JP6820697B2 - Mooring method of floating structure and construction method of floating offshore wind power generation facility - Google Patents

Description

The present invention relates to a method for mooring a floating structure and a method for constructing a floating offshore wind turbine, and in particular, the other end of a mooring chain whose one end is connected to a mooring anchor on the bottom of the water is pulled up onto the water to form a floating body. The present invention relates to a method of mooring a floating structure in which the floating structure is moored in a water area by connecting to the structure, and a method of constructing a floating offshore wind power generation facility in which a wind turbine is mounted on the floating structure.

Conventionally, a method of mooring a large floating structure floating on the ocean to an offshore sea area via a mooring 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, a mooring anchor to which one end of the mooring chain is connected is sunk in advance on the seabed, and the other end of the mooring chain is pulled up to the sea to float. There is a method of mooring a floating structure by connecting it to the structure. The specific procedure of this mooring method will be described with reference to FIG.

As shown in FIG. 10 (1), first, the floating structure 1 is towed by the tugboat 2 to the local sea area. Here, an anchor 3a is sunk in advance on the seabed G in the local sea area, and a hawser rope 3b is connected to the anchor 3a. The end of the hawser rope 3b is connected to the mooring buoy 3c on the sea level WL.

Subsequently, as shown in FIG. 10 (2), the floating structure 1 is connected to the hawser rope 3b and temporarily moored. By doing so, it is possible to prevent the floating structure 1 from drifting due to waves or the like during the subsequent main mooring work. Here, the anchor 4a and the mooring chain 4b are temporarily placed on the seabed G in the local sea area in advance. The end of the mooring chain 4b is connected to the mooring buoy 4d on the sea level WL via a rope 4c.

As shown in FIG. 10 (3), the crane vessel 5 is arranged in the sea area. Then, as shown in FIG. 10 (4), the end of the mooring chain 4b temporarily placed on the seabed G is lifted over the sea by the crane of the hoisting vessel 5 via the rope 4c.

Here, a fair leader 6 formed of a passage for guiding the movement of the mooring chain 4b is provided at the lower end of the floating structure 1 on the side, and a guide sheave 7 and a chain stopper 8 are provided at the upper end on the side. ing. As the chain stopper 8, for example, the double chain control device described in Patent Document 2 or the like is used.

As shown in FIG. 10 (5), the end of the mooring chain 4b lifted by the crane vessel 5 is anchored to the floating structure 1 by engaging with the chain stopper 8 through the fair leader 6 and the guide sheave 7. Finally, the length and tension of the mooring chain 4b are adjusted to moor the floating structure 1 in the local sea area.

Japanese Patent No. 5418939 Japanese Unexamined Patent Publication No. 9-277981

By the way, in the crane work in the open ocean, it is difficult to secure safety and construction accuracy depending on the amount of shaking of the hoisting vessel 5 due to the waves, and there are many cases where the work must be stopped. For example, in the case of a swelling wave with a long cycle, the swing width of the hanging hook or suspended load may reach several tens of meters even if the wave height is 1 meter or less, which may affect the operating rate of work. ..

On the other hand, since the floating structure 1 being temporarily moored is also in a state of being constantly shaken by the waves, the end of the mooring chain 4b, which is a heavy object lifted by the crane vessel 5, is set to the fair leader 6 of the floating structure 1 and the guide sheave. The work of engaging the chain stopper 8 after inserting it into the chain stopper 8 becomes very difficult. Therefore, there has been a demand for a mooring technique capable of easily anchoring the suspended mooring chain 4b to the floating structure 1.

The present invention has been made in view of the above, and provides a method for mooring a floating structure and a method for constructing a floating offshore wind power generation facility, which can easily connect the suspended mooring chain to the floating structure. The purpose is.

In order to solve the above-mentioned problems and achieve the object, the method of mooring a floating structure according to the present invention locks a guide including a passage for guiding the movement of the mooring chain and the mooring chain passed through the guide. This floating structure is provided by pulling the other end of the mooring chain, one end of which is connected to the mooring anchor on the bottom of the water, onto the water and connecting it to the chain stopper through a guide. Is a method of mooring in a water area, one end of which is locked to a chain stopper and the other end of which is connected to the other end of the messenger rope passed through a guide and the other end of the mooring chain pulled up above the water. After that, the mooring chain is introduced into the guide by pulling up the messenger rope, and the other end side of the mooring chain is locked to the chain stopper.

