Anchor device, anchor device installation system, and anchor device installation method

Abstract

This involves driving anchors deeper into the ground layer with relatively little penetration force. [Solution] The anchor device 30 comprises a first anchor 31, a second anchor 32 positioned above the first anchor 31, and a connecting member 34 that connects the first anchor 31 and the second anchor 32.

Description

Technical Field

[0001] The present invention relates to an anchor device, an anchor device installation system, and an anchor device installation method.

Background Art

[0002] Conventionally, a wind power generation device used in a floating state on the ocean is known. Such a wind power generation device is also called a floating offshore wind power generation device. The floating offshore wind power generation device includes a floating structure and a mooring system. The floating structure includes blades that rotate by receiving wind, a nacelle that houses a generator, a tower that supports the nacelle, and a support portion for supporting the tower. The mooring system is a system for mooring the floating structure to the ground. The mooring system includes an anchor disposed in the ground and a mooring line that connects the floating structure and the anchor. The mooring line is, for example, a wire, and connects the support portion of the floating structure and the anchor. Patent Document 1 discloses an example of the mooring system.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The holding force of the anchor is determined by the size of the anchor and the penetration depth into the ground layer. The larger the size of the anchor, the greater the holding force of the anchor, and the greater the penetration depth into the ground layer, the greater the holding force of the anchor. However, in order to penetrate a large anchor into the ground layer, a large penetration force is required, and in order to penetrate the anchor to a deeper position in the ground layer, a large penetration force is required. In order to exert a large penetration force, it is necessary to use a larger penetration device, and there is a problem that the cost for installing the anchor increases.

[0005] This invention has been made with these points in mind, and aims to provide an anchor device, an anchor device installation system, and an anchor device installation method that can penetrate anchors to deeper positions within the ground layer with relatively little penetration force. [Means for solving the problem]

[0006] The anchor device according to the present invention is [1] First anchor and, A second anchor positioned above the first anchor, An anchoring device comprising a connecting member that connects the first anchor and the second anchor.

[0007] The anchor device according to the present invention is [2] The anchor device according to [1], further comprising a traction device for pulling the connecting member.

[0008] The anchor device according to the present invention is [3] The anchor device according to [1] or [2], further comprising a pulley attached to the first anchor or the second anchor and around which a part of the connecting member is wrapped.

[0009] The anchor device according to the present invention is [4] The first anchor and / or the second anchor are A shaft member that extends along the central axis and to which the connecting member is attached, The system comprises a first plate member and a second plate member configured to be rotatable relative to each other around the central axis, The first plate member has a first rear end that is furthest from the central axis in a direction that extends along the first plate member and is perpendicular to the central axis, The second plate member has a second rear end that is furthest from the central axis in a direction that extends along the second plate member and is perpendicular to the central axis, The anchor device is configured to change from a folded state in which the first rear end and the second rear end are close together to an unfolded state in which the first rear end and the second rear end are separated, as described in any one of [1] to [3].

[0010] The anchor device installation system according to the present invention is [5] First anchor and, The second anchor and, A connecting member that connects the first anchor and the second anchor, A penetration device for penetrating the first anchor and / or the second anchor into the ground layer, An anchor device installation system comprising a towing device for pulling the aforementioned connecting member.

[0011] The anchor device installation system according to the present invention is [6] The anchor device installation system according to [5], further comprising a pulley attached to the first anchor or the second anchor and around which a part of the connecting member is wrapped.

[0012] The anchor device installation system according to the present invention is [7] The first anchor and / or the second anchor are A shaft member that extends along the central axis and to which the connecting member is attached, The system comprises a first plate member and a second plate member configured to be rotatable relative to each other around the central axis, The first plate member has a first rear end that is furthest from the central axis in a direction that extends along the first plate member and is perpendicular to the central axis, The second plate member has a second rear end that is furthest from the central axis in a direction that extends along the second plate member and is perpendicular to the central axis, The anchor device installation system according to [5] or [6] is configured to change from a folded state in which the first rear end and the second rear end are close together to an unfolded state in which the first rear end and the second rear end are separated.

[0013] The method for installing an anchor device according to the present invention is as follows: [8] a first anchor, a second anchor disposed above the first anchor, and a connecting member connecting the first anchor and the second anchor, and the method for installing an anchor device includes: a first installation step of installing the first anchor in a ground layer, and a second installation step of installing the second anchor in the ground layer. In the second installation step, the second anchor is brought closer to the first anchor by pulling the connecting member using a traction device. This is the method for installing an anchor device.

