KR101793059B1 - All-in-one installation method of offshore wind turbine using the floating crane for installation of offshore wind turbine - Google Patents

Abstract

The present invention relates to an all-in-one installation method of an offshore wind turbine using an offshore crane for installation of a wind turbine. According to the present invention, the offshore wind turbine comprises: a barge with an embayment unit; two masts fixated on the barge to vertically stand; one or more arm units installed on the masts; and a lifting fork installed on the masts. According to the present invention, the method transports an offshore wind turbine, and performs an all-in-one installation of the offshore wind turbine on the sea. The present invention is able to remarkably reduce the time taken for assembly and combination on the sea, where the offshore wind turbine is to be installed, and to greatly reduce the installation time of the offshore wind turbine on the sea. When an offshore wind turbine is assembled on the sea, which is an installation point, and combined with a basic structure, a defect can occur in structural stability because of shaking due to waves. The present invention is able to remove the possibility of such structural defect by the all-in-one installation of the offshore wind turbine described above.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offshore wind turbine for offshore wind turbines,

More particularly, the present invention relates to a method of collectively installing offshore wind towers using a floating crane for installing a wind tower, and more particularly, to a method of collectively installing an offshore wind tower, The present invention relates to a method of collectively installing an offshore wind tower using a floating crane for installation of a wind tower capable of drastically reducing installation time at sea of an offshore wind tower and enhancing structural stability.

Generally, wind power generation is a renewable energy resource rich and constantly reproduced. It is distributed not only in a wide area but also as a clean energy source, and it does not emit greenhouse gas due to power generation. .

Wind power generation is classified as a distributed power supply in terms of system operation in that it generates electricity regardless of demand when the wind is blowing because it is developed using wind, which is natural energy.

Wind turbine systems are divided into mechanical systems, electrical systems, and control systems that control wind turbines. Also, it is divided into a hub system including a blade, a nutshell equipped with various machines, an electric and a control device, and a hub system at the upper part and a tower system for supporting the weight of the nun cell from the ground.

Wind turbines are divided into land and marine types depending on the installation location. In particular, offshore wind power generation enables the production of wind power by the construction of wind power generation complexes in water or on water. From the point of view of the sea, not only the sea, but also the inland areas such as lakes, . Moreover, the offshore wind power generation is more stable than the onshore wind turbine, has good wind speed, has few obstacles, noise and propagation obstacles, can be used for the transportation and installation of large-sized wind power generators, Since most of the area is located on the coast, there is an advantage in terms of transmission cost.

Conventionally, a wind turbine installed on the sea has been constructed on land, then loaded on a barge, towed to a tug to the installation area, and installed on a foundation structure installed on the sea using a crane line equipped with a large crane . In addition, major components of wind turbines are assembled and installed directly at sea. That is, it is necessary to assemble the wind tower of about 1 ~ 3 stages, the hub assembly, and the blade assembly at the same time or after assembling them one by one, and then lift it up by using a crane installed on a large crane line. The height of the boom is more important factor than the load capacity of the crane.

In addition, a suction file is often used as a basic structure of a wind turbine installed on the sea. A method of installing such a suction file will be briefly described below.

First, when the suction file is placed on the bottom of the water (for example, the undersurface), the bottom portion of the suction file is penetrated to the bottom of the water to a certain depth by the self weight of the suction file. In this state, when the water inside the file is drained to the outside by using a suction device such as a submersible pump installed at the upper end of the suction file, the pressure inside the suction file is reduced, so that there is a pressure difference between the inside and the outside of the suction file. At this time, the force is balanced in the horizontal direction in the structure of the suction file, but a downward pressing force is generated in the up and down direction, and the suction force is introduced into the ground by the generated force.

On the other hand, in order to efficiently develop the wind turbine, the height of the wind turbine is gradually increasing, and the length of the wind turbine is in the range of 80 ~ 130m. It is difficult to supply a crane with a large crane capable of lifting the wind turbine vertically. to be. Furthermore, installation of wind turbines at depths of sea will be subject to more constraints.

[0002] As a related art, Korean Patent Registration No. 10-1123257 (published on Mar. 20, 2012) discloses a method for constructing an offshore wind power generation structure, in which a main body 200 is manufactured by a pre- The main body 200 is integrally formed by stacking the upper body 200a and the lower body 200b and the upper body 200a is integrally formed with the upper ring 200a of the ring body 210. [ And a lower ring member 210b of the ring member 210 is installed on the lower main body 200b and the support member 300 is connected to the upper ring member 210a through an upper support member 300a And a lower support member 300b which is coupled to the lower ring member 210b. This is not only complicated in structure, but is also disadvantageous in terms of assembly and safety due to fluctuation due to waves or waves, which is caused by assembling the offshore wind power generation structure in the sea, and since the wind power generation facility is constructed by using a general crane, There is a problem that takes a long time.

Korean Registered Patent No. 10-1123257 (March 20, 2012 announcement): Construction method of offshore wind power generation structure

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a wind power tower and an offshore wind tower which are combined with a foundation structure for supporting an offshore wind tower and an offshore wind tower, Bulk installation of offshore wind towers using marine cranes for installation of wind towers, which can significantly reduce installation time in offshore wind turbine towers by drastically reducing assembly and coupling work time at sea, which is the installation point of offshore wind tower There is a purpose in providing a method.