Further, another method of mooring a floating structure according to the present invention is characterized in that, in the above-described invention, the messenger rope is configured to include a rope portion and a chain portion that can be locked to a chain stopper.

Further, in the method of mooring another floating structure according to the present invention, in the above-described invention, after the pulled-up messenger rope or mooring chain is locked to the chain stopper, the side opposite to the side where the guide of the chain stopper is located is used. It is characterized by cutting and removing a messenger rope or mooring chain, then releasing the lock on the chain stopper, pulling up the messenger rope or mooring chain, and locking the pulled up messenger rope or mooring chain to the chain stopper. ..

Further, another method of mooring a floating structure according to the present invention is characterized in that, in the above-described invention, the surface of the messenger rope is made of a material that does not damage 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 chain. It is characterized by installing and constructing a wind power generation facility.

According to the method for mooring a floating structure according to the present invention, the floating structure includes a guide including a passage for guiding the movement of the mooring chain and a chain stopper for locking the mooring chain passed through the guide. On the other hand, this floating structure is moored in the water area by pulling up the other end side of the mooring chain whose one end side is connected to the mooring anchor on the bottom of the water and connecting it to the chain stopper through a guide. Guide the mooring chain by pulling up the messenger rope after connecting the other end side of the messenger rope that is locked to the chain stopper and the other end side is passed through the guide to the other end side of the mooring chain pulled up on the water. Since the other end of the mooring chain is locked to the chain stopper, the suspended mooring chain can be easily introduced into the guide by pulling up the messenger rope with a hoisting machine ship or the like, and the mooring chain is engaged with the chain stopper. Can be stopped. Therefore, the effect is that the suspended mooring chain can be easily tied to the floating structure.

Further, according to the method of mooring another floating structure according to the present invention, the messenger rope is configured to include a rope portion and a chain portion that can be locked to the chain stopper. Therefore, the messenger rope is pulled up and the chain is in the middle of being pulled up. It has the effect of being able to be locked to the stopper.

Further, according to the method of mooring another floating structure according to the present invention, the pulled-up messenger rope or mooring chain is locked to the chain stopper, and then the messenger rope on the side opposite to the side where the guide of the chain stopper is located. Alternatively, the mooring chain is cut and removed, then the lock on the chain stopper is released to pull up the messenger rope or mooring chain, and the pulled up messenger rope or mooring chain is locked to the chain stopper, so that the messenger rope or mooring chain It has the effect that the length can be adjusted shorter.

Further, according to another method for mooring a floating structure according to the present invention, the surface of the messenger rope is made of a material that does not damage the floating structure. Therefore, for example, the floating body is in a state where the messenger rope is inserted into a guide or the like. When towing a structure, it is possible to prevent scratches and the like from being scratched on the surface of the floating structure due to contact with the messenger rope.

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. This 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 chain. Since the offshore wind power generation facility is installed and constructed, the effect is that the floating offshore wind power generation facility can be easily installed and constructed.

FIG. 1 is a schematic perspective view showing an offshore wind turbine applied to an embodiment of 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 a schematic partially enlarged view of the outer columnar floating body. FIG. 3 is a schematic perspective view showing a configuration example of the chain stopper. FIG. 4 is a diagram showing step 1 of an embodiment of 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. 5 is a diagram showing step 2 of an embodiment of 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. 6 is a diagram showing step 3 of the embodiment of the method of mooring a floating structure and the method of constructing a floating offshore wind power generation facility according to the present invention. FIG. 7 is a diagram showing step 4 of an embodiment of 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. 8 is a diagram showing step 5 of an embodiment of 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. 9 is a diagram illustrating a cutting state of the mooring chain. FIG. 10 is a schematic process diagram showing an example of a conventional mooring method for a floating structure.

Hereinafter, embodiments of a method for mooring a floating structure and a method for constructing a floating offshore wind turbine 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.

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.

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 messenger rope 28 includes a rope portion 28A and a chain portion 28B that can be locked to the chain stopper 20. The rope portion 28A and the chain portion 28B are alternately arranged in a predetermined length in the extending direction of the messenger rope 28. By doing so, the messenger rope 28 can be locked to the chain stopper 20 via the chain portion 28B during the pulling work of the messenger rope 28 described later. It is desirable that the chain portion 28B is composed of a chain ring having at least three strings, and the chain ring used is preferably the same as the chain ring of the main mooring chain.

