JP7579588B2 - Offshore wind turbine installation ship and installation method for offshore wind turbine - Google Patents

Description

The present invention relates to a ship for constructing offshore wind turbines and a method for constructing offshore wind turbines.

Offshore wind turbines used for offshore wind power generation have traditionally been installed using SEP vessels (self-elevating work platforms: these have lifting legs (jack-up legs) and are used as platforms to raise the vessel above sea level for crane and pile driving operations). Erection of a wind turbine using an SEP vessel involves loading the turbine materials onto the SEP vessel, moving it to the installation area, setting the SEP vessel's jack-up legs on the seabed, and assembling and installing the wind turbine on the SEP vessel's platform. For this reason, the SEP vessel needs to be stationed at sea during the construction period, including the assembly of the turbine, which is one of the factors that leads to high construction costs.

In addition, the sea area where the wind turbines are to be installed is the open ocean, where effective winds are required and where meteorological and sea conditions with severe wave heights, wave periods, and wind speeds are severe, so it is necessary to complete the assembly of the wind turbines as quickly as possible. Furthermore, bottom-fixed offshore wind turbines are often constructed using an SEP vessel, which can stabilize the barge by setting jack legs on the seabed and releasing it from the sea surface without being affected by sea conditions. In this case, the construction method is to load the wind turbine components such as the tower and nacelle onto the barge, sail it to the site, lift them one by one with the deck crane on the SEP vessel, and assemble them by bolting them together. Even if an expensive SEP vessel is used, construction takes several days, which means construction costs are high.

In light of these issues, a technology for installing offshore wind turbines that does not use SEP vessels has been proposed (see Patent Document 1). This technology uses a jack-up vessel that can secure scaffolding offshore by lowering its jack-up legs to the seabed. The vessel's hull is equipped with a support structure that supports the wind turbine, and the vessel is loaded with a wind turbine assembled on land and transported to an installation site where a foundation for the wind turbine is provided. At the installation site, the scaffolding is secured with the jack-up legs, and each component that makes up the wind turbine is attached to the foundation in sequence using a handling device provided on the vessel's hull.

With this technology, the assembly of the wind turbine is carried out on land, and the ship itself is only used to transport the wind turbine to the installation site and for the duration of the installation work, but a special ship with jack-up legs is required.

Therefore, a method for installing an offshore wind turbine has been proposed that allows the installation of the wind turbine without using a special ship such as a jack-up ship (see, for example, Patent Document 2). This method is a method for installing an offshore wind turbine that erects a wind turbine with a base that can be placed on a foundation that is erected on the seabed and has a protruding part on the sea, and includes the steps of towing the pre-assembled wind turbine on a barge to the installation site, placing the base that constitutes the wind turbine on top of the foundation installed at the installation site and then lowering an anchor to the seabed to control the rocking and movement of the barge, adjusting the draft of the barge to temporarily fix the base to the protruding part of the foundation, pulling the barge out from under the base after the temporary fixation, and fixing the wind turbine to the foundation after pulling the barge out from under the base.

JP 2012-76738 A JP 2017-44141 A

In the method described in Patent Document 2, the completed wind turbines are loaded all at once using a barge with a fork, but because the top of the completed wind turbine is loaded in a free state, the support of the completed wind turbine is unstable, and because the draft of the barge is adjusted by increasing or decreasing the amount of ballast water, the lift height of the product may not be secured.

Construction using SEP vessels is also common overseas, such as in Europe, where the wind turbine is assembled as a single unit on land within the port, then lifted all at once using a large crane vessel, transported by hoist to the site, and installed on the foundation. However, when using a crane vessel to hoist and transport the completed wind turbine and install it, there are problems with the sea conditions for the jib of the conventional A-frame structure, and there are concerns that a decrease in work availability will occur in the conditions under which construction is possible, leaving room for improvement.
The inventors then came up with the idea that when installing a completed offshore wind turbine assembled from the tower, nacelle, rotor, etc. on a foundation that is erected on the seabed at the installation site and has a protruding part that protrudes out into the ocean, if the completed offshore wind turbine is equipped with a base (which is normally not necessary structurally) that protrudes from the lower outer periphery as an expansion part, then by inserting a fork part that is provided on a support part that supports the offshore wind turbine below the base, the weight of the entire offshore wind turbine can be supported and transported by the support part (fork part), eliminating the need to suspend the entire offshore wind turbine from the top of the turbine and allowing installation work to be done by simple lifting, and thus created the present invention.

