Height adjustment method and height adjustment structure

Abstract

To provide a height adjustment method and height adjustment structure that enable stable installation of transition pieces on a foundation.SOLUTION: In one embodiment of a height adjustment method, a plurality of height adjustment devices 50 include one or more first height adjustment devices 60 with which a foundation is in contact, and three second height adjustment devices 70 with which the foundation is in contact at a lower position than the first height adjustment devices 60. The height adjustment method includes the processes of: installing one or more first height adjustment devices 60 and three second height adjustment devices 70 on the transition piece platform so that they are aligned along a circumferential direction D2 of the transition piece; making the foundation contact the three second height adjustment devices 70 from below; and making the first height adjustment devices 60 and the second height adjustment devices 70 contact the foundation to adjust inclination of the transition piece.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present disclosure relates to a height adjustment method and a height adjustment structure for adjusting the height of a transition piece installed on a foundation. [Background technology]

[0002] Japanese Patent No. 5993756 describes a method for installing an offshore structure. The offshore structure is an offshore wind power generation facility that includes a foundation that is inserted into the seabed, a superstructure that is installed on top of the foundation, and an outfitting member that is installed between the foundation and the superstructure. The outfitting member is also called a transition piece. The offshore wind power generation facility includes an angle adjustment member that can adjust the inclination angle of the superstructure relative to the vertical direction.

[0003] The angle adjustment member includes two shim plates interposed between the foundation and the superstructure, and a number of bolts and a number of nuts inserted into through holes formed in each shim plate. The inclination angle of the foundation with respect to the vertical direction is measured using an electro-optical range finder, a GPS, or the like. The shim plates are fabricated in advance to have an inclined surface that corrects the measured inclination angle. In this installation method, the inclination of the superstructure with respect to the vertical direction is corrected by interposing two shim plates having the inclined surface between the foundation and the superstructure.

[0004] Japanese Patent No. 6839524 describes a structure and method for supporting a leg of an overwater structure to a steel pipe pile. The overwater structure includes a steel pipe pile having a flange on its top surface that protrudes radially inward, and a tubular leg that is a transition piece that is placed on the steel pipe pile from above. The leg has an annular bracket that protrudes radially inward, and the leg is installed on the steel pipe pile by placing the bracket on the flange.

[0005] An adjustment member is provided between the upper surface of the flange of the steel pipe pile and the lower surface of the bracket of the leg to adjust the inclination of the leg relative to the vertical direction. The inclination angle of the upper surface of the flange of the steel pipe pile relative to the horizontal plane is measured in advance, and the adjustment member is fabricated to have an inclined surface with the measured inclination angle. By interposing this adjustment member with an inclined surface between the upper surface of the flange of the steel pipe pile and the lower surface of the bracket of the leg, the inclination of the leg relative to the vertical direction is corrected. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5993756 [Patent Document 2] Patent No. 6839524 Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-mentioned method for installing an offshore structure and the method for supporting the legs of a floating structure on steel pipe piles, the inclination angle must be measured in advance and a shim plate or adjustment material with an inclined surface must be prepared in advance, so the inclination of the transition piece cannot be adjusted efficiently. In addition, a method is known in which the transition piece is provided with multiple height adjustment members, and the multiple height adjustment members are placed on a foundation to adjust the inclination of the transition piece. However, since there is variation in the height of the parts of the multiple height adjustment members to which the foundation is applied due to dimensional errors, etc., a problem may arise in that the multiple height adjustment members cannot be stably placed on the foundation. As a result, there is a concern that the transition piece cannot be stably installed on the foundation.

[0008] The present disclosure aims to provide a height adjustment method and height adjustment structure that enable stable installation of a transition piece on a foundation. [Means for solving the problem]

[0009] The height adjustment method according to the present disclosure is a height adjustment method for adjusting the height of a cylindrical transition piece when the transition piece is installed on a foundation, using four or more height adjustment devices. The four or more height adjustment devices include one or more first height adjustment devices with which the foundation abuts, and three second height adjustment devices with which the foundation abuts at a position lower than the first height adjustment devices. This height adjustment method includes the steps of installing one or more first height adjustment devices and three second height adjustment devices on a platform of the transition piece so as to be aligned along the circumferential direction of the transition piece, abutting the three second height adjustment devices from below with the foundation, and adjusting the inclination of the transition piece by abutting the first height adjustment device and the second height adjustment device with the foundation.

[0010] In this height adjustment method, the height and inclination of the transition piece are adjusted using four or more height adjustment devices. By adjusting the height and inclination using four or more height adjustment devices, the height and inclination of the transition piece can be adjusted with high precision. The four or more height adjustment devices include a first height adjustment device with which the foundation abuts and a second height adjustment device with which the foundation abuts at a position lower than the first height adjustment device. One or more first height adjustment devices and three second height adjustment devices are installed so as to be aligned along the circumferential direction of the platform of the transition piece, and the foundation abuts against the three second height adjustment devices from below. Thereafter, the first height adjustment device and the second height adjustment device abut against the foundation to adjust the inclination of the transition piece. Therefore, since the foundation can be abutted against the three second height adjustment devices aligned along the circumferential direction of the platform before the inclination is adjusted, the transition piece can be stably placed on the foundation by three-point support. Furthermore, since the inclination of the transition piece is adjusted with the transition piece stably placed on the foundation, the transition piece can be stably installed on the foundation and the inclination can be adjusted in a stable state.

