JP2011207446A - Assistant floating body, method of towing floating body using the same, and method of installing floating body using the same - Google Patents

Abstract

[PROBLEMS] To increase the restoring force of a floating body of a tension mooring floating body system, and to provide a supporting floating body and a supporting floating body that can sufficiently support when the floating body is towed, installed, maintained, inspected, or removed. Provided are a floating body towing method and a floating body installation method using a support floating body.
A floating body 12 for supporting an upper structure, a plurality of tension mooring lines 13 and a fixing bottom member 14 are provided, and the floating body 12 includes a central columnar body 12a, a submerged buoyancy body 12b, and a water surface. A support floating body 20 for supporting towing work, installation work, maintenance inspection work, removal work, etc. of the floating body 12 in the tension mooring floating body system configured to include the upper connecting body 12c and the water surface mooring portion 12d. It has a buoyancy greater than its own weight and a restoring force against inclination from the vertical direction, and is temporarily engaged with a part of the floating body 12 and separated after the work.
[Selection] Figure 8

Description

  The present invention provides a support for supporting at least one of a towing operation, an installation operation, a maintenance inspection operation, and a removal operation of a floating body of a tension mooring floating body system in which a tension mooring floating body used as a pedestal of a wind power generator is tensioned. The present invention relates to a floating body, a floating body towing method using a support floating body, and a floating body installation method using a support floating body.

  Regarding wind power generation, a proposal has been made to install a tension mooring floating body (TLP: tension leg platform) in a relatively deep water area on the coastal continental shelf, and to mount a device such as a wind power generator on the tension mooring floating body. I'm starting. For example, as shown in FIG. 36, the floating body 12 on which the pedestal 11 of this wind turbine generator is mounted has one or more (four in FIG. 36) tension mooring lines 13 called tendons attached to the floating body 12. And anchored to a fixing subsidence member 14 such as an anchor provided on the bottom 2 of the seabed, lake, river, or the like.

  In general, the tension mooring floating body 1X as shown in FIG. 36 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, thereby drafting the floating body 12. In a state where it is deepened and submerged than in the installation state, it moves onto the fixed bottom member 14 installed in the preset water area in advance. After the movement, the upper end of the tension mooring line 13 is joined to the upper mooring part 15 c of the floating body 12, and the lower end of the tension mooring line 13 is joined to the lower mooring part 14 c of the fixing bottom member 14.

  After joining, 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 floating body 12 on which the upper structure 11 is mounted. Furthermore, the length of the tension mooring lines 13 is changed to adjust the inclination of the upper structure 11 and the magnitudes of the tensions T1 to T4 of the tension mooring lines 13. In this installation, the tension mooring line 13 is set in advance so that the tension mooring floating body 1X does not shake up and down, laterally tilt, and vertically tilt in the waves, and the movable range within the horizontal direction falls within the allowable range. The applied initial tensions T1 to T4 are applied and moored (see, for example, Patent Documents 1 and 2).

  Further, in the case of mounting a wind power generator that does not require a large area for mounting the superstructure, a columnar body (center column) 12a that penetrates the water surface as shown in FIG. 37, and this columnar body An upper end side of a plurality of tension mooring lines 13 is fixed to a floating body 12 having a submerged buoyancy body (pontoon) 12b connected to the lower part of 12a, and a lower end side of the tension mooring lines 13 is fixed to the bottom 2 It has been proposed that the tension mooring cable 13 is connected to the lower anchoring portion 14c of the bottom sinking member 14 and tension is applied to the tension mooring cable 13 to hold the tension mooring floating body 1Y in position (see, for example, Patent Documents 3 and 4). .

  In a tension mooring floating body 1Y called a “mini tension leg platform (mini TLP)” composed of a floating body 12 having a columnar body 12a penetrating the water surface and a submerged buoyant body 12b connected to the columnar body 12a, The tension mooring line 13 is moored to the upper mooring part 15c of the submerged buoyancy body 12b at the water depth D. Since the tension mooring floating body 1Y has only the columnar body 12a penetrating the water surface after installation, the influence on the tension of the tension mooring line 13 due to fluctuations in the tide level and up and down of the water surface due to waves is reduced.

  However, in the tension mooring floating body 1X as shown in FIG. 36, there are submerged portions such as a lower portion 12b of the floating body 12 for fixing the upper end of the tension mooring line 13 and a columnar body (column) 12a for supporting the base 11. Very big. Moreover, in the tension mooring floating body 1Y as shown in FIG. 37, the submerged portions such as the submerged buoyancy body 12b and the columnar body 12a below the floating body 12 for fixing the upper end of the tension mooring line 13 are very large. For this reason, the submerged area is large and spreads over a wide range, so the water-resistant paint surface in this submerged area becomes wider, and the amount of paint work and paint increases, and the secular change after tension mooring As a result, there is a problem that the maintenance area becomes large and the amount of work for maintenance management increases. Moreover, since the submerged area is large, there is a high possibility that the weight of the steel material will increase.

  In the “mini TLP” of the prior art, since the upper mooring portion 15c of the tension mooring line 13 is in the water, the work for attaching the tension mooring line 13, the tension adjustment work, the maintenance check work, and the like are work in the water. For this reason, the workability is poor and the work time is long, so the cost for these work increases. In addition, when the lower mooring part sinks unequally due to an earthquake or the like after installation, it is necessary to adjust the length of the tension mooring line 13 with respect to this unequal subsidence. Since it is submerged, there is a problem that it is necessary to work underwater.

  In order to solve this problem, a floating body for supporting the superstructure, a plurality of tension mooring lines for mooring the floating body, and a fixing subsidence member for fixing the tension mooring lines to the bottom of the water In the tension mooring floating body system configured with the central columnar body for supporting the upper structure above the water surface, the submerged buoyancy body provided below the central columnar body, and the central columnar body A water surface coupling body arranged radially extending from the body in the circumferential direction, and a water surface mooring section which is disposed at the end of the water surface coupling body and to which the upper end of the tension mooring line is fixed It is considered to be.

  This tension mooring floating body system is configured such that all or more than half of the surface area of the above-water-connected body is above the water surface during still water, and the water-side mooring portion is above the water surface during still water.

  According to this tension moored floating body system, the submerged buoyant body can be simply used as a buoyant body for generating buoyancy without considering the restoring force, and the submerged area can be reduced. In addition, the submerged part can be made very much by arranging the mooring part on the water surface and all or part of the water surface connecting body that connects the water surface mooring part and the central columnar body on the water surface. Can be small.

  Thereby, the surface which coats the special paint which has water resistance and corrosion resistance in this submerged part can be made small, and the quantity of special paint and the amount of painting work can be reduced. Moreover, since the area which requires underwater work becomes narrow, the work amount for maintenance management after tension mooring decreases.

  In addition, when the water mooring part is configured to be above the water surface so as not to be submerged in static water, the upper mooring part that fixes the upper end of the tension mooring line can be maintained on the water surface. Rope attachment work, tension adjustment work, maintenance inspection work, and the like can be carried out in the air so that workability is good and work time can be shortened instead of underwater work, and work costs can be reduced. Also, when adjusting the length of the tension mooring line when the lower mooring section sinks unequal due to an earthquake etc. after installation of the floating body, it is not necessary to work underwater and can be adjusted efficiently. it can.

  In addition, for example, the submerged buoyant body can be easily formed into a shape that is hardly affected by waves by forming the upper part in a truncated cone shape, the intermediate part in a cylindrical shape, and the lower part in an inverted truncated cone shape.

  However, in this tension mooring floating body system, when the tension mooring line is not attached when the floating body is towed or installed, the portion penetrating the water surface is only the central columnar body, so the floating body against the inclination from the vertical direction There is a problem that the static restoring force is remarkably small and the stability performance of the tension mooring floating body is very bad. Therefore, the use of an offshore crane is indispensable to maintain the posture of the tension mooring floating body during towing and installation.

