JP6820698B2 - How to add mooring lines, how to moor floating structures and how to construct floating offshore wind turbines - Google Patents

Description

The present invention relates to a method of adding a mooring rope, a method of mooring a floating structure, and a method of constructing a floating offshore wind turbine power generation facility, and in particular, other than a mooring rope such as a chain whose one end is connected to an anchor on the bottom of the water. A method of adding a mooring rope by pulling up the end side to the water and adding another mooring rope, and by connecting the added mooring rope and the floating structure, the floating structure is moored in the water area. It relates to a method and a construction method of a floating offshore wind power generation facility in which a wind turbine is mounted on a floating structure.

Conventionally, a method of mooring a large floating structure floating on the ocean to an offshore sea area via a chain has been known (see, for example, Patent Document 1).

On the other hand, as another method of mooring a large floating structure in the offshore sea area, an anchor to which one end of the chain is connected is sunk in advance on the seabed, and the other end of the chain is pulled up to the sea to become a floating structure. There is a method of mooring floating structures by connecting them. A specific procedure of this mooring method will be described with reference to FIG.

As shown in FIG. 22 (1), first, the chain 1 and the anchor 2 having a length required for mooring are loaded on the workbench 3 and transported to the installation sea area. The chain 1 and the anchor 2 are connected in advance. Upon arriving at the installation sea area, as shown in FIG. 22 (2), the anchor 2 is lowered into the sea with a chain lifter or the like, and the anchor 2 and the chain 1 are temporarily placed on the seabed G. As shown in FIG. 22 (3), the terminal of the chain 1 is temporarily fixed to the mooring buoy 5 floating on the sea surface WL via the wire 4 or the like. In this way, as shown in FIG. 22 (4), a plurality of chains 1 are temporarily placed around the planned installation location of the floating structure 6. The plurality of chains 1 are arranged in a manner extending substantially radially around the floating structure 6 in a plan view.

Subsequently, as shown in FIG. 22 (5), the floating structure 6 anchored at the port is towed to the installation sea area, and each terminal of the pair of chains 1 facing each other is pulled up via a wire 4 or the like, and the floating body is pulled up. It is fixed to the structure 6. By performing this fixing work for each chain 1 temporarily placed, the floating structure 6 is catenary moored in the installation sea area.

Japanese Patent No. 5418939

By the way, when the design external force acting on the floating structure or the installation water depth is large, the required length of the chain becomes long, and the diameter becomes large and the weight increases. For example, in the case of a floating structure for a 2 MW class offshore wind power generation facility installed in a sea area with a water depth of about 100 m, the length of one chain is about 830 m, the diameter of the common link is about 130 mm, and the weight per m is 0.3 t. A huge chain of degrees is needed. In the case of such a huge chain, it may be difficult to load one chain on the workbench due to insufficient deck space area of the workbench, insufficient loading capacity, and the like.

In order to deal with such problems, there is a method of loading and transporting only chains of a length that can be loaded on a workbench, and then adding chains of the shortage to form a chain of the required length. Conceivable. In this case, it is required to add chains at an appropriate time in order to avoid lengthening the construction period.

The present invention has been made in view of the above, and provides a method of adding a mooring line, a method of mooring a floating structure, and a method of constructing a floating offshore wind power generation facility, which can improve the efficiency of mooring work. The purpose is.

In order to solve the above-mentioned problems and achieve the object, the method of adding a mooring line according to the present invention is a method of adding a mooring line used when mooring a floating structure in a water area, and can be loaded. The process of loading the first mooring line of length on the workbench and transporting it to the mooring water area, and lowering the first mooring line and the anchor connected to one end of the first mooring line from the workbench into the water and mooring The mooring line is formed by the process of temporarily placing it on the bottom of the water area and by pulling the other end of the first mooring line temporarily placed on the bottom of the water above the water and connecting this other end with one end of the second mooring line for replenishment. It is characterized by having a process of replenishment.

Further, another method for adding a mooring rope according to the present invention is characterized in that, in the above-described invention, the mooring rope is added during the work associated with the anchor holding force test or the tensile test.

Further, in the above-described invention, another method for adding mooring ropes according to the present invention is for adding to the other end of one of the first set of mooring ropes facing each other temporarily placed on the bottom of the water. While connecting one end of the second mooring line, the other end of this second mooring line and one end of another second mooring line are connected, and the anchor connected to one of the first mooring lines is subjected to a holding force test or a holding force test. A tensile test is performed, after which the other second mooring line is removed and the other end of the other first mooring line is connected to one end of the other second mooring line.

