JP6444810B2 - Offshore wind turbine installation method and transition piece - Google Patents

Description

  The present invention relates to a method for installing an offshore wind turbine and a transition piece.

  In recent years, an attempt to effectively use natural energy by installing a windmill for wind power generation on the ocean has attracted attention. When installing a windmill on the ocean, when constructing it using a crane ship or the like that does not have a means to fix the hull, it is usually a larger crane ship than the general heavy weight class that is determined according to the size of the offshore windmill. By selecting, the influence of the swaying by the waves is reduced (for example, see Patent Document 1).

  When using a hull with a self-elevating device, move the hull to the windmill foundation while holding the wind turbine equipment with the holding means provided on the hull, and fix the hull with the self-elevating device. After that, there is a method of hanging the wind turbine equipment and installing it on a pile (for example, see Patent Document 2).

Furthermore, as a method of reducing the swaying of suspended loads when transporting offshore wind turbines on a work ship, the suspended load is suspended from a crane, and horizontally supported by an anti-sway frame girder that can rotate around the left and right sides of the work ship's hull. Has been proposed (see, for example, Patent Document 3).
The offshore wind turbine is installed by inserting a pile into a transition piece joined to the lower end of the tower of the wind turbine.

Japanese Patent No. 48388885 JP 2013-63767 A Patent Publication No. 5306863

  When using a crane ship that does not have a means to fix the hull, it is difficult to align the transition piece joined to the lower end of the offshore windmill and the pile due to the influence of waves and wind, or the transition piece and the pile There was a problem of being impacted by collision.

  The present invention has been made in view of the above-described problems, and the purpose of the present invention is to prevent collision between members caused by waves or swaying caused by wind when installing an offshore wind turbine on a pile. This is an offshore wind turbine installation method and transition piece that can be reduced.

  In order to achieve the above-mentioned object, the first invention is a pile cover which is a cylindrical body whose upper end is closed, and a cylindrical body whose upper end is closed, which is larger in diameter than the pile cover, Using a transition piece comprising a guide pile provided with an annular tube on the peripheral surface, the guide pile is joined to the lower end of an offshore wind turbine, and the pile cover is put on the upper end of the pile, The guide pile is lowered in a state where the tube is in contact with the outer peripheral surface of the pile cover while introducing air into each of the spaces inside the step a, the tube, and the guide pile. An offshore wind turbine installation method comprising: a step b for covering the pile cover with the guide pile; and a step c for integrating the pile cover and the guide pile.

  In the installation method of the offshore windmill of 1st invention, air is introduce | transduced into the space inside a guide pile in the state which sealed the clearance gap between a pile cover and a guide pile with a tube. Thereby, the part of a guide pile will be in a state like an air damper, the collision of the members by the sway produced by a wave and a wind at the time of joining an offshore windmill and a pile can be prevented, and an impact can be reduced.

  In the step b, for example, an insertion guide that is an uneven portion in the axial direction provided on the inner peripheral surface of the guide pile is fitted into an uneven portion in the axial direction provided on the outer peripheral surface of the pile cover. Thereby, positioning of a guide pile becomes easy.

  In the step c, the first flange provided on the outer peripheral surface of the pile cover and the second flange provided on the lower end portion of the guide pile are fastened with a fastener, and the pile cover and the guide are It is desirable to integrate the pile. Thereby, a pile cover and a guide pile can be integrated easily.

  The offshore windmill is gripped by using, for example, a first keeper device and a second keeper device provided in a leader device held by a boom of a crane installed on a work table floating on the water, and the leader The apparatus is suspended by a linear material on the boom via a vibration absorbing device, and absorbs the shaking of the work table using the vibration absorbing device in the step b. Thereby, the shaking of the work table caused by waves and winds can be absorbed, and collision between members can be prevented.

  The vibration absorbing device is, for example, a hydraulic cylinder. If the vibration absorbing device is a hydraulic cylinder, the vibration of the work table can be absorbed by an inexpensive device.

