JP5565803B2 - Installation method of tension mooring floating structure and ship for installation of tension mooring floating structure - Google Patents

Description

  The present invention relates to a method for installing a tension mooring floating structure on water or the like and a ship for such installation.

  Offshore waters are very suitable for wind power generation because they have better wind conditions than land and shallow waters. The wind power generation facility installed on the ocean is said to be more advantageous to the floating structure type than the well-established bottomed type from the viewpoint of economy and the like. Wind power generation facilities must maintain sufficient stability against large horizontal forces and tipping moments that act as blades rotate during power generation, and must minimize the amount of rocking of the floating body so that power generation efficiency does not decrease. Measures are required.

  There is a tension leg type as a floating wind power generation facility installed on the ocean. The tension leg type generates initial tension in the vertical direction of the mooring member by buoyancy caused by submerging part of the floating structure in free floating state in water against the buoyancy, and the mooring member is always pulled by the initial tension. The floating structure is moored on the water by setting it to a tension state with an axial force of.

  Generally, a floating-type wind power generation facility using a tension leg type includes a floating structure that supports a windmill, a tendon that anchors the floating structure, and a large anchor (see, for example, Patent Document 1). . Tension leg type floating wind power generation facilities are moored with a large initial tension applied to the floating body and anchors in the vertical direction in advance, so the amount of floating body can be reduced compared to the loose mooring method. There is an advantage that the occupied area can be relatively small.

  Floating wind power generation facilities installed on the ocean often require huge anchors to reduce the amount of shaking. In addition, since an initial tension in the vertical direction is applied after the anchor is installed, a planar error in the installation position of the anchor and the floating body is not allowed. Therefore, the anchor must be installed with high installation accuracy. However, it tends to be difficult to install a huge anchor with high accuracy using an existing work ship such as a hoist ship.

  As a method for installing a large sinker in a lake or the like where a large carrier such as a large crane is not prepared, for example, a sinker sinking method as disclosed in Patent Document 2 has been proposed. The sinker is set up by supporting the sinker with a rope drawn out from winches mounted on two pontoons facing each other across a large sinker. The strips are drawn out approximately the same length to sink while keeping the sinker in a stable state.

JP 2010-18129 A Japanese Patent Laid-Open No. 05-50980

  Although the above conventional sinker sinking method (Patent Document 2) can accurately install a sinker made up of a huge anchor or the like without using a hoist ship, etc. At the same time, it is very difficult to ensure stable stability when towing, so it is not suitable for offshore applications.

  In addition, this sinker installation method requires a separate facility for work such as connection of the floating body and anchor after installation of the sinker and tension after connection, which requires a long construction period and is not economical. There is a problem, and it is difficult to fix the floating body while maintaining the positional relationship between the floating body and the anchor.

  In view of the problems of the prior art as described above, the present invention anchors a floating structure while maintaining the positional relationship between the floating structure and the anchor, and ensures stability of agitation even for a relatively large floating structure. It is an object of the present invention to provide a tension mooring floating structure installation method that can move to an installation water area and that can position a floating structure with high positional accuracy, and a ship for such installation.

The installation method of the tension mooring floating structure for achieving the above purpose is as follows:
By using a floating structure installed on or under water, an anchor installed on the bottom of the water, and a tension mooring line disposed between the floating structure and the anchor, the buoyancy of the floating structure A method of mooring and installing the floating structure by applying tension to the tension mooring line,
Prepare a dedicated ship for the installation of the floating structure,
The dedicated ship has a first mooring means for mooring the floating structure connected to the stern side using the tension mooring line, and a second mooring means for mooring while holding the anchor. Prepared,
While maintaining the floating structure and the anchor and the positional relationship apart in the traveling direction of the dedicated ships to be moored to the stern side, the dedicated ship engaged distillate vital the said floating structure by said first anchoring means the dedicated ships anchor by said second anchoring means while distillate engaged in the dedicated ship moved to build position of the floating structure,
The anchor is installed on the bottom of the water while being suspended by an anchor suspension line by the second mooring means,
The tension mooring line is installed by the first mooring means between the floating structure and the anchor installed at the bottom of the water,
A predetermined tension is applied to the tension mooring line by adjusting the buoyancy of the floating structure and / or winding / rewinding the tension mooring line.
Features.

  According to this installation method of the tension mooring floating structure, the floating structure can be moored by being connected to the exclusive ship using the tension mooring line by the first mooring means, so that the positional relationship between the floating structure and the anchor is maintained. In addition, the anchor can be moored while being held on a dedicated ship by the second mooring means. In such a moored state, even a relatively large floating structure can be secured on the water to the construction position of the floating structure while securing stability even with a relatively large floating structure. The anchor can be installed on the bottom of the water by the second mooring means, and the tension mooring line can be installed by the first mooring means between the floating structure and the anchor installed on the bottom of the water, and the buoyancy adjustment and / or tension mooring of the floating structure can be performed. The floating structure can be moored at a target position by applying a predetermined tension to the tension mooring line by adjusting the winding and unwinding of the rope. In this way, the floating structure can be installed with high positional accuracy.

