JP6949690B2 - Floating body mooring method and floating body - Google Patents

Description

The present invention relates to a floating body anchored method and floating.

Conventionally, as a floating body moored at sea, a floating ice-sea structure in which an excavator on the seabed is installed is known (see Patent Document 1). Floating ice-sea structures are moored to anchors on the seabed while floating on the ocean via mooring lines.
For such an ice-sea structure, for example, for exploration purposes, after excavating the seabed using an excavator, the mooring position is changed and the ice-sea structure is excavated at another location. For this reason, the ice-sea structure is generally provided with a pulling machine for pulling up the mooring line and a storage unit for storing the mooring line pulled up by the pulling machine.

By the way, if the structure installed on the floating body is a wind power generator or the like, the pulling machine may not be installed on the floating body. This is because it is not necessary to change the mooring position of the floating body later, so that it is not necessary to inspect and maintain the pulling machine, which is a power machine that deteriorates due to the influence of sea conditions. In this case, the tension of the mooring line is adjusted by pulling up the mooring line by a work ship such as a crane vessel and then attaching the mooring line to the floating body.
However, the workboat sways under the influence of sea conditions more than the floating body. For this reason, there are more restrictions on the sea conditions under which the mooring line can be pulled up than when the mooring line is pulled up by a pulling machine installed on the floating body. Therefore, if the number of days that do not meet the sea condition is increased, the mooring work may be prolonged.

As a special work vessel that suppresses rocking, a work vessel capable of controlling the hull attitude is known (see Patent Document 2). This work ship includes a sensor for measuring the hull position and a hull control mechanism for controlling the hull based on the information output from the sensor (see Patent Document 2).
When a work ship is used, the sea conditions for pulling up the mooring line can be relaxed by controlling and stabilizing the hull attitude.

Japanese Unexamined Patent Publication No. 58-126279 JP 2015-003540

However, since the work vessel described in Patent Document 2 is a special work vessel, the number of hulls is small and it is difficult to arrange the work vessel as compared with the general-purpose work vessel not provided with the above-mentioned sensor and hull control mechanism. In addition, the use of a special work vessel is more costly than the use of a general-purpose work vessel.
Further, when the mooring line is pulled up and fixed to the floating body by using the above-mentioned general-purpose work boat, the restrictions on the sea condition are larger than in the case of using the work boat described in Patent Document 2, and the mooring work of the floating body is performed. May be prolonged.

An object of the present invention is a special work boats unnecessary to provide a floating body anchored method and floating Ru can be suppressed prolonged floating mooring operations.

In the floating body mooring method of the present invention, a floating body main body on which an offshore structure is installed, a mooring rope guide installed on the floating body main body, and a detachably attached to the deck of the floating body main body and hung on the mooring rope guide. A floating body mooring method in which a floating body including a pulling machine connected to a mooring line is moored at sea, one end side of the mooring line is arranged on the sea floor, and the other end side of the mooring line is the mooring line guide. The mooring line is pulled up by the pulling machine to adjust the tension of the mooring line, and after the tension is adjusted, the pulling machine is removed from the deck of the floating body main body. do.
According to the floating body mooring method of the present invention, the mooring line can be pulled up by a pulling machine mounted on the deck of the floating body body, which is less affected by sea conditions than a general-purpose work ship such as a crane ship. Therefore, as compared with the case where the mooring line is pulled up using a general-purpose work boat, the restrictions on the sea condition can be relaxed, the number of days when the sea condition is not satisfied can be reduced, and the mooring work can be suppressed from being prolonged. ..
In addition, since it is not necessary to use a special work vessel that controls the attitude of the hull, it does not take time and effort to arrange this special work vessel, and the cost increase due to the use of the special work vessel is suppressed. can.
Further, by pulling up the mooring line to adjust the tension and then removing the pulling machine, which is a power machine, from the deck of the floating body body, it is possible to save the trouble of inspection and maintenance of the pulling machine at sea.

In the floating body mooring method of the present invention, the floating body of the floating body is the installation column on which the offshore structure is installed, the left-side column arranged on the left side of the installation column, and the right-side side arranged on the right side of the installation column. The column is provided with a column, a lower hull connecting the left column, the right column and the installation column, the mooring line guide is installed in the left column and the right column, respectively, and the pulling machine is a deck of the left column. The mooring line, which is detachably attached to the deck of the right side column and is arranged on the seabed, is composed of a temporary mooring line, a first mooring line, a second mooring line, and a third mooring line. The first mooring line is fixed to the installation column, the temporary mooring line is towed by a towboat, the floating body body is placed at the mooring planned position while the first mooring line is stretched, and the floating body body is arranged. Later, the second mooring rope is hung on the mooring rope guide in the left-side column to connect to the pulling machine, the second mooring rope is pulled up by the pulling machine, and after the floating body main body is arranged, the right-side column It is preferable that the third mooring rope is hung on the mooring rope guide and connected to the pulling machine, and the third mooring rope is pulled up by the pulling machine.
According to such a configuration, the floating body can be moored without attaching the pulling machine to the installation column, and the floating body can be moored even when the pulling machine cannot be installed because the offshore structure such as a wind turbine is installed. Become. Further, as compared with the case where the pulling machine is attached to the installation column, the time and effort for removing the pulling machine can be reduced, and the mooring work period can be shortened.