  In this case, even a “mini-TLP” equipped with a wind power generator has a large power generation capacity and can exceed 1000 tons in weight, so the crane to be used must be a large offshore crane. This large offshore crane has a small number of ships in the market and is necessary from the time of towing until the completion of installation, so that the period of use of the large offshore crane becomes long. Therefore, it is difficult to adjust the schedule of towing and installation work, and there is a problem that costs increase.

Japanese Patent Laid-Open No. 1-145292 Japanese Patent Laid-Open No. 4-197887 Japanese Utility Model Publication No. 64-2692 JP 2005-69025 A

  The present invention has been made in view of the above situation, and its purpose is to increase the restoring force against the vertical inclination of the floating body of the tension mooring floating system, and tow work, installation work, maintenance inspection of this floating body. When performing at least one of work and removal work, a support floating body that can sufficiently support these work, a floating tow method using the support floating body, and a floating body installation method using the support floating body It is to provide.

  The support floating body for achieving the above object includes a floating body for supporting the superstructure, a plurality of tension mooring lines for mooring the floating body, and a structure for fixing the tension mooring lines to the bottom of the water. A fixed bottom member, and the floating body is supported by a central columnar body for supporting the upper structure above the water surface, a submerged buoyant body provided below the central columnar body, There is an on-water connector that extends radially from the central columnar body in the circumferential direction, and an on-water mooring portion that is disposed at the end of the above-mentioned connector on the water surface and to which the upper end of the tension mooring line is fixed. In the tension mooring floating body system configured as described above, a floating body for supporting at least one of the towing work, the installation work, the maintenance inspection work, and the removal work of the floating body, which has a buoyancy greater than its own weight and a vertical direction Have the ability to restore Together with the engaged floating the temporarily engaging at least one of the structures of the central pillar and the submerged buoyancy body, configured to be separated after the work.

  According to this configuration, since the support floating body has a buoyancy greater than its own weight, the support floating body can be part of the buoyancy that floats the floating body and the fixed bottom member during towing. It becomes easier to perform the work when removing. In addition, it is possible to easily provide the restoring force against the inclination from the vertical direction by increasing the area of the water surface penetrating portion of the support floating body to some extent and causing the buoyancy change due to the fluctuation of the water level. This water surface penetrating portion has a greater contribution to the restoring force that suppresses the inclination of the floating body when it is far from the center of the central columnar body. Further, it is preferable that the support floating body is provided with a ballast tank so that the buoyancy can be adjusted in order to have a role of adjusting the buoyancy during operations such as towing and installation.

  According to the support floating body, the floating body is temporarily engaged with at least one of the central columnar body and the submerged buoyancy body. With the support floating body having the buoyancy and the restoring force exceeding the dead weight, the inclination of the floating body can be suppressed and the restoring force can be secured, so that the posture of the floating body can be stabilized. In other words, the heel (lateral inclination) and trim (vertical inclination) of the floating body can be suppressed by the support floating body.

  Therefore, this support floating body can remarkably increase the restoring force with respect to the inclination from the vertical direction (in other words, the inclination with respect to the water surface), so that the posture of the floating body can be stabilized in operations such as towing and installation of the floating body, Can prevent falls. As a result, operations such as towing and installation of the floating body can be sufficiently supported, and support by a large offshore crane can be eliminated.

  In addition, since the support floating body is removed from the floating body after the tension mooring, the support floating body can be repeatedly used when a large number of floating bodies of the tension mooring floating body system are installed. As a result, it is possible to reduce the cost of operations such as towing, installation, maintenance inspection, and removal of one floating body.

  In the above-described support floating body, when it is configured to engage with the structure body so that it can move in the vertical direction at least during installation work, that is, it is completely fixed to the structure body. Without disengaging work in deep underwater work when removing the support floating body after installing the floating body, it is possible to slide up and down along this structure and float near the water surface. It can be lost. Therefore, in the work on the surface of the water, the posture of the support floating body is adjusted, the disassembly work accompanying the separation of the support floating body after the installation of the floating body, and the installation of the support floating body for moving the once installed floating body again The reassembly work at the time can be easily performed.

  In the above-described support floating body, it can be divided into two or more, and when it is configured to be integrated when temporarily engaged with the structure and to be divided when released from engagement, In this case, the support floating body can be easily engaged and disengaged.

  In the support floating body described above, when the floating body is configured to be separable into a size that can be pulled out from between the tension mooring lines whose upper ends are fixed to the water surface mooring portion, It becomes possible to perform the engagement operation and the disengagement operation of the floating body in a state where the tension mooring is performed. That is, at the time of releasing the engagement, a part of the support floating body that is disassembled and separated from the structure can be pulled out to the outside from between the mooring portion on the water surface and the tension mooring line so that it can be relatively easily performed. Become. On the other hand, at the time of engagement, a part of the disassembled support floating body can be brought close to the structure from the outside through the surface mooring portion and the tension mooring line.

  The support floating body includes a recess into which the structure enters, and is engaged with the structure when supporting the work, and separated from the structure after the support of the work is completed. With this configuration, the disassembly work and the integration work of the support floating body itself become unnecessary, so that the engagement work and the disengagement work can be easily performed even when a sea condition with relatively severe wave conditions is expected. To be able to do that.

  According to this configuration, since the support floating body is configured with the recess into which the structure enters, the support floating body has many portions along the structure, and the support floating body is difficult to come off from the structure. At the same time, the inclination of the structure can be easily suppressed, and as a result, the restoring force of the floating body can be increased more efficiently.

  In the above support floating body, the floating ballast adjusting system, the power supply system for the floating body, the winding system of the tension mooring line for tensioning the floating body, and the temporary mooring for temporarily mooring the support floating body System, a support ballast adjusting system for the support floating body, a power support system for the support floating body, or a work support system composed of some combination, Since it is not necessary to install an auxiliary device such as a power supply source used only at the time of installation, the overall cost of the tension mooring floating system can be reduced.

  In addition, it will be able to supply power to temporary mooring winches, tension mooring rope (Tendon) take-up drums, ballast pumps mounted on floating bodies, etc., and function as a workbench when installing floating bodies. Can do. Thereby, the support of a work ship etc. at the time of installation can be reduced or made unnecessary.

  That is, by providing the supporting floating body with a part or all of the incidental facilities used on the floating body side only during operations such as towing, installation, maintenance and inspection, it is possible to sufficiently support these operations. As a result, some or all of the incidental facilities of the floating body can be omitted, and the overall cost of the tension mooring floating body system can be reduced.

  A floating body towing method using a support floating body for achieving the above object is a method for towing the floating body in a state where the support floating body is engaged with the floating body. According to this method, since the floating body is formed with a semi-submersible floating body structure or the like, the state before installation is inherently unstable with respect to the inclination with respect to the water surface. By surrounding the floating structure with the supporting floating body, the restoring force can be increased and stabilized as a whole, and the floating body can be prevented from falling during towing.

  In other words, according to this tow method, when the floating body is towed, the support floating body is towed in a state of being temporarily engaged with the floating body, so that the inclination of the floating body can be suppressed by this support floating body, and the restoring force can be secured. The posture of the floating body can be stabilized. As a result, when the floating body is towed, the posture of the floating body can be stabilized and the fall can be prevented, so that support by a large offshore crane can be made unnecessary. Thereby, the towing operation | work of a floating body can fully be supported.

  A floating body installation method using a support floating body for achieving the above object is a method of using the above support floating body in the installation of the floating body of the tension mooring floating body system. According to this method, by engaging the support floating body, the support floating body surrounds at least one of the central columnar body of the floating body or the submerged buoyancy body, so that the restoring force is increased and stabilized as a whole. Can be prevented from falling over when the floating body is installed. As a result, it is possible to eliminate the need for support of an offshore large crane ship or the like at least in the installation sea area.

