JP2018173011A - Method for constructing floating body of floating offshore wind power generation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with use of a large crane ship and reduce the area of a site production yard in relation to a method for constructing a floating body of a spur type floating offshore wind power generation facility.SOLUTION: A method for constructing a floating body of a floating offshore wind power generation facility, comprises: a first step of successively installing steel rings 10 on frames 31 with a rotation function by using a first bridge crane 29 and connecting the steel rings by welding them in the circumferential direction while rotating them about the axes to complete a steel float body 4B; and a second step of moving the steel float body 4b to a concrete ring connection yard C, installing the same at a predetermined position, then successively carrying concrete rings 11 produced at a concrete ring production yard B to the concrete connection yard C, consecutively installing the concrete rings 11 to the steel float body 4B by using a second bridge crane 33, fastening and integrating them with PC steel materials 19 to complete the floating body 4.SELECTED DRAWING: Figure 3

Description

  The present invention provides a concrete floating body portion in which a plurality of concrete rings are stacked in the height direction, and each concrete ring is tightly coupled with a PC steel material to be integrated with a plurality of steel rings by welding. The present invention relates to a floating body construction method for an offshore wind power generation facility including a spar-type floating body that is composed of a steel floating body portion that is continuously provided on the upper side of a structure portion.

  Conventionally, power generation methods such as hydropower, thermal power, and nuclear power generation have been mainly employed, but in recent years, wind power generation that generates power using natural wind has attracted attention from the viewpoint of effective use of the environment and natural energy. There are two types of wind power generation facilities: land-based and water-based (mainly sea-based). In Japan, where mountainous landforms are located behind the coast, there are few plains where stable wind can be expected in the coast. It is in. On the other hand, Japan is surrounded on all sides by the sea, and it has the advantage that the wind suitable for power generation can be easily obtained and there are few restrictions on installation. Therefore, in recent years, many offshore wind power generation facilities and floating structures have been proposed.

  The floating structure is roughly classified into a pontoon type floating body that floats the floating body on the water surface, a semi-sub type that floats when the floating body is submerged under the water surface, and a spar type that floats in a standing state like a fishing float.

  In connection with the spar type floating body structure, the present applicant is an offshore wind power generation facility comprising a floating body, a mooring line, a tower, a nacelle installed at the top of the tower, and a plurality of windmill blades. The floating body is a lower concrete floating structure (hereinafter referred to as a concrete structure) in which a plurality of precast cylindrical bodies made of concrete are stacked in the height direction, and each precast cylindrical body is fastened and integrated with PC steel. Offshore wind power generation with a spar-type floating structure composed of an upper steel floating structure (hereinafter referred to as a steel floating structure) connected to the upper side of the lower concrete floating structure. We proposed a facility (hereinafter referred to as a hybrid spar type floating offshore wind power generation facility).

  In 2016, offshore Sakiyama, Goto City, Nagasaki Prefecture, we started commercializing a hybrid spar type floating offshore wind power generation facility with a total length of 172m, a total weight of 3400 tons, and a power generation scale of 2 megawatts.

  As shown in FIG. 11, the floating offshore structure of the hybrid offshore wind power generation facility is manufactured by manufacturing each steel ring obtained by dividing the steel floating body portion at a predetermined weight at a shipyard. Each steel ring is connected by welding to complete the steel floating body. And if this steel floating body part is loaded into a trolley and transported to the local production yard, the quay is drained (landed) using a 1300t class large hoist.

  On the other hand, the concrete floating body is manufactured in a concrete manufacturer's factory with one ring divided into a plurality of circumferential directions for the convenience of truck transportation, and these divided rings are transported to the local production yard by truck to the local production yard. If it couple | bonds with the circumferential direction here, each ring will be further connected to a longitudinal direction using a PC steel rod, and a concrete floating body part will be completed.

  Finally, the steel floating body part and the concrete floating body part were joined using a 1300 t class large hoist ship to complete the floating body.