  Further, the second keeper device may be connected to the crane via two telescopic catch hawks, and in the step b, the plane position of the offshore wind turbine may be corrected using the catch hawks. . Thereby, the plane position of the guide pile integrated with the lower end of the offshore windmill can be adjusted easily.

  The second invention is a pile cover and a cylindrical body, and has a guide pile installed at the lower end of the offshore wind turbine, having a larger diameter than the pile cover, provided with an annular tube on the inner peripheral surface, Air can be introduced into the inside of the guide pile and the tube, and in the state where the tube of the guide pile is in contact with the outer peripheral surface of the pile cover, each of the space inside the tube and the guide pile It is a transition piece for installing an offshore wind turbine characterized in that the guide pile can be lowered while introducing air to the cover, and the guide pile can be covered and integrated with the pile cover.

  In the transition piece of the second invention, air is introduced into the space inside the guide pile in a state where the gap between the pile cover and the guide pile is sealed with a tube. Thereby, the part of a guide pile will be in a state like an air damper, the collision of the members by the sway produced by a wave or a wind at the time of windmill installation is prevented, and an impact can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, when installing an offshore windmill in a pile, the installation method and transition piece of an offshore windmill which can prevent the collision of the members by the vibration produced by a wave and a wind and can reduce an impact can be provided.

The figure which shows the process of carrying out beach removal of the offshore windmill 21 Sectional view by arrow CC shown in FIG. The figure which shows the process of joining the offshore windmill 21 and the pile 27 Enlarged view of the vicinity of transition piece 23 The figure which shows the cross section of the pile cover 29 and the guide pile 41 The figure which shows the process of covering the guide pile 41 on the pile cover 29 The figure which shows the process of integrating the pile cover 29 and the guide pile 41

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a process of taking off the offshore wind turbine 21 from the beach. FIG. 2 is a cross-sectional view taken along arrows CC shown in FIG.

  As shown in FIGS. 1 and 2, the barge 1 is a work table that floats on the water 25, and a crane 3 is provided on the barge 1. A leader holding portion 7 is provided at the upper end of the boom 5 of the crane 3. The leader holding portion 7 is a U-shaped member in plan view, and the reader device 15 is held in the U-shape. Near one end of the boom 5 of the crane 3, one end of two catch hawks 9 is connected. The two catch hawks 9 are telescopic and extend and contract independently in the direction of arrow A shown in FIG. Further, the catch hawk 9 is rotatable in the direction of arrow B shown in FIG.

  The other ends of the two catch hawks 9 are connected to a second keeper device 13 provided near the lower end of the reader device 15. The leader holding unit 7 is connected to the keeper device 13 through a hydraulic cylinder 19 that is a vibration absorbing device, using a wire 17 that is a linear material. The leader holding unit 7 has a wire 17 winding / unwinding device (not shown).

  The leader device 15 is slidable in the vertical direction by winding and unwinding the wire 17 that connects the leader holding unit 7 and the keeper device 13. The grip portion 13a of the keeper device 13 can be opened and closed as shown by the dotted line in FIG. The reader device 15 has a keeper device 11 near the upper end. The grip portion 11a of the keeper device 11 can be opened and closed in the same manner as the grip portion 13a.

  As shown in FIG. 1, when the offshore wind turbine 21 is beached, the vicinity of the upper end of the tower of the offshore wind turbine 21 is gripped by the grip portion 11 a of the first keeper device 11 provided in the reader device 15. . The transition piece 23 provided at the lower end portion of the offshore wind turbine 21 is held by the holding portion 13 a of the second keeper device 13 provided in the reader device 15. Then, the wire 17 is wound using a winding / unwinding device (not shown), and the catch hawk 9 is appropriately expanded and contracted and rotated in the directions shown by arrows A and B in FIG. Lift up. Then, the carriage 1 is navigated, and the offshore wind turbine 21 and the transition piece 23 are transported above the pile 27.

