JP2010064648A - Taut mooring float and method for adjusting inclination of taut mooring float - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a taut mooring float and an inclination adjusting method for taut mooring float, not causing inclination of the taut mooring float and restraining the occurrence of a slack to loosen a taut mooring rope when the taut mooring float moves in the horizontal direction by external force such as wind force and tidal stream force in installing the taut mooring float and even in the case of causing unevenness in depth of a lower mooring part under water after installation. <P>SOLUTION: In this taut mooring float 1, a locking part moving means 16 is provided to move the upper locking part 15 in the vertical direction, which restrains at least the partial upper sides of the taut mooring ropes 13a-13d from relatively moving in the horizontal direction to the upper mooring part 12c. The parts in the taut mooring ropes 13a-13d inclined when the taut mooring float 1 moves in the horizontal direction are adjusted to have the same length by the locking part moving means 16, thereby preventing inclination of the taut mooring float 1 when the taut mooring float 1 moves in the horizontal direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention adjusts the length of the portion of the tension mooring line that can be tilted during and after the installation of the tension mooring floating body used as a pedestal for wind power generators, etc. The present invention relates to a tension mooring floating body that can prevent the tension mooring floating body from tilting when the tension mooring floating body moves in a horizontal direction, and a method for adjusting the inclination of the tension mooring floating body.

  With regard to wind power generation, proposals have been made to install a tension mooring floating body (TLP: tension leg platform) on a continental shelf on the coast and to mount a device such as a wind power generator on the tension mooring floating body. For example, as shown in FIG. 8, the floating body 12 that supports the base 11 of the wind power generator includes one or more (four in FIG. 8) tension mooring lines 13 a attached to the floating body 12. It is moored at anchors 14 provided on the bottom 2 of the seabed, lake bottom, riverbed, etc. at ˜13d.

  Generally, the tension mooring floating body 1X is not limited to the wind power generator, but the ballast water is poured into the ballast tank of the floating body 12 or the ballast water is loaded, so that the buoyancy of the floating body 12 is greater than that in the installed state. It moves on the anchor 14 previously installed in the set water area in a state where it is reduced and submerged.

  After the movement, the lower ends of the tension mooring lines 13a to 13d are coupled to the lower mooring part 14c of the anchor 14, and the upper ends of the tension mooring lines 13a to 13d are coupled to the upper mooring part 12c of the floating body 12 corresponding thereto.

  After the coupling, the buoyancy of the floating body 12 is set to a preset buoyancy by discharging the ballast water or removing the ballast while paying attention to the inclination of the upper structure 11 and the floating body 12 on which the upper structure 11 is mounted. Thereby, the inclination of the upper structure 11 and the tension | tensile_strength of tension | tensile_strength mooring lines 13a-13d are adjusted by changing the length of tension | tensile_strength mooring lines 13a-13d. In this installation, the tension mooring floating body 1X is not moistened in the waves so that it does not move up and down, rolls and sways, and the movable range in the horizontal direction falls within the allowable range. The cords 13a to 13d are moored with a preset initial tension (see, for example, Patent Document 1).

  Hereinafter, in FIGS. 9 to 12, only the two tension mooring lines 13 a and 13 c on the diagonal side will be described for easy understanding. As shown in FIG. 9, after the tension mooring lines 13a and 13c are set to a certain length L1 and the tension mooring floating body 12 is installed, the ground of the bottom 2 sinks due to an earthquake or the like, and the amount of settlement is In the case of non-uniformity, that is, when uneven settlement occurs, a difference occurs in the water depth of the lower anchoring portion 14c of the anchor 14 on the bottom 2 of the water. Accordingly, as shown in FIG. 10, the tension mooring floating body 12 is inclined. In order to cope with this, as shown in FIG. 11, the lengths La and Lc of the tension mooring lines 13a and 13c are adjusted by a mechanism for adjusting the length of the tension mooring lines 13a and 13c provided in the tension mooring floating body 12. Adjust so that the tension mooring float 12 is horizontal.

  However, only by adjusting the lengths La and Lc of the tension mooring lines 13a and 13c with respect to this uneven settlement, the lengths La and Lc of the tension mooring lines 13a and 13c are adjusted after the lengths La and Lc are adjusted. Since there is a difference in Lc, each tension mooring line in the tension mooring floating body 12 is moved when the tension mooring floating body 12 is moved (offset) in the horizontal direction by an external force such as wind force or tidal force as shown in FIG. There is a problem that a difference occurs in the amount of sinking in the upper mooring portions 12c and 12c of 13a and 13c, and the tension mooring floating body 12 is inclined (inclination angle α).

