Seismic damping structure for tower-like structures and method for constructing tower-like structures with seismic damping structures

Abstract

To provide a vibration control structure of a tower-like structure capable of improving vibration-damping properties overall a tower-like structure such as offshore wind power generation equipment while reducing the load to a cylindrical foundation of a monopile foundation such as offshore wind power generation equipment due to earthquake motion, etc., and a construction method of a tower-like structure with vibration control structure.SOLUTION: A vibration control structure 8 of a tower-like structure 3 includes: multiple pile-shaped bodies 10,10 penetrated into the underwater ground 1 around the tower-like structure; and a superstructure 11 with polygonal frame shape in plan view having a beam part 11a bridged between adjacent pile-shaped bodies 10,10. The tower-like structure 3 is erected within the framework of superstructure 11, the superstructure 11 and the tower-like structure are connected by multiple seismic damping connections 12, 12.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a seismic isolation structure for a tower-shaped structure such as an offshore wind power generation device and a method for constructing a tower-shaped structure with a seismic isolation structure.

Background Art

[0002] One aspect of offshore wind power generation facilities includes a monopile foundation composed of a cylindrical body for foundation penetrated into the seabed ground, and a tower main body portion supported at the lower end by the cylindrical body for foundation, and a wind power generation device composed of a windmill (nacelle·rotor) etc. is supported at the upper end portion of the tower main body portion (for example, refer to Patent Document 1).

[0003] The monopile foundation is widely used as the foundation of a fixed-type offshore wind power generation device in Europe etc. because it is general and inexpensive, but in Japan where earthquakes occur frequently, the influence of seismic motion on the monopile foundation serving as its foundation is large. Especially when installed in waters with a large water depth, there is a possibility that large deformation may occur in the monopile foundation due to seismic motion, so the design of this type of tower-shaped structure is carried out strictly.

[0004] That is, in this type of tower-shaped structure, the lower part is penetrated and supported by the ground, and large bending moments and shear forces act during an earthquake etc. Therefore, in order to ensure safety, it is necessary to increase the outer diameter and wall thickness of the monopile which is the foundation part of the tower-shaped structure in advance so as to be able to resist the bending moment and shear force.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, with the conventional technology described above, there is a problem in that the manufacturing cost and construction cost of the monopile, which is the foundation of the tower-like structure, increase as the outer diameter and wall thickness of the monopile increase.

[0007] Furthermore, as monopiles become larger, it becomes necessary to use special work vessels for handling and driving them into the ground. Additionally, driving the monopiles takes more time, leading to increased costs, longer construction periods, and higher safety risks in the construction of monopil foundations.

[0008] In particular, monopile foundations, being single-pile foundations, carry the risk of excessive loads due to resonance with the ground depending on the soil conditions. However, because of their simple structure and shape, it is difficult to reduce seismic loads through design modifications such as shape adjustments, even if excessive loads occur.

[0009] Therefore, in order to mitigate the increased costs, longer construction periods, and safety risks associated with the construction of monopile foundations due to the increasing size of monopiles, it is desirable to reduce the load on tower-like structures caused by seismic activity and other factors, and to reduce the outer diameter and wall thickness of the monopiles.

[0010] Therefore, in view of these conventional problems, the present invention aims to provide a seismic damping structure for tower-like structures and a method for constructing a tower-like structure with a seismic damping structure that can improve the seismic damping performance of the entire tower-like structure such as offshore wind power generation facilities and reduce the load on the cylindrical foundation body such as monopile foundations of offshore wind power generation facilities caused by seismic motion and the like. [Means for solving the problem]

[0011] The invention described in claim 1, which solves the conventional problems described above, is a seismic damping structure for a tower-like structure erected on the seabed ground in a state in which it is penetrated into the seabed ground, comprising a plurality of pile-like bodies erected on the seabed ground in a state in which it is penetrated into the seabed ground around the tower-like structure, and a superstructure that is polygonal in plan view and has beam sections to be erected between the pile-like bodies, wherein the tower-like structure is erected within the frame of the superstructure.Furthermore, multiple sets of seismic damping connectors, which are spaced apart in the vertical direction, are provided in the circumferential direction. Applicable Of the multiple seismic damping connectors arranged at intervals in the vertical direction, the upper seismic damping connectors are connected to the superstructure and the tower-like structure at both ends in the horizontal direction, while the lower seismic damping connectors are connected to the superstructure and the tower-like structure at both ends in an inclined arrangement where the superstructure side is lower than the tower-like structure side. The superstructure and the tower-like structure are multiple The aforementioned The key feature is that they are connected by seismic damping connectors.