Advantages of the Invention

[0014] According to the present invention, it is possible to provide an anchor device, an anchor device installation system, and a method for installing an anchor device that can penetrate an anchor to a deeper position in a ground layer with a relatively small penetration force.

Brief Description of the Drawings

[0015] [Figure 1] FIG. 1 is a diagram for explaining an embodiment of the present invention, showing an example of a wind power generation device and an anchor device. [Figure 2] FIG. 2 is a diagram showing an example of an anchor device. [Figure 3] FIG. 3 is a diagram showing an example of a method for installing an anchor device. [Figure 4] FIG. 4 is a diagram showing an example of a method for installing an anchor device. [Figure 5] FIG. 5 is a diagram showing an example of a method for installing an anchor device. [Figure 6] FIG. 6 is a diagram showing an example of a method for installing an anchor device. [Figure 7] FIG. 7 is a diagram for explaining the balance state of forces acting on the anchor device. [Figure 8] FIG. 8 is a diagram showing an example of a method for installing an anchor device. [Figure 9] Figure 9 shows a modified example of an anchor, and is a side view showing the anchor in a folded state. [Figure 10] Figure 10 is a side view showing the anchor in Figure 9 in the process of being deployed. [Figure 11] Figure 11 is a side view showing the anchor in Figure 9 in its deployed state. [Figure 12] Figure 12 is a plan view showing the anchor in its deployed state. [Figure 13] Figure 13 shows an example of how to install an anchor device in a modified example. [Figure 14] Figure 14 shows an example of how to install an anchor device in a modified example. [Figure 15] Figure 15 shows an example of how to install the anchor device in a modified example. [Figure 16] Figure 16 shows an example of how to install the anchor device in a modified example. [Figure 17] Figure 17 shows an example of how to install an anchor device in a modified example. [Figure 18] Figure 18 shows an example of how to install an anchor device in a modified example. [Figure 19] Figure 19 shows an example of how to install an anchor device in a modified example. [Figure 20] Figure 20 shows an example of how to install the anchor device in a modified example. [Figure 21] Figure 21 shows another variation of the anchor device. [Figure 22] Figure 22 shows yet another variation of the anchor device. [Figure 23] Figure 23 shows yet another variation of the anchor device. [Figure 24] Figure 24 shows yet another variation of the anchor device. [Modes for carrying out the invention]

[0016] One embodiment of the present invention will be described below with reference to the drawings. Note that, for the sake of illustration and ease of understanding, the scale and aspect ratios of the drawings attached to this specification have been appropriately altered and exaggerated from those of the actual objects.

[0017] Figure 1 is a diagram illustrating one embodiment of the present invention, showing an example of a wind power generation device 10 and an anchor device 30. The wind power generation device 10 in this embodiment is a so-called floating offshore wind power generation device, which generates electricity while floating on a water layer W. The water layer W is, for example, a layer of seawater or freshwater. That is, the wind power generation device 10 in this embodiment is arranged to float on the surface of the sea or lake, etc.

[0018] The wind turbine 10 includes blades 11 that rotate in response to wind, a nacelle 12 housing a generator, a tower 13 supporting the nacelle 12, and a support section 14 supporting the tower 13. The blades 11 are connected to the generator housed in the nacelle 12 via a mechanism such as gears. In the wind turbine 10, the generator generates electricity as the blades 11 rotate due to the wind. The generated electricity is sent to a substation located on land or elsewhere via cables (not shown).

[0019] The anchor device 30 is connected to the wind turbine 10 by a tension member 24. In this embodiment, the anchor device 30 is used to hold the wind turbine 10 in a predetermined position. The anchor device 30 may also be used to hold other devices or structures other than the wind turbine 10 in a predetermined position. That is, the anchor device 30 may be used to hold other devices or structures floating on or in the water layer W in a predetermined position. Furthermore, the anchor device 30 may be used to maintain the position and orientation of devices or structures located on land or floating in the atmosphere. For example, the anchor device 30 may be used to maintain the orientation of tower-shaped or columnar structures such as power transmission towers and chimneys located on land.

[0020] The tension member 24 is used as a so-called mooring line that applies tensile force to the anchor device 30 located within the ground layer G. The tension member 24 may also be attached to the second anchor 32 of the anchor device 30, which will be described later. The tension member 24 can be any material, such as a rope, chain, wire, cable, belt, rod, or plate-shaped member, without any particular limitations. The tension member 24 may be a flexible member or a rigid body.

