JP5993756B2 - Offshore structure and installation method of offshore structure - Google Patents

Description

  The present invention relates to a structure of a joint portion between a foundation of an offshore structure installed on the ocean and a superstructure, and an installation method of the offshore structure.

  For example, offshore wind power generation is known as an offshore structure installed on the ocean (for example, Patent Document 1). In this offshore wind power generation, it is installed by joining a superstructure in which a windmill and a tower are integrated to the upper part of a foundation having a steel pipe pile driven and fixed in the ground of the seabed.

  Here, the pile may be driven into the ground in a state of being inclined with respect to the vertical direction (horizontal direction) due to insufficient construction accuracy. If the superstructure is installed in this state, the installation inclination angle of the superstructure becomes larger than the required accuracy. For this reason, at present, the superstructure is installed while adjusting the inclination by joining a member called a transition piece provided at the lower end of the superstructure and the foundation with a grout material such as mortar.

JP 2009-281288 A

  However, the joining method using the grout material as described above is easy to correct the inclination of the superstructure with respect to the foundation, but it takes a long time to develop sufficient strength. It is a factor. Furthermore, workability is not good because the grout filling operation is performed offshore. Therefore, it is necessary to determine whether or not the bonding strength of the grout bonding is sufficient after the bonding operation, and in this respect, an increase in cost is inevitable.

  The present invention has been made in view of such circumstances, and provides an offshore structure and a method for installing an offshore structure that improve the workability of the installation work of the superstructure and reduce the cost. With the goal.

In order to solve the above problems, the present invention employs the following means.
That is, the offshore structure according to the present invention includes a foundation partly penetrating into the ground of the seabed, an upper work provided above the foundation, and the foundation and the upper work. And an angle adjusting member that can adjust an installation angle of the superstructure with respect to a vertical direction, and the angle adjusting member has at least two shim plates superimposed on a concentric shaft, and the shim Each of the plates is characterized in that one surface is inclined with respect to the other surface.

  According to such an offshore structure, even if the foundation is inclined with respect to the vertical direction, the superstructure can be provided in a state where the inclination of the foundation is corrected by using the angle adjusting member. More specifically, since each shim plate in the angle adjustment member is inclined with respect to one surface, the other shim plates are rotated relative to each other in a state where these shim plates are superimposed on a concentric axis. It is possible to adjust the inclination angle of the superstructure with respect to the vertical direction only by making it. In addition, by adjusting the angle according to the inclination angle of the foundation by rotating the shim plates relative to each other in this way, the angle adjustment member is attached to the superstructure in advance, so that the angle adjustment work of the superstructure on the ocean is performed. Is no longer necessary.

  In addition, the angle adjusting member includes two shim plates, and the two shim plates may have the same inclination angle at which the one surface is inclined with respect to the other surface. Good.

  As described above, the angle adjusting member is formed by superimposing two shim plates having the same inclination angle of one surface with respect to the other surface. If the circumferential position where the dimension is the minimum and the circumferential position where the thickness dimension is the maximum on the other shim plate are overlapped in the circumferential direction, the inclination angle of the superstructure relative to the foundation will be 0 degrees be able to. Therefore, when the foundation is constructed, it is possible to install the superstructure via the angle adjusting member even if the foundation is not inclined. Note that when the two shim plates are overlapped at the circumferential positions where the thickness dimensions are the smallest and at the circumferential positions where the thickness dimensions are both maximized, the inclination angle of the superstructure relative to the foundation is maximized. Can be.

  Furthermore, the said foundation has a 1st cylindrical part which makes the cylindrical shape in which the 1st flange part which protrudes toward an inner side from an inner peripheral surface was formed, and the said upper work is directed toward an inner side from an inner peripheral surface. It has the 2nd cylindrical part which makes the cylindrical shape in which the 2nd flange part which protrudes was formed, and these foundations by these 1st flange parts and the 2nd flange parts being joined via the angle adjustment member The superstructure may be provided at the top.

  Thus, by joining the first flange portion protruding inside the first cylindrical portion and the second flange portion protruding inside the second cylindrical portion via the angle adjusting member, for example, the first When the fastening bolt is used for joining the flange portion and the second flange portion, the fastening bolt is not exposed to the outside of the foundation and the upper work. Therefore, even if it is an offshore structure installed on the ocean, this fastening bolt will not be exposed to seawater or sea breeze, and a decrease in bonding strength due to the occurrence of rust or the like can be suppressed.

