JP2019098963A - Floating body, floating body mooring device and floating body mooring method - Google Patents

Abstract

To provide a floating body, a floating body mooring device and a floating body mooring method capable of suppressing the prolonged mooring work of the floating body.SOLUTION: A floating body 1 comprises: a floating main body 10 on which a wind power generator 2 is installed; a chain sheave 20 installed on the floating main body 10; and a pulling-up machine 40 connected to a chain wound on the chain sheave 20. The pulling-up machine 40 is removably attached to a deck 111 of a port side column 11 on the floating main body 10 and to a deck 121 of a starboard side column 12 on the floating main body 10, respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floating body moored on the ocean, a floating body mooring apparatus and a floating body mooring method.

DESCRIPTION OF RELATED ART Conventionally, the floating type ice sea structure in which the drilling apparatus of a seabed is installed as a floating body moored on the sea is known (refer patent document 1). The floating ice-sea structure is moored to the seabed anchor via floating mooring lines.
Such an ice-sea structure, for example, for exploration purposes, is to excavate the seabed with a drilling rig, change the mooring position, and excavate at another location. For this reason, the ice-sea structure is generally provided with a pull-up machine for pulling the mooring cords and a storage unit for storing the mooring cords pulled up by the pull-up machine.

By the way, when the structure installed in a floating body is a wind power generator etc., a pulling machine may not be installed in a floating body. This is because it is not necessary to change the mooring position of the floating body later, thereby eliminating the need for inspection, maintenance, and the like of the pulling machine which is a power machine that is deteriorated due to the influence of the sea condition. In this case, the tension of the mooring cord is adjusted by pulling up the mooring cord by a working ship such as a crane ship and then attaching the mooring cord to the floating body.
However, the work ship sways with greater influence of the sea than the floating body. For this reason, compared with the case where a mooring line is pulled up with the pulling machine installed in the floating body, restrictions of the sea condition condition which can be pulled up of a mooring line are large. Therefore, if the number of days that do not meet the sea conditions increases, the mooring work may be prolonged.

A working boat capable of controlling the attitude of the hull is known as a special type of working boat that suppresses swing (see Patent Document 2). This work boat includes a sensor that measures the position of the hull, and a hull control mechanism that controls the hull based on the information output from the sensors (see Patent Document 2).
When a work boat is used, by controlling and stabilizing the attitude of the hull, it is possible to alleviate the sea condition that can perform the work of pulling up the mooring cord.

Japanese Patent Application Laid-Open No. 58-126279 JP, 2015-003540, A

However, since the work boat described in Patent Document 2 is a special work boat, the number of hulls is small and it is difficult to arrange as compared with a general-purpose work boat without the above-described sensor and hull control mechanism. In addition, the use of special work vessels is more expensive than the use of general purpose work vessels.
In addition, when mooring cords are pulled up and fixed to the floating body using the general-purpose work ship described above, the restriction of sea conditions is large compared to the case where the work ship described in Patent Document 2 is used, and mooring work of the floating body May be prolonged.

  An object of the present invention is to provide a floating body, a floating body mooring device and a floating body mooring method which can eliminate the need for a special work boat and prolong the mooring operation of the floating body.

  The floating body of the present invention comprises a floating body main body on which an offshore structure is installed, a mooring cord guide installed on the floating body main body, and a pulling machine connected to the mooring cord hung on the mooring cord guide The machine is characterized by being removably mounted on the deck of the floating body.

According to the floating body of the present invention, the floating body can be moored on the ocean by the following procedure. First, one end of the mooring cord is placed on the seabed, and the other end of the mooring cord is stretched around the mooring cord guide of the floating body and connected to the pulling machine. Next, the mooring cord is pulled up by a pulling machine to adjust the tension of the mooring cord. After tension adjustment, remove the puller from the deck of the floating body.
By mooring the floating body on the ocean in this manner, the mooring cord can be pulled up by the pulling machine mounted on the deck of the floating body main body, which is less affected by the sea state than a general-purpose work vessel such as a crane ship. For this reason, compared with the case where a mooring cord is pulled up using a general-purpose work vessel, the restriction of the sea condition can be eased, the number of days when the sea condition is not satisfied can be reduced, and the prolongation of the mooring work can be suppressed. .
In addition, since it is not necessary to use a special work boat for controlling the attitude of the hull, it is not necessary to arrange time and labor for arranging this special work boat, and it is also possible to suppress the cost increase due to the use of a special work boat. it can.
Furthermore, after the mooring cord is pulled up to adjust the tension, by removing the pulling machine which is a power machine from the deck of the floating body main body, it is possible to save the trouble of inspection and maintenance of the pulling machine on the ocean.

