JP2016173096A - Offshore wind turbine installation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an offshore wind turbine installation method capable of reducing work expenditures not using SEP but using a fixed type lift work table.SOLUTION: On a work table 5 are installed separated towers 14, a nacelle 15 and blades 17. A lift work table 1 is placed on floaters 9 under a state in which lift legs 3 are not reached to a water bottom 19, towed while being floated on the water surface 21 and transported to a prescribed water area. Then, the lift legs 3 are lowered down to the water bottom 19 with lifting devices 7 and supported at the water bottom 19, the work table 5 is lifted up to a prescribed level on the water surface 21. Additionally, the floaters 9 are removed from the lift legs 3 and moved out of the prescribed water area. Then, a pile 25 is driven into the water bottom 19 under application of a jib crane 11 installed on the work table 5 while a recess part 23 at the work table 5 is applied as a work space, the divided towers 14 are connected in sequence on the piles, the nacelle 15 and the blades 17 are connected on the towers 14 to complete an offshore wind turbine.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for installing a landing type offshore wind turbine.

  In recent years, an attempt to effectively use natural energy by installing a windmill for wind power generation on the ocean has attracted attention. In order to install a windmill on the ocean, a self-elevating work platform (SEP: Self Elevating Platform) is often used. As a method of installing a windmill using SEP, after moving the hull to the foundation of the windmill while holding the windmill equipment with the holding means provided on the hull having the self-lifting device, and fixing the hull with the self-lifting device A method has been proposed in which a wind turbine equipment is suspended and fixed to a foundation by a crane device provided on the hull via a wind turbine equipment installation jig (see, for example, Patent Document 1).

  In addition, after the hull having a self-elevating device is moved with a plurality of wind turbines mounted, the hull is fixed by the self-elevating device, and then the wind turbine is gripped by the handling device provided on the hull and the foundation is located behind the hull. There is also a method in which the windmill is moved up and installed on the foundation (for example, see Patent Document 2).

  Furthermore, as a method of installing a tower structure such as a windmill on land, after assembling the guide tower so as to surround the first block tower structure installed on the foundation, another block tower structure is installed on the guide tower. There is a method of holding a lift-up device attached to and lifting it along the guide-up device to move it laterally and connecting it onto the first block tower structure (see, for example, Patent Document 3).

JP 2013-63767 A Japanese Patent No. 5383631 Japanese Patent No. 3732414

  However, SEP is expensive to manufacture and expensive to maintain. Also, when leasing, the leasing cost is high, and there are restrictions on the occupation period.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for installing an offshore wind turbine that can reduce the construction cost by using a fixed lifting work table without using SEP. That is.

  According to a first aspect of the present invention, there is provided a landing-type offshore wind turbine using a lift-type workbench having a workbench and a lift leg that moves in a vertical direction relative to the workbench. In the installation method, a lifting device is installed on the workbench, and the liftable workbench is floated on two or more floaters in a state where the lift leg does not reach the bottom of the water. In the water area, in the water area, in the water area, in the process b in which the elevating leg is lowered to the bottom, in the water area, the work table is raised to a predetermined height and the floater is moved out of the water area, and the lifting And a step d of installing an offshore wind turbine in the water area using an apparatus.

In the first invention, for example, the lifting device is a jib crane, and in step a, the component of the offshore windmill is placed on the work table and transported, and in step d, the jib crane is used. The offshore wind turbine is installed by assembling the constituent members.
The jib crane is installed on the work table via a platform for raising the height as necessary.

  In the first invention, the lifting device is a crane platform comprising a tower-shaped gantry, a girder provided protruding from an upper end of the tower-shaped gantry, and a winch provided in the girder, In step a, the offshore windmill may be held and transported by the crane mount, and in the step d, the offshore windmill may be collectively installed using the crane mount.

When the lifting device is a crane mount, the crane mount may include a reader having a grip portion of the offshore wind turbine, and the reader may be movable in the vertical direction with respect to the tower-shaped mount.
Further, it is desirable that the tower-like gantry is movable on the work table in a direction perpendicular to the girder, and the winch is movable in a direction parallel to the girder.