The floating body of the present invention is a floating body used in the above-mentioned floating body mooring method of the present invention, and is used on a floating body main body on which an offshore structure is installed, a mooring line guide installed on the floating body main body, and the mooring line guide. It is provided with a pulling machine connected to a mooring line to be hung, and the pulling machine is detachably mounted on a deck of the floating body main body.
According to the floating body of the present invention, the floating body can be moored at sea by the following procedure. First, one end side of the mooring line is arranged on the seabed, and the other end side of the mooring line is hung on the mooring line guide of the floating body and connected to the pulling machine. Next, the mooring line is pulled up by a pulling machine to adjust the tension of the mooring line. After adjusting the tension, remove the puller from the deck of the floating body.
By mooring the floating body at sea in this way, the mooring line can be pulled up by a pulling machine mounted on the deck of the floating body body, which is less affected by sea conditions than a general-purpose work ship such as a crane vessel. Therefore, as compared with the case where the mooring line is pulled up using a general-purpose work boat, the restrictions on the sea condition can be relaxed, the number of days when the sea condition is not satisfied can be reduced, and the mooring work can be suppressed from being prolonged. ..
In addition, since it is not necessary to use a special work vessel that controls the attitude of the hull, it does not take time and effort to arrange this special work vessel, and the cost increase due to the use of the special work vessel is suppressed. can.
Further, by pulling up the mooring line to adjust the tension and then removing the pulling machine, which is a power machine, from the deck of the floating body body, it is possible to save the trouble of inspection and maintenance of the pulling machine at sea.

In the floating body of the present invention, the pulling machine includes a pulling machine main body and a rotary stand, and a rotary stand is installed between the pulling machine main body and the deck of the floating body main body. It is preferable that a plurality of them are arranged around the pulling machine.
According to such a configuration, the pulling direction of the mooring line by the pulling machine can be changed by rotating the pulling machine main body by the rotary stand. Therefore, the mooring lines hung on the plurality of mooring line guides arranged around the pulling machine can be pulled up. In this way, the pulling machine can be shared for pulling up a plurality of mooring lines, and a floating body capable of pulling up a plurality of mooring lines can be configured even if the deck space of the floating body body is small.

In the floating body of the present invention, the floating body body includes an installation column on which the offshore structure is installed, a port column arranged on the port side of the installation column, a starboard column arranged on the starboard side of the installation column, and the above. A port column, a lower hull connecting the starboard column and the installation column are provided, the mooring line guide is installed on the port column and the starboard column, respectively, and the pulling machine is a deck of the port column and the starboard column. It is preferable that they are detachably attached to each of the decks.
According to such a configuration, the floating body can be moored at sea by the following procedure, for example. First, of the mooring ropes to be placed on the seabed, the ends of the mooring ropes to be pulled up to the installation column are arranged by pulling the ends in advance so that the work boat can be pulled up without moving. In addition, the other end of the mooring line should be attached to the installation column in advance in a place that is not affected by sea conditions such as inside the dock or on the quay. At that time, the mooring line to be attached to the installation column is adjusted to the final length after the tension is introduced and attached to the installation column. Tow the main body of the floating body at sea to the place where the end of the mooring rope is pulled, pull up the end from the seabed on the work ship, take in the end of the mooring rope attached to the installation column on the work ship, and connect the two on the work ship. .. After that, the floating body was moved to the planned mooring position, then the end of the mooring rope attached to the port column was taken into the work ship as in the installation column, and the end of the mooring rope installed on the seabed was also pulled up to the work ship. Connect on the work boat. The tension is adjusted by returning the connection part to the sea and pulling up the mooring line to a predetermined length with a pulling machine installed on the column. Adjust the tension of the starboard column by the same work. The order of work is random in the port column and starboard column. Finally, the mooring lines are fixed to the port and starboard columns, respectively, and each pull-up machine is removed from the decks of the port and starboard columns, respectively.
In this way, the floating body can be moored without attaching a pulling machine to the installation column, and the floating body can be moored even if the pulling machine cannot be installed because an offshore structure such as a wind turbine is installed.
It will be possible. Further, as compared with the case where the pulling machine is attached to the installation column, the time and effort for removing the pulling machine can be reduced, and the mooring work period can be shortened.

The floating body mooring device as a reference example includes a mooring line guide that can be installed on a floating body main body on which an offshore structure is installed, a mooring line that is hung on the mooring line guide, and a pulling machine that is connected to the mooring line. The pulling machine is characterized in that it can be mounted on and removed from the deck of the floating body body.
According to the floating mooring This established a mooring guides floating body, by attaching a pulling machine to the floating body deck can be pulled over the mooring to mooring guides. Therefore, the sea condition can be relaxed, the number of days when the sea condition is not satisfied can be reduced, and the mooring work can be suppressed from being prolonged, as compared with the case where the mooring line is pulled up by a general-purpose work boat such as a crane vessel.
In addition, since it is not necessary to use a special work vessel that controls the attitude of the hull, it does not take time and effort to arrange this special work vessel, and the cost increase due to the use of the special work vessel is suppressed. can.
Further, by pulling up the mooring line to adjust the tension and then removing the pulling machine, which is a power machine, from the deck of the floating body body, it is possible to save the trouble of inspection and maintenance of the pulling machine at sea.

In the floating body mooring device as a reference example, the pulling machine includes a pulling machine main body and a rotary stand, and a rotary stand is installed between the pulling machine main body and the deck of the floating body main body, and the mooring line is provided. The guide is preferably composed of a plurality of mooring line guides arranged around the pulling machine.
According to such a configuration, by attaching the rotary stand to the deck of the floating body body, the pulling machine can be rotatably installed on the deck, and the pulling direction of the mooring line by the pulling machine can be changed by the rotation. Therefore, the mooring lines hung on the plurality of mooring line guides arranged around the pulling machine can be pulled up. In this way, the pulling machine can be shared for pulling up a plurality of mooring lines, and a floating body capable of pulling up a plurality of mooring lines can be configured even if the deck space of the floating body body is small.