In the floating body according to the present invention, the pulling machine includes a pulling machine main body and a rotating stand, and the rotating stand is installed between the pulling machine main body and the deck of the floating body, and the mooring cord guide is Preferably, a plurality of the filters are arranged around the pulling machine.
According to such a configuration, it is possible to change the pulling direction of the mooring cord by the pulling machine by rotating the pulling machine main body by the rotating stand. For this reason, the mooring cords that can be hung on the plurality of mooring cord guides arranged around the pulling machine can be respectively pulled up. Thus, the pulling machine can be shared to pull up a plurality of mooring cords, and a floating body capable of pulling up a plurality of mooring cords can be configured even if the deck space of the float body is narrow.

In the floating body according to the present invention, the floating body main body includes an installation column on which the offshore structure is installed, a port column located on the port side of the installation column, a starboard column located on the right side of the installation column, and The lower row column connecting the port side column, the starboard column and the installation column, the mooring guide is installed on the port side column and the starboard column respectively, and the pulling machine is provided on the deck of the port side column and the starboard column Preferably, each of the decks is removably mounted on the deck.
According to such a configuration, for example, the floating body can be moored on the ocean by the following procedure. First, among the mooring cords disposed on the seabed, the ends of the mooring cords that are pulled up to the installation column are drawn in advance so that the work vessels can be pulled up without moving. In addition, the other end side of the mooring cord is attached to the installation column in advance in a place not affected by the sea conditions such as in a dock or a quay. At that time, the mooring cord attached to the installation column is adjusted to the final length after tension introduction and attached to the installation column. Tow the floating body to the place where the mooring rope end was pulled up from the ocean, pull up the end from the seabed on the work vessel, take in the end of the mooring cord attached to the installation column onto the work vessel, and connect both on the work vessel . After that, the floating body is moved to the mooring plan position, and then the end of the mooring cord attached to the port column as well as the installation column is taken onto the work ship, and the end of the mooring cord installed on the sea floor is also pulled up onto the work ship Connect on the work ship. The tension is adjusted by pulling the mooring cord up to a predetermined length by pulling the connection portion back into the sea with a pull machine installed on the column. Adjust the tension on the starboard column in the same way. The order of work is in random order in the port column and the starboard column. Finally, the mooring cords are fixed to the port and starboard columns respectively, and each puller is removed from the decks of the port and starboard columns respectively.
As described above, 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 can not be installed because the offshore structure such as a windmill is installed. Moreover, compared with the case where a pull machine is attached to an installation column, the effort which removes a pull machine can be reduced and a mooring work period can be shortened.

  The floating body mooring apparatus of the present invention comprises a mooring cord guide installable on a floating body main body on which an offshore structure is installed, a mooring cord hung on the mooring cord guide, and a puller connected to the mooring cord. The pulling machine is characterized in that it is configured to be attachable to and removable from the deck of the floating body.

According to the floating body mooring apparatus of the present invention, the mooring cord can be hung on the mooring cord guide and pulled up by installing the mooring cord guide on the floating body main body and attaching the puller to the deck of the floating body main body. For this reason, compared with the case where pulling up a mooring line with a general purpose work ship such as a crane ship, the sea condition can be eased, the number of days when the sea condition is not satisfied can be reduced, and the prolongation of the mooring work can be suppressed.
In addition, since it is not necessary to use a special work boat for controlling the attitude of the hull, it is not necessary to arrange time and labor for arranging this special work boat, and it is also possible to suppress the cost increase due to the use of a special work boat. it can.
Furthermore, after the mooring cord is pulled up to adjust the tension, by removing the pulling machine which is a power machine from the deck of the floating body main body, it is possible to save the trouble of inspection and maintenance of the pulling machine on the ocean.

In the floating body mooring apparatus according to the present invention, the pulling machine includes a pulling machine body and a rotating stand, and the rotating stand is installed between the pulling machine body and the deck of the floating body, and the mooring cable guide Is preferably constituted by a plurality of mooring cord guides arranged around the puller.
According to such a configuration, by attaching the rotary base to the deck of the floating body, the puller can be rotatably installed on the deck, and the pull-up direction of the mooring cord by the puller can be changed by rotation. For this reason, the mooring cords that can be hung on the plurality of mooring cord guides arranged around the pulling machine can be respectively pulled up. Thus, the pulling machine can be shared to pull up a plurality of mooring cords, and a floating body capable of pulling up a plurality of mooring cords can be configured even if the deck space of the float body is narrow.

  The floating body mooring method of the present invention comprises a floating body main body on which an offshore structure is installed, a mooring cord guide installed on the floating body main body, and a pulling machine connected to the mooring cord hung on the mooring cord guide The pulling machine is a floating body mooring method for mooring a floating body removably mounted on a deck of the floating body main body on the ocean, wherein one end side of the mooring cord is arranged on the seabed, and the other end side of the mooring cord Is connected to the pull-up machine, and the pull-up machine pulls up the mooring cord to adjust the tension of the mooring cord, and after tension adjustment, the pull-up machine is from above the deck of the floating body main body It is characterized by removing.

