JP6329461B2 - Installation method of offshore windmill, floating dock for offshore windmill installation - Google Patents

Description

  The present invention relates to an installation method for an offshore wind turbine for installing a wind turbine for wind power generation on the ocean, and an offshore wind turbine installation floating dock used therefor.

  In recent years, an attempt to effectively use natural energy by installing a windmill for wind power generation on the ocean has attracted attention. For example, in Europe, a self-elevating work platform (SEP: Self Elevating Platform) is often used to install a windmill on the ocean. SEP has a proven track record as a landing-type offshore wind turbine installation method.

  As an SEP used as such a windmill installation method on the ocean, one having a leg that can be moved up and down is known (Patent Document 1).

JP 2006-37397 A

  Such SEPs have different required sizes (scales) depending on the scale of the installed windmill. For example, in order to install a 5 MW class offshore wind turbine that is expected to become the mainstream in the future, a large SEP corresponding to that will be required. However, at present, such a large SEP does not exist in Japan.

  However, a new production of a dedicated SEP is expensive and not practical. In addition, there is a method of using an existing European SEP, but it is not practical in terms of cost in consideration of expenses such as transportation of the SEP. Moreover, since it is necessary to set up a leg on the seabed, there is a restriction on the water depth to which SEP can be applied.

  The present invention has been made in view of such a problem. An offshore wind turbine installation method and an offshore wind turbine capable of installing an offshore wind turbine without using a dedicated SEP and without being restricted by water depth. It aims at providing the floating dock for windmill installation.

In order to achieve the above-described object, the first invention uses a floating dock for installing an offshore wind turbine, comprising: a floating dock; and a stand disposed on the floating dock and supporting an offshore wind turbine. The floating dock for installing the offshore wind turbine is moved to the offshore wind turbine installation position in a state where the floating dock is floated on the ocean, and the floating dock is submerged to a predetermined depth, and the gantry is relatively Step b for moving upwardly, step c for floating the floating dock in a state where the frame is fixed to the floating dock, and raising the frame to the ocean using at least the buoyancy of the floating dock ; The offshore wind turbine is previously A method of installing offshore wind turbines, characterized by comprising a step d of placing on a base provided on the wind turbine installation position.
The second invention is for installing an offshore windmill, comprising: a floating dock; a pedestal arranged on the floating dock and supporting an offshore windmill; and an elevating device provided on the floating dock for raising and lowering the gantry. Using a floating dock, with the floating dock floating above the ocean, moving the offshore wind turbine floating dock to the offshore wind turbine installation position a, sinking the floating dock to a predetermined depth, , A step b of moving upward relative to the floating dock, a step c of raising the mount to the ocean using at least the lifting device, and the offshore wind turbine in advance by a moving mechanism and a lifting device. And d) installing on a foundation provided at an offshore wind turbine installation position. Which is a method of installing offshore wind turbines, characterized.

  The gantry may float on the ocean, and the step b may sink the floating dock in a state where the gantry floats on the ocean.

  In the step b, the floating dock may be landed.

  The vertical position of the floating dock in the step c may be maintained at a semi-submersible position between the fully lifted position and the landing position.

According to the first and second aspects of the invention, it is possible to use it for installing a windmill with only a minimal improvement over a floating dock that is conventionally used when laying a caisson or the like. For this reason, an offshore windmill can be installed, without using special and large-sized SEP.

  Also, the floating dock can sink itself. In the state where the floating dock is submerged, the work is easy because it is less susceptible to the influence of ocean waves.

  In addition, the floating dock can be maintained at a semi-submersible position (so-called semi-sub) between the position where the floating dock is completely lifted and the landing position, so that the work can be performed regardless of the water depth.

  Further, if the gantry can be floated on the ocean, the floating dock can be lowered while the gantry is floated on the ocean.

  Further, if the gantry can be lifted offshore by the buoyancy of the floating dock, the gantry can be lifted to a predetermined height offshore without a special mechanism.

  Moreover, if the raising / lowering apparatus which raises / lowers a mount frame is provided, a mount frame can also be lifted on the sea using a lift apparatus.

  In addition, when the water depth is shallow, a floating dock can be landed. In this case, since the floating dock is temporarily fixed to the seabed, the shaking is suppressed.

