Fixed structure

Abstract

To provide a fixing structure that allows easy inspection of bolts and nuts.SOLUTION: A fixing structure according to one embodiment comprises a support beam 61 that protrudes from a columnar portion and supports a stage structure, and a binding structure 70 that binds the support beam 61 to the stage structure. The tensioning structure 70 comprises: a beam support portion having a side portion 71 extending downward from the stage structure and a lower portion 72 that is located at the lower end of the side portion 71 and on which the support beam 61 is placed; and a binding material 78 including bolts 76 and nuts 77. At the lower portion 72 of the beam support portion, an insert hole into which the bolt 76 is inserted and a hole 90 that is located at the lower end of the insert hole and into which the nut 77, which is fastened to the bolt 76, enters from below are formed. The hole 90 is defined by an inner surface against which the nut 77, which is about to rotate, contacts.SELECTED DRAWING: Figure 16

Description

[Technical field]

[0001] The present disclosure relates to a fastening structure with fasteners including bolts and nuts. [Background technology]

[0002] JP 2003-27401 A describes a fixing structure for a sleeper. The sleeper is fixed to the ballast while placed on the ballast. The sleeper has a through hole through which a T-bolt passes, and a recess that opens to the upper surface at the upper end of the through hole. A T-bolt that is inserted into the ballast passes through the through hole, and a nut is fastened to the upper end of the T-bolt in the recess. A lock nut washer, a washer, and a nut are provided in the recess, and the nut is fastened to the T-bolt with the lock nut washer and washer placed on the bottom surface of the recess.

[0003] Japanese Patent No. 4855699 describes a base structure of a metal pipe column. The base structure includes a base plate placed on a concrete foundation. The base plate has a recess that opens vertically upward and a through hole that extends vertically downward from the bottom of the recess. An anchor bolt is embedded in the concrete foundation, and the base plate is placed on the concrete foundation with the anchor bolt inserted through the through hole and the recess. A nut is fastened to the anchor bolt in the recess. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-27401 A [Patent Document 2] Patent No. 4855699 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, a fixing structure in which nuts are fastened to bolts needs to be inspected periodically to check whether the bolts are corroded or loose. Incidentally, in a fixing structure in which a stage structure is fixed to a columnar portion, the nut may be fastened to the bolt from below. In a fixing structure in which a nut is fastened to a bolt from below, the bolt and nut must be inspected from below, which may make the inspection difficult. In particular, when the stage structure is located at a high position on the columnar portion, the bolt and nut must be inspected from below using scaffolding, which may make the inspection difficult.

[0006] The present disclosure aims to provide a fixing structure that allows easy inspection of bolts and nuts. [Means for solving the problem]

[0007] The fixing structure according to the present disclosure is a fixing structure for fixing a stage structure to a columnar portion of a structure. The fixing structure includes a support beam protruding from the columnar portion and supporting the stage structure, and a fastening structure fastening the support beam to the stage structure. The fastening structure includes a beam support portion having a side portion extending downward from the stage structure and a lower portion located at the lower end of the side portion on which the support beam is placed, and a fastening material including a bolt and a nut. The lower portion of the beam support portion is formed with an insert hole into which a bolt is inserted, and a hole portion located at the lower end of the insert hole and into which a nut fastened to the bolt enters from below. The hole portion is defined by an inner surface against which the nut abuts when it is about to rotate.

[0008] This fixing structure includes a support beam of a columnar portion that supports the stage structure, and the support beam is fastened to the stage structure by a fastening structure. The fastening structure includes a beam support portion and a fastening member that support the support beam, and the beam support portion has a side portion that extends downward from the stage structure and a lower portion that supports the support beam at the lower end of the side portion. An insert hole and a hole portion located at the lower end of the insert hole are formed in the lower portion of the beam support portion. The fastening member has a bolt that is inserted into the insert hole and a nut that is fastened to the bolt in a hole portion formed at the lower end of the insert hole, and the hole portion is defined by an inner surface against which the nut that is about to rotate abuts. Therefore, after inserting a bolt into the insert hole from above and fastening the bolt with a nut fitted in the hole portion, even if the nut tries to rotate in the hole portion, the nut abuts against the inner surface of the hole portion, so that the rotation of the nut in the hole portion is restricted by abutting against the inner surface. Therefore, since the nut does not loosen at the lower portion of the support beam and the fastening structure, it is possible to eliminate the need to inspect the bolt and nut from below. This eliminates the need to set up scaffolding to inspect the bolts and nuts from below, making it easy to inspect the bolts and nuts.