  In the installation method of the tension mooring floating structure, the first mooring means includes a tension mooring cable winch, and performs the connection and mooring by winding and unwinding the tension mooring cable with the tension mooring cable winch. It is preferable that the tension can be adjusted.

  The second mooring means includes an anchor winch provided on the dedicated ship corresponding to the anchor and capable of winding and unwinding the anchor suspension rope, and a predetermined height provided on the dedicated ship. It is preferable that the anchor suspension cable extends from the anchor winch to the anchor through an upper portion of the casing. By providing the frame, the distance from the anchor winch to, for example, the first sheave at the top of the frame can be secured, and the fleet angle is reduced, so that the anchor suspension rope is wound around the anchor winch. It is wound neatly without becoming.

  In addition, the floating structure, the anchor, and the tension mooring line are arranged at predetermined positions in a dry dock, and then water is poured into the dock, and then the dedicated ship is drawn in. The floating structure and the anchor And the tension mooring line are moored in the dedicated ship, and then the special ship can be moved to the construction position. In addition, when arrange | positioning in this dry dock, it is preferable to connect a tension mooring line to a floating structure.

  It is preferable that offshore facilities such as wind power generation equipment are integrally mounted on the floating structure.

  The dedicated ship will tow all the offshore facilities to be installed (including floating structures, anchors, and tension mooring lines) to the offshore destination at once, for on-site installation, tendon adjustment, facility inspection, It is preferable to have a structure that can serve all roles related to construction and maintenance such as repair. It is preferable to configure a dedicated ship so that offshore facilities can be installed together.

A ship for installation of tension mooring floating structures to achieve the above purpose
By using a floating structure installed on or under water, an anchor installed on the bottom of the water, and a tension mooring line disposed between the floating structure and the anchor, the buoyancy of the floating structure A ship used when mooring and installing the floating structure by applying tension to the tension mooring line,
First mooring means for mooring the floating structure connected to the stern side using the tension mooring line; and second mooring means for mooring while holding the anchor;
While maintaining the positional relationship and the floating structure and the anchor is anchored to the stern side is separated in the traveling direction of the ship, said I Ri engaging clasp vital said anchor to said first anchoring means the floating structure the It is capable of moving the water in the state Ri that engagement distillate was by the 2 anchoring means,
The anchor is installed on the bottom of the water while being suspended by an anchor suspension line by the second mooring means,
The tension mooring line is installed by the first mooring means between the floating structure and the anchor installed at the bottom of the water,
A predetermined tension can be applied to the tension mooring line by adjusting the buoyancy of the floating structure and / or winding / rewinding the tension mooring line.

  According to the tension mooring floating structure installation ship, the floating structure can be connected and moored by the first mooring means using the tension mooring line, so that the positional relationship between the floating structure and the anchor can be maintained. In addition, the anchor can be held and held by the second mooring means. Even in a moored state, even a relatively large floating structure can be moved on the water up to the construction position of the floating structure while ensuring stability of shaking. The anchor can be installed on the bottom of the water by the second mooring means, and the tension mooring line can be installed by the first mooring means between the floating structure and the anchor installed on the bottom of the water, thereby adjusting the buoyancy of the floating structure. The floating structure can be moored at the target position by applying a predetermined tension to the tension mooring line by winding and unwinding the tension mooring line. In this way, the floating structure can be installed with high positional accuracy.

  In the installation ship for the tension mooring floating structure, the first mooring means preferably includes a tension mooring line winch capable of winding and unwinding the tension mooring line.

  The second mooring means includes an anchor winch provided on the dedicated ship corresponding to the anchor and capable of winding and unwinding the anchor suspension rope, and a predetermined height provided on the dedicated ship. It is preferable that the anchor suspension cable extends from the anchor winch to the anchor through an upper portion of the casing. By providing the frame, the distance from the anchor winch to, for example, the first sheave at the top of the frame can be secured, and the fleet angle is reduced, so that the anchor suspension rope is wound around the anchor winch. It is wound neatly without becoming.

  In addition, it is preferable that the installation ship for the tension mooring floating structure can transport the installation object such as offshore facilities, the floating structure, the anchor, and the tension mooring line in a lump. Moreover, it is preferable to be able to perform field installation work only with a ship.

  According to the installation method of the tension mooring floating structure of the present invention and the ship for such installation, the floating structure is moored while maintaining the positional relationship between the floating structure and the anchor and is a relatively large floating structure. Even if stability is ensured, it can move to the installation water area and the floating structure can be installed with high positional accuracy.