  FIG. 3 is a diagram illustrating a process of joining the offshore wind turbine 21 and the pile 27. 3A is a view of the offshore wind turbine 21 viewed from the side, and FIG. 3B is a view of the offshore wind turbine 21 viewed from the front. As shown in FIG. 3A, when joining the offshore wind turbine 21 and the pile 27, it is desirable to arrange the offshore wind turbine 21 on the side of the top boat 1 in order to maintain the stability of the top boat 1. .

  4 is an enlarged view of the vicinity of the transition piece 23, that is, an enlarged view of a range D shown in FIG. In FIG. 4, illustration of the keeper device 13 is omitted. FIG. 5 is a view showing a cross section of the pile cover 29 and the guide pile 41. 5A is a cross-sectional view taken along the arrow EE shown in FIG. 4, and FIG. 5B is a cross-sectional view taken along the arrow FF shown in FIG. The transition piece 23 includes a pile cover 29 and a guide pile 41 shown in FIGS. 4 and 5.

  As shown in FIG. 4, the pile cover 29 is a cylindrical body whose upper end is closed, and the top portion has a conical shape. The pile cover 29 is put on the upper end of the pile 27. An angle member 33 is provided on the inner peripheral surface 31 of the pile cover 29. When the pile 27 is inserted into the pile cover 29, the installation height of the pile cover 29 is determined by the angle member 33 on the inner peripheral surface 31 of the pile cover 29 coming into contact with the upper end of the pile 27.

  A gap 35 is provided between the inner peripheral surface 31 of the pile cover 29 and the outer peripheral surface of the pile 27. When the pile cover 29 is inserted into the pile 27, the inclination is corrected by finely adjusting the installation angle of the pile cover 29 using the gap 35. Then, the pile 27 and the pile cover 29 are integrated by filling the gap 35 with a grout material (not shown).

  As shown in FIG. 4, the pile cover 29 is provided with a flange 39 as a first flange on the outer peripheral surface 37. Further, as shown in FIG. 5B, two guide grooves 57 are provided on the outer peripheral surface 37. The guide groove 57 is a concave line provided in the axial direction of the pile cover 29.

  As shown in FIG. 4, the guide pile 41 is a cylindrical body whose upper end is closed and is fixed to the lower end of the tower 55 of the offshore wind turbine 21. The guide pile 41 has a larger diameter than the pile cover 29, and an air tube 45 is provided in an annular shape near the lower end of the inner peripheral surface 43. The guide pile 41 has an air tube hose 51 for injecting air into the air tube 45. In addition, a pressure hose 53 for injecting air into the guide pile 41 is provided.

  As shown in FIG. 4, the guide pile 41 is provided with a flange 49 as a second flange at the lower end. 4 and 5A, two insertion guides 47 are provided on the inner peripheral surface 43. The insertion guide 47 is a ridge provided in the axial direction of the guide pile 41 and is provided at a position corresponding to the guide groove 57 of the pile cover 29.

  FIG. 6 is a diagram illustrating a process of covering the guide pile 41 with the pile cover 29. When the guide pile 41 is put on the pile cover 29, the wire 17 shown in FIG. 3 and the like is unwound using a winding / unwinding device (not shown), and the catch hawk 9 is appropriately rotated and expanded / contracted to obtain an offshore wind turbine 21. Is suspended to the position of the stake 27. Then, as shown in FIG. 6, the axial insertion guide 47 provided on the inner peripheral surface 43 of the guide pile 41 is fitted into the axial guide groove 57 provided on the outer peripheral surface 37 of the pile cover 29. . At this time, if necessary, the two catch hawks 9 are appropriately expanded and contracted to correct the planar position of the offshore wind turbine 21 to which the guide pile 41 is joined.