Japanese Patent No. 5274329

  In the above-described floating body construction method, the steel floating body portion and the concrete floating body portion are assembled separately, and these are finally connected. For this reason, a large hoist ship is required for draining the steel floating body part and connecting it to the concrete floating body part. There are only a few large hoisting vessels in Japan. To use them, it is necessary to pay a huge loss of several million yen per day, which increases the construction cost of floating bodies.

  In addition, some crawler cranes are used in the assembling work of the concrete floating body, but the moving range of the crawler crane must be a restricted area, and the area of the local production yard is large. There was also a problem that became.

  In addition, welding and painting work for floating steel parts and adhesive application work when connecting concrete rings to concrete floating parts are affected by rainfall, so if the rain continues and the operating rate drops, the overall process will be greatly affected. There was a problem of becoming.

  Therefore, the main problem of the present invention is to eliminate the use of a large hoist ship and to reduce the area of the local production yard and to weld the steel floating body at the same time with respect to the floating body construction method of the hybrid spar type floating offshore wind power generation facility. The object of the present invention is to provide a floating body construction method for a floating offshore wind power generation facility in which painting work, adhesive application work when connecting a floating concrete ring, and the like are not affected by rainfall as much as possible.

In order to solve the above-mentioned problem, as the present invention according to claim 1, a concrete floating body portion in which a plurality of concrete rings are stacked and each concrete ring is tightly coupled with PC steel to be integrated, and a plurality of steel rings are welded. A floating body construction method of an offshore wind power generation facility comprising a spar type floating body composed of a steel floating body portion connected to the upper side of the concrete floating body structure portion,
In the local production yard, a steel ring connection yard, a concrete ring production yard, and a concrete ring connection yard are defined and provided.
A first bridge crane is provided in the steel ring connection yard so as to be able to travel in a fixed direction, and supports with a rotation function are installed at appropriate intervals in the first bridge crane traveling direction, and the first bridge crane traveling direction is also provided. A movable tent can be installed in the concrete ring production yard, a mobile tent is installed in the concrete ring production yard, and a concrete ring manufacturing facility is installed. And a mobile tent that can move in the traveling direction of the second bridge crane.
The steel ring is installed on the pedestal with the rotation function in order using the first bridge-type crane, and the steel ring is rotated around the axis center with a movable tent as necessary. A first step of welding and connecting in the circumferential direction to complete the steel floating body part,
When the steel floating body is moved to the concrete ring connection yard and installed at a predetermined position, the concrete rings manufactured in the concrete ring manufacturing yard are sequentially transported to the concrete ring connection yard, and if necessary, a mobile tent can be used. From the second step of covering the periphery, connecting the concrete ring to the steel floating body using the second bridge crane, and completing the floating body by tightly connecting and integrating them with PC steel. A floating body construction method for a floating offshore wind power generation facility is provided.

  According to the first aspect of the present invention, first, a steel ring connection yard, a concrete ring manufacture yard, and a concrete ring connection yard are defined and provided in an on-site production yard. In the first step, the steel ring is installed on the gantry with the rotation function in order using the first bridge crane, and the surroundings are covered with a mobile tent as necessary, and the steel ring is made. While rotating the ring around the axis, it is connected by welding in the circumferential direction to complete the steel floating body. Next, in the second step, if the steel floating body part is moved to the concrete ring connection yard and installed at a predetermined position, the concrete rings manufactured in the concrete ring manufacture yard are sequentially transported to the concrete ring connection yard and necessary. Accordingly, the floating body is covered with a mobile tent, and a concrete ring is continuously connected to the steel floating body portion using the second bridge crane, and the floating body is tightly integrated with a PC steel material for integration. Finalize.

  As described above, in this floating body construction method, the manufactured steel rings are assembled by connecting the steel rings at the local production yard to complete the steel floating body, thereby eliminating the use of a large hoist ship. It becomes possible.

  In addition, bridge-type cranes are installed in the steel ring connection yard and the concrete ring connection yard, and the use of crawler cranes is eliminated, so the area of the locally manufactured yard can be reduced.