[0012] Claim 2 The features of the invention described are, Claim 1 In addition to the above configuration, the tower-like structure and the superstructure are fixed to a connector that detachably connects the end of the seismic damping connector.

[0013] Claim 3 The features of the invention described are, Claim 1 In addition to the above configuration, the seismic damping connector is composed of dampers.

[0014] Claim 4 The features of the invention described are, Claim 2 In addition to the above configuration, the seismic damping connector is composed of dampers.

[0015] Claim 5 The features of the invention described herein are a tower structure erection step of erecting a tower structure or a part thereof in a state in which it is penetrated into the seabed ground; a pile driving step of driving a plurality of pile-like bodies in a state in which they are penetrated into the seabed ground around the tower structure; and a superstructure installation step of installing a polygonal frame-shaped superstructure having beam sections to be erected between the pile-like bodies. Multiple seismic damping connectors are arranged in multiple sets in the circumferential direction, with spacing between them in the vertical direction. Applicable A seismic damping connector installation process is performed in which, among a plurality of seismic damping connectors arranged at intervals in the vertical direction, the upper seismic damping connectors are oriented horizontally and connected at both ends to the superstructure and the tower-like structure, and the lower seismic damping connectors are oriented so that both ends are lower on the superstructure side than on the tower-like structure side and connected to the superstructure and the tower-like structure, thereby connecting the superstructure and the tower-like structure erected within the frame of the superstructure. The goal is to implement these measures sequentially.

[0016] Claim 6 The features of the invention described herein are: a pile-driving step of driving multiple pile-like bodies into the seabed ground surrounding a tower-like structure to be constructed later; a superstructure installation step of installing a polygonal frame-shaped superstructure having beam sections to be erected between the pile-like bodies; and a tower structure erection step of driving the tower-like structure or the cylindrical foundation bodies constituting it into the seabed ground through the frame of the superstructure and erecting the tower-like structure or the cylindrical foundation bodies. Multiple seismic damping connectors are arranged in multiple sets in the circumferential direction, with spacing between them in the vertical direction. Applicable A seismic damping connector installation process is performed in which, among a plurality of seismic damping connectors arranged at intervals in the vertical direction, the upper seismic damping connectors are oriented horizontally and connected at both ends to the superstructure and the tower-like structure, and the lower seismic damping connectors are oriented so that both ends are lower on the superstructure side than on the tower-like structure side and connected to the superstructure and the tower-like structure, thereby connecting the superstructure and the tower-like structure erected within the frame of the superstructure. The goal is to implement these measures sequentially.

[0017] Claim 7The features of the invention described in Claim 5 or 6 In addition to the structure of

[0018] Claim 8 The features of the invention described in Claim 5 or 6 In addition to the structure of

[0019] Claim 9 The features of the invention described in Claim 7 In addition to the structure of

Effects of the Invention

[0020] The seismic isolation structure of the tower-like structure according to the present invention, by comprising the structure described in claim 1, It is possible to connect the tower-like structure and the pile-supported structure in a structurally stable manner, and makes the pile support structure connected via the seismic isolation connecting body bear the energy due to seismic motion, and can reduce the burden on the entire tower-like structure. Further, by reducing the burden on the entire tower-like structure, the sectional force acting on the tower-like structure during an earthquake can be reduced, and accordingly, the outer diameter and wall thickness of the foundation cylindrical body such as a monopile can be reduced.