[0011] Each of the first height adjustment device and the second height adjustment device may have a bracket extending vertically downward. In the step of abutting the foundation, the foundation may abut against the lower surface of each bracket of the three second height adjustment devices. In this case, the brackets of the first height adjustment device and the second height adjustment device can be effectively used as the parts that the foundation abuts against. Furthermore, when the first height adjustment device and the second height adjustment device have a jack, the foundation can be abutted against the lower surface of the bracket before the jack, so that the load on the jack when placing the transition piece on the foundation can be reduced.

[0012] In the step of installing the height adjustment devices, three or more first height adjustment devices and three second height adjustment devices may be installed so as to be lined up along the circumferential direction of the transition piece. In this case, three or more first height adjustment devices and three second height adjustment devices are installed along the circumferential direction of the transition piece, so that the height and inclination of the transition piece can be adjusted with even higher precision using a total of six or more height adjustment devices.

[0013] Each of the first height adjustment device and the second height adjustment device may have an abutment member movable in the vertical direction. In the step of adjusting the inclination, the abutment member of the first height adjustment device and the abutment member of the second height adjustment device may be abutted against the foundation to adjust the inclination of the transition piece. In this case, the inclination of the transition piece is adjusted by multiple abutment members movable in the vertical direction, so that the height and inclination of the transition piece can be adjusted with even higher precision.

[0014] Each of the first height adjustment device and the second height adjustment device may have a jack that moves the abutment member in the vertical direction and a height fixing means that fixes the height of the abutment member. This height adjustment method may further include a step of fixing the height of each of the abutment members of the first height adjustment device and the second height adjustment device by the height fixing means after the step of adjusting the inclination of the transition piece. In this case, after the abutment member is abutted against the foundation to adjust the inclination of the transition piece, the height of the abutment member abutting against the foundation is fixed by the height fixing means. Therefore, since the height of the abutment member abutting against the foundation can be fixed by the height fixing means, even if a malfunction occurs in the jack that moves the abutment member in the vertical direction, it is possible to suppress the height of the abutment member from changing. Therefore, it is possible to more reliably maintain a stable state of the transition piece.

[0015] The height adjustment structure according to the present disclosure is a height adjustment structure that adjusts the height of a cylindrical transition piece when the transition piece is installed on a foundation by using four or more height adjustment devices. The four or more height adjustment devices include one or more first height adjustment devices having a bracket facing the foundation and three second height adjustment devices having a bracket against which the foundation abuts. The one or more first height adjustment devices and the three second height adjustment devices are installed so as to be aligned along the circumferential direction of the transition piece on the platform of the transition piece, and the height of the lower surface of the bracket of the second height adjustment device is lower than the height of the lower surface of the bracket of the first height adjustment device.

[0016] This height adjustment structure includes four or more height adjustment devices, and the four or more height adjustment devices include one or more first height adjustment devices and three second height adjustment devices. Since the height and inclination of the transition piece are adjusted by the four or more height adjustment devices, the height and inclination of the transition piece can be adjusted with high precision. The first height adjustment device includes a bracket facing the foundation, and the second height adjustment device includes a bracket abutting the foundation. One or more first height adjustment devices and three second height adjustment devices are installed so as to be aligned along the circumferential direction of the platform of the transition piece, and the height of the lower surface of the bracket of the second height adjustment device is lower than the height of the lower surface of the bracket of the first height adjustment device. Therefore, the foundation can be abutted against the lower surfaces of the brackets of the three second height adjustment devices aligned along the circumferential direction of the platform, so that the transition piece can be stably placed on the foundation by three-point support, as in the above-mentioned height adjustment method. Therefore, the transition piece can be stably installed on the foundation and the inclination of the transition piece can be adjusted in a stable state. Effect of the Invention

[0017] According to the present disclosure, a transition piece can be stably installed on a foundation. [Brief description of the drawings]

[0018] [Figure 1] 1 is a side view showing an offshore wind turbine power generation device which is an example of an application of a height adjustment method and a height adjustment device 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 showing a deviation correction jack of the transition piece of FIG. 2. [Figure 8] FIG. 3 is a perspective view showing the lower platform of the transition piece of FIG. 2. [Figure 9] FIG. 9 is a partial cross-sectional view showing a schematic view of the lower platform and foundation of FIG. 8. [Figure 10] FIG. 9 is a perspective view showing a height adjustment device disposed on the lower platform of FIG. 8. [Figure 11] 11 is a perspective view of the height adjustment device of FIG. 10, seen from a different direction than that of FIG. 10. [Figure 12] FIG. 2 is a perspective view showing a schematic installation state of a first height adjustment device and a second height adjustment device according to the embodiment. [Figure 13] FIG. 2 is a plan view showing a schematic installation state of a first height adjustment device and a second height adjustment device according to the embodiment. [Figure 14] 13(a) and 13(b) are plan views illustrating a schematic installation state of a first height adjustment device and a second height adjustment device according to a modified example. [Figure 15] 1A and 1B are perspective views showing a specific example of a misalignment correcting jack according to an embodiment of the present invention. [Figure 16] 1A and 1B are perspective views showing an example of a fixing structure of a misalignment correcting jack according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of a height adjustment method and a height adjustment structure according to the present disclosure will be described with reference to the drawings. 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 simplified or exaggerated for ease of understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0020] The height adjustment method and height adjustment device according to the present embodiment adjust the height of a cylindrical transition piece when the transition piece is installed on a foundation of an offshore structure by using four or more height adjustment devices. The offshore structure is, for example, a wind power generator. An example in which the height adjustment method and height adjustment device are applied to a wind power generator will be described below.