  In addition, by installing mobile tents in the steel ring connection yard and the concrete ring connection yard, welding and painting work for steel floating parts and adhesive application work when connecting floating concrete rings are affected by rainfall as much as possible. As a result, the operating rate is increased and the production efficiency is greatly improved.

  On the other hand, in this construction method, the assembly of the steel floating body is first performed preferentially. Welding work of steel rings is based on the procedure of welding in the circumferential direction with a welding machine while putting the steel ring on a pedestal with a rotation function and rotating the entire steel ring around the axis. It is more efficient to build the parts. If, on the contrary, the concrete floating body part is manufactured in advance and the steel ring is connected to the steel ring by welding in sequence, a considerable amount of heavy objects, including the concrete floating body part, are placed around the axis. There is a problem that the scale of the pedestal with the rotation function becomes large, the welding quality cannot be maintained, and it takes a lot of time and effort.

  According to a second aspect of the present invention, there is provided a floating body construction method for a floating offshore wind power generation facility according to the first aspect, wherein the steel ring coupling yard and the concrete ring coupling yard are adjacently arranged in parallel. Is done.

  In the invention according to the second aspect, with respect to the layout of each yard, the steel ring connection yard and the concrete ring connection yard are arranged adjacent to each other in parallel. As a result, the area of the locally manufactured yard can be reduced, the steel ring can be drained and carried in easily, and the finished floating body can be easily removed from the beach.

  According to a third aspect of the present invention, the concrete ring manufacturing yard is arranged vertically in the moving direction of the bridge crane with respect to the steel ring connection yard. The floating structure of the floating offshore wind power generation facility according to the second aspect A method is provided.

  In the invention of claim 3, the concrete ring production yard is arranged in tandem in the moving direction of the bridge crane with respect to the steel ring connection yard. Therefore, it will be adjacent to the concrete ring connection yard, and the manufactured concrete ring can be easily moved.

  As the present invention according to claim 4, in the steel ring connection yard, a length that allows a plurality of the steel floating body portions to be arranged in tandem is secured, and a parallel operation for the plurality of groups is enabled. A floating body construction method for a floating offshore wind power generation facility according to any one of 3 is provided.

  In the invention according to the fourth aspect, the number of days required for the concrete ring connection work is about half to one-fifth of the number of days required for the steel ring connection work. In order to efficiently advance the process up to the connection work without waiting for the work, it is desirable that the steel ring connection work can be performed in parallel for a plurality of units.

  As described above in detail, according to the present invention, it is possible to eliminate the use of a large hoist ship for the floating body construction method of the hybrid spar type floating offshore wind power generation facility, and to reduce the area of the local production yard. Welding and painting work for steel floating body parts, adhesive application work when connecting floating concrete rings, etc. are not affected by rainfall as much as possible.

It is a flowchart which shows the floating body construction method which concerns on this invention. It is a top view of a field production yard. It is a bird's-eye view of a local production yard. The work procedure in a steel ring connection yard is shown, (A) is a side view, and (B) is a sectional view. The work procedure in a concrete ring connection yard is shown, (A) is a side view, and (B) is a sectional view. It is a front view of a hybrid spar type floating offshore wind power facility. It is a longitudinal cross-sectional view of a floating body. The precast cylindrical body 15 (16) is shown, (A) is a longitudinal sectional view, (B) is a plan view (a view taken along the line B-B), and (C) is a bottom view (a view taken along the line C-C). FIG. 4 is a schematic diagram (A) and (B) of the precast cylindrical body 15 (16). It is a longitudinal cross-sectional view which shows the boundary part of 4 A of lower concrete floating body structure parts, and the upper steel floating body structure part 4B. It is a flowchart which shows the conventional floating body construction method.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Hybrid spar type floating offshore wind power generation facility 1]
First, a hybrid spar type floating offshore wind power generation facility to which the present invention is applied will be described in detail with reference to FIGS.

  As shown in detail in FIG. 6, the spar-type offshore wind power generation facility 1 includes a cylindrical floating body 4, a mooring line 5, a tower 6, and a nacelle 8 installed at the top of the tower 6 and a plurality of nacelles 8. Are composed of a wind turbine 7 composed of the blades 9, 9.