According to the floating body mooring method of the present invention, the mooring cord can be pulled up by a pulling machine attached to the deck of the floating body main body which is less affected by the sea state than a general purpose work ship such as a crane ship. For this reason, compared with the case where a mooring cord is pulled up using a general-purpose work vessel, the restriction of the sea condition can be eased, the number of days when the sea condition is not satisfied can be reduced, and the prolongation of the mooring work can be suppressed. .
In addition, since it is not necessary to use a special work boat for controlling the attitude of the hull, it is not necessary to arrange time and labor for arranging this special work boat, and it is also possible to suppress the cost increase due to the use of a special work boat. it can.
Furthermore, after the mooring cord is pulled up to adjust the tension, by removing the pulling machine which is a power machine from the deck of the floating body main body, it is possible to save the trouble of inspection and maintenance of the pulling machine on the ocean.

  In the floating body mooring method according to the present invention, the floating body main body of the floating body includes an installation column on which the offshore structure is installed, a port column arranged on the port of the installation column, and a starboard arranged on the starboard of the installation column. And a lower hull connecting the port column, the starboard column, and the installation column, the mooring guide is installed on the port column and the starboard column, and the pulling machine is a deck of the port column And the mooring cords releasably mounted on the deck of the starboard column and arranged on the seabed are constituted by temporary mooring cords, first mooring cords, second mooring cords and third mooring cords And fix the first mooring line to the installation column, and towing the temporary mooring line by a charter to stretch the first mooring line to bring the floating body into the mooring planning position And, after the floating body main body is arranged, the first mooring cord is stretched over the mooring cord guide in one of the port column and the starboard column to connect to the pulling machine, and the first pulling machine The mooring cord is pulled up, and after the floating body main body is arranged, the second mooring cord is stretched over the mooring cord guide in the other of the port column and the starboard column and connected to the pulling machine, and the pulling machine It is preferable to pull up the second mooring line.

  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 can not be installed because the offshore structure such as a windmill is installed. Become. Moreover, compared with the case where a pull machine is attached to an installation column, the effort which removes a pull machine can be reduced and a mooring work period can be shortened.

  According to the present invention, it is possible to provide a floating body, a floating body mooring device and a floating body mooring method which can eliminate the need for a special work vessel and prolong the mooring operation of the floating body.

The perspective view showing the floating body concerning the embodiment of the present invention. The perspective view which shows the principal part of the floating body which concerns on the said embodiment. The perspective view which shows the operation | movement of the principal part of the floating body which concerns on the said embodiment. Explanatory drawing which shows the floating body preparatory process of the floating body which concerns on the said embodiment. Explanatory drawing which shows the temporary mooring process of the floating body which concerns on the said embodiment. Explanatory drawing which shows 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, 3rd chain connection of the floating body which concerns on the said embodiment. Explanatory drawing which shows the chain pulling-up of the floating body which concerns on the said embodiment. Explanatory drawing which shows 3rd chain connection of the floating body which concerns on the said embodiment. Explanatory drawing which shows 2nd chain connection of the floating body which concerns on the said embodiment. Explanatory drawing which shows the equipment removal process of the floating body which concerns on the said embodiment.

[Configuration of this embodiment]
Hereinafter, embodiments of the present invention will be described based on the drawings.
In FIG. 1 and FIG. 2, the floating body 1 according to the present embodiment is installed with a wind power generator 2 which is an offshore structure and is moored by a chain 3 which is a mooring cord in a state of floating on the ocean.

  The floating body 1 includes a floating body main body 10, a chain sheave 20 (a mooring cord guide), a chain stopper 30 (a mooring cord stopper), a puller 40, and a direction change winch 50.

The floating body 10 includes a port side column 11 (left column), a starboard side column 12 (right column), a center column 13, and lower hulls 14 (14A, 14B). The port side column 11 is connected to the center column 13 by the lower hull 14A and disposed on the left side of the center column 13. The starboard side column 12 is connected to the center column 13 by the lower hull 14 B and is disposed on the right side of the center column 13.
The floating body main body 10 is formed in a substantially V-shape in a plan view, and is configured to be able to adjust the buoyancy by taking in and out seawater.

The port side column 11, the starboard side column 12 and the center column 13 respectively have decks 111, 121, 131 (column decks).
On the deck 111 of the port side column 11 and the deck 121 of the star board side column 12, a chain sheave 20, a pulling machine 40 and a direction change winch 50 are installed.
A side deck 15 is provided on the side of the port side column 11 and the side of the starboard side column 12, respectively. In each side deck 15, three holes 16 through which the chain 3 can be inserted are respectively formed. Each hole 16 is configured such that the chain stopper 30 can be fitted from above. In addition, below each hole 16, the fair leader 17 is provided.
In addition, in this embodiment, although the chain stopper 30 mentioned above is mounted in the side deck 15, it is not restricted to this, For example, you may be mounted on the deck 111,121.