[0021] Fig. 1 is a side view showing a wind power generator 1 as an example to which a height adjustment method and height adjustment device according to this embodiment are 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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 Fig. 2 and Fig. 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.

[0028] 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.

[0029] 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).

[0030] 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.

[0031] 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).

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The transition piece 3 has, for example, a flange portion 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 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. Computers and the like that operate the devices of the transition piece 3 and the tower 4 are arranged inside the transition piece 3 and the tower 4.

[0040] The flange portion 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 of the transition piece 3 and each through hole of the flange portion 4c of the tower 4 and tightening the bolts with nuts.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.).

[0045] 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.

[0046] Fig. 7 is an enlarged perspective view of the lower end of the transition piece 3. As shown in Fig. 6 and Fig. 7, the transition piece 3 has a lower flange 3y that protrudes radially outward from the columnar portion 3b at the lower end of the transition piece 3, and a misalignment correction jack 90 attached to the lower surface of the lower flange 3y.

[0047] The misalignment correcting jack 90 expands and contracts along the radial direction of the columnar portion 3b, and adjusts the horizontality of the transition piece 3 relative to the foundation 2 (the inclination of the transition piece 3 relative to the vertical direction D1) by abutting against the outer surface of the foundation 2 located radially inside the columnar portion 3b. For example, the transition piece 3 includes multiple (six, for example) misalignment correcting jacks 90. The multiple misalignment correcting jacks 90 may be arranged in a line along the circumferential direction D2 of the columnar portion 3b. In this case, the multiple misalignment correcting jacks 90 move radially relative to the foundation 2, thereby making it possible to fine-tune the inclination of the transition piece 3 relative to the vertical direction D1 (the verticality of the transition piece 3).

[0048] Fig. 8 is a perspective view showing the lower platform 40. Fig. 9 is a cross-sectional view showing the lower platform 40 and the foundation 2. As shown in Figs. 8 and 9, the lower platform 40 has an annular shape with a hole 40b penetrating in the vertical direction D1. For example, the annular upper end surface 2f of the foundation 2 is located directly below the lower platform 40.

[0049] The lower platform 40 has a first handrail 41 extending upward from the hole 40b, a second handrail 42 that forms the outer edge of the lower platform 40 in a plan view, and an annular floor portion 43 located between the first handrail 41 and the second handrail 42 in a plan view. Furthermore, the lower platform 40 is provided with a plurality of height adjustment devices 50 that adjust the inclination and height of the transition piece 3 relative to the foundation 2.

[0050] The multiple height adjustment devices 50 are provided to ensure the verticality of the transition piece 3 installed on the foundation 2. The height adjustment devices 50 are also called centralizers that reduce the inclination of the transition piece 3 with respect to the vertical direction D1. The multiple height adjustment devices 50 are arranged in a line along the circumferential direction D2 of the lower platform 40.

[0051] The height adjustment device 50 has a lower surface 50b facing vertically downward, and an upper end surface 2f of the foundation 2 abuts against the lower surface 50b when the transition piece 3 is placed on the foundation 2. However, if the foundation 2 is tilted or there is a tolerance in the height of the lower surfaces 50b of the multiple height adjustment devices 50, there is a possibility that any of the lower surfaces 50b of the multiple height adjustment devices 50 may float from the upper end surface 2f, which may cause a problem in that the transition piece 3 becomes unstable.

[0052] In the height adjustment method according to this embodiment and the height adjustment structure 100 described later, the multiple height adjustment devices 50 include one or more first height adjustment devices 60 and three second height adjustment devices 70 described later, and the height of the lower surface 50b of the second height adjustment device 70 is lower than the height of the lower surface 50b of the first height adjustment device 60, thereby stabilizing the transition piece 3 and preventing the occurrence of the above problems. The height adjustment structure 100 according to this embodiment will be described below.

[0053] The height adjustment structure 100 includes one or more first height adjustment devices 60 and three second height adjustment devices 70, and the one or more first height adjustment devices 60 and the three second height adjustment devices 70 are arranged in a line along the circumferential direction D2 on the lower platform 40. In this embodiment, the three first height adjustment devices 60 and the three second height adjustment devices 70 are arranged in a line along the circumferential direction D2. For example, the first height adjustment devices 60 and the second height adjustment devices 70 are arranged alternately along the circumferential direction D2.

[0054] Fig. 10 is a perspective view showing the first height adjustment device 60. Fig. 11 is a perspective view showing the first height adjustment device 60 from a different direction than that of Fig. 10. As shown in Fig. 10 and Fig. 11, the first height adjustment device 60 includes a bracket 51 extending vertically downward, a contact member 52 movable along the vertical direction D1, a jack 53 for moving the contact member 52 in the vertical direction D1, and a height fixing means 54 for fixing the height of the contact member 52.