  As shown in FIG. 7, the floating body 4 includes a plurality of concrete precast cylindrical bodies 15 to 16 stacked in the height direction, and the precast cylindrical bodies 15 to 16 are tightly coupled by a PC steel material 19 to be integrated. It consists of the lower concrete floating body structure portion 4A and the upper steel floating body structure portion 4B connected to the upper side of the lower concrete floating body structure portion 4A.

  In the hollow part of the floating body 4, water, gravel, fine aggregate or coarse aggregate, ballast material such as metal particles can be input or discharged, and buoyancy (draft) can be adjusted. The ballast material can be charged / discharged by adopting the fluid transportation method previously proposed by the present applicant in Japanese Patent Application Laid-Open No. 2012-201217.

  The lower concrete floating body structure portion 4 </ b> A is composed of concrete precast cylindrical bodies 15, 15... And a lower half portion of the synthetic precast member 16. As shown in FIG. 8, the precast cylindrical body 15 is a circular cylindrical precast member having the same cross section in the axial direction, and each of the precast cylindrical bodies 15 is manufactured by using the same mold or by centrifugal molding. The manufactured hollow precast member is used.

  In addition to the reinforcing bars 20, sheaths 21, 21... For inserting the PC steel bars 19 are embedded in the wall surface at appropriate intervals in the circumferential direction. A sheath widened portion 21a is formed at the lower end of the sheaths 21, 21... So that a coupler for connecting the PC steel bars 19 can be inserted, and a fixing anchor plate is fitted on the upper portion. A box opening portion 22 is provided for installation. In addition, a plurality of suspension fittings 23 are provided on the upper surface.

  As shown in FIG. 9 (A), the precast cylindrical bodies 15 are tightened by inserting the PC steel rods 19, 19... Extended upward from the lower-stage precast cylindrical body 15 into the sheaths 21, 21. However, when the precast cylindrical bodies 12 and 12 are stacked, the anchor plate 24 is fitted into the box opening portion 22, and tension is introduced into the PC steel bar 19 by the nut member 25 to achieve integration. A grout material is injected into the sheath 21 from the grout injection hole 27. The hole 24a formed in the anchor plate 24 is a grout injection confirmation hole, and the filling of the grout material is completed when the grout material is discharged from the confirmation hole.

  Next, as shown in FIG. 9B, if the coupler 26 is screwed into the protruding portion of the PC steel bar 19 and the upper PC steel bars 19, 19,. The PC steel rods 19, 19 are stacked while being inserted through the sheaths 21, 21 ... of the precast cylindrical body 15, and the PC steel rod 19 is fixed in the height direction by sequentially repeating the procedure for fixing the PC steel rod 19 according to the above procedure. At this time, an adhesive 28 such as an epoxy resin or a sealing material is applied to the joint surface between the lower-stage precast tubular body 15 and the upper-stage precast tubular body 15 in order to ensure waterproofness and join the mating surfaces. .

  Next, the composite precast member 16 has a composite structure of a concrete precast tubular body 27 and a steel tubular body 28 as shown in FIG. These are manufactured integrally. The precast cylindrical body 27 has an outer diameter dimension obtained by reducing the thickness corresponding to the thickness of the steel cylindrical body 28, and the lower half portion of the steel cylindrical body 28 is fitted on the outer periphery thereof. The upper end surface of the precast cylindrical body 27 is a fastening surface of the PC steel rod 19.

  The upper steel floating body structure portion 4 </ b> B is composed of an upper half portion of the synthetic precast member 16 and steel tubular bodies 17 and 18. The lower steel tube 17 has the same outer diameter as that of the synthetic precast member 16 at the lower portion, and is connected to the synthetic precast member 16 by bolts or welding (in the illustrated example, bolt fastening). The The upper part of the steel cylindrical body 17 has a truncated truncated cone shape with a gradually reduced diameter.

