How to work

Abstract

The object is to provide an installation method with improved workability. [Solution] The system comprises a mooring step S1 for mooring the ship, and an installation step S4 for installing and fixing a cable laying unit used for cable laying to the ship moored in the mooring step S1, and the cable laying unit is removable from the ship.

Description

[Technical Field]

[0001] The present disclosure provides: work Regarding the method. [Background technology]

[0002] Conventionally, cables have been laid using ships. US Patent No. 5,949,949 discloses a cable laying device that temporarily converts a vessel, such as a cargo ship or a sailing vessel, for cable laying. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-28094 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, there is room for improvement in making such changes.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and provides a method for improving workability. work The present invention aims to provide a method. [Means for solving the problem]

[0006] An installation method according to one aspect of the present disclosure includes a mooring step of mooring a ship, and an installation step of installing and fixing a cable laying unit used for cable laying to the ship moored in the mooring step, wherein the cable laying unit is removable from the ship. [Effects of the Invention]

[0007] According to the present disclosure, workability is improved. work A method can be provided. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a cable laying unit according to a first embodiment. [Figure 2] FIG. 1 is a perspective view showing a ship according to a first embodiment. [Figure 3] FIG. 1 is a schematic diagram showing the installation of a cable laying unit on a ship. [Figure 4] FIG. 3 is a diagram showing a flow of a first example of an installation method according to the first embodiment. [Figure 5] FIG. 10 is a diagram showing a flow of a second example of the installation method according to the first embodiment. [Figure 6] FIG. 10 is a diagram showing a flow of an installation method according to a second embodiment. [Figure 7] FIG. 10 is a diagram showing a flow of an installation method according to a third embodiment. [Figure 8] FIG. 10 is a perspective view showing a ship according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) An installation method according to an embodiment of the present disclosure will be described below with reference to the drawings. The installation method according to the first embodiment is carried out, for example, when laying a submarine cable using a ship. Hereinafter, in the first embodiment, unless otherwise specified, the term "cable" refers to a submarine cable. The cable may be transported to the laying site by, for example, a ship. Then, at the laying site, the cable may be appropriately unwound from the ship and laid on the seabed. That is, in the first embodiment, laying a cable may mean laying a new cable on the seabed where no cable has been laid before. In the first embodiment, laying a cable may mean, for example, pulling up a damaged cable that has already been laid on the seabed, repairing it, and then re-laying it on the seabed. In this case, the work of repairing the cable may be carried out on a ship, for example.

[0010] (Configuration used for laying cables) A configuration used for laying the cable C according to the first embodiment will be described. FIG. 1 is a perspective view showing a cable laying unit 1 according to the first embodiment. FIG. 2 is a perspective view showing the boat 2 according to the first embodiment. FIG. 3 shows the installation of the cable laying unit 1 on the ship 2. The cable-laying unit 1 shown in Figure 1 is installed and used on a ship 2 shown in Figure 2. In the first embodiment, the laying of cable C is carried out by the cable-laying unit 1 installed on the ship 2. As shown in Figure 3, the cable-laying unit 1 is installed by being lifted by a crane 3 and placed on the ship 2. In the example shown in Figure 3, the crane 3 is provided on a crane ship 4 located on the sea. However, the crane 3 may also be a crawler crane located on land, or any other equipment may be used. The cable-laying unit 1 shown in FIG. 1 and the ship 2 shown in FIG. 2 will now be described.

[0011] The cable-laying unit 1 shown in Figure 1 is a unit used to lay a cable C. In the first embodiment, the cable-laying unit 1 is a package of multiple devices and facilities used to lay the cable C. In this embodiment, the cable-laying unit 1 is installed on a ship 2 for use. As shown in FIG. 1, the cable laying unit 1 includes a cable chute 11 , a tensioner 12 , a splice container 13 , a rotary table 14 , and a cable quadrant 15 .

[0012] The cable chute 11 is one of the devices included in the cable-laying unit 1. The cable chute 11 guides the cable C being let out into the sea and the cable C being pulled up to the surface from the seabed between the seabed and the cable-laying unit 1. Specifically, the cable chute 11 may, for example, guide the cable C being let out into the sea from the cable quadrant 15 toward the seabed. The cable chute 11 may also, for example, guide the cable C being pulled up to the surface from the seabed toward the cable quadrant 15.

[0013] The cable-laying unit 1 is provided with two cable chutes 11. That is, as shown in Fig. 1, the cable chutes 11 include a first cable chute 11a and a second cable chute 11b. The first cable chute 11a is one of the cable chutes 11 provided in the cable-laying unit 1. The first cable chute 11a guides, for example, the cable C that is reeled out into the sea. The second cable chute 11b is the other of the cable chutes 11 provided in the cable-laying unit 1. The second cable chute 11b, for example, guides the cable C that is pulled up from the seabed to the surface of the sea.

[0014] In the first embodiment, the first cable chute 11a and the second cable chute 11b may have the same configuration. For example, the first cable chute 11a may guide the cable C being pulled up from the seabed to the surface of the ocean, and the second cable chute 11b may guide the cable C being paid out into the ocean. The uses of the first cable chute 11a and the second cable chute 11b may be switched as appropriate depending on the process of laying the cable C, or they may be used simultaneously for the same purpose.

[0015] In the first embodiment, the cable chute 11 is preferably arranged to face the stern of the ship 2 on which the cable-laying unit 1 is installed. In other words, the cable C is preferably arranged to be let out or pulled up into the sea from the stern side of the ship 2.