[0055] The bracket 51 includes a pair of side portions 51b, a connection portion 51c that connects the pair of side portions 51b to each other, and an installation portion 51z that connects the pair of side portions 51b to each other and on which the jack 53 and the height fixing means 54 are installed. The first height adjustment device 60 is disposed such that the pair of side portions 51b are aligned along the circumferential direction D2.

[0056] For example, the side portion 51b has a plate shape extending in the vertical direction D1 and in the radial direction D3 of the lower platform 40. As an example, the side portion 51b includes a fixed portion 51d fixed to the floor portion 43 of the lower platform 40, and a protruding portion 51f protruding outward in the radial direction D3 from an oblique upper portion of the fixed portion 51d.

[0057] As an example, the fixed portion 51d has a pair of main surfaces 51j aligned along the circumferential direction D2. The fixed portion 51d has a bottom surface 51g extending along the radial direction D3, a first end surface 51h extending upward from the inside of the bottom surface 51g in the radial direction D3, and a second end surface 51k extending obliquely upward from the outside of the bottom surface 51g in the radial direction D3. Furthermore, the fixed portion 51d has a third end surface 51m extending obliquely upward from the upper end of the first end surface 51h to the outside in the radial direction D3, and a fourth end surface 51p extending upward from the second end surface 51k.

[0058] The protruding portion 51f is a plate-shaped portion protruding outward in the radial direction D3 from the upper end of the third end face 51m and the upper end of the fourth end face 51p. The protruding portion 51f has a pair of main surfaces 51q aligned along the circumferential direction D2, a lower surface 50b extending outward in the radial direction D3 from the upper end of the fourth end face 51p, and an upper surface 51s extending outward in the radial direction D3 from the upper end of the third end face 51m. Furthermore, the protruding portion 51f has a fifth end face 51t extending in the vertical direction D1 between the outer side of the lower surface 50b in the radial direction D3 and the outer side of the upper surface 51s in the radial direction D3.

[0059] The upper surface 51s includes a flat surface 51v extending from the upper end of the third end surface 51m to the outside in the radial direction D3, and a curved surface 51w extending obliquely upward from the end of the flat surface 51v opposite the third end surface 51m. The lower surface 50b includes a flat surface 51x extending from the upper end of the fourth end surface 51p to the outside in the radial direction D3, and a curved surface 51y extending obliquely downward from the end of the flat surface 51x opposite the fourth end surface 51p. The lower surface 50b is a portion that faces the upper end surface 2f of the foundation 2 or that abuts against the upper end surface 2f of the foundation 2. For example, when the transition piece 3 is placed on the foundation 2, the flat surface 51x of the lower surface 50b faces (or abuts against) the upper end surface 2f of the foundation 2.

[0060] The connection portion 51c extends in the circumferential direction D2 between a pair of side portions 51b aligned along the circumferential direction D2. For example, the connection portion 51c has a plate shape having a thickness in the vertical direction D1 and a long side extending along the circumferential direction D2. The connection portion 51c extends in the circumferential direction D2 between the main surfaces 51j of the pair of side portions 51b.

[0061] The installation portion 51z extends in the circumferential direction D2 between a pair of protruding portions 51f aligned along the circumferential direction D2. For example, the installation portion 51z has a rectangular parallelepiped shape having long sides extending along the circumferential direction D2. The installation portion 51z extends in the circumferential direction D2 between the main surfaces 51q of the pair of protruding portions 51f. Examples of the shape and the like of the bracket 51 have been described above. However, the shape and the like of the bracket are not limited to the above examples and can be changed as appropriate.

[0062] The jack 53 is fixed to the lower surface of the installation portion 51z by, for example, bolt and nut connection. The jack 53 is, for example, a hydraulic jack. The abutment member 52 is fixed to the lower end of the jack 53 and moves along the vertical direction D1 as the jack 53 expands and contracts. The abutment member 52 is, for example, plate-shaped.

[0063] The abutment member 52 has an upper surface 52b to which the jack 53 is fixed, a lower surface 52c that abuts against the upper end surface 2f of the foundation 2, a first end surface 52d facing inward in the radial direction D3, a second end surface 52f facing outward in the radial direction D3, and a pair of third end surfaces 52g that face each of the main surfaces 51q of the bracket 51. For example, the upper surface 52b, the lower surface 52c, the second end surface 52f, and each of the third end surfaces 52g are flat surfaces. The first end surface 52d has, for example, a protruding portion 52h that protrudes inward in the radial direction D3 in a region including the center in the circumferential direction D2. A part of the height fixing means 54 is fixed to the upper surface 52b.

[0064] The height fixing means 54 has a bolt 54b that moves up and down with respect to the bracket 51 (installation portion 51z), a first nut 54c fastened to the bolt 54b on the lower surface of the installation portion 51z, a second nut 54d fastened to the bolt 54b on the upper surface of the installation portion 51z, and a washer 54f interposed between the upper surface of the installation portion 51z and the second nut 54d. Furthermore, the height fixing means 54 has an abutment portion 54g that is fixed to the upper surface 52b of the abutment member 52 and against which the bolt 54b abuts from above.