It is a side view which shows roughly the wind power generation facility by 1st Embodiment, and the exclusive ship used for the water installation. It is a top view of the wind power generation facility and exclusive ship of FIG. It is a perspective view which shows roughly the anchor for installation of the wind power generation facility of FIG. 1, FIG. 3 is a flowchart for explaining steps S01 to S06 until the anchor, the floating structure, and the windmill body are moored on the exclusive ship of FIGS. 1 and 2 and towed by the exclusive ship in the first embodiment. It is a side view which shows the process of arrange | positioning the floating body structure which mounts the windmill main body of FIG. 1, FIG. 2, and the anchor of FIG. 3 to a dry dock. FIG. 6 is a side view showing a state where a dedicated ship is drawn into the water-filled dry dock of FIG. 5. It is a side view for demonstrating the lifting process of an anchor and the winding process of a tendon with the exclusive ship of FIG. It is a side view which shows the process of incorporating an anchor in the exclusive ship of FIG. 7, mooring a floating body structure and a windmill main body, and towing to a destination. It is a flowchart for demonstrating process S11-S18 until it installs a wind power generation facility in the installation position on the ocean in 1st Embodiment. It is a side view which shows the state which hangs an anchor underwater from the exclusive ship of FIG. 8, and pays out a tendon. It is a side view which shows the process of cut | disconnecting the anchor of FIG. It is a side view which shows the process of winding in tendon from the state of FIG. It is a side view which shows the process of the upper process of a tendon from the state of FIG. It is a side view which shows the process of floating a floating body structure from the state of FIG. It is a side view which shows the state which installed the wind power generation facility on the sea. It is a perspective view which shows roughly the tension mooring type offshore platform which is the installation target object in 2nd Embodiment. It is a side view of the exclusive ship for the offshore installation of the tension mooring type offshore platform of FIG. It is a top view of the exclusive ship of FIG. It is a figure for demonstrating the modification of 1st Embodiment, and is a top view of a wind power generation facility and an exclusive ship.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  <First Embodiment>

  FIG. 1 is a side view schematically showing a wind power generation facility according to the first embodiment and a dedicated ship used for installing on the water. FIG. 2 is a plan view of the wind power generation facility and the dedicated ship of FIG. FIG. 3 is a perspective view schematically showing an anchor for installation of the wind power generation facility of FIGS.

  As shown in FIGS. 1 and 2, the wind power generation facility includes a windmill main body 11, a floating structure 12 on which the windmill main body 11 is mounted, a tension mooring line (tendon) 14, and an anchor 15 installed on the bottom of the water. It is a tension leg type and is installed at a predetermined position on the ocean.

  The windmill body 11 includes a windmill 11a composed of a plurality of blades, a rotating shaft 11b that supports the windmill 11a, and a support column 11c that supports the rotating shaft 11b at the top, and further includes a power generation device, a power storage device, and a power transmission device. (Not shown). The column 11c has a lower cylindrical portion 11d having a large diameter at its lower portion.

  The floating structure 12 includes a plurality of floating bodies (side columns) 12a, 12b, and 12c disposed around the lower cylindrical portion 11d of the windmill body 11, and connecting members that connect the floating bodies 12a to 12c and the lower cylindrical portion 11d. 13 a, 13 b, and 13 c, and floats on the water surface S while supporting the wind turbine body 11. A plurality of connection reinforcing members 13d are further arranged between the floating bodies 12a to 12c and the lower cylindrical portion 11d.

  Each floating body 12a-12c, each connection member 13a-13c, and each connection reinforcement member 13d are arrange | positioned at equal intervals (120 degree | times) around the lower cylinder part 11d like FIG.

  1 and 2 is a trolley having a trapezoidal hull used for the installation on the surface of a tension leg type wind power generation facility, and includes a windmill body 11, a floating structure 12, a tension mooring line (tendon). 14 and all of the tension-leg wind power generation facilities such as anchor 15 installed at the bottom of the water are towed to the offshore destination at once, installation, adjustment of the tendon, and other inspection and repair of the facility. And it has a structure that can serve all the roles related to maintenance.

  In this embodiment, as shown in FIGS. 1 and 2, the dedicated ship 10 has a planar shape corresponding to the floating structure 12 on which the windmill main body 11 is mounted, and at least a part of the floating structure 12 enters into the floating structure. It has a mooring structure in which the object 12 can be moored.

  That is, as shown in FIG. 2, the dedicated ship 10 has, on the stern side, an elongated groove-like cut portion 17 into which the connecting member 13 c of the floating structure 12 on which the windmill body 11 is mounted and the floating body 12 c can enter, and another connection It has a wall-like portion 18 that is substantially parallel to the member 13a and the floating body 12a, and a wall-like portion 19 that is substantially parallel to another connecting member 13b and the floating body 12b. Further, the lower cylindrical portion 11 d of the windmill body 11 is located in the vicinity of the opening of the groove-shaped cut portion 17 and the inner ends of the wall-like portions 18 and 19. The dedicated ship 10 has projecting portions 10a and 10b so as to partially surround the floating bodies 12a and 12b on both end sides of the wall-shaped portions 18 and 19.

