, a wire 360 may be provided instead of the dummy cable.

[0110] In the above-described embodiment, the case where the iron wire exterior 150 of the power cable 100 has two layers has been described. However, only one layer of the iron wire exterior 150 may be provided, or three or more layers may be provided.

[0111] In the above-described embodiment, the case where the rail 550 is provided above the water facility 30 has been described. However, the present disclosure is not limited to this case. Even if the rail 550 is not provided in the water facility 30, a pulley 572 connected to the first hook 582 via a traction wire 562 and a support wire 564 connected to the second hook 584 may be fixed above the water facility 30. If the distance between the pulley 572 and the support wire 564 is within a range of, for example, 10 cm or more and 30 cm or less, the inclination or displacement of the power cable 100 between the first hanging step S30 and the second hanging step S40 does not affect the holding force of the power cable 100 in the water facility 30.

[0112] <Preferred Embodiment of the Present Disclosure> Hereinafter, preferred embodiments of the present disclosure will be appended.

[0113] (Appended Note 1) A step of preparing a cable laying intermediate body including a power cable, a gripping member that grips the outer periphery of the power cable, and a hanging terminal provided in a region close to the tip of the power cable; A step of pulling the cable laying intermediate body by the gripping member and pulling the cable laying intermediate body into the water facility; A step of suspending the power cable by the gripping member in the water facility with the gripping member hooked on the first hook provided on the water facility; A step of hooking the suspension terminal on a second hook different from the first hook provided on the water facility and suspending the power cable by the suspension terminal in the water facility; comprising A manufacturing method of a cable laying structure.

[0114] (Appendix 2) In the step of preparing the cable laying intermediate body, As the power cable, a cable having at least one cable core and an iron wire outer sheath including a plurality of iron wires surrounding the outer periphery of the cable core is prepared, After the step of suspending the power cable by the suspension terminal, a step of removing the gripping member from the power cable and stripping the power cable from the outer periphery; A step of retaining the plurality of iron wires of the iron wire outer sheath on the water facility; A step of removing the suspension terminal from the second hook and connecting the cable core to a predetermined device of the water facility; further comprising The manufacturing method of the cable laying structure according to Appendix 1.

[0115] (Appendix 3) In the step of preparing the cable laying intermediate body, As the power cable, at least one cable core, an iron wire outer sheath including a plurality of iron wires surrounding the outer periphery of the cable core, a wire inserted into a region inside the iron wire outer sheath and excluding the cable core and having the suspension terminal provided at the tip, preparing a cable having The manufacturing method of the cable laying structure according to Appendix 1 or Appendix 2.

[0116] (Appendix 4) In the step of preparing the cable laying intermediate, As the power cable, The cable cores are twisted spirally within the power cable and a plurality of them are provided, The wire is linearly arranged in contact with each of the plurality of cable cores at the center of the plurality of cable cores. Prepare a cable The manufacturing method of the cable laying structure described in Appendix 3.

[0117] (Appendix 5) In the step of preparing the cable laying intermediate, As the power cable, prepare a cable in which a plurality of the wires are provided. The manufacturing method of the cable laying structure described in Appendix 3.

[0118] (Appendix 6) In the step of preparing the cable laying intermediate, As the power cable, The cable cores are twisted spirally within the power cable and a plurality of them are provided, The wire is spirally arranged in contact with each of the pair of cable cores among the plurality of cable cores in a region close to the iron wire outer sheath. Prepare a cable The manufacturing method of the cable laying structure described in Appendix 3 or Appendix 5.

[0119] (Appendix 7) In the step of preparing the cable laying intermediate, As the power cable, prepare a cable in which the wire is provided over the entire axial direction of the cable core. The manufacturing method of the cable laying structure described in any one of Appendices 3 to 6.

[0120] (Appendix 8) In the step of preparing the cable laying intermediate, As the power cable, Comprising at least one cable core having a conductor, wherein the suspension terminal is connected to the tip of the conductor of the cable core by compression Prepare a cable A method for manufacturing the cable laying structure according to appendix 1 or appendix 2.

[0121] (Appendix 9) In the step of suspending the power cable by the gripping member, By pulling the towing wire connected to the first hook by a winch, the gripping member hooked on the first hook is pulled, In the step of stripping the power cable from the outer periphery, The rotation of the winch is reversed, and the tension of the towing wire on the gripping member is relaxed to remove the gripping member A method for manufacturing the cable laying structure according to any one of appendices 1 to 8.