[0021] Furthermore, in the present invention, Claim 2 by comprising the structure described in

[0022] the tower-like structure and the pile support structure can be easily and efficiently connected. Claims 3 to 4 Also, in the present invention,

[0023] In the present invention, Claim 5By providing the configuration described above, it is possible to connect the erected tower-like structure and the pile-supported structure to construct a seismic damping structure.

[0024] Furthermore, in the present invention, Claim 6 By having the configuration described above, it is possible to construct a seismic isolation structure by erecting a tower-like structure after constructing a section support structure, connecting the tower-like structure and the pile support structure.

[0025] Furthermore, in the present invention, Claim 7 By incorporating the configuration described above, the superstructure of the pile support structure can be installed efficiently, and the construction period can be shortened.

[0026] Furthermore, in the present invention, Claims 8 to 9 By having the configuration described above, the tower-like structure and the pile-supporting structure can be easily and efficiently connected. [Brief explanation of the drawing]

[0027] [Figure 1] This is a front view showing an embodiment of the seismic damping structure for a tower-like structure according to the present invention. [Figure 2] This is a partially enlarged plan view showing the seismic damping structure portion of the same structure. [Figure 3] This is a cross-sectional view taken along line AA in Figure 2. [Figure 4] This is a partially enlarged longitudinal cross-sectional view showing the state after the cylindrical foundation body has been cast during the tower structure erection process in the method for constructing a tower-like structure with a seismic damping structure according to the present invention. [Figure 5] This is a partially enlarged longitudinal cross-sectional view showing the state in which the connecting cylindrical body for the tower-like structure erection process described above is connected to the foundation cylindrical body. [Figure 6] This is a partially enlarged longitudinal cross-sectional view showing the state of the pile-like body driving process described above. [Figure 7] This is a partially enlarged longitudinal cross-sectional view showing the state of the superstructure installation process as described above. [Figure 8] This is a partially enlarged longitudinal cross-sectional view showing the state of the seismic damping connector connection process described above. [Figure 9]This figure shows another embodiment of the method for constructing a tower-like structure with a seismic damping structure according to the present invention, and is a partially enlarged longitudinal cross-sectional view showing the state of the pile-like body driving process. [Figure 10] This is a partially enlarged longitudinal cross-sectional view showing the state of the superstructure installation process as described above. [Figure 11] This is a partially enlarged longitudinal cross-sectional view showing the cylindrical foundation body of the tower-like structure erection process described above in contact with the seabed ground. [Figure 12] This is a partially enlarged longitudinal cross-sectional view showing the state in which the connecting cylindrical body for the tower-like structure erection process described above is connected to the foundation cylindrical body. [Figure 13] This is a partially enlarged longitudinal cross-sectional view showing the state of the seismic damping connector connection process described above. [Figure 14] This is a partially enlarged plan view showing another embodiment of the seismic damping structure for a tower-like structure according to the present invention. [Figure 15] This is a cross-sectional view taken along the line BB shown above. [Figure 16] This is a cross-sectional view taken along the line BB, showing yet another embodiment of the seismic damping structure for a tower-like structure according to the present invention. [Modes for carrying out the invention]

[0028] Next, an embodiment of the seismic damping structure for a tower-like structure according to the present invention will be described based on the example shown in Figures 1 to 3. In the figures, reference numeral 1 denotes the ground such as bedrock, and reference numeral 2 denotes the water surface. Furthermore, this embodiment will be described using a monopile-type offshore wind power generation facility 3 as an example of a tower-like structure.

[0029] As shown in Figure 1, the offshore wind power generation facility 3 comprises a cylindrical foundation body 4 (monopile foundation) erected on the seabed 1 while being penetrated into the seabed 1, a hollow cylindrical tower body 6 connected to the upper end of the cylindrical foundation body 4 via a connecting cylindrical body 5 (transition piece), and a wind turbine facility 7 (nacelle and rotor) supported at the upper end of the tower body 6. The cylindrical foundation body 4, the connecting cylindrical body 5, and the tower body 6 form a tower shape.