Here, the surface of the messenger rope 28 may be made of a material that does not damage the offshore wind power generator 12. In this case, for example, the surface of the messenger rope 28 may be coated with a resin that does not damage the contact object, or the messenger rope 28 itself is made of a resin that has sufficient strength and does not damage the contact object. You may. In this way, for example, when towing the offshore wind power generation ship 12 with the messenger rope 28 inserted through the fair leader 26 or the like, the contact of the messenger rope 28 causes scratches or the like on the surface of the offshore wind power generation ship 12. It can be prevented from sticking.

The messenger rope 28 may be inserted into the chain stopper 20, the guide sheave 22, the chain guide 24, and the fair leader 26 in the port in advance before the offshore wind power generator 12 is towed into the sea area. Further, in the port, only one end side of the messenger rope 28 is locked to the chain stopper 20, and the other end side is placed on the upper end surface 36 of the columnar floating bodies 14A to 14C and towed to the installation sea area. The other end side may be inserted and arranged in the guide sheave 22, the chain guide 24, and the fair leader 26. In this way, it is possible to smoothly shift to the work of pulling up the mooring chain later.

The fair leader 26 is for guiding the mooring chain in an arbitrary direction, and is provided on the outer peripheral surface of the lower portion of the columnar floating bodies 14A to 14C. The fair leader 26 is provided at symmetrical positions on both the left and right sides of the columnar floating body 14D located at the center of the equilateral triangle in a plan view with a slight interval.

As shown in FIG. 2, the fair leader 26 has a substantially U-shaped cross-section base 30 fixed so as to be rotatable around a shaft portion Z1 extending in a substantially vertical direction, and substantially at the tip of the base 30 on the opening side. A sheave portion 32 rotatably fixed around a shaft portion Z2 extending in the horizontal direction is provided. The mooring chain is inserted into a tubular passage 34 formed between the shaft portion Z1 side of the base portion 30 and the sheave portion 32. The fair leader 26 can regulate the position of the mooring chain by turning the base 30 and guide the movement of the mooring chain by rotating the sheave portion 32. In the example of FIG. 2, a messenger rope 28 is inserted through the fair leader 26 instead of the mooring chain.

The chain guide 24 is composed of a square tubular passage for guiding the mooring chain, and is provided on the outer peripheral surface of the upper end of the columnar floating bodies 22A to 22C. The guide sheave 22 is a sheave for guiding the mooring chain, and is provided on the upper end edge of the columnar floating bodies 22A to 22C above the chain guide 24. The chain stopper 20 is for connecting the mooring chain to the upper end surface 36 of the columnar floating bodies 22A to 22C, and is provided on the upper end surface 36 on the back side of the guide sheave 22. In the example of FIG. 2, a messenger rope 28 is inserted or locked in the chain guide 24, the guide sheave 22, and the chain stopper 20 instead of the mooring chain. The fair leader 26, the chain guide 24, the guide sheave 22, and the chain stopper 20 are arranged in a substantially straight line extending vertically.

The chain stopper 20 is composed of a chain stopper having a strength corresponding to the tensile force expected in the mooring chain. As the chain control device, for example, a well-known tongue type chain control device specified in JIS, a kanuki type chain control device, a double chain control device described in Patent Document 2 described above, and the like can be used. In this embodiment, a case where the chain stopper 20 is composed of a double chain control device will be described as an example.

As shown in FIG. 3, the chain stopper 20 is provided with two locking tools at opposite positions sandwiching the mooring chain C passing through the guide groove 38, and holds both shoulders of the chain ring 40 lying horizontally to stop it. is there. Here, it is assumed that a mooring anchor (not shown) is connected to the left end side of the mooring chain C. Two fixing locking tools 42 are symmetrically welded to both sides of the guide groove 38 through which the mooring chain C passes so as to be inclined inward in a V shape. Rotating locking tools 44 are installed inside the fixed locking tools 42, respectively. A hydraulic actuator 46 is attached to the rotation locking tool 44, and can be rotated manually or automatically.

If the rotary locking tool 44 is rotated outward to avoid it, the mooring chain C can slide along the guide groove 38. On the other hand, the rotary locking tool 44 is rotated inward, and the inner end surface of the rotary locking tool 44 comes into contact with the shoulder of the chain ring 40 lying down on the mooring chain C, and the outer end face is the end face of the fixed locking tool 42. The tensile force acting on the mooring chain C can be stopped by the fixing locking tool 42 and gripped. When the mooring chain C is pulled up to the right in the figure, the chain stopper 20 allows the mooring chain C to slide, but conversely, when the pulling tension of the mooring chain C is released, the rotary locking tool 44 causes the chainring. The mooring chain C is locked in contact with the shoulder of 40 so as not to allow sliding. As described above, the movement of the mooring chain C in the chain stopper 20 is one-way.