Further, the method for mooring a floating structure according to the present invention is a method for mooring a floating structure via a mooring rope added by the above-mentioned method for adding a mooring rope, and is added to the other end of the first mooring rope. After adding the mooring rope by connecting one end of the second mooring rope for use, the other end of the second mooring rope is connected to the floating structure.

Further, in the construction method of the floating offshore wind power generation facility according to the present invention, the floating offshore wind power generation facility in which the wind turbine is mounted on the floating structure is installed by using the above-mentioned mooring method of the floating structure. This is a method of installing and constructing a floating offshore wind turbine by towing the floating offshore wind turbine to the installed water area and then mooring the floating structure of the floating offshore wind turbine to the installed water area via a mooring line. It is characterized by installing and constructing a wind power generation facility.

According to the method of adding a mooring line according to the present invention, it is a method of adding a mooring line used when mooring a floating structure in a water area, and a first mooring line having a loadable length is attached to a workbench. The process of loading and transporting to the mooring water area, the process of lowering the first mooring line and the anchor connected to one end of the first mooring line from the workbench into the water, and temporarily placing it on the bottom of the mooring water area, and on the bottom of the water. Since the other end of the temporarily placed first mooring rope is pulled up above the water and the other end is connected to one end of the second mooring rope for replenishment to replenish the mooring rope, the efficiency of the mooring work is increased. It has the effect of being able to be transformed.

Further, according to the other mooring rope replenishment method according to the present invention, the mooring rope is replenished during the work associated with the anchor holding force test or the tensile test, so that duplication of work can be avoided and the mooring work can be performed. It has the effect of improving efficiency.

Further, according to the method of adding other mooring ropes according to the present invention, of the pair of first mooring ropes facing each other temporarily placed on the bottom of the water, the other end of one of the first mooring ropes and the second mooring for addition are made. While connecting one end of the rope, the other end of this second mooring rope and one end of another second mooring rope are connected, and a holding force test or a tensile test is performed on the anchor connected to one of the first mooring ropes. After that, the other second mooring line is removed to connect the other end of the other first mooring line to one end of the other second mooring line, so that a pair of opposing sets temporarily placed on the bottom of the water. Even if the length of the first mooring line is insufficient and it is difficult to pull it up on the workbench at the same time, the holding force test or the tensile test can be performed.

Further, according to the method for mooring a floating structure according to the present invention, the method for mooring a floating structure via a mooring rope added by the above-mentioned method for adding a mooring rope, which is the other end of the first mooring rope. After the mooring rope is added by connecting with one end of the second mooring rope for replenishment, the other end of the second mooring rope is connected to the floating structure, so that the floating body is connected via the mooring rope having the required length. It has the effect of being able to moor the structure efficiently.

Further, according to the construction method of the floating offshore wind power generation facility according to the present invention, the floating offshore wind power generation facility in which a wind turbine is mounted on the floating structure is used by using the above-mentioned mooring method of the floating structure. It is a method of installing and constructing in the installation water area. After towing the floating offshore wind power generation facility to the installation water area, the floating structure of the floating offshore wind power generation facility is moored in the installation water area via a mooring line. Since the offshore wind power generation facility is installed and constructed, the effect is that the floating offshore wind power generation facility can be installed and constructed efficiently.

FIG. 1 is a schematic perspective view showing an offshore wind turbine applied to an embodiment of a method of adding a mooring rope, a method of mooring a floating structure, and a method of constructing a floating offshore wind turbine according to the present invention. FIG. 2 is an image diagram of mooring / installation by a method of adding a mooring line, a method of mooring a floating structure, and a method of constructing a floating offshore wind power generation facility according to the present invention. FIG. 3 is a schematic side view of the crane vessel. FIG. 4 is a schematic top view of the crane vessel. FIG. 5 is an explanatory diagram of a method of adding mooring ropes according to the present invention, (1) showing a method of connecting a first mooring rope and a second mooring rope, and (2) showing a method of connecting the second mooring ropes. It is a figure. FIG. 6 is a diagram showing step S1 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 7 is a diagram showing step S2 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 8 is a diagram showing step S3 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 9 is a diagram showing step S4 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 10 is a diagram showing step S5 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 11 is a diagram showing step S6 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 12 is a diagram showing step S7 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 13 is a diagram showing step S8 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 14 is a diagram showing step S9 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 15 is a diagram showing step S10 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 16 is a diagram showing step S11 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 17 is a diagram showing step S12 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 18 is a diagram showing step S13 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 19 is a diagram showing step S14 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 20 is a diagram showing step S15 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 21 is a diagram showing step S16 of the embodiment of the method of adding a mooring line according to the present invention. FIG. 22 is a schematic process diagram showing an example of a conventional mooring method for a floating structure.