According to the present invention, a special work boats unwanted, can provide a floating body anchored method and floating Ru can be suppressed prolonged floating mooring operations.

The perspective view which shows the floating body which concerns on embodiment of this invention. The perspective view which shows the main part of the floating body which concerns on the said Embodiment. The perspective view which shows the operation of the main part of the floating body which concerns on the said Embodiment. The explanatory view which shows the floating body preparation process of the floating body which concerns on the said embodiment. The explanatory view which shows the temporary mooring process of the floating body which concerns on the said embodiment. The explanatory view which shows the chain connection of the floating body which concerns on the said embodiment. Explanatory drawing which shows the center column mooring of the floating body which concerns on the said embodiment. Explanatory drawing which shows the 2nd and 3rd chain connection of the floating body which concerns on the said embodiment. The explanatory view which shows the chain pull-up of the floating body which concerns on the said embodiment. The explanatory view which shows the 3rd chain connection of the floating body which concerns on the said embodiment. The explanatory view which shows the 2nd chain connection of the floating body which concerns on the said embodiment. The explanatory view which shows the equipment removal process of the floating body which concerns on the said Embodiment.

[Structure of the present embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIGS. 1 and 2, the floating body 1 according to the present embodiment is moored by a chain 3 which is a mooring line in a state where a wind power generation device 2 which is an offshore structure is installed and floats on the offshore.

The floating body 1 includes a floating body main body 10, a chain sheave 20 (mooring rope guide), a chain stopper 30 (mooring rope stopper), a pulling machine 40, and a direction changing winch 50.

The floating body body 10 includes a port side column 11 (port column), a starboard side column 12 (starboard column), a center column 13, and a lower hull 14 (14A, 14B). The port side column 11 is connected to the center column 13 by the lower hull 14A and is arranged on the port side of the center column 13. The starboard side column 12 is connected to the center column 13 by the lower hull 14B and is arranged on the starboard side of the center column 13.
The floating body body 10 is formed in a substantially V-shape in a plan view, and is configured so that the buoyancy can be adjusted by taking in and out of seawater.

The port side column 11, the starboard side column 12, and the center column 13 include decks 111, 121, and 131 (column decks), respectively.
A chain sheave 20, a pulling machine 40, and a direction changing winch 50 are installed on the deck 111 of the port side column 11 and the deck 121 of the starboard side column 12.
Further, side decks 15 are provided on the side surfaces of the port side column 11 and the side surfaces of the starboard side column 12, respectively. Each side deck 15 is formed with three holes 16 through which the chain 3 can be inserted. Each hole 16 is configured so that the chain stopper 30 can be fitted from above. A fair leader 17 is provided below each hole 16.
In the present embodiment, the chain stopper 30 described above is mounted on the side deck 15, but the present invention is not limited to this, and the chain stopper 30 may be mounted on the decks 111 and 121, for example.

The center column 13 is configured as an installation column in which the wind power generation device 2 is installed on the deck 131.
A side deck 15 is provided on the side surface of the center column 13, and the side deck 15 is formed with two holes 16 through which the chain 3 can be inserted. A chain stopper 30 can be fitted into each hole 16. A fair leader 17 is provided below each hole 16.

Three chain sheaves 20 (20A, 20B, 20C) are installed on the deck 111 of the port side column 11, and are arranged at positions where the chain pulling directions intersect. In this embodiment, each chain sheave 20, each hole 16, and each fair leader 17 are arranged along a vertical line.

The chain stopper 30 is composed of half-split bodies 301 and 302 capable of sandwiching the chain 3. The halves 301 and 302 are fitted into the holes 16 from above with the chain 3 sandwiched therein, thereby stopping the downward feeding of the chain 3.

The pulling machine 40 is installed on the deck 111 of the port side column 11. The pulling machine 40 is arranged on one intersection where the chain pulling directions of the chain sheaves 20A, 20B, and 20C intersect. Therefore, the chain sheaves 20A, 20B, and 20C are arranged around the pulling machine 40.

The pulling machine 40 includes a chain winch 41 (a pulling machine main body) and a rotary stand 42. The rotary base 42 is arranged between the chain winch 41 and the deck 111. It is fixed to the deck 111 by bolting or the like. The rotary base 42 can be removed from the deck 111 by pulling out bolts or the like.

Since the chain winch 41 is arranged on the rotary base 42, the chain winch 41 can rotate in the rotation direction R about the vertical axis with respect to the deck 111. Here, by fixing the chain winch 41 itself to the deck 111 by bolting or the like, the chain pulling direction by the pulling machine 40 can be fixed. Further, the fixing in the chain pulling direction can be released by pulling out the bolt or the like.

The direction change winch 50 is installed on the deck 111 of the port side column 11 as shown in FIG.
As shown in FIG. 3, the direction change winch 50 is configured so that the pulling machine 40 can be rotated in the rotation direction R by winding the wire 51 around the pulling machine 40 and winding the wire 51. As a result, the chain pulling direction of the pulling machine 40 is changed so that the chain pulling direction of the pulling machine 40 faces the chain pulling direction of any one of the chain sheaves 20A, 20B, and 20C.
Further, the direction changing winch 50 is configured to rotate the wire 51 in the opposite direction and wind the wire 51 by the direction changing winch 50 so that the pulling machine 40 can rotate in the rotation direction R in the direction opposite to the rotation. ..
The direction change winch 50 is fixed to the deck 111 by bolting or the like, and can be released from being fixed to the deck 111 by removing the bolt or the like.