[0009] The fastening structure may include a cap that covers the nut and the bolt protruding downward from the nut. In this case, the bolt and the nut protruding downward can be protected by the cap, so that the corrosion of the bolt and the nut can be suppressed. Therefore, it is not necessary to inspect the bolt and the nut from below, so that the inspection work of the bolt and the nut can be performed more easily. Effect of the Invention

[0010] According to the present disclosure, bolts and nuts can be easily inspected. [Brief description of the drawings]

[0011] [Figure 1] 1 is a side view showing an offshore wind turbine generator that is an example of an application of a fixing structure according to an embodiment. [Diagram 2] FIG. 2 is a side view showing the foundation and transition piece of the offshore wind power generation device of FIG. 1. [Diagram 3] FIG. 3 is a perspective view showing the transition piece of FIG. 2. [Figure 4] FIG. 3 is a perspective view showing a dock facility of the transition piece of FIG. 2. [Diagram 5] FIG. 3 is a perspective view of the outer platform of the transition piece of FIG. 2. [Figure 6] FIG. 3 is a cross-sectional perspective view showing each platform of the transition piece of FIG. 2. [Figure 7] FIG. 3 is a perspective view of the outer platform of the transition piece of FIG. 2, seen from above. [Figure 8] FIG. 3 is a perspective view of the outer platform of the transition piece of FIG. 2, seen from below. [Figure 9] FIG. 9 is a perspective view showing a stage structure of the external platform of FIG. 8 and a support beam extending from a pillar portion. [Figure 10] 10 is a perspective view showing a cap exposed on the upper side of the stage structure of FIG. 9. FIG. [Figure 11] 11 is a perspective view showing a bolt and a nut exposed by removing the cap in FIG. 10. FIG. [Figure 12] 12 is a perspective view of the bolt and the nut in FIG. 11, seen from a different direction than in FIG. 10. [Figure 13] 10 is a perspective view showing a fastening structure for fastening a support beam to the stage structure of FIG. 9. [Figure 14] FIG. 14 is a perspective view showing the side and bottom of the binding structure of FIG. 13. [Figure 15] 15 is a cross-sectional view showing a schematic view of an insert hole formed in the lower portion of FIG. 14 and a bolt, a nut and a cap inserted into the hole portion. FIG. [Figure 16] 16 is a perspective view showing a state in which the cap is removed from the lower part of FIG. 15. FIG. [Figure 17] 16 is a perspective view of the hole in FIG. 15 as seen from below. FIG. [Figure 18] 16 is a bottom view showing the nut fitted into the hole in FIG. 15. FIG. [Figure 19]FIG. 2 is a perspective view showing a transition piece, a tower, and a tilt correction member according to the embodiment. [Figure 20] 19A is a plan view showing the inclination correction member of FIG 19, and FIG. 19B is a side view showing the inclination correction member of FIG 19. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the fixing structure according to the present disclosure will be described with reference to the drawings. Note that the present invention is not limited to the following examples, but is intended to include all modifications within the scope of the claims and equivalents thereto. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and duplicated descriptions are omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0013] The fixing structure according to the present embodiment is a fixing structure for a cylindrical transition piece installed on a foundation of an offshore structure. The offshore structure is, for example, a wind power generator. An example in which the fixing structure is applied to a wind power generator will be described below.

[0014] Fig. 1 is a side view showing a wind power generator 1 as an example to which the fixing structure according to this embodiment is applied. Fig. 2 is a side view showing a foundation 2 and a transition piece 3 of the wind power generator 1. As shown in Figs. 1 and 2, the wind power generator 1 is installed, for example, on the seabed B, and performs offshore wind power generation. However, the wind power generator 1 is not limited to being installed in the ocean, and may be installed in water other than the ocean, such as a lake or a river.

[0015] The wind turbine generator 1 includes a foundation 2, a transition piece 3 installed on the foundation 2, a tower 4 fixed to the transition piece 3, a nacelle 5 attached to the top of the tower 4, and blades 6 attached to the nacelle 5. The tower 4 is made of, for example, concrete or steel. A generator, a speed increaser, and the like are housed inside the nacelle 5, and for example, a rotor shaft protrudes from the speed increaser to the outside of the nacelle 5.

