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EP-4737298-A1 - ANCHOR DEVICE, ANCHOR SYSTEM, AND METHOD FOR INSTALLING ANCHOR SYSTEM

EP4737298A1EP 4737298 A1EP4737298 A1EP 4737298A1EP-4737298-A1

Abstract

An anchor device (20) includes: a shaft member (22) extending along a central axis (A) and receiving attachment of a tension member (85); and a first plate member (30) and a second plate member (40) configured to be rotatable relative to each other about the central axis (A), in which the first plate member (30) includes a first back end portion (31) farthest from the central axis (A) in a direction in which the first plate member (30) extends and a direction orthogonal to the central axis (A), the second plate member (40) includes a second back end portion (41) farthest from the central axis (A) in a direction in which the second plate member (40) extends and a direction orthogonal to the central axis (A), and the anchor device (20) is configured to be able to change from a folded state in which the first back end portion (31) and the second back end portion (41) are close to each other to an unfolded state in which the first back end portion (31) and the second back end portion (41) are far from each other.

Inventors

  • NOMURA, SHUN
  • TANI, KAZUO
  • SATO, ARATA

Assignees

  • National University Corporation Tokyo University of Marine Science And Technology

Dates

Publication Date
20260506
Application Date
20240701

Claims (13)

  1. An anchor device comprising: a shaft member extending along a central axis and configured to receive attachment of a tension member; and a first plate member and a second plate member configured to be rotatable relative to each other about the central axis, wherein the first plate member includes a first back end portion farthest from the central axis in a direction in which the first plate member extends and a direction orthogonal to the central axis, the second plate member includes a second back end portion farthest from the central axis in a direction in which the second plate member extends and a direction orthogonal to the central axis, and the anchor device is configured to be able to change from a folded state in which the first back end portion and the second back end portion are close to each other to an unfolded state in which the first back end portion and the second back end portion are far from each other.
  2. The anchor device according to claim 1, wherein the first plate member includes a first outer surface that is oriented away from the second plate member in the folded state, the second plate member includes a second outer surface that is oriented away from the first plate member in the folded state, the first outer surface includes a first inclined outer surface that approaches the second plate member as the first inclined outer surface approaches the shaft member in the folded state, and the second outer surface includes a second inclined outer surface that approaches the first plate member as the second inclined outer surface approaches the shaft member in the folded state.
  3. The anchor device according to claim 1, wherein the first back end portion includes a first inclined end surface that approaches the second plate member as the first inclined end surface approaches the shaft member in the folded state, and the second back end portion includes a second inclined end surface that approaches the first plate member as the second inclined end surface approaches the shaft member in the folded state.
  4. The anchor device according to claim 1, further comprising: a third plate member connected to the first plate member and configured to be rotatable relative to the first plate member; and a fourth plate member connected to the second plate member and configured to be rotatable relative to the second plate member.
  5. The anchor device according to claim 1, further comprising a restriction portion configured to restrict an angle between the first plate member and the second plate member to a predetermined angle or less, in the unfolded state.
  6. The anchor device according to claim 5, wherein the restriction portion includes contact portions that come into contact with each other when the angle between the first plate member and the second plate member becomes the predetermined angle.
  7. The anchor device according to claim 5, wherein the restriction portion includes a connection member that connects the first plate member and the second plate member to each other.
  8. An anchor device comprising: a shaft member extending along a central axis and configured to receive attachment of a tension member; a first frame member and a second frame member configured to be rotatable relative to each other about the central axis; and a pressure receiving member caused to extend across the first frame member and the second frame member, wherein the first frame member includes a first back end portion farthest from the central axis in a direction orthogonal to the central axis, the second frame member includes a second back end portion farthest from the central axis in a direction orthogonal to the central axis, and the anchor device is configured to be able to change from a folded state in which the first back end portion and the second back end portion are close to each other to an unfolded state in which the first back end portion and the second back end portion are far from each other.
  9. The anchor device according to claim 8, further comprising: a third frame member connected to the first frame member and configured to be rotatable relative to the first frame member; and a fourth frame member connected to the second frame member and configured to be rotatable relative to the second frame member.
  10. The anchor device according to claim 8, further comprising a restriction portion configured to restrict an angle between the first frame member and the second frame member to a predetermined angle or less, in the unfolded state.
  11. The anchor device according to claim 10, wherein the restriction portion includes a connection member that connects the first frame member and the second frame member to each other.
  12. An anchor system comprising: the anchor device according to any one of claims 1 to 11; and a tension member attached to the shaft member.
  13. A method of installing an anchor system, the method comprising: a step of placing the anchor device of the anchor system according to claim 12 into a ground layer in the folded state; and a step of causing the anchor device to change from the folded state to the unfolded state by pulling the tension member.