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

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

  The chain stopper 30 is constituted by halves 301 and 302 capable of sandwiching the chain 3. The half divided bodies 301 and 302 stop the downward extension of the chain 3 by being inserted from above into the hole 16 with the chain 3 being sandwiched.

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

  The pulling machine 40 includes a chain winch 41 (pulling machine main body) and a rotating stand 42. The rotating mount 42 is disposed between the chain winch 41 and the deck 111. It is fixed to the deck 111 by bolting or the like. The rotating stand 42 is removable from the deck 111 by bolt extraction or the like.

  Since the chain winch 41 is disposed on the rotating stand 42, it can rotate in the rotational 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, it is possible to fix the chain pulling direction by the pulling machine 40. In addition, the fixing in the chain pulling up direction can be released by the bolt extraction 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 to be able to rotate the puller 40 in the rotational direction R by hooking a wire 51 around the puller 40 and winding the wire 51. As a result, the chain pulling direction of the pulling machine 40 is changed such that the chain pulling direction of the pulling machine 40 is directed to the chain pulling direction of any of the chain sheaves 20A, 20B, 20C.
Further, the direction change winch 50 is configured to be able to rotate the pulling machine 40 in the rotation direction R in the opposite direction to the above by rotating the wire 51 in a reverse direction and winding the wire 51 by the direction change winch 50. .
The direction change winch 50 is fixed to the deck 111 by bolting or the like, and the fixing to the deck 111 can be released by bolt extraction or the like.

  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, and thus the detailed description will be omitted.

[Floating body mooring method]
Hereinafter, the floating body mooring method of the floating body 1 concerning this embodiment is explained.
This floating body mooring method has an anchor chain laying process, a floating body preparation process, a floating body temporary mooring process, a floating body mooring process, and an equipment removal process.

The anchor chain laying process is as follows.
In the on-site sea area where the floating body 1 is moored, a predetermined number of anchors for main mooring are arranged at predetermined seabed positions by the work boat. One end of a chain 3 is connected to each anchor, and the other end is connected to a floater floating on the sea surface through a wire. Further, one end of the temporary mooring cord 4 (4A, 4B) shown in FIG. 5 is also connected to the temporary mooring anchor, and the other end is connected to the floater via a wire.
In the present embodiment, there are eight anchors for this mooring and two anchors for temporary mooring. In the main mooring chain 3, first chains 31, 32 for connection to the center column 13, second chains 33, 34, 35 for connection to the port side columns 11, starboard side columns There are third chains 36, 37, 38 to be connected to 12 (see FIG. 8).
At the same time, pull up the two ends of the anchor chain onto the work vessel and pull at the design maximum load using equipment that generates tension on the chain such as a chain puller installed on the ship, and confirm that it is satisfactory. 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 necessary tension.
The ends of the two chains 3 connected to the center column 13 are drawn to a predetermined position so that they can be pulled up by the work boat 7 without moving.
In addition, the anchor chain laying process should just 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 main body 10 are disposed along the quay 8. A chain sheave 20 and a chain stopper 30 are installed in advance on the port side column 11 and the starboard side column 12 of the floating body main body 10. Further, 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 pulling machine 40 and the direction change winch 50 are attached to the floating body main body 10. Each chain winch 41 has its chain pulling direction oriented in the chain pulling direction of each chain sheave 20B, and is fixed to the decks 111 and 121 by bolts or the like. This work can also be performed in the dock, and the location is not specified.

The pre-rig chain 3A is hung on each chain sheave 20, inserted into each hole 16 and hung on each fair leader 17. The pre-rig chain 3A attached to the center column 13 is adjusted in advance to the final length after tension introduction, and is locked to the center column 13 by the chain stopper 30. In addition, among the prerig chains 3A hooked on the chain sheave 20B installed on the port side column 11 and the starboard side column 12, the chain pulled first in the field waters is connected to each pulling machine 40 and pulled immediately in the waters. Being put in the
The wind turbine generator 2 is installed on the deck 131 of the center column 13.
The puller 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 star board side column 12, respectively. Specifically, the puller 40 and the direction change winch 50 are lifted by the work ship 7 such as a crane ship and lowered onto the decks 111 and 121 and arranged on the decks 111 and 121 by bolting as described above. It is fixed.
In the decks 111 and 121, a generator and the like are also installed.