[0021] Figure 2 shows an example of an anchoring device 30. The anchoring device 30 includes a first anchor 31, a second anchor 32, and a connecting member 34. The second anchor 32 is a member that performs the anchoring function in the anchoring device 30. The second anchor 32 is positioned above the first anchor 31. The first anchor 31 has the function of assisting the penetration of the second anchor 32 into the ground layer G.

[0022] The resistance force required to penetrate the first anchor 31 into the ground layer G is smaller than the resistance force required to penetrate the second anchor 32 into the ground layer G. That is, when the first anchor 31 and the second anchor 32 are penetrated to the same depth in the ground layer G, the penetration force required to penetrate the first anchor 31 is smaller than the penetration force required to penetrate the second anchor 32. Also, when the same penetration force is applied to the first anchor 31 and the second anchor 32, the first anchor 31 penetrates deeper into the ground layer G than the second anchor 32. Such an anchor device 30 can be realized, for example, by making the maximum cross-sectional area of ​​the first anchor 31 when penetrating the ground layer G smaller than the maximum cross-sectional area of ​​the second anchor 32. The maximum cross-sectional area of ​​anchors 31 and 32 refers to the largest area among the cross-sectional areas of anchors 31 and 32 perpendicular to the penetration direction. Alternatively, this can be realized by the shapes of the first anchor 31 and the second anchor 32. For example, this can be achieved by providing an inclined surface on the outer surface of the first anchor 31 such that the cross-sectional area decreases towards the tip (lower end). The specific shapes of the first anchor 31 and the second anchor 32 are not particularly limited.

[0023] The connecting member 34 is a member that connects the first anchor 31 and the second anchor 32. The connecting member 34 can be any member, such as a rope, wire, cable, belt, rod, or plate, without any particular limitations. The connecting member 34 may be a flexible member or a rigid member. The end of the connecting member 34 may be fixed to the anchors 31 and 32, or it may be connected to the anchors 31 and 32 via another member (for example, a pulley 38 described later).

[0024] The anchoring device 30 may include a towing device 36. The towing device 36 is a device for towing the connecting member 34. If the connecting member 34 is a rope, wire, cable, belt, or the like, the towing device 36 may be a winding device for winding up the connecting member 34. The winding device is, for example, a winch. In the example shown in Figure 2, the towing device 36 is attached to the second anchor 32. However, it is not limited to this, and the towing device 36 may be located in a place where the connecting member 34 can be towed. For example, the towing device 36 may be attached to the first anchor 31. Also, the towing device 36 does not have to be included in the anchoring device 30. In this case, the towing device 36 may be located in the penetration device 22 or the workboat 16.

[0025] Next, with reference to Figures 3 to 8, the method for installing the anchor device 30 and the anchor device installation system 20 used to install the anchor device 30 will be described. Figures 3 to 6 and Figure 8 are diagrams illustrating an example of the method for installing the anchor device 30. Figure 7 is a diagram illustrating the equilibrium state of the forces acting on the anchor device 30 when installing the second anchor 32.

[0026] First, the anchor device installation system 20 is prepared (preparation step). The anchor device installation system 20 of this embodiment includes a first anchor 31, a second anchor 32, a connecting member 34, a traction device 36, and a penetration device 22. The penetration device 22 is a device for penetrating the first anchor 31 and the second anchor 32 into the ground layer G. The penetration device 22 is not particularly limited, but may be a vibro-hammer, a striking hammer, a water jet device, etc. Furthermore, the first anchor 31 and the second anchor 32 may be penetrated using the same penetration device 22, or the first anchor 31 and the second anchor 32 may be penetrated using different penetration devices 22.

[0027] As shown in Figure 3, the first anchor 31 is positioned at a predetermined location above the site where it is to be buried (first anchor 31 positioning step). At this time, the first anchor 31 and the penetration device 22 are suspended and held from a workboat 16 floating on the water layer W.

[0028] As shown in Figure 4, the first anchor 31 is installed in the ground layer G (first installation step). Specifically, the first anchor 31 is driven into the ground layer G using the penetration device 22. At this time, the resistance force when driving the first anchor 31 into the ground layer G is smaller than the resistance force when driving the second anchor 32 into the ground layer G, so the first anchor 31 is driven to a relatively deep position in the ground layer G.

[0029] As shown in Figure 5, the second anchor 32 is positioned in a predetermined location (second anchor 32 positioning step). At this time, the second anchor 32 and the penetration device 22 are suspended and held from the workboat 16 floating on the water layer W. In this embodiment, the towing device 36 is attached to the second anchor 32. The second anchor 32 is connected to the first anchor 31 by a connecting member 34.