The present invention provides an offshore wind turbine one-stop construction vessel and an offshore wind turbine construction method that allows the offshore wind turbine to be assembled all at once on land, towed to the site, and installed, in order to minimize on-site work and enable the assembly of the offshore wind turbine.

The present invention relates to an offshore wind turbine one-stop construction ship that installs an offshore wind turbine on a foundation that is erected on the seabed at an installation site and has a protruding part that protrudes out into the ocean , the offshore wind turbine is a completed form in which components including a tower, nacelle, and rotor are assembled, and a base that can be placed on the protruding part of the foundation is provided protruding from the lower outer periphery, and the offshore wind turbine is provided with a barge, a jib that is provided on the hull of the barge and a part of which protrudes outside the hull, an upper catch part that is provided on an upper part of the jib and is capable of holding an upper part of the offshore wind turbine, and a lower catch part that is provided on a lower part of the jib corresponding to the upper catch part and has a fork part that supports a lower part of the offshore wind turbine via the base, and when the offshore wind turbine is transported, the upper catch part is attached to the offshore wind turbine outside the hull. While holding the upper part of the wind turbine, the lower catch part supports the entire weight of the offshore wind turbine with the lower catch part by inserting the fork part under the base, and holds the lower part of the offshore wind turbine. The upper catch part comprises a mounting base attached to the protruding part of the jib and extending in the left-right direction, left and right arm members whose base ends are attached to the mounting base so as to be horizontally rotatable, left and right lower members provided on each arm member and movable in the left-right direction on the arm members, and left and right upper members provided on the lower members and movable in the front-rear direction on the lower members, and when transporting the offshore wind turbine , the left and right upper members sandwich the upper part of the offshore wind turbine to hold the upper part of the offshore wind turbine.

In this way, the equipment can be assembled on land, towed to the site, and installed there, significantly shortening on-site work time and enabling offshore wind turbines to be installed without using an SEP vessel. In addition, the upper and lower parts of the offshore wind turbine can be grasped with the upper and lower catch parts, and the offshore wind turbine can be secured during transportation to prevent it from falling over. In particular, the pin removal work for the hanging pieces and the like on-site is difficult due to the rocking of the ship's hull, but by inserting the fork part of the lower catch part into the underside of the base and supporting (inserting and holding) it is possible to support the weight of the entire wind turbine, eliminating the need to lift the entire offshore wind turbine from the top of the turbine and making lifting easier. This eliminates the need to remove the pins of the hanging pieces and the like, which are necessary for lifting work, and shortens on-site installation work time, allowing safe installation work with simple lifting. In addition, offshore wind turbines are currently becoming larger, but the structure is such that the upper and lower catch sections hold the top and bottom of the turbine, secure the turbine during transport, and support it with the lower catch section, making it easy to accommodate future increases in size.

Furthermore, position adjustment in the left-right and front-back directions is easy, and the offshore wind turbine can be securely held.

The mounting base can be structured so that rollers are rotatably mounted between the left and right arm members and come into contact with the outer circumferential surface of the offshore wind turbine when the offshore wind turbine is in a held position.

The left and right upper members can have a convex portion with an inner peripheral surface that corresponds to the shape of the outer peripheral surface of the offshore wind turbine, and a plurality of rollers or tires that come into contact with the outer peripheral surface of the offshore wind turbine when the offshore wind turbine is held can be rotatably mounted on the inner peripheral surface. In this way, the position in the circumferential direction can be adjusted.

The tip of the protrusion of the left and right upper members can be provided with a connecting means that can connect the left and right upper members while the offshore wind turbine is in a held state. In this way, the holding is reliable.