[Mooring method of floating structure]
Next, the mooring method of the floating structure according to the present invention will be described with reference to FIGS. 4 to 9.

In the method of mooring a floating structure according to the present invention, the offshore wind turbine 12 as the floating structure 10 illustrated in FIG. 1 above is moored in a predetermined installation sea area (water area) such as offshore via a mooring chain. The method. Finally, the offshore wind turbine 12 will be moored by anchoring it to a total of six chain stoppers 20 of the columnar floating bodies 14A to 14C. However, in the following explanation, the offshore wind turbine 12 is installed in the sea area. The procedure of mooring the columnar floating body 14A by anchoring it to one chain stopper 20 after towing the columnar floating body 14A will be described as an example.

First, as shown in step 1 of FIG. 4, the offshore wind power generator 12 is towed by the tugboat 2 to the installation sea area (step S1). Here, as described above, the messenger rope 28 is inserted and arranged in advance in each of the columnar floating bodies 14A to 14C of the offshore wind power generation ship 12. One end of the messenger rope 28 is locked to the chain stopper 20 on the upper end surface of each of the columnar floating bodies 14A to 14C, and the guide sheave 22, the chain guide 24, and the fair leader 26 are passed through in this order, and then the other end is each columnar. It is temporarily fixed to the upper end surfaces of the floating bodies 14A to 14C.

The messenger rope 28 may be arranged by the method described above instead of such temporary fixing. That is, in the port before towing, only one end side of the messenger rope 28 is previously locked to the chain stopper 20 on the upper end surface of each columnar floating body 14A to 14C, and the other end side is placed on the upper end surface, and the installation sea area. The other end may be inserted into the guide sheave 22, the chain guide 24, and the fair leader 26 after arriving at.

On the other hand, a mooring anchor 48 is sunk in advance on the seabed G (water bottom) of the local sea area, and one end side of the mooring chain 50 temporarily placed on the seabed G is connected to the mooring anchor 48. One end side of the hawser rope 52 having sufficient strength is connected to the other end side of the mooring chain 50, and the other end side is connected to the mooring buoy 54 floating on the sea surface WL.

Subsequently, the other end side of the hawser rope 52 is connected to the columnar floating body 14C to temporarily moor the offshore wind power generator 12 (step S2). By doing so, it is possible to prevent the offshore wind power generation vessel 20 from drifting due to waves or the like during the main mooring work for the columnar floating body 22A later. Here, it is preferable that the hawser rope 52 is locked to the chain stopper 20 on the upper end surface 36 by sequentially passing the chain guide 24 and the guide sheave 22 from the fair leader 26 at the lower part of the columnar floating body 14C, but this is not always the case. .. It should be noted that this work can be carried out by, for example, an insertion work by a diving worker, a lifting work of a crane of a hoisting vessel (not shown), or the like.

Next, as shown in step 2 of FIG. 5, the crane vessel 5 is arranged in the sea area, the hawser rope 52 on the columnar floating body 14A side is lifted by the crane of the crane vessel 5, and the mooring chain temporarily placed on the seabed G. The end portion 50a (the other end side) of the 50 is pulled up to the sea (water) (step S3). Subsequently, the end 50a of the mooring chain 50 pulled up to the sea and the end 28a (the other end side) of the messenger rope 28 are connected (step S4). This work can be carried out, for example, on a workbench (not shown).

Next, as shown in step 3 of FIG. 6, the messenger rope 28 is pulled up while the mooring chain 50 is suspended by the crane of the hoisting vessel 5 (step S5). By this pulling, the end portion 50a of the mooring chain 50 is guided into the fair leader 26 below the columnar floating body 14A. The pulling operation of the messenger rope 28 can be carried out by using, for example, a crane of a hoisting vessel (not shown) or a windlass (not shown) on the upper end surface of the columnar floating body 14A.