The floating body temporary mooring process is as follows.
The floating body 1 prepared in the floating body preparation step is towed to the site sea area where the anchor, the chain 3 and the temporary mooring cords 4 are laid by the dredger, and as shown in FIG. Place the distance at an initial position spaced apart.
Next, the temporary mooring cord 4A is pulled up by the work boat and connected to the starboard side column 12. Further, the temporary mooring cord 4B is pulled up by the work boat and connected to the port side column 11. Such temporary mooring cords 4A and 4B are crossed and stretched as shown in FIG. The lower hulls 14A and 14B of the floating body 1 are connected to the work boat 7 via the connecting cords, and the work boat 7 applies a tensile force in the direction away from the temporary mooring cords 4A and 4B. In the present embodiment, a crane ship is employed as the work ship 7.
Thus, 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 drawn in advance are stretched on the center column 13 of the floating body 10. Specifically, before connecting the work ship 7 to the floating body 10 by the connection cord,
The first chains 31, 32 are pulled up from the sea bed by the work ship 7, and as shown in FIG. 6, each of the prerig chains 3A attached to the center column 13 in the floating body preparation step Take in the ship 7, connect the two on the work ship 7, and return the connected chain to the sea. Subsequently, as shown in FIG. 7, the connection cords connecting the work vessel 7 and the floating body main body 10 are removed from the floating body main body 10, and the floating body main body 10 is pulled to the mooring planned position X by the dredger. By this pulling, the first chains 31, 32 are pulled and stretched in the normal direction.
The length of the first chains 31 and 32 is adjusted to the length after tension introduction by catenary calculation when a predetermined tension is introduced. In addition, the temporary mooring cords 4A and 4B are removed from the floating body main body 10 before the floating body main body 10 is pulled by the dredger.
In addition, since pulling-up of each chain 33-38 mentioned later and a connection procedure are the same as pulling-up of the 1st chains 31 and 32, and a connection procedure, description is abbreviate | omitted.

Next, the second chain 34 is stretched on the port side column 11. Specifically, the second chain 34 is pulled up from the sea bed by the work boat 7 shown by a solid line in FIG. 8 and connected to the end portion of the prerig chain 3A attached to the port side column 11 taken into the work boat 7. Here, the pre-rig chain 3A to which the second chain 34 is connected is in a state of being stretched over the chain sheave 20B and connected to the pulling machine 40.
After the connection of the second chain 34 to the prerig chain 3A, the connection 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 excess chain pulled up is collected on the work ship 7 after cutting at the upper position of the chain stopper 30.

Next, the third chain 37 is stretched on the starboard side column 12. Specifically, the third chain 37 is pulled up from the sea floor by the work boat 7 shown by a dotted line in FIG. 8 and connected to the end portion of the prerig chain 3A attached to the starboard side column 12 taken into the work boat 7. Here, the pre-rig chain 3A to which the third chain 37 is connected is in a state of being bridged by the chain sheave 20B and being connected to the pulling machine 40.
After connecting the third chain 37 to the prerig chain 3A, the connection is returned to the sea, and then the third chain 37 is wound up by the puller 40 as shown in FIG. Thereby, 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 excess chain pulled up is collected on the work boat 7 after cutting at the upper position of the chain stopper 30. During the recovery, when the cut end of the chain 3 comes in front of the drum of the pulling machine 40, the chain 3 is stopped, and the chain 3 on the side where the chain 3 goes to the work ship 7 is also cut at an appropriate position. 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 random order.

  The floating body 10 is anchored in four directions by the tensioning of the first chains 31, 32, the second chain 34 and the third chain 37. From this state, the third chains 36 and 38 are additionally stretched on the starboard side column 12 as shown in FIG. 10, and the second chains 33 and 35 are added to the port side column 11 as shown in FIG. Stretch.

  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 unfixed by bolts or the like, and the chain winch 41 is made rotatable. Subsequently, the puller 40 is rotated in the rotational direction R by the direction change winch 50 as described above, and the chain pullup direction of the puller 40 is changed from the chain pullup direction of the chain sheave 20B to the chain pullup direction of the chain sheave 20C. . Then, the chain winch 41 is again fixed to the deck 121, and the pre-rigged 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 sea bed by the work boat 7, and the end of the pre-rig chain 3 A hung on the chain sheave 20 C of the starboard side column 12 is also taken onto the work boat 7. Connect both.
After the connection of the third chain 36 to the prerig chain 3A, the connection 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 excess chain pulled up is collected on the work ship 7 after cutting at the upper position of the chain stopper 30. During the recovery, when the cut end of the chain 3 comes in front of the drum of the pulling machine 40, the chain 3 is stopped, and the chain 3 on the side where the chain 3 goes to the work ship 7 is also cut at an appropriate position. It is assumed that the chain 3 remains inside.

  Next, the third chain 38 is stretched on the starboard side column 12. Specifically, first, the fixing of the chain winch 41 and the deck 121 is released, and the chain winch 41 is made rotatable. Subsequently, the puller 40 is reversely rotated in the rotational direction R as described above by the direction change winch 50, and the chain pullup direction of the puller 40 is changed from the chain pullup direction of the chain sheave 20C to the chain pullup direction of the chain sheave 20A. Do. Then, the chain winch 41 is again fixed to the deck 121, and the pre-rigged 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 sea bed by the work boat 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 onto the work boat 7, and Connecting.
After the connection of the third chain 38 to the prerig chain 3A, the connection 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. The excess chain pulled up is recovered at the upper position of the chain stopper 30 on the working ship 7 after cutting.

