Positioning method during concrete rings connection in floating type offshore wind power generation facility

Abstract

To facilitate positioning when concrete rings are connected.SOLUTION: A floating type offshore wind power generation facility includes a concrete floating body part 4A in which concrete rings 15 are connected and the respective concrete rings 15 are bound by a PC steel material 19 to be integrated. Collimation targets 30 are attached to a concrete ring 15 to be attached (an attached concrete ring 15) and a concrete ring 15 which has been installed (an installed concrete ring 15), and a total station 31 is disposed at a position such that all of the collimation targets 30 can be collimated. On the basis of the position coordinate measured by collimating the collimation targets 30 by the total station 31, a position adjustment amount of the attached concrete ring 15 relative to the installed concrete ring 15 is calculated to perform positioning and make the connection.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a method of aligning when connecting a plurality of concrete precast cylindrical bodies (concrete rings) in a height direction and connecting the mounting-side concrete ring to the installed-side concrete ring in a floating offshore wind power facility provided with a floating body part made of concrete in which each concrete ring is tightly connected by PC steel materials to achieve integration, when constructing the concrete floating body part.

Background Art

[0002] Conventionally, power generation methods such as mainly hydraulic power, thermal power, and nuclear power generation have been adopted. In recent years, however, wind power generation that uses natural wind for power generation has attracted attention from the viewpoints of environmental protection and effective utilization of natural energy. This wind power generation facility includes an onshore installation type and an offshore (mainly marine) installation type. In the case of Japan, which has mountainous terrain behind the coastal area, there are few plains where stable winds can be expected in the coastal area. On the other hand, Japan is surrounded by the sea on all sides, and has advantages such as easy access to winds suitable for power generation at sea and few installation restrictions. Therefore, in recent years, many types of offshore wind power facilities and floating structures have been proposed.

[0003] The floating structures are roughly classified into a barge-type floating body that floats the floating body on the water surface, a semi-submersible type that sinks the lower part of the floating body underwater and floats it in a semi-submerged state, and a spar type that floats in an upright state like a fishing float.

[0004] The applicant of the present application proposed, in Patent Document 1 below regarding the spar-type floating body, an offshore wind power generation facility comprising a floating body, a mooring cable, a tower, a nacelle installed at the top of the tower, and a plurality of windmill blades, wherein the floating body is a spar-type floating body structure composed of a lower concrete floating body structure (hereinafter referred to as the concrete floating body part) in which a plurality of precast cylindrical bodies made of concrete are stacked in multiple stages in the height direction and each precast cylindrical body is tightly connected by PC steel materials to achieve integration, and an upper steel floating body structure (hereinafter referred to as the steel floating body part) continuously provided above the concrete floating body part. Such an offshore wind power generation facility is hereinafter referred to as a spar-type offshore wind power generation facility.

[0005] As a method for constructing the floating body of the spar-type offshore wind power generation facility, the concrete floating body part and the steel floating body part were each assembled in a horizontally laid state, and finally, these were combined using a large crane ship to complete the floating body (see Patent Document 2 below).

[0006] In particular, in the assembly of the concrete floating body part, since the concrete floating body part is constructed in a horizontal state with it lying on its side, a concrete ring manufactured in a vertical orientation with its axial direction oriented in the vertical direction is erected so that its axial direction is oriented in the horizontal direction, and the erected concrete ring on the mounting side is lifted by a crane and aligned with the concrete ring on the installed side and connected.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] As a method of aligning the concrete ring on the mounting side with the concrete ring on the installed side, conventionally, as shown in FIG. 12, a level measuring instrument 80 has been used. The alignment method using this level measuring instrument 80 is performed by sighting with the level measuring instrument 80 from the rear side of the mounting ring and aligning the angle and horizontal position between the mounting ring and the targets respectively attached to the installed side.

[0009] However, such an alignment method can only be adjusted between the mounting ring sighted with the level measuring instrument 80 and the target on the installed side. Therefore, it is necessary to perform measurements at multiple points, and since adjusting the alignment between the targets at one location affects the others, it is necessary to repeat trial and error, which takes time for alignment.

[0010] Therefore, the main problem of the present invention is to provide an alignment method at the time of connecting concrete rings in a floating offshore wind power generation facility that enables easy alignment when connecting concrete rings.

