JP2023077468A - Fixing structure - Google Patents

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

FIELD OF THE DISCLOSURE The present disclosure relates to a fastening structure with fasteners including bolts and nuts.

Japanese Laid-Open Patent Publication No. 2003-27401 describes a tie fixing structure. The sleepers are fixed to the track bed while being placed on the track bed. The sleeper has a through hole through which the T-bolt is passed, and a recess opening to the upper surface at the upper end of the through hole. A T-bolt inserted through the track bed is passed 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 while the lock nut washer and the washer are placed on the bottom surface of the recess.

Japanese Patent No. 4855699 describes a base structure of a metal pipe column. The base structure comprises a base plate resting on foundation concrete. The base plate has a recess opening vertically upward and a through hole extending vertically downward from the bottom surface of the recess. Anchor bolts are embedded in the base concrete, and the base plate is placed on the base concrete with the anchor bolts inserted through the through holes and recesses. A nut is fastened to the anchor bolt in the recess.

Japanese Patent Application Laid-Open No. 2003-27401 Japanese Patent No. 4855699

As described above, a fixed structure in which a nut is fastened to a bolt needs to be periodically inspected to confirm whether the bolt is corroded or loosened. By the way, in the fixing structure in which the stage structure is fixed to the columnar portion, there are cases where nuts are fastened to the bolts from below. In a fixed structure in which a nut is fastened to a bolt from below, the bolt and nut must be inspected from below, which may make inspection work difficult. In particular, when the stage structure is located at a high position in the columnar portion, scaffolding must be assembled and the bolts and nuts must be inspected from below, so there is concern that inspection work will become difficult.

An object of the present disclosure is to provide a fixing structure that facilitates inspection of bolts and nuts.

A fixing structure according to the present disclosure is a structure for fixing a stage structure to a columnar portion of a structure. The fixed structure protrudes from the columnar portion and includes a support beam for supporting the stage structure and a fastening structure for fastening the support beam to the stage structure. The tie structure has a side portion extending downwardly from the stage structure and a beam support portion having a lower portion located at the lower end of the side portion on which the support beam rests, and a tie member including bolts and nuts. An insert hole into which a bolt is inserted and a hole portion positioned at the lower end of the insert hole and into which a nut fastened to the bolt enters from below are formed in the lower portion of the beam support portion. The bore is defined by an inner surface against which the nut to be rotated abuts.

The fixed structure has columnar support beams that support the stage structure, and the support beams are fastened to the stage structure by a fastening structure. The tie structure includes a beam support for supporting the support beam and a tie member, the beam support having a side portion extending downwardly from the stage structure and a lower portion supporting the support beam at the lower end of the side portion. An insert hole and a hole positioned at the lower end of the insert hole are formed in the lower part of the beam support. The binding material has a bolt inserted into the insert hole and a nut fastened to the bolt in a hole formed at the lower end of the insert hole, and the hole is defined by the inner surface against which the rotating nut abuts. It is Therefore, after inserting the bolt into the insert hole from above and tightening the bolt with the nut fitted in the hole, even if the nut tries to rotate in the hole, the nut abuts against the inner surface of the hole. Rotation of the nut is restricted by contact with the inner surface. Therefore, since the nut does not become loose in the lower part of the support beam and the fastening structure, inspection of the bolt and nut from below is unnecessary. Therefore, since it is not necessary to set up a scaffold and inspect the bolts and nuts from below, it is possible to easily inspect the bolts and nuts.

The fastening structure may comprise a cap covering the nut and the bolt projecting downwardly from the nut. In this case, the cap can protect the bolt and nut protruding downward, so corrosion of the bolt and nut can be suppressed. Therefore, since it is unnecessary to inspect the bolts and nuts from below, the bolts and nuts can be inspected more easily.