The lower catch part is preferably provided with a support body part that is movable up and down with respect to the jib and extends in the left-right direction, left and right support members whose rear ends are connected near the left and right ends of the support body part and extend forward, left and right lower members that are provided above the left and right support members and can move in the left-right direction, and left and right upper members that are provided above the left and right lower members and can move in the front-rear direction, and the fork part includes the left and right support members, the left and right lower members, and the left and right upper members, and when the offshore wind turbine is transported, the left and right upper members hold the lower part of the offshore wind turbine by sandwiching it between them. In this way, position corrections can be made in the front-rear and left-right directions when the offshore wind turbine is installed on a foundation.

In this case, it is desirable that the left and right upper members have a convex portion with an inner peripheral surface that corresponds to the shape of the outer peripheral surface of the offshore wind turbine, and that a plurality of rollers or tires that come into contact with the outer peripheral surface of the offshore wind turbine when the offshore wind turbine is held are provided on the inner peripheral surface so as to be rotatable by a driving means. In this way, it is possible to easily adjust the circumferential position between the foundation and the base of the offshore wind turbine.

If the lower catch part is structured to have shock absorbers between the left and right lower members and the left and right upper members to absorb vertical impacts, and a main winding pulley part that can be raised and lowered relative to the jib is provided, and the lower catch part is structured to have shock absorbers between the support body part and the main winding pulley part to absorb vertical impacts, the offshore wind turbine (base) can be softly landed on the foundation during installation. Also, it becomes possible to minimize the effects of sea conditions.

In these cases, the barge can be a semi-submersible vessel, whose hull's waterline can be adjusted in the vertical direction. In this way, not only can the vertical position of the lower catch part be adjusted, but the semi-submersible vessel has a hull shape that can reduce the amount of hull rolling, so by deepening the draft of the semi-submersible vessel at the installation site, it is possible to minimize the effects of sea conditions.

The present invention also relates to a method for installing an offshore wind turbine on a foundation that is erected on the seabed at an installation site and has a protruding part protruding out into the ocean, the offshore wind turbine is a completed form assembled from parts including a tower, nacelle, and rotor, and a base that can be placed on the protruding part of the foundation is provided protruding from the lower outer periphery, and a barge is used in which upper and lower catch parts are provided correspondingly above and below at positions where a jib protrudes outside the hull and the upper and lower parts of the offshore wind turbine can be held by the upper and lower catch parts , the upper catch part comprises an attachment base that is attached to the protruding part of the jib and extends in the left and right directions, and left and right arm members whose base ends are attached to the attachment base so as to be horizontally rotatable, the lower catch portion has a fork portion that is inserted under the underside of the base of the offshore wind turbine, and the lower catch portion includes a step of inserting the fork portion of the lower catch means under the base of the offshore wind turbine that has been preassembled to hold a lower portion of the offshore wind turbine, while sandwiching an upper portion of the offshore wind turbine between the left and right upper members to hold the upper portion of the offshore wind turbine with the upper catch portion; a step of towing the barge while holding the upper and lower portions of the offshore wind turbine to move it to the installation site; a step of placing the base of the offshore wind turbine on a protruding portion of the foundation at the installation site and fixing the base to the protruding portion; and a step of releasing the holding by the upper and lower catch portions after the fixing, to move the barge away from the offshore wind turbine. In this way, the offshore wind turbine can be assembled on land in advance, then transported to the site and installed there, significantly reducing on-site work time. The fork part of the lower catch part is inserted under the base to support (insert and hold), making it possible to easily support the weight of the entire wind turbine, eliminating the need to remove pins such as hanging pieces that are required for lifting work. This also reduces the time required for on-site installation work, allowing for safer work. Furthermore, since the upper and lower parts of the offshore wind turbine are held by the upper and lower catch parts without suspending the entire offshore wind turbine from the top of the turbine, it will be possible to accommodate future increases in the size of offshore wind turbines.