[0030] As shown in Figure 6, the second anchor 32 is installed in the ground layer G (second installation step). Specifically, the second anchor 32 is driven into the ground layer G using the penetration device 22. At this time, the second anchor 32 is brought closer to the first anchor 31 by pulling the connecting member 34 using the traction device 36. If the traction device 36 is a winding device such as a winch, the connecting member 34 is pulled by winding it up with the winding device.

[0031] Figure 7 is a diagram illustrating the equilibrium state of forces acting on the anchor device 30 during the second installation process. When the penetration device 22 presses against the second anchor 32, a penetration force F acting on the second anchor 32 toward the first anchor 31 (downward). A resistance force Q2 from the ground layer G acts on the second anchor 32, which is located within the ground layer G. Note that the penetration device 22 has a predetermined maximum penetration force, and there is an upper limit to the value of the penetration force F.

[0032] If the anchor device installation system 20 does not have a first anchor 31, the second anchor 32 will continue to penetrate the ground layer G if the absolute value of the penetration force F is greater than the absolute value of the resistance force Q2 (|F|>|Q2|). In general, the greater the depth of the anchor, the greater the resistance force the anchor receives from the ground layer G. That is, as the depth of the second anchor 32 increases, the resistance force Q2 acting on the second anchor 32 also increases. Then, when the absolute value of the resistance force Q2 and the absolute value of the penetration force F become equal (|F|=|Q2|), the second anchor 32 stops and will not penetrate any further.

[0033] The anchor device installation system 20 of this embodiment includes a first anchor 31, a connecting member 34, and a traction device 36. The first anchor 31 is already placed in the ground layer G and exerts a holding force. Therefore, by pulling the connecting member 34 using the traction device 36, a resistance force R1 is generated on the first anchor 31, and a tension T acts on the connecting member 34. This tension T becomes a force that pulls the second anchor 32 toward the first anchor 31. Therefore, in the example shown in Figure 7, both the penetration force F from the penetration device 22 and the tension T received from the connecting member 34 act on the second anchor 32 in the direction toward the first anchor 31 (downward). Therefore, the force (resultant force) that the second anchor 32 receives in the direction toward the first anchor 31 (downward) becomes large. In this case, the second anchor 32 continues to penetrate the ground layer G when the sum of the absolute values ​​of the penetration force F and the tension T is greater than the absolute value of the resistance force Q2 (|F|+|T|>|Q2|). Then, when the absolute value of the resistance force Q2 becomes equal to the sum of the absolute values ​​of the penetration force F and the tension T (|F|+|T|=|Q2|), the second anchor 32 stops and does not penetrate any further.

[0034] As a result, when using a penetration device 22 with the same penetration force F, this embodiment allows the second anchor 32 to penetrate to a greater depth within the ground layer G compared to when the anchor device installation system 20 does not have the first anchor 31. Furthermore, when penetrating the second anchor 32 to a predetermined depth within the ground layer G, this embodiment allows the use of a penetration device 22 with a smaller penetration force F compared to when the anchor device installation system 20 does not have the first anchor 31.

[0035] In the second installation step, the distance between the first anchor 31 and the second anchor 32 decreases. The first anchor 31 and the second anchor 32 may come into contact with each other. If the first anchor 31 and the second anchor 32 come into contact with each other, the first anchor 31 and the second anchor 32 may be substantially integrated and function as a single anchor.

[0036] After the second installation process, as shown in Figure 8, the anchor device 30 is installed in the ground layer G by pulling up the penetration device 22. The end of the tension member 24 opposite to the anchor device 30 is connected directly or via other members to a device such as the wind turbine 10 or other structures (see Figure 1).

[0037] In the anchor device 30 after it has been installed in the ground layer G, both the first anchor 31 and the second anchor 32 may have a holding force. That is, both the first anchor 31 and the second anchor 32 may function as anchors. When the second anchor 32 is pulled upward, tension acts on the connecting member 34 and the first anchor 31 is also pulled, in which case both the first anchor 31 and the second anchor 32 function as anchors. On the other hand, in the anchor device 30 after it has been installed in the ground layer G, only the second anchor 32 may have a holding force. That is, only the second anchor 32 may function as an anchor. For example, when the connecting member 34 is relaxed and the second anchor 32 is pulled upward, tension does not act on the connecting member 34 and the first anchor 31 is not pulled, only the second anchor 32 functions as an anchor.

[0038] The anchor device 30 of this embodiment includes a first anchor 31, a second anchor 32 positioned above the first anchor 31, and a connecting member 34 that connects the first anchor 31 and the second anchor 32.