[0016] The blades 6 are fixed to the rotor shaft of the nacelle 5. The wind power generator 1 includes, for example, three blades 6. When the blades 6 rotate due to the wind, this rotation is increased to a certain rotation speed by an amplifier inside the nacelle 5, and this rotational motion is converted into electricity by a generator inside the nacelle 5. For example, the nacelle 5 includes a wind vane and anemometer, and generates electricity efficiently by controlling the direction of the rotor and the angle of the blades 6 according to the wind speed and direction.

[0017] The wind power generator 1 has, for example, a monopile foundation type, and a transition piece 3 is provided above the monopile foundation 2. The wind power generator 1 has the foundation 2 which is a monopile driven into the water W, and the transition piece 3 which extends upward from the foundation 2 and is connected to the lower end of the tower 4. Note that instead of the monopile foundation type, the foundation 2 may have a tripile-type offshore wind power foundation or a jacket-type offshore wind power foundation, and the type of the foundation 2 is not particularly limited.

[0018] For example, a scour prevention work 7 is provided around the foundation 2 on the seabed B, and the scour prevention work 7 prevents scouring of the ground around the foundation 2 on the seabed B. For example, the cross-sectional shape of the foundation 2 when cut on a horizontal plane is circular. As an example, the foundation 2 has a cylindrical shape.

[0019] The foundation 2 has, for example, a hole 2b through which water flows in and out of the foundation 2. The diameter of the foundation 2 is, for example, 4 m or more (as one example, 6 m). The foundation 2 has, for example, a cylindrical lower part 2c that is driven into the water W, and an upper part 2d whose diameter gradually decreases from the upper end of the lower part 2c toward the top. A transition piece 3 is installed in the upper part 2d.

[0020] Fig. 3 is a perspective view showing the transition piece 3. The transition piece 3 is provided to ensure the verticality of the wind turbine generator 1. As shown in Figs. 2 and 3, the transition piece 3 has a cylindrical columnar portion 3b extending along the vertical direction D1, and an external platform 10 located at the upper end of the columnar portion 3b. The transition piece 3 corresponds to a structure having the columnar portion 3b.

[0021] The columnar portion 3b has, for example, an upper portion 3d on which the external platform 10 is placed, and a lower portion 3f whose diameter gradually increases from the lower end of the upper portion 3d downward. The external platform 10 is installed on the columnar portion 3b so as to protrude horizontally from the upper end of the columnar portion 3b.

[0022] The lower part 3f of the transition piece 3 is a portion through which the upper part 2d of the foundation 2 passes. For example, the transition piece 3 is joined (grout joined) to the foundation 2 by filling the gap between the lower part 3f and the upper part 2d of the foundation 2. Note that the means for joining the transition piece to the foundation is not limited to the above-mentioned grout joining. The means for joining the transition piece to the foundation may be, for example, a bolt joining, and is not particularly limited. Also, the transition piece may be joined to the foundation in advance (for example, before being driven into the seabed B).

[0023] For example, the transition piece 3 includes a ladder 3h for an operator to get on and off the pillar-shaped portion 3b, and a rest platform 3j for the operator to rest on. The ladder 3h extends, for example, from a lower portion 3f of the pillar-shaped portion 3b to an upper end of the pillar-shaped portion 3b. The transition piece 3 includes, for example, a plurality of rest platforms 3j, each of which is provided at a respective one of a plurality of intermediate portions of the ladder 3h.

[0024] Fig. 4 is an enlarged perspective view of a part of the columnar portion 3b of the transition piece 3. As shown in Fig. 3 and Fig. 4, the transition piece 3 has an electric wire pipe 3k and a grout pipe 3m. The electric wire pipe 3k accommodates, for example, an electric wire for ICCP (Impressed Current Cathodic Protection).

[0025] The transition piece 3 has, for example, an electrode 3r arranged so as to protrude from the columnar portion 3b. The electrode 3r is an anode (external anode of the ICCP system) arranged in the water W. A current flows through the electrode 3r to suppress electrolytic corrosion caused by potential differences in each part of the transition piece 3. The grout piping 3m is a piping through which grout that fixes the transition piece 3 to the foundation 2 passes.

[0026] The transition piece 3 has a dock facility 3g on the pillar-shaped portion 3b. Ships carrying workers who climb up to the transition piece 3 and perform work on the transition piece 3 arrive at the dock facility 3g. The dock facility 3g includes, for example, two poles 3p extending along the vertical direction D1 and a plurality of connecting members 3q that connect the poles 3p to the pillar-shaped portion 3b.