  In 1st invention, it is necessary to use SEP by conveying with a floater and using the fixed raising / lowering type worktable which has a workbench and the raising / lowering leg which moves to an up-down direction relatively with respect to a workbench. This eliminates the cost of installing the offshore wind turbine. In addition, by installing a jib crane or crane mount on a fixed lifting platform, rational construction is possible according to the work purpose such as foundation work of offshore wind turbines, split assembly and batch arrangement of offshore wind turbines. It becomes.

  When using a jib crane as a lifting device, if the jib crane is installed on a work table via a gantry, the jib crane can be installed at a height that is efficient for construction, and there is no need to make the specifications of the jib crane excessive.

  When a crane mount is used as a lifting device, assembled offshore wind turbines can be transported and installed together. In addition, the installation position of the offshore wind turbine can be easily adjusted by making it possible to move the frame of the crane frame in a direction perpendicular to the girder and in the direction parallel to the girder.

  A second invention is a method for installing a landing-type offshore wind turbine using an elevating workbench having a workbench and a lift leg that moves in a vertical direction relative to the workbench. In a state where the leg does not reach the bottom of the water, the step a for placing the elevating work platform on two or more floaters and floating and transporting it to a predetermined water area, and the step b for lowering the elevating leg to the bottom in the water area And raising the work table to a predetermined height and moving the floater out of the water area, and using the other lifting device arranged in the water area, on the foundation constructed in the water area A first tower member of an offshore wind turbine is installed on the work table, and a guide tower surrounding the first member member is lifted along the guide tower on the work table. Riff to move horizontally in After installing the up device, the step d of installing the offshore wind turbine by connecting the other constituent member on the first constituent member in the guide tower using the lift up device; An offshore windmill installation method characterized by comprising:

  In the second invention, it is necessary to use SEP by transporting and using a fixed lift type work table having a work table and a lift leg that moves in a vertical direction relative to the work table with a floater. This eliminates the cost of installing the offshore wind turbine. Moreover, rational installation of an offshore windmill is attained by installing a guide tower and a lift-up device on a fixed liftable workbench.

In the first and second inventions, it is desirable that the work table is provided with a notch portion used as a work space for installing the offshore wind turbine on at least one side.
If at least one side of the workbench is provided with a notch with sufficient space as a work space, the work position of the offshore wind turbine can be finely adjusted even if there is a slight shift in the fixed position of the liftable workbench It becomes. In 1st invention, by providing a notch part in a work bench | platform, the working radius of a jib crane can be made small and a lifting capacity can be suppressed.

In the first and second aspects of the invention, the floater has a notch for arranging the elevating leg on the side, and the elevating leg is arranged in the notch in the step a. A state in which the opening side of the notch is closed with a mini-floater and the floater and the workbench are fixed, the liftable workbench is transported, and the liftable workbench is mounted on the workbench It is desirable that the lifting leg can be raised and lowered.
By using two or more floaters, a double-bore type floating body is formed when transporting the liftable workbench, so that travelability during transport is good and shaking of the load is reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the installation method of the offshore windmill which can reduce a construction cost can be provided by using a fixed raising / lowering type work bench | platform without using SEP.

The figure which shows the outline | summary of the raising / lowering type workbench 1 in which the jib crane 11 was installed. The figure which shows the process of fixing the raising / lowering type worktable 1 to the water bottom 19. The figure which shows the process of installing the offshore windmill 27 The figure which shows the process of preparing for evacuation of the raising / lowering type workbench 1 The figure which shows the outline | summary of the raising / lowering type work bench | platform 1a in which the crane mount 31 was installed The figure which shows the process of installing the offshore windmill 27 The figure which shows the example in which the crane mount 31 is provided with the leader 41 The figure which shows the installation method of the offshore windmill 27 using the raising / lowering type workbench 1b The figure which shows the installation method of the offshore windmill 27 using the raising / lowering type workbench 1b

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an overview of a lifting workbench 1 on which a jib crane 11 is installed. 1A is a side view of the liftable workbench 1, FIG. 1B is a plan view of the floater 9, and FIG. 1C is a top view of the liftable workbench 1 shown in FIG. It is the figure seen from.

  As shown in FIG. 1A and FIG. 1C, the elevating workbench 1 includes a workbench 5, a lifting leg 3, a lifting device 7, and the like. The work table 5 has a substantially rectangular planar shape and includes a notch 23 on one side. The notch 23 is used as a work space for installing the offshore wind turbine 27 (FIG. 4). The size and position of the notch 23 are determined in consideration of the strength of the work table 5, the diameter of the tower 14 (FIG. 4) of the offshore wind turbine 27 to be installed, the lifting capacity of the jib crane 11, and the like.