[0039] The anchor device installation system 20 of this embodiment includes a first anchor 31, a second anchor 32, a connecting member 34 that connects the first anchor 31 and the second anchor 32, a penetration device 22 that penetrates the first anchor 31 and / or the second anchor 32 into the ground layer G, and a traction device 36 that pulls the connecting member 34.

[0040] The method for installing the anchor device 30 of this embodiment is a method for installing an anchor device 30 comprising a first anchor 31, a second anchor 32 positioned above the first anchor 31, and a connecting member 34 that connects the first anchor 31 and the second anchor 32, comprising a first installation step of installing the first anchor 31 in the ground layer G, and a second installation step of installing the second anchor 32 in the ground layer G, wherein in the second installation step, the second anchor 32 is brought closer to the first anchor 31 by pulling the connecting member 34 using a traction device 36.

[0041] With this anchor device 30, anchor device installation system 20, and method for installing the anchor device 30, when installing the second anchor 32, in addition to the penetration force F from the penetration device 22, a tension T generated by pulling the connecting member 34 using the traction device 36 can be applied in the direction toward the first anchor 31 (downward). Therefore, the force (resultant force) that the second anchor 32 receives in the direction toward the first anchor 31 (downward) becomes larger. As a result, when using a penetration device 22 with the same penetration force F, in this embodiment it is possible to penetrate the second anchor 32 to a greater depth in the ground layer G compared to when the anchor device installation system 20 does not have the first anchor 31. Furthermore, when penetrating the second anchor 32 to a predetermined depth in the ground layer G, in this embodiment it is possible to use a penetration device 22 with a smaller penetration force F compared to when the anchor device installation system 20 does not have the first anchor 31.

[0042] The anchor device 30 of this embodiment further includes a traction device 36 for towing the connecting member 34.

[0043] With such an anchor device 30, since the anchor device 30 includes a traction device 36, the loss of traction force of the traction device 36 can be reduced compared to when the traction device 36 is installed at a separate location. Therefore, the efficiency of the traction force when the traction device 36 pulls the connecting member 34 can be improved.

[0044] Various modifications can be made to the embodiments described above. Hereinafter, modifications of the embodiments described above will be explained with reference to the drawings as appropriate. In the following description and the drawings used therein, parts that can be configured similarly to the embodiments described above will be given the same reference numerals as those used for the corresponding parts in the embodiments described above, and redundant explanations will be omitted.

[0045] The first anchor 31 and / or the second anchor 32 may be deployable anchors. A deployable anchor will be described with reference to Figures 9 to 12. Figure 9 is a side view showing a modified example of the anchor device 30, with the anchors 31 and 32 in a folded state. Figure 10 is a side view showing the anchors 31 and 32 of this modified example in an unfolded state. Figure 11 is a side view showing the anchors 31 and 32 of this modified example in an unfolded state. Figure 12 is a plan view showing the anchors 31 and 32 in an unfolded state. Note that the tension member 24 is not shown in Figures 9 and 12. In this specification, the first anchor 31 and the second anchor 32 are collectively referred to as anchors 31 and 32.

[0046] In this modified example, anchors 31 and 32 include a shaft member 42, a first plate member 50, and a second plate member 60. The first plate member 50 and the second plate member 60 have a generally plate-like shape. The shaft member 42 has a cylindrical shape and extends along a central axis A. The central axis A is the axis of rotation for the relative rotation of the first plate member 50 and the second plate member 60. The central axis A extends along the plate surface of the first plate member 50 and the plate surface of the second plate member 60. The plate surface of the first plate member 50 refers to the surface that coincides with the direction in which the first plate member 50 extends when viewed as a whole. Similarly, the plate surface of the second plate member 60 refers to the surface that coincides with the direction in which the second plate member 60 extends when viewed as a whole. The first plate member 50 and the second plate member 60 are each attached to the shaft member 42. The first plate member 50 and the second plate member 60 are configured to rotate relative to each other around the central axis A. In this modified example, the first plate member 50 and the second plate member 60 are configured like a hinge that rotates relative to each other around the central axis A.

[0047] The first plate member 50 has a first rear end portion 52. The first rear end portion 52 is the end portion of the first plate member 50 that is furthest from the central axis A. More specifically, the first rear end portion 52 is the end portion of the first plate member 50 that is furthest from the central axis A in the direction in which it extends and perpendicular to the central axis A. The second plate member 60 has a second rear end portion 62. The second rear end portion 62 is the end portion of the second plate member 60 that is furthest from the central axis A. More specifically, the second rear end portion 62 is the end portion of the second plate member 60 that is furthest from the central axis A in the direction in which it extends and perpendicular to the central axis A.