Means for Solving the Problems

[0011] As the present invention according to claim 1 for solving the above problems, in a floating offshore wind power generation facility provided with a concrete floating body portion in which a plurality of concrete rings are connected and each concrete ring is tightened and integrated by PC steel materials, an alignment method at the time of connecting concrete rings, Alignment targets are respectively attached to the concrete ring on the mounting side and the concrete ring on the installed side, a total station is arranged at a position where all these alignment targets can be sighted, and based on the position coordinates measured by sighting the alignment targets with the total station, the amount of position adjustment of the concrete ring on the mounting side with respect to the concrete ring on the installed side is calculated, and an alignment method at the time of connecting concrete rings in a floating offshore wind power generation facility is provided, characterized by performing alignment and connection.

[0012] In the invention described in claim 1, in the method of aligning the positions when connecting concrete rings to manufacture a concrete floating body part by connecting a plurality of concrete rings, sighting targets are respectively attached to the concrete ring on the mounting side and the concrete ring on the installed side, a total station is arranged at a position where all these sighting targets can be sighted, and based on the position coordinates measured by sighting the sighting targets with the total station, the amount of position adjustment of the concrete ring on the mounting side with respect to the concrete ring on the installed side is calculated, and alignment is performed and they are connected.

[0013] In this way, with one total station, the position coordinates of the concrete rings on the installed side and the mounting side can be measured simultaneously. Therefore, based on the measured position coordinates, the relative angle and relative position of the concrete ring on the mounting side can be calculated with high precision, and it becomes possible to connect accurately with only one alignment, making it easier to align when connecting the concrete rings.

[0014] As the invention according to claim 2, a first step of lifting the concrete ring on the mounting side with a crane, a second step of attaching the sighting target to the joint end face of the concrete ring on the installed side, a third step of attaching the sighting target to the joint end face of the concrete ring on the mounting side at a position corresponding to the sighting target attached to the concrete ring on the installed side, a fourth step of arranging the total station at a position on the side between the concrete ring on the installed side and the concrete ring on the mounting side where all the sighting targets can be sighted, and sighting all the sighting targets to measure their respective position coordinates, a fifth step of obtaining the coordinate system of the plane of the joint end face of the concrete ring on the installed side and obtaining the coordinate system of the plane of the joint end face of the concrete ring on the mounting side, and calculating the amount of position adjustment of the plane of the joint end face of the concrete ring on the mounting side from the inclination and the deviation amount of the center position of these two planes. A sixth step of adjusting any one or two or more of the lifting length, moving amount, and rotation angle of the crane according to the position adjustment amount of the concrete ring on the mounting side, aligning, and connecting is included. A method for alignment during connection of a concrete ring in a floating offshore wind power generation facility according to claim 1 is provided.

[0015] In the invention according to claim 2 above, the concrete ring on the mounting side is lifted by a crane, and after calculating the position adjustment amount with respect to the installed side, any one or two or more of the lifting length, moving amount, and rotation angle of the crane are adjusted to perform alignment and connection. In this way, if the adjustment of the lifting length, moving amount, and rotation angle of the crane can be performed remotely, it becomes possible to automate the alignment during connection of the concrete ring.

[0016] As the invention according to claim 3, a method for alignment during connection of a concrete ring in a floating offshore wind power generation facility according to claim 1, wherein the sighting target is a full - circumference prism is provided.

[0017] In the invention according to claim 3 above, since a full - circumference prism (360 - degree prism) is used as the sighting target, it becomes possible to sight with a total station from all directions without worrying about the orientation of the prism.

[0018] As the invention according to claim 4, a method for alignment during connection of a concrete ring in a floating offshore wind power generation facility according to claim 1, wherein the sighting target is attached to the tip of the PC steel material for tightly connecting the concrete ring and the opening of the sheath through which the PC steel material is inserted, respectively.

[0019] In the invention according to claim 4 above, by providing the sighting target at the tip of the PC steel material for tightly connecting the concrete ring and the opening of the sheath through which the PC steel material is inserted as the mounting positions, the PC steel material can be accurately inserted into the sheath hole, and the concrete ring on the mounting side can be accurately connected to the concrete ring on the installed side.

[0020] The present invention according to claim 5 provides a method for aligning concrete rings when connecting them in a floating offshore wind power generation facility according to claim 1, wherein the collimation targets are attached at four locations in four directions from the center of the concrete ring.