  Further, each of the shim plates in the angle adjusting member may be divided into a plurality in the circumferential direction.

  With such a divided shim plate, installation can be facilitated even if the shim plate is large.

  Furthermore, the offshore structure installation method according to the present invention includes a step of penetrating a part of the foundation into the ground of the seabed, a step of measuring an inclination angle of the foundation with respect to the vertical direction, and a concentric axis. A step of preparing an angle adjusting member having at least two shim plates whose one surface is inclined with respect to the other surface, and the at least two shim plates according to the inclination angle Adjusting the overlapping position between the upper work, and attaching the angle adjusting member to the upper work, and the upper part of the foundation via the angle adjusting member And a step of providing an upper work.

  According to such an offshore structure installation method, in order to provide the upper work on the foundation via the angle adjustment member, only by rotating each shim plate relative to each other with the shim plates superimposed on the concentric shaft, The inclination angle of the superstructure relative to the vertical direction can be adjusted. In addition, in the state where the shim plates are rotated relative to each other and the angle is adjusted according to the inclination angle of the foundation, the angle adjustment member is attached to the upper work in advance, so that the installation angle of the upper work on the ocean is reduced. Adjustment work becomes unnecessary.

  According to the offshore structure of claim 1, by providing the upper work on the foundation using the angle adjusting member made of shim plate, the offshore work at the time of the upper work installation can be reduced, the workability is improved and the cost is reduced. Can be suppressed.

  According to the offshore structure of the second aspect, it is possible to install the superstructure while widely responding to the inclination angle of the foundation.

  According to the offshore structure of Claim 3, durability can be improved in an offshore environment by joining a 1st flange part and a 2nd flange part via a joining member inside, and the reliability of a product. It leads to improvement in performance.

  According to the offshore structure of claim 4, by making the shim plate a split structure, the workability is further improved.

  According to the offshore structure installation method of the fifth aspect, the offshore work can be reduced by the angle adjusting member, and the cost can be reduced by improving the workability.

1 is an overall view of an offshore wind power generation facility according to a first embodiment of the present invention. It is sectional drawing which expands and shows an angle adjustment member periphery regarding the offshore wind power generation equipment which concerns on 1st embodiment of this invention. It is the top view which looked at the angle adjustment member from the direction of the 3rd axis line about the offshore wind power generation equipment concerning a first embodiment of the present invention. It is a figure which shows the installation method of the offshore wind power generation equipment which concerns on 1st embodiment of this invention to (a), (b), (c) in time series. It is a general view of the offshore wind power generation equipment which concerns on 2nd embodiment of this invention. It is a figure which shows the installation method of the offshore wind power generation equipment which concerns on 2nd embodiment of this invention to (a), (b), (c), (d) in time series. It is the top view which looked at the angle adjustment member from the direction of the 3rd axis line regarding the offshore wind power generation equipment which concerns on the modification of 1st embodiment and 2nd embodiment of this invention.

[First embodiment]
Hereinafter, the offshore wind power generation facility (offshore structure) 1 according to the first embodiment of the present invention will be described.
The offshore wind power generation facility 1 is a power generation facility that generates power by wind power offshore.

  As shown in FIG. 1, this offshore wind power generation facility 1 includes a foundation 2 penetrating into the ground 100 on the seabed, an upper work 3 provided on the upper part of the foundation 2, a foundation 2 and an upper work 3. An angle adjustment member 4 that is interposed between the base 2 and the upper work 3 and is provided between the foundation 2 and the upper work 3 so as to cover them. ing.

The foundation 2 is a so-called monopile type foundation 2, and is a steel pipe pile manufactured by a steel pipe centering on a first axis P <b> 1 partially penetrated into the seabed ground 100.
And as shown in FIG. 2, the foundation 2 is provided in the upper end of the pile main-body part 10 penetrated to the ground 100 of the seabed, and the pile main-body part 10, and it is an inner periphery toward the radial direction inner side of the 1st axis P1. It has the cylindrical upper end part 11 (1st cylindrical part) in which the 1st flange part 11a which protrudes cyclically | annularly from a surface was formed.
The first flange portion 11a is formed with a plurality of first through holes 11b penetrating in parallel with the first axis P1 at intervals in the circumferential direction of the first axis P1.