  The upper steel tubular body 18 is a tubular body having an outer diameter that is continuous with the upper outer diameter of the lower steel tubular body 17, and the lower steel tubular body 17 is connected to the lower steel tubular body 17. On the other hand, it is connected by bolts or welding (bolt fastening in the illustrated example). These steel cylindrical bodies 17 and 18 are constituted by steel rings 10, 10... Divided for each predetermined weight, and the steel rings 10, 10. Yes.

  On the other hand, the tower 6 is made of steel, concrete or PRC (prestressed reinforced concrete), but is preferably made of steel so as to reduce the total weight. The outer diameter of the tower 6 and the outer diameter of the upper steel tubular body 18 are substantially the same, and the outer shape is continuous in the vertical direction with no steps. In the illustrated example, a ladder 13 is provided on the upper part of the upper-stage steel tubular body 18, and a walkway scaffolding 14 is provided in the circumferential direction substantially at the boundary between the tower 6 and the upper-stage steel tubular body 18.

  As shown in FIG. 6, the mooring point P of the mooring line 5 to the floating body 4 is set at a position below the sea surface and higher than the center of gravity G of the floating body 4. Accordingly, the ship can be prevented from coming into contact with the mooring line 5. Further, since a resistance moment centered on the center of gravity G of the floating body 4 is generated at the mooring point P so as to prevent the floating body 4 from falling too much, the tilting posture state of the tower 6 can be maintained appropriately.

  On the other hand, the nacelle 8 is a device on which a generator that converts the rotation of the windmill 7 into electricity, a controller that can automatically change the angle of the blade, and the like are mounted.

[Building method of floating body 4]
Next, the construction method of the said floating body 4 is explained in full detail based on FIGS.

  The floating body 4 of the floating offshore wind power generation facility 1 that is the subject of the present invention is a concrete precast cylindrical body 15 to 16 (hereinafter referred to as a concrete ring 11) stacked in a plurality of stages in the height direction. , 11... Are joined together by a PC steel material 19 to form a lower concrete floating structure 4A (hereinafter referred to as a concrete floating structure 4A), and an upper side connected to the upper side of the concrete floating structure 4A. It is a spar type floating body composed of a steel floating body structure part 4B (hereinafter referred to as a steel floating body part 4B).

  Since the center of gravity can be lowered by adopting a floating body structure composed of the concrete floating body portion 4A and the steel floating body portion 4B, the stability of the floating body can be increased and the length of the floating body can be reduced. It becomes possible. Since the portion that protrudes on the sea is made of steel, it is advantageous in that it is advantageous for a ship collision.

  As shown in FIGS. 2 and 3, first, the floating body 4 is constructed in such a manner that a steel ring connection yard A, a concrete ring manufacture yard B, a concrete ring connection yard C, Is defined and provided.

  In the steel ring connection yard A, a first bridge crane 29 is provided so as to be able to travel in a certain direction, preferably toward the sea side as shown in the example, and in the first bridge crane traveling direction as appropriate. ... Are installed at intervals, and a movable tent 30 movable in the traveling direction of the first bridge-type crane is provided.

  The concrete ring production yard B is provided with a movable tent 32 and a set of concrete ring manufacturing equipment (not shown) so that the concrete ring can be produced on site.

  In the concrete ring connection yard C, a second bridge crane 33 is provided so as to be able to travel in a certain direction, preferably toward the sea as shown in the example, and is movable in the second bridge crane traveling direction. A mobile tent 34 is provided.

  Under the above facilities, the construction of the floating body 4 is performed first by the following first step and then by the following second step.

<First step>
Steel rings 10, 10 ... are manufactured at other locations such as shipyards and steel member manufacturing / processing plants, and these are towed to local production yard G on a trolley, and these steel rings 10, 10 ... are 200t. After draining (landing) with a suspended small hoist ship, it is temporarily placed in the steel ring connection yard A by a small dolly. For example, when the steel ring 10 is manufactured at a shipyard adjacent to the local production yard G or a steel member manufacturing / processing factory, the site is transported by a transporter such as a dolly or a trailer. Try to move it.