  According to this installation method, the installation work is performed while temporarily engaging with at least one of the central columnar body and the submerged buoyant body during the installation of the floating body. Installation work can be performed in a state where the force is secured and the posture of the floating body is stabilized. As a result, during the installation work of the floating body, the support of the large offshore crane for stabilizing the posture of the floating body and preventing overturning can be made unnecessary. Thereby, the installation work of a floating body can fully be supported. Further, since the support floating body can be used as a work table, the work area in the mooring section on the water surface can be reduced.

  Further, in the floating body installation method using the support floating body, the support floating body is formed with a temporary mooring system for temporarily mooring the floating body, and when the floating body is installed by the temporary mooring system, In the installation water area of the floating body, after the anchoring mooring system sinks the fixing bottom member to which the lower end of the tension mooring line is moored to the bottom of the water and temporarily mooring the supporting floating body, the tension mooring line If the temporary mooring is released after mooring and mooring with the tension mooring line, the floating body can be tensioned and moored relatively easily.

  According to this installation method, the temporary mooring of the support floating body is performed under the effect of preventing the fall by the support floating body, so that the temporary mooring can be easily performed without fear of the fall. In addition, a temporary mooring system provided on the support floating body side lowers the anchoring subsidence member such as an anchor while supporting the weight thereof, so there is a facility such as a winch for lowering the anchoring subsidence member to the water bottom. It becomes unnecessary on the floating body side and the work ship side.

  According to the support floating body of the present invention, the floating body towing method using the support floating body, and the floating body installation method using the support floating body, at the time of work such as towing, installation, maintenance, and removal of the floating body, The support floating body temporarily arranged can sufficiently support operations such as towing and installation of the floating body.

  Especially for work such as towing, installation, maintenance inspection, removal, etc., the support floating body is tilted from the vertical direction by temporarily fixing it to at least one of the central columnar body and submerged buoyancy body of the floating body. It is possible to generate a restoring force against. Thereby, the inclination of the floating body can be suppressed and the posture can be stabilized, and the risk of rollover can be significantly reduced. As a result, it is possible to eliminate the need for support by a large offshore crane in operations such as towing and installation of the floating body, and cost reduction can be achieved.

It is the figure which showed the structure of the tension mooring floating body system with which the support floating body of embodiment which concerns on this invention is engaged. It is the figure which showed the mooring part on the water surface in embodiment which concerns on this invention. It is the figure which showed the other structure of the mooring part on the water surface. It is the top view which showed the shape of the support floating body of 1st Embodiment which concerns on this invention. It is a side view of the support floating body of FIG. It is the AA arrow line view of FIG. 4 which showed the support floating body of FIG. It is the BB arrow line view of FIG. 4 which showed the support floating body of FIG. It is EE sectional drawing of FIG.9 and FIG.10 which shows the state which engaged the floating body for assistance of FIG. 4 with the floating body of the tension | tension mooring floating body system. It is CC arrow line view of FIG. 8 which shows the state which engaged the floating body for assistance of FIG. 4 with the floating body of the tension mooring floating body system. It is the DD arrow line view of FIG. 8 which shows the state which engaged the floating body for assistance of FIG. 4 with the floating body of the tension mooring floating body system. It is a side view which shows the state which engaged the floating body for assistance of 2nd Embodiment which concerns on this invention with the floating body of the tension | tether mooring floating body system. It is the FF arrow line view of FIG. 11 which shows the state which engaged the floating body for assistance of FIG. 11 with the floating body of the tension | tether mooring floating body system. It is the GG arrow line view of FIG. 11 which shows the state which engaged the floating body for assistance of FIG. 11 with the floating body of the tension | tether mooring floating body system. It is a side view which shows the state which engaged the expansion deck with the support floating body of FIG. It is the figure which showed the state which suspended the floating body engaged with the floating body for assistance of FIG. 11 on the bottom member for fixation using an offshore crane. It is the figure which showed the state which mounts an upper structure on the floating body engaged with the floating body for assistance of FIG. It is the figure which showed the towing state of the floating body which engaged the floating body for assistance of FIG. 11, and the bottomed-down member for fixation. It is the figure which showed the state which sinks the fixed bottom member from the support floating body of FIG. It is the figure which showed the state which moored the support floating body of FIG. 11 to the fixed bottom member with a temporary mooring line. FIG. 12 is a view showing a state in which the support floating body of FIG. 11 is moored to the fixing bottom member by a temporary mooring line, and the floating body is moored to the fixing bottom member by a tension mooring line. It is the figure which showed the tension mooring state of the floating body, and the support floating body of FIG. 11 separated from the floating body. It is the arrow line view which looked down at the downward direction from the mooring part on the water surface of the floating body which showed the shape of the support floating body of 3rd Embodiment which concerns on this invention. It is the arrow line view which looked down at the downward direction from the mooring part on the water surface of the floating body which showed the shape of the support floating body of FIG. It is the arrow line view which looked at the downward direction from the mooring part on the water surface of the floating body which showed a mode that the fitting part of the support floating body of FIG. 22 was isolate | separated from the floating body. It is the arrow line view which looked at the downward direction from the upper side from the mooring part on the water surface of the floating body which showed a mode that the main part of the floating body for assistance of FIG. 22 was isolate | separated from the floating body. It is the figure which showed the towing state of the floating body engaged with the floating body for assistance of FIG. 22, and the bottomed-down member for fixation. It is the figure which showed the state which moored the support floating body of FIG. 22 to the fixed bottoming member with the temporary mooring line. It is the figure which showed the state which moored the floating body of FIG. 22 to the bottoming member for fixation only by a tension mooring line. It is the figure which showed the tension mooring state of the floating body of FIG. 22, and the support floating body isolate | separated from the floating body. It is the arrow line view which looked down at the downward direction from the mooring part on the water surface of the floating body which showed the shape of the support floating body of 4th Embodiment which concerns on this invention. It is the arrow line view which looked down at the downward direction from the mooring part on the water surface of the floating body which showed the shape of the support floating body of FIG. It is the figure which showed the towing state of the floating body engaged with the floating body for assistance of FIG. 30, and the bottomed-down member for fixation. It is the figure which showed the state which moored the support floating body of FIG. 30 to the fixed bottom member with the temporary mooring line. It is the figure which showed the state which moored the floating body of FIG. 30 to the bottoming member for fixation only by a tension mooring line. It is the figure which showed the tension mooring state of the floating body of FIG. 30, and the support floating body isolate | separated from the floating body. It is the figure which showed the structure of the tension mooring floating body system of a prior art. It is the figure which showed the state of the tension mooring floating body system called the mini TLP of a prior art.

  Hereinafter, a support floating body according to the present invention, a floating body towing method using the support floating body, and a floating body installation method using the support floating body will be described with reference to the drawings. Here, in particular, a tension mooring floating body system in which a wind power generator is mounted on an upper structure supported by the floating body will be described as an example, but the present invention is not limited to the wind power generator, and the upper structure includes an oil well drilling device, The present invention can also be applied to a tension mooring floating system equipped with other plants and measuring devices.

  First, the tension mooring floating body system 1 in which the support floating body according to the embodiment of the present invention is used will be described. This tension mooring floating body system 1 is a system for a tension mooring floating body (tension leg platform). As shown in FIG. 1, an upper structure 11 on which a wind power generator 10 is mounted, and the upper structure 11. A floating body 12 for supporting the suspension body, a plurality of tension mooring lines 13 called tendons for mooring the floating body 12 (three in one place in FIG. 1), and the tension mooring lines 13 on the seabed And a fixing subsidence member 14 for fixing to the water bottom 2 such as a lake bottom or a river bottom.

