Anchor system
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- REFLEX MARINE LTD
- Filing Date
- 2023-07-17
- Publication Date
- 2026-06-16
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an anchor system for fixing an anchor pile in a boring hole. Specifically, it relates to an anchor system for fixing an anchor pile in a hole, and more specifically, it uses a tether to improve lateral resistance and prevent or reduce penetration of the hole wall. This anchor system is suitable for use on the seabed. Furthermore, it includes a method for installing the anchor system.
Background Art
[0002] In the relevant technical field, various anchor systems such as driving, suction, and embedded types are known. However, it has been found that such systems have several drawbacks. General anchor systems are limited in use for specific seabed grounds. In floating offshore wind power (FOW) projects, geological conditions can vary greatly at one site. As a result, conventional anchor systems may not be suitable for use throughout the site. Furthermore, in offshore wind power projects, a large number of anchor foundations are required, so it is costly to use conventional anchor systems. Conventional anchor systems use a tether extending from the anchor pile, such as a mooring cable. The tether embedded in the boring hole is subjected to a large horizontal load. As a result, over time, the tether will cut through the soil around the upper part of the anchor. This can damage the tether and also cause the tether to slack, and the reliability may decrease over time. One of the objectives of the embodiments of the present invention is to avoid or mitigate these and other drawbacks of known anchor systems for mooring. and other drawbacks.
Summary of the Invention
[0003] According to a first aspect of the present invention, there is provided a system for mooring including the following. An anchor pile configured to be embedded in a first lower portion of a boring hole, and composed of a first rod-shaped body having an upper end and a lower end. A member for relieving horizontal load is spaced from the upper end of the first rod-shaped body of the anchor pile and configured to be embedded in a second upper portion of the boring hole. This member for relieving horizontal load has a second rod-shaped body, and the upper end is configured to communicate with a mooring tether that receives the horizontal load, and has a lower end opposite thereto. An intermediate member that connects the lower end of the second rod-shaped body of the member for relieving horizontal load and the upper end of the first rod-shaped body of the anchor pile. Since the second rod-shaped body of the member for relieving horizontal load generates hoop stress in the second upper portion of the hole wall during use, it is configured to contact the wall portion around the second upper portion of the hole wall without penetrating into the second upper portion of the hole wall. and is configured to contact the wall portion around the second upper portion of the hole wall without penetrating into the second upper portion of the hole wall. The anchor system of the present invention can securely and effectively fix a tether (e.g., a mooring cable), and provides a solution that reduces the risk of damage and failure of the tether that occur over time. The anchor system of the present invention can be adapted to a wide range of geological strata. and provides a solution that reduces the risk of damage and failure of the tether that occur over time. The anchor system of the present invention can be adapted to a wide range of geological strata. The anchor system of the present invention can withstand high loads, such as exceeding 1000 tons, for example. The anchor system of the present invention can withstand high loads, such as exceeding 1000 tons, for example. It is. It can also withstand a vertical load tension mooring system from a higher angle mooring. This system is an onshore or offshore anchor system and is also assumed to be used as an offshore anchor system. It is preferable that the boring hole be provided on the seabed. It is preferably provided with steps. The first lower part preferably has a smaller cross-section than the second upper part. The first lower part can be drilled quickly and efficiently, for example, if it has a smaller cross-sectional dimension. The second upper part preferably has a larger cross-sectional dimension than the first lower part. It is also preferable to have a larger contact surface area (compared to the first lower part), which improves the transmission of lateral load from the lateral load transfer member to the surrounding hole wall part, thereby forming a more improved lateral resistance. The second upper part is preferably configured to have a larger cross-sectional dimension. This is, for example, because it facilitates the accommodation of additional mechanical devices for connecting the mooring cable to the lateral load transfer member. The first lower part of the boring hole has a cross-sectional dimension of at least 300 mm, preferably about 310 mm. The first lower part of the boring hole has a cross-sectional dimension of 500 mm or less, preferably 450 mm or less. The first lower part of the boring hole has a cross-sectional dimension of 300 mm or more and 500 mm or less, preferably 310 mm or more and 450 mm or less. The second upper part of the boring hole has a cross-sectional dimension that is at least 10%, preferably at least 20%, more preferably at least 30% larger than the cross-sectional dimension of the first lower part. The second