It is another object of the present invention to provide a wind turbine tower capable of preventing the possibility that a structural failure of the offshore wind tower is caused by the blur due to the blur during assembly and connection, The present invention provides a method for collectively installing offshore wind towers using a floating crane for installation of a wind tower, which can be removed by installation work.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, Two masts fixed to the pants and rising vertically; And at least one arm portion provided on the mast, and a lifting fork installed on the mast, wherein the offshore wind tower is integral with the foundation and is installed in the sea in a lump.

Further, the present invention is characterized in that the horizontal displacement of an offshore wind tower, which is integral with a foundation located on the indentation, is controlled by locating two arm portions on the upper portion and one arm portion below the lifting fork, .

In addition, in the present invention, the arm portion is configured such that the first arm and the second arm are coupled to each of the two masts to rotate about one arm portion, and the first arm and the second arm are respectively coupled to the mast And a gripping member for directly gripping the horizontal bar and the offshore wind tower integrated with the foundation.

The inner ring of the bearing is fixedly coupled to the outer periphery of the mast, and the outer ring of the bearing is fixedly coupled to the inner periphery of the coupling member. The inner ring of the bearing is fixedly coupled to the inner periphery of the coupling member, Wherein a first gear is formed on the outer circumference of the hollow coupling member for rotation of the arm portion and a second gear engaged with the first gear is engaged with the first gear, Is installed.

Further, the present invention is characterized in that the lifting fork for lifting the offshore wind tower integrated with the foundation is constituted by a fork, a fingerboard and a fork support.

In the present invention, the fork is composed of two L-shaped parts and is coupled to the finger board. The fork surface is formed with pin grooves on which pin lugs protruding from the base structure are seated. In the lower part of the finger board, And is bent and extended so that its end is joined to the lower surface of the fork.

Further, the present invention is characterized in that a lift chain is built in the longitudinal grooves of each of the two masts, and the fingerboard is rigidly fixedly coupled to the lift chain using a connecting portion, and at both ends of each of the two mast longitudinal grooves, And the lift chain is engaged with the sprocket.

(A) When the bottom structure of the suction pile is penetrated to a certain depth on the seabed near the sidewall by the base structure and the suction pile, Coupling the lower end of the wind tower to the upper platform of the foundation structure using a land crane located at the seashore; (b) an offshore wind tower which is integral with the foundation, is located such that an offshore cranes are positioned such that the offshore cranes are integral with the foundation of the indentations, the tower being located between the first and second arms of the cranes and between the two forks, Wherein the pin lug is located above the pin groove of the fork and mooring using a mooring line to secure the floating crane; (c) raising the fork to move the offshore wind tower integrated with the foundation, collectively lifting the offshore wind tower integrally with the foundation; (d) The mooring line of the marine crane is loosened, the marine crane lifting the marine wind turbine tower integrated with the foundation is towed to the installation point of the marine wind turbine tower with the foundation, and then the marine cranes are re- Mooring using a line; (e) an offshore wind tower integrated with the foundation is installed on the seabed surface; and (f) unrolling the mooring line of the floating crane and traversing only the floating crane, And then collectively installs them in the sea.

As described above, the method of collectively installing offshore wind towers using the offshore cranes for installing wind turbine towers according to the present invention is characterized in that the foundation structures supporting the offshore wind towers and offshore wind towers near the port side of the harbor and the suction piles are combined, It is possible to drastically reduce the assembling and assembling operation time at the sea, which is the installation point of the offshore wind tower, thereby drastically reducing the installation time of the offshore wind tower in the sea.

In addition, the present invention relates to the possibility of the occurrence of defects in the structural stability due to the blur caused by assembling and assembling by assembling the offshore wind tower in the sea, which is the installation point of the offshore wind tower, There is an effect that can be removed by work.

1 is a perspective view showing a marine crane for installing a wind tower according to the present invention;
2 is a perspective view showing a main part of a pant over a marine crane for installing a wind tower according to the present invention;
3 is a partial detail view showing an embodiment of the portion A in Fig.
4 is a partial detail view showing another embodiment of the portion A in Fig.
FIG. 5 is a partial detail view showing an embodiment of a portion B in FIG. 2; FIG.
FIG. 6 is a partial detail view showing an embodiment of a portion C in FIG. 2; FIG.
FIG. 7 is a side view showing one embodiment of the portion C in FIG. 2; FIG.
FIG. 8 is a perspective view of a marine cranes for installing a wind tower according to the present invention when lifting an offshore wind tower integrated with a foundation; FIG.
9 is a plan view showing a marine cranes for installing a wind tower according to the present invention lifted up from an offshore wind tower which is integral with a foundation.
10A to 10F are views showing a method of collectively installing an offshore wind tower using a marine crane for installing a wind tower according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the appended drawings and foregoing description are intended for purposes of illustration only and are not intended to limit the scope of the present invention. .