  This floating body 12 supports the weight of the wind power generator 10 and the upper structure 11 with buoyancy, and maintains the wind power generator 10 and the upper structure 11 at a preset height above the water surface. The floating body 12 includes a central columnar body 12a formed of a cylinder or a polygonal column for supporting the wind power generator 10 and the upper structure 11, and a submerged buoyancy body 12b provided below the central columnar body 12a. It has a water surface coupling body 12c disposed radially extending from the central columnar body 12a to the periphery, and a water surface mooring section 12d disposed at the end of the water surface coupling body 12c.

  The central columnar body 12a is called a center column, and a submerged buoyancy body 12b is provided below the central columnar body 12a. The central columnar body 12a and the submerged buoyancy body 12b have, for example, a hollow structure and are configured to generate buoyancy using steel, prestressed concrete (PC), or the like.

  The submerged buoyancy body 12b is a part that generates main buoyancy for supporting the upper structure at a predetermined height above the water surface, and is less susceptible to waves, such as the central columnar body 12a. A large-diameter cylindrical shape is formed, or an upper-side truncated cone shape, an intermediate-shaped cylindrical shape, and a lower-side inverted truncated cone shape are formed. By making the lower part into an inverted conical shape, the influence of the wave can be reduced as compared with the case where the cylindrical lower part is simply formed as a plane. The submerged buoyancy body 12b is provided with a ballast tank, a ballast pump, a ballast adjusting device, and the like as necessary in order to generate buoyancy changes during towing and mooring.

  And one end of the water surface coupling body 12c is connected to the upper part of the center columnar body 12a, and the other end is connected to the water surface mooring part 12d. The water surface connector 12c is preferably configured such that all or half of the surface area is above the water surface 3 at the time of still water after tension mooring, that is, in a still water surface state. Further, the water surface mooring portion 12d is also configured so that the entire surface is above the water surface 3 and is not submerged during still water after tension mooring. The upper end portion of the tension mooring line 13 for tension mooring the floating body 12 is fixed to the upper mooring portion 15c provided above the water surface of the water surface mooring portion 12d.

  The water surface connector 12c has, for example, a steel structure such as a brace structure using a steel material, a truss structure, or a ramen structure, and has a sufficient strength but a structure with a relatively small steel material weight and surface area.

  Further, the water surface mooring part 12d is formed of a hollow columnar body having a hollow part 12h through which the tension mooring line 13 is inserted, and an upper mooring part 15c is disposed above the water surface mooring part 12d. It connects with the water surface coupling body 12c. In addition, as a horizontal cross-sectional shape of this mooring part 12d on the water surface, in addition to the circle shown in FIG. 2, a polygon such as a quadrangle, a polygon with rounded corners, and the like are conceivable. Moreover, as shown in FIG. 3, the protective cover 12e for the tension mooring line 13 may be provided.

  According to this configuration, the mooring portion 12d on the water surface is provided on the water surface 3 and hardly passes through the water surface 3 except for a part of the protective cover 12e for the tension mooring line 13, etc. It hardly occurs. Therefore, the restoring force in the tension mooring floating body 1 after installation depends on the tension mooring line 13. In the configuration shown in FIG. 1, the upper mooring portion 15 is provided so as to be separated from the central columnar body 12a in plan view. The greater the separation distance, the larger the moment lever, so that a large restoring force can be obtained with a small change in tension of the same tension mooring line 13. Therefore, the water surface mooring part 12d is connected to the end of the water surface connector 12c, and the water surface mooring part 12d is provided at a position far away from the central columnar body 12a. With this configuration, the amount of change in tension of the tension mooring line 13 caused by the overturning moment acting on the floating body 12 and the upper structure 11 is reduced.

  A tension mooring line (tendon) 13 for tensioning and mooring the tension mooring floating body 1 to the anchoring bottom member 14 is formed of a steel chain, a cable, a rope, and the like, and an upper end portion thereof is a mooring portion on the water surface. A lower end portion of the upper anchoring portion 15c of 12d is attached to the lower anchoring portion 14c of the fixing bottomed member 14. During tension mooring, the length of the tension mooring line 13 is adjusted so that tension is always applied to the tension mooring line 13, and the floating body 12 is drawn into the water against the buoyancy of the floating body 12. .

  The fixing bottom member 14 is a weight made of steel or concrete, also called a template, and is used as a gravity anchor that is submerged in the water bottom 2 and fixed by its own weight. In addition, you may use the piling (pile) fixed to the ground of the water bottom 2 as a fixed bottom member. A fixing bottom member 14 shown in FIG. 1 is formed of a sinking portion 14a, a connecting portion 14b, and a lower mooring portion 14c, and the floating body 12 is preset through the tension mooring line 13 and the upper mooring portion 15c. The lower end portion of the tension mooring line 13 is fixed to the lower mooring portion 14c.

  The size of the tension mooring floating body 1 is, for example, when a power generation amount is assumed to be 2 MW, and when installed at a water depth of about 100 m to 200 m on the continental shelf, a windmill as shown in FIG. The rotating shaft 10b of the wind turbine 10a is about 75m above the water surface 3, the diameter of the central columnar body 12a of the floating body 12 is about 6m and the height is about 35m, and the submerged buoyant body 12b. Has a maximum diameter of about 15 m, and a diameter of a circle passing through the centers of the three fixing bottom members 14 is about 60 m.

  In the tension mooring floating body system 1, the static restoring force of the floating body 1 after installation can be secured by the tension mooring cable 13, and stability can be ensured. The installation work and the length of the tension mooring cable 13 can be secured during and after installation. The adjustment work can be performed at a mooring section above the water surface 3 above the water surface 3.

  Further, according to the tension mooring floating body system 1, the submerged buoyant body 12b in the lower part of the central columnar body 12a of the floating body 12 for supporting the upper structure 11 at a predetermined height on the water surface 3 can be restored. Since it can be a buoyant body for generating buoyancy that is not considered, it can be made into a shape that is not easily affected by waves.

  Thereby, since a submerged part and a submerged area become small, the water-resistant coating surface in a submerged area can be made small, and the amount of coating work and a coating material can be decreased. Accordingly, the maintenance area with respect to secular change after tension mooring is reduced, and the amount of work for maintenance management is reduced. Moreover, since the submerged area is small, the steel material weight can also be reduced.

  Further, in this tension mooring floating body system 1, by configuring the above-water surface connector 12c so that the whole surface area or half or more, preferably 2/3 or more, is above the water surface 3 at the time of still water, It is possible to reduce the amount of painting work and the amount of special paint by reducing the submerged area to zero or reducing the painting surface with the water-resistant and corrosion-resistant special paint in the submerged area. At the same time, at the time of maintenance inspection for secular change after tension mooring, the area requiring underwater work is reduced, so that maintenance management becomes easy.

  Moreover, since the upper mooring portion 12c of the tension mooring line 13 can be maintained on the water surface by configuring the mooring portion 12d on the water surface so that the entire mooring portion 12d is above the water surface 3 and does not submerge when the water is still. The attachment work of the cord 13, the tension adjustment work, the maintenance inspection work, and the like can be carried out in the air instead of underwater work.

  Therefore, workability is improved and work time is shortened, so that the cost for these work can be reduced. In addition, when the lower mooring portion 14c is sunk due to an earthquake or the like after installation, it is necessary to adjust the length of the tension mooring line 13 with respect to this unequal subsidence. In this case as well, the upper mooring portion 15c is required. Since it is on the water surface 3, underwater work becomes unnecessary and adjustment work can be performed efficiently.

  In particular, the underwater work area can be concentrated on the central columnar body 12a and the submerged buoyancy body 12b by allowing the water surface connector 12c and the water surface mooring part 12d to be completely on the water surface 3 during still water. Therefore, the efficiency of underwater work can be improved.