In addition, when there are four or more mooring sections of the tension mooring line in the tension mooring floating body, if the length of the tension mooring line varies depending on the mooring section, the tension mooring floating body moves in the horizontal direction. Slack, which is a phenomenon in which tension mooring measures loosen on one of the ropes and the tension becomes zero, is likely to occur, and the possibility of damage to the tension mooring line increases due to the impact load that occurs during the reloading action after this slack occurs There's a problem.
Japanese Patent Laid-Open No. 4-197887

  The present invention has been made in view of the above situation, and the purpose thereof is when the tension mooring floating body is installed and when the depth of the lower mooring portion on the water bottom side is uneven after the installation. However, when the tension mooring floating body moves in the horizontal direction due to external forces such as wind power and tidal current, the tension mooring floating body does not tilt, and the tension mooring lines are tension mooring even if there are four or more mooring parts. An object of the present invention is to provide a tension mooring floating body and a method of adjusting the inclination of the tension mooring floating body that can suppress the occurrence of slack, which is a phenomenon that the rope is loosened.

  The tension mooring floating body for achieving the above object is to connect the upper mooring part on the floating body side and the lower mooring part installed on the bottom of the water with a plurality of tension mooring lines to apply tension to the tension mooring line. In the tension mooring floating body that is held in position, at least a part of the upper side of the tension mooring line is prevented from moving relative to the upper mooring part in the horizontal direction, or on the lower side of the tension mooring line. A lower locking portion that suppresses relative movement in the horizontal direction with respect to the lower mooring portion, and a locking portion that moves the upper locking portion or the lower locking portion vertically. In the tension mooring line, the upper locking portion is moved by the first locking portion moving means so that the length of the inclined portion when the tension mooring floating body moves in the horizontal direction becomes the same length. Part or the lower locking part To adjust, and the tension mooring floating body formed so as to prevent the tension mooring floating slope when there is a movement in the horizontal direction.

  Here, the site | part which bears the tension | tensile_strength mooring rope's tension | tensile_strength is called a mooring part, and the site | part which suppresses a tension | mooring mooring line relatively moving with respect to a mooring part is called a latching | locking part. It should be noted that here, a case where an additional locking portion is provided separately from the mooring portion and a case where the mooring portion also serves as the locking portion are included.

  Since the tension of the tension mooring line is borne by the mooring part, the locking part only needs to have a function of suppressing the relative movement of the tension mooring line relative to the mooring part in the horizontal direction. Therefore, in order to suppress the horizontal movement of a part of the tension mooring line, for example, like a bell mouth, it is formed with a cylindrical body surrounding the tension mooring line or surrounding the locking part of the tension mooring line. It can be formed of an annular body. For example, the cylindrical body extends downward from the upper mooring portion or upward from the lower mooring portion, and the annular body is fixedly supported by the tension mooring floating body via the frame body.

  According to this configuration, the lower mooring part (anchor such as a template or a pile (pile)) of the bottom of the water (sea bottom, lake bottom, river bottom, etc.) due to an earthquake or the like sinks unequally, When the length of each tension mooring line is not the same by adjusting the length of the tension mooring measure (tendon) to recover horizontally, move the upper locking part or the lower locking part up and down, The slantable length of each tension mooring line is made the same. As a result, when the tension mooring floating body moves (offset) in the horizontal direction by an external force such as wind force or tidal force, each upper mooring part on the tension mooring floating body side sinks evenly. Occurrence of inclination can be prevented. Moreover, since the tension of each tension mooring line when the tension mooring floating body moves in the horizontal direction can be equalized, the occurrence of slack, which is a phenomenon that the tension mooring line loosens, can be suppressed.

  In the above-described tension mooring floating body, the upper locking portion is provided, and the vertical position of the upper locking portion can be moved without changing the vertical position of the upper mooring portion. In the above-described tension mooring floating body, the lower locking portion is provided, and the vertical position of the lower locking portion is moved without changing the vertical position of the lower mooring portion. .

  According to these configurations, since the mooring part adjusts only the length of the mooring line without moving the mooring part up and down, the mooring part does not need a vertical moving means. However, in order to cope with uneven settlement of the bottom of the water, a mooring line feeding device and a length adjusting device are required. However, on the other hand, since the engaging portion where no large tension acts is moved up and down, the structure of the moving means for moving up and down can be made relatively simple to reduce the weight.

  Further, in the above-described tension mooring floating body, the upper mooring portion also serves as the upper locking portion, and is provided with a mooring portion moving means that is also a locking portion moving means for moving the vertical position of the upper mooring portion. .

  According to this configuration, since the mooring part itself that receives the tension of the tension mooring line is moved up and down, the mechanism of the moving means for moving up and down requires strength, but by moving the mooring part itself up and down, Since it corresponds to the unevenness of the water depth of the lower mooring part at the time of installation, or to correspond to the uneven settlement of the bottom of the water after the installation, the tension mooring measure feeding mechanism and the length adjusting device become unnecessary.