According to the present disclosure, bolts and nuts can be easily inspected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an offshore wind power generator that is an example of a target to which a fixing structure according to an embodiment is applied; FIG. 2 is a side view showing the foundation and transition piece of the offshore wind turbine generator of FIG. 1; Figure 3 is a perspective view of the transition piece of Figure 2; FIG. 3 is a perspective view showing a ship landing facility of the transition piece of FIG. 2; 3 is a perspective view of the external platform of the transition piece of FIG. 2; FIG. 3 is a cross-sectional perspective view schematically showing each platform of the transition piece of FIG. 2; FIG. Figure 3 is a top perspective view of the external platform of the transition piece of Figure 2; Figure 3 is a bottom perspective view of the external platform of the transition piece of Figure 2; 9 is a perspective view showing the stage structure of the external platform of FIG. 8 and the support beams extending from the columnar portion; FIG. FIG. 10 is a perspective view showing a cap exposed on the upper side of the stage structure of FIG. 9; 11 is a perspective view showing bolts and nuts exposed by removing the cap of FIG. 10; FIG. FIG. 11 is a perspective view of the bolt and nut of FIG. 11 viewed from a direction different from that of FIG. 10; FIG. 10 is a perspective view showing a fastening structure for fastening a support beam to the stage structure of FIG. 9; 14 is a perspective view of the side and bottom portions of the cinch structure of FIG. 13; FIG. FIG. 15 is a cross-sectional view schematically showing bolts, nuts, and caps inserted through insert holes and holes formed in the lower portion of FIG. 14; 16 is a perspective view showing a state in which a cap is removed from the lower portion of FIG. 15; FIG. 16 is a perspective view of the hole of FIG. 15 as seen from below; FIG. 16 is a bottom view showing a nut fitted in the hole of FIG. 15; FIG. FIG. 4 is a perspective view showing a transition piece, a tower, and a straightening member according to an embodiment; 20(a) is a plan view showing the tilt correcting member of FIG. 19; FIG. 20B is a side view showing the tilt correcting member of FIG. 19; FIG.

Embodiments of the fixing structure according to the present disclosure will be described below with reference to the drawings. It should be noted that the present invention is not limited to the following examples, but is intended to include all modifications indicated in the scope of claims and within the scope of equivalents to the scope of claims. In the description of the drawings, the same reference numerals are given to the same or corresponding elements, and overlapping descriptions are omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated for easy understanding, and the dimensional ratios and the like are not limited to those described in the drawings.

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

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

The wind power 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 attached to the nacelle 5. a blade 6; The tower 4 is made of concrete or steel, for example. A generator, a speed increaser, and the like are accommodated inside the nacelle 5 . For example, a rotor shaft protrudes from the speed increaser to the outside of the nacelle 5 .

Blades 6 are fixed to the rotor shaft of nacelle 5 . The wind power generator 1 has, for example, three blades 6 . When the blades 6 are rotated by the wind, this rotation is increased to a constant rotation speed by the amplifier inside the nacelle 5, and this rotary motion is converted into electric power by the generator inside the nacelle 5. For example, the nacelle 5 is equipped with an anemometer, and efficiently generates power by controlling the orientation of the rotor and the angle of the blades 6 in accordance with the wind speed and direction.

The wind power generator 1 has, for example, a monopile foundation type, and a transition piece 3 is provided above a monopile foundation 2 . A wind power generator 1 includes a foundation 2 that is a monopile placed in water W, and a transition piece 3 that extends upward from the foundation 2 and is connected to the lower end of a tower 4 . The foundation 2 may be provided with a tri-pile type offshore wind foundation or a jacket type offshore wind foundation instead of the monopile foundation type, and the type of the foundation 2 is not particularly limited.

For example, a scouring prevention work 7 is provided around the foundation 2 on the seabed B, and the scouring 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 along a horizontal plane is circular. As an example, the base 2 has a tubular shape.