Hereinafter, embodiments of a method of adding a mooring line, a method of mooring a floating structure, and a method of constructing a floating offshore wind power generation facility according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

[Floating structure]
First, the basic configuration of the floating structure applied to the embodiment of the present invention will be described.

FIG. 1 shows an example of a floating structure applied to an embodiment of the present invention. As shown in this figure, the floating structure 10 is composed of an offshore wind turbine 12 equipped with a wind turbine B, and functions as a floating offshore wind power generation facility 100 that generates wind power offshore.

The hull of the offshore wind turbine vessel 12 is a semi-sub type (semi-submersible type) floating structure in which four columnar floating bodies 14A to 14D arranged at the apex and the center of an equilateral triangle are interconnected in a plan view. A tower T is erected on the columnar floating body 14D located at the center, and a wind turbine B is mounted on the upper end thereof.

The four columnar floating bodies 14A to 14D each consist of a columnar body having a vertical axis, a connecting member 16A connecting the upper parts, a connecting member 16B made of an oblique member connecting the upper part and the lower part, and a lower part. They are connected to each other by a connecting member 16C that connects the spaces.

Two chain stoppers 20, two guide sheaves 22, and two chain guides 24 are provided on the outside of the columnar floats 14A to 14C in order from the top, and a fair leader 26 as a guide is provided below the columnar floats 14A to 14C. Two are provided. A messenger rope 28 is inserted and arranged in the chain stopper 20, the guide sheave 22, the chain guide 24, and the fair leader 26.

The offshore wind power generation vessel 12 can be applied to, for example, a 2 MW class offshore wind turbine, and its approximate dimensions are, for example, a hull diameter of about 60 m, a hull height of about 30 m, and a height to the highest point of the wind turbine B. It can be configured as about 90 m. As a mooring chain when the mooring water depth is about 120 m, a huge chain having a length of about 830 m for one row, a diameter of a common link of about 130 mm, and a weight of about 0.3 tons per m is required.

FIG. 2 is a mooring state diagram of the offshore wind power generator 12 as the floating structure 10. The offshore wind power generator 12 will be catenary moored in the installation sea area via the chain 30 and the anchor 32 formed by the method of adding the mooring line according to the present invention described later.

[How to add mooring lines]
Next, a method of adding a mooring line according to the present invention will be described.

The method of replenishing the mooring line according to the present invention is a method of replenishing the chain 30 (mooring line) used when mooring the offshore wind power generator 12 as the above-mentioned floating structure 10 in the installed sea area (water area) before mooring. Is. The present invention comprises a process of loading a chain (first mooring line) having a loadable length on a workbench and transporting it to a moored water area, and a chain from the workbench and an anchor connected to one end of the chain. The process of lowering it into the sea and temporarily placing it on the seabed (water bottom) of the mooring water area, and pulling up the other end of the chain temporarily placed on the seabed to the sea surface (water) and adding it to the other end (second mooring line) ) Is connected to one end to add a chain.

By the way, as shown in FIG. 2, when the floating structure 10 is moored in the offshore sea area via the chain 30, a preliminary test (retention of the anchor 32) is performed to see if the mooring system satisfies a predetermined tension condition. Force test or tensile test) is required to be performed on-site. In the method of adding a mooring line according to the present embodiment, a chain is added during the work associated with this test to form a chain 30 having a required length. By utilizing the opportunity of the test in this way, duplication of work can be avoided and the efficiency of mooring work can be improved. The timing of replenishing the mooring rope according to the present invention is not limited to the work associated with the test, and for example, the chain may be replenished during the work of pulling the anchor 32 and scraping it into the seabed G.