Since the chain sheave 20 (20A, 20B, 20C), the chain stopper 30, the pulling machine 40, and the direction change winch 50 are similarly installed on the starboard side column 12, detailed description thereof will be omitted.

[Floating body mooring method]
Hereinafter, the floating body mooring method of the floating body 1 according to the present embodiment will be described.
This floating body mooring method includes an anchor chain laying step, a floating body preparation step, a floating body temporary mooring step, a floating body mooring step, and an equipment removal step.

The anchor chain laying process is as follows.
In the site sea area where the floating body 1 is moored, a predetermined number of anchors for main mooring are arranged at a predetermined seabed position by a work boat. One end of the chain 3 is connected to each anchor, and the other end is connected to a floater floating on the sea surface via a wire. Further, one end of the temporary mooring rope 4 (4A, 4B) shown in FIG. 5 is also connected to the anchor for temporary mooring, and the other end is connected to the floater via a wire.
In the present embodiment, there are eight anchors for main mooring and two anchors for temporary mooring. The mooring chain 3 includes first chains 31, 32 for connecting to the center column 13, second chains 33, 34, 35 for connecting to the port side column 11, and a starboard side column. There are third chains 36, 37, 38 for connecting to 12 (see FIG. 8).
On the other hand, pull up the two ends of the anchor chain onto the work ship and pull them with the maximum design load using a device that creates tension in the chain, such as a chain puller installed on the ship, and confirm that they are satisfied. Since the final anchor position is determined by this anchor tension test, it is possible to calculate the chain length that must be stopped at the chain stopper 30 in order to exert the required tension.
The ends of the two chains 3 connected to the center column 13 are pulled to a predetermined position so that they can be pulled up by the work boat 7 without moving.
The anchor chain laying process may be completed by the floating body temporary mooring process.

The floating body preparation process is as follows.
First, in the example shown in FIG. 4, the starboard side column 12 and the center column 13 of the floating body body 10 are arranged along the quay 8. A chain sheave 20 and a chain stopper 30 are previously installed on the port side column 11 and the starboard side column 12 of the floating body body 10. A chain stopper 30 is installed in advance on the center column 13. Next, the pre-rig chain 3A (see FIG. 2), the wind power generator 2, the pull-up machine 40, and the direction change winch 50 are attached to the floating body body 10. Each chain winch 41 is arranged with its chain pulling direction facing the chain pulling direction of each chain sheave 20B, and is fixed to decks 111 and 121 with bolts or the like. This work can also be done in the dock and is not location specific.

The pre-rig chain 3A is hung on each chain sheave 20, inserted through each hole 16, and hung on each fair leader 17. The pre-rig chain 3A attached to the center column 13 is adjusted to the final length after tension is introduced in advance, and is locked to the center column 13 by the chain stopper 30. Of the pre-rig chains 3A hung on the chain sheave 20B installed on the port side column 11 and the starboard side column 12, the chain to be pulled up first in the field sea area is connected to each pulling machine 40 and immediately pulled up in the field sea area. It is said that it will be in a state of being.
The wind power generator 2 is installed on the deck 131 of the center column 13.
The pulling machine 40 and the direction change winch 50 are installed on the deck 111 of the port side column 11 and the deck 121 of the starboard side column 12, respectively. Specifically, the pulling machine 40 and the direction change winch 50 are lifted by a work boat 7 such as a crane vessel, lowered onto the decks 111 and 121, and arranged on the decks 111 and 121 by bolting or the like as described above. It is fixed.
A generator or the like is also installed on the decks 111 and 121.

The floating body temporary mooring process is as follows.
The floating body 1 prepared in the floating body preparation process is towed by a tugboat to the site sea area where the anchor, the chain 3, and the temporary mooring line 4 are laid, and as shown in FIG. Place it in the initial position separated by a distance.
Next, the temporary mooring line 4A is pulled up by the work boat and connected to the starboard side column 12. Further, the temporary mooring line 4B is pulled up by the work boat and connected to the port side column 11. The temporary mooring lines 4A and 4B are crossed and stretched as shown in FIG. Then, in the floating body 1, the lower hulls 14A and 14B are connected to the work vessel 7 via a connecting rope, and the work vessel 7 applies a tensile force in the direction away from the temporary mooring ropes 4A and 4B. In this embodiment, a crane vessel is used as the work vessel 7.
In this way, the floating body 1 is temporarily moored at the initial position.

The floating body mooring process is as follows.
First, the first chains 31 and 32 that have been drawn in advance are stretched on the center column 13 of the floating body body 10. Specifically, before connecting the work vessel 7 to the floating body body 10 by the connecting rope,
The first chains 31 and 32 are pulled up from the seabed by the work vessel 7, and as shown in FIG. 6, each prerig chain 3A attached to the center column 13 in the floating body preparation process also works. It is taken into the ship 7, connected to each other on the work ship 7, and the connected chain is returned to the sea. Subsequently, as shown in FIG. 7, the connecting rope connecting the work boat 7 and the floating body main body 10 is removed from the floating body main body 10, and the floating body main body 10 is towed to the mooring planned position X by the tugboat. By this traction, the first chains 31 and 32 are pulled and stretched in the normal direction.
The lengths of the first chains 31 and 32 are adjusted to the length after the tension is introduced by the catenary calculation when the predetermined tension is introduced. Further, the temporary mooring lines 4A and 4B are removed from the floating body main body 10 before being towed by the tugboat.
The procedure for pulling up and connecting the chains 33 to 38, which will be described later, is the same as the procedure for pulling up and connecting the first chains 31 and 32, and thus the description thereof will be omitted.