3rd invention comprises the floating dock and the mount frame which is arrange | positioned on the said floating dock and supports an offshore windmill, The said mount lifts the said offshore windmill, the holding part which supports an offshore windmill. A lifting device, the platform is movable upward relative to the floating dock, the floating dock is capable of sinking and floating , and the platform is positioned relative to the floating dock. A floating dock for installing an offshore wind turbine, comprising a fixing mechanism that can be fixed at relatively different heights.

  According to 2nd invention, it is possible to install an offshore windmill with simple equipment.

  ADVANTAGE OF THE INVENTION According to this invention, the offshore windmill installation method and the floating dock for offshore windmill installation which can install an offshore windmill can be provided, without using exclusive SEP.

The elevation view which shows the installation process of an offshore windmill using the floating dock 1 for offshore windmill installation. The elevation view which shows the installation process of an offshore windmill using the floating dock 1 for offshore windmill installation. The elevation view which shows the installation process of an offshore windmill using the floating dock 1 for offshore windmill installation. The elevation view which shows the installation process of an offshore windmill using the floating dock 1 for offshore windmill installation. The elevation view which shows the installation process of an offshore windmill using the floating dock 1a for offshore windmill installation. The elevation view which shows the installation process of an offshore windmill using the floating dock 1a for offshore windmill installation.

  Hereinafter, the construction method of an offshore windmill using the floating dock for offshore windmill installation concerning embodiment of this invention is demonstrated. 1 to 4 are elevational views illustrating an installation process of an offshore wind turbine using the floating dock 1 for installing an offshore wind turbine.

  The floating wind turbine 1 for offshore wind turbine installation is mainly composed of a floating dock 3, a gantry 5, and the like. The floating dock 3 is conventionally used for installing a caisson or the like. The floating dock 3 has a loading weight of about 10,000 tons. This is sufficiently large as compared with 1000 to 2000 tons, which is the loading weight of the currently mainstream SEP. This is because in the case of SEP, the load weight depends on the ability of the leg lifting device.

  Thus, in the present invention, since a floating dock having a sufficient loading weight is used, even a large offshore wind turbine can be transported and installed at once without being divided into a plurality of parts and transported. Can do.

  A gantry 5 is disposed on the floating dock 3. The gantry 5 is a part that supports the offshore wind turbine. The lower part of the gantry 5 is fixed to the fixing part 9 of the floating dock 3. In addition, a lifting device 7 is disposed on the top of the gantry 5. The lifting device 7 is, for example, a winch or the like, and does not require a large crane or the like.

  In addition, although mentioned later for details, the upper part of the mount frame 5 expands-contracts, for example to an arm shape, or another moving mechanism is arrange | positioned at the mount frame 5, and the offshore windmill 11 can be moved to a horizontal direction.

  The lifting device 7 suspends the holding unit 19. The holding unit 19 is a part that holds the offshore wind turbine 11. That is, the offshore wind turbine 11 is suspended by the lifting device 7. For example, a ring-shaped guide is fixed to a part of the gantry 5 (or the holding portion 19) so that the offshore wind turbine 11 does not fall down, and the offshore wind turbine 11 is held by the guide and the holding portion 19. .

  The offshore windmill installation floating dock 1 may be self-propelled or non-self-propelled. In the case of the self-propulsion type, the floating dock 3 is floated on the ocean, and the ocean wind sails by itself while holding the offshore wind turbine 11 and moves to the vicinity of the foundation 13 constructed on the seabed 15. In the case of the non-self-propulsion method, the floating dock 1 for offshore wind turbine installation in the same state is towed by a tug boat or the like and moved to the vicinity of the foundation 13.

  After the floating dock 1 for offshore wind turbine installation is moved to a predetermined location, anchor mooring or position maintenance by a tug boat is performed as necessary. Further, a position holding system such as DPS (Dynamic Positioning System) may be mounted.

  The foundation 13 is constructed in advance by a known method. The upper end portion of the foundation 13 is exposed on the sea surface 17. The form of the foundation 13 may be other than the illustrated monopile.