3 and 4 are schematic views of the crane vessel used in the above test. The right side of the figure is the bow side, and the left side of the figure is the stern house side. As shown in these figures, a crane 36, a puller unit 38 (hydraulic jack), chain shooters 40A and 40B, chain stoppers 42A to 42C, winches 44A to 44F, and sheave 46 are mounted on the hoisting vessel 34. is there. The puller unit 38 can pull the chain with a force of about 600 tons.

FIG. 5 (1) is an explanatory diagram when connecting a chain (first mooring line) and a chain (second mooring line), and FIG. 5 (2) shows a case where chains (second mooring line) are connected to each other. It is explanatory drawing of. As shown in FIG. 5 (1), when the chain 30B (second mooring line) of length L2 is added to the chain 30A (first mooring line) of length L1, the end link 50A of the opposite terminal is added. , 50B may be connected to each other via a shackle with a nut (not shown). The chain 30B is composed of a main chain 54 (length L21) and a working chain 56 (length L22), and each chain can be connected by a Kenter shackle 52. The length of each chain can be configured as L1 = 660 m and L2 = 170 m (L21 = 100 m, L22 = 70 m), for example, when the required length L for one chain is about 830 m.

Further, at the time of temporary feeding in step S4 described later, it is necessary to connect the chains 30B to each other. In this case, as shown in FIG. 5 (2), the chains 30B may be connected to each other with a shackle 58. ..

Next, a specific procedure of the method of adding the mooring rope according to the present invention using the work associated with the tensile test (holding force test) will be described with reference to the process diagrams (steps S1 to S16) of FIGS. 6 to 21. To do. In each of the views of FIGS. 6 to 21, (1) is a plan view, (2) is a side sectional view, and (3) is a partially enlarged plan view of the crane vessel. The right side of the figure is the traction side in the tensile test, and the left side is the anti-traction side.

First, as shown in step S1 of FIG. 6, a crane vessel is placed in a moored water area at a predetermined water depth (for example, about 120 m) in which a chain 30A (first mooring line) having a length L1 and an anchor 32 are temporarily placed on the seabed G in advance. Place 34. Here, the crane vessel 34 is arranged so that the vertical axis Z1 representing the center position thereof coincides with the vertical axis Z representing the center position of the planned mooring portion of the floating structure 10. Further, the chain 30A is loaded and transported on a workbench (not shown), and the length L1 for one row is less than the length required for mooring. Further, in the present embodiment, the chain 30A and the anchor 32 are arranged substantially linearly at positions symmetrical with respect to the vertical axis Z at positions symmetrical with respect to each other, thereby forming a set of mooring systems.

Next, the crane vessel 34 is moored to the wire 60 which is preliminarily connected to the end of the chain 30A. In this case, the wire 60 on the tow side (right side) is engaged with the winch 44F via the chain shooter 40A, the puller unit 38, and the sheave 46 of the crane vessel 34. Further, the wire 60 on the anti-traction side (left side) is engaged with the winch 44C of the crane vessel 34.

As shown in step S2 of FIG. 7, the end of the chain 30A is pulled up via the wire 60 on the tow side, and the puller unit 38 holds the end of the chain 30A.

As shown in step S3 of FIG. 8, after pulling up the end of the chain 30A on the traction side, the end of the chain 30A is held by the chain stopper 42A of the crane vessel 34, and the end of the chain 30A is added to the end link 50A. The end link 50B of the chain 30B (second mooring line) of No. 1 is connected via a shackle with a nut (not shown). This connection method is as described with reference to FIG. 5 (1) above. The other end of the chain 30B is engaged with the winch 44E and the puller unit 38. By doing so, the chain 30B is added to the chain 30A. The total length L of the chain formed by this replenishment is equal to the sum of the length L1 of the chain 30A and the length L2 of the chain 30B, which is the length required for mooring. For example, when L = 830 m, L1 = 660 m and L2 = 170 m can be set.

As shown in step S4 of FIG. 9, the added chain composed of the chain 30A and the chain 30B is unwound, while the winch 44F pulls up the mooring chain 30A on the left side via the wire 60 on the opposite side.

As shown in step S5 of FIG. 10, the end of the mooring chain 30A on the non-traction side is fixed to the chain stopper 42C. On the other hand, a chain 30C (second mooring line) of the same length L2 is temporarily connected to the end of the chain 30B. After the tensile test on the tow side is completed, the chain 30C is disconnected from the chain 30B and added to the chain 30A on the non-tow side.