[0065] The installation portion 51z has a through hole through which the bolt 54b is inserted, and the bolt 54b extends in the vertical direction D1 in the through hole. The bolt 54b is, for example, a hexagonal bolt, and a head 54h of the bolt 54b faces upward. The bolt 54b is fastened to a second nut 54d located at the top of the installation portion 51z and a first nut 54c located at the bottom of the installation portion 51z.

[0066] The abutment portion 54g is provided below the bolt 54b. The lower end of the bolt 54b can be abutted against the abutment portion 54g by adjusting the degree to which the bolt 54b is screwed into the first nut 54c and the second nut 54d. When the bolt 54b abuts against the abutment portion 54g, the height of the abutment member 52 relative to the bracket 51 is fixed. For example, two of the height fixing means 54 described above are provided so as to be aligned along the circumferential direction D2. By providing two height fixing means 54 aligned along the circumferential direction D2, the height of the abutment member 52 can be fixed more reliably.

[0067] Above, specific examples of the configuration of each member of the first height adjustment device 60 have been described. However, the configuration of each member of the first height adjustment device 60 is not limited to the above example and can be changed as appropriate. The configuration of each member of the second height adjustment device 70 is, for example, similar to the configuration of each member of the first height adjustment device 60. Therefore, for the second height adjustment device 70, the description of the contents that overlap with the first height adjustment device 60 will be omitted. In addition, when there is no need to distinguish between the first height adjustment device 60 and the second height adjustment device 70, the first height adjustment device 60 and the second height adjustment device 70 may be collectively referred to as the height adjustment device 50.

[0068] 12, the height of the lower surface 50b of the second height adjustment device 70 is lower than the height of the lower surface 50b of the first height adjustment device 60. Therefore, when the transition piece 3 is first placed on the foundation 2, the upper end surface 2f of the foundation 2 comes into contact with the lower surface 50b of the second height adjustment device 70, but the upper end surface 2f of the foundation 2 does not come into contact with the lower surface 50b of the first height adjustment device 60.

[0069] Fig. 13 is a diagram showing a schematic arrangement of the height adjustment device 50 (the first height adjustment device 60 and the second height adjustment device 70) in a plan view. As shown in Fig. 12 and Fig. 13, the first height adjustment device 60 and the second height adjustment device 70 are arranged alternately along the circumferential direction D2, for example.

[0070] For example, the height adjustment structure 100 includes three first height adjustment devices 60 and three second height adjustment devices 70. The lower end of each second height adjustment device 70 is located below an imaginary horizontal plane S that includes the lower ends of the three first height adjustment devices 60. As an example, the height of the lower end of each second height adjustment device 70 is approximately 10 cm lower than the height of the imaginary horizontal plane S.

[0071] The three second height adjustment devices 70 are disposed at positions where the center of gravity G of the transition piece 3 is inside an imaginary triangle T connecting the three second height adjustment devices 70 in a plan view. The three second height adjustment devices 70 may be disposed at positions where the triangle T is an acute triangle or a right triangle. In this case, when the transition piece 3 is placed on the foundation 2, the lower surfaces 50b of the three second height adjustment devices 70 at three points abut against the upper end surface 2f of the foundation 2, so that the transition piece 3 can be stably placed on the foundation 2.

[0072] Next, a description will be given of a height adjustment method of this embodiment for adjusting the height of the transition piece 3 when installing the transition piece 3 on the foundation 2. First, one or more first height adjustment devices 60 and three second height adjustment devices 70 are installed along the circumferential direction D2 (step of installing the height adjustment devices).

[0073] For example, three first height adjustment devices 60 and three second height adjustment devices 70 are installed so that the first height adjustment devices 60 and the second height adjustment devices 70 are alternately arranged along the circumferential direction D2. Next, the foundation 2 is abutted against the three second height adjustment devices 70 from below (abutting the foundation step). At this time, the transition piece 3 is placed on the foundation 2 so that the upper end surface 2f of the foundation 2 abuts against the lower surfaces 50b of the brackets 51 of the three second height adjustment devices 70. At this point, the upper end surface 2f of the foundation 2 does not abut against the lower surfaces 50b of the first height adjustment devices 60, and the upper end surface 2f of the foundation 2 faces the lower surfaces 50b of the first height adjustment devices 60.

[0074] Thereafter, the first height adjustment device 60 and the second height adjustment device 70 are brought into contact with the foundation 2 to adjust the inclination of the transition piece 3 (a step of adjusting the inclination of the transition piece). Specifically, the abutment member 52 of the first height adjustment device 60 and the abutment member 52 of the second height adjustment device 70 are lowered vertically downward to bring each abutment member 52 into contact with the upper end surface 2f of the foundation 2, thereby adjusting the inclination of the transition piece 3 with respect to the foundation 2. At this time, the inclination of the transition piece 3 is adjusted so that the transition piece 3 extends along the vertical direction D1.

[0075] After the inclination of the transition piece 3 has been adjusted, the height of each abutment member 52 is fixed by the height fixing means 54 (step of fixing the height of the abutment members). Specifically, the bolt 54b of the height fixing means 54 is lowered so that the bolt 54b abuts against the abutment portion 54g, and the first nut 54c and the second nut 54d are fastened to the bolt 54b, thereby firmly fixing the height of the abutment member 52. Through the above steps, a series of steps is completed.