[0016] The tensioner 12 is one of multiple devices included in the cable-laying unit 1. The tensioner 12 has the function of letting out the cable C from the rotary table 14 and the function of winding the cable C onto the rotary table 14. The tensioner 12 also has the function of applying tension to the cable C being let out into the sea. In this way, the tensioner 12 prevents the cable C, which has been let out into the sea from the cable-laying unit 1, from buckling under its own weight before it reaches the seabed. The tensioner 12 may also have the function of winding up the cable C that is being pulled up from the seabed to the surface.

[0017] The splicing container 13 is one of the devices included in the cable-laying unit 1. The splicing container 13 is used to splice a cable C that has been pulled up from the seabed to the surface of the ocean with a new cable C. In other words, the splicing container 13 is used to splice cables C together in a splicing step S8, which will be described later. The splicing container 13 accommodates, for example, the ends of the cable C that has been pulled up from the seabed to the surface of the sea and the ends of a new cable C. Then, the ends of the cables C accommodated in this manner are spliced ​​together inside the splicing container 13. Inside the splicing container 13, the cables C may be spliced ​​by a worker, or the cables C may be spliced ​​by an industrial robot or the like.

[0018] The rotary table 14 is one of several devices included in the cable-laying unit 1. The rotary table 14 is a part around which the cable C is wound when it is paid out into the sea or pulled up from the seabed to the surface. The rotary table 14 is provided to prevent the cable C from becoming tangled or bulky in the cable-laying unit 1. The rotary table 14 may be rotatable in accordance with the cable C being wound or paid out.

[0019] The cable quadrant 15 is one of the devices included in the cable laying unit 1. The cable quadrant 15 is an arc-shaped member that guides the cable C being paid out into the sea or the cable C being pulled up to the surface from the seabed between the cable chute 11 and the splicing container 13 or the turntable 14 by bringing the cable C into contact with the arc-shaped portion 15A shown in FIG. 1 along the arc-shaped portion. Specifically, the cable quadrant 15 guides, for example, the cable C being paid out into the sea from the turntable 14 toward the cable chute 11. The cable quadrant 15 may also guide, for example, the cable C being pulled up to the surface from the seabed from the cable chute 11 toward the turntable 14 or the splicing container 13. The cable quadrant 15 is provided to prevent the cable C being paid out into the sea or pulled up to the surface from becoming tangled on the cable laying unit 1.

[0020] The cable quadrant 15 is preferably provided on the opposite side of the cable laying unit 1 from the cable chute 11, as shown in Figure 1. That is, the cable quadrant 15 is preferably oriented toward the bow of the ship 2 on which the cable laying unit 1 is installed. This preferably makes it easier to guide the cable C between the cable chute 11 and the cable quadrant 15.

[0021] The cable quadrant 15 may also be used to lower the end of the cable C, or the cable C whose both ends have been connected in the joining step S8 described below, from the ship to the seabed. At this time, the cable quadrant 15 may be detached from the cable laying unit 1 with the cable C in contact with the arc-shaped portion 15A shown in FIG. 1, for example, and moved into the sea together with the cable C. At this time, the cable quadrant 15 may be held by a crane or winch (not shown). In this way, moving the cable quadrant 15 into the sea together with the cable C may prevent the cable C from buckling when being lowered from the sea to the seabed.

[0022] The cable quadrant 15 may also be used to pull the cable C from the seabed onto a ship. At this time, the cable C may be brought into contact with the arc-shaped portion 15A of the cable quadrant 15 beforehand underwater, for example. In this state, the cable quadrant 15 may be pulled from underwater to the surface, thereby pulling the cable C from underwater to the surface. This may prevent the cable C from buckling when being pulled from the seabed to the surface.

[0023] The cable-laying unit 1 according to the first embodiment is made up of the above components. A cable-laying unit 1 configured in this way may be removable from the ship 2. Specifically, the cable-laying unit 1 may be attached to the ship 2 by, for example, welding or mechanical joining (i.e., a "joint that connects by mechanical action," such as bolting or twist locks), and thus may be removable from the ship 2. This makes it possible, for example, to install the cable-laying unit 1 on a general-purpose ship 2 when a rapid response is required to repair cable C. This therefore makes it easier to respond more quickly than, for example, arranging for a ship 2 equipped with a configuration equivalent to the cable-laying unit 1. Furthermore, because the cable-laying unit 1 is detachable from the ship 2, the ship 2 can be used for other purposes. Furthermore, costs can be reduced compared to building a ship 2 equipped with a configuration equivalent to the cable-laying unit 1 of the first embodiment.

[0024] The cable-laying unit 1 is installed on the ship 2 shown in Figure 2. In the first embodiment, the ship 2 may be, for example, a barge or a self-propelled ship. In the following description, the ship 2 will be described as being a known barge. As shown in FIG. 2, the ship 2 according to the first embodiment includes a main body 21 and a thruster 22.

[0025] The main body 21 is a main component of the ship 2. The main body 21 includes a deck D. In the first embodiment, the cable-laying unit 1 is installed in an installation step S4 described below on the deck D of the ship 2 that is moored in a mooring step S1 described below.

[0026] The thrusters 22 are propulsion devices provided to adjust the orientation and position of the ship 2 at sea. In the first embodiment, the thrusters 22 are provided at each of the four corners of the main body 21, as shown in FIG. 2 . This preferably makes it easier to adjust the orientation of the ship 2 using the thrusters 22. In the first embodiment, the thrusters 22 may be detachable from the ship 2. Specifically, the thrusters 22 may be attached to the ship 2 by, for example, welding or mechanical joining (i.e., "jointing that connects by mechanical action," such as bolting or twist locking), thereby making them detachable from the ship 2. This may allow the ship 2 to be used for purposes different from those in the first embodiment, for example.