In this case, the end of the chain 30B is held by the chain stopper 42A, and the end link of the chain 30C is connected to the end link of this end via a shackle (not shown). This connection method is as described with reference to FIG. 5 (2) above. The other end of the chain 30C is engaged with the winch 44E and the puller unit 38. By doing so, the chain 30C is added to the chain 30B. The total length L of the chain formed by this replenishment is equal to the sum of the length L1 of the chain 30A, the length L2 of the chain 30B, and the length L2 of the chain 30C, and exceeds the length required for mooring.

As shown in step S6 of FIG. 11, with the chain 30A on the anti-traction side fixed, the chain 30A on the towing side is wound up by the puller unit 38 and pulled with a predetermined traction force to perform a tensile test. In this case, for example, when the maximum design tension of the anchor position is 500t, the traction force is set to 500t and held for a predetermined time (for example, 15 minutes), the presence or absence of force release and anchor movement is confirmed, and load data and the like are acquired. To do. After that, the traction force is gradually reduced to complete the tensile test.

As shown in step S7 of FIG. 12, the tow side chains 30A, 30B, and 30C are fed out by the puller unit 38, and the anti-tow side chains 30A are landed on the seabed G.

As shown in step S8 of FIG. 13, the chain 30A on the anti-traction side is unwound to land on the seabed G, and at the same time, the chains 30A, 30B, 30C on the towing side are wound up.

As shown in step S9 of FIG. 14, the wire 60 on the non-traction side is shifted to the winch 44C side, and the chains 30A, 30B, 30C on the towing side are wound up by a predetermined length (for example, about 50 m).

As shown in step S10 of FIG. 15, while holding the crane vessel 34 by the tugboat 62, the chain 30A on the towing side is folded back and laid. The chain 30C connected to the end of the chain 30B is disconnected and disconnected, and the wire 60 is connected instead.

As shown in step S11 of FIG. 16, the chain 30A on the towing side is landed on the seabed G while the crane vessel 34 is held by the tugboat 62.

As shown in step S12 of FIG. 17, the wires 60 on the tow side and the anti-tow side are shifted from each other to prepare for reversal of the crane vessel 34.

As shown in step S13 of FIG. 18, the direction of the crane vessel 34 is reversed by 180 degrees.

As shown in step S14 of FIG. 19, the chain 30A is wound up by the winch 44F via the wire 60 on the non-traction side.

As shown in step S15 of FIG. 20, after pulling up the end of the chain 30A on the non-traction side, the end of the chain 30A is held by the chain stopper 42A, and the chain 30C for addition to the end link 50A at this end is held. The end link 50C of (second mooring line) is connected via a shackle with a nut (not shown). This connection method is the same as in step S3 described above. As the chain 30C, the one temporarily used in step S5 or the like is reused. The other end of the chain 30C is engaged with the winch 44E and the puller unit 38. By doing so, the chain 30C is added to the chain 30A on the anti-traction side. The total length L of the chain formed by this replenishment is equal to the sum of the length L1 of the chain 30A and the length L2 of the chain 30C, which is the length required for mooring. For example, when L = 830 m, L1 = 660 m and L2 = 170 m can be set.

As shown in step S16 of FIG. 21, the replenished chain including the chain 30A and the chain 30C on the non-traction side is unwound.

According to the above steps S1 to S16, when the tensile test is completed, the chains having the length required for mooring can be temporarily placed on the seabed G as a pair on the left and right. As a result, in order to prepare for mooring, the floating structure 10 moored at the port is towed to the sea area in the same manner as in the prior art, and each of the pair of chains 30A, 30B, chains 30A, and 30C facing each other. The terminal may be pulled up via a wire or the like, fixed to the floating structure 10, and moored in a catenary.

As described above, in the present invention, by utilizing the work opportunity associated with the holding force test or the tensile test for the work of adding chains, duplication of work can be avoided and the efficiency of mooring work can be improved. In particular, the application of the present invention is effective when the chain required for mooring is too large to be loaded on the workbench, or when a workbench having the required loading capacity cannot be prepared.

Further, according to the above embodiment, the chains 30B and 30C are connected to the chain 30A on the tow side, a holding force test or a tensile test is performed on the anchor 32 on the tow side, and then the chain 30C is removed. Since the chain 30A and the chain 30C on the non-towing side are connected, even if the length of the pair of opposing chains 30A temporarily placed on the seabed G is insufficient and it is difficult to pull them up on the crane vessel 34 at the same time. A force test or a tensile test can be performed.