Here, when the messenger rope 28 is pulled up by using the crane of the hoisting machine ship, the following procedure can be performed in consideration of the limit of the pulling height of the crane. For example, when the limit value of the lifting height (lift) of the crane is 20 m, the messenger rope 28 is pulled up by this limit value and temporarily locked to the chain stopper 20 at the chain portion 28B (see FIG. 2). To do. As shown in FIG. 2, the messenger rope 28 includes a rope portion 28A and a chain portion 28B that can be locked to the chain stopper 20. Therefore, the messenger rope 28 is pulled up during the pulling operation of the chain stopper 20. Can be locked to.

After that, the work of changing the suspended portion of the crane and raising the limit value of the messenger rope 28 is repeated. In this way, even if the pull-up extension exceeds the limit value of the pull-up height of the crane, the pull-up work can be smoothly carried out. In the above case, it is desirable that the length of the section of the chain portion 28B of the messenger rope 28 is about the same as the limit value of the pulling height of the crane.

Next, as shown in step 4 of FIG. 7, by further pulling up the messenger rope 28, the end portion 50a of the mooring chain 50 is passed through the fair leader 26, the chain guide 24, and the guide sheave 22 in this order, and the chain stopper on the upper end surface. Pass through 20 (step S6). Then, the end portion 50a of the mooring chain 50 is sufficiently protruded from the guide groove 38 (see FIG. 3), and the mooring chain 50 is locked to the chain stopper 20 in this state. The temporary mooring hawser rope 52 connected to the columnar floating body 14C may be removed at a predetermined timing thereafter.

As described above, according to the method of mooring the floating structure according to the present embodiment, the lifted mooring chain 50 is constantly shaken by the waves by pulling up the messenger rope 28 by a crane vessel or the like. It can be easily guided to a guide such as the fair leader 26 of 12 (floating structure 10) and can be locked to the chain stopper 20. Therefore, the suspended mooring chain 50 can be easily tied to the offshore wind power generator 12 under the wave action.

The above procedure (steps 1 to 4) is also performed for the other columnar floating bodies 14B and 14C, and finally, as shown in step 5 of FIG. 8, the mooring chain 50 is locked to all six chain stoppers 20. To do. It is desirable to carry out this implementation order in consideration of the sway balance of the floating structure. For example, after locking the mooring chain 50 with respect to the chain stopper 20 on the right side of the columnar floating body 14A, the columnar floating body 14B It is conceivable that the mooring chain 50 is locked to the right chain stopper 20 and then the mooring chain 50 is locked to the right chain stopper 20 of the columnar floating body 14C.

After locking the six mooring chains 50 to all six chain stoppers 20, the work of evenly adjusting the tension of each mooring chain 50 to a predetermined size is performed. In this case, for example, as shown in FIG. 9, the mooring chain 50 is cut at a position X slightly beyond the chain stopper 20 (the side opposite to the side where the fair leader 26 as a guide is located) to remove the end portion thereof. The tension is adjusted by shortening the length of the mooring chain 50. This cutting operation can also be performed during the pulling operation of the messenger rope 28 or the mooring chain 50 in the above steps 3 and 4.

For example, in step 3 above, when the messenger rope 28 is pulled up by the crane of the hoisting machine ship, the messenger rope 28 is pulled up by a predetermined length and temporarily locked to the chain stopper 20 by the chain portion 28B, and then the chain stopper 20 is moved. The messenger rope 28 may be cut at a position X slightly beyond to remove the end thereof to shorten the length, and then the messenger rope 28 may be released from the chain stopper 20 and the pulling of the messenger rope 28 may be resumed. ..

Similarly, in step 4 above, the mooring chain 50 is cut at a position X slightly beyond the chain stopper 20 to shorten its length, and then the lock on the chain stopper 20 is released to release the mooring chain 50. The pulling may be resumed.

[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.

In this construction method, a floating offshore wind power generation facility composed of an offshore wind power generator 12 having a wind turbine B mounted on the floating structure 10 is installed in the installation water area by using the above-mentioned mooring method of the floating structure. It is a method of construction.

As a specific procedure of this method, first, the offshore wind power generation vessel 12 is towed to the installation water area as in the above step 1 (FIG. 4). Next, the offshore wind power generator 12 is moored in the installation water area via the mooring chain 50 as in the above steps 2 to 5 (FIGS. 5 to 8). By doing so, as shown in FIG. 8, the floating offshore wind power generation facility 100 is installed and constructed in the installation water area. Here, as a method of mooring the offshore wind power generator 12 in the installation water area, the above-described method of mooring the floating structure of the present invention is used. By doing so, the floating offshore wind power generation facility can be easily installed and constructed under the offshore wave action.