  The elevating legs 3 are provided near the four corners of the substantially rectangular work table 5. The lifting device 7 is provided around the lifting leg 3 and is disposed on the work table 5. The lifting device 7 moves the lifting leg 3 in the vertical direction relative to the work table 5.

  On the work table 5, a jib crane 11 as a lifting device is installed. The jib crane 11 is installed on the work table 5 via a platform 29 for raising the height. A floater 9, which is a steel box, is attached to the lower part of the work table 5. The floater 9 is detachable from the work table 5. The elevating workbench 1 can move the elevating leg 3 in the vertical direction with the float 9 attached to the workbench 5.

  As shown in FIG.1 (b), the floater 9 has a pair of main body 9a. Each main body 9a has a notch 13 in which the elevating legs 3 are arranged at two lateral sides. Mini-floaters 9b are connected by pin hinges 16 in the vicinity of the two notches 13 of the main body 9a. Each mini floater 9b rotates to open and close the notch 13 of the main body 9a. The main body 9a and the mini floater 9b can be adjusted for floating by taking in and out water.

  When mounting the floater 9 on the work table 5, the mini floater 9b of the floater 9 is rotated and opened, the main body 9a is moved so that the lifting leg 3 is disposed in the notch 13 of the main body 9a, and the mini floater 9b is moved. To close the opening side of the notch 13. When removing the floater 9 from the work table 5, the mini-floater 9 b is rotated and opened, and then the floater 9 is moved in a direction that does not interfere with the lifting leg 3.

  Next, the installation method of the offshore windmill using the elevating work table 1 will be described. FIG. 2 is a diagram illustrating a process of fixing the liftable workbench 1 to the water bottom 19. FIG. 2A shows a state where the lifting leg 3 is lowered to the water bottom 19, and FIG. 2B shows a state where the work table 5 is raised. FIG. 3 is a diagram illustrating a process of installing the offshore wind turbine 27. FIG. 3A shows a state where the nacelle 15 is installed on the tower 14, and FIG. 3B shows a state where the assembly of the offshore wind turbine 27 is completed. FIG. 4 is a diagram illustrating a process of preparing for retracting the elevating workbench 1. In addition, in FIG. 1 (a), FIG. 2 (a), FIG.2 (b), FIG.3 (a), illustration of the structural member etc. of the offshore windmill mounted on the work table 5 is abbreviate | omitted.

  In order to install an offshore wind turbine using the liftable workbench 1 shown in FIG. 1, first, a divided tower which is a constituent member of the offshore windmill at a quay using a jib crane 11 installed on the workbench 5. 14, the nacelle 15 and the blade 17 are placed on the work table 5 as shown in FIG. A pile 25 (not shown) is also placed.

  Then, as shown in FIG. 1 (a), in the state where the lifting leg 3 does not reach the water bottom 19 and the lifting workbench 1 is placed on the floater 9, the lifting workbench 1 is floated on the water surface 21 to be predetermined. Transport to the waters. The state in which the lifting / lowering work table 1 is placed on the floater 9 means that the lifting / lowering leg 3 is disposed in the notch 13 of the floater 9, the opening side of the notch 13 is closed by the mini floater 9 b, and the floater 9 is closed. 5 is attached. The elevating work table 1 is towed and transported by a tugboat or the like.

  After transporting the lifting / lowering workbench 1 to a predetermined water area, the lifting / lowering leg 3 is moved by the lifting / lowering device 7 in the direction indicated by the arrow A in FIG. Then, as shown in FIG. 2A, the elevating leg 3 is lowered to the water bottom 19 and supported on the water bottom 19. Next, the floater 9 is removed from the work table 5, and the work table 5 is moved in the direction indicated by the arrow B in FIG. Then, as shown in FIG. 2 (b), the work table 5 is raised to a predetermined height on the water surface 21. Moreover, after rotating the mini-float 9b of the floater 9 out of the notch 13, the main body 9a is moved out of the water area as shown in FIG.