[0122] (Appendix 10) In the step of suspending the power cable by the suspension terminal, The second hook is brought close to the tip of the cable laying intermediate body in a state where the power cable is suspended by the gripping member, and the suspension terminal is hooked on the second hook, so that the cable laying intermediate body is maintained along a direction close to the vertical direction, and the power cable is suspended by the suspension terminal A method for manufacturing the cable laying structure according to any one of appendices 1 to 9.

[0123] (Appendix 11) A power cable, A gripping member configured to grip the outer periphery of the power cable and capable of suspending the power cable, A suspension terminal provided in a region close to the tip of the power cable and configured to be able to suspend the power cable separately from the gripping member, Comprising Cable laying intermediate body.

Explanation of reference numerals

[0124] 10 Cable laying structure 20 Foundation 30 Water equipment 40 Cable laying intermediate body 80 Laying ship 90 Seabed 100 Power cable 110 Cable core 111 Conductor 120 Interposition 130 Pressing tape 140 Seating tape 150 Iron wire outer covering 151 Iron wire 152 First iron wire outer covering 154 Second iron wire outer covering 160 Anti-corrosion layer 180 Cap 220 Side wall 240 Hollow part 260 Cable insertion hole 320 Gripping member 322 Braiding 324 Tensile part 340 Suspension terminal 360 Wire 382 Compression connection part 384 Flange 386 Suspension part 400 Cable protection part 520 Stand 540 Winch 550 Rail 562 Towing wire 564 Support wire 572 Pulley 574 Slider 582 First hook 584 Second hook 600 Iron wire retaining device 960 Temporary fixing member

Claims

1. A step of preparing a cable laying intermediate body including a power cable, a gripping member that grips the outer periphery of the power cable, and a suspension terminal provided in a region near the tip of the power cable; A step of pulling the cable laying intermediate body by the gripping member and drawing the cable laying intermediate body into the water facility; A step of suspending the power cable by the gripping member in the water facility with the gripping member hooked on a first hook provided in the water facility; A step of hooking the suspension terminal on a second hook different from the first hook provided in the water facility and suspending the power cable by the suspension terminal in the water facility; Comprising A method for manufacturing a cable laying structure.

2. In the step of preparing the cable laying intermediate body, As the power cable, a cable having at least one cable core and an iron wire outer covering including a plurality of iron wires surrounding the outer periphery of the cable core is prepared; After the step of suspending the power cable by the suspension terminal, a step of removing the gripping member from the power cable and stripping the power cable from the outer periphery; A step of retaining the plurality of iron wires of the iron wire outer covering in the water facility; A step of removing the suspension terminal from the second hook and connecting the cable core to a predetermined device in the water facility; Further comprising The method for manufacturing a cable laying structure according to Claim 1.

3. In the step of preparing the cable laying intermediate body, As the power cable, At least one cable core, An iron wire outer covering including a plurality of iron wires surrounding the outer periphery of the cable core, A wire inserted in a region inside the iron wire outer covering and excluding the cable core and having the suspension terminal provided at the tip; Prepare a cable having The method for manufacturing a cable laying structure according to Claim 1 or Claim 2.

4. In the step of preparing the cable laying intermediate body, As the power cable, The cable cores are twisted in a spiral shape in the power cable and a plurality of them are provided, The wire is linearly arranged in contact with each of the plurality of cable cores at the center of the plurality of cable cores. Prepare a cable The method for manufacturing a cable laying structure according to Claim 3.

5. In the step of preparing the cable laying intermediate body, Prepare a cable in which a plurality of the wires are provided as the power cable. The method for manufacturing the cable laying structure according to claim 3.

6. In the step of preparing the cable laying intermediate body, As the power cable, a plurality of the cable cores are provided by being spirally twisted within the power cable, the wires are spirally arranged in contact with each of a pair of the cable cores among the plurality of cable cores in a region close to the iron wire exterior. Prepare a cable. The method for manufacturing the cable laying structure according to claim 3.

7. In the step of preparing the cable laying intermediate body, As the power cable, comprising at least one cable core having a conductor, the suspension terminal is connected to the tip of the conductor of the cable core by compression. Prepare a cable. The method for manufacturing the cable laying structure according to claim 1 or claim 2.

8. A power cable, a gripping member configured to grip the outer periphery of the power cable and capable of suspending the power cable, a suspension terminal provided in a region close to the tip of the power cable and configured to be capable of suspending the power cable separately from the gripping member, comprising a cable laying intermediate body.

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