  The dedicated ship 10 is equipped with a plurality of tendon winches 24 that can wind up and unwind the tendon 14 corresponding to the floating bodies 12a, 12b, and 12c of the floating structure 12. Moreover, the work crane 21 for performing various operations is mounted.

  The tendon 14 is for tensioning and mooring the floating structure 12 by applying a predetermined tension between the floating structure 12 and the anchor 15. In the present embodiment, the tendon 14 is used during transportation by the dedicated ship 10. It is also used to connect and moor the objects 12.

  2 and 3, the anchor 15 has a substantially triangular planar structure, and has circular anchor portions 15a, 15b, and 15c corresponding to the floating bodies 12a, 12b, and 12c of the floating structure 12. The circular anchor portions 15a to 15c are connected by connecting portions 16a, 16b, and 16c, are located at the vertices of the substantially triangular planar structure, and are main components of the anchor 15.

  An annular connection portion 16d for connecting the wire rope 25a and the tendon 14 is provided on each upper surface of the circular anchor portions 15a to 15c. The anchor 15 can be constituted by a concrete structure in which, for example, an annular connecting portion 16d is embedded. In addition, you may provide the annular connection part 16d of the anchor 15 separately for the connection with the wire rope 25a and the connection with the tendon 14, respectively.

  As shown in FIGS. 1 and 2, the dedicated ship 10 has a space 10 c that can accommodate the anchor 15 on the ship bottom side. The dedicated ship 10 is equipped with a plurality of anchor rods 22, and a plurality of anchor winches 25 capable of lifting and suspending the anchor 15 are mounted below or near each anchor rod 22. Has been.

  The anchor anchors 22 are installed at positions corresponding to the circular anchor portions 15a to 15c of the anchor 15 accommodated in the space 10c on the ship bottom.

  A wire rope 25a from the anchor winch 25 extends downward through the carriage from the lower part of the anchor 22 through the anchor upper sheave 22a provided at the upper part of the anchor anchor 22, and a connecting mechanism 25b is attached to the tip. Has been. The wire rope 25a is connected to the annular connecting portion 16d at the upper part of each circular anchor portion 15a to 15c of the anchor 15 via the connecting mechanism 25b, so that the anchor 15 can be held and the anchor 15 can be lifted and hung. ing.

  As described above, by installing the anchor rod 22, the distance between the anchor winch 25 and the rod upper sheave 22 a can be sufficiently secured, and the fleet angle can be reduced. By reducing the fleet angle, the wire rope 25a can be neatly wound around the winch 25 without being irregularly wound.

  The connection mechanism 25b has an automatic disconnection mechanism (not shown) controlled by a hydraulic cylinder or the like, and can perform the disconnection operation between the wire rope 25a side and the anchor 15 side by remote control from the dedicated ship 10. . Such an automatic detaching mechanism can be constituted by, for example, an apparatus described in Japanese Patent Publication No. 4078664.

  Further, the tendon 14 extends from the winch 24 for tendons through the floating bodies 12a to 12c to the connection portions 16d of the circular anchor portions 15a to 15c of the anchor 15. In the dedicated ship 10, each floating body 12a-12c and each circular anchor part 15a-15c can be connected using the tendon 14 while maintaining the positional relationship between the anchor 15 and the floating bodies 12a-12c of the floating structure 12. It has become. Thereby, the anchor 15 and the floating body structure 12 after water bottom installation become a predetermined positional relationship like FIGS. 12-15 mentioned later.

  As described above, the dedicated ship 10 connects the floating structure 12 on which the windmill body 11 is mounted by means of mooring means using the tendon 14 to moor it on the water surface S and holds the anchor 15 in the space 10c. In the state, it can be navigated by the dredger P and can move to the target water area.

  Note that the floating structure 12 may sail as a mooring means for the floating structure, if necessary, using a separate winch or mooring rope (not shown) and attracted to the dedicated ship 10 side. . In this case, as shown in FIG. 2, the dedicated ship 10 has a structure in which the connecting member 13 c of the floating structure 12 and the floating body 12 c enter the groove-shaped cut portion 17. It is easy to connect 12.

  The anchor 15 can be installed on the bottom of the water with high accuracy using a wire facility such as a winch 25 using a crane 21 or a dredger 22 mounted on the dedicated ship 10.

  Regarding the tension of the tendon 14 after the anchor 15 is installed on the bottom of the water, a predetermined initial tension is applied to the tendon 14 by tensioning equipment such as a tendon winch 24 mounted on the dedicated ship 10 or ballast adjustment of a floating structure. Can act. In order to adjust the ballast, the floating structure 12 is preferably provided with a ballast tank, a ballast that can be increased or decreased, and the like.