[0076] Next, a description will be given of the action and effect obtained from the height adjustment method and height adjustment structure 100 according to this embodiment. In the height adjustment method according to this embodiment, the height and inclination of the transition piece 3 are adjusted using four or more height adjustment devices 50. By adjusting the height and inclination using four or more height adjustment devices 50, the height and inclination of the transition piece 3 can be adjusted with high precision.

[0077] The four or more height adjustment devices 50 include a first height adjustment device 60 with which the foundation 2 abuts, and a second height adjustment device 70 with which the foundation 2 abuts at a position lower than the first height adjustment device 60. One or more first height adjustment devices 60 and three second height adjustment devices 70 are installed so as to be aligned along the circumferential direction D2 of the platform 3c (lower platform 40) of the transition piece 3, and the foundation 2 abuts against the three second height adjustment devices 70 from below. Thereafter, the first height adjustment device 60 and the second height adjustment device 70 abut against the foundation 2 to adjust the inclination of the transition piece 3.

[0078] Therefore, before the inclination is adjusted, the foundation can be abutted against the three second height adjustment devices 70 lined up in the circumferential direction D2 of the platform 3c, so that the transition piece 3 can be stably placed on the foundation 2 by three-point support. Then, the inclination of the transition piece 3 is adjusted in a state where the transition piece 3 is stably placed on the foundation 2, so that the transition piece 3 can be stably installed on the foundation 2 and the inclination adjustment can be performed in a stable state.

[0079] In this embodiment, each of the first height adjustment device 60 and the second height adjustment device 70 has a bracket 51 extending vertically downward. In the step of abutting the foundation 2, the foundation 2 abuts against the lower surface 50b of each of the brackets 51 of the three second height adjustment devices 70. Therefore, each of the brackets 51 of the first height adjustment device 60 and the second height adjustment device 70 can be effectively used as a portion with which the foundation 2 abuts.

[0080] In addition, when the first height adjustment device 60 and the second height adjustment device 70 have a jack 53, the foundation 2 can be abutted against the lower surface 50b of the bracket 51 before the jack 53, thereby reducing the load on the jack 53 when the transition piece 3 is placed on the foundation 2.

[0081] In this embodiment, in the process of installing the height adjustment devices 50, three or more first height adjustment devices 60 and three second height adjustment devices 70 are installed so as to be lined up along the circumferential direction D2 of the transition piece 3. In this case, three or more first height adjustment devices 60 and three second height adjustment devices 70 are installed along the circumferential direction D2 of the transition piece 3, so that the height and inclination of the transition piece 3 can be adjusted with even higher precision using a total of six or more height adjustment devices 50.

[0082] Each of the first height adjustment device 60 and the second height adjustment device 70 may have an abutment member 52 that is movable in the vertical direction D1. In the step of adjusting the inclination, the abutment member 52 of the first height adjustment device 60 and the abutment member 52 of the second height adjustment device 70 may be abutted against the foundation 2 to adjust the inclination of the transition piece 3. In this case, the inclination of the transition piece 3 is adjusted by the multiple abutment members 52 that are movable in the vertical direction D1, so that the height and inclination of the transition piece 3 can be adjusted with even higher precision.

[0083] In this embodiment, each of the first height adjustment device 60 and the second height adjustment device 70 has a jack 53 that moves the abutment member 52 in the vertical direction D1 and a height fixing means 54 that fixes the height of the abutment member 52. The height adjustment method according to this embodiment further includes a step of fixing the height of each of the abutment members 52 of the first height adjustment device 60 and the second height adjustment device 70 by the height fixing means 54 after the step of adjusting the inclination of the transition piece 3. Therefore, after the abutment member 52 is abutted against the foundation 2 to adjust the inclination of the transition piece 3, the height of the abutment member 52 abutting against the foundation 2 is fixed by the height fixing means 54. Therefore, since the height of the abutment member 52 abutting against the foundation 2 can be fixed by the height fixing means 54, even if a malfunction occurs in the jack 53 that moves the abutment member 52 in the vertical direction D1, it is possible to suppress the height of the abutment member 52 from changing. Therefore, the transition piece 3 can be more reliably maintained in a stable state.

[0084] The height adjustment structure 100 according to this embodiment includes four or more height adjustment devices 50, and the four or more height adjustment devices 50 include one or more first height adjustment devices 60 and three second height adjustment devices 70. Since the height and inclination of the transition piece 3 are adjusted by the four or more height adjustment devices 50, the height and inclination of the transition piece 3 can be adjusted with high precision.

[0085] The first height adjustment device 60 includes a bracket 51 facing the foundation 2, and the second height adjustment device 70 includes a bracket 51 abutting against the foundation 2. One or more first height adjustment devices 60 and three second height adjustment devices 70 are installed so as to line up along the circumferential direction D2 of the platform 3c of the transition piece 3, and the height of the lower surface 50b of the bracket 51 of the second height adjustment device 70 is lower than the height of the lower surface 50b of the bracket 51 of the first height adjustment device 60. Therefore, the foundation 2 can be abutted against the lower surfaces 50b of the brackets 51 of the three second height adjustment devices 70 lined up along the circumferential direction D2 of the platform 3c, so that the transition piece 3 can be stably placed on the foundation 2 by three-point support, as in the above-mentioned height adjustment method. Therefore, the transition piece 3 can be stably installed on the foundation 2, and the inclination of the transition piece 3 can be adjusted in a stable state.