  However, the floating body 12 of the tension mooring floating body system 1 shown in FIG. 1 has a relatively high center of gravity, and the submerged buoyant body 12b that generates the main part of the buoyancy is directly below the central columnar body 12a. Is not taken into consideration, so it becomes unstable in a situation where tension is not moored.

  Therefore, in the present invention, the central columnar body 12a or the submerged buoyancy of the floating body 12 is supported by the towing and installation work of the floating body 12 in order to support the towing work, the installation work, the maintenance inspection work, the removal work, etc. A support system having support floating bodies 20, 30 that are temporarily engaged with at least one structure of the body 12b and separated after the work is used. In the description here, the support floating bodies 20 and 30 are described as engaging with the central columnar body 12a. However, the support floating bodies 20 and 30 may be engaged with the submerged buoyancy body 12b. You may engage both of the bodies 12b.

  Next, the support floating bodies 20 and 30 according to the first and second embodiments of the present invention will be described with reference to FIGS. The support floating bodies 20 and 30 are formed to have a buoyancy greater than its own weight and a restoring force against inclination from the vertical direction.

  First, the support floating body 20 according to the first embodiment will be described. As shown in FIGS. 4 to 10, the support floating body 20 has a recess 21 into which the central columnar body 12 a that is temporarily engaged for operations such as towing, installation, maintenance, and removal of the floating body 12 enters. And is removably engaged with the central columnar body 12a of the floating body 12.

  The concave portion 21 is determined by the horizontal cross-sectional shape of the central columnar body 12a and the number N of divisions of the support floating body 20. For example, when the horizontal cross-section of the central columnar body 12a is circular, it is divided into N (see FIGS. 10 is formed in a circular arc shape of N = 3), but when the horizontal cross section of the central columnar body 12a is a polygon such as a quadrangle, it is formed in a shape that can be easily engaged with it.

  As shown in FIGS. 9 and 10, this engagement is achieved by pulling the coupling support rope 25a with the coupling support winch 25, as shown in FIG. 9 and FIG. 10, so that the support floating body 20 is attached to the central columnar body 12a. The sliding member 22 provided on the support floating body 20 is brought into contact with the central columnar body 12a by being drawn around. At the same time, the support floating body 20 is engaged with the engagement convex portion 23 and the engagement concave portion 24 of the adjacent support floating body 20, and the engagement pins are inserted into the through holes to engage with each other. Thereby, the N support floating bodies 20 are integrated. The sliding member 22 is formed of, for example, a rotating body that rotates with the relative vertical movement of the central columnar body 12a and the support floating body 20, and smoothes the relative vertical movement.

  The support floating body 20 is provided so as to surround the central columnar body 12a, and is formed to have an area in a portion penetrating the water surface 3, and a buoyancy change due to the fluctuation of the water level in this portion is caused. Gives a restoring force against the vertical inclination of the.

  The support floating body 20 of the first embodiment is for sea conditions where the tension mooring floating body system 1 is relatively loose in wave conditions, and when integrated, it is shown in FIG. 8, FIG. 9, and FIG. As shown, a shallow draft doughnut-shaped floating body is formed, and the water surface penetrating portion at a position away from the central columnar body 12a has a large moment lever between the central columnar body 12a of the floating body. Restoration power increases. In addition, it is preferable that the support floating body 20 includes a ballast tank so as to be able to adjust the buoyancy so as to have a role of adjusting the buoyancy during operations such as towing, installation, maintenance inspection, and removal.

  Since the support floating body 20 is temporarily engaged with the central columnar body 12 a of the floating body 12 for operations such as towing and installation, the support floating body 20 is inclined together with the floating body 12. Therefore, the support floating body 20 can secure the restoring force against the inclination of the floating body 12 and can stabilize the posture of the floating body 12. In other words, the support floating body 20 can suppress the heel (lateral inclination) and trim (vertical inclination) of the floating body 12, thereby enhancing the restoring force of the floating body 12.

  Since the support floating body 20 can remarkably enhance the restoring force related to the inclination of the floating body 12 with respect to the water surface, the posture of the floating body 12 can be stabilized and the fall can be prevented. As a result, sufficient support can be provided in operations such as towing and installation of the floating body 12, and support by a large offshore crane can be eliminated.

  Further, by engaging the support floating body 20 with the central columnar body 12a, a portion necessary for the work of disassembling and removing the support floating body 20 can always be maintained near the water surface 3. Therefore, for example, when the floating body 12 is installed, that is, when the support floating body 20 is detached after the tension mooring, underwater work for removal at a deep water depth that makes the work difficult can be eliminated.

  In addition, since the support floating body 20 is separated from the central columnar body 12a after the tension mooring, the support floating body 20 can be repeatedly used when a large number of the floating bodies 12 of the tension mooring floating body system 1 are installed. As a result, the cost for towing and installation per unit of the floating body 12 can be reduced.

  Furthermore, for the tension mooring floating body system 1, the support floating body 20 is provided with a work support system. The work support system includes a ballast adjustment system for the floating body 12, a power supply system for the floating body 12, a winding system for the tension mooring line 13 for tensioning the floating body 12, and a temporary mooring for temporarily mooring the support floating body 20. The system is configured by at least one of a system, a ballast adjustment system for the support floating body 20, a power supply system for the support floating body 20, or some combination.

  Ballast adjustment of the floating body 12 is performed by adjusting the buoyancy of the submerged buoyancy body 12b. In addition, the buoyancy adjustment system of the submerged buoyancy body 12b includes, for example, a ballast pump, a ballast tank, a sea chest, a pipe, a control valve, and the like disposed below the submergence buoyancy body 12b.

  When it is necessary to deepen the draft of the floating body 12, seawater is injected into each ballast tank in the submerged buoyancy body 12b. Further, when it is necessary to make the draft of the floating body 12 shallower or to reduce the overall weight of the floating body by increasing the tension of the tension mooring line 13, the ballast water is discharged from the ballast tank. The draft and posture of the floating body 12 are adjusted by adjusting the ballast amount of the submerged buoyancy body 12b.

  Further, the ballast adjusting system is constituted by a ballast pump, a ballast tank, a sea chest that is an intake port for seawater, piping and a control valve for connecting these, although not particularly shown. When it is necessary to deepen the draft of the support floating body 20, seawater is introduced and injected into the ballast tank by the ballast pump. Further, when it is necessary to make the draft of the support floating body 20 shallow, the ballast water is discharged. By adjusting the ballast amount of these ballast tanks, the subsidence amount and posture of the support floating body 20 itself are controlled.

  As the power supply system, there are a tension mooring floating body and a support floating body, but there is no need to provide them separately, and they may be common. Although not specifically shown, this power supply system is configured to include a fuel tank, a power generation engine, a power generation device, a switchboard, a control device, a charging device, and the like. The power supply 20 is used as a power source for supplying power to each device.

  The winding system is configured to have a winding drum 26 for winding the tension mooring line 13 and a pulley (15d in FIG. 8) for changing the direction of the tension mooring line 13, as shown in FIGS. During towing of the floating body 12, the tension mooring line 13, whose tip side is fixed to the lower mooring portion 14 c of the weight sinking portion 14 a of the fixing bottom member 14, is towed in a state where it is wound around the winding drum 26. The tension mooring line 13 is fed out from the winding drum 26 via the pulley 15d and the upper end of the tension mooring line 13 is fixed to the upper mooring part 15c, and then the ballast water is drained and the tension mooring is performed. In order to assist the removal of the pulley 15d after the tension mooring, it is convenient to mount a lifting device such as a small crane (not shown) on the support floating body 20.