Next, the second chain 34 is stretched on the port side column 11. Specifically, the second chain 34 is pulled up from the seabed by the work vessel 7 shown by the solid line in FIG. 8 and connected to the end of the pre-rig chain 3A attached to the port side column 11 taken into the work vessel 7. Here, the pre-rig chain 3A to which the second chain 34 is connected is in a state of being hung on the chain sheave 20B and connected to the pulling machine 40.
After connecting the second chain 34 to the pre-rig chain 3A, the connecting portion is returned to the sea, and then the second chain 34 is wound up by the pulling machine 40. As a result, the second chain 34 is pulled up to form a predetermined catenary curve, and the chain tension is adjusted. After adjusting the chain tension, the second chain 34 is locked to the port side column 11 by the chain stopper 30. The pulled-up excess chain is cut at the upper position of the chain stopper 30 and then collected on the work vessel 7.

Next, the third chain 37 is stretched on the starboard side column 12. Specifically, the third chain 37 is pulled up from the seabed by the work vessel 7 shown by the dotted line in FIG. 8 and connected to the end of the pre-rig chain 3A attached to the starboard side column 12 taken into the work vessel 7. Here, the pre-rig chain 3A to which the third chain 37 is connected is in a state of being hung on the chain sheave 20B and connected to the pulling machine 40.
After connecting the third chain 37 to the pre-rig chain 3A, the connecting portion is returned to the sea, and then the third chain 37 is wound up by the pulling machine 40 as shown in FIG. As a result, the third chain 37 is pulled up to form a predetermined catenary curve, and the chain tension is adjusted. After adjusting the chain tension, the third chain 37 is locked to the starboard side column 12 by the chain stopper 30. The surplus chain pulled up is collected on the work vessel 7 after being cut at the upper position of the chain stopper 30. During the collection, the chain 3 is stopped when the end of the cut chain 3 comes to the front of the drum of the pulling machine 40, and the chain 3 on the side where the chain 3 faces the work boat 7 is also cut at an appropriate position to pull the pulling machine 40. It is assumed that the chain 3 remains inside. The connection work of the second chain 34 and the connection work of the third chain 37 are in no particular order.

By stretching the first chains 31, 32, the second chain 34, and the third chain 37, the floating body body 10 is moored in all directions. From this state, the third chains 36 and 38 are additionally stretched to the starboard side column 12 as shown in FIG. 10, and the second chains 33 and 35 are additionally stretched to the port side column 11 as shown in FIG. It will be stretched.

The procedure for attaching the third chain 36 to the starboard side column 12 is as follows. First, the chain winch 41 and the deck 121 are released from being fixed by bolts or the like to make the chain winch 41 rotatable. Subsequently, the pulling machine 40 is rotated in the rotation direction R by the direction change winch 50 as described above, and the chain pulling direction of the pulling machine 40 is changed from the chain pulling direction of the chain sheave 20B to the chain pulling direction of the chain sheave 20C. .. Then, the chain winch 41 is fixed to the deck 121 again, and the pre-rig chain 3A hung on the chain sheave 20C is connected to the chain left in the pulling machine 40.

Next, the third chain 36 is pulled up from the seabed by the work vessel 7, and the end of the pre-rig chain 3A hung on the chain sheave 20C of the starboard side column 12 is also taken into the work vessel 7 and on the work vessel 7. Connect both.
After connecting the third chain 36 to the pre-rig chain 3A, the connection portion is returned to the sea, and the third chain 36 is wound up by the pulling machine 40. As a result, the third chain 36 is pulled up to form a predetermined catenary curve, and the chain tension is adjusted. After adjusting the chain tension, the third chain 36 is locked to the starboard side column 12 by the chain stopper 30. The pulled-up excess chain is cut at the upper position of the chain stopper 30 and then collected on the work vessel 7. During the collection, the chain 3 is stopped when the end of the cut chain 3 comes to the front of the drum of the pulling machine 40, and the chain 3 on the side where the chain 3 faces the work boat 7 is also cut at an appropriate position to pull the pulling machine 40. It is assumed that the chain 3 remains inside.

Next, the third chain 38 is stretched to the starboard side column 12. Specifically, first, the chain winch 41 and the deck 121 are released from being fixed, and the chain winch 41 is brought into a rotatable state. Subsequently, the pulling machine 40 is rotated in the reverse direction in the rotation direction R by the direction change winch 50 as described above, and the chain pulling direction of the pulling machine 40 is changed from the chain pulling direction of the chain sheave 20C to the chain pulling direction of the chain sheave 20A. do. Then, the chain winch 41 is fixed to the deck 121 again, and the pre-rig chain 3A hung on the chain sheave 20A is connected to the chain left in the pulling machine 40.

Next, the third chain 38 is pulled up from the seabed by the work vessel 7, and the end of the pre-rig chain 3A hung on the chain sheave 20A of the starboard side column 12 is also taken into the work vessel 7 and mounted on the work vessel 7. Connecting.
After connecting the third chain 38 to the pre-rig chain 3A, the connection portion is returned to the sea, and the third chain 38 is wound up by the pulling machine 40. As a result, the third chain 38 is pulled up to form a predetermined catenary curve, and the chain tension is adjusted. After adjusting the chain tension, the third chain 38 is locked to the starboard side column 12 by the chain stopper 30. After cutting the excess chain pulled up at the upper position of the chain stopper 30, the entire amount is collected on the work vessel 7.