[0027] In the first embodiment, the thruster 22 is installed on the ship 2 in the installation step S4. As a result, the ship 2 moored in the mooring step S1 includes a first thruster 22a and a second thruster 22b. The first thruster 22a is one of the thrusters 22 provided at the four corners of the ship 2 as described above. The second thruster 22b is one of the thrusters 22 provided at the four corners of the ship 2 as described above, other than the first thruster 22a. The first thruster 22a and the second thruster 22b have the same configuration. The components described above constitute the ship 2 according to the first embodiment. In the first embodiment, the ship 2 has a cable-laying unit 1 installed thereon and is used for work of laying or repairing a cable C at sea.

[0028] (Installation method) Next, an explanation will be given of the installation method according to the first embodiment. As described above, in the first embodiment, laying a cable C may mean laying a new cable C on the seabed where no cable C has been laid, or may mean pulling up a damaged cable C that has already been laid on the seabed to the surface, repairing it, and then re-laying it on the seabed. The installation method according to the first embodiment will be described in detail below, taking as a first example an example in which a new cable C is laid, and as a second example an example in which the cable C is repaired and re-laid.

[0029] (First example of installation method) FIG. 4 is a diagram showing a flow of a first example of an installation method according to the first embodiment. The installation method according to the first example is a method of laying a new cable C on the seabed where no cable C has been laid. The installation method according to the first example shown in FIG. 4 includes a mooring step S1, a preparation step S2, a movement step S3, an installation step S4, a laying step S5, and a removal step S6.

[0030] The mooring step S1 is a step of mooring the ship 2. In the mooring step S1, the ship 2 may be moored to a quay P such as a wharf, for example, as shown in Fig. 3. In this embodiment, mooring the ship 2 to the quay P may include, for example, docking at the quay P. The mooring step S1 may be performed, for example, before the cable laying unit 1 is installed on the ship 2 by the installation step S4, or after work by the cable laying unit 1 is completed and before the cable laying unit 1 is removed from the ship 2 by the removal step S6. In the case where the mooring step S1 is performed before the installation step S4, when the ship 2 is moored to the quay P, the orientation of the bow and stern of the ship 2 may be aligned with the orientation of the cable laying unit 1 prepared at the quay P in the preparation step S2, for example.

[0031] The preparation step S2 is a step in which the cable-laying unit 1 is prepared at the quay P. The cable-laying unit 1 that is installed in the installation step S4 is the cable-laying unit 1 that is prepared at the quay P in the preparation step S2. When the cable-laying unit 1 is prepared at the quay P in the preparation step S2, it is preferable that the orientation of the cable-laying unit 1 be aligned with the orientation of the ship 2 that will be moored to the quay P in the mooring step S1. That is, for example, it is preferable that the stern side of the ship 2 and the side of the cable chute 11 of the cable-laying unit 1 be aligned. In the preparation step S2, one or more cable-laying units 1 may be prepared. When more than one cable-laying unit 1 is prepared, the cable-laying units 1 may be installed on more than one ship 2 in succession. In the first embodiment, the mooring step S1 and the preparation step S2 may be performed in any order, or may be performed simultaneously.

[0032] In the moving step S3, the cable-laying unit 1 prepared on the quay P in the preparation step S2 is moved from the quay P onto the ship 2 by the crane 3. The cable-laying unit 1 installed in the installation step S4 is the cable-laying unit 1 moved in the moving step S3. In the moving step S3, the cable-laying unit 1 is preferably moved in a state where it is appropriately aligned with respect to the ship 2.

[0033] The installation step S4 is a step of installing and fixing the cable-laying unit 1 to the ship 2 moored in the mooring step S1. In the first embodiment, the first thruster 22a and the second thruster 22b may also be installed together with the cable-laying unit 1 to the ship 2 moored in the mooring step S1 in the installation step S4.

[0034] In installation step S4, the cable-laying unit 1 is preferably installed on deck D of the ship 2 moored in mooring step S1 so that it is located between the first thruster 22a and the second thruster 22b. In other words, the cable-laying unit 1 is preferably installed between the left and right thrusters 22 of the thrusters 22 provided at the four corners of the ship 2. Furthermore, in the installation step S4, the cable-laying unit 1 is preferably installed on the deck D of the ship 2 moored in the mooring step S1 so that the tensioner 12 is located between the first thruster 22a and the second thruster 22b. In other words, when the cable-laying unit 1 is installed on the ship 2, the tensioner 12 of the cable-laying unit 1 is preferably installed between the thrusters 22 located on the left and right sides of the ship 2. Furthermore, in the installation step S4, the cable-laying unit 1 is preferably installed on the deck D of the ship 2 moored in the mooring step S1 so that the cable chute 11 is located between the first thruster 22a and the second thruster 22b. In other words, when the cable-laying unit 1 is installed on the ship 2, the cable chute 11 of the cable-laying unit 1 is preferably installed between the thrusters 22 located on the left and right sides of the ship 2.

[0035] The laying step S5 is a step in which the cable C wound around the rotary table 14 of the cable-laying unit 1 is unwound and laid on the seabed. It is preferable that the cable C is in a state of being wound around the rotary table 14 at least at the time of the installation step S4.

[0036] In the laying step S5, first, the cable C is transported to the laying site by the ship 2 on which the cable-laying unit 1 is installed. Then, at the laying site, the cable C is paid out into the sea from the rotary table 14 via the cable quadrant 15 and the cable chute 11. At this time, the cable C may be paid out into the sea via either the first cable chute 11a or the second cable chute 11b. Furthermore, to prevent the cable C from buckling due to its own weight as it moves into the sea, it is preferable that tension be applied to the cable C being paid out into the sea by a tensioner 12.