  Then, the tension mooring floating body tilt adjustment method for achieving the above object is achieved by connecting the upper mooring portion on the floating body side with the lower mooring portion installed on the water bottom by a plurality of tension mooring lines, and In the tension mooring floating body that holds the position by applying tension to the rope, the upper locking portion that suppresses relative movement of at least a part of the upper side of the tension mooring rope in the horizontal direction with respect to the upper mooring portion, or the tension The tension mooring floating body in the tension mooring line is moved vertically by moving the lower locking portion for suppressing at least a part of the lower side of the mooring line from moving relative to the lower mooring portion in the horizontal direction. The length of the portion that inclines when moved in the horizontal direction is adjusted to be the same length to prevent the tension mooring floating body from inclining when the tension moored floating body moves in the horizontal direction. Is the method

  According to this method, after the tension mooring floating body is installed in a predetermined water area, uneven subsidence of the ground at the bottom of the water occurs, and the template of the lower mooring portion on the bottom of the bottom is inclined or the bottom of the bottom of the bottom is If there is a difference in the amount of settlement of the mooring part piles (pile), adjust the vertical position of the upper locking part or the lower locking part so that the length of each tension mooring line can be inclined Can be adjusted.

  As a result, when the tension mooring floating body moves in the horizontal direction by an external force such as wind force or tidal current, the upper mooring part on the tension mooring floating body side sinks evenly with the same inclination angle of the tension mooring cable. Thus, the tension mooring floating body can be prevented from being inclined.

  Moreover, since the tension of each tension mooring line when the tension mooring floating body moves in the horizontal direction can be made uniform, the occurrence of slack, which is a phenomenon that the tension mooring line loosens, can be suppressed. This slack is likely to occur when there are four or more mooring portions of the tension mooring line.

  In addition, this tilt adjustment method is not only for the case where unequal subsidence occurs on the bottom of the water after installation, but also when the tension mooring measures are set on the It can also be used in the case of adjusting the tension mooring floating body horizontally by being coupled to the lower mooring portion.

  In the tension mooring floating body and the method of adjusting the inclination of the tension mooring floating body, when the tension mooring floating body is equipped with a wind power generator, the projected area on the water surface is relatively large and the horizontal wind load is large. Thus, since the amount of movement (offset amount) in the horizontal direction is increased, the inclination associated with the offset is also increased, and the effect of the present invention is further increased.

  According to the tension mooring floating body and the inclination adjusting method of the tension mooring floating body of the present invention, when the mooring part on the bottom of the water bottom is sunk unevenly due to an earthquake or the like, the upper locking part or the lower locking part is moved up and down. The lengths of the portions of the tension mooring lines that can be inclined when the tension mooring floating body moves in the horizontal direction can be made the same.

  Therefore, when the tension mooring floating body moves in the horizontal direction by external force such as wind force or tidal current force, each upper mooring part on the tension mooring floating body side sinks evenly, so that the tension mooring floating body can be prevented from tilting. . As a result, it is possible to avoid the influence caused by the inclination on the operation and efficiency of the equipment mounted on the tension mooring floating body.

  Therefore, since the allowable range of unequal settlement after installation of the tension mooring floating body can be made larger than that of the prior art, it is possible to prevent unequal settlement applied to the bottom-side template and the pile portion during installation work. The foundation work can be simplified compared to the case of the prior art. Therefore, the number of man-hours and the construction period can be reduced, and the cost for installation can be reduced.

  In addition, since the tension of each tension mooring line when the tension mooring floating body moves in the horizontal direction can be equalized, even in a tension mooring floating body having four or more mooring sections, slack is a phenomenon in which the tension mooring line loosens. And damage to the tension mooring line due to this slack can be avoided.

  Hereinafter, the tension mooring floating body and the inclination adjusting method of the tension mooring floating body according to the present invention will be described with reference to the drawings. Here, in particular, a tension mooring floating body in which a wind power generator is mounted on an upper structure supported by the floating body will be described as an example. However, the present invention is not limited to the wind power generator, and the upper structure includes an oil well drilling device, and the like. The present invention can also be applied to a tension mooring floating body equipped with a plant or a measuring device.

  As shown in FIG. 1, a tension mooring floating body (tension leg platform) 1 according to a first embodiment of the present invention supports an upper structure 11 on which a wind power generator 10 is mounted, and the upper structure 11. Floating body 12 for floating, tension mooring lines 13a-13d called tendons for mooring the floating body 12, and tension mooring lines 13a-13d for fixing to the bottom 2 of the seabed, lake bottom, riverbed The anchor 14 is configured.

  The floating body 12 supports the weight of the upper structure 11 with buoyancy and maintains the upper structure 11 at a preset height above the water surface. In FIG. 1, the floating body 12 is a cylinder or a polygonal column. And a lower floating body 12b formed of four columnar bodies that are connected to the lower portion of the cylindrical body 12a and extend radially in the horizontal direction. The cylindrical body 12a and the lower floating body 12b have a hollow structure so as to generate buoyancy, and are formed of steel, prestressed concrete (PC), or the like.