[0030] The foundation cylindrical body 4 is made of steel pipe or the like and comprises a cylindrical main body portion 4a with open upper and lower ends, and a frustoconical connecting portion 4b that tapers towards the top and is integrally formed at the upper end of the main body portion 4a, with the skirt portion 5a of the connecting cylindrical body 5 fitted to the outside of the connecting portion 4b.

[0031] Furthermore, the form of the cylindrical base body 4 is not limited to a cylindrical shape; for example, it may be a polygonal cylinder or the like.

[0032] As shown in Figures 1 and 3, the foundation cylindrical body 4 is driven into the water with its lower end penetrating the seabed ground 1 to a predetermined depth and its upper end protruding above the water surface 2 by a predetermined height, and the connecting cylindrical body 5 is connected to it above the water surface. The height to which the foundation cylindrical body 4 protrudes from the seabed ground 1 is not limited to the above embodiment; for example, the upper end of the foundation cylindrical body 4 may be submerged in water when it is connected to the connecting cylindrical body 5.

[0033] Furthermore, this tower-like structure, the offshore wind power generation facility 3 (hereinafter referred to as "tower-like structure 3"), is equipped with a seismic damping structure 8, which reduces the burden caused by external forces such as earthquakes.

[0034] This seismic damping structure 8 comprises a plurality of pile-like bodies 10, 10... erected in the seabed ground 1 surrounding the tower-like structure 3, and a polygonal frame-shaped superstructure 11 supported by the pile-like bodies 10, 10... The tower-like structure 3 is erected within the frame of the superstructure 11, and the superstructure 11 and the tower-like structure 3 are connected by a plurality of seismic damping connectors 12, 12... The structure is designed to dampen seismic forces by distributing the external forces caused by earthquakes and other motions acting on the tower-like structure 3 to the pile-supporting structure 13, which consists of the pile-like bodies 10, 10... and the superstructure 11.

[0035] The pile-like bodies 10, 10... are made of steel pipes or the like, with their lower ends driven into the seabed ground 1 to a predetermined depth, their upper ends protruding above the water surface 2 by a predetermined height, and their upper ends being at approximately the same height as the upper end of the connecting cylindrical body 5.

[0036] Furthermore, the penetration depth of the pile-like bodies 10, 10… into the seabed ground 1 shall be such that the pile-like bodies 10 can stand upright while protruding from the seabed ground 1 at a predetermined height, but this shall be determined considering the ground conditions, the shape and weight of the superstructure 11, the oceanographic conditions of the installation area, etc. For example, in this embodiment, the pile-like bodies 10, 10… are penetrated to approximately the same depth as the foundation cylindrical bodies 4, but the penetration depth of the pile-like bodies 10, 10… may be shallower than that of the foundation cylindrical bodies 4, or conversely, deeper.

[0037] The superstructure 11 is made up of pre-formed precast concrete members and is formed in a polygonal frame shape (rectangular frame shape in this embodiment) in plan view, having beam sections 11a that are erected between adjacent pile-like bodies 10, 10. In this embodiment, the case in which the superstructure 11 is made up of a single precast concrete member has been described, but the superstructure 11 may also be made up of multiple precast concrete members.

[0038] In this embodiment, the case in which the superstructure 11 is rectangular in shape when viewed from above has been described, but the form of the superstructure 11 is not limited to this, and it may also be triangular in shape or polygonal in shape with pentagons or more when viewed from above.

[0039] The precast concrete members constituting the superstructure 11 have pile connection holes 14 formed in the corners that penetrate in the thickness direction, and the pile heads of the pile-like bodies 10, 10... are inserted into these pile connection holes 14 and joined together.

[0040] Furthermore, since the superstructure 11 is a polygonal frame in plan view with a triangle or more sides, pile-like bodies 10, 10... are joined at the corners, and the beam section 11a is erected between adjacent pile-like bodies 10, 10..., there are at least three or more pile-like bodies 10, 10....

[0041] Furthermore, the pile-supporting structure 13, on which the superstructure 11 is supported by each of these pile-like bodies 10, 10..., is designed to have a different natural frequency than the tower-like structure 3.