  The pile body 10 has a lower portion penetrating into the ground 100 with the seabed and an upper portion exposed on the sea surface 101, and is provided over the ground 100, the sea 102, and the sea surface 101.

  The superstructure 3 is a windmill tower in which a tower 15 and a windmill 16 provided at the top of the foundation 2 are integrated.

  The windmill 16 includes a nacelle 25 provided at an upper portion of the tower 15 and accommodating a generator and the like, and a blade 26 attached to the nacelle 25, and converts wind power into electric power.

  The tower 15 is manufactured by a steel pipe centering on the second axis P2 having an outer diameter and a wall thickness that are substantially the same as the outer diameter of the steel pipe pile that is the foundation 2.

As shown in FIG. 2, the tower 15 includes a tower main body 17 provided with the nacelle 25 of the wind turbine 16 and an inner circumference toward the radially inner side of the second axis P2 at the lower end of the tower main body 17. A second flange portion 18 a projecting annularly from the surface is formed, and has a lower end portion 18 (second cylindrical portion) that forms a cylindrical shape integrated with the tower main body portion 17.
The second flange portion 18a is formed with a plurality of second through holes 18b penetrating in parallel with the second axis P2 at intervals in the circumferential direction of the second axis P2.
In the present embodiment, the second flange portion 18a has substantially the same size and shape as the first flange portion 11a.

As shown in FIG. 1, the outfitting member 5 is provided over the outer peripheral surface of the tower 15 and the outer peripheral surface of the steel pipe pile that is the foundation 2, and includes various outfitting parts for performing maintenance work and the like. Yes.
In FIG. 2, the illustration of the fitting member 5 is omitted.

Next, the angle adjusting member 4 will be described.
As shown in FIG. 2, the angle adjustment member 4 has two shim plates 20 superimposed on a concentric axis.

  Each of the shim plates 20 has an annular shape around the third axis P3, and the cross section including the third axis P3 has a trapezoidal shape, that is, one surface (the surface facing downward) is the other surface (the upper surface). It is an inclined shim that is inclined with respect to

Further, in this embodiment, the shim plate 20 has the same shape with the minimum thickness dimension L1 and the maximum thickness dimension L2, and the two shim plates 20 are thick. The angle adjustment member 4 is configured by being vertically overlapped with each other in the circumferential position where the dimension is the smallest and in the circumferential position where the dimension is the largest.
Here, being superimposed on the concentric axis means that the third axis P3 is aligned on the overlapping surface 20a which is the upper surface of the lower shim plate 20 (20A) and the lower surface of the upper shim plate 20 (20B). It means that they are overlaid so that their positions match.

  Further, as shown in FIGS. 2 and 3, the shim plate 20 is formed with a plurality of third through holes 20b penetrating in parallel with the third axis P3 at intervals in the circumferential direction of the third axis P3. Yes.

  Then, the first axis P1 at the upper end 11 of the foundation 2 and the third axis P3 at the lower shim plate 20 (20A) are coaxial, and the second axis P2 at the lower end 18 of the upper work 3 1st penetration in each member in the state where the steel pipe pile which is foundation 2, tower 15, and angle adjustment member 4 are arranged so that the 3rd axis P3 in the upper shim board 20 (20B) may become coaxial. The hole 11b, the second through hole 18b, and the third through hole 20b communicate with each other. And the bolt 28 is penetrated so that these may be penetrated, the 1st flange part 11a and the 2nd flange part 18a are joined via the angle adjustment member 4 by fastening the bolt 28 and the nut 29, and a foundation 2 is provided with a superstructure 3.

  Accordingly, the diameter of the bolt 28 is determined in consideration of the shape of the shim plate 20 so as not to interfere with the inner surfaces of the first through hole 11b, the second through hole 18b, and the third through hole 20b. Conversely, the inner diameters of the first through hole 11b, the second through hole 18b, and the third through hole 20b need to be selected so as not to interfere with the bolt 28.

Next, with reference to FIG. 4, the installation method of the offshore wind power generation facility 1 is demonstrated.
The installation method of the offshore wind power generation facility 1 includes a foundation installation process for providing the foundation 2, an angle measurement process for measuring the inclination angle of the foundation 2 provided in the foundation installation process, and a member preparation process for preparing the angle adjusting member 4. An angle adjustment process for adjusting the angle of the angle adjustment member 4, a member attachment process for attaching the angle adjustment member 4 to the upper work 3, and an upper work installation process for providing the upper work 3 with the angle adjustment member 4 attached to the foundation 2. I have.