[0037] The removal step S6 is a step of removing the cable-laying unit 1, which was installed on the ship 2 in the installation step S4, from the ship 2. In the first embodiment, the first thruster 22a and the second thruster 22b may also be removed from the ship 2 in the removal step S6 together with the cable-laying unit 1, which was installed on the ship 2 in the installation step S4. The removing step S6 may be performed, for example, after completing the laying of the cable C in the laying step S5 and after the ship 2 has moored again to the quay P where the ship 2 was moored in the mooring step S1. Through the above steps, the cable C according to the first example is laid.

[0038] (Second example of installation method) FIG. 5 is a diagram showing a flow of a second example of the installation method according to the first embodiment. The installation method according to the second example is a method in which a cable C that has already been laid on the seabed and has been damaged is pulled up to the surface, repaired, and then re-laid on the seabed. The installation method according to the second example shown in FIG. 5 includes a mooring step S1, a preparation step S2, a moving step S3, an installation step S4, a lifting step S7, a joining step S8, a re-laying step S9, and a removal step S6. In the second example, the mooring step S1, the preparation step S2, the movement step S3, the installation step S4, and the removal step S6 are the same as those in the first example, and therefore their explanations will be omitted.

[0039] The raising step S7 is a step of raising the cable C laid on the seabed to the sea surface. In the raising step S7, first, the ship 2 on which the cable-laying unit 1 is installed is moved to a place where the cable C will be raised. Then, the cable C to be repaired is raised from the seabed to the sea surface and moved to the joining container 13 via the cable chute 11 and the cable quadrant 15. At this time, the cable C may be raised from the seabed to the sea surface via either the first cable chute 11a or the second cable chute 11b.

[0040] The joining step S8 is a step of joining the cable C that has been pulled up to the sea in the pulling-up step S7 to a new cable C. That is, the joining step S8 is a step of repairing the cable C. In the splicing step S8, the repair of the cable C may be performed, for example, as follows. That is, first, the damaged portion is removed from the cable C that needs repair. Then, a new cable C is spliced ​​in place of the portion removed from the cable C. At this time, it is preferable that the length of the new cable C to be spliced ​​is the same as the portion removed from the cable C. Furthermore, it is preferable that the portion of the new cable C other than the end to be spliced ​​to the cable C that needs repair is pre-laid, for example, in the location where the removed cable C was laid. In this state, the new cable C is connected to the cable C that needs repair, and the process proceeds to the re-laying step S9 described next.

[0041] The re-laying step S9 is a step in which the cable C, whose repair has been completed in the joining step S8, is re-laid on the seabed. That is, the cable C, whose repair has been completed, is paid out into the sea via the cable quadrant 15 and the cable chute 11. At this time, the cable C may be paid out into the sea via either the first cable chute 11a or the second cable chute 11b, whichever was not used in the pulling-up step S7. Also, in the re-laying step S9, the cable quadrant 15 may be detached from the cable laying unit 1 as described above and moved into the sea together with the cable C. In this way, in the work of repairing the cable C, both the first cable chute 11a and the second cable chute 11b may be used. The installation method according to the first embodiment is carried out through the above steps.

[0042] As explained above, according to the installation method of the first embodiment, in mooring step S1, the ship 2 is moored. In installation step S4, the cable-laying unit 1 used to lay the cable C is installed and fixed to the ship 2 moored in mooring step S1. This allows the work of installing the cable-laying unit 1 on the ship 2 to be carried out while the ship 2 is moored. This means that the cable-laying unit 1 can be installed reliably on the ship 2. This improves workability. Furthermore, in the installation method according to the first embodiment, the cable-laying unit 1 is detachable from the ship 2. This allows, for example, after the work of laying cable C using the ship 2 is completed, to remove the cable-laying unit 1 from the ship 2, thereby making it possible to reuse the ship 2 for purposes other than laying cable C.

[0043] Furthermore, the cable-laying unit 1 is a package of multiple pieces of equipment used to lay the cable C. This means that by installing the cable-laying unit 1 on the ship 2, all of this equipment can be installed on the ship 2 at once, further improving workability.

[0044] Furthermore, in installation step S4, the cable-laying unit 1 is installed on deck D of the ship 2 moored in mooring step S1. By installing the cable-laying unit 1 on deck D of the ship 2 in this way, the work of installing the cable-laying unit 1 on the ship 2 can be facilitated, thereby further improving workability.

[0045] Furthermore, the ship 2 moored in mooring step S1 includes a first thruster 22a and a second thruster 22b. Then, in installation step S4, the cable-laying unit 1 is installed on deck D of the ship 2 moored in mooring step S1 so that it is positioned between the first thruster 22a and the second thruster 22b. This makes it possible, for example, to easily ensure installation space for the cable-laying unit 1 on the ship 2, thereby further improving workability.

[0046] The multiple devices packaged in the cable-laying unit 1 also include a tensioner 12 that applies tension to the cable C. This allows the tensioner 12 to be installed on the ship 2 by installing the cable-laying unit 1 on the ship 2. Furthermore, in installation step S4, the cable-laying unit 1 is installed on deck D of the ship 2 moored in mooring step S1 so that the tensioner 12 is positioned between the first thruster 22a and the second thruster 22b. This makes it easy to ensure installation space on the ship 2 for the cable-laying unit 1, including the tensioner 12, thereby further improving workability.

[0047] The multiple devices packaged in the cable-laying unit 1 also include a cable chute 11. This allows the cable chute 11 to be installed on the ship 2 by installing the cable-laying unit 1 on the ship 2. Furthermore, in installation step S4, the cable-laying unit 1 is installed on deck D of the ship 2 moored in mooring step S1 so that the cable chute 11 is positioned between the first thruster 22a and the second thruster 22b. This makes it easy to ensure installation space on the ship 2 for the cable-laying unit 1, including the cable chute 11, thereby further improving workability.