  Next, the construction example which installs a wind power generation facility in the target position on the ocean using the exclusive ship 10 and the anchor 15 of FIGS. 1-3 is demonstrated.

  First, a process until an anchor, a floating structure, and a windmill main body are carried to the destination with a dedicated ship is demonstrated with reference to FIGS.

  FIG. 4 is a flowchart for explaining steps S01 to S06 until the anchor, the floating structure, and the windmill body are moored to the exclusive ship of FIGS. 1 and 2 in the first embodiment and towed by the exclusive ship.

  FIG. 5 is a side view showing a step of placing the floating structure on which the windmill main body of FIGS. 1 and 2 is mounted and the anchor of FIG. 3 on the dry dock. FIG. 6 is a side view showing a state where a dedicated ship is drawn into the water-filled dry dock of FIG. FIG. 7 is a side view for explaining an anchor lifting process and a tendon winding process in the exclusive ship of FIG. FIG. 8 is a side view showing a process of assembling an anchor into the exclusive ship shown in FIG. 7 and mooring the floating structure and the windmill body to tow to the destination.

  As shown in FIG. 5, the anchor 15, the windmill body 11, and the floating structure 12 are assembled at predetermined positions in the dry dock D (S01). The windmill body 11 is mounted on the floating structure 12.

  Thereafter, the tendon 14 is connected in the same manner as in the main installation (S02). That is, the end portion of the tendon 14 is connected to the connection portion 16d of the anchor 15, and the other end portion is passed from the lower part to the upper part of the floating bodies 12a to 12c.

  Next, as shown in FIG. 6, seawater is poured into the dry dock D (S03), and then the dedicated ship 10 is drawn into the dock D (S04). As a result, as shown in FIG. 2, the connecting member 13c and the floating body 12c of the floating body structure 12 on which the windmill body 11 is mounted enter the groove-shaped cut portion 17 of the dedicated ship 10, and another connecting member 13a and the floating body 12a. Approaches the substantially parallel to the wall-shaped portion 18 of the dedicated ship 10, and another connecting member 13 b and the floating body 12 b approach the substantially parallel to the wall-shaped portion 19.

  Moreover, the wire rope 25a is connected to the connection part 16d (FIG. 3) of the anchor 15 by the connection mechanism 25b provided at the tip of the wire rope 25a.

  Next, as shown in FIG. 7, the anchor 15 is lifted by the anchor winch 25 and the end portion of the tendon 14 is wound around the tendon winch 24. As a result, the anchor 15 is held and moored in the space 10c on the bottom side of the dedicated ship 10, and the floating structure 12 carrying the windmill body 11 is moored to the dedicated ship 10 by entraining the tendon 14 (S05). .

  Next, as shown in FIG. 8, the dedicated ship 10 leaves the dock D by the dredger P while mooring the floating structure 12 on which the windmill body 11 is mounted and holding the anchor 15 in the space 10c. Sail to the installation position (S06).

  As described above, the floating structure 12 on which the windmill body 11 is mounted in the dedicated ship 10 is moored by the mooring structure and mooring means, and the anchor ship 15 is held and moored while the dedicated ship 10 is sailed by the dredger P. It can be transported to the target water area.

  Next, a process until the wind power generation facility transported to the destination by the dedicated ship is installed at the installation position will be described with reference to FIGS.

  FIG. 9 is a flowchart for explaining steps S11 to S18 until the wind power generation facility is installed at the offshore installation position in the first embodiment.

  FIG. 10 is a side view showing a state in which the anchor is suspended from the exclusive ship of FIG. FIG. 11 is a side view showing a step of detaching the anchor of FIG. FIG. 12 is a side view showing a process of winding tendon from the state of FIG. FIG. 13 is a side view showing a process of upper processing of tendon from the state of FIG. FIG. 14 is a side view showing a step of floating the floating structure from the state of FIG. FIG. 15 is a side view showing a state where a wind power generation facility is installed on the ocean.

  As shown in FIG. 10, the anchor 15 is suspended in the water by the wire rope 25a through the upper sheave 22a of the anchor rod 22 by the anchor winch 25 of the dedicated ship 10 at the installation position of the wind power generation facility, and almost simultaneously with this. The tendon 14 is fed out by the tendon winch 24 (S11). Accordingly, the anchor 15 and the tendon 14 whose lower end is connected to the anchor 15 descends in water. In this way, the anchor 15 is landed on the water bottom G (S12).

  Next, as shown in FIG. 11, after the anchor 15 reaches the bottom G, the connection mechanism 25b attached to the tip of the wire rope 25a is remotely controlled on the dedicated ship 10 to automatically move the anchor 15 from the wire rope 25a. The wire rope 25a and the connection mechanism 25b, which have been separated and freed, are collected by being wound up by the anchor winch 25 (S13).

  Next, as shown in FIG. 12, the tendon 14 is wound up by the tendon winch 24 (S14).