  As shown to Fig.3 (a), the pile 25 which is a foundation part is driven into the water bottom 19 previously. After raising the workbench 5 to a predetermined height, as shown in FIG. 3 (a), the divided towers 14 shown in FIG. 1 (c) are sequentially connected on the pile 25 using the jib crane 11, A nacelle 15 is connected on the tower 14. In addition, the nacelle 15 shown to Fig.3 (a) is front direction. Further, as shown in FIG. 3B, the blade 17 shown in FIG. 1C is assembled using the jib crane 11, and the installation of the offshore wind turbine 27 is completed.

  After the installation of the offshore wind turbine 27 is completed, as shown in FIG. 4, the elevating leg 3 is arranged in the notch 13 of the floater 9, and the notch 13 is closed by rotating the mini floater 9 b of the floater 9. Then, the work table 5 is lowered with respect to the lift leg 3 by the lifting device 7, and the floater 9 is mounted on the work table 5. Thereafter, the lifting / lowering leg 3 is raised with respect to the work table 5 by the lifting / lowering device 7 so that the lifting / lowering leg 3 does not reach the water bottom 19 as in FIG. Then, the liftable workbench 1 is floated on the water surface 21 with the liftable workbench 1 placed on the floater 9 and is retreated in the direction indicated by the arrow C so as not to interfere with the offshore wind turbine 27.

  Thus, according to 1st Embodiment, the construction cost for installing the offshore windmill 27 can be reduced by using the fixed raising / lowering working table 1 without using SEP. Moreover, by installing the jib crane 11 on the liftable workbench 1, the jib crane 11 can be used to drive the pile 25 and assemble the offshore wind turbine 27 efficiently.

  According to the first embodiment, the work table 5 is provided with the notch portion 23 used as a work space, and the jib crane 11 is installed on the work table 5 via the mount 29 to thereby set the work range of the jib crane 11. Therefore, it is not necessary to make the specifications of the jib crane 11 excessive. Further, by providing the notch portion 23 having a sufficient size as a work space, the construction position of the offshore wind turbine 27 can be finely adjusted even if a slight shift occurs in the fixing position of the liftable work table 1. .

  According to the first embodiment, since the floater 9 has the two main bodies 9a, when the liftable workbench 1 is transported, the floater 9 has a twin-bottle type floating body shape. The shaking of the object is reduced. Further, while the liftable workbench 1 is fixed to the water bottom 19, the floater 9 can be diverted to transporting another liftable workbench.

  In the first embodiment, the constituent members of the offshore wind turbine 27 and the piles 25 are placed on the elevating workbench 1 and transported to a predetermined water area. It may be transported by. Moreover, although the pile driving machine (not shown) is suspended from the jib crane 11 and driven into the pile 25, the pile 25 may be installed by other methods.

  Next, a second embodiment will be described. FIG. 5 is a diagram showing an outline of the liftable workbench 1a on which the crane mount 31 is installed. 5 (a) is a side view of the liftable workbench 1a, FIG. 5 (b) is a plan view of the floater 9, and FIG. 5 (c) is a cross-sectional view taken along arrows DD shown in FIG. 5 (a). It is.

  As shown in FIGS. 5 (a) and 5 (c), the elevating workbench 1a includes a workbench 5a, a lifting leg 3, a lifting device 7, and the like. The work table 5 has a substantially rectangular planar shape and includes a notch 23a on one side. The notch 23 a is used as a work space for installing the offshore wind turbine 27. The size and position of the notch 23a are determined in consideration of the strength of the work table 5a, the diameter of the tower 14 of the offshore wind turbine 27 to be installed, and the like.

  The elevating legs 3 are provided in the vicinity of the four corners of the substantially rectangular work table 5a. The elevating device 7 is provided around the elevating leg 3 and is disposed on the work table 5a. The lifting device 7 moves the lifting leg 3 in the vertical direction relative to the work table 5a.

  On the work table 5a, a crane mount 31 which is a lifting device is installed. The crane mount 31 includes a tower-shaped mount 32, a horizontal girder 33 provided to protrude from the upper end of the mount 32, and a winch (not shown) provided on the girder 33. The gantry 32 can be moved on the work table 5a in the direction orthogonal to the girder 33, that is, in the direction of the arrow Y shown in FIG. A winch (not shown) is movable in a direction parallel to the girder 33, that is, in the direction of the arrow X shown in FIG. In the vicinity of the lower end of the gantry 32, a wire swaying stop 34 provided so as to protrude in the same direction as the girder 33 is provided.