The foundation 2 has, for example, holes 2b through which water flows into and out of the foundation 2 . The diameter of the foundation 2 is, for example, 4 m or more (6 m as an example). The foundation 2 has, for example, a cylindrical lower portion 2c that is driven into the water W, and an upper portion 2d that gradually decreases in diameter as it goes upward from the upper end of the lower portion 2c. A transition piece 3 is installed on the upper portion 2d.

FIG. 3 is a perspective view showing the transition piece 3. FIG. The transition piece 3 is provided to ensure the verticality of the wind power generator 1 . As shown in FIGS. 2 and 3, the transition piece 3 has a tubular columnar portion 3b extending along the vertical direction D1, and an external platform 10 positioned at the upper end of the columnar portion 3b. The transition piece 3 corresponds to a structure having a columnar portion 3b.

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 downward from the lower end of the upper portion 3d. The external platform 10 is installed on the columnar portion 3b so as to horizontally protrude from the upper end of the columnar portion 3b.

A lower portion 3f of the transition piece 3 is a portion through which an upper portion 2d of the base 2 is passed. For example, the transition piece 3 is joined (grouted) to the foundation 2 by filling grout between the lower portion 3f and the upper portion 2d of the foundation 2 . Note that the means for joining the transition piece to the foundation is not limited to the grout joining described above. The means for joining the transition piece to the foundation may be, for example, bolt joining, and is not particularly limited. Also, a transition piece may be joined to the foundation in advance (for example, before being driven into the seabed B).

For example, the transition piece 3 comprises a ladder 3h for an operator to get on and off the column 3b and a rest platform 3j for the operator to rest. The ladder 3h, for example, extends from the lower portion 3f of the columnar portion 3b to the upper end of the columnar portion 3b. The transition piece 3 has, for example, a plurality of rest platforms 3j, each of which is provided at each of a plurality of intermediate portions of the ladder 3h.

4 is an enlarged perspective view of a part of the columnar portion 3b of the transition piece 3. FIG. As shown in Figures 3 and 4, the transition piece 3 has a wire line 3k and a grout line 3m. The electric wire piping 3k accommodates electric wires for ICCP (Impressed Current Cathodic Protection), for example.

The transition piece 3 has, for example, an electrode 3r arranged to protrude from the columnar portion 3b. The electrode 3r is the anode (external anode of the ICCP system) placed in the water W. Electric corrosion caused by the potential difference between the parts of the transition piece 3 is suppressed by the current flowing through the electrode 3r. The grout pipe 3m is a pipe through which the grout that fixes the transition piece 3 to the foundation 2 passes.

The transition piece 3 has a landing facility 3g on the columnar portion 3b. A ship on which workers who climb the transition piece 3 to work with the transition piece 3 board arrives at the landing facility 3g. The landing facility 3g includes, for example, two poles 3p extending along the vertical direction D1 and a plurality of joining members 3q joining the poles 3p to the columnar portion 3b.

Between the two poles 3p, the bow of the ship carrying the worker enters. For example, the distance between the two poles 3p is set wide enough for workers to access from the ship. A ladder 3h is provided between the two poles 3p. Therefore, it is possible for a worker who has come down from the ship to climb onto the external platform 10 of the transition piece 3 using the ladder 3h.

For example, a rest platform 3j is provided above the pole 3p. For example, the plurality of joint members 3q of the landing facility 3g are arranged along the pole 3p. The joint member 3q has, for example, a columnar shape protruding from the columnar portion 3b, and connects each pole 3p and the columnar portion 3b to each other. The pole 3p and the plurality of joint members 3q are integrated, for example.

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

The external platform 10 is provided at the upper end of the ladder 3h so that workers can enter the external platform 10 by climbing the ladder 3h. For example, crane 10b is a david crane and power supply 10c is a crane power supply that supplies power to crane 10b.