  Next, after the above-mentioned tendon 14 is rolled in, as shown in FIG. 13, the upper portion 14a of the tendon 14 is fixed to the floating bodies 12a to 12c by the work crane 21 (S15). At this time, the tendon 14b for tendon is also removed.

  Next, as shown in FIG. 14, the wind turbine body 11 and the floating structure 12 are floated by ballast adjustment, thereby applying a predetermined tension to the tendon 14 (S <b> 16). In this case, when the tendon 14 is wound by the tendon winch 24 in step S14, the tension can be adjusted by adjusting the tendon 14 for winding and rewinding.

  Next, the exclusive ship 10 of FIG. 14 is moved from the installation position of the windmill main body 11 and the floating structure 12 by the dredger P (S17). Thereby, as shown in FIG. 15, the installation of the wind power generation facility including the windmill body 11 and the floating structure 12 is completed (S18).

  As described above, according to the present embodiment, the floating structure 12 on which the windmill body 11 is mounted is used with the tendon winch 24 using the tendon 14 while maintaining the positional relationship between the floating structure 12 and the anchor 15. It can be connected to 10 stern sides and moored. Further, the anchor 15 can be held and moored on the ship bottom side by winding the wire rope 25a by the anchor winch 25. By setting the mooring state in this manner, it is possible to ensure stable stability and to move the floating structure 12 to the construction position by the dedicated ship 10.

  Further, the anchor 15 can be hung by unwinding the wire rope 25a by the anchor winch 25 and installed on the bottom of the water, and at the same time, the tendon 14 is unwound by the tendon winch 24, so that the floating structure 12 and the bottom of the water are removed. The tendon 14 can be installed between the anchor 15 installed. The floating structure 12 can be moored at a target position by applying a predetermined tension to the tendon 14 by adjusting the buoyancy of the floating structure 12 and / or adjusting the winding / rewinding of the tendon 14. In this way, the wind power generation facility composed of the windmill body 11 and the floating structure 12 can be accurately installed.

  Next, a modification of the present embodiment will be described with reference to FIG. 19 is provided with a flat wall-shaped portion 30a on the stern side, and the floating structure in which the windmill body 11 is mounted so that the floating bodies 12b and 12c of the floating structure 12 hit the wall-shaped portion 30a. 12 is moored by tendons 14 extending from a plurality of tendon winches 24. Each tendon winch 24 is appropriately arranged on the dedicated ship 10. Moreover, you may use the winch and mooring rope which are not shown in figure as a mooring means of the floating structure 12 as needed.

  19, the floating structure 12 on which the windmill body 11 is mounted can be moored without providing the stern-side groove-like cutout 17 or the like as in the dedicated ship 10 of FIG. . 4 and 9, the dedicated ship 30 can navigate to the installation position while mooring the floating structure 12, and can install the floating structure 12 on which the windmill body 11 is mounted.

  <Second Embodiment>

  In the second embodiment, the installation object is a tension mooring type offshore platform (Tension Leg Platform / TLP).

  FIG. 16 is a perspective view schematically showing a tension mooring type offshore platform which is an installation object in the second embodiment. FIG. 17 is a side view of a dedicated ship for offshore installation of the tension mooring type offshore platform of FIG. FIG. 18 is a plan view of the dedicated ship of FIG.

  As shown in FIG. 16, the tension mooring type offshore platform (hereinafter abbreviated as “TLP”) 51 mainly includes a floating structure 52, a plurality of tension mooring lines (tendons) 54, and an anchor 55.

  The floating structure 52 includes an upper structure 52a that is a substantially square or substantially rectangular work table, a lower structure 52c that is a floating body, and a plurality of support columns 52b that connect the upper structure 52a and the lower structure 52c. And has a substantially rectangular parallelepiped shape as a whole.

  The anchor 55 includes circular anchor portions 55a, 55b, 55c, and 55d that are arranged at respective vertex positions of a substantially square shape or a substantially rectangular shape, and connecting portions 56a, 56b, 56c, and 56d that connect the circular anchor portions 55a to 55d. . Each upper surface of the circular anchor portions 55a to 55d of the anchor 55 is provided with a connection portion (not shown) for connection with a wire rope and tendon. The floating structure 52 and the anchor 55 can be made of a steel material or a concrete structure.

  A plurality of tendons 54 are arranged between the lower structure 52c and the circular anchor portions 55a to 55d of the anchor 55, and the predetermined tension is applied to the tendons 54 by sinking the lower structure 52c in water against buoyancy. As a result, the TLP 51 is moored offshore.

  17 and 18 is a trolley having a trapezoidal hull used for the installation of the TLP 51 in FIG. 16, and all of the TLP 51 such as the floating structure 52, the tendon 54, the anchor 55 and the like are bundled together. It has a structure that can be towed to offshore destinations and can also perform all the roles related to construction and maintenance, such as on-site installation, tendon adjustment, and other facility inspections and repairs.