upper part is preferably configured to have a larger cross-sectional dimension. This is, for example, because it facilitates the accommodation of additional mechanical devices for connecting the mooring cable to the lateral load transfer member. The first lower part of the boring hole has a cross-sectional dimension of at least 300 mm, preferably about 310 mm. The first lower part of the boring hole has a cross-sectional dimension of 500 mm or less, preferably 450 mm or less. The first lower part of the boring hole has a cross-sectional dimension of 300 mm or more and 500 mm or less, preferably 310 mm or more and 450 mm or less. The first lower part of the boring hole has a cross-sectional dimension of at least 300 mm, preferably about 310 mm. The first lower part of the boring hole has a cross-sectional dimension of 500 mm or less, preferably 450 mm or less. The first lower part of the boring hole has a cross-sectional dimension of 300 mm or more and 500 mm or less, preferably 310 mm or more and 450 mm or less. The first lower part of the boring hole has a cross-sectional dimension of 300 mm or more and 500 mm or less, preferably 310 mm or more and 450 mm or less. The cross-sectional dimension is. The second upper part of the boring hole has a cross-sectional dimension that is at least 10%, preferably at least 20%, more preferably at least 30% larger than the cross-sectional dimension of the first lower part. The second upper part is preferably configured to have a larger cross-sectional dimension. This is, for example, because it facilitates the accommodation of additional mechanical devices for connecting the mooring cable to the lateral load transfer member. , for example, the cross-sectional dimension may be 100% larger than the cross-sectional dimension of the first lower part. The anchor pile is installed in the boring hole of the high-strength stratum to increase the resistance. For example , it is at a depth of at least 50 m from the ground surface (for example, a hole on the seabed). It is preferably installed at a depth between 50 m and 80 m below the water surface (for example, below the seabed ). At this time, it is configured to receive the vertical load from the mooring object. The cross-sectional dimension of the second rod-shaped body of the member for releasing the horizontal load to others is preferably larger than the cross-sectional dimension of the first rod-shaped body of the anchor pile. In one embodiment, the boring hole has an inwardly protruding abutment surface located between the first lower part and the second upper part of the boring hole. In one embodiment, the second lower end of the second rod-shaped body of the member for releasing the horizontal load to others is configured to be received and contacted by the inwardly protruding abutment surface. The member for releasing the horizontal load to others is configured to reduce the lateral force of the load from the mooring object (that is, transmit the lateral force of the load to the surrounding hole wall portion). In one embodiment, when the member for releasing the horizontal load to others is arranged in the second upper part of the hole, it is installed at a position having sufficient lateral resistance to prevent the member for releasing the horizontal load to others from penetrating the hole wall portion. It is desirable to install the member for releasing the horizontal load to others at the highest point in the hole where the member for releasing the horizontal load to others maintains a stable state (that is, does not penetrate the hole wall). The second rod-shaped body of the member for releasing the horizontal load to others is configured to increase the frictional resistance during use and / or effectively transmit the lateral force to generate hoop stress in the adjacent part of the hole. To cause it, it is desirable to create an interference fit within the second upper portion of the hole. The side portion of the second rod-shaped body of the member for releasing the horizontal load to another may include ribs or rib-like portions. These ribs can each define a longitudinal axis. The longitudinal axes of the rib-like portions may be aligned with each other or spaced apart from each other. The rib portions extend substantially parallel to the longitudinal axis of the second rod-shaped body of the member for releasing the horizontal load to another. In an embodiment, the lower end of the second rod-shaped body of the member for releasing the horizontal load to another is tapered. For example, it may be conical. This lower end portion may extend into the first lower portion of the hole, for example, beyond the abutment surface provided between the first and second portions of the hole. The member for releasing the horizontal load to another can be rotatably and / or pivotably connected to the lateral load mooring tether. In an embodiment, the member for releasing the horizontal load to another is a hinge disposed at the upper end of the elongated body. This anchor system may further include an intermediate connector having a first end of a first hinge for connecting to a mooring tether that receives a horizontal load and a second opposing end of a second hinge connected to the upper end of the second rod-shaped body of the member for releasing the horizontal load to another. The first hinge preferably extends substantially parallel to a second axis of rotation defined by the second hinge and defines a first axis of rotation that is spaced apart. The middle part is preferably rigid and is installed so as not to contact the hole wall