  In the steel ring connection yard A, as shown in detail in FIG. 4, the first bridge crane 29 is used, and the steel rings 10 are sequentially installed on the gantry 31 with rotation function, 31. The steel floating body 4B is completed by repeating the procedure of welding and connecting in the circumferential direction while rotating the steel ring 10 around the axis. That is, the first steel ring 10 and the second steel ring 10 are installed on the gantry 31 with a rotation function, and are connected by being welded in the circumferential direction while rotating both around the axis. Next, the next steel ring 10 is set at the adjacent position, and the entire work is connected by performing welding in the circumferential direction while rotating the whole around the axis by the pedestals 31, 31. The steel rings 10, 10... Are repeated to complete the steel floating body portion 4B, and the outer surface of the steel floating body portion 4B is painted for finishing.

  The connecting operation of the steel rings 10, 10... Is an operation in the field production yard G which is outdoors, and the operation cannot be performed when the welding operation and the painting operation are raining. Due to the influence, there is a problem that the process is delayed. Therefore, it is desirable to cover the periphery with the mobile tent 30 so that welding work and painting work can be performed if it is light rain. Estimating with the weather data of the local production yard G area, the availability factor will be improved from 48% to 73% by installing the mobile tent 30. As shown in FIG. 3, the mobile tent 30 is preferably a split mobile tent divided into two in the moving direction of the bridge crane 29. In this case, it is possible to perform the work by sandwiching and covering the steel ring 10 from both sides with the split movable tent while the bridge-shaped crane 29 is suspended.

  In the first step, the steel floating body portion 4B is first preferentially assembled prior to the assembly of the concrete floating body portion 4A. The welding operation of the steel ring 10 is carried on a pedestal 31 with a rotation function, and the assembly of the welded steel ring 10 and the steel ring 10 to be connected are rotated around the axis while being welded by a welding machine. They are connected by welding along the circumferential direction. Accordingly, if the procedure is such that the concrete floating body 4A is manufactured prior to the steel ring 10 and the steel ring 10 is sequentially connected thereto by welding, a considerable weight including the concrete floating body 4A is attached to the shaft core. In this method, first of all, the size of the pedestal 31 with a rotation function is increased, the welding quality cannot be maintained, and a lot of labor is required. By preferentially producing the floating body portion 4B, the production efficiency and the quality are maintained.

  By the way, as shown in FIG. 2, in the present example, the steel ring connection yard A has a length that allows two units of the steel floating body portion 4B to be arranged in tandem, so that parallel work for two units is possible. It has become. The number of days required for concrete ring connection work, which will be described later, is about half of the number of days required for steel ring connection work. It is desirable to double the production efficiency on the side of the steel ring connection work so that the steel floating body portion 4B can be sequentially fed so that the concrete ring connection work is not freed.

<Second step>
In the concrete ring production yard B, concrete rings 11, 11... Are produced in parallel with the steel ring connection operation. The produced concrete rings 11, 11... Are temporarily placed in the concrete ring production yard B. Also in this concrete ring production yard B, it is desirable to provide a movable tent 32 in order to enable work in rainy weather. Note that the concrete ring 11 manufactured in the concrete ring manufacturing yard B does not need to be transported by truck, and is manufactured for each ring without being divided in the circumferential direction.

  The steel floating body portion 4B manufactured in the first step is moved to the concrete ring connection yard C and installed at a predetermined position. The movement is performed using a large dolly, and as shown in FIG. 5, the steel floating body 4B is placed in a horizontal state on predetermined temporary placement tables 35, 35.

  In the concrete ring connection yard C, as shown in FIG. 5, if the concrete rings 11, 11... Manufactured in the concrete ring manufacture yard B are sequentially carried to the concrete ring connection yard C by a dolly or the like, Using the two-bridge crane 33, the concrete ring 11 is connected to the rear end of the steel floating body portion 4B, and the concrete body 11 is tightly coupled and integrated with the PC steel material 19 for each of the concrete rings 11 to form the floating body 4. Make it complete.