Description

TECHNICAL FIELD The present invention relates to an anchor device, an anchor system, and a method of installing the anchor system. BACKGROUND ART Conventionally, a wind power generator is known that is used in a floating state on a sea. Such a wind power generator is also called a floating offshore wind power generator. The floating offshore wind power generator includes a floating structure and a mooring system. The floating structure includes blades that rotate by receiving wind, a nacelle housing a power generator, a tower that supports the nacelle, and a support for supporting the tower. The mooring system is a system for mooring the floating structure to the ground. The mooring system includes an anchor placed into the ground and a mooring line connecting the floating structure and the anchor. The mooring line is, for example, a wire rope, and connects the support of the floating structure and the anchor. JP S61-7493 U discloses an example of a mooring system. As an anchor included in a mooring system, a pile anchor, a suction anchor, a drag anchor, a suction embedment anchor, or the like is known. Although the pile anchor and the suction anchor are relatively large and have an advantage of being able to exert high holding power, the pile anchor and the suction anchor have disadvantages that a large ship or a large construction machine is required at the time of installation, and that installation cost increases and an installation period becomes long. In addition, although the drag anchor and the suction embedment anchor have an advantage that a large ship or a large construction machine is not required at the time of installation, the drag anchor and the suction embedment anchor have a disadvantage that it is difficult to exert high holding power because the anchors are relatively small. Note that the holding power means a force that is generated when a tensile force acts on the anchor via a mooring line, and that resists when the anchor moves, slides, or is pulled out from the ground in which the anchor is installed. SUMMARY OF THE INVENTION The present invention has been made in view of such points, and an object of the present invention is to provide an anchor device, an anchor system, and a method of installing the anchor system that enable size reduction at a time of installation and that enable exertion of high holding power after the installation. An anchor device according to the present invention is [1] an anchor device including: a shaft member extending along a central axis and configured to receive attachment of a tension member; anda first plate member and a second plate member configured to be rotatable relative to each other about the central axis,in whichthe first plate member includes a first back end portion farthest from the central axis in a direction in which the first plate member extends and a direction orthogonal to the central axis,the second plate member includes a second back end portion farthest from the central axis in a direction in which the second plate member extends and a direction orthogonal to the central axis, andthe anchor device is configured to be able to change from a folded state in which the first back end portion and the second back end portion are close to each other to an unfolded state in which the first back end portion and the second back end portion are far from each other. An anchor device according to the present invention is [2] the anchor device according to [1], in which the first plate member includes a first outer surface that is oriented away from the second plate member in the folded state,the second plate member includes a second outer surface that is oriented away from the first plate member in the folded state,the first outer surface includes a first inclined outer surface that approaches the second plate member as the first inclined outer surface approaches the shaft member in the folded state, andthe second outer surface includes a second inclined outer surface that approaches the first plate member as the second inclined outer surface approaches the shaft member in the folded state. An anchor device according to the present invention is [3] the anchor device according to [1] or [2], in which the first back end portion includes a first inclined end surface that approaches the second plate member as the first inclined end surface approaches the shaft member in the folded state, andthe second back end portion includes a second inclined end surface that approaches the first plate member as the second inclined end surface approaches the shaft member in the folded state. An anchor device according to the present invention is [4] the anchor device according to any one of [1] to [3], further including: a third plate member connected to the first plate member and configured to be rotatable relative to the first plate member; anda fourth plate member connected to the second plate member and configured to be rotatable relative to the second plate