[Mooring method of floating structure]
Next, a method of mooring the floating structure according to the present invention will be described.

The mooring method of the floating structure according to the present invention is the method of adding the mooring line according to the present invention to the offshore wind power generator 12 as the floating structure 10 illustrated in FIG. 1 above, as shown in FIG. This is a method of mooring in a predetermined installation sea area such as offshore by a chain 30 added by the above.

First, a chain having a length required for mooring is formed by the above-mentioned method of adding mooring lines according to the present invention, and temporarily placed on the seabed G around the planned mooring location. In the case of the floating structure 10 illustrated in FIG. 1 above, the chain of 6 is temporarily placed. Next, in the same manner as in the prior art, the floating structure 10 anchored at the port is towed to the sea area, the terminal of the chain temporarily placed is pulled up via a wire or the like, and fixed to the floating structure 10. Moored at the catenary.

Here, as shown in FIGS. 2 and 1, by pulling up the messenger rope 28 by a crane vessel or the like (not shown), the temporarily placed chain 30 is introduced into the fair leader 26 or the like of the floating structure 10, and the chain stopper is used. Lock to 20. This work is performed on the six chains and the columnar floating bodies 14A to C, and finally, as shown in FIG. 2, the chains 30 are locked to all six chain stoppers 20. According to this method, the floating structure can be moored efficiently even with a huge chain that cannot be loaded and transported by a workbench.

[Construction method of floating offshore wind power generation facility]
Next, a construction method of a floating offshore wind power generation facility according to the present invention will be described.

This construction method uses the above-mentioned mooring method of the floating structure, and as shown in FIGS. 1 and 2, the floating body is composed of an offshore wind turbine 12 having a wind turbine B mounted on the floating structure 10. This is a method of installing and constructing the offshore wind power generation facility 100 in the installation water area.

As a specific procedure of this method, first, the chain is added by the method of adding the mooring line of the present invention described above, and the chain is temporarily placed on the seabed G. Subsequently, the offshore wind power generation vessel 12 is towed to the installation water area. Next, using the method of mooring the floating structure of the present invention described above, as shown in FIG. 2, the offshore wind turbine 12 is moored in the installation water area via a chain, and the floating offshore wind turbine 100 is installed. Install and install in water area. According to this method, the floating offshore wind power generation facility 100 can be installed and constructed efficiently even with a huge chain that cannot be loaded and transported by a workbench.

As described above, according to the method of adding a mooring line according to the present invention, it is a method of adding a mooring line used when mooring a floating structure in a water area, and the first mooring is of a loadable length. The process of loading the rope on the workbench and transporting it to the mooring water area, and lowering the first mooring rope and the anchor connected to one end of the first mooring rope from the workbench into the water and temporarily placing it on the bottom of the mooring water area. The process includes a step of pulling the other end of the first mooring rope temporarily placed on the bottom of the water onto the water and connecting the other end with one end of the second mooring rope for replenishment to replenish the mooring rope. Therefore, the efficiency of mooring work can be improved.

Further, according to the other mooring rope replenishment method according to the present invention, the mooring rope is replenished during the work associated with the anchor holding force test or the tensile test, so that duplication of work can be avoided and the mooring work can be performed. Efficiency can be improved.

Further, according to the method of adding other mooring ropes according to the present invention, of the pair of first mooring ropes facing each other temporarily placed on the bottom of the water, the other end of one of the first mooring ropes and the second mooring for addition are made. While connecting one end of the rope, the other end of this second mooring rope and one end of another second mooring rope are connected, and a holding force test or a tensile test is performed on the anchor connected to one of the first mooring ropes. After that, the other second mooring line is removed to connect the other end of the other first mooring line to one end of the other second mooring line, so that a pair of opposing sets temporarily placed on the bottom of the water. Even if the length of the first mooring line is not enough and it is difficult to pull it up on the workbench at the same time, the holding force test or the tensile test can be performed.

Further, according to the method for mooring a floating structure according to the present invention, the method for mooring a floating structure via a mooring rope added by the above-mentioned method for adding a mooring rope, which is the other end of the first mooring rope. After the mooring rope is added by connecting with one end of the second mooring rope for replenishment, the other end of the second mooring rope is connected to the floating structure, so that the floating body is connected via the mooring rope having the required length. The structure can be moored efficiently.