In this case, the lower catch part comprises a support main body part extending in the left-right direction and arranged to be able to rise and fall relative to the jib, left and right support members whose rear ends are connected near the left and right ends of the support main body part and extend forward, left and right lower members arranged on the upper side of each of the left and right support members and movable in the left-right direction, and left and right upper members arranged on the upper side of each of the left and right lower members and movable in the front-rear direction, and the fork part includes the left and right support members, the left and right lower members, and the left and right upper members, and when the offshore wind turbine is transported, the left and right upper members sandwich a lower part of the offshore wind turbine to hold the lower part of the offshore wind turbine, and the offshore wind turbine is placed on a support stand installed on the shore with the base resting on it before transportation, and the lower catch part supports the weight of the entire offshore wind turbine from below by inserting the fork part under the base on the support stand, thereby making it easy to hold the upper and lower parts of the offshore wind turbine.

The present invention allows the offshore wind turbine to be assembled all at once on land, then transported to the installation site and installed on site, significantly shortening on-site work time and making it possible to install the offshore wind turbine without using an SEP ship. In addition, the upper and lower parts of the offshore wind turbine are held in place by upper and lower catch sections, so the offshore wind turbine can be secured during transportation to prevent it from tipping over. This eliminates the need to consider the jib strength and overall rigidity required for hanging transportation, as is the case when the offshore wind turbine is hoisted and transported.

FIG. 1 is an overall view of an offshore wind turbine integrated construction ship according to the present invention. FIG. 4 is a front view showing an upper catch portion provided on the offshore wind turbine integrated construction vessel, illustrating a state in which the offshore wind turbine is fixed. FIG. 2 is a plan view showing the state in which the offshore wind turbine is fixed. FIG. FIG. 4 is a front view showing a lower catch portion provided on the offshore wind turbine integrated construction vessel, illustrating a state in which the offshore wind turbine is fixed. FIG. 2 is a plan view showing the state in which the offshore wind turbine is fixed. FIG. 2 is a front view showing the state in which the offshore wind turbine is fixed. FIG. FIG. FIG. FIG. 11 is an explanatory diagram showing another embodiment. FIG. 11 is an explanatory diagram showing a beach-exposed state according to still another embodiment. FIG. FIG.

The following describes an embodiment of the present invention with reference to the drawings.

Figure 1 is an overall view of the offshore wind turbine installation ship of the present invention.

As shown in FIG. 1, the offshore wind turbine one-stop construction ship 1 according to the present invention is used to install an offshore wind turbine U (a completed offshore wind turbine assembled with a tower, nacelle, rotor, etc.; see FIG. 8). However, this offshore wind turbine U has a rectangular plate-shaped base U1 (widening portion) protruding over the entire lower periphery, which can be placed on a foundation F (see FIG. 10) that is erected on the seabed at the installation site and has a protruding portion F1 above the sea. Such a base U1 is not necessary structurally, but by providing the rectangular plate-shaped base U1, the lower catch portion 5 can support the entire weight of the offshore wind turbine U by inserting the fork portion of the lower catch portion 5, which will be described later, below the base U1.

The offshore wind turbine one-stop construction ship 1 is provided with a jib 3, part of which protrudes outside the hull, on the hull of a barge 2 (transport ship). An upper catch part 4 is provided on the top of the jib 3, and a lower catch part 5 is provided on the bottom of the jib 3 in correspondence with the upper catch part 4. The lower catch part 5 is provided so that it can be raised and lowered by a hanging rope 6.

When the offshore wind turbine U is transported, the upper catch portion 4 holds the upper portion of the offshore wind turbine U outside the hull, while the lower catch portion 5 holds (supports) the lower portion of the offshore wind turbine U with the fork portion (including arm members 12L, 12R, lower members 14L, 14R, and upper members 15L, 15R, which will be described later) inserted under the base U1 of the offshore wind turbine U. Thus, the lower portion of the offshore wind turbine U is supported via the base U1.

As shown in Figs. 2 to 4, the upper catch section 4 includes an attachment base 11 that is attached to the protruding portion of the jib 3 and extends in the left-right direction, and left and right arm members 12L, 12R whose base ends are supported by the attachment base 11 so as to be horizontally rotatable around a vertical axis. The left and right arm members 12L, 12R are connected near the center in the longitudinal direction (front-rear direction) to the attachment base 11 (outside the portion where the left and right arm members 12L, 12R are supported) via catch opening/closing cylinders 13L, 13R. The left and right arm members 12L, 12R rotate horizontally to open and close as the catch opening/closing cylinders 13L, 13R extend and retract. Then, when the left and right arm members 12L, 12R are closed, the left and right upper members 15L, 15R described later grip the upper part of the offshore wind turbine U to hold it so that it does not fall over.