[0086] The above describes the embodiments of the height adjustment method and the height adjustment structure according to the present disclosure. However, the height adjustment method and the height adjustment structure according to the present disclosure are not limited to the above-mentioned embodiments, and may be appropriately modified within the scope of the gist described in the claims. That is, the contents and order of the steps of the height adjustment method, and the configuration, shape, size, number, material and arrangement of each part of the height adjustment structure are not limited to the above-mentioned embodiments and can be appropriately modified.

[0087] For example, in the above embodiment, the height adjustment structure 100 including three first height adjustment devices 60 and three second height adjustment devices 70 has been described. However, as described above, for example, the number of first height adjustment devices 60 can be changed as appropriate. As shown in FIG. 14(a), the height adjustment structure 100A may include one first height adjustment device 60 and three second height adjustment devices 70. Also, as shown in FIG. 14(b), the height adjustment structure 100B may include nine first height adjustment devices 60 and three second height adjustment devices 70. In the example of FIG. 14(b), three first height adjustment devices 60 are arranged between two second height adjustment devices 70 adjacent to each other in the circumferential direction D2. However, the arrangement of the first height adjustment devices 60 is not limited to the above example and can be changed as appropriate.

[0088] In the above embodiment, a description has been given of a misalignment correcting jack 90 for a transition piece 3. Below, a specific example of the correcting jack 90 will be described with reference to Figures 15(a) and 15(b). As shown in Figures 15(a) and 15(b), the correcting jack 90 includes a jack body 91 and a fixing structure 92 that fixes the jack body 91.

[0089] The jack body 91 expands and contracts along the radial direction D4 of the transition piece 3, and adjusts the horizontality of the transition piece 3 with respect to the foundation 2 (the inclination of the transition piece 3 with respect to the vertical direction D1) by abutting against the outer surface of the foundation 2 located inside the radial direction D4 of the transition piece 3. The jack body 91 has, for example, a cylindrical shape extending along the radial direction D4 of the transition piece 3.

[0090] The fixing structure 92 has a pair of outer wall portions 93 aligned along the circumferential direction D5 of the transition piece 3 and arranged to sandwich the jack body 91 therebetween, and a first plate 94 and a second plate 96 aligned along the radial direction D4 between the pair of outer wall portions 93. The fixing structure 92 further has a base portion 98 on which the jack body 91 is placed, and a fixing member 95 that fixes the jack body 91 placed on the base portion 98.

[0091] The outer wall portion 93 has, for example, a plate shape in the vertical direction D1 and the radial direction D4. The first plate 94 is located outside the second plate 96 in the radial direction D4 of the transition piece 3. The first plate 94 and the second plate 96 extend in the vertical direction D1 and the circumferential direction D5. The first plate 94 has a through hole 94b through which the jack body 91 is inserted, and the through hole 94b penetrates the first plate 94 in the radial direction D4. In this embodiment, the diameter of the through hole 94b is larger than the diameter of a screw hole 96b described later and is larger than the diameter of a recess 98b described later. Therefore, the jack body 91 can be easily inserted into the through hole 94b.

[0092] The base portion 98 has a recess 98b recessed along the outer periphery of the jack body 91. As an example, the jack body 91 has a cylindrical shape, and the recess 98b is recessed in an arc shape. The fixing member 95 has a clamp portion 95b extending in the circumferential direction D6 of the jack body 91 along the outer periphery of the jack body 91, a bolt 95c that fixes the end of the clamp portion 95b in the circumferential direction D6 to the base portion 98, and a washer 95d interposed between the bolt 95c and the clamp portion 95b.

[0093] The bolt 95c and the washer 95d are provided on both ends of the clamp portion 95b in the circumferential direction D6. A hole is formed on each end of the clamp portion 95b, and the bolt 95c is passed through the hole and screwed into the base portion 98. This allows the fixing member 95 to firmly fix the jack body 91 to the base portion 98.

[0094] As shown in Figures 15(a), 15(b), 16(a) and 16(b), the second plate 96 has a screw hole 96b into which the jack body 91 passed through the first plate 94 is screwed. The jack body 91 has a screw portion 91b on its outer circumferential surface, and the screw portion 91b is screwed into the screw hole 96b. The upper surface of the recess 98b of the base 98 and the inner circumferential surface defining the screw hole 96b extend horizontally. Therefore, the jack body 91 placed on the recess 98b and screwed into the screw hole 96b extends horizontally. As described above, in the corrective jack 90, the jack body 91 can be fixed by the fixing structure 92 in a state in which it extends horizontally. Furthermore, the jack body 91 can be easily attached to the fixing structure 92, and the position and orientation of the jack body 91 can be stabilized.

[0095] In the above embodiment, as shown in Figures 10 and 11, a height adjustment device 50 including a bracket 51, abutment member 52, a jack 53, and height fixing means 54 has been described. The shapes, sizes, numbers, materials, and arrangements of the bracket 51, abutment member 52, jack 53, and height fixing means 54 are not limited to those of the height adjustment device 50 described above and can be changed as appropriate. For example, the height fixing means 54 can be omitted.