[0027] The bow of the ship carrying workers fits between the two poles 3p. For example, the distance between the two poles 3p is set to be wide enough for workers to access the ship. A ladder 3h is provided between the two poles 3p. Therefore, workers who get off the ship can use the ladder 3h to climb up to the external platform 10 of the transition piece 3.

[0028] For example, a rest platform 3j is provided above the pole 3p. For example, a plurality of joint members 3q of the dock facility 3g are arranged in a line along the pole 3p. The joint members 3q are, for example, columnar and protrude from the columnar portion 3b, and connect each pole 3p to the columnar portion 3b. The pole 3p and the plurality of joint members 3q are, for example, integrated.

[0029] 5 is a perspective view showing the external platform 10 of the transition piece 3. The external platform 10 is also referred to as an upper platform. The external platform 10 is a platform to which the lower end of the tower 4 is joined and on which cargo is placed. The external platform 10 includes, for example, a crane 10b, a power supply device 10c, and a staircase 10d.

[0030] The external platform 10 is provided at the upper end of the ladder 3h, and a worker can climb the ladder 3h to enter the external platform 10. For example, the crane 10b is a davit crane, and the power supply unit 10c is a crane power supply unit that supplies power to the crane 10b.

[0031] The tower 4 has an opening 4b through which the transition piece 3 and the inside of the tower 4 can be accessed from the external platform 10. A worker can move from the opening 4b to the inside of the transition piece 3. The opening 4b of the tower 4 is provided, for example, at a position higher than the lower end of the tower 4, and a worker can enter the opening 4b by climbing a staircase 10d in front of the opening 4b.

[0032] The transition piece 3 has, for example, a flange portion 3y (see FIG. 7) located at the upper end portion of the columnar portion 3b, and the tower 4 has a flange portion 4c located at the lower end thereof. For example, the flange portion 3y of the transition piece 3 is a portion that protrudes radially outward and radially inward from the upper end of the columnar portion 3b, and the flange portion 4c of the tower 4 is a portion that protrudes radially outward and radially inward from the lower end of the tower 4. However, for example, the flange portion of the transition piece 3 may be a portion that protrudes only radially inward from the upper end of the columnar portion 3b, and the flange portion 4c of the tower 4 may be a portion that protrudes only radially inward from the lower end of the tower 4. Inside the transition piece 3 and the tower 4, a computer or the like that operates each device of the transition piece 3 and the tower 4 is arranged.

[0033] The flange portion 3y of the transition piece 3 and the flange portion 4c of the tower 4 have a plurality of through holes (not shown) that are aligned along the circumferential direction D2 of the transition piece 3 and penetrate in the vertical direction D1. The transition piece 3 and the tower 4 are joined by inserting bolts into each through hole of the flange portion 3y of the transition piece 3 and each through hole of the flange portion 4c of the tower 4 and tightening the bolts with nuts.

[0034] Fig. 6 is an exploded perspective view showing the internal structure of the transition piece 3. As shown in Fig. 6, the transition piece 3 includes a platform 3c having a portion extending in the horizontal direction. The platform 3c includes the external platform 10 described above, a cable termination platform 20 to which a plurality of cables are bundled, an airtight platform 30 that blocks air from flowing vertically upward, and a lower platform 40 located above a joint 40A to which the foundation 2 is joined. A ladder 3x is provided inside the transition piece 3, and it is possible to descend from the external platform 10 to the cable termination platform 20, the airtight platform 30, and the lower platform 40 using the ladder 3x.

[0035] The cable termination platform 20 is provided below the external platform 10 and above the airtight platform 30. The cable termination platform 20 is a platform where a cable from the water W is connected to a cable of the tower 4.

[0036] The airtight platform 30 is provided below the cable termination platform 20 and above the lower platform 40. The airtight platform 30 is a platform that blocks air communication between the upper and lower parts of the transition piece 3. The airtight platform 30 has a function of blocking air from seawater.

[0037] The airtight platform 30 is made of, for example, carbon steel and is painted to prevent rust. The airtight platform 30 blocks air from seawater, making it possible to create an environment in the internal space of the transition piece 3 above the airtight platform 30 that is less susceptible to corrosion (less susceptible to rust, etc.).