Lower members 14L, 14R that can move left and right (width direction of the barge 2) on the arm members 12L, 12R are provided on each arm member 12L, 12R, and upper members 15L, 15R that can move forward and backward (longitudinal direction of the barge 2) are provided on the lower members 14L, 14R. In other words, left and right position adjustment jacks 16R, 16L are provided between the arm members 12L, 12R and the lower members 14L, 14R, and forward and backward position adjustment jacks 17R, 17L are provided between the lower members 14L, 14R and the upper members 15L, 15R.

The mounting base 11 also has rollers 19 rotatably mounted between the left and right arm members 12L, 12R via a front-rear position adjustment jack 18. When the offshore wind turbine U is in a held state, the rollers 19 rotatably contact the outer circumferential surface of the offshore wind turbine.

The left and right upper members 15L, 15R have convex portions 15La, 15Ra with inner circumferential surfaces that correspond to the shape of the outer circumferential surface of the offshore wind turbine, and a number of rollers 20 (or tires) that come into contact with the outer circumferential surface of the offshore wind turbine U when the offshore wind turbine U is held are provided on the inner circumferential surfaces of the convex portions 15La, 15Ra so as to be rotatable about a horizontal axis.

At the tip of the convex parts 15La, 15Ra of the left and right upper members 15L, 15R, the connecting parts 7L, 7R are formed, respectively, which are connected when the offshore wind turbine U is held, and when the offshore wind turbine U is held, they are connected so as to be separable. In addition, a catch fixing jack 21 is provided on the upper side of the tip (connecting parts 7L, 7R) of the convex part 15La (or 15Ra), and when the offshore wind turbine U is held (i.e., when the two connecting parts 7L, 7R are connected), the fixing pin of the catch fixing jack 21 penetrates the two connecting parts 7L, 7R, and the holding state is maintained. In this way, at the tip of the convex parts 15La, 15Ra of the left and right upper members 15L, 15R, the connecting means 22 is formed, which connects the connecting parts 7L, 7R when the offshore wind turbine U is held. Therefore, when the offshore wind turbine U is transported, the upper part of the offshore wind turbine U can be securely held between the left and right upper members 15L and 15R.

As shown in Figures 5 to 7, the lower catch part 5 includes a support body part 31 that is arranged to be raised and lowered relative to the jib 3 and extends in the left-right direction, and left and right support members 32L, 32R whose rear ends are connected near the left and right ends of the support body part 31 and extend forward in parallel. Left and right lower members 33L, 33R that can move in the left-right direction are provided on the upper side of each of the left and right support members 32L, 32R, and left and right upper members 34L, 34R that can move in the front-rear direction are provided on the upper side of each of the left and right lower members 33L, 33R. When the offshore wind turbine U is held, the left and right upper members 34L, 34R sandwich the offshore wind turbine U from both the left and right sides. When the offshore wind turbine U is transported, the left and right upper members 34L, 34R sandwich and hold the lower part of the offshore wind turbine U. The support body 31 has a main pulley 9 connected to the hanging rope 6 at its upper part, and is guided by the guide mechanism 10 of the jib 3 using the hanging rope 6 to ascend and descend.

In other words, left-right position adjustment jacks 35R, 35L are provided between the left and right support members 32L, 32R and the lower members 33L, 33R, and front-rear position adjustment jacks 36L, 36R are provided between the lower members 33L, 33R and the upper members 34L, 34R.

The left and right upper members 34L, 34R have convex portions 34La, 34Ra having inner circumferential surfaces shaped to correspond to the shape of the outer circumferential surface of the offshore wind turbine U, and a plurality of rollers 37 (or tires) that come into contact with the outer circumferential surface of the offshore wind turbine U when the offshore wind turbine U is held are provided on the inner circumferential surfaces and are rotatable around a vertical axis by a motor 38 (driving means).
Therefore, the lower catch part 5 (support main body part 31), which holds the entire weight of the offshore wind turbine U, is guided by the guide mechanism 10 and raised and lowered by winding up and releasing the suspension rope 6; during this process, the rollers 37 of the support main body part 31 suppress the swinging of the lower part of the offshore wind turbine U, and similarly, the rollers 19, 20 of the mounting base 11 suppress the swinging of the upper part of the offshore wind turbine U, allowing the offshore wind turbine U to be raised and lowered without swinging.