  A floater 9, which is a steel box, is attached to the lower part of the work table 5. The floater 9 is disposed below the lifting device 7 and is detachable from the lifting leg 3. The configuration of the floater 9 is as shown in FIG. 5B and is the same as the floater 9 shown in FIG.

  Next, the installation method of the offshore windmill using the raising / lowering work bench | platform 1a is demonstrated. FIG. 6 is a diagram illustrating a process of installing the offshore wind turbine 27.

  In order to install an offshore wind turbine using the elevating work table 1a shown in FIG. 6, first, as shown in FIG. 5 (a), a bottom 37 of the assembled offshore wind turbine 27 is mounted on a quay by a winch (not shown). The offshore wind turbine 27 is held by the crane mount 31 on the work table 5 by being suspended by the wire 35.

  Then, as shown in FIG. 5 (a), the lifting / lowering work table 1a is floated on the water surface 21 in a state where the lifting / lowering leg 3 does not reach the water bottom 19 and the lifting / lowering work table 1 is placed on the floater 9. Transport to the waters. The state where the elevating workbench 1a is placed on the floater 9 means that the elevating leg 3 is arranged in the notch 13 of the floater 9, the opening side of the notch 13 is closed by the mini floater 9b, and the floater 9 is It is in the state attached to 5a. The elevating workbench 1a is towed and transported by a tugboat or the like.

  After transporting the liftable workbench 1a to a predetermined water area, the lifter 3 is moved by the lifter 7 in the direction indicated by the arrow E in FIG. 5A with respect to the workbench 5a. Then, as shown in FIG. 6, the elevating leg 3 is lowered to the water bottom 19 and supported by the water bottom 19. Next, the floater 9 is removed from the work table 5a, and the work table 5a is moved in the direction indicated by the arrow F in FIG. Then, as shown in FIG. 6, the work table 5 a is raised to a predetermined height on the water surface 21. Further, the floater 9 is moved out of the water area in the same procedure as in the first embodiment.

  As shown in FIG. 6, a pile 25, which is a foundation portion, is driven into the water bottom 19 in advance. After raising the work platform 5a to a predetermined height, the moving mechanism 39 of the crane mount 31 and a winch (not shown) are moved as necessary to adjust the suspension position of the offshore wind turbine 27. Thereafter, as shown in FIG. 6, the offshore wind turbine 27 is suspended by a wire 35 of a winch (not shown) provided on the crane mount 31, the bottom 37 of the offshore wind turbine 27 is connected to the pile 25, and the offshore wind turbine 27 is installed. Complete.

  After the installation of the offshore wind turbine 27 is completed, the lifting leg 3 is disposed in the notch 13 of the floater 9 and the work table 5a is lowered with respect to the lifting leg 3 by the lifting device 7 as in the first embodiment. The floater 9 is mounted on the work table 5a. Thereafter, the lifting / lowering leg 3 is raised with respect to the work table 5 a by the lifting / lowering device 7, so that the lifting / lowering leg 3 does not reach the water bottom 19. Then, the elevating workbench 1 a is placed on the floater 9, floated on the water surface 21, and retracted so as not to interfere with the offshore wind turbine 27.

  As described above, according to the second embodiment, in order to install the offshore wind turbine 27 by using the fixed liftable workbench 1a without using the SEP as in the first embodiment. The construction cost can be reduced. Moreover, by installing the crane mount 31 on the liftable work platform 1a, the assembled offshore wind turbine 27 can be collectively transported and installed using the crane mount 31.

  According to the second embodiment, the work table 5 a is provided with a notch 23 a used as a work space, the frame 32 of the crane frame 31 is perpendicular to the girder 33, and the winch (not shown) is parallel to the girder 33. Therefore, even if there is a slight shift in the fixed position of the liftable workbench 1, the construction position of the offshore wind turbine 27 can be finely adjusted.

  According to the second embodiment, since the floater 9 has the two main bodies 9a, when the liftable workbench 1 is transported, the floater 9 has a twin body type floating body shape. The shaking of the object is reduced. Further, while the liftable workbench 1 is fixed to the water bottom 19, the floater 9 can be diverted to transporting another liftable workbench.