[0048] Furthermore, in installation step S4, the first thruster 22a and the second thruster 22b are installed together with the cable-laying unit 1 on the ship 2 moored in mooring step S1. This reduces the time required to install the first thruster 22a and the second thruster 22b on the ship 2, thereby further improving workability.

[0049] The method further includes a pulling-up step S7 and a splicing step S8. In the pulling-up step S7, the cable C laid on the seabed is pulled up to the surface. In the splicing step S8, the cable C pulled up to the surface in the pulling-up step S7 is spliced ​​with a new cable C. This makes it possible, for example, to pull a damaged cable C laid on the seabed up to the surface and splice it with a new cable C for repair. The cable-laying unit 1 also includes a splicing container 13 used for splicing in the splicing step S8. This allows, for example, the task of splicing the cable C that has been pulled up to the sea in the pulling-up step S7 with a new cable C to be carried out easily and reliably.

[0050] The method further includes a removal step S6. In removal step S6, the cable-laying unit 1 installed on the ship 2 in installation step S4 is removed from the ship 2. This allows the ship 2 to be reused for purposes other than laying the cable C. Furthermore, the removed cable-laying unit 1 can be installed on another ship 2, allowing the cable-laying unit 1 to be reused.

[0051] Furthermore, in the removal step S6, the first thruster 22a and the second thruster 22b may be removed from the ship 2 together with the cable-laying unit 1 that was installed on the ship 2 in the installation step S4. This makes it possible to reduce the time required to remove the first thruster 22a and the second thruster 22b from the ship 2, for example, thereby further improving workability.

[0052] The method further includes a preparation step S2. In the preparation step S2, the cable-laying unit 1 is prepared at the quay P. In this way, the cable-laying unit 1 can be prepared at the quay P in advance. Furthermore, the cable-laying unit 1 that is installed on the ship 2 in installation step S4 is the cable-laying unit 1 that is prepared on the quay P in preparation step S2. This allows, for example, the work of installing the cable-laying unit 1 on the ship 2 to be carried out quickly, thereby further improving workability.

[0053] The method also includes a moving step S3. In moving step S3, the cable-laying unit 1 prepared on the quay P in preparation step S2 is moved from the quay P onto the ship 2 by the crane 3. The cable-laying unit 1 that is installed on the ship 2 in installation step S4 is the cable-laying unit 1 that is moved in moving step S3. This allows the cable-laying unit 1 to be reliably installed on the ship 2, for example, even if the cable-laying unit 1 is relatively heavy. This further improves workability.

[0054] (Second embodiment) Next, an installation method of the second embodiment according to the present disclosure will be described with reference to FIG. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described. FIG. 6 is a diagram showing a flow of the installation method according to the second embodiment. The installation method of the second embodiment further includes a thruster installation step S10 in addition to the steps of the first embodiment.

[0055] The thruster installation step S10 is a step of installing the first thruster 22a and the second thruster 22b on the ship 2. The installation step S4 is performed, for example, before the thruster installation step S10 as shown in Fig. 6. Alternatively, the installation step S4 may be performed after the thruster installation step S10.

[0056] As explained above, the installation method according to the second embodiment further includes a thruster installation step S10. In thruster installation step S10, the first thruster 22a and the second thruster 22b are installed on the ship 2. Then, installation step S4 is carried out before thruster installation step S10. This makes it possible to prevent interference between the first thruster 22a and the second thruster 22b when installing the cable-laying unit 1 on the ship 2. This further improves workability.

[0057] Furthermore, the installation step S4 may be performed after the thruster installation step S10. This makes it possible to prevent the cable-laying unit 1 from interfering with the first thruster 22a and the second thruster 22b when installing them on the ship 2. This further improves workability.

[0058] (Third embodiment) Next, an installation method of the third embodiment according to the present disclosure will be described with reference to FIG. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described. FIG. 7 is a diagram showing a flow of an installation method according to the third embodiment. The installation method of the third embodiment further includes a thruster detaching step S11 in addition to the steps of the first embodiment.

[0059] The thruster detaching step S11 is a step of detaching the first thruster 22a and the second thruster 22b from the ship 2. The detaching step S6 is performed, for example, before the thruster detaching step S11 as shown in Fig. 7. Alternatively, without being limited thereto, the detaching step S6 may be performed after the thruster detaching step S11.

[0060] As explained above, the installation method according to the third embodiment further includes a thruster removing step S11 in addition to the removing step S6. In the thruster removing step S11, the first thruster 22a and the second thruster 22b may be removed from the ship 2. The removing step S6 may also be performed before the thruster removing step S11. This makes it possible to prevent the cable-laying unit 1 from interfering with the removal of the first thruster 22a and the second thruster 22b from the ship 2. This further improves workability.

[0061] Furthermore, the removal step S6 may be performed after the thruster removal step S11. This makes it possible to prevent interference between the first thruster 22a and the second thruster 22b when removing the cable-laying unit 1 from the ship 2. This further improves workability.

[0062] (Fourth embodiment) Next, an installation method of the fourth embodiment according to the present disclosure will be described with reference to FIG. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described. FIG. 8 is a perspective view showing a boat 2 according to the fourth embodiment. In the fourth embodiment, the ship 2 is provided with an anchoring facility 23 instead of the thruster 22 . The anchor equipment 23 is equipment for fixing the ship 2 on the sea and for moving the ship 2. The anchor equipment 23 is a rope-like member, one end of which is connected to a winch W installed on the ship 2, and the other end of which is connected to the seabed. In this way, the anchor equipment 23 fixes the ship 2 on the sea. The winch W is also used to move the ship 2. In the fourth embodiment, the anchoring equipment 23 is provided at each of the four corners of the main body 21. This is preferable so that the ship 2 can be more reliably fixed on the sea.