The tower 4 has an opening 4 b that allows access from the external platform 10 to the interior of the transition piece 3 and tower 4 . A worker can move into the transition piece 3 through the opening 4b. The opening 4b of the tower 4 is provided, for example, at a position higher than the lower end of the tower 4, and the worker can enter the opening 4b by climbing the stairs 10d in front of the opening 4b.

The transition piece 3 has, for example, a flange portion 3y (see FIG. 7) positioned at the upper end portion of the columnar portion 3b, and the tower 4 has a flange portion 4c positioned at its lower end. For example, the flange portion 3y of the transition piece 3 is a portion that protrudes radially outward and radially inward from the columnar portion 3b at the upper end of the columnar portion 3b, and the flange portion 4c of the tower 4 is a portion that protrudes radially inward from the columnar portion 3b at the lower end of the tower 4. These are portions that protrude outward in the direction and inward in the radial direction. However, for example, the flange portion of the transition piece 3 may be a portion that protrudes only radially inward of the columnar portion 3b at the upper end of the columnar portion 3b, and the flange portion 4c of the tower 4 is located at the lower end of the tower 4 along the diameter of the tower 4. It may be a part that protrudes only inward in the direction. Inside the transition piece 3 and the tower 4, a computer or the like for operating each device of the transition piece 3 and the tower 4 is arranged.

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) arranged along the circumferential direction D2 of the transition piece 3 and penetrating in the vertical direction D1. The tower 4 is joined to the transition piece 3 by inserting bolts through the through holes of the flange portion 3 y of the transition piece 3 and through the through holes of the flange portion 4 c of the tower 4 and tightening the bolts with nuts.

6 is an exploded perspective view showing the internal structure of the transition piece 3. FIG. As shown in Figure 6, the transition piece 3 comprises a platform 3c having a horizontally extending portion. The platform 3c includes the above-described external platform 10, a cable termination platform 20 for arranging a plurality of cables, an airtight platform 30 for blocking the inflow of air vertically upward, and above the joint 40A where the foundation 2 is joined. and a lower platform 40 located thereon. 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.

A cable termination platform 20 is provided below the external platform 10 and above the airtight platform 30 . Cable termination platform 20 is the platform where cables from underwater W are connected to cables of tower 4 .

An 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 circulation between the upper portion and the lower portion of the transition piece 3 . The airtight platform 30 has the function of keeping air out of the sea water.

The airtight platform 30 is made of, for example, carbon steel and is painted so as not to rust. Since the airtight platform 30 blocks air from the seawater, the internal space of the transition piece 3 above the airtight platform 30 can be made into an environment in which corrosion (rust, etc., does not readily occur).

The lower platform 40 is, for example, the platform on which the work of installing the transition piece 3 on the foundation 2 is performed. As an example, in the lower platform 40, grout is filled between the upper portion 2d of the foundation 2 and the lower portion 3f of the transition piece 3 (joint portion 40A), and the grout hardens to join the transition piece 3 to the foundation 2. work will be done to For example, the portion below the lower platform 40 of the transition piece 3 corresponds to the joint portion 40A joined to the foundation 2 .

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 arcuate portion 10A positioned directly above the columnar portion 3b of the transition piece 3 and a rectangular portion 10B projecting from the arcuate portion 10A. For example, crane 10b and power supply 10c are provided in rectangular section 10B.

The external platform 10 includes handrails 10 f provided along the outer edge of the external platform 10 . For example, the external platform 10 carries a plurality of packages 10g. For example, a handrail structure 50 is positioned 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 arranged inside the flange portion 3y of the external platform 10. As shown in FIG.

FIG. 8 is a perspective view of the external platform 10 viewed from below. The fixing structure 60 according to this embodiment is provided, for example, at the connecting portion between the columnar portion 3 b and the external platform 10 . The external platform 10 has a stage structure 11 projecting outwardly with respect to the columnar portion 3b. For example, the stage structure 11 includes an arcuate 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.