  Next, as shown in FIG. 2, the fixing of the gantry 5 and the floating dock 3 is released, and the floating dock 3 is allowed to sink to a predetermined depth. The floating dock 3 is provided with a plurality of tanks isolated from each other. By injecting water into the tank, the floating dock 3 can be submerged in the water by a predetermined depth. Moreover, the attitude | position of the floating dock 3 is also controllable by adjusting the amount of water injection to the tank of each part.

  In the present embodiment, the gantry 5 can float on the ocean (sea surface 17). That is, the gantry 5 moves downward in accordance with the sinking of the floating dock 3, but after moving to the sea level 17, the pedestal 5 maintains the state where it floated. When the floating dock 3 is further submerged from this state, only the floating dock 3 sinks into the sea, and the gantry 5 rises to the ocean. That is, the gantry 5 moves upward relative to the floating dock 3.

  At this time, the floating dock 3 does not sink to the seabed 15 and is maintained at a semi-submerged position between a completely floating state and a state of landing on the seabed. The gantry 5 and the floating dock 3 are fixed again with respect to the floating dock 3 at the semi-submersible position (semi-sub). That is, relative movement between the floating dock 3 and the gantry 5 is restricted.

  Next, as shown in FIG. 3, the floating dock 3 is lifted again. In order to float the floating dock 3, the water poured into the tank may be discharged. The floating height of the floating dock 3 is set so that the lower end of the offshore wind turbine 11 is slightly higher than the upper end position of the foundation 13. Even in this state, the floating dock 3 is not in a completely lifted state, but is in a semi-submersible position. In this way, by maintaining the floating dock 3 at the semi-submersible position, it is difficult to be affected by the waves with respect to the completely floating state, and the swinging of the floating dock 3 can be suppressed.

  Next, as shown in FIG. 4, the offshore wind turbine 11 is moved substantially horizontally and moved to the base 13 by the moving mechanism. As a moving mechanism of the offshore wind turbine 11, as shown in the figure, an extendable arm 20 that can be expanded and contracted in the horizontal direction may be provided on the top of the gantry 5, and the extendable arm 20 may be extended, or other moving mechanisms may be provided. Also good. Further, the extendable arm may not be the upper part of the gantry 5, may be the lower part of the offshore wind turbine 11, and may be a plurality of places.

  With the offshore wind turbine 11 positioned on the foundation 13, the offshore wind turbine 11 is placed on the foundation 13 by the lifting device 7. Furthermore, the installation work of the offshore windmill 11 is completed by fixing the offshore windmill 11 and the foundation 13 with a bolt or the like. Note that when the offshore wind turbine 11 is moved, the posture of the floating dock 3 can be controlled by controlling the water injection and drainage into the tank of each part of the floating dock 3.

  As mentioned above, according to this Embodiment, since the existing floating dock can be utilized with the minimum improvement, without using large SEP, the offshore windmill 11 can be installed on the ocean at low cost. Moreover, since the floating dock 3 is used for sinking and floating, a large crane or the like for suspending the offshore wind turbine 11 is not necessary.

  Moreover, since it is not necessary to land a leg on the seabed 15, the offshore wind turbine 11 can be installed in the deep sea area as long as the foundation 13 can be constructed.

  Moreover, since the installation work can be performed in a state where the floating dock 3 is maintained at the semi-submersible position, it is possible to reduce the amount of shaking caused by waves compared to the case of using a normal work platform ship. For this reason, an operating rate can be improved and mooring can also be simplified.

  Next, a second embodiment will be described. FIG. 5 is a diagram showing an installation process of the offshore windmill 11 using the offshore windmill installation floating dock 1a according to another embodiment. In the following description, components having the same functions as those of the floating wind turbine installation floating dock 1 are denoted by the same reference numerals as those in FIG. The offshore windmill installation floating dock 1 a is substantially the same as the offshore windmill installation floating dock 1, but is different in that the floating dock 3 is provided with a lifting device 21.

  The lifting device 21 can fix the gantry 5 and the floating dock 3, and can raise and lower the gantry 5 up and down relatively with respect to the floating dock 3. As the elevating device 21, for example, a motor or the like may be connected to a rack and pinion type gear.

  In the present embodiment, the gantry 5 does not necessarily have to float on the ocean. After the floating dock 3 is settled, or simultaneously, the gantry 5 may be moved upward relative to the floating dock 3 by the lifting device 21. By doing in this way, even if the mount frame 5 does not float on the ocean, the offshore windmill 11 can be installed.