  Further, the temporary mooring system includes a temporary mooring winch 27 and a temporary mooring line 28 as shown in FIGS. 4 to 10, and before the floating body 12 is tensioned and moored in the installation water area, the temporary mooring system is fixed. The tip of the mooring line 28 is fixed to the temporary mooring part 14d of the weight part 14a of the bottom member 14 and temporarily moored. This temporary mooring system is configured so that it can be lowered while being suspended to the bottom 2 while supporting the weight of the fixed bottom member 14 installed on the bottom 2.

  In the example shown in FIGS. 4 to 10, on the deck of the support floating body 20, the coupling support winch 25, the tension mooring rope winding drum 26, the temporary mooring winch 27, and the temporary mooring rope pulley column 27 a In addition, a temporary mooring line 28, an air supply compressor 29 and an air supply line 29a for supplying air to the fixed bottom member 14 to give buoyancy during towing are illustrated.

  According to the configuration having this work support system, the support floating body 20 includes a part or all of the incidental facilities used on the floating body side only during operations such as towing, installation, maintenance, and removal. Can be fully supported. Thereby, a part or all of the incidental facilities of the floating body 12 can be omitted, and the cost of the entire apparatus of the floating body 12 can be reduced.

  Moreover, the space of the support floating body 20 can be made to function as a work table at the time of towing and installation. Thereby, the support of a work ship etc. at the time of installation can be reduced or made unnecessary. In addition, in the prior art, work vessels that had been supporting power supply etc. can be used only for towing for movement. The range of possible work boats will be expanded. Further, when a large number of floating bodies 12 are installed, the support floating body 20 can be used repeatedly to reduce costs for operations such as towing and installation of each floating body 12. Therefore, the cost as the whole tension mooring floating body system 1 can be reduced.

  Next, the support floating body 30 according to the second embodiment will be described. As shown in FIGS. 11 to 14, the support floating body 30 is formed to have a U-shaped columnar portion 31, a lower buoyancy portion 32, and an upper deck portion 33. At the same time, the central columnar body 12a that is temporarily engaged for operations such as towing, installation, maintenance inspection, and removal of the floating body 12 is formed to have a recess 34 into which the floating column 12 is inserted. Removably engaged with body 12a.

  This engagement is performed, for example, by bringing the support floating body 30 into contact with the central columnar body 12 a and engaging with the securing device 35. As an example of a simple configuration of the lashing device 35, for example, the lashing device 35 is formed with a detachable pipe structure (the cross section is not limited to a circle), and the support floating body 30 is formed by bolts, temporary welding, or the like Join.

  The U-shaped columnar portion 31 is configured to float on the water surface 3 with buoyancy and restoring force in a direction that prevents inclination with respect to the water surface. The lower buoyancy portion 32 is formed in a shape that has sufficient buoyancy and is less susceptible to waves. The upper deck portion 33 is formed so that sufficient restoring force can be exerted when the support floating body 30 is sunk and the deck portion 33 penetrates the water surface. Not) is also installed. Since the support floating body 30 has a portion on the wide water surface on the water surface 3 by the deck portion 33, the placement work to the central columnar body 12a and the engagement work by the lashing device 35 are facilitated.

  The concave portion 34 is formed, for example, by a U-shaped notch surrounding the central columnar body 12a when the horizontal cross section is circular, and when the horizontal cross section of the central columnar body 12a is close to a rectangle or polygon, It is formed by a notch having a shape that engages. The concave portion 34 increases the number of portions of the support floating body 30 along the central columnar body 12a, thereby facilitating various operations.

  The support floating body 30 according to the second embodiment is a marine state where the tension mooring floating body system 1 is installed in a relatively severe wave condition, and is formed as a center column type floating body in a deep draft. The restoring force against the inclination can be easily increased by the water surface penetrating portion of the upper deck portion 33 located away from 12a.

  In FIGS. 11 to 13 showing the support floating body 30 of the second embodiment, the work system shown by the support floating body 20 of the first embodiment is omitted, but this second implementation is omitted. The support floating body 30 of the embodiment is also configured by mounting various work systems in the same manner as the support floating body 20 of the first embodiment, and has the same action as the support floating body 20 of the first embodiment. Demonstrate the effect.

  FIG. 14 shows an example in which expansion decks 36 and 37 are further provided on the support floating body 30. The extension decks 36 and 37 are configured to be movable in a state where the upper deck portion 33 is placed. The extension deck 37 is formed to be foldable using a quay crane, an offshore crane, or the like. is there.

  When the floating body 12 is towed or installed, the expansion deck 37 is widened to increase the restoring force against the inclination to facilitate various operations. After the tension mooring is completed, the expansion deck 37 interferes with the tension mooring cable 13. The support floating body 30 is drawn out from the gap between the tension mooring lines 13 so as not to be folded.

  Next, a method for towing the floating body 12 using the support floating bodies 20 and 30 having the above-described configuration will be described. In this towing method, the support floating body 20 of the first embodiment is towed in a state where the support floating body 20 is engaged with the central columnar body 12a of the floating body 12, as shown in FIGS. To do. Further, the support floating body 30 of the second embodiment is towed in a state where the support floating body 30 is engaged with the central columnar body 12a of the floating body 12, as shown in FIGS.

  The engagement of the shallow draft support floating body 20 and the central columnar body 12a of the floating body 12 of the first embodiment is performed by assembling the floating body 12 on the upper part of the fixed bottom member 14 in the construction in the dock. 28 and the lower end of the tension mooring line 13 are attached. The support floating body 20 is arranged so that the support floating body 20 divided into N pieces with respect to the floating body 12 is placed on the concave portion 21 with respect to the floating body 12 via a pedestal or the like, if necessary, in the upper part of the fixed bottom member 14 in the dock. After the central columnar body 12a is disposed so as to enter, the support floating body 20 surrounding and integrated with the central columnar body 12a is engaged with the central columnar body 12a. Then, water is poured into the dock and the dock is taken out.

  In this state, the ballast adjustment of the floating body 12, the supporting floating body 20, and the fixed bottom member 14 is performed to obtain a towing state. In this towed state, since it is desired to avoid relative movement between the floating body 12 and the support floating body 20, it is desirable that the support floating body 20 be placed on the submerged buoyancy body 12b. The fixing bottom member 14 is temporarily fixed to the support floating body 20 using 14e or the like.

  Further, the engagement of the deep draft support floating body 30 and the floating body 12 in the second embodiment is assembling the floating body 12 in the construction in the dock, and if necessary, with respect to the floating body 12 via a gantry or the like. After the support floating body 30 is arranged so that the central columnar body 12a enters the recess 34, the support floating body 30 is engaged with the central columnar body 12a by the lashing device 35.

  Thereafter, the floating body 12, the supporting floating body 30, the wind power generator 10, the upper structure 11, the fixed bottom member 14 and the like are transported by a barge or the like to a sea area that is relatively calm and can secure a certain depth of water. Next, as shown in FIG. 15, the constructed anchoring member 14 is disposed on the ocean, and the floating body 12 in which the support floating body 30 is integrated is suspended by the suspension rope 42 of the crane 41 of the offshore crane 40. It is lifted and placed on the upper side of the fixed bottom member 14.

  Then, as shown in FIG. 16, the upper structure 11 and the wind power generator 10 are mounted on the floating body 12 disposed on the ocean. In this state, the ballast adjustment of the floating body 12, the support floating body 30, and the fixed bottom member 14 is performed to obtain a towing state shown in FIG. In this towing state, since it is desired to avoid relative movement between the floating body 12 and the support floating body 30, it is desirable that the support floating body 30 be fixed to the central columnar body 12a. The floating body 30 is temporarily fixed.

  8, 9, 10, and 17 are states when towing the floating body 12, and the support floating body 20 or 30 is in a state where the ballast water of the floating body 12 is lifted to some extent with ballast water. Is engaged with the floating body 12. At the same time, the fixed bottom member 14 is suspended by a temporary mooring line 28 below the support floating body 20 or 30. About half of the ballast water is injected into the fixed bottom member 14 so that the central columnar body 12 a of the floating body 12 is on the water surface 3.