part. This cut The dimension of the surface is preferably smaller than the dimensions of the cross-sections of the first and second rod-shaped bodies. This middle part is preferably composed of an elongated tension member, such as a wire or a tube. The tether may have a first end connectable to the upper end of the second rod-shaped body of the member for relieving the horizontal load to others, and a second opposite end for connecting to the tether termination end. The tether termination is preferably configured to be a connection point of the main mooring line and may have flexibility. Furthermore, in order to protect the tether from the frictional force resulting from the lateral loading force from the main mooring line or the like, which causes the tether to move (or be cut) through the surrounding formation, it can be encapsulated within an outer layer for protection. The second rod-shaped body of the member for relieving the horizontal load to others is preferably installed within the second upper part of the boring hole in order to remove the lateral force from the tether. This member for relieving the horizontal load to others further defines a tube for passing a liquid extending between the upper end and the lower end of the second rod-shaped body. The tube for passing the liquid may be configured to supply a fixing medium to the first lower part of the hole. is preferably installed within the second upper part of the boring hole in order to remove the lateral force from the tether. is desirable. This member for relieving the horizontal load to others further defines a tube for passing a liquid extending between the upper end and the lower end of the second rod-shaped body. The tube for passing the liquid may be configured to supply a fixing medium to the first lower part of the hole. is sometimes configured to supply a fixing medium to the first lower part of the hole. In a second aspect of the present invention, a method for installing an anchor system is provided, including: Excavate a boring hole. This boring hole consists of a first lower part and a second upper part, The dimension of the cross-section of the first lower part is smaller than the dimension of the cross-section of the second upper part, and an abutment surface protruding inwardly is provided at the transition point located therebetween. using the anchor system described herein. using the anchor system described herein. The step of introducing and embedding the anchor pile into the first lower part of the hole. Spaced apart from the anchor pile a member for releasing the horizontal load to another in the second upper part of the hole and arranging such that the side part of the second rod-shaped body of the member for releasing the horizontal load to another abuts against the wall of the second upper part of the hole, thereby generating hoop stress without penetrating into the second upper part of the hole wall in this way. The step of arranging. In certain embodiments, the member for releasing the horizontal load to another installs the lower end of its second rod-shaped body within the second upper part of the hole and is configured to abut against the inwardly protruding abutment surface provided at the transition point between the first part and the second part of the hole. The method of the present invention is a simple and reliable installation method. The boring hole can be drilled in the seabed. It is desirable that the boring hole is a stepped boring hole. The method may introduce a fixing medium, thereby fixing the anchor pile at a predetermined position within the first lower part of the boring hole. The fixing medium is, for example, cement. At this time, the fixing medium is installed in the first lower part and can be positioned so as not to extend beyond the transition point between the first part and the second part of the boring hole. Such an arrangement enables, for example, at least one connector and / or the mooring tether communicating with the upper end of the member for releasing the horizontal load to another to move freely. However, it should be understood that the fixing medium may extend beyond this transition point into the second upper part of the hole. For example, in certain embodiments, for releasing the horizontal load to another To fix at least a part of the member at a predetermined position inside the upper part of the hole, from the first lower part of the hole Some are installed in the hole so as to extend from the first lower part of the hole to the second upper part of the hole. However, it is desirable to install it in the boring hole so as not to exceed the upper end of the member for discharging the horizontal load to others. to do. Further, after positioning the member for discharging the horizontal load to others at the second upper part of the boring hole, It may be placed. Furthermore, it can be said that it is desirable to install it through a pipe for passing a liquid extending between the upper end and the lower end of the second rod-shaped main body of the member for discharging the horizontal load to others. to say. This method may further include attaching the upper end of the second rod-shaped main body of the member for discharging the horizontal load to others to the mooring tether to which the load is applied in the lateral direction. include In one embodiment, the side portion of the second rod-shaped main body of the member for discharging the horizontal load to others is abutted (for example, embedded) against the wall portion around the second upper portion of the boring hole. There is also something.