[0021] The invention described in claim 5 above shows a preferred example of the mounting positions and number of collimation targets for one concrete ring.

[0022] According to a sixth aspect of the present invention, there is provided a method for aligning concrete rings when connecting them in the floating offshore wind power generation facility according to the first aspect, in which a plurality of the concrete rings are connected horizontally or vertically.

[0023] In the invention described in claim 6 above, the direction in which the concrete rings are connected may be horizontal, in which multiple concrete rings are connected horizontally to construct the concrete floating body in a laid-down position, or vertical, in which multiple concrete rings are connected vertically to construct the concrete floating body in an upright position. Effect of the Invention

[0024] As described above in detail, according to the present invention, it becomes possible to easily align the concrete rings when connecting them in the manufacture of the floats of a floating offshore wind power generation facility. [Brief description of the drawings]

[0025]

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Figure 12

Embodiments for Carrying Out the Invention

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0027] 〔Hybrid Spar-Type Offshore Wind Power Generation Facility 1〕 First of all, the spar type offshore wind power generation facility 1 to which the present invention is applied will be described in detail based on FIGS. 1 to 5.

[0028] As shown in detail in FIG. 1, the spar type offshore wind power generation facility 1 is composed of a spar type cylindrical floating body 4, a mooring cable 10, a tower 6, a nacelle 8 installed at the top of the tower 6, and a windmill 7 composed of a plurality of blades 9, 9...

[0029] As shown in FIG. 2, the floating body 4 is composed of a concrete precast cylindrical body 15, 15... (hereinafter also referred to as "concrete ring 15") stacked in a plurality of stages in the height direction, and each precast cylindrical body 15, 15... is tightly connected by PC steel material 19 to form an integrated concrete floating body part 4A, and a steel floating body part 4B continuously provided above the concrete floating body part 4A.

[0030] In the hollow part of the floating body 4, ballast materials such as water, gravel, fine aggregate or coarse aggregate, and metal particles can be input or discharged, and the buoyancy (draft) can be adjusted. The input / discharge of the ballast material can be achieved by adopting the fluid transportation method proposed by the applicant in Japanese Patent Application Laid-Open No. 2012-201217.

[0031] The concrete floating body part 4A is composed of concrete precast cylindrical bodies 15, 15... The precast cylindrical body 15 is a circular cylindrical precast member having the same cross-section in the axial direction, and each is manufactured using the same formwork or a hollow precast member manufactured by centrifugal forming is used.

[0032] In addition to the reinforcing bars 20 in the wall surface, sheaths 21, 21... for inserting PC steel materials 19 at appropriate intervals in the circumferential direction are embedded. At the lower end of these sheaths 21, 21..., a sheath enlarged diameter part 21a is formed to enable insertion of a coupler for connecting the PC steel materials 19 to each other, and at the upper part, a box cutting part 22 for fitting a fixing anchor plate is formed. Further, a plurality of hanging fittings 23 are provided on the upper surface.

[0033] The fastening of the precast cylindrical bodies 15 to each other is as follows. As shown in Fig. 4(A), when the precast cylindrical bodies 15 are stacked while inserting PC steel materials 19, 19... extending upward from the lower precast cylindrical body 15 into sheaths 21, 21..., the anchor plate 24 is fitted into the cutout portion 22, and tension is introduced into the PC steel material 19 by the nut member 25 to achieve integration. Further, grout material is injected into the sheath 21 from the grout injection hole 27. Note that the hole 24a formed in the anchor plate 24 is a grout injection confirmation hole, and the filling of the grout material is completed when the grout material is discharged from the confirmation hole.

[0034] Next, as shown in Fig. 4(B), when a coupler 26 is screwed onto the protruding portion of the PC steel material 19 and the upper PC steel materials 19, 19... are connected, the PC steel materials 19, 19... are inserted into the sheaths 21, 21... of the upper precast cylindrical body 15 while stacking, and the procedure for fixing the PC steel material 19 in the above manner is sequentially repeated to stack in the height direction. At this time, an adhesive 28 such as an epoxy resin-based material and a sealing material are applied to the joint surface between the lower precast cylindrical body 15 and the upper precast cylindrical body 15 to ensure water tightness and join the mating surfaces.