[0048] In this modified example, the anchors 31 and 32 are configured to change from a folded state to an unfolded state. The folded state is the state in which the anchors 31 and 32 are most closed. In other words, the folded state is the state in which the first rear end 52 and the second rear end 62 are closest to each other. In the folded state, the first rear end 52 and the second rear end 62 may or may not be in contact with each other. The unfolded state is the state in which the anchors 31 and 32 are most unfolded. In other words, the unfolded state is the state in which the first rear end 52 and the second rear end 62 are furthest apart from each other.

[0049] The first plate member 50 has a first inner surface 54 and a first outer surface 56. The first inner surface 54 is the surface that faces the second plate member 60 when folded. The first outer surface 56 is the surface that faces away from the second plate member 60 when folded. The second plate member 60 has a second inner surface 64 and a second outer surface 66. The second inner surface 64 is the surface that faces the first plate member 50 when folded. The second outer surface 66 is the surface that faces away from the first plate member 50 when folded. When folded, the first inner surface 54 and the second inner surface 64 face each other, and the first outer surface 56 and the second outer surface 66 face generally opposite each other.

[0050] One end of the tension member 24 is attached to the shaft member 42. Preferably, the tension member 24 is attached to multiple locations on the shaft member 42. For example, the tension member 24 may be attached to two locations at both ends of the shaft member 42. Alternatively, the tension members 24 attached to two locations at both ends of the shaft member 42 may be connected to each other and configured to be pulled by a single tension member 24.

[0051] The angle θ1 between the first inner surface 54 and the second inner surface 64 in the unfolded state (see Figure 11) may be, for example, between 90 degrees and 180 degrees. The angle θ1 is measured in a plane perpendicular to the central axis A. Furthermore, the angle θ1 is the angle that does not include the plate members 50 and 60 among the two angles formed between the first inner surface 54 and the second inner surface 64.

[0052] Referring to Figures 13 to 20, the installation method of the anchor device 30 in this modified example will be explained. Figures 13 to 20 describe an example in which both the first anchor 31 and the second anchor 32 are deployable anchors, but it is also possible for only one of the first anchor 31 or the second anchor 32 to be a deployable anchor.

[0053] First, the anchor device installation system 20 is prepared (preparation step). In the preparation step, the first anchor 31 is prepared in a folded state. Next, as shown in Figure 13, the first anchor 31 is placed in a predetermined position above the location where it is to be buried (first anchor 31 placement step). At this time, the first anchor 31 and the penetration device 22 are suspended and held from a workboat 16 floating on the water layer W. In the folded state, the first inner surface 54 and the second inner surface 64 of the first anchor 31 face each other and are in contact with each other.

[0054] As shown in Figure 14, the first anchor 31 is installed in the ground layer G while in its folded state (first installation step). Specifically, the first anchor 31 is driven into the ground layer G using the penetration device 22. The first anchor 31 has its smallest maximum cross-sectional area when it is in its folded state. Therefore, the first anchor 31 can be driven to a deeper position in the ground layer G.

[0055] As shown in Figure 15, the penetration device 22 is lifted up by pulling the tension member 24 with the workboat 16.

[0056] As shown in Figure 16, the first anchor 31 is deployed. When the tension member 24 (connecting member 34) is pulled, the shaft member 42 is pulled by the tension member 24. At this time, the soil and sand constituting the ground layer G enter the space between the first plate member 50 and the second plate member 60, causing the first plate member 50 and the second plate member 60 to separate from each other. When the tension member 24 is pulled further, the first anchor 31 becomes deployed. That is, the first anchor 31 becomes fully deployed. In the deployed state, the projected area of ​​the first anchor 31 is largest when viewed from the direction in which the tension member 24 (connecting member 34) extends. Therefore, in the deployed state, the first anchor 31 generates a large holding force.

[0057] As shown in Figure 17, the second anchor 32 is positioned in a predetermined location (second anchor 32 positioning step). At this time, the second anchor 32 and the penetration device 22 are suspended and held from the workboat 16 floating on the water layer W. In this embodiment, the towing device 36 is attached to the second anchor 32. The second anchor 32 is connected to the first anchor 31 by a connecting member 34.