In the present embodiment, the second chains 33 and 35 are stretched after the third chains 36 and 38 are stretched.
The procedure for attaching the second chain 33 to the port side column 11 is as follows. First, the chain winch 41 and the deck 111 are released from being fixed by bolts or the like to make the chain winch 41 rotatable. Subsequently, the pulling machine 40 is rotated in the rotation direction R by the direction change winch 50 as described above, and the chain pulling direction of the pulling machine 40 is changed from the chain pulling direction of the chain sheave 20B to the chain pulling direction of the chain sheave 20A. .. Then, the chain winch 41 is fixed to the deck 111 again, and the pre-rig chain 3A hung on the chain sheave 20A is connected to the chain left in the pulling machine 40.

Next, the second chain 33 is pulled up from the seabed by the work vessel 7, and the end of the pre-rig chain 3A hung on the chain sheave 20A of the port side column 11 is also taken into the work vessel 7 and both are taken on the work vessel 7. To connect.
After connecting the second chain 33 to the pre-rig chain 3A, the connecting portion is returned to the sea, and the second chain 33 is wound up by the pulling machine 40. As a result, the second chain 33 is pulled up to form a predetermined catenary curve, and a chain tension is formed. After adjusting the chain tension, the second chain 33 is locked to the port side column 11 by the chain stopper 30. The pulled-up excess chain is cut at the upper position of the chain stopper 30 and then collected on the work vessel 7. During the collection, the chain 3 is stopped when the end of the cut chain 3 comes to the front of the drum of the pulling machine 40, and the chain 3 on the side where the chain 3 faces the work boat 7 is also cut at an appropriate position to pull the pulling machine 40. It is assumed that the chain 3 remains inside.

Next, the second chain 35 is stretched to the portside column 11. Specifically, first, the chain winch 41 and the deck 111 are released from being fixed, and the chain winch 41 is brought into a rotatable state. Subsequently, the pulling machine 40 is rotated in the reverse direction in the rotation direction R by the direction change winch 50 as described above, and the chain pulling direction of the pulling machine 40 is changed from the chain pulling direction of the chain sheave 20A to the chain pulling direction of the chain sheave 20C. do. Then, the chain winch 41 is fixed to the deck 111 again, and the pre-rig chain 3A hung on the chain sheave 20C is connected to the chain left in the pulling machine 40.

Next, the second chain 35 is pulled up from the seabed by the work vessel 7, and the end of the pre-rig chain 3A hung on the chain sheave 20C of the port side column 11 is also taken into the work vessel 7 and both are taken on the work vessel 7. To connect.
After connecting the second chain 35 to the pre-rig chain 3A, the connecting portion is returned to the sea, and the second chain 35 is wound up by the pulling machine 40. As a result, the second chain 35 is pulled up to form a predetermined catenary curve, and the chain tension is adjusted. After adjusting the chain tension, the second chain 35 is locked to the port side column 11 by the chain stopper 30. After cutting the excess chain pulled up at the upper position of the chain stopper 30, the entire amount is collected on the work vessel 7.

Here, the conventional chain pulling operation is performed by the work vessel 7 which is more easily affected by the sea conditions than the floating body body 10 in the open ocean (outside the port) where the offshore wind power is applied. Therefore, the weather and sea conditions under which the chain can be pulled up by the work vessel 7 are restricted to, for example, a significant wave height of 1.0 m or less and an average wind speed of 10 m / s or less.
On the other hand, the above-mentioned pulling work of the second chains 33 to 35 and the third chains 36 to 38 is performed by the pulling machine 40 installed on the floating body body 10 which is less affected by the sea conditions and less likely to shake than the work boat 7. .. Therefore, the sea conditions under which the chain can be pulled up can be relaxed to, for example, a significant wave height of 2.0 m or less.

The equipment removal process is as follows.
In the present embodiment, first, the equipment on the deck 111 of the port side column 11 is removed, and then the equipment on the deck 121 of the starboard side column 12 is removed.
The removal of equipment on deck 111 is as follows. The pulling machine 40 is released from being fixed to the deck 111 by pulling out bolts or the like. Subsequently, as shown in FIG. 12, the pulling machine 40 is lifted by the work boat 7 and removed from the deck 111.
Further, the direction change winch 50 is also released from being fixed to the deck 111, lifted by the work boat 7, and removed from the deck 111.
Although not shown, the generator installed on the deck 111 will also be removed.

Since the removal of the pulling machine 40, the direction changing winch 50, the generator, etc. on the deck 121 is performed in the same manner as the removal of the pulling machine 40, the direction changing winch 50, the generator, etc. on the deck 111, detailed description thereof will be omitted.
As described above, the floating body 1 is moored at sea.

[Effect of this embodiment]
(1) In the present embodiment, the floating body 1 is pulled up connected to a floating body main body 10 on which the wind power generation device 2 is installed, a chain sheave 20 installed on the floating body main body 10, and a chain 3 hung on the chain sheave 20. The pulling machine 40 is provided with the machine 40, and is characterized in that the pulling machine 40 is detachably mounted on the decks 111 and 121 of the floating body body 10.
Since it has the above configuration, first, one end side of the chain 3 is arranged on the seabed, and the other end side of the chain 3 is previously hung on the chain sheave 20 of the floating body 1 in a place not affected by sea conditions such as inside a dock or a quay. The chain 3 is pulled up by the pulling machine 40 to adjust the tension of the chain 3, and after adjusting the chain tension, the pulling machine 40 is removed from the decks 111 and 121 of the floating body body 10. Floating body 1 can be moored at sea.
By mooring the floating body 1 at sea in this way, the chain 3 can be pulled up by the pulling machine 40 mounted on the decks 111 and 121 of the floating body body 10 which is less affected by sea conditions than the general-purpose work vessel 7. Therefore, as compared with the case where the chain 3 is pulled up by using the general-purpose work vessel 7, the restrictions on the sea condition can be relaxed, the number of days when the sea condition is not satisfied can be reduced, and the mooring work can be suppressed from being prolonged. can.
In addition, since it is not necessary to use a special work vessel that controls the attitude of the hull, it does not take time and effort to arrange a special work vessel, and it is possible to suppress an increase in cost due to the use of the special work vessel. ..
Further, by pulling up the chain 3 to adjust the tension and then removing the pulling machine 40 which is a power machine from the decks 111 and 121 of the floating body body 10, it is possible to save the trouble of inspection and maintenance of the pulling machine 40 at sea. can.
Further, in the present embodiment, the following effects can be exhibited.