  In the connection work of the concrete ring 11, an adhesive is applied to each joint surface to improve waterproofness. However, this adhesive application work cannot be performed in case of rain. Due to the influence, there is a problem that the process is delayed. Therefore, it is desirable to cover the periphery with the mobile tent 33 so that the adhesive application work can be performed if it is light rain. As shown in FIG. 5, the mobile tent 33 is also a split mobile tent that is divided into two in the moving direction of the bridge crane 33 so that it can be covered from both sides with the concrete ring 11 suspended. It is desirable.

  As shown in FIG. 2 and FIG. 3, the completed floating body 4 is temporarily placed near the quay and transported to the offshore installation location by the beach departure ship 10 when a predetermined time comes. .

<Layout of each yard>
By the way, when the concrete ring connection yard C is arranged in parallel adjacent to the steel ring connection yard A, the bridge cranes 30 and 33 are arranged in parallel and run in parallel. The area can be saved. When the steel ring connection yard A and the concrete ring connection yard C are arranged in parallel so that the bridge cranes 30 and 33 travel toward the sea, the steel ring 10 is drained and loaded. It is easy to do, and the finished floating body 4 can be easily removed from the beach.

  Further, the concrete ring production yard B can be arranged in a column in the moving direction of the bridge crane 29 with respect to the steel ring connection yard A, so that the area of the locally produced yard G can be reduced. Further, as a result, the concrete ring connecting yard C is adjacent to the manufactured concrete ring 11, and the manufactured concrete ring 11 can be easily moved.

  DESCRIPTION OF SYMBOLS 1 ... Spar type offshore wind power generation equipment, 4 ... Floating body, 4A ... Concrete floating body part, 4B ... Steel floating body part, 5 ... Mooring line, 6 ... Tower, 7 ... Windmill, 8 ... Nacelle, 9 ... Blade, 10 ... Steel ring, 11 ... concrete ring, 29/33 ... bridge crane, 30/32/33 ... mobile tent, G ... on-site yard, A ... steel ring connection yard, B ... concrete ring production yard, C ... Concrete ring yard

Claims (4)

A plurality of concrete rings are stacked, and each concrete ring is tightly joined with PC steel to be integrated with a concrete floating body part and a plurality of steel rings are connected by welding, and connected to the upper side of the concrete floating body structure part. A floating body construction method for offshore wind power generation equipment comprising a spar type floating body composed of a steel floating body part,
In the local production yard, a steel ring connection yard, a concrete ring production yard, and a concrete ring connection yard are defined and provided.
A first bridge crane is provided in the steel ring connection yard so as to be able to travel in a fixed direction, and supports with a rotation function are installed at appropriate intervals in the first bridge crane traveling direction, and the first bridge crane traveling direction is also provided. A movable tent can be installed in the concrete ring production yard, a mobile tent is installed in the concrete ring production yard, and a concrete ring manufacturing facility is installed. And a mobile tent that can move in the traveling direction of the second bridge crane.
The steel ring is installed on the pedestal with the rotation function in order using the first bridge-type crane, and the steel ring is rotated around the axis center with a movable tent as necessary. A first step of welding and connecting in the circumferential direction to complete the steel floating body part,
When the steel floating body is moved to the concrete ring connection yard and installed at a predetermined position, the concrete rings manufactured in the concrete ring manufacturing yard are sequentially transported to the concrete ring connection yard, and if necessary, a mobile tent can be used. From the second step of covering the periphery, connecting the concrete ring to the steel floating body using the second bridge crane, and completing the floating body by tightly connecting and integrating them with PC steel. A floating body construction method for a floating offshore wind power generation facility.   The floating construction method for a floating offshore wind power generation facility according to claim 1, wherein the steel ring connection yard and the concrete ring connection yard are adjacently arranged in parallel.   The floating structure construction method of the floating offshore wind power generation facility according to claim 2, wherein the concrete ring manufacturing yard is arranged in tandem in the moving direction of the bridge crane with respect to the steel ring connection yard.   The floating ring type offshore according to any one of claims 1 to 3, wherein the steel ring connection yard is secured to have a length in which a plurality of steel floating body portions can be arranged in a row, and a parallel operation for a plurality of groups is possible. How to build a floating body of wind power generation equipment.

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