  The cylindrical body 12a stands upright, and a part of the upper portion thereof protrudes above the water surface 3 to support the upper structure 11. In these floating bodies 12, the upper ends of the tension mooring lines 13a to 13d are fixed to the upper mooring parts 12c at the four corners of the lower floating body 12b. Since the upper mooring portion 12c on the distal end side of the lower floating body 12b is separated from the center of the lower floating body 12b and the center of the cylindrical body 12a, the moment lever relating to the inclination of the upper structure 11 is increased. The tension fluctuation of the tension mooring lines 13a to 13d with respect to the overturning moment acting on the upper structure 11 is reduced.

  These tension mooring lines 13a to 13d are formed of steel chains, cables, fiber ropes, and the like, and are always in tension (tension), and their lower ends are the lower mooring parts of the template 14. 14c is moored and installed. This tension pulls the floating body 12 into the water against the buoyancy of the floating body 12.

  The template 14 is a weight formed of concrete or the like, and is used as a gravity-type anchor that is submerged in the water bottom 2 and fixed by its own weight. In addition, you may use the pile (pile) fixed to the ground of the bottom 2 as an anchor. This template 14 is for mooring the floating body 12 in the preset position via the lower mooring part 14c, the tension mooring lines 13a-13d, and the upper mooring part 12c, and the lower ends of the tension mooring lines 13a-13d. The part is fixed to the lower mooring part 14 c of the template 14.

  The size of the tension mooring floating body 1 is, for example, when the power generation amount is assumed to be 2 MW, and the windmill 10a has a rotating diameter of about 80 m when installed at a water depth of about 100 m to 200 m on the continental shelf. The rotating shaft 10b of the windmill 10a is about 75m above the water surface 3, the diameter of the cylindrical body 12a of the floating body 12 is about 7m, the height is about 40m, and the diameter of the circle passing through the lower mooring portion 12c is 60m. Degree.

  The tension mooring floating body 1 is installed by injecting ballast water into the ballast tank of the floating body 12 or by loading the ballast so that the floating body 12 is sunk with a lower buoyancy than when the floating body 12 is in the installed state. Then, it moves on the template 14 previously installed in the set water area, suspending with the offshore crane as needed. After the movement, the upper ends of the tension mooring lines 13a to 13d are coupled to the upper mooring portion 12c of the lower floating body 12b of the floating body 12 and the lower end is lowered to the lower mooring portion 14c of the template 14 while being suspended by an offshore crane to prevent falling. To join.

  After the coupling, the suspension by the offshore crane is released, and the buoyancy of the floating body 12 is preliminarily determined by discharging the ballast water or removing the ballast while paying attention to the inclination of the upper structure 11 and the floating body 12 that supports the upper structure 11. With the set buoyancy, the inclination of the upper structure 11 and the tension of the tension mooring lines 13a to 13d are adjusted by changing the length of the tension mooring lines 13a to 13d.

  In this installation, the tension mooring floating body 1 is moored by applying a preset initial tension to the tension mooring lines 13a to 13d so as not to rotate up and down, roll, and so on in the waves. Although this initial tension is a difference between buoyancy and weight, the buoyancy of the floating body 12 and the length of the tension mooring lines 13a to 13d are set so that the tensions T1 to T4 of the tension mooring lines 13a to 13d become preset tensions. Adjust and set. Further, the initial tension is set so that the movable range in the horizontal direction also falls within the allowable range.

  And in 1st Embodiment, in order to adjust the inclinable length of the tension mooring lines 13a-13d after installation of the tension mooring floating body 1, as shown in FIG. 1, the floating bodies of the tension mooring lines 13a-13d A cylindrical locking member 16 is provided on the upper mooring portion 12c on the 12 side. The locking member 16 is disposed so as to surround the upper locking portion 15 of the tension mooring lines 13a to 13d.

  The locking member 16 prevents the upper portions (indicated by dotted lines) of the tension mooring lines 13a to 13d from moving relative to the upper mooring portion 12c in the horizontal direction. In other words, when the tension mooring floating body 1 moves in the horizontal direction, the tension mooring lines 13a to 13d are inclined with the upper locking portion 15 which is the lower end of the locking member 16 as the starting point of the inclination. In this case, the movement of a horizontal direction is suppressed with respect to the part from the upper side latching | locking part 15 of the tension | tensile_strength mooring lines 13a-13d to the upper side mooring part 12c by the part of the cylindrical latching member 16.

  Below the locking member 16, the tension mooring lines 13a to 13d may be completely fixed and supported. However, the tension mooring lines 13a to 13d are spread in a trumpet shape so as not to be damaged, and as a whole, a bell mouth shape is formed. Preferably, it is formed and gently supported.

  As shown in FIG. 2, a locking part moving means 17 for moving the locking member 16 in the vertical direction is provided. The locking part moving means 17 can be configured by the following mechanism. By these mechanisms, the lengths of the tiltable portions of the tension mooring lines 13a to 13d can be adjusted to the same length Lf.