Shock absorbers 39 (e.g., hydraulic cylinder systems) that absorb vertical shocks are provided between the left and right lower members 33L, 33R and the left and right upper members 34L, 34R, allowing for a soft landing on the foundation F during installation.

As explained above, by using a barge 2 that has upper and lower catch parts 4, 5 that correspond to the top and bottom at the positions where the jib 3 protrudes outside the hull and can hold the upper and lower parts of the offshore wind turbine U with the upper and lower catch parts 4, 5, and by making the lower catch part 5 have a fork part that is inserted under the base U1 of the offshore wind turbine U, it is possible to install an offshore wind turbine U equipped with a base U1 that can be placed on a foundation F that is erected on the seabed at the installation site and has a protruding part F1 that protrudes out to sea.

In other words, the method for installing an offshore wind turbine may include the steps of: (i) inserting the support portion (e.g., the fork portion) of the lower catch part 5 (lower catch means) under the base U1 of the offshore wind turbine U (pre-assembled and installed on a support stand 8 on the coast) to hold the lower part of the offshore wind turbine U, while holding the upper part of the offshore wind turbine U with the upper catch part 4 (upper catch means) (see FIG. 8); (ii) towing the barge 2 while holding the upper and lower parts of the offshore wind turbine U to the installation site (see FIG. 9); (iii) placing the base U1 of the offshore wind turbine U on the protruding part F1 of the foundation F at the installation site and fixing the base U1 to the protruding part F1 (see FIG. 10); and (iv) releasing the holding by the upper and lower catch parts 4, 5 after the fixing, and moving the barge 2 away from the offshore wind turbine U. In this way, the offshore wind turbine U can be preassembled on land, then transported to the installation site and installed there, significantly reducing on-site work time.

In this case, it is not necessarily necessary to use an offshore wind turbine one-stop construction ship as described above as the barge, but the upper and lower catch means for holding the upper and lower parts of the offshore wind turbine U are not limited to the upper and lower catch parts 4, 5 described above, and can be anything that has left and right members and holds the upper and lower parts of the offshore wind turbine U by clamping them from both sides using the left and right members so that the upper and lower parts of the offshore wind turbine U can be easily held.

As described above, a preferred embodiment of the present invention has been described with reference to the drawings, but various additions, modifications, or deletions are possible without departing from the spirit of the present invention.

(i) In the above embodiment, the base U1 (widening portion) into which the fork portion of the lower catch portion 5 is inserted is rectangular plate-shaped, but is not particularly limited to a rectangular plate shape, and may be, for example, a disk-shaped base, as long as it protrudes from the outer periphery of the offshore wind turbine U and has a size and strength that allows the fork portion of the lower catch portion 5 to be inserted downward and support the entire weight of the offshore wind turbine from below. In addition, it does not need to be provided continuously around the entire circumference, but may be provided intermittently or partially, or may be a combination of such parts. It is also possible to remove it from the outer periphery of the offshore wind turbine U after installation. ,

(ii) In the above embodiment, shock absorbers 39 are provided between the left and right lower members 33L, 33R and the left and right upper members 34L, 34R to minimize the effects of sea conditions and to ensure a soft landing on the foundation F during installation. However, instead of shock absorbers 39, as shown in FIG. 11, it is also possible to provide a main hoisting pulley section 42 that can be raised and lowered to the jib by a hoisting rope 41, and provide a shock absorber 43 between the support body section 31 of the lower catch section 5A and the main hoisting pulley section 42.

(iii) As shown in Figures 12 to 14, the barge 2A can also be a semi-submersible vessel in which the waterline of the hull 2a can be adjusted in the vertical direction. In this case, when launching from the beach, as shown in Figure 12, the hull 2a is floated so that the waterline L is high to make it easier to remove the offshore wind turbine U, and during transportation, as shown in Figure 13, this state is maintained, and when installing, as shown in Figure 14, the hull 2a is submerged so that the waterline L is low to minimize the effects of sea conditions and make it easier to install the offshore wind turbine U.