[0042] The seismic damping connecting bodies 12, 12... are composed of dampers such as oil dampers and air dampers, and spring materials that absorb shock through expansion and contraction, and both ends are connected to the outer surface of the tower-like structure 3 (in this embodiment, the connecting cylindrical body 5) at the inner corner portion of the frame of the superstructure 11 and at the position opposite the corner portion.

[0043] In this embodiment, as described below, the installation position of the seismic damping connector 12 is set to the outer surface of the tower-like structure 3 (connecting cylindrical body 5 in this embodiment) at positions where both ends are facing the inner corners and corners of the superstructure 11, respectively. However, the installation position of the seismic damping connector 12 is not limited to this, and can be set to any position suitable for seismic damping. For example, it may be set to connect the side surface of the beam section 11a of the superstructure 11 to the outer surface of the tower-like structure 3 (connecting cylindrical body 5 in this embodiment).

[0044] Connecting members 15, 15… are fixed to the outer surface of the tower-like structure 3 (connecting cylindrical body 5 in this embodiment) located in the inner corner portion of the superstructure 11 and opposite the corner portion, and the ends of the seismic damping connecting members 12, 12… are detachably connected to the connecting members 15, 15….

[0045] The configuration of the connector 15 is not particularly limited, but it is preferable that it comprises, for example, a pair of bearing plates facing each other horizontally and a pivot shaft member that penetrates between the two bearing plates, and that the ends of the vibration-damping connector are pivotally supported on the two bearing plates via the pivot shaft member so that they can rotate vertically.

[0046] Furthermore, multiple sets of seismic damping connectors 12, 12… (in this embodiment, one pair vertically) are provided in the circumferential direction, with intervals between them in the vertical direction, thereby stably connecting the tower-like structure 3 and the superstructure 11.

[0047] Furthermore, of the multiple seismic damping connectors 12, 12… (in this embodiment, a pair of upper and lower connectors) arranged at intervals in the vertical direction, the upper seismic damping connectors 12, 12… are connected at both ends to the inner corners of the frame of the superstructure 11 and to the outer surface of the tower-like structure 3 at positions facing the corners, respectively, when oriented horizontally. The lower seismic damping connectors 12, 12… are connected in an inclined arrangement, with the connectors 15, 15… on the superstructure 11 side being lower than the connectors 15, 15… on the tower-like structure 3 side, thus forming a truss structure.

[0048] Next, the construction method of the seismic-damping tower structure 3 according to the present invention will be described with reference to Figures 4 to 8. Components similar to those in the above-described embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0049] First, the cylindrical foundation body 4 is erected by penetrating it into the ground 1 based on existing construction methods.

[0050] Specifically, although not shown in the diagram, first, the cylindrical foundation structures 4, such as monopiles, manufactured at onshore factories or manufacturing yards, are transported to the base port, where they are loaded onto the SEP vessel (hereinafter referred to as a SEP vessel) using its crane.

[0051] Next, the cylindrical foundation body 4 is loaded onto a SEP vessel and transported by sea to the installation area. At the installation area, the legs of the SEP vessel are lowered and allowed to settle on the seabed, and the main body of the SEP vessel, supported by the legs, is raised above the water to stabilize the main body of the SEP vessel against waves and other elements.

[0052] Next, the cylindrical foundation body 4 loaded on the SEP vessel is lifted upright using the SEP vessel's crane, secured with pile grippers, etc., and then lowered to the seabed 1 and settled on the bottom.

[0053] Then, the top of the cylindrical foundation body 4, which has been placed on the seabed ground 1, is driven into the ground with a hammer or the like, and the cylindrical foundation body 4 is installed by penetrating it into the seabed ground 1 as shown in Figure 4 (cylindrical foundation body erection process).

[0054] Next, as shown in Figure 5, the skirt portion 5a of the connecting cylindrical body 5 is fitted into the connecting portion 4b of the foundation cylindrical body 4, and after adjusting the circumferential position, grout is injected from below into the gap between the outer surface of the foundation cylindrical body 4 and the inner surface of the connecting cylindrical body 5 to fix them in place.