[0038] The lower platform 40 is, for example, a platform on which work is performed to install the transition piece 3 on the foundation 2. As an example, on the lower platform 40, grout is filled between the upper part 2d of the foundation 2 and the lower part 3f of the transition piece 3 (joint 40A), and the grout hardens to perform work to grout-join the transition piece 3 to the foundation 2. For example, the portion of the transition piece 3 below the lower platform 40 corresponds to the joint 40A where it is joined to the foundation 2.

[0039] Fig. 7 is a perspective view showing the external platform 10 without the tower 4 installed. As shown in Fig. 7, the external platform 10 has, for example, an arc-shaped part 10A located directly above the columnar part 3b of the transition piece 3, and a rectangular part 10B extending from the arc-shaped part 10A. For example, the crane 10b and the power supply device 10c are provided in the rectangular part 10B.

[0040] The external platform 10 includes a handrail 10f provided along the outer edge of the external platform 10. For example, a plurality of pieces of luggage 10g are placed on the external platform 10. For example, a handrail structure 50 is disposed on each of the external platform 10 and the cable termination platform 20. FIG. 7 shows an example in which the handrail structure 50 is disposed on the inner side of the flange portion 3y of the external platform 10.

[0041] 8 is a perspective view of the external platform 10 as viewed from below. The fixing structure 60 according to this embodiment is provided, for example, at a connection portion between the columnar portion 3b and the external platform 10. The external platform 10 has a stage structure 11 that protrudes outward from the columnar portion 3b, and the stage structure 11 includes, for example, an arc-shaped portion 10A and a rectangular portion 10B. The fixing structure 60 is a structure for fixing the stage structure 11 to the columnar portion 3b.

[0042] A plurality of first beams 12 extending in a longitudinal direction D3 of the stage structure 11, a plurality of second beams 13 extending in a lateral direction D4 of the stage structure 11, and a plurality of third beams 14 extending radially outward of the columnar portion 3b are fixed to the lower surface 11b of the stage structure 11. Furthermore, an outer peripheral beam portion 17 extending along the outer periphery of the stage structure 11, and an inner peripheral beam portion 15 extending annularly on the radially outer side of the columnar portion 3b are fixed to the lower surface 11b of the stage structure 11.

[0043] The fixing structure 60 includes a support beam 61 protruding from the columnar portion 3b, and a fastening structure 70 that fastens the support beam 61 to the stage structure 11. The support beam 61 is provided to support the stage structure 11. A plurality of support beams 61 are arranged to protrude from the columnar portion 3b. For example, the support beam 61 includes a first support beam 61A extending along the longitudinal direction D3, and a second support beam 61B extending from the columnar portion 3b radially outward of the columnar portion 3b.

[0044] As an example, the first support beam 61A is longer than the second support beam 61B. For example, the first support beam 61A is fixed to the first beam 12, and the second support beam 61B is fixed to the inner peripheral beam portion 15. The configuration of the second support beam 61B is, for example, the same as the configuration of the first support beam 61A. Therefore, hereinafter, when there is no need to distinguish between the first support beam 61A and the second support beam 61B, they will be collectively described as the support beam 61.

[0045] Fig. 9 is a perspective view showing the lower surface 11b of the stage structure 11, the support beam 61 (first support beam 61A), and the fastening structure 70. As shown in Fig. 9, the fastening structure 70 includes a beam support portion 73 that supports the support beam 61 extending from the columnar portion 3b. The beam support portion 73 has a side portion 71 that extends downward from the stage structure 11, and a lower portion 72 that is located at the lower end of the side portion 71 and on which the support beam 61 is placed.

[0046] For example, the fastening structure 70 has an insertion portion 74 that enters between the support beam 61 and the first beam 12 from the side portion 71, and an upper end portion 75 located at the upper end of the side portion 71. Fig. 10 is a perspective view showing the upper end portion 75 of the side portion 71. As shown in Fig. 10, for example, a plurality of gratings 16 are provided on the upper surface of the stage structure 11, and each grating 16 is removable. In the stage structure 11, when the grating 16 is removed, the lower portion of the stage structure 11 can be seen, and the upper end portion 75 is exposed upward when the grating 16 is removed.

[0047] A cap 80 is provided on the upper end 75. Fig. 11 is a perspective view showing a state in which the cap 80 has been removed from the upper end 75. As shown in Figs. 9 to 11, the fastening structure 70 includes fastening members 78 including bolts 76 and nuts 77, and the cap 80 protects the fastening members 78 including the bolts 76 and nuts 77. Without the cap 80, the bolts 76 and nuts 77 are exposed upward.