  When the guide pile 41 is put on the pile cover 29, air is introduced into the air tube 45 using the air tube hose 51, and the air tube 45 of the guide pile 41 is brought into contact with the outer peripheral surface 37 of the pile cover 29. And in the state which sealed the clearance gap between the outer peripheral surface 37 of the pile cover 29 and the inner peripheral surface 43 of the guide pile 41, using the pressure hose 53, introducing air into the space 59 inside the guide pile 41, The guide pile 41 is slid along the pile cover 29 and lowered by the weight of the offshore wind turbine 21, and the guide pile 41 is placed on the pile cover 29.

  By introducing air into the space 59 inside the guide pile 41 in a state where the air tube 45 of the guide pile 41 is in contact with the outer peripheral surface 37 of the pile cover 29, the air pressure in the space 59 increases, and the portion of the guide pile 41 Becomes a state like an air damper, and it is possible to prevent the pile cover 29 and the guide pile 41 from colliding with each other due to swaying caused by waves or wind.

  When the offshore wind turbine 21 is suspended above the pile cover 29 or when the guide pile 41 is placed on the pile cover 29, the sway of the carriage 1 is detected by a sensor or the like, and is provided on the wire 17 shown in FIG. The hydraulic cylinder 19 is expanded and contracted to absorb the swaying of the boat 1 due to waves and winds, thereby preventing collision between members. After covering the pile pile 29 with the guide pile 41, the holding part 11a and the holding part 13a are removed from the offshore wind turbine 21 as necessary, and the carriage 1 is retracted.

  FIG. 7 is a diagram illustrating a process of integrating the pile cover 29 and the guide pile 41. After the guide pile 41 is put on the pile cover 29, as shown in FIG. 7, a flange 39 provided on the outer peripheral surface 37 of the pile cover 29 and a flange 49 provided on the lower end portion of the guide pile 41 are fastened. Fasten at 61. The fastener 61 is, for example, a bolt and a nut. Thereafter, a grout material (not shown) is injected into the gap between the outer peripheral surface 37 of the pile cover 29 and the inner peripheral surface 43 of the guide pile 41, and the pile cover 29 and the guide pile 41 are integrated.

  As described above, in the present embodiment, the transition piece 23 is configured by the pile cover 29 and the guide pile 41, the air tube 45 provided annularly on the inner peripheral surface 43 of the guide pile 41, and the inside of the guide pile 41 While introducing air into each of the spaces 59, the guide pile 41 is lowered while the air tube 45 is brought into contact with the outer peripheral surface 37 of the pile cover 29 integrated with the upper end of the pile 27, so that the guide pile 41 is covered with the pile cover. 29. As a result, the portion of the guide pile 41 becomes like an air damper, and when the offshore wind turbine 21 and the pile 27 are joined, the collision between the guide pile 41 and the pile cover 29 due to the sway caused by waves and winds is prevented, and the impact is reduced. Can be reduced.

When the guide pile 41 is covered with the pile cover 29, the axial insertion guide 47 provided on the inner peripheral surface 43 of the guide pile 41 is fitted into the axial guide groove 57 provided on the outer peripheral surface 37 of the pile cover 29. If it does, positioning of the guide pile 41 will become easy.
Moreover, if the flange 39 provided in the outer peripheral surface 37 of the pile cover 29 and the flange 49 provided in the lower end part of the guide pile 41 are fastened with the fastener 61, the pile cover 29 and the guide pile 41 will be easy. Can be integrated.

  Further, when the offshore wind turbine 21 is transported and installed using the crane 3 installed on the trolley 1 floating on the water 25, the leader device 15 used for gripping the offshore wind turbine 21 is replaced with a hydraulic cylinder 19 which is a vibration absorbing device. The hydraulic cylinder 19 can be used to absorb the swaying of the carrier 1 due to waves and winds. If the vibration absorbing device is the hydraulic cylinder 19, it is possible to absorb the motion of the carriage with an inexpensive device.