[0055] At that time, connectors 15, 15... are fixed in advance to the outer surface of the connecting cylindrical body 5 at predetermined positions.

[0056] Next, as shown in Figure 6, multiple pile-like bodies 10, 10… are driven into the seabed ground 1 surrounding the cylindrical foundation body 4 that will form the base of the tower-like structure 3 (pile-like body driving process).

[0057] Specifically, the pile-like bodies 10, 10… loaded on the SEP vessel or barge are lifted up using the SEP vessel's crane and then lowered to the seabed 1. From this position, the tops of the pile-like bodies 10, 10… that have settled on the seabed 1 are driven into the ground using a hammer or similar tool.

[0058] Then, the above procedure is carried out for each pile-like body 10, 10… and, as shown in Figure 6, each pile-like body 10, 10… is driven into the seabed ground 1 at a predetermined horizontal distance from the foundation cylindrical body 4. It is desirable that the distance between each pile-like body 10, 10… and the foundation cylindrical body 4 be approximately equal.

[0059] Next, the precast concrete members constituting the superstructure 11 are lifted by a crane or the like and moved above the foundation cylindrical body 4 and the pile-like bodies 10, 10... The position of each pile connection hole 14 of the superstructure 11 is adjusted to the position of each pile-like body 10, 10... At that position, the precast concrete members are lowered and the pile connection holes 14 are fitted into the pile heads, temporarily supporting the precast concrete members for the superstructure 11 on each pile-like body 10, 10...

[0060] Then, as shown in Figure 7, a filler material 16 made of concrete or mortar is poured into the pile connection holes 14 and the pile heads of the pile-like bodies 10, 10… to fill the gap between the inner surface of the pile connection holes 14 and the outer surface of the pile heads, and precast concrete members for the superstructure 11 are joined to the pile heads of each pile-like body 10, 10… to construct the pile support structure 13 (superstructure installation process).

[0061] Furthermore, connectors 15, 15… are fixed in predetermined positions at the inner corners of the precast concrete members for the superstructure 11.

[0062] Then, as shown in Figure 8, both ends of the seismic damping connectors 12, 12… are connected to connectors 15, 15… fixed to the outer surface of the tower-like structure 3 (connecting cylindrical body 5 in this embodiment) at the corners within the frame of the superstructure 11 and at positions facing the corners, respectively, thereby connecting the tower-like structure 3 and the pile support structure 13 via each seismic damping connector 12, 12….

[0063] Next, once the construction of the seismic isolation structure 8 is complete, the tower body 6 with the wind turbine equipment 7 (nacelle and rotor) fixed to its upper end is transported to the construction area. The tower body 6 with the wind turbine equipment 7 (nacelle and rotor) fixed to its upper end is then lifted by an SEP vessel or crane vessel, and the lower end of the tower body 6 is connected to the foundation cylindrical body 4 via the connecting cylindrical body 5 to construct the offshore wind power generation facility 3.

[0064] The seismic damping structure of the tower-like structure 3, configured in this way, connects the tower-like structure 3, which has a different natural frequency from the pile-supported structure 13, which has a concrete superstructure 11 supported by pile-like bodies 10, 10... via seismic damping connectors 12, 12.... This distributes external forces such as seismic motion applied to the tower-like structure 3 to the tower-like structure 3 and the pile-supported structure 13, controlling their vibrations (connected seismic damping) and reducing the overall load on the tower-like structure 3.

[0065] Furthermore, by using dampers, rubber, springs, or other elastic materials in the seismic damping connectors 12, 12..., the seismic damping connectors 12, 12... can absorb external forces caused by seismic motion, etc., and exhibit a high vibration damping effect.

[0066] Furthermore, by reducing the load on the tower-like structure 3, the sectional forces acting on the tower-like structure 3 during an earthquake can be reduced, which in turn allows for a reduction in the outer diameter and wall thickness of the tower-like structure 3.