Brief Description of Drawings
[0004]
Figure 1
Figure 2
Mode for Carrying Out the Invention
[0005] As shown in the figure, the anchor system 1 is composed of an anchor pile (not shown) configured to be embedded in the first lower part 3 of the boring hole 2 drilled in the seabed. Anchor pile consists of The (not shown) consists of a first rod-shaped body having an upper end and a lower end. This anchor system 1 is installed at an interval from the upper end of the first rod-shaped body (not shown) of the anchor pile and is configured in use to be embedded in the second upper portion 4 of the boring hole 2. It further includes a member 5 for releasing the horizontal load to others. The member 5 for releasing the horizontal load to others consists of a second rod-shaped body 6 having an upper end portion 7 configured to communicate with the horizontal load mooring tether 8 and an opposing lower end portion 9. The second rod-shaped body 6 is substantially cylindrical. The tether 8 has a first end portion and a second opposing end portion. The first end portion is connected to the upper end portion 9 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to others. The second opposing end portion is connected to a tether end portion (not shown). The latter may be, for example, a connection point of the main mooring line. The tether 8 is flexible and is wrapped in an outer layer for protecting the tether 8 from the frictional force resulting from the lateral load force from the main mooring line. The present anchor system 1 further includes an intermediate portion 10 that connects the lower end 9 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to others and the upper end of the first rod-shaped body of the anchor pile. This intermediate portion 10 is rigid and creates a space between the upper end of the first rod-shaped body of the anchor pile and the lower end 9 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to others. The second elongated body 6 of the member 5 for releasing the horizontal load to others is received and configured to be in contact with the protruding abutment surface 12 provided at the transition point between the first lower portion 3 and the second upper portion 4 of the hole 2 during use. The dimension of the cross-section of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to others is that of the anchor pile is larger than the dimension of the cross-section of the first rod-shaped body. The dimension of the cross-section of the second rod-shaped body 6 is slightly smaller than the dimension of the cross-section of the upper part of the hole portion, thereby firmly joining and efficiently transmitting the lateral force from the member 5 for releasing the horizontal load to others to the peripheral portion of the hole. The second rod-shaped body 6 of the member 5 for releasing the horizontal load to others has side portions 11 and extends between the upper end portion 7 and the lower end portion 9. This is configured to contact the wall portion around the second upper portion 4 of the hole wall 2 during use, so that, without penetrating the second upper portion 4 of the hole wall 2, a hoop stress is generated in the second upper portion 4 of the hole wall 2. In the illustrated embodiment, a part of the lower end 9 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to others extends to the first lower portion of the boring hole 2. However, the lower end portion 9 of the second rod-shaped body 6 may be located at the transition point between the first lower portion and the second upper portion 4 (for example, adjacent to the abutment surface 12 provided at the transition point therebetween), or adjacent to that transition point. In the illustrated embodiment, the lower end portion 9 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to others is tapered such as conical. However, the lower end portion 9 of the second rod-shaped body 6 may have any suitable shape. The side portions 11 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to others are composed of a plurality of rib portions 14 installed at intervals. The rib portions 14 each define a longitudinal axis. The rib portions 14 are arranged with their longitudinal axes coinciding and at intervals. The longitudinal axes of the rib portions 14 are aligned and arranged at intervals. extends (substantially) parallel to the longitudinal axis of the second rod-shaped body 6 of the member 5 for discharging the horizontal load to another place. The intermediate portion 10 does not contact the wall portion of the boring hole 2. The cross-sectional dimension of the intermediate