[0035] The steel floating body portion 4B is composed of a steel cylindrical body 17 located relatively on the lower side and a steel cylindrical body 18 located relatively on the upper side. The lower steel cylindrical body 17 has the same outer diameter dimension as the precast cylindrical body 15 at the lower part, and as shown in Fig. 5, it is connected to the precast cylindrical body 15 by bolts or welding etc. (bolt fastening in the illustrated example). The upper part of the steel cylindrical body 17 has a frustum of a cone shape with a gradually decreasing diameter.

[0036] The upper steel cylindrical body 18 has an outer diameter dimension continuous with the upper outer diameter of the lower steel cylindrical body 17, and is connected to the lower steel cylindrical body 17 by bolts or welding etc. (bolt fastening in the illustrated example). These steel cylindrical bodies 17, 18 are composed of steel rings divided by a predetermined weight, and each steel ring is integrated by being welded in the circumferential direction.

[0037] On the one hand, the tower 6 is made of steel, concrete, or PRC (prestressed reinforced concrete), but preferably, it is made of steel to reduce the total weight. The outer diameter of the tower 6 is substantially the same as that of the upper steel cylindrical body 18, and the outer shape is continuous in the vertical direction without steps or the like.

[0038] As shown in FIG. 1, the mooring point P of the mooring cable 10 to the floating body 4 is set below the sea surface and at a position higher than the center of gravity G of the floating body 4. Therefore, it is possible to prevent the ship from coming into contact with the mooring cable 10. In addition, in order to generate a resistance moment centered on the center of gravity G of the floating body 4 at the mooring point P to suppress excessive tilting of the floating body 4, the tilting posture state of the tower 6 can be appropriately maintained.

[0039] On the other hand, the nacelle 8 is a device equipped with a generator that converts the rotation of the windmill 7 into electricity, a controller that can automatically change the angle of the blade 9, and the like.

[0040] 〔First Embodiment Example〕 The first embodiment example is a case where a floating body construction method is adopted to complete the floating body 4 in a lying-on-side state.

[0041] <Floating Body Construction Method> As a floating body construction method for completing the lying-on-side floating body 4 at the quay yard, the method according to Japanese Patent Application Laid-Open No. 2018-173011 proposed by the applicant can be preferably adopted.

[0042] As shown in FIG. 6, in that floating body construction method, a steel ring connection yard A, a concrete ring production yard B, and a concrete ring connection yard C are defined and provided at the quay yard.

[0043] On the steel ring connection yard A, a first overhead crane 50 is provided so as to be movable in a fixed direction, and pedestals 52, 52... with a rotating function are installed at appropriate intervals in the traveling direction of the first overhead crane. Also, a mobile tent 56 that is movable in the traveling direction of the first overhead crane is provided. On the concrete ring production yard B, a mobile tent 57 is provided, and a set of manufacturing facilities for the concrete ring is installed. On the concrete ring connection yard C, a second overhead crane 55 is provided so as to be movable in a fixed direction, and a mobile tent 58 that is movable in the traveling direction of the second overhead crane is provided.

[0044] Then, steel rings 51, 51... are sequentially installed on the pedestals 52, 52... with the rotating function using the first overhead crane 50, and if necessary, the surroundings are covered with the mobile tent 56. While rotating the steel rings 51, 51... around the axis, welding is performed in the circumferential direction to connect them, completing the first step of the steel floating body part 53B. If the steel floating body part 53B is moved to the concrete ring connection yard C and installed at a predetermined position, the concrete rings 15 manufactured in the concrete ring production yard B are sequentially transported to the concrete ring connection yard C, and if necessary, the surroundings are covered with the mobile tent 58. The second step of completing the floating body 53 by connecting the concrete rings 15 to the steel floating body part 53B using the second overhead crane 55 and tightening and integrating them with PC steel materials. This is a method for constructing the floating body of a spar-type offshore wind power generation facility. <Method for aligning positions during connection of concrete rings> Next, the method for aligning positions during connection of concrete rings during the manufacture of the concrete floating body part 4A according to the present invention will be described in detail with reference to FIGS. 7 to 10.

[0045] As shown in FIGS. 7 and 8, the alignment method is to attach the sighting targets 30 to the concrete ring 15 on the mounting side and the concrete ring 15 on the installed side respectively, arrange the total station 31 at a position where all these sighting targets 30... can be sighted, and calculate the position adjustment amount of the concrete ring 15 on the mounting side relative to the concrete ring 15 on the installed side based on the position coordinates measured by sighting the sighting target 30 with the total station 31, and then perform the alignment.