[0048] Fig. 12 is a perspective view of the fastening material 78 seen from a different direction than that of Fig. 11. Fig. 13 is a perspective view of the fastening structure 70. As shown in Figs. 12 and 13, the bolt 76 extends in the vertical direction D1 inside the side portion 71, and a nut 77 is fastened to each of the upper and lower ends of the bolt 76. For example, two nuts 77 are fastened to the bolt 76 exposed at the upper end portion 75, and a washer 79 is interposed between the nut 77 and the upper surface of the upper end portion 75.

[0049] Fig. 14 is a perspective view showing a fastening structure 70. As shown in Fig. 13 and Fig. 14, the fastening structure 70 has a pair of side parts 71 aligned along the width direction D5 of the support beam 61, a lower part 72 connecting the lower ends of the pair of side parts 71, and an insertion part 74 extending in the width direction D5 between the pair of side parts 71. Furthermore, the fastening material 78 has two bolts 76 inserted into each side part 71, and a plurality of nuts 77 fastened to the upper and lower ends of the bolts 76, respectively.

[0050] Fig. 15 is a vertical cross-sectional view showing the lower portion 72, the bolt 76, and the nut 77. Fig. 16 is a perspective view showing a state in which the cap 80 has been removed from Fig. 14. As shown in Figs. 15 and 16, the side portion 71 and the lower portion 72 are formed with an insert hole 70b into which the bolt 76 is inserted, and the insert hole 70b extends, for example, along the vertical direction D1.

[0051] A hole 90 is formed in the lower portion 72 of the beam support portion 73, into which a nut 77, which is located at the lower end of the insert hole 70b and is fastened to the bolt 76, enters from below. The nut 77 that enters the hole 90 and the bolt 76 that protrudes downward from the nut 77 are covered with a cap 80.

[0052] The cap 80 is made of, for example, resin. As an example, the cap 80 is made of high density polyethylene (HDPE). In this case, the rigidity and durability of the cap 80 can be increased. The cap 80 has a bottomed tubular shape (for example, a bottomed cylindrical shape). The cap 80 has a first portion 81 into which the nut 77 fits and a second portion 82 into which the bolt 76 protruding from the nut 77 is screwed.

[0053] The first portion 81 extends in the axial direction of the cap 80 from the opening 83 of the cap 80, and has an inner side surface 81b and a bottom surface 81c. The second portion 82 is a hole extending in the axial direction of the cap 80 from the bottom surface 81c of the first portion 81. The cap 80 protects the bolt 76 and the nut 77 by having the bolt 76 screwed into the second portion 82 and covering the nut 77 with the first portion 81.

[0054] Fig. 17 is a perspective view of the hole 90 as viewed from below. Fig. 18 is a diagram showing the outer shape of the hole 90 and the nut 77. As shown in Figs. 17 and 18, the hole 90 is defined by an inner surface 91 against which the nut 77 abuts when it is about to rotate. The hole 90 is defined by a plurality of inner surfaces 91 and a bottom surface 92 in which the insert hole 70b is formed.

[0055] The shape of the hole 90 as viewed from below is, for example, the same as the shape of the nut 77. Specifically, the shape of the hole 90 is, for example, the same as the shape of the nut 77. The "nut shape" refers to a shape that can restrict the rotation of the nut fitted in the hole. The "nut shape" does not have to be strictly the same as the shape of the nut, and may be any shape that can restrict the rotation of the nut even if it is different from the shape of the nut.

[0056] For example, when the nut 77 is fitted in the hole 90, each of the multiple inner surfaces 91 of the hole 90 faces a corresponding outer surface 77b of the nut 77. As an example, the hole 90 has six inner surfaces 91, the nut 77 has six outer surfaces 77b, and when the nut 77 is fitted in the hole 90, each outer surface 77b is close to each inner surface 91. By providing the hole 90 with the inner surfaces 91 formed as described above, it is possible to reliably restrict the rotation of the nut 77 fitted in the hole 90.

[0057] Next, the action and effect of the fixing structure 60 according to this embodiment will be described in detail. As shown in Fig. 15 to Fig. 17, the fixing structure 60 includes a support beam 61 of the columnar portion 3b that supports the stage structure 11, and the support beam 61 is fastened to the stage structure 11 by a fastening structure 70. The fastening structure 70 includes a beam support portion 73 that supports the support beam 61 and a fastening material 78, and the beam support portion 73 has a side portion 71 that extends downward from the stage structure 11 and a lower portion 72 that supports the support beam 61 at the lower end of the side portion 71.