  In the first and second embodiments, the pile 25 is previously installed on the water bottom 19, but the pile 25 may not be installed on the water bottom 19 in advance. In the first embodiment, before the tower 14 is sequentially connected to the pile 25 in the step shown in FIG. 3A, a pile driving machine (not shown) is suspended from the jib crane 11 and the pile 25 is driven into the bottom 19. Good. In the second embodiment, the pile 25 may be installed on the water bottom 19 using the crane mount 31 before connecting the offshore wind turbine 27 on the pile 25 in the step shown in FIG. 6. In these cases, the notch portion 23 of the work table 5 and the notch portion 23a of the work table 5a are used as a working space for pile driving.

  In the second embodiment, the offshore wind turbine 27 is suspended and held by a winch wire 35 (not shown) provided on the crane mount 31, transported to a predetermined water area, and connected to the pile 25. The holding method of 27 and the connection method to the pile 25 are not limited to this.

  FIG. 7 is a diagram illustrating an example in which the crane mount 31 includes a reader 41. In the example shown in FIG. 7, the crane mount 31 includes a reader 41 having a grip portion 43 for gripping the offshore wind turbine 27. The grip portion 43 is provided near the upper end and the lower end of the reader 41. The leader 41 is suspended by a winch wire 35 (not shown) provided on the crane mount 31, and is movable in the vertical direction with respect to the tower-shaped mount 32.

  In the example shown in FIG. 7, the ascending / descending work table mounted on the floater 9 with the offshore wind turbine 27 held by the grip 43 of the reader 41 and held by the crane mount 31 on the quay. 1a is transported to a predetermined water area. Then, as shown in FIG. 7, the lifting leg 3 is supported on the water bottom 19, the floater 9 is removed from the work table 5 a, the work table 5 a is raised to a predetermined height above the water surface 21, and the floater 9 is moved out of the water area. Move.

  Next, the position of the leader 41 is adjusted using the moving mechanism 39 of the crane mount 31 or a winch (not shown), and the pile 25 which is the foundation is driven into the water bottom 19 using the leader 41. Thereafter, the offshore wind turbine 27 is moved above the pile 25 again using the moving mechanism 39 of the crane mount 31 or a winch (not shown), the leader 41 is lowered, and the lower end portion of the offshore wind turbine 27 is connected to the pile 25. The installation of the windmill 27 is completed.

After the installation of the offshore windmill 27 is completed, the liftable workbench 1a is floated on the water surface 21 and retracted so as not to interfere with the offshore windmill 27, as in the second embodiment.
In the example shown in FIG. 7, the same effect as that of the second embodiment can be obtained.

  Next, a third embodiment will be described. 8 and 9 are diagrams showing a method of installing the offshore wind turbine 27 using the lifting workbench 1b. FIG. 8A is a side view of the moving lifting platform 1b, FIG. 8B is a side view of the lifting platform 1b in which the lifting leg 3 is fixed to the water bottom 19, and FIG. FIG. 3 is a plan view of a liftable workbench 1b on which a lift-up device 45 and a guide tower 47 are installed.

  As shown in FIG. 8, the elevating workbench 1b includes a workbench 5b, a lifting leg 3, a lifting device 7, and the like. The work table 5 has a substantially rectangular planar shape and includes a notch portion 23b on one side. The notch 23 b is used as a work space for installing the offshore wind turbine 27. The size and position of the notch 23b are determined in consideration of the strength of the work table 5b, the diameter of the tower 14 of the offshore wind turbine 27 to be installed, and the like.

  The elevating legs 3 are provided near the four corners of the substantially rectangular work table 5b. The elevating device 7 is provided around the elevating leg 3 and is disposed on the work table 5b. The lifting / lowering device 7 moves the lifting / lowering leg 3 in the vertical direction relative to the work table 5b.

  A floater 9, which is a steel box, is attached to the work table 5b. The floater 9 is disposed below the lifting device 7 and is detachable from the lifting leg 3. The configuration of the floater 9 is the same as the floater 9 shown in FIG.

  Next, the installation method of the offshore windmill using the raising / lowering type workbench 1b is demonstrated. In order to install the offshore wind turbine 27 using the liftable workbench 1b, first, components of a lift-up device 45 and a guide tower 47 described later are placed on the workbench 5b. In FIG. 8, illustration of some of these is omitted.