In the present embodiment, after the third chains 36 and 38 are stretched, the second chains 33 and 35 are stretched.
The extension procedure of the second chain 33 to the port side column 11 is as follows. First, the fixing of the chain winch 41 and the deck 111 by bolts or the like is released, and the chain winch 41 is made rotatable. Subsequently, the puller 40 is rotated in the rotational direction R as described above by the direction change winch 50, and the chain pullup direction of the puller 40 is changed from the chain pullup direction of the chain sheave 20B to the chain pullup direction of the chain sheave 20A. . Then, the chain winch 41 is again fixed to the deck 111, and the pre-rigged 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 ship 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 onto the work ship 7, Connect
After the connection of the second chain 33 to the prerig chain 3A, the connection is returned to the sea and the second chain 33 is wound up by the puller 40. Thereby, 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 excess chain pulled up is collected on the work ship 7 after cutting at the upper position of the chain stopper 30. During the recovery, when the cut end of the chain 3 comes in front of the drum of the pulling machine 40, the chain 3 is stopped, and the chain 3 on the side where the chain 3 goes to the work ship 7 is also cut at an appropriate position. It is assumed that the chain 3 remains inside.

  Next, the second chain 35 is stretched on the port side column 11. Specifically, first, the chain winch 41 and the deck 111 are unlocked, and the chain winch 41 is made rotatable. Subsequently, the puller 40 is reversely rotated in the rotational direction R as described above by the direction change winch 50, and the chain pullup direction of the puller 40 is changed from the chain pullup direction of the chain sheave 20A to the chain pullup direction of the chain sheave 20C. Do. Then, the chain winch 41 is again fixed to the deck 111, and the pre-rigged 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 ship 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 onto the work ship 7, Connect
After the connection of the second chain 35 to the prerig chain 3A, the connection 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. The excess chain pulled up is recovered at the upper position of the chain stopper 30 on the working ship 7 after cutting.

Here, the conventional chain pulling-up work is performed by the work boat 7 that is more susceptible to shaking than the floating body main body 10 in the open sea (outside of the harbor) that performs offshore wind power. For this reason, the weather and sea conditions that allow the chain pulling operation by the work ship 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 pulling operation of the second chain 33 to 35 and the third chain 36 to 38 described above is performed by the pulling machine 40 installed on the floating body main body 10 less susceptible to the influence of the sea than the work boat 7 . For this reason, the sea condition which can perform the chain pulling operation can be relaxed, for example, to 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 the equipment on the deck 111 is as follows. The pulling machine 40 is released from being fixed to the deck 111 by bolt extraction or the like. Subsequently, as shown in FIG. 12, the puller 40 is lifted by the work boat 7 and removed from the deck 111.
In addition, the direction change winch 50 is also unlocked from the deck 111, lifted by the work boat 7 and removed from the deck 111.
Although not shown, a generator installed on the deck 111 is also removed.

The removal of the puller 40, the direction change winch 50, the generator and the like on the deck 121 is performed in the same manner as the removal of the puller 40, the direction change winch 50, and the generator and the like on the deck 111, and thus the detailed description is omitted.
As described above, the floating body 1 is moored on the sea.

[Effect of this embodiment]
(1) In the present embodiment, the floating body 1 is connected to the floating body main body 10 on which the wind turbine generator 2 is installed, the chain sheave 20 installed on the floating body main body 10, and the chain 3 hooked on the chain sheave 20 The pull-up machine 40 is characterized in that it is removably mounted on the decks 111 and 121 of the floating body 10.
With the above configuration, first, one end of the chain 3 is disposed on the seabed, and the other end of the chain 3 is bridged in advance to the chain sheave 20 of the floating body 1 at a place not affected by sea conditions such as a dock or a quay. The pull machine 40 is connected to the pull machine 40, and the chain 3 is pulled up by the pull machine 40 to adjust the tension of the chain 3. After adjusting the chain tension, the pull machine 40 is removed from the decks 111 and 121 of the floating body 10 The floating body 1 can be moored on the sea.
By mooring the floating body 1 on the ocean in this manner, the chain 3 can be pulled up by the pulling machine 40 mounted on the decks 111 and 121 of the floating body main body 10 that is less affected by the sea appearance than the general purpose work boat 7. For this reason, compared with the case where the chain 3 is pulled up using the general-purpose work ship 7, the restriction of the sea condition can be eased, the number of days when the sea condition is not satisfied can be reduced, and the prolongation of the mooring operation can be suppressed. it can.
In addition, since it is not necessary to use a special work boat for controlling the attitude of the ship, it is not necessary to arrange the special work boat for time and effort, and it is possible to suppress the cost increase due to the use of the special work boat. .
Furthermore, after pulling up the chain 3 to adjust the tension, removing the pulling machine 40 which is a power machine from the decks 111 and 121 of the floating body main body 10 saves time for inspection and maintenance of the pulling machine 40 on the ocean. it can.
Furthermore, in the present embodiment, the following effects can be exhibited.