portion 10 is considerably smaller than the cross-sectional dimensions of the first and second rod-shaped bodies. This arrangement reduces the frictional force generated during the installation of the anchor system while providing the desired rigidity between the bodies. The member 5 for discharging the horizontal load to another place is rotatably connected to the mooring tether 8 that receives the horizontal load. The member 5 for discharging the horizontal load to another place consists of a hinge 14 arranged at the upper end portion 7 of the elongated body 6. As shown in FIGS. 2A and 2B, the anchor system 1 includes an intermediate connecting portion 15 having a first end portion 16 and a second opposing end portion 18. The first end portion 16 provides a first hinge 15a for connecting to the mooring tether 8 that receives the load in the lateral direction, and the second opposing end portion 18 provides a second hinge 14b connected to the upper end portion 7 of the second rod-shaped body 6 of the member for discharging the horizontal load to another place. The first hinge 14a defines a first rotation axis that extends substantially parallel to the second rotation axis formed by the second hinge 14b and extends at a distance from the second rotation axis. This arrangement causes the tether 8 to be spaced from the central longitudinal axis defined between the opposing end portions 7, 9 of the elongated body 6 of the member 5 for discharging the horizontal load to another place. Furthermore, the member 5 for discharging the horizontal load to another place defines a tube 18 for passing a liquid extending between the upper end portion 7 and the lower end portion 9 of the second rod-shaped body 6. In the illustrated embodiment, this passage 18 is substantially is centrally located. However, this path 18 may be located at any suitable position, for example, at a distance from the center of the main body 6. The pipe 19 for passing the liquid is configured to form a fixing medium in the first lower part of the hole. In use, first, the boring hole 2 is drilled on the seabed to install the anchor system 1. The bo ring hole 2 consists of a first lower part 3 having a cross-sectional dimension between 300 mm and 500 mm. However, it should be understood that the lower part 3 can have any suitable dimension. The boring hole 2 further includes a second upper part 4 communicating with the first lower part 3. The cross-sectional dimension of the first lower part 3 of the is smaller than the cross-sectional dimension of the second upper part 4, and at the transition point located therebetween, an abutment surface 12 protruding inward is defined. The upper end 9 of the second rod-shaped main body 6 of the member 5 for releasing the horizontal load to others is connected to the horizontal load mooring tether 8. The anchor pile is installed on the first lower surface of the boring hole 2. The anchor pile is installed at a depth within the lower part 3 of the boring hole adjacent to the high-strength formation to increase the resistance force. For example, it is installed at a depth of at least 50 m from the ground surface within the lower part 3 of the boring hole (for example, beneath the seabed). Preferably, it is at a depth between 50 m and 80 m below the ground surface (for example, beneath the seabed). The anchor pile is configured to receive the vertical load from the mooring object. The member 5 for releasing the horizontal load to others is installed within the second upper part 4 of the hole 2. And the lower end 9 of the second rod-shaped main body 6 of the member 5 for releasing the horizontal load to others is configured to be received by the abutment surface 12 protruding inward provided at the transition point. This method further abuts (e.g., embeds) the side portion 11 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to the surrounding wall portion of the second upper portion 4 of the boring hole 2. This also includes. As shown in the figure, a part of the lower end portion 9 of the second rod-shaped body 6 of the member 5 for releasing the horizontal load to the outside is installed so as to extend into the first lower portion 3 of the hole 2. Then, a fixing medium, such as cement, is installed through the fluid path 19 to fix the anchor pile at a predetermined position in the first lower portion 3 of the hole 2. The fixing medium consists of, for example, cement. The fixing medium is introduced into the first lower surface 3 and does not extend beyond the transition point between the first portion and the second portion of the boring hole 2. This