  In this case, the platform 5 may be raised by the lifting device 21 until the lower end of the offshore wind turbine 11 is slightly above the upper end of the foundation 13 with the floating dock 3 maintained at the semi-submersible position. . Thereafter, the offshore wind turbine 11 can be installed by fixing the offshore wind turbine 11 on the foundation 13 by the method described above.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Even when the gantry 5 does not float on the ocean, the offshore wind turbine 11 can be installed on the ocean.

  Next, a third embodiment will be described. As in the second embodiment, the third embodiment uses a floating dock 1a for offshore wind turbine installation, but is a construction method applicable when the water depth is shallow.

  In the third embodiment, when the floating dock 3 is sunk, it is landed on the seabed 15. From this state, the gantry 5 is raised to a predetermined height using the lifting device 21. Thereafter, the offshore wind turbine 11 can be installed by fixing the offshore wind turbine 11 on the foundation 13 by the method described above.

  In addition, the temporary mound with the sea bottom leveled beforehand is formed in the site | part where the floating dock 3 lands. By doing in this way, the horizontal shaking can also be suppressed by the friction between the floating dock 3 and the temporary mound.

  According to the third embodiment, when the water depth is shallow, the offshore wind turbine 11 can be installed with the floating dock 3 being landed. For this reason, the floating dock 3 is in a fixed state, and the installation work is easy. Further, since a lifting leg is not used, a large lifting device for lifting the floating dock 3 itself to the sea is unnecessary, and only the gantry 5 needs to be lifted. You can work well.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a ......... Floating dock 3 for offshore windmill installation ......... Floating dock 5 ......... Stand 7 ......... Weighting device 9 ......... Fixing part 11 ...... Offshore windmill 13 ......... Base 15 ... ... Seabed 17 ... Sea surface 19 ... Holding part 20 ... Telescopic arm 21 ... Lifting device

Claims (6)

Floating dock,
A pedestal arranged on the floating dock and supporting an offshore wind turbine;
Using a floating dock for offshore wind turbine installation,
Moving the offshore wind turbine installation floating dock to the offshore wind turbine installation position in a state where the floating dock is levitated above the ocean;
Sinking the floating dock to a predetermined depth and moving the gantry relatively upward with respect to the floating dock; and b.
A step c of levitating the floating dock in a state where the gantry is fixed to the floating dock, and raising the gantry to the ocean using at least the buoyancy of the floating dock ;
Installing the offshore windmill on a foundation previously provided at an offshore windmill installation position by a moving mechanism and a lifting device; and
The installation method of the offshore windmill characterized by comprising. Floating dock,
A pedestal arranged on the floating dock and supporting an offshore wind turbine;
An elevating device provided on the floating dock and elevating the gantry;
Using a floating dock for offshore wind turbine installation,
Moving the offshore wind turbine installation floating dock to the offshore wind turbine installation position in a state where the floating dock is levitated above the ocean;
Sinking the floating dock to a predetermined depth and moving the gantry relatively upward with respect to the floating dock; and b.
Using at least the lifting device to raise the platform to the ocean c;
Installing the offshore windmill on a foundation previously provided at an offshore windmill installation position by a moving mechanism and a lifting device; and
The installation method of the offshore windmill characterized by comprising. The cradle can float on the ocean,
3. The offshore wind turbine installation method according to claim 1, wherein in the step b, the floating dock is allowed to sink in a state where the gantry is floated on the ocean. In the step b, the installation method of offshore wind turbine according to any one of claims 1 to claim 3, characterized in that for landing the floating dock. Vertical position of the floating docks of step c is between fully floating position and landing position, any of claims 1 to 4, characterized in that it is maintained in Hanbotsusui position The installation method of the offshore windmill as described in 2. Floating dock,
A pedestal arranged on the floating dock and supporting an offshore wind turbine;
Comprising
The gantry includes a holding unit that supports the offshore wind turbine, and a lifting device that lifts the offshore wind turbine,
The gantry is movable upward relative to the floating dock;
A floating dock for offshore wind turbine installation, wherein the floating dock is capable of sinking and floating, and includes a fixing mechanism capable of fixing the gantry at different heights relative to the floating dock.

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