  First, the foundation installation process is executed. That is, as shown in FIG. 4A, using a crane or the like (not shown), the lower part of the pile body 10 of the steel pipe pile that is a part of the foundation 2 is inserted into the ground 100 in the direction of the thick arrow, Moreover, the base 2 is provided so that the upper end part 11 in which the upper part of the pile main-body part 10 and the 1st flange part 11a were formed is exposed on the sea surface 101. FIG.

  Next, an angle measurement process is performed. That is, as shown in FIG. 4B, the inclination angle α with respect to the vertical direction of the steel pipe pile as the foundation 2 is measured using, for example, a light wave range finder, GPS, or the like.

Next, a member preparation process is performed. That is, the angle adjusting member 4 described above is prepared.
And an angle adjustment process is performed. That is, according to the inclination angle of the foundation 2 measured in the angle measurement process, the two shim plates 20 in the angle adjusting member 4 are relatively rotated on the same axis to adjust the overlapping position, and the upper shim plate 20 (20B ) In the direction of the third axis P3 is the vertical direction. At this time, the positions of the shim plates 20 are adjusted so that the third through holes 20b of the two shim plates 20 communicate with each other. Thus, the angle adjustment of the shim plate 20 is not performed offshore, and the angle adjustment operation is completed in advance.

  Next, a member attachment process is performed. That is, as shown in FIG. 4 (c), the angle adjustment member 4 in which the upper work 3 is disposed above the foundation 2 and the angle adjustment is performed on the lower end portion 18 of the tower 15 of the upper work 3 in the angle adjustment step. Attach with a temporary fix. At this time, the outfitting member 5 is also attached on the outer peripheral surface of the tower 15.

  Finally, the superstructure installation process is executed. That is, the angle adjusting member 4, the superstructure 3, and the fitting member 5 are integrally provided on the foundation 2 using a crane or the like (not shown), and finally the state shown in FIG. 1 is obtained. More specifically, as described above, the first flange portion 11a and the second flange portion 18a are joined via the angle adjusting member 4 by fastening the bolt 28 and the nut 29, and the upper work 3 The upper work 3 is provided on the upper part of the foundation 2 by adjusting the second axis P2 to be parallel to the vertical direction.

  In such an offshore wind power generation facility 1, when the steel pipe pile that is the foundation 2 is provided, even if the steel pipe pile is inclined with respect to the vertical direction, the angle adjusting member 4 is used. The superstructure 3 can be provided with the inclination corrected.

  More specifically, since each of the shim plates 20 in the angle adjusting member 4 is inclined with respect to one surface, the shim plates 20 are superposed on the concentric axes. Only by rotating 20 relatively, the inclination angle of the superstructure 3 with respect to the vertical direction can be adjusted.

  In addition, by attaching the angle adjusting member 4 to the upper work 3 in advance in a state where the shim plates 20 are relatively rotated in this manner and the angle is adjusted according to the inclination angle of the steel pipe pile as the foundation 2, The angle adjustment work of the superstructure 3 is not necessary.

  Here, in order to provide the upper work 3 on the upper part of the foundation 2 by joining the first flange part 11a and the second flange part 18a via the angle adjusting member 4, between the foundation 2 and the upper work 3 There is no need to provide a transition piece and grout joining, and the superstructure 3 can be easily provided.

In addition, since the two shim plates 20 having the same shape are overlapped in the angle adjusting member 4, the circumferential direction in which the thickness dimension of the upper shim plate 20 is the minimum thickness L1 when performing the angle adjustment. By overlapping the position and the circumferential position where the thickness dimension of the lower shim plate 20 is the maximum thickness L2 in the circumferential direction, the inclination angle of the superstructure 3 with respect to the foundation 2 is set to 0 degree. can do.
Therefore, when the foundation 2 is constructed, it is possible to install the superstructure 3 via the angle adjustment member 4 even if the construction accuracy is high and the foundation 2 is not inclined.
As in the present embodiment, when the thickness dimensions of the two shim plates 20 are overlapped with each other in the circumferential position where the minimum thickness L1 and the circumferential position where the maximum thickness L2 are overlapped, The inclination angle of the superstructure 3 with respect to the foundation 2 can be maximized.
That is, the superstructure 3 can be installed while widely responding to the inclination angle of the foundation 2.