  In this state, the central columnar body 12a penetrates the water surface 3, but by itself, the contribution to the restoring force with respect to the inclination is extremely small, and the height of the center of gravity of the floating body 12 from the water surface 3 is large and unstable. Since it is easy to fall, a large restoring force is generated by the support floating body 20 or 30, and the fall is prevented. In this state, the work vessel 50 such as a tugboat is towed to the installation water area.

  According to this towing method, when towing the floating body 12, the towing is performed with the support floating body 20 or 30 engaged, so that the inclination of the floating body 12 can be suppressed by the support floating body 20 or 30 and the restoring force can be secured. Thus, the posture of the floating body 12 can be stabilized. Therefore, the towing work can be sufficiently supported, and the support by the large offshore crane can be eliminated.

  Next, a method for installing the floating body 12 using the supporting floating bodies 20 and 30 having the above-described configuration will be described. In this installation operation, the mooring start state shown in FIG. 18 is changed from the towing state shown in FIGS. 8, 9, 10 and 17, and then the tension mooring is performed to obtain the installation state shown in FIG. 18 to 21, the support floating body 30 according to the second embodiment will be described. However, the support floating body 20 according to the first embodiment is different only in the way of integration and separation. This is the same setting method.

  FIG. 18 shows a state where the fixing bottom member 14 is submerged below the surface of the water by injecting further ballast water into the fixing bottom member 14 from the state of FIG. Is on the water surface 3.

  In the state of FIG. 18, as compared with the state of FIG. 17, the fixed bottom member 14 is eliminated as a part that penetrates the water surface 3, and the contribution to the restoring force with respect to the inclination is small. In this state, the floating body 12 alone is unstable and easily falls, so that the support floating body 30 generates a large restoring force from the floating state of the fixing bottom member 14 in FIG. 17 to the submerged state in FIG. 18 to prevent the falling. To do.

  In this state shown in FIG. 18, while the suspended anchoring bottom member 14 is supported by the temporary mooring line 28b, the temporary mooring line 28 and the tension mooring line 13 are extended, and as shown in FIG. take down. Thereafter, additional ballast water, concrete, or the like is poured into the fixing bottom member 14 to fix the fixing bottom member 14 to the bottom 2. After the fixing, the tying device 35 is released to freely move the support floating body 30 in the vertical direction, and the length of the tension mooring line 13 and the amount of settlement of the tension mooring floating body 1 are adjusted as shown in FIG. The upper end side of the rope 13 is fixed to the upper mooring part 15c of the mooring part 12d on the water surface, and mooring is performed.

  When mooring by the tension mooring line 13 is completed, as shown in FIG. 20, the ballast water in the ballast tank of the submerged buoyancy body 12 b is drained, the entire weight of the floating body is reduced, and the tension mooring line 13 is predetermined by the buoyancy of the floating body 12. Generate tension.

  When the predetermined tension is generated and the floating body 12 is tensioned and moored, the temporary mooring line 28 is loosened and removed from the temporary mooring part 14d, and the temporary mooring line 28 is wound up and stored by the temporary mooring winch 27 for support. The floating body 30 is separated from the floating body 12. The separation of the support floating body 30 is preferably performed at a position where the separation work on the water surface can be easily performed as much as possible. Further, the expansion deck 37 is folded to be small. The support floating body 30 is separated, and then the support floating body 30 is moved by a work boat or the like to separate the support floating body 30 from the central columnar body 12a. The tension mooring line 13 and separation of the support floating body 30 result in an installation state as shown in FIG.

  According to this installation method, when the floating body 12 is installed, the installation work is performed in a state where the support floating bodies 20 and 30 are engaged with the central columnar body 12a, so that the inclination of the floating body 12 is suppressed by the support floating bodies 20 and 30. However, the installation work can be performed in a state where the restoring force is secured and the posture of the floating body 12 is stabilized. Therefore, the posture of the floating body 12 can be stabilized and the support by the large offshore crane for preventing the fall can be eliminated.

  Furthermore, according to this installation method, the anchoring system 14 provided on the support floating bodies 20 and 30 side lowers the fixing bottom member 14 while supporting the weight thereof, so that it is fixed to the floating body 12 side or the work ship side. Equipment such as a winch for lowering the bottom sink member 14 to the bottom of the water becomes unnecessary.

  Therefore, according to the support system for the tension mooring floating body system 1 and the towing method and the installation method of the floating body 12 using the support system, in the towing work towing the floating body 12 to the installation water area, The posture of the floating body 12 can be further stabilized by increasing the height of the floating body 12, and when the floating body 12 is installed on the ocean, it is also supported when the anchoring member 14 is suspended from the floating state before the tension mooring to the submerged state. Sufficient restoring force can be applied by the floating bodies 20 and 30 for use to prevent the floating body 12 from falling.

  Further, in the installation work such as the sinking work to the bottom 2 of the anchoring anchoring member 14 for fixing the tension mooring cable 13 of the floating body 12 and the tensioning force adjustment of the tension mooring cable 13, the power supply system is operated, The mooring winch 27, the ballast pump for posture adjustment, and the like can be operated to function as a work table. As a result, during towing and installation of the floating body 12, the towing and installation work of the floating body 12 can be supported by the support floating bodies 20 and 30 that are temporarily arranged at least during towing or during installation work. .

  In addition, since the support floating bodies 20 and 30 are detached from the tension mooring floating body 1 after the tension mooring, the support floating bodies 20 and 30 can be repeatedly used when a large number of the floating bodies 12 are installed. As a result, the cost of towing and installation per one floating body 12 can be reduced.

  Further, the support floating bodies 20 and 30 can also be used for maintenance and inspection work and removal work of the floating body 12 and can support these maintenance and inspection work and removal work. The cost of maintenance inspection and removal per unit can also be reduced.

  Finally, support floating bodies 20A and 30A according to the third and fourth embodiments, which are modifications of the support floating bodies 20 and 30 according to the first and second embodiments, will be described.

  As shown in FIGS. 22 to 29, the support floating body 20 </ b> A according to the third embodiment has a slide mechanism with respect to the vertical direction, similarly to the support floating body 20 according to the first embodiment. Although the point and the point which is a shallow draft type are the same, the points which are two divisions differ with respect to the floating body 20 for assistance of 1st Embodiment being three divisions. Other configurations are the same as the configuration of the support floating body 20 according to the first embodiment.

  Further, in comparison with the support floating body 30 of the second embodiment, when the support floating body 30 of the second embodiment is engaged with the central columnar body 12a of the floating body 12, the lashing device 35 is used. On the other hand, the support floating body 20A of the third embodiment is configured to engage with the central columnar body 12a of the floating body 12 by inserting and engaging the fitting portion 20Ab with the main portion 20Aa. The upper deck of the fitting portion 20Ab is also usable as a work table. Moreover, although the support floating body 30 of the second embodiment is a deep draft type, the difference is that the support floating body 20A of the third embodiment is a shallow draft type. Other configurations are the same as the configuration of the support floating body 30 of the second embodiment.

  When the main part 20Aa and the fitting part 20Ab of the support floating body 20A are separated from the central columnar body 12a, the fitting part 20Ab is separated from the main part 20Aa as shown in FIG. Pull out from between. After that, as shown in FIG. 25, the main portion 20A is rotated about 60 degrees relative to the floating body 12 as indicated by the arrow R, and then the main portion 20Aa is separated from the central columnar body 12a. Pull out from between mooring lines 13.

  The towing method of the support floating body 20A of the third embodiment is substantially the same as the support floating bodies 20 and 30 of the first and second embodiments as shown in FIG.