[0058] An insert hole 70b and a hole portion 90 located at the lower end of the insert hole 70b are formed in the lower portion 72 of the beam support portion 73. The fastener 78 has a bolt 76 inserted into the insert hole 70b and a nut 77 fastened to the bolt 76 in a hole portion 90 formed at the lower end of the insert hole 70b, and the hole portion 90 is defined by an inner surface 91 against which the nut 77 abuts as it tries to rotate.

[0059] Therefore, since the rotation of the nut 77 is restricted by the hole 90, the nut 77 does not become loose at the support beam 61 and the lower portion 72 of the fastening structure 70, and therefore inspection of the bolt 76 and the nut 77 from below is not required. Therefore, since there is no need to set up scaffolding to inspect the bolt 76 and the nut 77 from below, the inspection work of the bolt 76 and the nut 77 can be easily performed. Note that although inspection of the bolt 76 and the nut 77 at the upper end portion 75 is necessary, in this embodiment, it is possible to inspect only the upper end portion 75.

[0060] In this embodiment, the fastening structure 70 includes a cap 80 that covers the nut 77 and the bolt 76 that protrudes downward from the nut 77. Therefore, the bolt 76 and the nut 77 that protrude downward can be protected by the cap 80, and corrosion of the bolt 76 and the nut 77 can be suppressed. Therefore, the need for inspection of the bolt 76 and the nut 77 from below can be further reduced, and the inspection work of the bolt 76 and the nut 77 can be performed more easily.

[0061] The above describes the embodiment of the fixing structure according to the present disclosure. However, the fixing structure according to the present disclosure is not limited to the above-mentioned embodiment, and may be appropriately modified within the scope of the gist described in the claims. In other words, the configuration, shape, size, number, material, and arrangement of each part of the fixing structure are not limited to the above-mentioned embodiment, and may be appropriately modified.

[0062] For example, in the above embodiment, the wind power generator 1 has been described in which the flange portion 4c of the tower 4 is directly placed on the flange portion 3y of the transition piece 3. However, as shown in Fig. 19, the wind power generator 1 may include an inclination correction member 100 interposed between the flange portion 3y and the flange portion 4c. The inclination correction member 100 is interposed between the transition piece 3 and the tower 4 to correct the inclination of the tower 4 with respect to the transition piece 3.

[0063] The inclination correction member 100 has, for example, a plate shape. The flange portion 4c has a plurality of insertion holes 4d through which bolts for fixing the tower 4 to the transition piece 3 are inserted, and the flange portion 3y has a plurality of insertion holes through which the bolts passed through the insertion holes 4d are inserted. The position of the insertion holes 4d in a plan view coincides with the position of the insertion holes of the flange portion 3y in a plan view.

[0064] FIG. 20(a) is a plan view showing the inclination correction member 100. FIG. 20(b) is a side view showing the inclination correction member 100. As shown in FIG. 19, FIG. 20(a) and FIG. 20(b), the inclination correction member 100 has, for example, a circular ring shape. The inclination correction member 100 has an insertion hole 101 through which a bolt is inserted into the insertion hole 4d of the flange portion 4c and the insertion hole of the flange portion 3y. The inclination correction member 100 has a plurality of insertion holes 101, which are arranged so as to be aligned along the circumferential direction D6 of the inclination correction member 100. In addition, two insertion holes 101 are aligned along the radial direction D7 of the inclination correction member 100.

[0065] The inclination correction member 100 has a lower surface 102 that contacts the flange portion 3y and an upper surface 103 that contacts the flange portion 4c. The upper surface 103 is inclined with respect to the lower surface 102. As a result, the inclination correction member 100 has a thick portion 104 located on one side in the radial direction D7 and a thin portion 105 located on the other side in the radial direction D7. The inclination correction member 100 having the thick portion 104 and the thin portion 105 is inserted between the flange portion 3y and the flange portion 4c, thereby correcting the inclination of the tower 4 with respect to the transition piece 3.

[0066] The inclination angle of the upper surface 103 relative to the lower surface 102 is designed, for example, by measuring in advance the inclination of the tower 4 relative to the transition piece 3 and designing it according to the measured inclination. By interposing the inclination correction member 100 having the inclination angle between the transition piece 3 and the tower 4, the verticality of the tower 4 can be more reliably ensured.