  Furthermore, since the first flange portion 11 a protrudes inside the upper end portion 11 of the steel pipe pile as the foundation 2 and the second flange portion 18 a protrudes inside the lower end portion 18 of the tower 15, the angle adjusting member 4. When the first flange portion 11a and the second flange portion 18a are joined together, the bolt 28 and the nut 29 are not exposed to the outside of the foundation 2 and the upper work 3. Therefore, even if installed on the ocean, the bolts 28 and nuts 29 are not exposed to seawater or sea breeze, and a decrease in bonding strength due to the occurrence of rust or the like can be suppressed. Therefore, durability can be improved, leading to improvement in product reliability.

  According to the offshore wind power generation facility 1 of the present embodiment, the superstructure 3 is provided on the foundation 2 using the angle adjusting member 4 configured by superimposing two shim plates 20. Offshore work can be reduced, and work efficiency can be improved and costs can be reduced.

[Second Embodiment]
Next, the offshore wind power generation facility 31 according to the second embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the same component as 1st embodiment, and detailed description is abbreviate | omitted.
In this embodiment, the foundation 32 is different from the first embodiment.

  As shown in FIG. 5, the foundation 32 is a so-called jacket-type foundation, and is provided in the upper part of the steel pipe pile 34 and the steel pipe pile 34 that penetrates into the ground 100 of the seabed and the upper part is located in the sea 102. And a jacket portion 33.

  The steel pipe pile 34 is substantially the same member as the pile main body portion 10 of the first embodiment, and a plurality (four in this embodiment) are spaced apart from each other according to the shape of the jacket portion 33 described later. It is penetrated into 100.

  The jacket portion 33 includes a main body portion 35 made of a steel pipe, a plurality of leg posts 36 extending downward from the main body portion 35, and an upper end portion (first cylindrical portion) provided on the upper portion of the main body portion 35 to form a cylindrical shape. 37).

  The main body 35 has a steel truss structure.

  In the present embodiment, four pedestal columns 36 are provided, and the jacket portion 33 is fixed to the steel pipe pile 34 by being grouting to each steel pipe pile 34 penetrating into the ground 100.

  The upper end portion 37 is substantially the same member as the upper end portion 11 of the foundation 2 of the first embodiment, and a first flange portion 11a is formed, and through the angle adjusting member 4 as in the first embodiment, The first flange portion 11 a and the second flange portion 18 a in the tower 15 are joined by a bolt 28 and a nut 29, whereby the upper work 3 is provided on the foundation 32.

Next, with reference to FIG. 6, the installation method of the offshore wind power generation equipment 31 is demonstrated.
The installation method of the offshore wind power generation facility 31 includes a foundation installation process, an angle measurement process, a member preparation process, an angle adjustment process, a member attachment process, and an upper work installation process, as in the first embodiment. ing.

First, the foundation installation process is executed. That is, as shown in FIG. 6A, the lower part of the steel pipe pile 34 in the foundation 32 is penetrated into the ground 100 in the direction of the thick arrow using a crane or the like (not shown), and the upper part of the steel pipe pile is in the sea 102. Provide to be located.
Then, as shown in FIG. 6 (b), the pedestal 36 of the jacket portion 33 in the foundation 32 is grouted to the upper portion of each steel pipe pile 34 penetrating into the ground 100 using a crane (not shown). The jacket portion 33 is fixed to the steel pipe pile 34.

  Next, an angle measurement process is performed. That is, as shown in FIG. 6C, the inclination angle α of the upper end portion 37 of the jacket portion 33 with respect to the vertical direction is measured using, for example, a light wave range finder or GPS.

Next, a member preparation process is performed. That is, the angle adjusting member 4 described in the first embodiment is prepared.
And an angle adjustment process is performed. That is, the overlapping position of the two shim plates 20 is adjusted, but the angle adjustment of the shim plate 20 is not performed offshore, and the angle adjustment operation is completed in advance.

  Next, a member attachment process is performed. That is, as shown in FIG. 6D, the upper work 3 is disposed above the foundation 32, and the angle adjusting member 4 is attached to the lower end portion 18 of the tower 15 in the upper work 3 by temporary fixing or the like.

  Finally, the superstructure installation process is executed. That is, the angle adjusting member 4, the superstructure 3, and the fitting member 5 are integrally provided on the foundation 32, and the state shown in FIG.