  And as shown to Fig.8 (a), in the state which the raising / lowering leg 3 does not reach the water bottom 19, the raising / lowering type workbench 1b is made to float on the floater 9, and is conveyed to a predetermined | prescribed water area. The state in which the liftable workbench 1b is placed on the floater 9 means that the lift leg 3 is disposed in the notch 13 of the floater 9, the opening side of the notch 13 is closed by the mini floater 9b, and the floater 9 is closed. It is the state attached to 5b. The elevating workbench 1b is towed and transported by a tugboat or the like.

  Next, in a predetermined water area, the elevating leg 3 is lowered by the elevating device 7 in the direction of the arrow H shown in FIG. 8A, and the elevating leg 3 is supported on the water bottom 19 as shown in FIG. 8B. Let Further, the floater 9 is removed from the work table 5b, and the work table 5b is raised to a predetermined height by the lifting device 7. Further, the floater 9 is moved out of the water area.

  Before and after the movement of the liftable workbench 1b, as shown in FIG. 9, a crane 51 which is a lifting device installed on another liftable workbench 49 is used as a foundation in a predetermined water area. The pile 25 is constructed. As shown in FIG. 8C, the liftable workbench 1 b and the pile 25 are arranged so that the notch 23 b of the liftable workbench 1 b is positioned above the pile 25.

  In parallel with the above-described operation, the tower 14, the nacelle 15, and the blades 17 which are the constituent members of the offshore wind turbine 27 are transported to a predetermined water area using a trolley (not shown). And after fixing the raising / lowering type workbench 1b to the water bottom 19, it is the 1st component of the offshore windmill 27 on the pile 25 using the crane 51, as shown in FIG.8 (c) and FIG. The lower part of the tower 14 is installed. Further, using the crane 51, the guide tower 47 that surrounds the lower portion of the tower 14 and the lift-up device 45 that moves up and down along the guide tower 47 are installed on the work table 5 b.

  Thereafter, the crane 51 is used to hold the central portion of the tower 14, which is another component of the offshore wind turbine, on the lift-up device 45, and the lift-up device 45 lifts the central portion of the tower 14 along the guide tower 47 to guide it. Move horizontally in the tower 47. Then, the central portion of the tower 14 is connected to the lower portion of the tower 14 in the guide tower 47.

  The upper part of the tower 14, the nacelle 15, and the blade 17 are integrated with each other in the same manner as the central part of the tower 14, using the lift-up device 45 in the guide tower 47 above the central part of the tower 14. Connect to. This completes the installation of the offshore wind turbine as shown in FIG.

  After the installation of the offshore wind turbine 27 is completed, the guide tower 47 and the lift-up device 45 are disassembled as necessary, and the lifting leg 3 is arranged in the notch 13 of the floater 9 as in the first embodiment. The work table 5b is lowered with respect to the lift leg 3 by the lifting device 7, and the floater 9 is mounted on the work table 5b. Thereafter, the lifting / lowering leg 3 is raised with respect to the work table 5 b by the lifting / lowering device 7, and the lifting / lowering leg 3 does not reach the water bottom 19. Then, the elevating workbench 1 b is placed on the floater 9, floated on the water surface 21, and retracted so as not to interfere with the offshore wind turbine 27. The elevating work platform 49 on which the crane 51 is placed is also retracted at an appropriate time.

  Thus, according to the third embodiment, as in the first and second embodiments, the offshore wind turbine 27 is installed by using the fixed lifting workbench 1b without using SEP. Can reduce the construction cost. Further, by installing the guide tower 47 and the lift-up device 45 on the liftable workbench 1b, the offshore wind turbine 27 can be efficiently installed using these.

  According to the third embodiment, the work table 5b is provided with a notch 23b used as a work space, and the guide tower 47 and the lift-up device 45 are installed on the liftable workbench 1b after the liftable workbench 1b is fixed. As a result, even if a slight shift occurs in the fixing position of the liftable workbench 1, the construction position of the offshore wind turbine 27 can be finely adjusted.

  According to the third embodiment, since the floater 9 has the two main bodies 9a, when the liftable workbench 1b is transported, the floater 9 has a twin body type floating body shape. The shaking of the object is reduced. In addition, while the liftable workbench 1b is fixed to the water bottom 19, the floater 9 can be diverted to transport another liftable workbench.