Further, according to the construction method of the floating offshore wind power generation facility according to the present invention, the floating offshore wind power generation facility in which a wind turbine is mounted on the floating structure is used by using the above-mentioned mooring method of the floating structure. It is a method of installing and constructing in the installation water area. After towing the floating offshore wind power generation facility to the installation water area, the floating structure of the floating offshore wind power generation facility is moored in the installation water area via a mooring line. Since the offshore wind power generation facility is installed and constructed, the floating offshore wind power generation facility can be installed and constructed efficiently.

As described above, the method of adding a mooring line, the method of mooring a floating structure, and the method of constructing a floating offshore wind power generation facility according to the present invention include mooring lines such as chains having one end connected to an anchor on the bottom of the water. It is useful for pulling up the end side to the water and adding another mooring line. In particular, due to insufficient deck space area of the workbench and insufficient loading capacity, one chain is loaded on the workbench. It is suitable for improving the efficiency of mooring work when it is difficult to do so.

1 Chain 2 Anchor 3 Workbench 4 Wire 5 Mooring buoy 6,10 Floating structure 12 Offshore wind turbine 14A-14D Columnar floating 16A-16C Connecting member 20 Chain stopper 22 Guide sheave 24 Chain guide 26 Fair leader 28 Messenger rope 30 Chain (mooring rope)
30A chain (first mooring line)
30B chain (second mooring line)
30C chain (another second mooring line)
32 Anchor 34 Hoisting vessel 36 Crane 38 Puller unit 40A, 40B Chain shooter 42A-42C Chain stopper 44A-44F Winch 46 Sheave 50A, 50B End link 52 Kenter shackle 54 Main chain 56 Working chain 58 Shackle 60 Wire 62 Tugboat 100 Floating offshore wind power generation facility B Wind turbine T tower Z, Z1 Vertical axis G Submarine (water bottom)
WL sea level

Claims (5)

A method of adding a mooring line used when mooring a floating structure in a body of water.
The process of loading the first mooring line of a loadable length on a workbench and transporting it to the moored water area,
The process of lowering the first mooring line and the anchor connected to one end of the first mooring line from the workbench into the water and temporarily placing them on the bottom of the moored water area.
The other end of the first mooring was temporarily placed underwater by pulling the water, possess a step of annex mooring lines by connecting the one end of the second mooring for the other end and replenishment,
Of a set of opposing first mooring lines temporarily placed on the bottom of the water, the other end of one of the first mooring lines and one end of the second mooring line for replenishment are connected, and the other end of the second mooring line And one end of another second mooring rope are connected, and an anchor connected to one first mooring rope is subjected to a holding force test or a tensile test, and then the other second mooring rope is removed and the other is removed. shirttail method of mooring lines, characterized that you connected the one end of the further second mooring to the other end of the first mooring. The method for adding a mooring rope according to claim 1, wherein the mooring rope is added during the work associated with the anchor holding force test or the tensile test. A method of mooring a floating structure through a mooring line added by the method of adding a mooring line according to claim 1 or 2 .
A floating body characterized in that the other end of the second mooring rope is connected to a floating structure after the other end of the first mooring rope is connected to one end of the second mooring rope for addition. How to moor a structure. The process of loading the first mooring line of a loadable length on a workbench and transporting it to the moored water area,
The process of lowering the first mooring line and the anchor connected to one end of the first mooring line from the workbench into the water and temporarily placing them on the bottom of the moored water area.
Replenishment of a mooring rope having a step of pulling the other end of the first mooring rope temporarily placed on the bottom of the water onto the water and connecting the other end to one end of the second mooring rope for replenishment to replenish the mooring rope. It is a method of mooring a floating structure via a mooring line added by the method.
A floating body characterized in that the other end of the second mooring rope is connected to a floating structure after the other end of the first mooring rope is connected to one end of the second mooring rope for addition. How to moor a structure. A method of installing and constructing a floating offshore wind power generation facility in which a wind turbine is mounted on a floating structure in the installation water area by using the method of mooring the floating structure according to claim 3 or 4 .
After towing the floating offshore wind power generation facility to the installation water area, the floating offshore wind power generation facility will be installed and constructed by mooring the floating structure of the floating offshore wind power generation facility in the installation water area via a mooring line. A characteristic method of constructing a floating offshore wind turbine.

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