As described above, according to the method of mooring a floating structure according to the present invention, a guide including a passage for guiding the movement of the mooring chain and a chain stopper for locking the mooring chain passed through the guide. A method of mooring this floating structure in a water area by pulling up the other end of a mooring chain whose one end is connected to a mooring anchor on the bottom of the water and connecting it to a chain stopper through a guide. The other end side of the messenger rope is locked to the chain stopper and the other end side is connected to the other end side of the mooring chain pulled up on the water, and then the messenger rope is pulled up. As a result, the mooring chain is guided into the guide and the other end of the mooring chain is locked to the chain stopper. Therefore, the lifted mooring chain can be easily guided into the guide by pulling up the messenger rope with a hoisting machine or the like. At the same time, it can be locked to the chain stopper. Therefore, the suspended mooring chain can be easily tied to the floating structure.

Further, according to the method of mooring another floating structure according to the present invention, the messenger rope is configured to include a rope portion and a chain portion that can be locked to the chain stopper. Therefore, the messenger rope is pulled up and the chain is in the middle of being pulled up. It can be locked to the stopper.

Further, according to the method of mooring another floating structure according to the present invention, the pulled-up messenger rope or mooring chain is locked to the chain stopper, and then the messenger rope on the side opposite to the side where the guide of the chain stopper is located. Alternatively, the mooring chain is cut and removed, then the lock on the chain stopper is released to pull up the messenger rope or mooring chain, and the pulled up messenger rope or mooring chain is locked to the chain stopper, so that the messenger rope or mooring chain The length can be adjusted shorter.

Further, according to another method for mooring a floating structure according to the present invention, the surface of the messenger rope is made of a material that does not damage the floating structure. Therefore, for example, the floating body is in a state where the messenger rope is inserted into a guide or the like. When towing a structure, it is possible to prevent the surface of the floating structure from being scratched or the like due to contact with the messenger rope.

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. This 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 chain. Since the offshore wind power generation facility is installed and constructed, the floating offshore wind power generation facility can be easily installed and constructed.

As described above, in the mooring method of the floating structure and the construction method of the floating offshore wind power generation facility according to the present invention, the other end of the mooring chain whose one end is connected to the mooring anchor on the bottom of the water is pulled up to the water to float. By connecting to a structure, it is useful for a method of mooring this floating structure in a water area, and in particular, it is suitable for relatively easily fastening a suspended mooring chain to the floating structure.

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 (guide)
28 Messenger rope 28a End (other end)
28A Rope part 28B Chain part 30 Base part 32 Sheave part 34 Passage 36 Upper end surface 38 Guide groove 40 Chain ring 42 Fixed locking tool 44 Rotating locking tool 46 Actuator 48 Mooring anchor 50, C Mooring chain 50a End (other end side) )
52 Hawser Rope 54 Mooring Buoy 100 Floating Offshore Wind Turbine B Windmill T Tower Z1, Z2 Shaft G Seabed (Water Bottom)
WL sea level

Claims (4)

One end of a floating structure including a guide consisting of a passage for guiding the movement of the mooring chain and a chain stopper for locking the mooring chain passed through the guide is connected to a mooring anchor on the bottom of the water. This floating structure is moored in a water area by pulling the other end of the mooring chain above the water and connecting it to the chain stopper through a guide.
The mooring chain is pulled up after connecting the other end side of the messenger rope whose one end side is locked to the chain stopper and the other end side is passed through the guide to the other end side of the mooring chain pulled up on the water. Has a step to guide the messenger into the guide and lock the other end of the mooring chain to the chain stopper .
The messenger rope is a method for mooring a floating structure, characterized in that a rope portion and a chain portion that can be locked to a chain stopper are alternately arranged . Lock the pulled-up messenger rope or mooring chain to the chain stopper, then cut and remove the messenger rope or mooring chain on the side opposite to the side where the chain stopper guide is located, and then release the lock to the chain stopper. The method for mooring a floating structure according to claim 1, wherein the messenger rope or mooring chain is pulled up, and the pulled up messenger rope or mooring chain is locked to a chain stopper. The method for mooring a floating structure according to claim 1 or 2 , wherein the surface of the messenger rope is made of a material that does not damage the floating structure. By using the method of mooring a floating structure according to any one of claims 1 to 3 , a floating offshore wind power generation facility in which a wind turbine is mounted on the floating structure is installed and constructed in the installation water area. There,
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 chain. A characteristic method of constructing a floating offshore wind turbine.

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