  In the third embodiment, the other liftable work platform 49 and the crane 51 are used to install the pile 25, the lift-up device 45, and the guide tower 47. However, a work table ship or other lifting mechanism is used. May be.

  In 1st-3rd embodiment, although the pile 25 was illustrated as a foundation part, the form of a foundation part is not restricted to the pile 25, You may use the foundation part of another form.

  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.

1, 1a, 1b ......... Elevating work table 3 ......... Elevating leg 5, 5a, 5b ......... Working table 7 ......... Elevating device 9 ......... Floater 9a ......... Main body 9b ......... Mini floater 11 ......... Jib crane 13 ......... Notch 14 ......... Tower 15 ......... Nacell 17 ...... Blade 19 ......... Bottom 21 ......... Water surface 23, 23a, 23b ......... Notch 25 ... … Pile 27 ……… Offshore windmill 29 ……… Stand 31 ……… Crane stand 32 ……… Stand 33 ……… Girder 35 ……… Wire 39 ……… Movement mechanism 41 ……… Leader 43 ……… Grip 45 ... …… Lift-up device 47 ……… Guide tower 51 ……… Crane

Claims (9)

A method for installing a landing-type offshore wind turbine using a lifting / lowering work table having a work table and a lifting / lowering leg that moves in a vertical direction relative to the work table,
A step of installing a lifting device on the workbench, in a state where the lifting leg does not reach the bottom of the water, floating the lifting workbench on two or more floaters, and transporting it to a predetermined water area;
In the water area, the step b of lowering the lifting leg to the bottom of the water;
Raising the work table to a predetermined height and moving the floater out of the water area, c.
A step d of installing an offshore wind turbine in the water area using the lifting device;
The installation method of the offshore windmill characterized by comprising. The lifting device is a jib crane;
In the step a, the components of the offshore wind turbine are placed on the work table and transported,
The installation method of the offshore windmill according to claim 1, wherein in the step d, the offshore windmill is installed by assembling the constituent members using the jib crane.   3. The offshore wind turbine installation method according to claim 2, wherein the jib crane is installed on the work table via a platform for raising the height. The lifting device is a crane platform comprising a tower-shaped platform, a girder provided to protrude from the upper end of the tower-shaped platform, and a winch provided in the girder,
In the step a, the offshore windmill is held and transported by the crane mount,
The installation method of the offshore windmill according to claim 1, wherein in the step d, the offshore windmill is collectively installed using the crane mount.   The installation of the offshore wind turbine according to claim 4, wherein the crane mount includes a reader having a grip portion for the offshore wind turbine, and the reader is movable in the vertical direction with respect to the tower-shaped mount. Method.   5. The tower-like gantry is movable on the work table in a direction perpendicular to the girder, and the winch is movable in a direction parallel to the girder. The installation method of the offshore windmill of 5. A method for installing a landing-type offshore wind turbine using a lifting / lowering work table having a work table and a lifting / lowering leg that moves in a vertical direction relative to the work table,
In a state where the lifting leg does not reach the bottom of the water, the step a for carrying the lifting work table on two or more floaters and floating it to a predetermined water area;
In the water area, the step b of lowering the lifting leg to the bottom of the water;
Raising the work table to a predetermined height and moving the floater out of the water area, c.
Using another lifting device arranged in the water area, the first component member of the offshore wind turbine is installed on the foundation constructed in the water region, and the first component member is surrounded on the work table. After installing a guide tower and a lift-up device that lifts other components of the offshore wind turbine along the guide tower and moves them laterally into the guide tower, the lift tower is used in the guide tower. A step d of installing an offshore wind turbine by connecting the other components on the first component;
The installation method of the offshore windmill characterized by comprising.   The installation method of the offshore windmill according to any one of claims 1 to 7, wherein the work table includes a notch portion used as a work space for installing the offshore windmill on at least one side. . The floater has a cutout portion on the side for placing the lift leg, and in step a, the lift leg is placed in the cutout portion, and the opening side of the cutout portion is closed with a mini floater In the state where the floater and the work table are fixed, the lifting work table is transported,
9. The offshore wind turbine according to claim 1, wherein the elevating workbench is capable of raising and lowering the elevating leg in a state where the floater is mounted on the workbench. 10. Installation method.

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