(2) The pulling machine 40 includes a chain winch 41 and a rotary stand 42, and a rotary stand 42 is installed between the chain winch 41 and the deck 111 (deck 121) of the floating body body 10, and the chain sheave 20 Are arranged around the pulling machine 40. Therefore, the pulling direction of the chain 3 by the pulling machine 40 can be changed by rotating the chain winch 41 by the rotary stand 42. Therefore, the chains 3 hung on the plurality of chain sheaves 20 (20A, 20B, 20C) arranged around the pulling machine 40 can be pulled up. In this way, the pulling machine 40 can be shared for pulling up the plurality of chains 3, and the floating body 1 capable of pulling up the plurality of chains 3 can be configured even if the deck space of the floating body main body 10 is small.

(3) The floating body 1 includes a chain stopper 30 installed on the floating body main body 10. Therefore, after the chain 3 is pulled up by the pulling machine 40, the chain 3 can be easily fixed to the floating body main body 10 by the chain stopper 30, and the chain 3 can be fixed to the floating body main body 10 by the chain stopper 30. The connection with the pulling machine 40 can be easily released. Therefore, the pulling machine 40 can be easily removed.

(4) The floating body 10 includes a center column 13 in which the wind power generator 2 is installed, a port side column 11 arranged on the port side of the center column 13, and a starboard side column 12 arranged on the starboard side of the center column 13. And lower hulls 14 (14A, 14B) connecting the port side column 11, the starboard side column 12 and the center column 13, and the chain sheave 20 is installed on the port side column 11 and the starboard side column 12, respectively. The pulling machine 40 is detachably mounted on the deck 111 of the port side column 11 and the deck 121 of the starboard side column 12, respectively. For this reason, first, the other end side of the chain 3 adjusted to the tensioned chain length is attached to the center column 13 in advance in a place not affected by sea conditions such as in a dock or a quay, and installed on the seabed in advance. It connects to the end of the existing chain 3 at sea. Next, the floating body body 10 is moved to the planned mooring position X at sea, and then the chain sheave 20 of the port side column 11 and the starboard side column 12 is hung on the other end side of the chain 3 and connected to each pulling machine 40. Then, the tension is adjusted by pulling up the chain 3 by each pulling machine 40, and finally, the chain 3 is fixed to the port side column 11 and the starboard side column 12, respectively, and each pulling machine 40 is attached to the port side column 11 and the star. The floating body 1 can be moored offshore by removing it from the decks 111 and 121 of the board side column 12, respectively.
In this way, the floating body 1 can be moored without attaching the pulling machine 40 to the center column 13, and the time and effort for removing the pulling machine 40 can be reduced as compared with the case where the pulling machine 40 is attached to the center column 13, and the mooring work period. Can be shortened.

(5) In the present embodiment, the chain sheave 20 that can be installed on the floating body main body 10 on which the wind power generation device 2 is installed, the chain 3 that is hung on the chain sheave 20, and the pulling machine 40 that is connected to the chain 3 are provided. The pulling machine 40 can form a floating body mooring device that can be attached to and removed from the deck 111 (deck 121) of the floating body main body 10. According to this floating body mooring device, the same effect as that of the floating body 1 described above can be exhibited.

[Modification example]
The present invention is not limited to the configuration described in the above embodiments, and modifications within the range in which the object of the present invention can be achieved are included in the present invention.
For example, in the above embodiment, the pulling machine 40 is mounted on the deck 111 of the port side column 11 and the deck 121 of the starboard side column 12, respectively, but is not limited to this, and is mounted on only one of the decks 111 and 121. May be done.
Further, the deck 131 of the center column 13 is not provided with a mounting space for the pulling machine 40, and the pulling machine 40 is not mounted. However, for example, the deck 131 is provided with the mounting space and the deck 131 is provided with the pulling machine. 40 may be attached. In this case, the pulling machine 40 may not be mounted on one or both of the decks 111 and 121.

In the above embodiment, a plurality of chain sheaves 20 (20A, 20B, 20C) are arranged around one pulling machine 40, but the present invention is not limited to this, and for example, only one chain sheave 20 is the pulling machine 40. It may be arranged around. In this case, since it is not necessary for the pulling machine 40 to change the chain pulling direction, the configuration of the rotary stand 42 may be omitted. Further, in this case, the direction change winch 50 may also be omitted.

In the above embodiment, one pulling machine 40 is shared for the chain sheaves 20A, 20B, 20C, but the present invention is not limited to this, and for example, the number of small pulling machines corresponding to each of the chain sheaves 20A, 20B, 20C is small. You may install a machine.

In the above embodiment, the floating body body 10 is formed in a substantially V-shape in a plan view, but is not limited to this shape, and may be a Y-shape in a plan view, a polygonal shape in a plan view (octagonal shape in a plan view), or the like. good.