[0046] As the sighting target 30, for example, a reflector or a prism can be preferably used, and it is particularly preferable to use a full-circle prism (360-degree prism). The full-circle prism is a light reflection device capable of reflecting light from almost 360 degrees in all directions. By using a full-circle prism as the sighting target 30, even when the automatic tracking mode of the total station 31 is used, the reflected light from the sighting target 30 can always be obtained by the automatic tracking total station.

[0047] The total station 31 is a surveying instrument equipped with a telescope unit for sighting for distance measurement and angle measurement, and having a drive unit for rotating the device part supporting the telescope unit in the horizontal direction and swinging the telescope unit in the pitching direction. By sighting the sighting target 30... with the total station 31, as shown in FIG. 9, the position coordinates (x, y, z) at the sighting target 30 attachment site of the concrete ring 15 can be measured.

[0048] Hereinafter, the alignment method will be described in detail step by step.

[0049] (Step 1) First, as a preparation step, as shown in FIGS. 7 and 8, the concrete ring 15 on the mounting side is lifted by a crane. As shown in FIG. 6, the concrete ring 15 manufactured vertically with the axial direction in the vertical direction in the concrete ring manufacturing yard B is moved to the concrete ring connection yard C, fixed on an erection stand (not shown) there, and after winding a suspension sling or the like in the circumferential direction of the outer peripheral surface, it is erected so as to be in the horizontal direction with the axial direction in the horizontal direction. Next, the concrete ring 15 is lifted by the second gantry crane 55 with two positions in the front and rear in the axial direction as suspension fulcrums on each of the left and right sides of the concrete ring 15 on the mounting side. In the middle of the suspension wire 32 extending upward from each suspension fulcrum, a winch mechanism 33 capable of winding up and winding down the suspension wire 32 is provided.

[0050] Among the winch mechanisms 33 provided at each of the four suspension fulcrums, two positions in the front and rear in the axial direction on each of the left and right sides of the concrete ring 15 on the mounting side, by operating the two winch mechanisms 33 on the left and right separately, it is possible to adjust the rotation (roll) of the lifted concrete ring 15 around its central axis, and by operating the two winch mechanisms 33 in the front and rear in the axial direction separately, it is possible to adjust the rotation (pitch) of the lifted concrete ring 15 around a horizontal axis orthogonal to its central axis. Further, by making it possible to independently adjust the front and rear positions of the suspension wire suspended from the second gantry crane 55 on the left and right respectively, it is possible to adjust the rotation (yaw) of the lifted concrete ring 15 around a vertical axis orthogonal to its central axis. Also, by moving the second gantry crane 55 back and forth, moving the suspension wire left and right, and adjusting the suspension length, it is possible to adjust the position of the lifted concrete ring 15 in the front, rear, left, right, and up and down directions.

[0051] (Second Step) Next, in the second step, the alignment target 30 is attached to the joint end face of the already installed concrete ring 15. The attachment position of the alignment target 30 may be any position as long as it can determine the coordinate system of the plane of the joint end face of the already installed concrete ring 15. However, it is preferably attached to four positions in four directions from the central axis of the concrete ring 15, specifically, both ends in the horizontal direction perpendicular to the central axis and both ends in the vertical direction. The alignment target 30 only needs to be attached at at least three positions, which is the number required to determine the coordinate system of the plane, and may also be attached at five or more positions.

[0052] (Third step) In the third step, the alignment target 30 is attached to the joint end face of the attaching-side concrete ring 15 at a position corresponding to the alignment target 30 attached to the already installed concrete ring 15. The corresponding position means the same position that overlaps when the attaching-side concrete ring 15 is joined to the already installed concrete ring 15.

[0053] Regarding the installation order of the alignment target 30, it may be either the already installed side or the attaching side first. However, it is important that the attachment position of the alignment target 30 to be installed later is the position corresponding to the alignment target 30 installed earlier.