[0067] For example, in the above embodiment, the fastening structure 70 including the side portion 71, the lower portion 72, the insertion portion 74, the upper end portion 75, the bolt 76, and the nut 77 has been described. The configuration of the fastening structure is not limited to the above example and can be changed as appropriate. In addition, the cap is not limited to the cap 80 including the first portion 81 and the second portion 82 and can be changed as appropriate in terms of material, shape, size, etc.

[0068] In the above embodiment, the fixing structure 60 provided on the stage structure 11 of the external platform 10 of the transition piece 3 has been described. However, the fixing structure according to the present disclosure may be a fixing structure provided in another location, such as the cable termination platform 20. In addition, in the above embodiment, the transition piece 3 having the docking facility 3g, the ladder 3h, the electric wire pipe 3k, and the grout pipe 3m has been described. However, the components of the transition piece are not limited to the above example of the transition piece 3 and can be changed as appropriate. The structure of the platform 3c of the transition piece 3 can also be changed as appropriate.

[0069] In the above-described embodiment, a description has been given of the transition piece 3 of the wind turbine 1, which includes the foundation 2, the transition piece 3, the tower 4, the nacelle 5, and the blades 6. However, the configurations of the foundation, the transition piece, the tower, the nacelle, and the blades are not limited to those in the above-described embodiment and can be changed as appropriate.

[0070] In the above embodiment, an example has been described in which the structure having the columnar portion 3b is the transition piece 3 of the wind power generator 1. However, the fixing structure according to the present disclosure can also be applied to structures other than the transition piece 3 of the wind power generator 1. The fixing structure according to the present disclosure can also be applied to other offshore structures such as an oil platform, or structures other than offshore structures, for example. [Explanation of symbols]

[0071] 1...wind turbine, 2...foundation, 2b...hole, 3...transition piece (structure), 3b...columnar part, 3c...platform, 3g...landing equipment, 3h...ladder, 3j...rest platform, 3k...electrical wiring pipe, 3m...grout pipe, 3p...pole, 3q...connecting member, 3r...electrode, 3x...ladder, 3y...flange part, 4...tower, 4b...opening, 4c...flange part, 5...nacelle, 6 ...Blade, 7...Scour prevention structure, 10...External platform, 10A...Circular portion, 10b...Crane, 10B...Rectangular portion, 10c...Power supply unit, 10d...Stairs, 10f...Handrail, 10g...Luggage, 11...Stage structure, 11b...Underside, 12...First beam, 13...Second beam, 14...Third beam, 15...Inner peripheral beam, 16...Grating, 17...Outer peripheral beam, 20...Cable termination plate form, 30...airtight platform, 40...lower platform, 40A...joint, 50...handrail structure, 60...fixing structure, 61...support beam, 61A...first support beam, 61B...second support beam, 70...fastening structure, 70b...insert hole, 71...side, 72...lower part, 73...beam support part, 74...insertion part, 75...upper end, 76...bolt, 77...nut, 77b...outer surface, 78...fastening material , 79...washer, 80...cap, 81...first part, 81b...inner surface, 81c...bottom surface, 82...second part, 83...opening, 90...hole portion, 91...inner surface, 92...bottom surface, 100...tilt correction member, 101...insertion hole, 102...bottom surface, 103...top surface, 104...thick portion, 105...thin portion, B...seabed, D1...vertical direction, D2...circumferential direction, D3...longitudinal direction, D4...short direction, D5...width direction, W...underwater.

Claims

1. A structure for fixing a stage structure to a columnar portion of a structure, a support beam protruding from the columnar portion and supporting the stage structure; a fastening structure for fastening the support beam to the stage structure; Equipped with The binding structure is a beam support portion having a side portion extending downward from the stage structure and a lower portion on which the support beam is placed, the beam support portion being located at a lower end of the side portion; and a fastening material including a bolt and a nut, The lower portion of the beam support portion is formed with an insert hole into which the bolt is inserted, and a hole portion located at a lower end of the insert hole and into which the nut fastened to the bolt is inserted from below, The hole is defined by an inner surface against which the nut abuts when it is rotated. Fixed structure.

2. The fastening structure includes a nut and a cap that covers the bolt and protrudes downward from the nut. The fixing structure according to claim 1 .

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