[0067] In the above embodiment, the case in which the cylindrical foundation body 4 constituting the tower-like structure 3 is erected first was described. However, as shown in Figures 9 to 13, the pile support structure 13 may be constructed first, and then the cylindrical foundation body 4 may be erected. Components similar to those in the above embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0068] Specifically, as shown in Figures 9 and 10, after carrying out the pile driving process and the superstructure installation process, as shown in Figure 11, the cylindrical foundation body 4, lifted by a crane, is lowered to the bottom ground 1 through the frame of the superstructure 11, and from that state, the cylindrical foundation body 4 is driven in to a predetermined depth using a hammer or the like, thereby erecting the cylindrical foundation body 4 (tower structure erection process).

[0069] Next, as shown in Figure 12, the skirt portion 5a of the connecting cylindrical body 5 is fitted into the connecting portion 4b of the foundation cylindrical body 4, the circumferential position is adjusted, and the joint is fixed in place by injecting grout from below into the gap between the outer surface of the foundation cylindrical body 4 and the inner surface of the connecting cylindrical body 5.

[0070] At that time, connectors 15, 15... are fixed in advance to the outer surface of the connecting cylindrical body 5 at predetermined positions.

[0071] Then, as shown in Figure 13, the superstructure 11 and the tower-like structure 3 erected within the frame of the superstructure 11 are connected by a plurality of seismic damping connectors 12, 12..., thereby connecting the tower-like structure 3 and the pile-supported structure 13 via each seismic damping connector 12, 12....

[0072] Once the construction of the seismic isolation structure 8 is complete, the tower body 6, with the wind turbine equipment 7 (nacelle and rotor) fixed to its upper end, is transported to the construction area. The tower body 6, with the wind turbine equipment 7 (nacelle and rotor) fixed to its upper end, is then lifted by a crane ship or the like. The lower end of the tower body 6 is then connected to the foundation cylindrical body 4 via the connecting cylindrical body 5, thereby constructing the offshore wind power generation facility 3.

[0073] Furthermore, the seismic damping structure 8 of the tower-like structure 3 according to the present invention may also include a wave-breaking wall 20 that is supported across the outer surface between adjacent pile-like bodies 10, 10..., as shown in Figures 14 to 16.

[0074] The breakwater wall 20 comprises concrete wall fixing members 21, 21 fixed to the outer surface of the pile-like bodies 10, 10..., and wall bodies 22 whose ends are supported by the wall fixing members 21, 21 fixed to adjacent pile-like bodies 10, 10, forming a rectangular frame shape in plan view with the wall bodies 22 arranged on all four sides.

[0075] Furthermore, it is not necessary to provide the wall body 22 between all the pile-like structures 10, 10... (on all four sides in this embodiment) of the breakwater wall 20. For example, the wall body 22 may be provided only on one side facing the sea, or one side may be left blank to serve as an inspection channel for the tower-like structure 3.

[0076] Furthermore, as shown in Figure 16, the breakwater wall 20 may be fixed at predetermined intervals from the superstructure 11 of the pile-like bodies 10, 10... and the seabed ground 1.

[0077] Furthermore, the wall fixing member 21 may be made of steel instead of concrete, and the upper part of the breakwater wall 20 may be supported by a precast concrete member for the superstructure 11.

[0078] In this case, the wall fixing members 21, 21 and the outer surface of the tower-like structure 3 (foundation cylindrical body 4) are rigidly connected by connecting members 23, 23 arranged at intervals in the circumferential direction, and the tower-like structure 3 and the pile support structure 13 are firmly connected, thereby obtaining a more stable seismic damping effect. [Explanation of symbols]

[0079] 1 Underwater ground 2 water surface 3. Offshore wind power generation equipment (tower-like structure) 4. Cylindrical base 5 Connection tube 6. Main tower section 7 Windmill equipment 8. Vibration damping structure 10 Pile-shaped body 11 Superstructure 12. Seismic damping connector 13 Pile support structures 14 Pile joint hole 15 Connectors 16 Filling material 20 Wavebreak wall 21 Wall fixing member 22 Wall Unit 23 Connecting member