A plurality of first beams 12 extending in the longitudinal direction D3 of the stage structure 11, a plurality of second beams 13 extending in the lateral direction D4 of the stage structure 11, and a columnar portion are provided on the lower surface 11b of the stage structure 11. A plurality of third beams 14 extending radially outward of 3b are fixed. Furthermore, to the lower surface 11b of the stage structure 11, 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.

The fixed structure 60 includes a support beam 61 projecting from the columnar portion 3 b and a fastening structure 70 for fastening the support beam 61 to the stage structure 11 . Support beams 61 are 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 to the radially outer side of the columnar portion 3b.

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. As shown in FIG. The configuration of the second support beam 61B is, for example, the same as the configuration of the first support beam 61A. Therefore, hereinafter, the first support beam 61A and the second support beam 61B will be collectively described as the support beam 61 when there is no need to distinguish between them.

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

For example, the fastening structure 70 has an insert portion 74 extending from the side portion 71 between the support beam 61 and the first beam 12 and an upper end portion 75 positioned 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. FIG. 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 detachable. In the stage structure 11, the lower part of the stage structure 11 is visible when the grating 16 is removed, and the upper end portion 75 is exposed upward when the grating 16 is removed.

A cap 80 is provided on the upper end 75 . 11 is a perspective view showing a state in which the cap 80 is removed from the upper end portion 75. FIG. As shown in FIGS. 9-11, the binding structure 70 includes a binding member 78 including a bolt 76 and a nut 77, and the cap 80 protects the binding member 78 including the bolt 76 and nut 77. As shown in FIGS. The bolt 76 and nut 77 are exposed upward without the cap 80 .

FIG. 12 is a perspective view of the binding member 78 viewed from a direction different from that of FIG. FIG. 13 is a perspective view showing the tightening structure 70. FIG. As shown in FIGS. 12 and 13, the bolt 76 extends in the vertical direction D1 inside the side portion 71, and nuts 77 are fastened to the upper and lower ends of the bolt 76, respectively. For example, two nuts 77 are fastened to bolts 76 exposed at the upper end portion 75 , and washers 79 are interposed between the nuts 77 and the upper surface of the upper end portion 75 .

FIG. 14 is a perspective view showing the tightening structure 70. FIG. As shown in FIGS. 13 and 14, the binding structure 70 includes a pair of side portions 71 arranged along the width direction D5 of the support beam 61, a lower portion 72 connecting the lower ends of the pair of side portions 71, and a pair of and an insertion portion 74 extending in the width direction D5 between the side portions 71 of the . Further, the binding member 78 has two bolts 76 inserted through each side portion 71 and a plurality of nuts 77 fastened to the upper and lower ends of the bolts 76, respectively.

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 is removed from FIG. 14. FIG. As shown in FIGS. 15 and 16, the side portion 71 and the lower portion 72 are formed with insert holes 70b into which bolts 76 are inserted. For example, the insert holes 70b extend along the vertical direction D1. .

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

The cap 80 is made of resin, for example. 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 enhanced. The cap 80 has a cylindrical shape with a bottom (for example, a cylindrical shape with a bottom). The cap 80 has a first portion 81 into which the nut 77 is inserted and a second portion 82 into which the bolt 76 protruding from the nut 77 is screwed.

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

FIG. 17 is a perspective view of the hole 90 viewed from below. FIG. 18 is a diagram showing the outer shape of the hole 90 and the nut 77. As shown in FIG. As shown in Figures 17 and 18, the bore 90 is defined by an inner surface 91 against which the nut 77 about to rotate abuts. The hole portion 90 is defined by a plurality of inner surfaces 91 and a bottom surface 92 in which the insert hole 70b is formed.

The shape of the hole portion 90 viewed from below is, for example, the same shape as the shape of the nut 77 . Specifically, the hole portion 90 has a nut shape that is the same as the shape of the nut 77, for example. "Nut shape" indicates a shape that can restrict the rotation of the nut fitted in the hole. The "nut shape" does not have to be exactly 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.