[0054] The position where the alignment target 30 is attached may be the joint end face (concrete surface) of the concrete ring 15 or the like. However, as shown in Fig. 10, it is preferably attached to the tip of the PC steel material 19 that tightens the concrete ring 15 and the opening of the sheath 21 through which the PC steel material 19 is inserted (when a sheath diameter expansion part 21a for inserting a coupler into the end of the sheath 21 is formed as in the illustrated example, that sheath diameter expansion part 21a). That is, the alignment target 30 is attached to the tip of the PC steel material 19 protruding from the joint end face of the installed-side concrete ring 15, and the alignment target 30 is attached to the opening of the sheath 21 formed on the joint end face of the mounting-side concrete ring 15 into which the PC steel material 19 is inserted. This makes it easier to insert the PC steel material 19 into the sheath 21 and further facilitates the joining of the installed-side and mounting-side concrete rings 15.

[0055] As shown in Fig. 10(A), the alignment target 30 attached to the PC steel material 19 is provided at a position where the separation distance L from the joint end face of the concrete ring 15 is constant. Thus, by performing correction by this separation distance L, the coordinate position of the joint end face can be accurately obtained.

[0056] The alignment target 30 attached to the installed-side concrete ring 15 is formed with a recess into which the tip of the PC steel material 19 can be inserted, and the alignment target 30 attached to the mounting-side concrete ring 15 is formed with a protrusion that can be inserted into the sheath 21.

[0057] In the sighting target 30 attached to the concrete ring 15 on the mounting side, the convex portion inserted into the opening of the sheath 21 may be formed in a columnar shape with the same diameter in the axial direction as shown in Fig. 10(B). However, as shown in Fig. 10(C), it is preferable to use a tapered convex portion 30a provided with a taper that gradually increases in diameter from the tip side to the base end side. Thereby, when the tapered convex portion 30a is inserted into the opening (sheath diameter-expanded portion 21a) of the sheath 21, the sighting target 30 is always installed at the center of the opening, so that the alignment accuracy of the concrete ring 15 can be improved.

[0058] (Step 4) In the fourth step, on the side between the installed concrete ring 15 and the mounting-side concrete ring 15, a total station 31 is placed at a position where all the sighting targets 30 can be sighted, and all the sighting targets 30 are sighted to measure their respective position coordinates. In this way, since the position coordinates of both the installed side and the mounting side can be measured at once with one total station, even if there is a measurement error, the error occurs in the same way on the installed side and the mounting side. Therefore, considering the relative error, it becomes quite small, and the relative accuracy of both becomes high, contributing to the improvement of the alignment accuracy.

[0059] (Step 5) From the position coordinates of each sighting target 30 measured in the fourth step, the coordinate system of the plane of the joint end face of the installed concrete ring 15 is obtained, and the coordinate system of the plane of the joint end face of the mounting-side concrete ring 15 is obtained. From the displacement amount, inclination amount, and rotation angle of the coordinate origins of these two planes, the position adjustment amount of the plane of the joint end face of the mounting-side concrete ring 15 is calculated. The calculation of the coordinate system of the plane and the calculation of the displacement amount, inclination amount, and rotation angle of the two planes can be easily obtained by conventionally known geometric calculations.

[0060] (Step 6) After removing the collimation target 30, according to the amount of position adjustment of the concrete ring 15 on the mounting side obtained in the fifth step above, the suspension length, the moving amount of the second gantry crane 55, and the payout length of the winch mechanism 33 are adjusted as described above to perform alignment and connection. By remotely operating these operations of the second gantry crane 55 and the winch mechanism 33, alignment can be automated, and further labor saving of the work becomes possible.

[0061] The alignment of the displacement amount, the inclination amount, and the rotation angle of the coordinate origins of the two planes can be performed simultaneously by prior calculation, but it is preferable to perform them in order. The order at this time is not particularly limited and is arbitrary, but it is preferable to adjust the displacement amount of the coordinate origin first, then adjust the inclination amounts of the two planes, and finally adjust the rotation angles of the two planes. By adjusting in this order, the accuracy of the position adjustment of the two planes is improved, and the adjustment work can be performed quickly.

[0062] 〔Second Embodiment〕 The second embodiment is a case where a floating body construction method is adopted in which the floating body 4 is completed in an upright longitudinal state.

[0063] As a longitudinal floating body construction method, as shown in FIG. 11, a hoisting machine such as a crane (not shown) is provided in a quay yard, and the concrete rings 15 are sequentially stacked in the height direction using this crane, and are tightly connected by PC steel materials to integrate them, thereby completing a concrete floating body portion 4A. The place where the concrete floating body portion 4A is constructed is not limited to the quay yard, and may be on a barge installed at sea or the like.