[0058] As shown in Figure 18, the second anchor 32 is installed in the ground layer G (second installation step). Specifically, the second anchor 32 is driven into the ground layer G using the penetration device 22. The second anchor 32 has its smallest maximum cross-sectional area when folded. Therefore, the second anchor 32 can be driven to a deeper position in the ground layer G. In addition, the second anchor 32 can be brought closer to the first anchor 31 by pulling the connecting member 34 using the traction device 36. The mechanism for driving the second anchor 32 to a deeper position in the ground layer G by pulling the connecting member 34 is the same as the example explained with reference to Figure 7, so a detailed explanation is omitted.

[0059] As shown in Figure 19, the penetration device 22 is lifted up by pulling the tension member 24 with the workboat 16.

[0060] Subsequently, the second anchor 32 is deployed as shown in Figure 20. The details of the deployment operation of the second anchor 32 are the same as those for the first anchor 31, so a detailed explanation is omitted.

[0061] In the modified anchor device 30 and anchor device installation system 20, the first anchor 31 and / or second anchor 32 each include a shaft member 42 that extends along a central axis A and to which a connecting member 34 is attached, and a first plate member 50 and a second plate member 60 configured to be rotatable relative to each other about a central axis A. The first plate member 50 has a first rear end portion 52 that is furthest from the central axis A in the direction in which the first plate member 50 extends and perpendicular to the central axis A, and the second plate member 60 has a second rear end portion 62 that is furthest from the central axis A in the direction in which the second plate member 60 extends and perpendicular to the central axis A. The configuration allows for a change from a folded state in which the first rear end portion 52 and the second rear end portion 62 are close together to an unfolded state in which the first rear end portion 52 and the second rear end portion 62 are separated.

[0062] With this anchor device 30 and anchor device installation system 20, the anchors 31 and 32 have their smallest maximum cross-sectional area when folded. Therefore, the anchors 31 and 32 can be driven deeper into the ground layer G. Furthermore, the anchors 31 and 32 can be unfolded after being driven into the ground layer G. In other words, anchors 31 and 32 with a larger maximum cross-sectional area can be placed at a deeper location in the ground layer G. As a result, the anchor device 30 can exert a greater holding force.

[0063] In particular, it is preferable that the first anchor 31 is a deployable anchor, because the large holding force of the first anchor 31 allows the second anchor 32 to be pulled downward with great force.

[0064] Figures 21 to 24 show other modified examples of the anchor device 30. In the examples shown in Figures 21 to 24, the anchor device 30 includes a pulley 38 that is attached to the first anchor 31 or the second anchor 32 and around which a portion of the connecting member 34 is wound.

[0065] In the example shown in Figure 21, a pulley 38 is attached to the first anchor 31. A traction device 36 is attached to the second anchor 32. One end of the connecting member 34 is attached to the second anchor 32. Part of the connecting member 34 is wrapped around the pulley 38, and the other end of the connecting member 34 is attached to the traction device 36.

[0066] In the example shown in Figure 22, a pulley 38 is attached to the second anchor 32. A traction device 36 is attached to the first anchor 31. One end of the connecting member 34 is attached to the first anchor 31. Part of the connecting member 34 is wrapped around the pulley 38, and the other end of the connecting member 34 is attached to the traction device 36.

[0067] In the example shown in Figure 23, a pulley 38 is attached to the first anchor 31. A traction device 36 is attached to the penetration device 22. One end of the connecting member 34 is attached to the second anchor 32. Part of the connecting member 34 is wrapped around the pulley 38, and the other end of the connecting member 34 is attached to the traction device 36.

[0068] In the example shown in Figure 24, a pulley 38 is attached to the first anchor 31. A towing device 36 is attached to the workboat 16. One end of the connecting member 34 is attached to the second anchor 32. Part of the connecting member 34 is wrapped around the pulley 38, and the other end of the connecting member 34 is attached to the towing device 36.

[0069] In the examples shown in Figures 21 to 24, the pulley 38 functions as a movable pulley. Therefore, when the connecting member 34 is pulled by the traction device 36, the second anchor 32 can be pulled toward the first anchor 31 with a traction force twice that of the traction device 36 itself. Consequently, in the process of installing the second anchor 32 in the ground layer G (second installation process) when installing the anchor device 30, it becomes possible to penetrate the second anchor 32 to a greater depth within the ground layer G. Furthermore, when penetrating the second anchor 32 to a predetermined depth within the ground layer G, a penetration device 22 with a smaller penetration force F can be used.

[0070] In the examples shown in Figures 21 and 22, the anchor device 30 includes a traction device 36. Compared to the case where the traction device 36 is installed at a separate location, as in the examples shown in Figures 23 and 24, the loss of traction force from the traction device 36 can be reduced. Therefore, the efficiency of the traction force when the traction device 36 pulls the connecting member 34 can be improved.