In the above embodiment, the chain stopper 30 is composed of half-split bodies 301 and 302 that can be fitted into the holes 16, but the chain stopper 30 is not limited to the above configuration as long as it has a shape that can lock the chain 3.

In the above embodiment, after the first chains 31 and 32 are stretched, the second chain 34, the third chain 37, the third chain 36, the third chain 38, the second chain 33, and the second chain 35 are stretched in this order. However, the order is not limited to this, and the order of installation can be changed as appropriate in consideration of the site conditions (conditions such as the direction of wind and waves) and the movement of the work boat 7.
For example, the third chain 37 may be stretched before the second chain 34, and in this case, the second chains 33 and 35 may be stretched before the third chains 36 and 38. good.
Further, the order in which the second chains 33 to 35 are stretched and the order in which the third chains 36 to 38 are stretched can be changed as appropriate in consideration of the site situation, the movement of the work boat 7, and the like.

In the above embodiment, the chain sheave 20 is used as a temporary mooring guide, but the present invention is not limited to this, and for example, a sliding guide may be used as a temporary mooring guide.

In the above embodiment, the floating body body 10 is temporarily moored by the temporary mooring line 4, but the present invention is not limited to this, and when the floating body body 10 can be positioned at the initial position by the tugboat, the floating body body 10 is not temporarily moored by using the temporary mooring line. May be good.

In the above embodiment, the crane vessel is adopted as the work vessel 7, but the present invention is not limited to this, and the work vessel may be a work vessel not provided with a crane and provided with a winch or the like for pulling up the chain 3. In this case, in the equipment removal step, a crane vessel is used to lift and remove the pulling machine 40 separately from the work vessel.

In the above embodiment, the wind power generation device 2 is installed as an offshore structure on the floating body 1, but the present invention is not limited to this, and any offshore structure that does not require a change in the mooring position after mooring may be used. For example, a substation connected to the wind power generation device 2 by a cable or the like may be installed.

1 ... Floating body, 10 ... Floating body body, 11 ... Port side column (port column), 111, 121, 131 ... Deck, 12 ... Starboard side column (starboard column), 13 ... Center column (installation column), 14 (14A) , 14B) ... Lower hull, 15 ... Side deck, 16 ... Hole, 17 ... Fair leader, 2 ... Wind power generator (offshore structure), 20 (20A, 20B, 20C) ... Chain sheave (mooring line guide), 3 ( 3A, 31-38) ... Chain (mooring line), 30 ... Chain stopper (mooring line stopper), 301, 302 ... Half split, 4 (4A, 4B) ... Temporary mooring line, 40 ... Puller, 41 ... Chain Winch (puller body), 42 ... rotary stand, 50 ... direction change winch, 51 ... wire, 7 ... work boat, 8 ... quay, R ... rotation direction, X ... mooring planned position.

Claims (5)

A floating body on which an offshore structure is installed, a mooring line guide installed on the floating body, and a pulling machine that is detachably attached to the deck of the floating body and connected to a mooring line hung on the mooring line guide. This is a floating body mooring method in which a floating body equipped with and is moored at sea.
Place one end of the mooring line on the seabed
The other end side of the mooring line is hung on the mooring line guide and connected to the pulling machine.
The mooring line is pulled up by the pulling machine to adjust the tension of the mooring line.
After adjusting the tension, remove the pulling machine from the deck of the floating body.
A floating body mooring method characterized by that. In the floating body mooring method according to claim 1,
The floating body of the floating body includes an installation column on which the offshore structure is installed, a port column arranged on the port side of the installation column, a starboard column arranged on the starboard side of the installation column, the port column, and the above. A right-side column and a lower hull connecting the installation column are provided, the mooring line guide is installed on the port-side column and the starboard-side column, respectively, and the pulling machine is installed on the deck of the port-side column and the deck of the starboard column, respectively. It is attached to be removable and is attached.
The mooring line arranged on the seabed is composed of a temporary mooring line, a first mooring line, a second mooring line, and a third mooring line.
The first mooring line is fixed to the installation column,
The temporary mooring line is towed by a tugboat, and the floating body main body is placed at the mooring planned position while the first mooring line is stretched.
After arranging the floating body body, the second mooring line is hung on the mooring line guide in the port column to be connected to the pulling machine, and the second mooring line is pulled up by the pulling machine.
After arranging the floating body main body, the third mooring line is hung on the mooring line guide in the starboard column, connected to the pulling machine, and the third mooring line is pulled up by the pulling machine.
A floating body mooring method characterized by that. A floating body used in the floating body mooring method according to claim 1 or 2.
Floating body where offshore structures are installed and
The mooring line guide installed on the floating body and
It is equipped with a pulling machine connected to the mooring line hung on the mooring line guide.
The pulling machine is a floating body characterized in that it is detachably mounted on the deck of the floating body main body. In the floating body according to claim 3,
The pulling machine includes a pulling machine main body and a rotary stand.
A rotary stand is installed between the pulling machine main body and the deck of the floating body main body.
A plurality of the mooring line guides are arranged around the pulling machine. In the floating body according to claim 3 or 4.
The floating body includes an installation column on which the offshore structure is installed, a port column arranged on the port side of the installation column, a starboard column arranged on the starboard side of the installation column, a port column, and a starboard column. And with a lower hull to connect the installation column
The mooring line guides are installed in the port column and the starboard column, respectively.
The pulling machine is a floating body that is detachably mounted on the deck of the port column and the deck of the starboard column, respectively.

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