[0063] In the fourth embodiment, the anchor equipment 23 includes a first anchor equipment 23a and a second anchor equipment 23b. As described above, the first anchor equipment 23a is one of the anchor equipment 23 provided at the four corners of the ship 2. As described above, the second anchor equipment 23b is an anchor equipment 23 other than the first anchor equipment 23a among the anchor equipment 23 provided at the four corners of the ship 2. The first anchor equipment 23a and the second anchor equipment 23b have similar configurations. In other words, in the fourth embodiment, the first anchoring facility 23a is used instead of the first thruster 22a in the first embodiment, and the second anchoring facility 23b is used instead of the second thruster 22b. Furthermore, in the fourth embodiment, the first anchor equipment 23a may be detachable from the ship 2, and the second anchor equipment 23b may be detachable from the ship 2. Specifically, the first anchor equipment 23a and the second anchor equipment 23b may be attached to the ship 2 by, for example, welding or mechanical joining (i.e., "jointing that connects by mechanical action", such as bolting or twist locking), and thereby be detachable from the ship 2. This may enable, for example, the ship 2 to be used for a purpose different from that in the fourth embodiment. Furthermore, the anchor equipment 23 may be attached to the ship as appropriate instead of the thruster 22 in the first to third embodiments described above.

[0064] As explained above, according to the installation method of the fourth embodiment, the first anchoring arrangement 23a is used instead of the first thruster 22a, and the second anchoring arrangement 23b is used instead of the second thruster 22b. This makes it possible to fix the position of the ship 2 using, for example, the first anchoring arrangement 23a and the second anchoring arrangement 23b. This makes it easier to install or remove the cable-laying unit 1 from the ship 2, for example.

[0065] Furthermore, the first anchor facility 23a may be detachable from the ship 2, and the second anchor facility 23b may be detachable from the ship 2. This allows, for example, after the work of laying the cable C using the ship 2 is completed, to return the ship 2 to its original state by removing the first anchor facility 23a and the second anchor facility 23b from the ship 2.

[0066] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, in the mooring step S1, the ship 2 may be moored to a cargo ship carrying the cable-laying unit 1. This allows the installation of the cable-laying unit 1 on the ship 2 to be carried out at sea. Furthermore, both the thruster installation step S10 of the second embodiment and the thruster removal step S11 of the third embodiment may be added to each step of the first embodiment. Furthermore, the cable-laying unit 1 does not need to be a package of multiple devices used to lay the cable C. Moreover, instead of the thruster 22 and the anchor equipment 23, the ship 2 may be provided with any other equipment as appropriate. Furthermore, the thrusters 22 and anchoring equipment 23 do not have to be removable from the ship 2 . The cable-laying unit 1 may also be moved onto the ship 2 by equipment other than the crane 3. For example, the cable-laying unit 1 may be moved onto the ship 2 by a dolly or the like. Furthermore, the cable laying unit 1 does not necessarily have to include each of the multiple devices described above, and may also be provided with devices other than the multiple devices described above.

[0067] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0068] (Addendum) The installation method according to the embodiment can be understood, for example, as follows.

[0069] <1> An installation method according to one aspect of the present disclosure includes a mooring step of mooring a ship, and an installation step of installing and fixing a cable laying unit used for cable laying to the ship moored in the mooring step, wherein the cable laying unit is removable from the ship.

[0070] According to the above-described installation method, the mooring step involves mooring the ship. In the installation step, the cable laying unit used for cable laying is installed and fixed to the moored ship in the mooring step. This allows the work of installing the cable laying unit on the ship to be carried out while the ship is moored. This therefore allows the cable laying unit to be installed reliably on the ship, thereby improving workability. In the above method, the cable laying unit is detachable from the ship, which allows, for example, after a cable laying operation using the ship is completed, to remove the cable laying unit from the ship and reuse the ship for a purpose other than cable laying.

[0071] <2> the above <1> In the installation method according to the above, the cable-laying unit may be configured as a package containing a plurality of devices used for laying the cable.

[0072] The cable-laying unit also packages multiple pieces of equipment used in cable laying. This means that by installing the cable-laying unit on a ship, all of these pieces of equipment can be installed on the ship at once, further improving workability.

[0073] <3> the above <1> or <2> In the installation method according to the above, a configuration may be adopted in which the cable-laying unit is installed in the installing step on the deck of the ship moored in the mooring step.

[0074] Furthermore, in the installation step, the cable laying unit is installed on the deck of the ship to be moored in the mooring step. By installing the cable laying unit on the deck of the ship in this way, the work of installing the cable laying unit on the ship can be made easier, thereby further improving workability.

[0075] <4> the above <3> In the installation method according to the above, the ship moored in the mooring step may include a first thruster and a second thruster, and the cable-laying unit may be installed on the deck of the ship moored in the mooring step so as to be positioned between the first thruster and the second thruster in the installation step.

[0076] Furthermore, the ship moored in the mooring step includes a first thruster and a second thruster. Then, in the installation step, the cable-laying unit is installed on the deck of the ship moored in the mooring step so as to be positioned between the first thruster and the second thruster. This makes it possible, for example, to easily ensure installation space for the cable-laying unit on the ship, thereby further improving workability.

[0077] <5> the above <4> In the installation method according to the above, the plurality of devices may include a tensioner that applies tension to a cable, and the cable-laying unit may be installed on the deck of the ship moored in the mooring step so that the tensioner is positioned between the first thruster and the second thruster in the installation step.