[0071] On the other hand, in the examples shown in Figures 23 and 24, the towing device 36 can be recovered after the anchor device 30 has been buried. Therefore, the towing device 36 can be reused.

[0072] The anchor device 30 and anchor device installation system 20 of this modified example further include a pulley 38 that is attached to the first anchor 31 or the second anchor 32 and around which a portion of the connecting member 34 is wrapped.

[0073] With this anchor device 30 and anchor device installation system 20, when the connecting member 34 is pulled by the traction device 36, the second anchor 32 can be pulled toward the first anchor 31 with a greater traction force than the traction force of the traction device 36 itself. Therefore, in the process of installing the second anchor 32 in the ground layer G (second installation process) when installing the anchor device 30, it becomes possible to penetrate the second anchor 32 to a greater depth in the ground layer G. In addition, when penetrating the second anchor 32 to a predetermined depth in the ground layer G, a penetration device 22 with a smaller penetration force F can be used.

[0074] The anchor device 30 may also be equipped with a plurality of pulleys 38. In particular, the anchor device 30 may be equipped with a plurality of pulleys 38 that function as movable pulleys. In this case, when the connecting member 34 is pulled by the traction device 36, the second anchor 32 can be pulled toward the first anchor 31 with a traction force greater than the traction force of the traction device 36 itself.

[0075] Furthermore, in the example described with reference to Figures 2 to 20, where the anchor device 30 does not have a pulley 38, the towing device 36 may be attached to the second anchor 32, or the towing device 36 may be attached to the penetration device 22, or the towing device 36 may be attached to the workboat 16. [Explanation of Symbols]

[0076] 10 Wind power generation equipment 11 Blades 12 Nacer 13 Towers 14 Support part 16 Workboats 20 Anchor device installation system 22 Penetration device 24. Tensile members 30 Anchor device 31. First Anchor 32. Second Anchor 34 Connecting member 36 Traction device 38 Pulley 42 Shaft member 50 1st plate member 52 1st rear end 54 First Inner Surface 56 1st outer surface 60 Second plate member 62 Second rear end 64 Second Inner Self 66 Second outer surface A Center axis G ground layer W water layer

Claims

1. The first anchor and, A second anchor positioned above the first anchor, An anchoring device comprising a connecting member that connects the first anchor and the second anchor.

2. The anchor device according to claim 1, further comprising a traction device for pulling the connecting member.

3. The anchor device according to claim 1, further comprising a pulley attached to the first anchor or the second anchor and around which a part of the connecting member is wrapped.

4. The first anchor and / or the second anchor are A shaft member that extends along the central axis and to which the connecting member is attached, It comprises a first plate member and a second plate member configured to be rotatable relative to each other about the central axis, The first plate member has a first rear end that is furthest from the central axis in a direction that extends along the first plate member and is perpendicular to the central axis, The second plate member has a second rear end that is furthest from the central axis in the direction in which the second plate member extends and in a direction perpendicular to the central axis, The anchor device according to any one of claims 1 to 3, configured to change from a folded state in which the first rear end and the second rear end are close together to an unfolded state in which the first rear end and the second rear end are separated.

5. The first anchor and, The second anchor and, A connecting member that connects the first anchor and the second anchor, A penetration device for penetrating the first anchor and / or the second anchor into the ground layer, An anchor device installation system comprising a towing device for towing the aforementioned connecting member.

6. The anchor device installation system according to claim 5, further comprising a pulley attached to the first anchor or the second anchor and around which a part of the connecting member is wrapped.

7. The first anchor and / or the second anchor are A shaft member that extends along the central axis and to which the connecting member is attached, It comprises a first plate member and a second plate member configured to be rotatable relative to each other about the central axis, The first plate member has a first rear end that is furthest from the central axis in a direction that extends along the first plate member and is perpendicular to the central axis, The second plate member has a second rear end that is furthest from the central axis in the direction in which the second plate member extends and in a direction perpendicular to the central axis, The anchor device installation system according to claim 5 or 6, configured to change from a folded state in which the first rear end and the second rear end are close together to an unfolded state in which the first rear end and the second rear end are separated.

8. The first anchor and, A second anchor positioned above the first anchor, A method for installing an anchor device comprising a connecting member that connects the first anchor and the second anchor, The first installation step involves installing the first anchor within the ground layer, The process includes a second installation step of installing the second anchor within the ground layer, An anchoring device installation method comprising, in the second installation step, bringing the second anchor closer to the first anchor by pulling the connecting member using a traction device.

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