[0064] As shown in Fig. 11, the crane is provided with a rotation angle adjustment mechanism 61 for rotating a vertically suspended concrete ring 15 on the mounting side with its axial direction in the vertical direction around the central axis, and a plurality of winch mechanisms 62, 62... are provided on the lower surface of the rotation angle adjustment mechanism 61. The concrete ring 15 on the mounting side is lifted by wires fed out from these plurality of winch mechanisms 62, 62.... By adjusting the rotation angle of the rotation angle adjustment mechanism 61, the rotation angle of the concrete ring 15 on the mounting side around the central axis can be adjusted. Also, by adjusting the feeding length by winding up and down the suspension wires of the winch mechanisms 62, 62..., the angle of the plane of the joint end surface of the concrete ring 15 on the mounting side can be adjusted, and the amount of movement of the concrete ring 15 on the mounting side in the height direction can be adjusted by adjusting the suspension length of the crane.

[0065] The method of alignment during the connection of the concrete rings can be carried out according to the above first embodiment example.

[0066] 〔Other embodiment examples〕 In the above embodiment example, the floating body 4 is a spar-type floating body composed of a concrete floating body part 4A and a steel floating body part 4B connected in series above the concrete floating body part 4A. However, when the floating body 4 is a spar-type floating body composed only of a concrete floating body part 4A in which a plurality of concrete rings 15, 15... are stacked in multiple stages and each concrete ring 15, 15... is tightly connected and integrated by PC steel materials 19, it can be constructed in the same procedure. Of course, the same applies to other floating body structures.

Explanation of reference numerals

[0067] 1... Spar-type offshore wind power generation facility, 4... Floating body, 4A... Concrete floating body part, 4B... Steel floating body part, 6... Tower, 7... Wind turbine, 8... Nacelle, 9... Blade, 10... Mooring cable, 15... Precast cylindrical body (concrete ring), 19... PC steel material, 30... Sighting target, 31... Total station, 32... Suspension wire, 33... Winch mechanism

Claims

1. A method for aligning concrete rings during connection in a floating offshore wind power facility equipped with a concrete floating body part in which a plurality of concrete rings are connected and each concrete ring is tightened and integrated with PC steel materials, comprising: Mounting sighting targets on the concrete ring on the mounting side and the concrete ring on the installed side respectively, arranging a total station at a position where all these sighting targets can be sighted, and calculating the position adjustment amount of the concrete ring on the mounting side with respect to the concrete ring on the installed side based on the position coordinates measured by sighting the sighting targets with the total station, and performing alignment and connection. A method for aligning concrete rings during connection in a floating offshore wind power facility.

2. A first step of lifting the concrete ring on the mounting side with a crane; A second step of attaching the sighting target to the joint end face of the concrete ring on the installed side; A third step of attaching the sighting target to a position on the joint end face of the concrete ring on the mounting side corresponding to the sighting target attached to the concrete ring on the installed side; A fourth step of arranging the total station at a position on the side between the concrete ring on the installed side and the concrete ring on the mounting side where all the sighting targets can be sighted, and sighting all the sighting targets to measure their respective position coordinates; A fifth step of obtaining the coordinate system of the plane of the joint end face of the concrete ring on the installed side and obtaining the coordinate system of the plane of the joint end face of the concrete ring on the mounting side, and calculating the position adjustment amount of the plane of the joint end face of the concrete ring on the mounting side from the inclination and the deviation amount of the center position of these two planes. A sixth step of adjusting any one or two or more of the hoisting length, moving amount, and rotation angle of the crane according to the amount of position adjustment of the concrete ring on the mounting side, performing alignment, and connecting, is included in the alignment method during concrete ring connection in the floating offshore wind power generation facility according to claim 1.

3. The alignment method during concrete ring connection in the floating offshore wind power generation facility according to claim 1, wherein the sighting target is a full-circle prism.

4. The alignment method during concrete ring connection in the floating offshore wind power generation facility according to claim 1, wherein the sighting target is respectively attached to the tip of the PC steel material for tightly connecting the concrete ring and the opening of the sheath through which the PC steel material passes.

5. The alignment method during concrete ring connection in the floating offshore wind power generation facility according to claim 1, wherein the sighting target is attached at four locations in four directions from the center of the concrete ring.

6. The alignment method during concrete ring connection in the floating offshore wind power generation facility according to claim 1, wherein a plurality of the concrete rings are connected horizontally or vertically.

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