[0078] The equipment packaged in the cable laying unit also includes a tensioner for tensioning the cable, which allows the tensioner to be installed on the ship when the cable laying unit is installed on the ship. Furthermore, in the installation step, the cable laying unit is installed on the deck of the ship to be moored in the mooring step so that the tensioner is positioned between the first thruster and the second thruster. This makes it easy to ensure installation space on the ship for the cable laying unit, including the tensioner, thereby further improving workability.

[0079] <6> the above <4> or <5> In the installation method according to the above, the plurality of devices may include a cable chute, and the cable-laying unit may be installed on the deck of the ship moored in the mooring step so that the cable chute is positioned between the first thruster and the second thruster in the installation step.

[0080] The multiple pieces of equipment packaged in the cable laying unit also include a cable chute, which allows the cable chute to be installed on the ship by installing the cable laying unit on the ship. Furthermore, in the installation step, the cable laying unit is installed on the deck of the ship to be moored in the mooring step so that the cable chute is positioned between the first thruster and the second thruster. This makes it easy to ensure installation space on the ship for the cable laying unit, including the cable chute, thereby further improving workability.

[0081] <7> the above <4> from <6> In the installation method according to any one of the above aspects, a configuration may be adopted in which, in the installation step, the first thruster and the second thruster are installed together with the cable laying unit on the ship to be moored in the mooring step.

[0082] Furthermore, in the installation step, the first thruster and the second thruster are installed together with the cable-laying unit on the ship to be moored in the mooring step. This reduces the time required to install the first thruster and the second thruster on the ship, thereby further improving workability.

[0083] <8> the above <4> from <7> In any one of the above-mentioned installation methods, the method may further include a thruster installation step of installing the first thruster and the second thruster on the ship, and the installation step may be performed before the thruster installation step.

[0084] The method further includes a thruster installation step. In the thruster installation step, the first thruster and the second thruster are installed on the ship. The installation step is performed before the thruster installation step. This makes it possible to prevent interference between the first thruster and the second thruster when installing the cable laying unit on the ship, thereby further improving workability.

[0085] <9> the above <4> from <8> In any one of the above-mentioned installation methods, the method may further include a thruster installation step of installing the first thruster and the second thruster on the ship, and the installation step may be performed after the thruster installation step.

[0086] The installation step may be performed after the thruster installation step, which can prevent the cable-laying unit from interfering with the first thruster and the second thruster when they are installed on the ship, thereby further improving workability.

[0087] <10> the above <1> from <9> In any one of the above-mentioned installation methods, the method may further include a lifting step of lifting up a cable laid on the seabed, and a joining step of joining the cable lifted in the lifting step with a new cable, and the plurality of devices may include a joining container used for joining in the joining step.

[0088] The method further includes a pulling-up step and a splicing step. In the pulling-up step, the cable laid on the seabed is pulled up. In the splicing step, the cable pulled up in the pulling-up step is spliced ​​with a new cable. This makes it possible, for example, to pull up a damaged cable laid on the seabed and splice it with a new cable to repair it. The cable laying unit also includes a splicing container used for splicing in the splicing step, which allows, for example, the operation of splicing the cable pulled up in the pulling up step with a new cable to be performed easily and reliably.

[0089] <11> the above <1> from <10> In the installation method according to any one of the above aspects, a configuration may be adopted which further comprises a removal step of removing the cable laying unit installed on the ship in the installation step from the ship.

[0090] The method further includes a removal step, in which the cable laying unit installed on the ship in the installation step is removed from the ship. This allows the ship to be reused for purposes other than cable laying. Furthermore, the removed cable laying unit can be installed on another ship, allowing the cable laying unit to be reused.

[0091] <12> the above <4> from <9> In any one of the above-mentioned installation methods, a configuration may be adopted that further comprises a removal step of removing the first thruster and the second thruster from the ship together with the cable laying unit installed on the ship in the installation step.

[0092] In the removing step, the first thruster and the second thruster may be removed from the ship together with the cable-laying unit installed on the ship in the installing step. This can, for example, shorten the time required to remove the first thruster and the second thruster from the ship, thereby further improving workability.

[0093] <13> the above <4> from <9> In any one of the above-mentioned installation methods, the installation method may further include a removal step of removing the cable laying unit installed on the ship in the installation step from the ship, and a thruster removal step of removing the first thruster and the second thruster from the ship, and the removal step may be performed before the thruster removal step.

[0094] Furthermore, in addition to the removing step, a thruster removing step may be further provided. In the thruster removing step, the first thruster and the second thruster may be removed from the ship. The removing step may be performed before the thruster removing step. This makes it possible to prevent interference with the cable laying unit when removing the first thruster and the second thruster from the ship. This further improves workability.

[0095] <14> the above <4> from <9> In any one of the above-mentioned installation methods, the installation method may further include a removal step of removing the cable laying unit installed on the ship in the installation step from the ship, and a thruster removal step of removing the first thruster and the second thruster from the ship, and the removal step may be performed after the thruster removal step.

[0096] The removing step may be performed after the thruster removing step, which can prevent interference between the first thruster and the second thruster when removing the cable laying unit from the ship, thereby further improving workability.

[0097] <15> the above <4> from <9> In the installation method according to any one of the above aspects, a configuration may be employed in which a first anchor facility is used instead of the first thruster, and a second anchor facility is used instead of the second thruster.

[0098] Alternatively, a first anchoring facility may be used instead of the first thruster, and a second anchoring facility may be used instead of the second thruster. This allows, for example, the position of the ship to be fixed using the first anchoring facility and the second anchoring facility. This makes it easier, for example, to install or remove the cable laying unit from the ship.