  One of them is a locking part moving means of a ball nut type mechanism. In this case, a holding member 17 that holds the locking member 16 is provided around the anchoring portion 12c on the distal end side of the lower floating body 12b, and a female screw portion is provided on the holding member 17. By screwing a male screw portion provided on a part of the locking member 16 to the female screw portion and rotating the locking member 16 or the holding member 17, the male screw portion is moved up and down within the female screw portion. The locking member 16 is moved up and down.

  Another mechanism is a cylinder-piston mechanism. In this case, the locking member 16 is composed of a piston inserted in a cylinder provided around the mooring portion 12c and is moved up and down. Yet another mechanism is a rack and pinion mechanism. In this case, the rack provided on the locking member 16 is moved up and down by the pinion gear provided on the holding member 17 around the mooring portion 12 c, and the locking member 16 is moved up and down in the holding member 17. It may be moved up and down by jacking up with a jack and spacer mechanism and changing the amount (thickness) of the spacer.

  Moreover, as this latching | locking part 15 and the latching member 16, the latching | locking part 15 is formed with the annular member which encloses each of tension | tensile_strength mooring lines 13a-13d, and this annular member is the locking member 16 of frame structure. The locking member 16 may be formed and supported so as to be vertically movable by a holding member 17 provided on the lower floating body 12b. In this case, a part of the tension mooring lines 13a to 13d is prevented from moving in the horizontal direction by the portion of the annular member 15. This frame-structured locking member is lighter than a cylindrical locking member and is less susceptible to tidal currents.

  Next, the effect of making the lengths of the inclinable portions of the tension mooring lines 13a to 13d the same length Lf will be described. Here, in order to simplify the description, the case where the tension mooring lines are two diagonal lines 13a and 13c as shown in FIGS. 2 and 3 will be described.

  In the case of two tension mooring lines 13a and 13c as shown in FIG. 2, it is assumed that the lower mooring part 14c on the tension mooring line 13c side sinks deeper than the lower mooring part 14c on the tension mooring line 13a side. In this case, in order to keep the floating body 12 horizontal, the length Lc of the tension mooring line 13c is made longer than the length La of the tension mooring line 13a.

  In the first embodiment, as shown in FIGS. 2 and 3, the locking member 16 is moved up and down and provided at the lower end of the locking member 16 without changing the position of the upper mooring portion 12 c. The upper locking portion 15 is moved in the vertical direction so that the tensionable mooring line 13a and the tensioning mooring line 13c can be tilted to the same length Lf.

  Thereby, as shown in FIG. 3, when the floating body 12 moves (offset) in the horizontal direction by an external force such as wind force or tidal force, the upper mooring portions 12c on the floating body 12 side sink evenly. . That is, since a parallelogram having four points of the upper locking portions 15 and 15 and the lower anchoring portions 14c and 14c as vertices is formed, when the floating body 12 moves in the horizontal direction, the upper locking portions 15 and 15 The one side connecting 15 and the one side connecting the lower mooring portions 14c, 14c are kept parallel.

  With this configuration, it is possible to prevent the floating body 12 from being inclined. Moreover, since tension | tensile_strength mooring lines 13a and 13c at the time of the floating body 12 moving to a horizontal direction can be equalized, generation | occurrence | production of the slack which is a phenomenon which tension | tensile mooring lines 13a and 13c loosen can be suppressed.

  According to this configuration, the upper mooring portion 12c does not move up and down, and the upper mooring portion 12c only adjusts the lengths La to Ld of the tension mooring lines 13a to 13d. Is no longer necessary. However, in order to cope with uneven settlement of the bottom 2, a feeding device or a length adjusting device for the tension mooring lines 13 a to 13 d is required. However, on the other hand, since the upper locking portion 15 to which no tension acts is moved up and down, the configuration of the vertical moving means 16 and 17 can be formed with a relatively simple configuration, and the weight can be reduced.

  Next, a second embodiment will be described. As shown in FIGS. 4 and 5, in the tension mooring floating body 1A of the second embodiment, the locking member 16A and the lower locking portion 15A are not the floating body 12 side, but the lower anchoring portion 14c of the template 14. Provide on the side. The structure other than this is the same as the structure of the tension mooring floating body 1 of the first embodiment.

  The locking member 16A is for adjusting the vertical position of the lower locking portion 15A of the tension mooring lines 13a to 13d after the tension mooring floating body 1A is installed. Since it is difficult to provide a mechanism for moving the locking portion 15A up and down, a ring-shaped spacer (cylindrical) is configured to sink along the tension mooring lines 13a to 13d.