(2) The pulling machine 40 includes a chain winch 41 and a rotating mount 42. The rotating mount 42 is installed between the chain winch 41 and the deck 111 (deck 121) of the floating body 10, and the chain sheave 20 Are arranged around the puller 40. Therefore, by rotating the chain winch 41 by the rotating stand 42, the pulling direction of the chain 3 by the pulling machine 40 can be changed. For this reason, the chains 3 hooked on the plurality of chain sheaves 20 (20A, 20B, 20C) disposed around the puller 40 can be pulled up respectively. Thus, 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 narrow.

(3) The floating body 1 includes the chain stopper 30 installed on the floating body main body 10. Therefore, after pulling up the chain 3 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 by fixing the chain 3 to the floating body main body 10 by the chain stopper 30, The connection with the pulling machine 40 can be easily released. For this reason, the removal operation of the pulling machine 40 can be facilitated.

(4) The floating body 10 includes the center column 13 on which the wind turbine 2 is installed, the port side column 11 disposed on the left side of the center column 13, and the starboard side column 12 disposed on the right side of the center column 13. And the lower hull 14 (14A, 14B) connecting the port side column 11, the star board side column 12 and the center column 13, and the chain sheave 20 is installed in the port side column 11 and the star board side column 12, respectively. The puller 40 is removably mounted on the deck 111 of the port side column 11 and the deck 121 of the starboard side column 12 respectively. Therefore, first attach the other end side of the chain 3 adjusted to the length of the chain after tension to the center column 13 in a place not affected by sea conditions such as in a dock or quay, and install it on the seabed in advance. It connects with the end of the chain 3 that has been Next, move the floating body 10 to the mooring plan position X on the ocean, and then hook the other end of the chain 3 on the port side column 11 and the chain sheave 20 of the starboard side column 12 to connect to each pulling machine 40 Adjust the tension by pulling up the chain 3 by each pulling machine 40, and finally fix the chain 3 to the port side column 11 and the starboard side column 12, respectively, and set each pulling machine 40 to the port side column 11 and star The floating body 1 can be moored on the ocean by removing it from the decks 111 and 121 of the board side column 12, respectively.
Thus, the floating body 1 can be moored without attaching the pulling machine 40 to the center column 13, and compared with the case where the pulling machine 40 is attached to the center column 13, the time and effort for removing the pulling machine 40 can be reduced. Can be shortened.

(5) In the present embodiment, a chain sheave 20 installable on the floating body main body 10 in which the wind turbine generator 2 is installed, a chain 3 hung on the chain sheave 20, and a puller 40 connected to the chain 3 The pulling machine 40 can configure a floating body mooring device configured to be attachable to and removable from the deck 111 (deck 121) of the floating body main body 10. According to this floating body mooring apparatus, the same function and effect as the floating body 1 described above can be exhibited.

[Modification]
The present invention is not limited to the configurations described in the above embodiments, and modifications within the scope in which the object of the present invention can be achieved are included in the present invention.
For example, in the embodiment, although the pulling machine 40 is attached to the deck 111 of the port side column 11 and the deck 121 of the star board side column 12 respectively, the invention is not limited thereto. It 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. For example, the deck 131 is provided with the mounting space, and the deck 131 is provided with a pulling machine. You may wear 40. In this case, the puller 40 may not be attached to one or both of the decks 111 and 121.

  In the embodiment, a plurality of chain sheaves 20 (20A, 20B, 20C) are arranged around one puller 40, but the invention is not limited thereto. For example, only one chain sheave 20 may be a puller 40. It may be arranged around. In this case, since the pulling machine 40 does not need to change the chain pulling direction, the configuration of the rotating rack 42 may be omitted. Also, in this case, the direction change winch 50 may be omitted.

  In the above embodiment, one puller 40 is shared for the chain sheaves 20A, 20B, 20C, but the invention is not limited thereto. For example, the small number of pulls corresponding to each of the chain sheaves 20A, 20B, 20C You may install a machine.

  In the said embodiment, although the floating body main body 10 is formed in planar view substantially V shape, it is not limited to this shape, Even if it is planar view Y shape and planar view polygonal shape (planar view octagonal shape) etc. Good.

  In the embodiment, the chain stopper 30 is constituted by the half bodies 301 and 302 which can be fitted into the holes 16. However, the chain stopper 30 may have any shape as long as the chain 3 can be locked, and the invention is not limited thereto.

In the 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 present invention is not limited to this, and the order of extension can be appropriately changed in consideration of the site situation (the situation such as the direction of the wind or the wave), the movement of the work boat 7, and the like.
For example, the third chain 37 may be stretched before the second chain 34. In this case, the second chains 33, 35 may be stretched before the third chains 36, 38. Good.
In addition, the order of extension of the second chains 33 to 35 and the order of extension of the third chains 36 to 38 can be appropriately changed in consideration of the site situation, the movement of the work boat 7, and the like.