  If the keeper device 13 that holds the offshore wind turbine 21 is connected to the crane 3 via the two telescopic catch hawks 9, the catch hawk 9 can be used to cover the guide pile 41 on the pile cover 29. The plane position of the windmill 21 can be easily corrected.

  In the present embodiment, the guide cover 57 is provided in the pile cover 29 and the insertion guide 47 is provided in the guide pile 41. However, a ridge may be provided in the pile cover 29 as a guide, and a groove may be provided in the guide pile 41. . The number of uneven portions provided in the pile cover 29 and the guide pile 41 is not limited to two. Further, the vibration absorber is not limited to the hydraulic cylinder 19 and the installation location is not limited to the wire 17 portion. The crane 3 may be provided with a vibration absorber.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1 ......... Boat 3 ......... Crane 5 ......... Boom 7 ......... Leader holding part 9 ......... Catch hawk 11, 13 ......... Keeper device 11a, 13a ......... Holding part 15 ......... Leader Device 17 ......... Wire 19 ......... Hydraulic cylinder 21 ......... Offshore windmill 23 ......... Transition piece 27 ......... Pile 29 ......... Pile cover 31, 43 ......... Inner peripheral surface 35 ......... Gap 37 ......... Outer peripheral surface 39, 49 ... …… Flange 41 ... …… Guide pile 45 ……… Air tube 47 ……… Insertion guide 51 ……… Air tube hose 53 ……… Pressure air hose 57 ……… Guide Groove 59 ……… Space 61 ……… Fastener

Claims (7)

A pile cover that is a cylindrical body with its upper end closed;
A guide body in which the vicinity of the upper end is closed and has a larger diameter than the pile cover, and an annular tube is provided on the inner peripheral surface,
Using a transition piece consisting of
The guide pile is joined to the lower end of the offshore wind turbine,
Step a for covering the pile cover on the top of the pile and integrating with the pile,
While introducing air into each of the tube and the space inside the guide pile, the guide pile is lowered in a state where the tube is in contact with the outer peripheral surface of the pile cover, and the guide pile is moved to the pile cover. Step b.
A step c of integrating the pile cover and the guide pile;
The installation method of the offshore windmill characterized by comprising.   In the step b, the insertion guide, which is an axial concavo-convex portion provided on the inner peripheral surface of the guide pile, is fitted into an axial concavo-convex portion provided on the outer peripheral surface of the pile cover. The installation method of the offshore windmill of Claim 1 to do.   In the step c, the first flange provided on the outer peripheral surface of the pile cover and the second flange provided on the lower end of the guide pile are fastened with a fastener, and the pile cover and the guide are The installation method of the offshore windmill according to claim 1 or 2, wherein a pile is integrated. The offshore windmill is gripped using a first keeper device and a second keeper device provided in a leader device held by a boom of a crane installed on a work table floating on the water, and the leader device is , Suspended by a linear material on the boom via a vibration absorber,
The installation method of the offshore windmill according to any one of claims 1 to 3, wherein in the step b, the shaking of the work table is absorbed using the shaking absorbing device.   The offshore wind turbine installation method according to claim 4, wherein the vibration absorbing device is a hydraulic cylinder. The second keeper device is connected to the crane via two telescopic catch hawks;
The installation method of the offshore windmill according to claim 4 or 5, wherein in the step b, the plane position of the offshore windmill is corrected using the catch hawk. Pile cover that is a cylindrical body with the upper end closed and is put on the upper end of the pile,
A cylindrical body with a closed upper end, a larger diameter than the pile cover, an annular tube on the inner peripheral surface, and a guide pile installed at the lower end of the offshore wind turbine,
Comprising
Air can be introduced into the inside of the guide pile and the tube,
With the tube of the guide pile in contact with the outer peripheral surface of the pile cover, the guide pile is lowered while introducing air into each of the space inside the tube and the guide pile. A transition piece for installing an offshore wind turbine, characterized in that the pile cover can be covered and integrated.

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