  Then, the length (thickness) of the locking member 16 is adjusted according to the thickness and the number of ring-shaped spacers to be sunk. The upper end of the locking member 16 becomes the lower locking portion 15A. The upper portion of the locking member 16 may be the end of a cylinder, but it is spread in a trumpet shape so as not to damage the tension mooring lines 13a to 13d, and is formed into a bell mouth shape as a whole and gently supported. Is preferred. This bell mouth shape also has the advantage that the spacer (cylinder) can be easily stacked when it is lowered along the tension mooring lines 13a to 13d.

  Next, the effect of making the length of the inclinable portions of the tension mooring lines 13a to 13d in this case the same length Lf will be described. Here, in order to simplify the description, the case where the tension mooring lines are two diagonal lines 13a and 13c as shown in FIGS. 4 and 5 will be described.

  In the case of two tension mooring lines 13a and 13c as shown in FIG. 4, it is assumed that the lower mooring part 14c on the tension mooring line 13c side sinks deeper than the lower mooring part 14c on the tension mooring line 13a side. In this case, in order to keep the floating body 12 horizontal, the length Lc of the tension mooring line 13c is made longer than the length La of the tension mooring line 13a.

  In the second embodiment, as shown in FIGS. 4 and 5, the ring-like shape of the locking member 16A for sinking is not changed without changing the position of the upper mooring portion 12c and the position of the lower mooring portion 14c. By changing the number of spacers, the length of the locking member 16A is adjusted, and the lower locking portion 15A provided at the upper end of the locking member 16A is moved upward so that the tension mooring line 13a and the tension The length by which the mooring line 13c can be tilted is set to the same length Lf.

  Accordingly, as shown in FIG. 5, when the floating body 12 moves (offsets) in the horizontal direction by an external force such as wind force or tidal force, each upper mooring portion 12 c on the floating body 12 side sinks evenly. . That is, a parallelogram having four points of the lower locking portions 15A and 15A and the upper mooring portions 12c and 12c is formed, and the lower locking portions 15A and 15A are moved when the floating body 12 moves in the horizontal direction. And one side connecting the upper mooring portions 12c, 12c are kept parallel.

  With this configuration, it is possible to prevent the floating body 12 from being inclined. Moreover, since tension | tensile_strength mooring lines 13a and 13c at the time of the floating body 12 moving to a horizontal direction can be equalized, generation | occurrence | production of the slack which is a phenomenon which tension | tensile mooring lines 13a and 13c loosen can be suppressed.

  According to this configuration, the upper mooring portion 12c and the lower mooring portion 14c are not moved up and down, and the upper mooring portion 12c adjusts only the lengths La to Ld of the tension mooring lines 13a to 13d. No vertical movement means is required for the lower mooring portion 14c. However, in order to cope with uneven settlement of the bottom 2, a feeding device or a length adjusting device for the tension mooring lines 13 a to 13 d is required. However, on the other hand, since the lower locking portion 15A is moved up and down by the ring-shaped spacer, the lower locking portion 15A can be moved up and down with a very simple configuration.

  Next, a third embodiment will be described. As shown in FIGS. 6 and 7, in the tension mooring floating body 1 </ b> B of the third embodiment, instead of adjusting the vertical position of the upper locking portion 15, the upper locking portion 12 c also serves as the upper locking portion. The upper mooring portion 12c is configured to be movable in the vertical direction. The configuration other than this is the same as the configuration of the tension mooring floating body 1 according to the first embodiment.

  In the third embodiment, the upper mooring portion 12c is configured to be movable in the vertical direction. However, the mooring portion moving means 18 and 19 can be configured by the following mechanism. With these mechanisms, the length of the inclinable portions of the tension mooring lines 13a to 13d can be maintained at the same length Lf (= La = Lc).

  One of them is a means for moving the mooring portion (also serving as a locking portion) of the jack and spacer mechanism as shown in FIG. 13. On the holding member 19 side, a stopper 19c is jacked up by a hydraulic cylinder 19a and a rod 19b. By changing the quantity (thickness) of the spacer 19d formed of a split disk, the jack 19 is stopped and the stopper 19c is lowered as shown in FIG. 14, thereby lowering the lower end 12ba of the lower floating body (pontoon) 12b. And change the distance. Thereby, the mooring member 18 provided with the upper mooring part 12c is moved up and down.

  In addition, a ball nut type mechanism can be used. In this case, a male screw part is provided in a part of an anchoring member (locking member) 18 having an upper anchoring part 12c that also serves as an upper locking part at the lower end, and this male screw part is connected to the distal end side of the lower floating body 12b. The male screw part is moved up and down in the female screw part by rotating the anchoring member 18 or the holding member 19 by screwing into the female screw part provided in the holding member 19 holding the mooring member 18 provided in The mooring portion 12c is moved up and down.

  Another mechanism is a cylinder-piston mechanism. In this case, the mooring member 18 is composed of a piston inserted in a cylinder provided in the holding member 19 and is moved up and down. Yet another mechanism is a rack and pinion mechanism. In this case, the rack provided on the mooring member 18 is moved up and down by the pinion gear provided on the holding member 19, and the mooring member 18 is moved up and down within the holding member 19.