fixing medium can be installed after positioning the member for releasing the horizontal load to the second upper portion of the boring hole. The method of the present invention provides a simple and reliable installation methodology. The anchor system of the present invention can be used to effectively and securely fix a tether, such as a mooring cable, and provide a mooring solution with tension over a long period. The anchor system of the present invention can be adapted to a wide range of strata. The member for releasing the horizontal load to the outside resists the lateral force of the load from the mooring and is installed to transmit the lateral force of the load to the surrounding hole wall portion. In one embodiment, it is installed in the second upper portion of the hole at a position having sufficient lateral resistance to prevent penetration of the hole wall portion by the member for releasing the horizontal load to the outside. It is desirable to install the member for releasing the horizontal load to the outside at the highest point in the hole where it maintains a stable state (i.e., does not penetrate the hole wall). The anchor system of the present invention can withstand high loads, such as exceeding 1000 tons for example. . Furthermore, the anchor system of the present invention can be used for high-angle mooring to a vertical load tension mooring system. . This anchor system resists lateral forces by the tether and enables direct transmission to the geological surface surrounding the boring hole. As a result, the anchor system of the present invention reduces the force acting on the tether, thereby reducing the cutting of the tether through the geological surface that occurs in conventional anchor systems. Therefore, the length of the tether required by the anchor system of the present invention is reduced, thereby reducing the material cost, reducing the possibility of damage occurring to the tether as a result of the cutting operation, and thus reducing the labor and cost associated with tether repair and / or replacement over time. Reducing the risk of damage to the anchor pile as a result of tether damage, thereby providing a more reliable anchor system. .
Claims
1. It is an anchor system, An anchor pile configured to be embedded in the first lower portion of a borehole, comprising a first rod-shaped body having an upper end and a lower end, A member for diverting horizontal loads, which is positioned at a distance from the upper end of the first rod-shaped body of the anchor pile when in use and is embedded in the second upper portion of the borehole, comprising a second rod-shaped body having an upper end configured to communicate with a mooring tether that receives horizontal loads when in use, and an opposing lower end, and An intermediate portion connecting the lower end of the second rod-shaped body of the member for releasing the horizontal load to the upper end of the first rod-shaped body of the anchor pile, wherein the second rod-shaped body of the member for releasing the horizontal load to the other has a side portion extending between its upper end and lower end, and this side portion is configured to abut against the surrounding wall portion of the second upper part of the borehole during use and generate hoop stress without penetrating into the second upper part of the wall of the borehole, An anchor system composed of the following.
2. An anchor system according to Claim 1, characterized in that the dimensions of the cross-section of the second rod-shaped body of the member for releasing the horizontal load to another party are larger than the dimensions of the cross-section of the first rod-shaped body of the anchor pile.
3. An anchor system according to Claim 1, wherein the lower end of the second rod-shaped body of the member for releasing the horizontal load is configured to be received by and in contact with an inwardly projecting abutment surface provided at the transition point between the first and second upper parts of the borehole when in use.
4. An anchor system according to Claim 1, wherein the member for distributing the horizontal load is configured to be positioned within the second upper part of the borehole at a location that has sufficient lateral resistance to prevent the member for distributing the horizontal load from penetrating the wall portion of the borehole.
5. The anchor system according to Claim 1, An anchoring system in which a member for dissipating the aforementioned horizontal load is rotatably and / or pivotably connected to the mooring tether subjected to the horizontal load.