[0099] <16> the above <15> In the installation method according to the above, the first anchoring system may be detachable from the ship, and the second anchoring system may be detachable from the ship.

[0100] The first anchoring arrangement may be detachable from the ship, and the second anchoring arrangement may be detachable from the ship, so that, for example, after cable-laying work using the ship is completed, the first anchoring arrangement and the second anchoring arrangement can be removed from the ship to return the ship to its original state.

[0101] <17> the above <1> from <16> In any one of the above-mentioned installation methods, a configuration may be adopted in which the method further comprises a preparation step of preparing the cable-laying unit on a quay, and the cable-laying unit installed in the installation step is the cable-laying unit prepared on the quay in the preparation step.

[0102] The method further comprises a preparation step, in which the cable-laying unit is prepared at the quay, thereby allowing the cable-laying unit to be prepared at the quay in advance. Furthermore, the cable-laying unit that is installed on the ship in the installation step is the same cable-laying unit that is prepared on the quay in the preparation step. This allows, for example, the work of installing the cable-laying unit on the ship to be carried out quickly, thereby further improving workability.

[0103] <18> the above <17> The installation method according to the above may further include a moving step of moving the cable-laying unit prepared on the quay in the preparation step from the quay to the ship using a crane, and the cable-laying unit installed in the installation step may be the cable-laying unit moved in the moving step.

[0104] The method further includes a moving step. In the moving step, the cable-laying unit prepared at the quay in the preparation step is moved from the quay onto the ship by a crane. The cable-laying unit installed on the ship in the installation step is the cable-laying unit moved in the moving step. This makes it possible to reliably install the cable-laying unit on the ship, even if the cable-laying unit is relatively heavy, for example. This further improves workability. [Explanation of symbols]

[0105] 1 Cable Laying Unit 2 ships 3 Hoist 4 Hoist ship 11 Cable Shoot 11a 1st Cable Chute 11b 2nd Cable Chute 12 Tensioner 13 Bonded Container 14 Rotating table 15 Cable Quadrant 21 Main body 22 thrusters 22a First Thruster 22b Second thruster 23 Anchoring equipment 23a First anchor facility 23b Second anchor facility C Cable D Deck P quay S1 Mooring step S2 Preparation step S3 Movement Step S4 Installation Step S5 Laying Step S6 Removal Steps S7 Pull-up step S8 Bonding Step S9 Re-laying step S10 Thruster installation step S11 Thruster Removal Steps

Claims

1. a mooring step for mooring the ship; an installation step of installing and fixing a cable laying unit used for cable laying to the ship moored in the mooring step; a lifting step for lifting up the cable laid on the seabed; a joining step of joining the cable pulled up in the pulling up step and a new cable, the cable laying unit is detachable from the vessel; The cable laying unit is a package of multiple devices used for laying the cable, the plurality of devices includes a joining container used for joining in the joining step; The joining step joins the cable pulled up in the pulling step and the new cable inside the joining container. A method of operation characterized by:

2. In the installing step, the cable laying unit is installed on the deck of the ship to be moored in the mooring step.

2. The method according to claim 1 .

3. the ship moored in the mooring step includes a first thruster and a second thruster, In the installing step, the cable laying unit is installed on the deck of the ship to be moored in the mooring step so as to be located between the first thruster and the second thruster.

3. The method according to claim 2.

4. The plurality of devices include a tensioner that applies tension to the cable; In the installing step, the cable laying unit is installed on the deck of the ship to be moored in the mooring step so that the tensioner is located between the first thruster and the second thruster.

4. The method according to claim 3.

5. the plurality of devices includes a cable chute; In the installing step, the cable laying unit is installed on the deck of the ship to be moored in the mooring step so that the cable chute is located between the first thruster and the second thruster.

4. The method according to claim 3.

6. In the installing step, the first thruster and the second thruster are installed together with the cable laying unit on the ship to be moored in the mooring step.

4. The method according to claim 3.

7. a thruster installation step of installing the first thruster and the second thruster on the ship; Further provided with the installation step is performed before the thruster installation step.

4. The method according to claim 3.

8. a thruster installation step of installing the first thruster and the second thruster on the ship; Further provided with the step of installing is performed after the step of installing the thruster.

4. The method according to claim 3.

9. a removal step of removing the cable laying unit installed on the ship in the installation step from the ship; 9. The method according to claim 1, further comprising:

10. a removal step of removing the first thruster and the second thruster from the vessel together with the cable laying unit installed on the vessel in the installation step; 9. The method according to claim 3, further comprising:

11. a removal step of removing the cable laying unit installed on the ship in the installation step from the ship; a thruster removal step of removing the first thruster and the second thruster from the vessel; Further provided with the detaching step is performed before the thruster detaching step.

9. A method according to any one of claims 3 to 8.

12. a removal step of removing the cable laying unit installed on the ship in the installation step from the ship; a thruster removal step of removing the first thruster and the second thruster from the vessel; Further provided with the detaching step is performed after the thruster detaching step.

9. The method according to claim 3, wherein the step of:

13. a first anchoring facility is used instead of the first thruster; using a second anchoring facility instead of the second thruster; 9. A method according to any one of claims 3 to 8.

14. the first anchoring arrangement is removable from the vessel; the second anchoring arrangement is removable from the vessel; 14. The method of claim 13.

15. a preparing step of preparing the cable laying unit at a quay; Further provided with the cable-laying unit installed in the installation step is the cable-laying unit prepared on the quay in the preparation step; 9. A method according to any one of claims 1 to 8.

16. a moving step of moving the cable-laying unit prepared at the quay in the preparation step from the quay onto the ship by a crane; Further provided with the cable laying unit installed in the installing step is the cable laying unit moved in the moving step; 16. The method of claim 15.

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