  In the said embodiment, although the chain sheave 20 is made into a temporary mooring guide, it is not restricted to this, For example, you may make a sliding guide into a temporary mooring guide.

  In the said embodiment, although the floating body main body 10 is temporarily moored by the temporary mooring cords 4, when it is not restricted to this and the floating body main body 10 can be positioned to an initial position by a tugboat, it does not temporary mooring using a temporary mooring cord It is also good.

  In the above embodiment, a crane ship is employed as the work ship 7, but the invention is not limited thereto. The work ship 7 may be a work ship provided with a winch or the like for lifting the chain 3 without including a crane. In this case, in the equipment removal process, a crane ship is used to lift and remove the puller 40 separately from the work ship.

  In the said embodiment, although the wind power generator 2 is installed as an offshore structure in the floating body 1, it is not limited to this, and it is good if it is an offshore structure which does not require change of the mooring position after mooring once. For example, a substation connected to the wind turbine 2 by a cable or the like may be installed.

  DESCRIPTION OF SYMBOLS 1 floating body 10 floating body main body 11 port side column (port left column) 111 121 1, 131 deck 12 starboard side column (right star column) 13 center column (installation column) 14 (14 A , 14 B) ... lower hull, 15 ... side deck, 16 ... hole 17 ... fair leader, 2 ... wind power generator (offshore structure), 20 (20A, 20B, 20C) ... chain sheave (mooring guide), 3 (3 3A, 31 to 38) ... chain (mooring cord), 30 ... chain stopper (mooring cord stopper), 301, 302 ... half body, 4 (4A, 4B) ... temporary mooring cord, 40 ... pulling machine, 41 ... chain Winch (puller main body), 42: rotation mount, 50: change direction winch, 51: wire, 7: work ship, 8: quay, R: rotation direction, X: mooring plan Location.

Claims (7)

A floating body on which offshore structures are installed;
A mooring guide installed on the floating body;
And a pulling machine connected to the mooring cord hung on the mooring cord guide,
The floating body, wherein the pulling machine is removably attached to the deck of the floating body. In the floating body according to claim 1,
The pulling machine comprises a pulling machine main body and a rotating stand,
Between the pulling machine body and the deck of the floating body, a rotating stand is installed,
A plurality of the mooring cord guides are disposed around the puller. In the floating body according to claim 1 or 2,
The floating body includes an installation column on which the offshore structure is installed, a port column arranged on the port of the installation column, a starboard column arranged on the starboard of the installation column, the port column, and the starboard column And a lower hull connecting the installation column,
The mooring guide is installed on the port column and the starboard column respectively.
The floating body, wherein the pulling machine is removably mounted on the deck of the port column and the deck of the starboard column. Mooring guide that can be installed on the floating body body where offshore structure is installed;
A mooring cord hung on the mooring cord guide;
And a pulling machine connected to the mooring line,
The floating body mooring device, wherein the pulling machine is configured to be attachable to and removable from the deck of the floating body main body. In the floating body mooring apparatus according to claim 4,
The pulling machine comprises a pulling machine main body and a rotating stand,
Between the pulling machine body and the deck of the floating body, a rotating stand is installed,
A floating body mooring apparatus characterized in that the mooring cord guide is constituted by a plurality of mooring cord guides arranged around the puller. The floating body body on which the offshore structure is installed, the mooring cord guide installed on the floating body body, and the pulling machine connected to the mooring cord hung on the mooring cord guide, the pulling machine comprising the floating body body A floating body mooring method for mooring a floating body removably attached to a deck of
Place one end of the mooring line on the seabed,
The other end side of the mooring cord is stretched over the mooring cord guide and connected to the pulling machine;
Pulling up the mooring cord by the pulling machine to adjust the tension of the mooring cord;
A floating body mooring method characterized by removing the pulling machine from the deck of the floating body main body after tension adjustment. In the floating body mooring method according to claim 6,
The floating body main body of the floating body includes an installation column on which the offshore structure is installed, a port column arranged on the port of the installation column, a starboard column arranged on the right side of the installation column, the port column, the port The lower rowh connecting the starboard column and the installation column, the mooring guide is installed on the port column and the starboard column respectively, and the pulling machine is respectively installed on the deck of the port column and the deck of the starboard column It is removably mounted,
The moorings arranged on the seabed are constituted by temporary moorings, first moorings, second moorings and third moorings,
Securing the first mooring line to the installation column;
The temporary mooring cord is towed by a dredger, and while the first mooring cord is stretched, the floating body main body is disposed at a mooring planned position,
After placement of the floating body, the first mooring cord is stretched over the mooring cord guide in one of the port column and the starboard column and connected to the puller, and the pullup machine is used to connect the first mooring cord Pull up,
After placement of the floating body, the second mooring cord is stretched over the mooring cord guide at the other of the port and column, and connected to the puller and the second mooring cord is moved by the puller. A floating body mooring method characterized by pulling up.

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