Claims

1. In a seismic damping structure for a tower-like structure erected on the seabed ground while penetrating the seabed ground, The tower-like structure comprises a plurality of pile-like bodies erected in the seabed ground while penetrating the seabed ground surrounding the tower-like structure, and a superstructure that is polygonal in shape in plan view, having beam sections that are erected between the pile-like bodies. The tower-like structure is erected within the frame of the superstructure, Multiple seismic damping connectors, spaced apart in the vertical direction, are provided in multiple sets in the circumferential direction. Of the multiple seismic damping connectors arranged at intervals in the vertical direction, the upper seismic damping connectors are connected to the superstructure and the tower-like structure at both ends in the horizontal direction, and the lower seismic damping connectors are connected to the superstructure and the tower-like structure at both ends in an inclined arrangement where the superstructure side is lower than the tower-like structure side. A seismic damping structure for a tower-like structure, characterized in that the superstructure and the tower-like structure are connected by a plurality of seismic damping connectors.

2. The seismic damping structure for a tower structure according to claim 1, wherein a connector is fixed to the tower structure and the superstructure, to which the end of the seismic damping connector is detachably connected.

3. The seismic damping structure for a tower-like structure according to claim 1, wherein the seismic damping connecting body is composed of dampers.

4. The seismic damping structure for a tower-like structure according to claim 2, wherein the seismic damping connecting body is composed of dampers.

5. A tower structure erection process involves erecting a tower-like structure or a part of said tower-like structure in a state where it is embedded in the seabed ground, A pile driving step involves driving multiple pile-like bodies into the seabed ground surrounding the tower-like structure, A superstructure installation step involves installing a polygonal frame-shaped superstructure having beam sections that are erected between the aforementioned pile-like bodies, A seismic damping connector installation process involves arranging multiple sets of seismic damping connectors spaced apart vertically in a circumferential direction, connecting the upper seismic damping connectors horizontally with both ends to the superstructure and the tower-like structure, and connecting the lower seismic damping connectors to the superstructure and the tower-like structure with both ends to the superstructure and the tower-like structure in an inclined position where the superstructure side is lower than the tower-like structure side, thereby connecting the superstructure and the tower-like structure erected within the frame of the superstructure. A method for constructing a tower-like structure with a seismic damping structure, characterized by sequentially implementing the following.

6. The pile driving process involves driving multiple pile-like bodies into the seabed ground surrounding the tower-like structure to be constructed later, A superstructure installation step involves installing a polygonal frame-shaped superstructure having beam sections that are erected between the aforementioned pile-like bodies, A tower-like structure erection process involves penetrating the tower-like structure or the cylindrical foundation body constituting it into the seabed ground through the frame of the superstructure, and erecting the tower-like structure or the cylindrical foundation body. A seismic damping connector installation process involves arranging multiple sets of seismic damping connectors spaced apart vertically in a circumferential direction, connecting the upper seismic damping connectors horizontally with both ends to the superstructure and the tower-like structure, and connecting the lower seismic damping connectors to the superstructure and the tower-like structure with both ends to the superstructure and the tower-like structure in an inclined position where the superstructure side is lower than the tower-like structure side, thereby connecting the superstructure and the tower-like structure erected within the frame of the superstructure. A method for constructing a tower-like structure with a seismic damping structure, characterized by sequentially implementing the following.

7. The method for constructing a tower-like structure with a seismic damping structure according to claim 5 or 6, wherein the superstructure installation step involves joining one or more pre-formed precast concrete members to the pile heads of the pile-like bodies to install the superstructure.

8. A method for constructing a tower structure with a seismic damping structure according to claim 5 or 6, wherein a connector is fixed in advance at a predetermined position on the tower structure and the superstructure, to which the end of the seismic damping connector is detachably connected.

9. A method for constructing a tower structure with a seismic damping structure according to claim 7, wherein a connector is fixed in advance at a predetermined position on the tower structure and the superstructure, to which the end of the seismic damping connector is detachably connected.

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