F Foundation F1 Protruding part U Offshore wind turbine U1 Base U1
Reference Signs List 1 Offshore wind turbine integrated construction vessel 2, 2A Barge 3 Jib 4 Upper catch portion 5, 5A Lower catch portion 6 Suspension rope 7L, 7R Connection portion 8 Support base 9 Main winding pulley portion 10 Guide mechanism 11 Mounting base 12L, 12R Arm member 12La, 12Ra Convex portion 13L, 13R Catch opening/closing cylinder 14L, 14R Lower member 15L, 15R Upper member 16L, 16R Left-right position adjustment jack 17L, 17R Front-rear position adjustment jack 18 Front-rear position adjustment jack 19 Roller 20 Roller 21 Catch fixing jack 22 Connection means 31 Support main body portion 32L, 32R Support member 33L, 33R Lower member 34L, 34R Upper member 34La, 34Ra Convex portion 35L, 35R Left-right position adjustment jacks 36L, 36R Front-rear position adjustment jack 37 Roller 38 Motor (driving means)
39 Shock absorber 41 Suspension rope 42 Main winding pulley section 43 Shock absorber

Claims (13)

An offshore wind turbine one-stop construction ship that installs an offshore wind turbine on a foundation that is erected on the seabed at an installation site and has a protruding portion protruding out onto the ocean,
The offshore wind turbine is a completed form in which components including a tower, a nacelle, and a rotor are assembled, and a base that can be placed on the protruding portion of the foundation is provided protruding from a lower outer periphery,
With a barge,
A jib is provided on the hull of the barge and a portion of the jib protrudes outside the hull.
An upper catch portion that is provided on an upper portion of the jib and is capable of holding an upper portion of the offshore wind turbine;
a lower catch portion provided at a lower portion of the jib in correspondence with the upper catch portion and having a fork portion that supports a lower portion of the offshore wind turbine via the base;
Equipped with
When the offshore wind turbine is transported, outside the hull, the upper catch portion holds an upper portion of the offshore wind turbine, while the lower catch portion supports the entire weight of the offshore wind turbine with the lower catch portion by inserting the fork portion under the base, and holds a lower portion of the offshore wind turbine.
The upper catch portion is
An attachment base portion attached to the protruding portion of the jib and extending in the left-right direction;
Left and right arm members each having a base end portion attached to the mounting base so as to be horizontally rotatable;
left and right lower members provided on the arm members and movable in the left and right direction on the arm members;
left and right upper members provided on the lower member and movable in a front-rear direction on the lower member;
When the offshore wind turbine is transported, the upper portion of the offshore wind turbine is sandwiched between the left and right upper members to hold the upper portion of the offshore wind turbine.
This is an offshore wind turbine one-stop construction ship. the mounting base is provided between the left and right arm members, and a roller that comes into contact with an outer circumferential surface of the offshore wind turbine in a holding state of the offshore wind turbine is rotatably provided.
The offshore wind turbine integrated construction ship according to claim 1. the left and right upper members have convex portions having inner circumferential surfaces shaped to correspond to a shape of an outer circumferential surface of the offshore wind turbine, and a plurality of rollers or tires are rotatably provided on the inner circumferential surfaces and come into contact with the outer circumferential surface of the offshore wind turbine in a holding state of the offshore wind turbine.
The offshore wind turbine integrated construction ship according to claim 1. connecting means for connecting the left and right upper members in a state in which the offshore wind turbine is held, are provided at tip portions of the convex portions of the left and right upper members.
The offshore wind turbine integrated construction ship according to claim 1. The lower catch portion is
A support body portion that is provided so as to be liftable relative to the jib and extends in the left-right direction;
left and right support members each having a rear end connected to a left and right end of the support body and extending forward;
left and right lower members provided on the upper sides of the left and right support members and movable in the left and right direction;
left and right upper members provided above the left and right lower members and movable in the front-rear direction,
The fork portion includes the left and right support members, the left and right lower members, and the left and right upper members,
When the offshore wind turbine is transported, the left and right upper members sandwich a lower portion of the offshore wind turbine to hold the lower portion of the offshore wind turbine.