  As shown in FIGS. 17 and 18, the dedicated ship 50 has a mooring structure capable of mooring a substantially rectangular floating body structure 52, and on the stern side of the floating structure 52 having a substantially rectangular solid shape. It has a wall-like part 58 substantially parallel to the one surface side.

  The dedicated ship 50 is equipped with a plurality of tendon winches 64 that can wind up and feed out the tendons 54 corresponding to the positions of the tendons 54 of the floating structure 52. In addition, a work crane (not shown) for carrying out various kinds of work is mounted.

  As shown in FIGS. 17 and 18, a plurality of anchor rods 62 are mounted on the dedicated ship 50, and a plurality of anchor winches 65 capable of lifting and hanging the anchor 55 are provided for each anchor rod. It is mounted on the lower part of 62.

  Each anchor rod 62 is installed at a position corresponding to each circular anchor portion 55a to 55d of the anchor 55 located on the ship bottom.

  A wire rope 65a from the anchor winch 65 extends downward from the lower part of the anchor 62 through the carriage through the upper part of the anchor anchor 62, and a connection mechanism 65b is attached to the tip. The wire rope 65a is connected to the upper connection portions (not shown) of the circular anchor portions 55a to 55d of the anchor 55 via the connection mechanism 65b, so that the anchor 55 is held on the ship bottom, and the anchor 55 is lifted and suspended. Is possible.

  As described above, by installing the anchor rod 62, the distance between the anchor winch 65 and the rod upper sheave 62a can be sufficiently secured, and the fleet angle can be reduced. The connection mechanism 65b may have the same configuration as the connection mechanism 25b described above.

  Further, the tendons 54 from the winches 64 for tendons penetrate through the upper structure 52a, the struts 52b, and the lower structure 52c of the floating structure 52, and are connected to the circular anchor portions 55a to 55d of the anchor 55 (not shown). ). In the dedicated ship 50, the floating structure 52 and the circular anchor portions 55a to 55d of the anchor 55 can be connected using the tendon 54 while maintaining the positional relationship between the anchor 55 and the floating structure 52.

  As described above, the dedicated ship 50 can be navigated by the charter ship P while mooring the floating structure 52 to the stern side by the mooring structure and mooring means and holding the anchor 55 on the bottom of the ship. Can be transported. Note that the floating structure 52 may be sailed in a state of being attracted to the dedicated ship 50 by using a separate winch or mooring rope (not shown) as mooring means for the floating structure as necessary. .

  The anchor 55 can be installed on the bottom of the water with high accuracy using a crane (not shown) mounted on the dedicated ship 50, a wire facility such as a winch 65 using a rod 62, and the like.

  Regarding the tension of the tendon 54 after the anchor 55 is installed at the bottom of the water, a predetermined initial tension is applied to the tendon 54 by tensioning equipment such as a tendon winch 64 mounted on the dedicated ship 50 or ballast adjustment of a floating structure. Can act.

  In the present embodiment, the anchor 55 and the floating structure 52 are moored to the dedicated ship 50 of FIGS. 17 and 18 in the same manner as in FIG. To do.

  Next, in the same manner as in FIG. 9, the anchor 55 is installed on the bottom of the water, and the dedicated ship 50 is moved after applying a predetermined tension to the tendon 54.

  As described above, the anchor 55 and the floating structure 52 are moored and moved to the installation position by the dedicated ship 50, the anchor 55 is installed on the bottom of the water, and a predetermined tension is applied to the tendon 54, so that the TLP 51 of FIG. It can be installed accurately at the desired offshore location.

  As described above, the modes for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications can be made within the scope of the technical idea of the present invention. For example, the dedicated ships 10 and 50 are towed by a tugboat, but are not limited to this and may be self-propelled. A thruster (a power device for moving the ship in the lateral direction) may be provided for the purpose of positioning at the installation position.

  3 and FIG. 16 are examples, and the number, shape, etc. of the anchors 15 and 55 are only examples, and it goes without saying that the shape of the circular anchor portion may be rectangular or cubic. Good. As shown in FIGS. 3 and 16, a plurality of anchors may be installed in an integrated state. However, the anchor is not limited to this. For example, one anchor can be installed independently corresponding to each tendon 14. Also good.

  The structure / structure of the floating structure shown in FIGS. 1, 2, and 16 is also an example, and it is needless to say that other structures / structures may be used. Further, the prior arrangement in the dry dock may be performed on a quay or the like.

  The anchor may be separated by a method other than the automatic separation mechanism, or may be a method such as separation by a diver, removal of the wire tail portion, and winding of the wire.