For example, when the nut 77 is fitted into the hole 90 , each of the plurality of inner surfaces 91 of the hole 90 faces each of the outer surfaces 77 b of the nut 77 . As an example, the hole portion 90 has six inner surfaces 91 and the nut 77 has six outer surfaces 77b. there is By providing the hole portion 90 with the inner surface 91 formed as described above, the rotation of the nut 77 fitted in the hole portion 90 can be reliably restricted.

Next, the effects of the fixing structure 60 according to this embodiment will be described in detail. As shown in FIGS. 15-17, the fixed structure 60 comprises 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. As shown in FIGS. The binding structure 70 includes a beam support portion 73 for supporting the support beam 61 and a binding member 78. The beam support portion 73 has a side portion 71 extending downward from the stage structure 11 and a support beam 61 at the lower end of the side portion 71. a supporting lower portion 72;

The lower portion 72 of the beam support portion 73 is formed with an insert hole 70b and a hole portion 90 located at the lower end of the insert hole 70b. The binding material 78 has a bolt 76 inserted into the insert hole 70b and a nut 77 fastened to the bolt 76 in a hole 90 formed at the lower end of the insert hole 70b, and the hole 90 tends to rotate. It is defined by an inner surface 91 against which the nut 77 abuts.

Therefore, since the rotation of the nut 77 is restricted by the hole 90, the nut 77 does not become loose in the support beam 61 and the lower part 72 of the binding structure 70, so the bolt 76 and the nut 77 should be inspected from below. can be made unnecessary. Therefore, since it is not necessary to set up a scaffold and inspect the bolts 76 and the nuts 77 from below, the inspection work of the bolts 76 and the nuts 77 can be easily performed. Although it is necessary to inspect the bolt 76 and the nut 77 at the upper end portion 75, only the upper end portion 75 can be inspected in this embodiment.

In this embodiment, the fastening structure 70 comprises a cap 80 covering the nut 77 and the bolt 76 projecting downwardly from the nut 77 . Therefore, the bolt 76 and the nut 77 projecting downward can be protected by the cap 80, so corrosion of the bolt 76 and the nut 77 can be suppressed. Therefore, the necessity of inspecting the bolt 76 and the nut 77 from below can be further reduced, so that the inspection work of the bolt 76 and the nut 77 can be performed more easily.

The embodiments of the fixing structure according to the present disclosure have been described above. However, the fixing structure according to the present disclosure is not limited to the above-described embodiments, and may be appropriately modified within the scope of the claims. That is, the configuration, shape, size, number, material, and arrangement of each part of the fixing structure are not limited to the above-described embodiments and can be changed as appropriate.

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

The tilt 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 hole 4d in plan view matches the position of the insertion hole of the flange portion 3y in plan view.

FIG. 20(a) is a plan view showing the tilt correction member 100. FIG. FIG. 20(b) is a side view showing the tilt correction member 100. FIG. As shown in FIGS. 19, 20(a) and 20(b), the tilt correction member 100 has, for example, an annular shape. The inclination correction member 100 has insertion holes 101 through which bolts are inserted through the insertion holes 4d of the flange portion 4c and the insertion holes of the flange portion 3y. The inclination correcting member 100 has a plurality of insertion holes 101 , and the plurality of insertion holes 101 are arranged along the circumferential direction D<b>6 of the inclination correction member 100 . Two insertion holes 101 are arranged along the radial direction D7 of the tilt correction member 100. As shown in FIG.

The tilt 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 . Thus, the tilt 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 of the tower 4 with respect to the transition piece 3 is corrected by inserting the inclination correcting member 100 having the thick portion 104 and the thin portion 105 between the flange portion 3y and the flange portion 4c.