The offshore wind turbine integrated construction ship according to claim 1. the left and right upper members have convex portions having inner circumferential surfaces shaped to correspond to a shape of an outer circumferential surface of the offshore wind turbine, and a plurality of rollers or tires are rotatably provided on the inner circumferential surfaces by a driving means and rotatably contact the outer circumferential surface of the offshore wind turbine when the offshore wind turbine is in a held state.
The offshore wind turbine integrated construction ship according to claim 5. each of the left and right upper members has a convex portion having an inner circumferential surface having a shape corresponding to a shape of an outer circumferential surface of the offshore wind turbine, and a plurality of rollers are rotatably provided on the inner circumferential surface, the rollers contacting the outer circumferential surface of the offshore wind turbine in a holding state of the offshore wind turbine;
The offshore wind turbine integrated construction ship according to claim 5. The lower catch portion includes a shock absorber between the left and right lower members and the left and right upper members for absorbing a vertical impact.
The offshore wind turbine integrated construction ship according to claim 5. Further, a main hoisting pulley unit capable of ascending and descending is provided on the jib,
A shock absorber is provided between the main winding pulley part and the support body part of the lower catch part to absorb vertical impact.
The offshore wind turbine integrated construction ship according to claim 5. The barge is a semi-submersible vessel whose hull's waterline can be adjusted in the vertical direction.
The offshore wind turbine integrated construction ship according to claim 1. 1. A method for installing an offshore wind turbine, comprising the steps of: installing the offshore wind turbine on a foundation that is erected on the seabed at an installation site and has a protruding portion protruding out onto the ocean;
The offshore wind turbine is a completed form in which parts including a tower, a nacelle, and a rotor are assembled, and a base that can be placed on the protruding portion of the foundation is provided protruding from a lower outer periphery,
An upper catch portion and a lower catch portion are provided at a position where the jib protrudes outside the hull, so that the upper and lower parts of the offshore wind turbine can be held by the upper catch portion and the lower catch portion .
The upper catch portion has an attachment base portion attached to the protruding portion of the jib and extending in the left-right direction;
Left and right arm members each having a base end portion attached to the mounting base so as to be horizontally rotatable;
left and right lower members provided on the arm members and movable in the left and right direction on the arm members;
and left and right upper members provided on the lower member and movable in a front-rear direction on the lower member,
the lower catch portion has a fork portion that is inserted into a lower side of a base of the offshore wind turbine,
a step of inserting a fork portion of the lower catch portion under a base of the pre-assembled offshore wind turbine to hold a lower portion of the offshore wind turbine, while sandwiching an upper portion of the offshore wind turbine between the left and right upper members to hold the upper portion of the offshore wind turbine with the upper catch portion;
towing the barge while holding an upper and lower portion of the offshore wind turbine to the installation site;
placing a base of the offshore wind turbine on a protruding portion of the foundation at the installation site and fixing the base to the protruding portion;
a step of releasing the holding by the upper and lower catch parts after the fixing and moving the barge away from the offshore wind turbine;
A method for installing an offshore wind turbine, comprising: The lower catch portion is
A support body portion that is provided so as to be liftable relative to the jib and extends in the left-right direction;
left and right support members each having a rear end connected to a left and right end of the support body and extending forward;
left and right lower members provided on the upper sides of the left and right support members and movable in the left and right direction;
left and right upper members provided above the left and right lower members and movable in the front-rear direction,
The fork portion includes the left and right support members, the left and right lower members, and the left and right upper members,
When the offshore wind turbine is transported, the left and right upper members sandwich a lower portion of the offshore wind turbine to hold the lower portion of the offshore wind turbine.
The method for installing an offshore wind turbine according to claim 11. The offshore wind turbine is placed on a support stand installed on a coast before transportation so that the base is placed on the support stand,
The lower catch portion supports the entire weight of the offshore wind turbine from below by inserting the fork portion under the base on the support stand.
The method for installing an offshore wind turbine according to claim 11.

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