  According to the offshore wind power generation facility 31 of the present embodiment, since the superstructure 3 is provided via the angle adjusting member 4 configured by superimposing the two shim plates 20, the steel pipe is inserted after the steel pipe pile 34 is penetrated. Even if the jacket portion 33 is fixed to the steel pipe pile 34 as it is without correcting the inclination of the pile 34, the superstructure 3 can be provided with the inclination of the foundation 32 corrected. In other words, the angle adjustment in the sea 102 is not necessary, and the adjustment work is performed only in the air. Therefore, the offshore work when the superstructure 3 is installed can be reduced, and the work efficiency can be improved and the cost can be reduced. It becomes.

Although the embodiment of the present invention has been described in detail above, some design changes can be made without departing from the technical idea of the present invention.
For example, as shown in FIG. 7, instead of the respective shim plates 20 in the angle adjusting member 4, shim plates 40 divided into a plurality (four in FIG. 7) in the circumferential direction of the third axis P3 are provided. It may be used. Thus, by making the shim plate 40 into a divided structure, workability can be improved when the size of the shim plate 40 is large.

  Furthermore, in the angle adjusting member 4, the two shim plates 20 (40) are overlapped, but the angle can be adjusted if there are at least two shim plates 20 (40). Good.

  Further, the shim plate 20 (40) does not necessarily have an annular shape, and may be, for example, a disk shape or a polygonal plate shape.

  In the above-described embodiment, the offshore wind power generation facilities 1 and 31 have been described as an example. However, the angle adjustment member 4 may be applied to other offshore structures such as a resource mining platform and a mooring facility. Well, it is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 1 ... Offshore wind power generation equipment (offshore structure) 2 ... Foundation 3 ... Superstructure 4 ... Angle adjustment member 5 ... Fitting member 10 ... Pile main-body part 11 ... Upper end part (1st cylindrical part) 11a ... 1st flange part 11b ... 1st through-hole 15 ... Tower 16 ... Windmill P1 ... 1st axis P2 ... 2nd axis P3 ... 3rd axis 17 ... Tower main-body part 18 ... Lower end part 18a ... 2nd flange part 18b ... 2nd through-hole 20 (20A 20B) ... Shim plate 20a ... Overlapping surface 20b ... Third through hole 25 ... Nacelle 26 ... Blade 31 ... Offshore wind power generation facility 32 ... Foundation 33 ... Jacket part 34 ... Steel pipe pile 35 ... Main body part 36 ... Leg pillar 37 ... Upper end portion (first cylindrical portion) 40 ... Shim plate 100 ... Ground 101 ... Sea surface 102 ... Underwater

Claims (5)

A foundation that is partially penetrated into the seabed ground;
Superstructure provided on top of the foundation;
An angle adjusting member that is interposed between the foundation and the superstructure, and is capable of adjusting an installation angle of the superstructure relative to a vertical direction;
With
The angle adjusting member has at least two shim plates superimposed on a concentric shaft,
Each of the shim plates is an offshore structure characterized in that one surface is inclined with respect to the other surface. The angle adjusting member has two shim plates,
The offshore structure according to claim 1, wherein the two shim plates have the same inclination angle at which the one surface is inclined with respect to the other surface. The foundation has a first cylindrical portion having a cylindrical shape in which a first flange portion protruding inward from an inner peripheral surface is formed,
The superstructure has a second cylindrical portion having a cylindrical shape in which a second flange portion projecting inward from the inner peripheral surface is formed,
The said superstructure is provided in the said foundation by joining these 1st flange parts and 2nd flange parts via the said angle adjustment member, The offshore of Claim 1 or 2 characterized by the above-mentioned. Structure.   4. The offshore structure according to claim 1, wherein each of the shim plates in the angle adjusting member is divided into a plurality in the circumferential direction. 5. A process of penetrating a part of the foundation into the seabed ground,
Measuring an inclination angle with respect to a vertical direction of the foundation;
Providing an angle adjusting member having at least two shim plates that are superimposed on a concentric axis and one surface is inclined with respect to the other surface;
Adjusting the overlapping position between the at least two shim plates according to the inclination angle;
A process of arranging an upper work above the foundation and attaching the angle adjusting member to the upper work;
Providing the superstructure via the angle adjusting member on the top of the foundation;
The installation method of the offshore structure characterized by providing.

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