  Next, the effect of making the lengths of the inclinable portions of the tension mooring lines 13a to 13d the same length Lf will be described. Here, in order to simplify the description, a case where the tension mooring lines are two diagonal lines 13a and 13c as shown in FIGS. 6 and 7 will be described.

  In the case of two tension mooring lines 13a and 13c as shown in FIG. 6, it is assumed that the lower mooring part 14c on the tension mooring line 13c side sinks deeper than the lower mooring part 14c on the tension mooring line 13a side. In this case, in order to keep the floating body 12 horizontal, the length Lc (= Lf) of the tension mooring line 13c and the length La (= Lf) of the tension mooring line 13a are left as they are, and the vertical direction of the mooring part 12c. To maintain the level of the floating body 12. That is, the upper mooring portion 12c provided at the lower end of the mooring member 18 is moved in the vertical direction to maintain the same length Lf so that the tension mooring line 13a and the tension mooring line 13c can be tilted.

  As a result, as shown in FIG. 7, when the floating body 12 moves (offsets) in the horizontal direction by an external force such as wind power or tidal force, the upper mooring portions 12c on the floating body 12 side sink evenly. . That is, a parallelogram having four points of the upper mooring portions 12c, 12c and the lower mooring portions 14c, 14c is formed, and one side connecting the upper mooring portions 12c, 12c when the floating body 12 moves in the horizontal direction. And one side connecting the lower mooring portions 14c, 14c are kept parallel.

  With this configuration, it is possible to prevent the floating body 12 from being inclined. Moreover, since tension | tensile_strength mooring lines 13a and 13c at the time of the floating body 12 moving to a horizontal direction can be equalized, generation | occurrence | production of the slack which is a phenomenon which tension | tensile mooring lines 13a and 13c loosen can be suppressed.

  According to this structure, since the upper mooring part 12c which receives the tension | tensile_strength mooring lines 13a-13d moves up and down, strength is required for the mechanism of the mooring part moving means 18 and 19, but upper mooring part 12c itself is attached. By moving up and down, it is possible to cope with uneven settlement of the bottom 2, so that the tension mooring measures 13 a to 13 d and the length adjusting device are not necessary.

  According to the tension mooring floating bodies 1, 1 </ b> A, 1 </ b> B and the tension mooring floating body inclination adjusting method of the first to third embodiments, the upper structure 11 serving as a pedestal supported by the tension mooring floating body 12 is used. In the tension mooring floating bodies 1, 1A, 1B provided with facilities such as wind power generators, after the tension mooring floating bodies 1, 1A, 1B are installed in a predetermined water area, the ground of the bottom of the water bottom 2 is unevenly subsidized. If the template 14 of the lower mooring part 14c on the second side is inclined and the wind power generator 10 of the tension mooring floats 1, 1A, 1B may be inclined, the upper locking part 15 or the lower locking part By adjusting the vertical position of the upper mooring part 12c which also serves as the part 15A or the upper locking part, the slantable lengths of the tension mooring lines 13a to 13d can be adjusted to be equal to the same length Lf.

  Thereby, when the tension mooring floating bodies 1, 1 </ b> A, 1 </ b> B move (offset) in the horizontal direction by an external force such as wind force or tidal current, the tension mooring lines 13 a to 13 d have the same inclination angle, and the tension mooring floating body 1 Since each upper mooring part 12c on the 1A, 1B side sinks evenly, it is possible to prevent the tension mooring floating bodies 1, 1A, 1B from being inclined.

  Further, since the tensions T1 to T4 of the tension mooring lines 13a to 13d when the tension mooring floating bodies 1, 1A and 1B move in the horizontal direction can be made substantially equal, slack of the slack which is a phenomenon that the tension mooring lines 13a to 13d loosen Generation can be suppressed. In addition, this slack becomes easy to generate | occur | produce when the mooring parts 12c (or 14c) of the tension mooring lines 13a-13d become four or more places.

  In addition, this inclination adjustment method is not limited to the case where unequal settlement occurs on the bottom 2 after the tension mooring floats 1, 1A, 1B are installed in a predetermined water area, but also the tension mooring floats 1, 1A, 1B are When installing in the water area, the tension mooring floating bodies 1, 1 </ b> A, 1 </ b> B can also be used to hold the position in a state where the lower mooring part 14 c on the bottom 2 side cannot be formed completely horizontally.

  Further, in the above-described tension mooring floats 1, 1A, 1B and the tension mooring float tilt adjustment method, when the tension mooring floats 1, 1A, 1B are equipped with the wind power generator 10, the projected area on the water surface is relatively In particular, since the wind load in the horizontal direction increases and the amount of movement (offset amount) in the horizontal direction increases, the inclination associated with the offset also increases, so the effect of the present invention is further increased.