  Moreover, the installation method is shown in FIGS. As shown in FIG. 27, after the support floating body 20 </ b> A in which the main portion 20 </ b> Aa and the fitting portion 20 </ b> Ab are integrated is moored to the fixed bottom member 14 by the temporary mooring line 28, the support floating body 20 </ b> A is attached to the temporary mooring line 28. The floating body 12 is moored to the fixing bottom member 14 with the tension mooring line 13 in the state moored to the fixing bottom member 14, and then the tension mooring with the tension mooring line 13 is completed by adjusting the ballast of the floating body 12 or the like. 28, the mooring of the floating body 12 is moored only by the tension mooring line 13, and the temporary mooring line 28 is recovered.

  Thereafter, as shown in FIG. 29, the fitting portion 20Ab is separated from the main portion 20Aa of the support floating body 20A, and is separated from the floating body 12 through the tension mooring lines 13. Further, the main portion 20Aa of the support floating body 20A is separated from the central column state 12a and separated from the floating body 12 through the tension mooring lines 13. Thus, the installation method of the support floating body 20A of the third embodiment is also substantially the same as the support floating bodies 20 and 30 of the first and second embodiments.

  As shown in FIGS. 30 to 35, the support floating body 30 </ b> A of the fourth embodiment is similar to the second embodiment in that it does not have a slide mechanism with respect to the vertical direction. Although it is the same as the draft type, the second embodiment is different in that it engages with the submerged buoyant body 12b while engaging with the central columnar body 12a. Other configurations are the same as the configuration of the support floating body 30 of the second embodiment.

  In comparison with the first embodiment, the support floating body 20 of the first embodiment engages with the central columnar body 12a of the floating body 12, whereas the support of the fourth embodiment. In the floating body 30A, the point of engagement with the submerged buoyant body 12b of the floating body 12 and the three supporting floating bodies 20 are integrated in the first embodiment, whereas the floating body 30A is used for the support in the fourth embodiment. The floating body 30A is different in that the three supporting floating bodies 30A are not integrated. Further, in the support floating body 30A of the fourth embodiment, the support floating body is provided so as to be easily engaged with the submerged buoyancy body 12b and to compensate for the buoyancy that the inner diameter of the support floating body 30A increases and decreases. The draft of 30A is formed deeply. Other configurations are the same as the configuration of the support floating body 20 according to the first embodiment.

  The towing method of the support floating body 30A of the fourth embodiment is also the same as that of the support floating bodies 20, 30, 20A of the first to third embodiments, as shown in FIG.

  Moreover, the installation method of 30 A of support floating bodies of 4th Embodiment is shown in FIGS. As shown in FIG. 33, after the support floating body 30A is moored to the fixed bottom member 14 by the temporary mooring line 28, the support floating body 30A is moored to the fixing bottom member 14 by the temporary mooring line 28. When the floating body 12 is moored to the fixing bottom member 14 by the tension mooring line 13 and then the tension mooring by the tension mooring line 13 is completed by adjusting the ballast of the floating body 12, etc., the mooring of the floating body 12 is performed as shown in FIG. Only the tension mooring line 13 is moored, and the temporary mooring line 28 is collected.

  After that, as shown in FIG. 35, the support floating body 30 </ b> A is divided into three parts and separated from the floating body 12 through the tension mooring lines 13. Thus, the installation method of the support floating body 30A of the fourth embodiment is also substantially the same as the support floating bodies 20, 30, and 20A of the first to third embodiments.

  In the support floating body 30A of the fourth embodiment, it is not necessary to fit the support floating body 30A into the central columnar body 12a by engaging the support floating body 30A with the submerged buoyancy body 12b. There is no need to place the support floating body 30A on the body 12b, and therefore there is no need for a gantry or the like. Therefore, the support floating body 30A can be easily installed at the dock.

  The support floating body of the present invention, the floating body towing method using the support floating body, and the floating body installation method using the support floating body include the towing operation, the installation work, the maintenance inspection work, and the removal work of the floating body of the tension mooring floating body system. When performing at least one work, the towing and installation work of the tension mooring floating body can be sufficiently supported, so the floating tow method and support for the various floating mooring bodies using the supporting floating body It can be used as a floating body installation method using a floating body.

1, 1X, 1Y Tension mooring system 2 Water bottom 3 Water surface 10 Wind power generator 11 Upper structure 12 Floating body 12a Central columnar body (center column)
12b Submerged buoyancy body 12c Water body connector 12d Water surface mooring section 13 Tension mooring line (Tendon)
DESCRIPTION OF SYMBOLS 14 Fixed bottoming member 14c Lower side mooring part 14d Temporary mooring part 14e Temporary locking member 15c Upper mooring part 20, 20A, 30, 30A Supporting floating body 20Aa Main part 20Ab Fitting part 21, 34 Recessed part 22 Sliding member 23 Engagement Convex part 24 Engaging concave part 25 Engagement support winch 25a Engagement support line 26 Winding drum 27 Temporary mooring winch 28 Temporary mooring line 31 U-shaped columnar part 32 Lower buoyancy part 33 Upper deck part 34 Recessed part 35 Locking Equipment 36, 37 Expansion deck 40 Offshore crane 50 Work ship

Claims (9)

  A floating body for supporting the superstructure, a plurality of tension mooring lines for mooring the floating body, and a fixing subsidence member for fixing the tension mooring lines to the water bottom, A floating body is arranged with a central columnar body for supporting the upper structure above the water surface, a submerged buoyant body provided below the central columnar body, and radially extending from the central columnar body in the circumferential direction. The floating body in a tension mooring floating body system configured to have a water surface coupling body and a water surface mooring portion which is disposed at an end portion of the water surface coupling body and to which an upper end portion of the tension mooring line is fixed. A support floating body for supporting at least one of towing work, installation work, maintenance inspection work, and removal work, having a buoyancy greater than its own weight and a restoring force against inclination from the vertical direction, and said floating body The central columnar body and the Deaths buoyant body engaged temporarily engaged to at least one of the structures, support for floating bodies, characterized in that it is separated after the work.   The support floating body according to claim 1, wherein the support floating body is engaged with the structure body so as to be relatively movable in the vertical direction at least during installation work.   It can be divided into two or more, and is integrated when temporarily engaging with the structure, and is divided when releasing the engagement. Floating body for support.   4. The apparatus according to claim 1, wherein after the floating body is installed, the floating body can be divided into sizes that can be pulled out from between the tension mooring lines whose upper ends are fixed to the mooring section on the water surface. The support floating body described.   The structure is configured to have a recess into which the structure is inserted, and is engaged with the structure when supporting the work, and separated from the structure after the support of the work is completed. The support floating body according to claim 1 or 2.   A system for adjusting the ballast of the floating body, a power supply system for the floating body, a winding system of a tension mooring line for tensioning the floating body, a temporary mooring system for temporarily mooring the supporting floating body, and 6. A work support system comprising at least one of a ballast adjustment system, a power supply system for the support floating body, or some combination is provided. The support floating body described.   A floating body towing method using a support floating body, wherein the floating body is towed in a state in which the support floating body according to any one of claims 1 to 6 is engaged with the structure.   The installation method of the floating body using the support floating body characterized by using the support floating body of any one of Claims 1-6 in installation of the said floating body of the said tension mooring floating body system.   The support floating body is formed with a temporary mooring system for temporarily mooring the floating body, and when the floating body is installed by the temporary mooring system, the tension mooring cable is installed by the temporary mooring system in the installation water area of the floating body. The anchoring bottom member moored to the bottom of the water is sunk down to the bottom of the water, and the support floating body is temporarily moored, and then moored by the tension mooring line, and after mooring by the tension mooring line, The temporary mooring is canceled, and the floating body installation method using the floating body for support according to claim 8.

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