6. The anchor system according to claim 5, An anchor system in which a member for distributing the horizontal load elsewhere is provided with a hinge located at the upper end of the elongated body of the member for distributing the horizontal load elsewhere.
7. The anchor system according to claim 6, An anchoring system further comprising an intermediate connector having a first end providing a first hinge for connecting to the mooring tether subjected to a laterally loaded load, and an opposing second end providing a second hinge connected to the upper end of the second rod-shaped body of a member for releasing the horizontal load elsewhere.
8. An anchoring system according to claim 7, wherein the first hinge extends substantially parallel to a second axis of rotation defined by the second hinge and defines a first axis of rotation that is spaced apart from the second axis of rotation.
9. An anchor system according to Claim 1, wherein the side portion of the second rod-shaped body of the member for releasing the horizontal load to another object is provided with a rib portion.
10. An anchor system according to claim 9, wherein the rib portion extends substantially parallel to the longitudinal axis of the second rod-shaped body of the member for distributing the horizontal load elsewhere.
11. An anchor system according to Claim 1, wherein the lower end of the second rod-shaped body of the member for releasing the horizontal load to another object is tapered.
12. An anchor system according to claim 11, wherein the lower end of the member for releasing the horizontal load to another object is conical in shape.
13. An anchor system according to claim 1, wherein the intermediate portion does not come into contact with the wall portion of the borehole.
14. An anchor system according to claim 13, wherein the dimensions of the cross-section of the intermediate portion are smaller than the dimensions of the cross-sections of the first and second rod-shaped bodies.
15. An anchoring system according to claim 1, further comprising a tether having a first end connectable to the upper end of the first rod-shaped body of a member for releasing the horizontal load, and an opposing second end having a connector for engaging with a mooring tether to which a horizontal load has been applied.
16. An anchor system according to claim 1, wherein the member for releasing the horizontal load further defines an open fluid passage extending between the upper and lower ends of the second rod-shaped body.
17. An anchor system according to claim 16, wherein the fluid passage is substantially centrally located and extends substantially parallel to the longitudinal axis of a member for distributing the horizontal load elsewhere.
18. A method for installing an anchor system, A process of drilling a borehole having a first lower portion communicating with a second upper portion, wherein the cross-sectional dimensions of the first lower portion are smaller than those of the second upper portion, and an inwardly projecting abutment surface is provided at the transition point located between them; A step of obtaining the anchor system described in claim 1, The steps include introducing and embedding the anchor pile into the first lower portion of the borehole, and A method for installing an anchor system, comprising the step of arranging a member for releasing the horizontal load elsewhere in the second upper portion of the borehole at a distance from the anchor pile, wherein the side portion of the second rod-shaped body of the member for releasing the horizontal load elsewhere abuts against the wall portion surrounding the second upper portion of the borehole, and is arranged so as to generate hoop stress without penetrating into the second upper portion of the wall of the borehole.
19. The method according to claim 18, wherein at least a portion of the lower end of the second rod-shaped body of the member for releasing the horizontal load extends to the first lower portion of the borehole.
20. A method according to claim 18, further comprising the step of introducing a fixing medium to fix the anchor pile in a predetermined position within the first lower portion of the borehole.
21. The method according to claim 20, wherein the fixing medium is cement.
22. A method according to claim 20, wherein the fixing medium is introduced into the first lower portion and is positioned so as not to extend beyond the transition point between the first and second portions of the borehole.
23. A method according to claim 20, wherein the fixing medium is introduced after the member for releasing the horizontal load is positioned at the second upper part of the borehole.
24. A method according to claim 23, wherein the fixing medium is introduced through an open-ended fluid passage extending between the upper and lower ends of the second rod-shaped body of the member for releasing the horizontal load.
25. A method according to claim 18, further comprising the step of attaching the upper end of the second rod-shaped body of the member for releasing the horizontal load to a mooring tether to which a horizontal load has been applied.