  In the above description, the shape of the floating body 12 is formed from the cylindrical body 12a serving as the center column and the lower floating body 12b that is the legs (pontoons) extending radially in four directions from the lower side. However, the number of lower floating bodies, the number of tension mooring lines, and the shape of the floating body 12 are not limited thereto. Moreover, although the example of the template was given as an anchor, you may use the pile (pile) fixed to the ground of the bottom 2 as an anchor.

It is a figure showing composition of a tension mooring floating body in a 1st embodiment of the present invention. It is a figure which shows the state of the tension mooring line in 1st Embodiment. It is a figure for demonstrating the relationship between the movement to the horizontal direction of the tension | tensile_strength floating body in the 1st Embodiment, and the inclination of a tension | tensile_strength floating body. It is a figure which shows the state of the tension mooring line in 2nd Embodiment. It is a figure for demonstrating the relationship between the movement to the horizontal direction of the tension | tensile_strength floating body in the 2nd Embodiment, and the inclination of a tension | tensile_strength floating body. It is a figure which shows the state of the tension mooring line in 3rd Embodiment. It is a figure for demonstrating the relationship between the movement to the horizontal direction of the tension | tensile_strength mooring floating body in 3rd Embodiment, and the inclination of a tension | tenon mooring floating body. It is a figure which shows the structure of the tension mooring floating body of a prior art. It is a figure which shows the state of the tension mooring rope in a prior art. It is a figure which shows the state of the tension | tensile_strength floating body when the uneven settlement of the lower mooring part in a prior art arises. It is a figure which shows the state which restored | restored the inclination of the tension | tensile_strength mooring body after the uneven settlement of the lower side mooring part in a prior art occurred. It is a figure for demonstrating the relationship between the movement to the horizontal direction of a tension | tensile_strength floating body, and the inclination of a tension | tensile_strength floating body in the state of FIG. It is a figure which illustrates one of the mooring part (cum latching part) moving means for moving an upper mooring part up and down, and is a figure which shows the inside of a set. It is a figure which shows after being set by the mooring part (cum locking part) moving means of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1X Tension mooring floating body 2 Water bottom 3 Water surface 10 Wind power generator 11 Upper structure 12 Floating body 12a Tubular body 12b Lower floating body 12c Upper mooring part 13a-13d Tension mooring cable 14 Anchor 14c Lower mooring part 15 Upper side Locking portion 15A Lower locking portion 16 Locking member 17 Holding member 18 Mooring member 19 Holding member L1 Length of tension mooring line at installation La to Ld Length of tension mooring line Lf Inclinable portion of tension mooring line Length T1-T4 Tension of tension mooring line

Claims (5)

In the tension mooring floating body that holds the position by applying tension to the tension mooring line by connecting the upper mooring part on the floating body side and the lower mooring part installed on the bottom of the water with a plurality of tension mooring lines,
An upper locking portion that suppresses relative movement of at least a portion of the upper side of the tension mooring line in the horizontal direction with respect to the upper mooring portion, or at least a portion of the lower side of the tension mooring line with respect to the lower mooring portion. A lower locking portion that suppresses relative movement in the horizontal direction and a locking portion moving means for moving the upper locking portion or the lower locking portion in the vertical direction. In the rope, the upper locking portion or the lower locking portion is moved by the previous locking portion moving means so that the length of the inclined portion when the tension mooring floating body moves in the horizontal direction becomes the same length. A tension mooring floating body that is adjusted by moving in the vertical direction so as to prevent inclination of the tension mooring floating body when the tension mooring floating body moves in the horizontal direction.   2. The tension mooring according to claim 1, wherein the upper locking portion is provided, and the vertical position of the upper locking portion is movable without changing the vertical position of the upper mooring portion. Floating body.   The lower side locking portion is provided, and the vertical position of the lower side locking portion is moved without changing the vertical position of the lower side anchoring portion. Or the tension mooring floating body of 2.   The upper mooring portion also serves as the upper locking portion, and is provided with a mooring portion moving means that is also a locking portion moving means for moving the vertical position of the upper mooring portion. Tension mooring float described. In the tension mooring floating body that holds the position by applying tension to the tension mooring line by connecting the upper mooring part on the floating body side and the lower mooring part installed on the bottom of the water with a plurality of tension mooring lines,
An upper locking portion that suppresses relative movement of at least a portion of the upper side of the tension mooring line in the horizontal direction with respect to the upper mooring portion, or at least a portion of the lower side of the tension mooring line with respect to the lower mooring portion. By moving the lower locking portion that suppresses relative movement in the horizontal direction in the vertical direction, the length of the portion of the tension mooring line that inclines when the tension mooring floating body moves in the horizontal direction is A tension mooring floating body inclination adjusting method, wherein the tension mooring floating body is adjusted to have the same length to prevent the tension mooring floating body from tilting when the tension mooring floating body moves in a horizontal direction.

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