  Further, the space 10c on the ship bottom side that accommodates the anchor 15 of FIGS. 1, 2, and 19 may be omitted, and the anchor 15 may be moored on the ship bottom without providing a space. 17 and 18, the anchor 55 is moored at the bottom of the ship. However, as shown in FIGS. 1 and 2, a space for accommodating the anchor may be provided at the bottom of the ship, and the anchor may be accommodated in the space. . Moreover, when providing the space which accommodates an anchor in ship bottom like FIG. 1, FIG. 2, it is good as a space which accommodates the whole anchor, but it is good also as a space which accommodates not only this but a part of anchor.

DESCRIPTION OF SYMBOLS 10 Special ship 10c Bottom 11 Space 11 Windmill body 11d Lower cylindrical part 12 Floating structure 12a, 12b, 12c Floating body 14 Tendon (tension mooring line)
15 anchor 15a, 15b, 15c circular anchor portion 21 working crane 22 anchor rod 22a anchor upper sheave 24 tendon winch 25 anchor winch 25a wire rope 30 dedicated ship 50 dedicated ship 52 floating structure 52c lower structure 54 tendon ( Tension mooring line)
55 Anchor 55a, 55b, 55c, 55d Circular anchor portion 62 Anchor anchor 62a Anchor upper sheave 64 Tendon winch 65 Anchor winch 65a Wire rope D Drydock G Water bottom P Dredger

Claims (8)

By using a floating structure installed on or under water, an anchor installed on the bottom of the water, and a tension mooring line disposed between the floating structure and the anchor, the buoyancy of the floating structure A method of mooring and installing the floating structure by applying tension to the tension mooring line,
Prepare a dedicated ship for the installation of the floating structure,
The dedicated ship has a first mooring means for mooring the floating structure connected to the stern side using the tension mooring line, and a second mooring means for mooring while holding the anchor. Prepared,
While maintaining the floating structure and the anchor and the positional relationship apart in the traveling direction of the dedicated ships to be moored to the stern side, the dedicated ship engaged distillate vital the said floating structure by said first anchoring means the dedicated ships anchor by said second anchoring means while distillate engaged in the dedicated ship moved to build position of the floating structure,
The anchor is installed on the bottom of the water while being suspended by an anchor suspension line by the second mooring means,
The tension mooring line is installed by the first mooring means between the floating structure and the anchor installed at the bottom of the water,
A tension mooring floating structure installation method, wherein a predetermined tension is applied to the tension mooring line by adjusting buoyancy of the floating structure and / or winding / rewinding adjustment of the tension mooring line.   2. The first mooring means includes a tension mooring line winch, and the tension and mooring line is wound and unwound by the tension mooring line winch to perform the connection and mooring and adjust the tension. The installation method of the tension mooring floating structure described in 2. Said second anchoring means comprises a winding-unwinding winch capable anchor rope hanging provided and said anchor in response to the anchor on the dedicated board, the predetermined height is provided on the dedicated board A tension mooring floating structure according to claim 1 or 2, wherein the anchor suspension line extends from the anchor winch to the anchor through an upper portion of the chassis. Arranging the floating structure, the anchor and the tension mooring line in a predetermined position in a dry dock;
Next, after pouring water into the dock, the special ship is drawn in, and the floating structure, the anchor, and the tension mooring line are moored to the special ship,
Next, the installation method of the tension mooring floating body structure of any one of Claim 1 thru | or 3 which moves the said exclusive ship to the said construction position.   The installation method of the tension mooring floating structure of any one of the Claims 1 thru | or 4 with which the offshore facility is integrally mounted in the said floating structure. By using a floating structure installed on or under water, an anchor installed on the bottom of the water, and a tension mooring line disposed between the floating structure and the anchor, the buoyancy of the floating structure A ship used when mooring and installing the floating structure by applying tension to the tension mooring line,
First mooring means for mooring the floating structure connected to the stern side using the tension mooring line; and second mooring means for mooring while holding the anchor;
While maintaining the positional relationship and the floating structure and the anchor is anchored to the stern side is separated in the traveling direction of the ship, said I Ri engaging clasp vital said anchor to said first anchoring means the floating structure the It is capable of moving the water in the state Ri that engagement distillate was by the 2 anchoring means,
The anchor is installed on the bottom of the water while being suspended by an anchor suspension line by the second mooring means,
The tension mooring line is installed by the first mooring means between the floating structure and the anchor installed at the bottom of the water,
A tension mooring floating structure configured to apply a predetermined tension to the tension mooring line by adjusting the buoyancy of the floating structure and / or winding / rewinding the tension mooring line. Ship for the installation of things.   The tension mooring floating structure installation ship according to claim 6, wherein the first mooring means includes a tension mooring line winch capable of winding and unwinding the tension mooring line. Said second anchoring means comprises a winding-unwinding winch capable anchor rope hanging provided and said anchor in response to the anchor on the dedicated board, the predetermined height is provided on the dedicated board A tension mooring floating structure installation ship according to claim 6 or 7, wherein the anchor suspension line extends from the anchor winch to the anchor through an upper portion of the chassis.