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

For example, in the previous embodiments, the fastening structure 70 was described as comprising side portions 71 , lower portion 72 , insert portion 74 , upper end portion 75 , bolts 76 and nuts 77 . The configuration of the binding structure is not limited to the above example and can be changed as appropriate. Also, the cap is not limited to the cap 80 having the first portion 81 and the second portion 82, and the material, shape, size, etc. can be changed as appropriate.

In the above embodiments, the fixing structure 60 provided on the stage structure 11 of the external platform 10 of the transition piece 3 has been described. However, fixed structures according to the present disclosure may also be fixed structures provided elsewhere, such as cable termination platform 20 . Further, in the above-described embodiment, the transition piece 3 having the landing facility 3g, the ladder 3h, the electric wire piping 3k, and the grout piping 3m has been described. However, the constituent elements of the transition piece are not limited to the above-described 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.

In the previous embodiments, the transition piece 3 of the wind power generator 1 comprising the foundation 2, the transition piece 3, the tower 4, the nacelle 5 and the blades 6 was described. However, the configurations of the foundation, transition piece, tower, nacelle, and blades are not limited to the above-described embodiments and can be changed as appropriate.

In the above-described embodiment, an example in which the structure having the columnar portion 3b is the transition piece 3 of the wind power generator 1 has been described. However, the fixing structure according to the present disclosure is also applicable to structures other than the transition piece 3 of the wind power generator 1 . Fixed structures according to the present disclosure are also applicable to other offshore structures, such as, for example, oil platforms, or structures other than offshore structures.

DESCRIPTION OF SYMBOLS 1... Wind power generator 2... Foundation 2b... Hole 3... Transition piece (structure) 3b... Columnar part 3c... Platform 3g... Landing facility 3h... Ladder 3j... Rest platform 3k... Electric wire piping 3m Grout piping 3p Pole 3q Joining member 3r Electrode 3x Ladder 3y Flange 4 Tower 4b Opening 4c Flange 5 Nacelle 6 Blade , 7... Anti-scouring work, 10... External platform, 10A... Circular part, 10b... Crane, 10B... Rectangular part, 10c... Power supply device, 10d... Stairs, 10f... Handrails, 10g... Loads, 11... Stage structure , 11b... lower surface, 12... first beam, 13... second beam, 14... third beam, 15... inner peripheral beam, 16... grating, 17... outer peripheral beam, 20... cable termination platform, 30... airtight platform , 40 ... lower platform, 40A ... joint portion, 50 ... handrail structure, 60 ... fixed structure, 61 ... support beam, 61A ... first support beam, 61B ... second support beam, 70 ... tightening structure, 70b ... insert hole, 71... Side part, 72... Lower part, 73... Beam support part, 74... Insertion part, 75... Upper end part, 76... Bolt, 77... Nut, 77 b... Outer surface, 78... Binding material, 79... Washer, 80... Cap, 81... First part 81b... Inner surface 81c... Bottom surface 82... Second part 83... Opening 90... Hole 91... Inner surface 92... Bottom surface 100... Tilt correction member 101... Insertion hole 102 Bottom surface 103 Top surface 104 Thick part 105 Thin part B Sea bottom D1 Vertical direction D2 Circumferential direction D3 Longitudinal direction D4 Transverse direction D5 Width direction W underwater.

Claims (2)

A structure for fixing a stage structure to a columnar portion of a structure,
a support beam projecting from the columnar portion and supporting the stage structure;
a fastening structure for fastening the support beam to the stage structure;
with
The tight structure is
a beam support having a side portion extending downwardly from the stage structure and a lower portion located at a lower end of the side portion on which the support beam rests;
a binding member including bolts and nuts;
The lower portion of the beam support portion is formed with an insert hole into which the bolt is inserted, and a hole portion positioned at the lower end of the insert hole into which the nut fastened to the bolt enters from below. ,
wherein the hole is defined by an inner surface against which the nut to be rotated abuts;
Fixed structure. The tightening structure includes a cap covering the nut and the bolt projecting downward from the nut,
The fixing structure according to claim 1.

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