[0096] In the above embodiment, an example has been described in which the upper end surface 2f of the foundation 2 abuts against the lower surface 50b of the second height adjustment device 70, and then the abutting member 52 abuts against the upper end surface 2f. However, it is also possible to have the abutting member 52 of the second height adjustment device 70 abut against the upper end surface 2f of the foundation 2 first, and the configuration of the portion where the upper end surface 2f of the foundation 2 abuts can be changed as appropriate.

[0097] In the above embodiment, the transition piece 3 including the dock 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 3 are not limited to the above example of the transition piece 3 and can be appropriately changed. The structure of the platform 3c of the transition piece 3 can also be appropriately changed.

[0098] In the above-described embodiment, the transition piece 3 of the wind power generator 1 including the foundation 2, the transition piece 3, the tower 4, the nacelle 5, and the blades 6 has been described. 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. Furthermore, the height adjustment method and the height adjustment structure according to the present disclosure can be applied to structures other than the transition piece 3 of the wind power generator 1. The height adjustment method and the height adjustment device according to the present disclosure can be applied to other offshore structures such as oil platforms, or structures other than offshore structures, for example. [Explanation of symbols]

[0099] Reference Signs List 1...wind turbine, 2...foundation, 2b...hole, 2f...upper end surface, 3...transition piece, 3b...columnar portion, 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...lower flange, 4...tower, 4b...opening, 4c...flange portion, 5...nacelle, 6...blade, 7...scour prevention structure, 10...external platform, 10b...crane , 10c...power supply unit, 10d...staircase, 20...cable termination platform, 30...airtight platform, 40...lower platform, 40A...joint, 40b...hole, 41...first handrail, 42...second handrail, 43...floor, 50...adjustment device, 50b...lower surface, 51...bracket, 51b...side, 51c...connection, 51d...fixing portion, 51f...protrusion, 51g...bottom, 51h...first end surface, 51j...main surface, 51k...second end surface, 51m...third end surface, 51 p...fourth end surface, 51q...main surface, 51s...upper surface, 51t...fifth end surface, 51v...flat surface, 51w...curved surface, 51x...flat surface, 51y...curved surface, 51z...installation portion, 52...contact member, 52b...upper surface, 52c...lower surface, 52d...first end surface, 52f...second end surface, 52g...third end surface, 52h...projection portion, 53...jack, 54...height fixing means, 54b...bolt, 54c...first nut, 54d...second nut, 54f...washer, 54g...contact portion, 54h...head, 60...first height adjustment device position, 70...second height adjustment device, 90...misalignment correction jack, 91...jack body, 92...fixing structure, 93...outer wall portion, 94...first plate, 94b...through hole, 95...fixing member, 95b...clamp portion, 95c...bolt, 95d...washer, 96...second plate, 96b...screw hole, 98...base portion, 98b...recess, 100, 100A, 100B...height adjustment structure, B...seabed, D1...vertical direction, D2...circumferential direction, D3...radial direction, G...center of gravity, S...virtual horizontal plane, T...triangle, W...underwater.

Claims

1. A height adjustment method for adjusting a height of a cylindrical transition piece when the transition piece is installed on a foundation using four or more height adjustment devices, The four or more height adjustment devices include one or more first height adjustment devices with which the base abuts, and three second height adjustment devices with which the base abuts at a position lower than the first height adjustment devices, Installing one or more of the first height adjustment devices and three of the second height adjustment devices on a platform of the transition piece so as to be aligned along a circumferential direction of the transition piece; abutting the foundation from below against the three second height adjustment devices; a step of adjusting an inclination of the transition piece by abutting the first height adjustment device and the second height adjustment device against the foundation; A height adjustment method comprising:

2. Each of the first height adjustment device and the second height adjustment device has a bracket extending vertically downward, In the step of abutting the foundation, the foundation abuts against a lower surface of each of the brackets of the three second height adjustment devices. The height adjustment method according to claim 1 .

3. In the installing step, three or more of the first height adjustment devices and three of the second height adjustment devices are installed so as to be aligned along a circumferential direction of the transition piece. The height adjustment method according to claim 1 or 2.

4. Each of the first height adjustment device and the second height adjustment device has a contact member that is movable in a vertical direction, In the step of adjusting the inclination, the abutment member of the first height adjustment device and the abutment member of the second height adjustment device are brought into contact with the foundation to adjust the inclination of the transition piece. The height adjustment method according to any one of claims 1 to 3.

5. Each of the first height adjustment device and the second height adjustment device has a jack that moves the abutment member in a vertical direction and a height fixing means that fixes the height of the abutment member, the step of adjusting the inclination of the transition piece further includes a step of fixing the heights of the contact members of the first height adjustment device and the second height adjustment device by the height fixing means. The height adjustment method according to claim 4.

6. A height adjustment structure for adjusting the height of a cylindrical transition piece when the transition piece is installed on a foundation using four or more height adjustment devices, The four or more height adjustment devices include one or more first height adjustment devices having a bracket facing the base, and three second height adjustment devices having a bracket against which the base abuts; The one or more first height adjustment devices and the three second height adjustment devices are installed on a platform of the transition piece so as to be aligned along a circumferential direction of the transition piece, The height of the lower surface of the bracket of the second height adjustment device is lower than the height of the lower surface of the bracket of the first height adjustment device. Height adjustment structure.

Images