2 is a perspective view showing a main portion of a pant over a marine crane for installing a wind tower according to the present invention, and Fig. 3 is a perspective view of a portion FIG. 4 is a partial detail view showing another embodiment of the portion A in FIG. 2, FIG. 5 is a partial detail view showing an embodiment of the portion B in FIG. 2, FIG. 7 is a side view showing one embodiment of the portion C in FIG. 2, and FIG. 8 is a side view of the marine crane for installing a wind tower according to the present invention, FIG. 9 is a plan view showing a marine crane for installing a wind tower according to the present invention lifted up from an offshore wind tower which is integral with a foundation, and FIG. 10 Figure 10f is a view showing how a method of installing offshore wind tower of a batch using a floating crane for mounting wind tower according to the invention.

As shown in FIGS. 1 and 2, the marine crane 10 of the present invention has two mast 12 fixed to a 'U' shaped barge 11 vertically A boom 13 is also fixed to the top of the pants 11 and the mast 12 to support the mast 12. [

Thus, the marine crane 10 of the present invention assembles the foundation structure 40 supporting the wind tower 30 and the wind tower and the suction pile 50 near the seam 20 of the port (hereinafter, (Hereinafter referred to as "the offshore wind turbine tower"), and has a structure for carrying it integrally and collectively installing the same on the sea. The width of the indentation 111 of the pants 11 where the offshore wind power tower 100 is integrated with the base of the movement of the offshore cranes 10 is set such that the offshore wind tower 100, 9, the wind power tower is omitted in FIG. 9, which is a plan view (see FIG. 9). In this case, since the suction file 50 is lifted up to the pants 11, has exist)

The two masts 12 are cylindrical and the mast 12 is provided with three arm portions 60 and 60 'and one lifting fork 70. The lifting fork 70, It is preferable that two arm portions 60 are provided on the upper portion and one arm portion 60 'is provided on the lower portion thereof, but the number of the arm portions 60 and 60' is not limited thereto.

The arm portions 60 and 60 'are lifted up to a lifting fork 70 or integrated with a base of the offshore wind tower 100, which is integral with the foundation, Is a device for controlling displacement. That is, the offshore wind tower 100, which is integral with the foundation of the offshore wind power tower 100 integrated with the foundation, is raised and fixed so as to prevent it from collapsing or tilting.

Therefore, the arm portions 60 and 60 'are constructed such that the offshore wind tower 100, which is integral with the foundation, grasps and holds the offshore wind tower 100, which is integral with the foundation, before and after the lifting fork 70 is driven, The first and second arms 61 and 61 'and the second arms 62 and 62' are connected to one arm portion 60 and 60 ', respectively. Must be coupled to each of the two masts 12 to be rotatable.

3 to 5, the first and second arms 61 and 61 'and the second arms 62 and 62' have hollow coupling members 63 and 63 ', respectively, which are directly coupled to the mast 12, (65, 65 ') for directly holding the horizontal bar (64, 64') and the offshore wind tower (100) integral with the foundation, and the gripping members (65, 65, A guide roller 66 may be provided to smoothly ascend and descend the integrated offshore wind tower 100 when the lifting fork 70 is driven. Here, the gripping members 65 and 65 'may be semicircular or' C 'shaped corresponding to the cross-sectional shape of the offshore wind tower 100 integrated with the foundation.

As shown in FIGS. 3 and 4, in the present invention, there are two methods of rotating the arm portions 60 and 60 ', manual or automatic.

In one embodiment, the hollow coupling members 63 and 63 'are installed on the outer periphery of the mast 12, and bearings are applied for rotation of the arm portions 60 and 60' The inner ring 632 of the bearing 631 is fixedly coupled to the outer periphery of the mast 12 and the outer ring 633 of the bearing 631 is fitted to the inner periphery of the mating member 63, 63 ' And the bearing 631 is divided into a circular ring-shaped inner ring 632 and an outer ring 633 and a bearing 633 is provided between the inner ring 632 and the outer ring 633, A radial ball bearing or a needle roller bearing 634 is applied as a bearing. The bearing 631 also includes a retainer (not shown) for supporting a ball or a needle roller between the inner ring 632 and the outer ring 633. That is, by rotating the first arm 61, 61 'and the second arm 62, 62' manually using the bearing 631, the gripping members 65, 65 'of the arm portions 60, 60' And the arm portions 60 and 60 'are fixed by the latches 67 so that the arm portions 60 and 60' are not rotated arbitrarily after they are gripped.

In another embodiment, a first gear 635 is formed on the outer periphery of the hollow coupling members 63 and 63 ', and a second gear 636 engaged with the first gear 635 When the second gear 636 is rotated by driving the motor, the engaging members 63 and 63 'engaged with the second gear 636 can be rotated, so that the gripping members 65 and 65' of the arm portions 60 and 60 ' Can grip or release the offshore wind tower 100, which is integral with the foundation. Here, the second gear 636 must be rotatable and fixed to the mast 12.

6 to 8, the lifting fork 70 is a device for directly lifting and lifting the offshore wind tower 100 integrated with the foundation. The lifting fork 70 includes a fork 71, A finger board 72 and a fork support 73.

The fork 71 is composed of two L-shaped portions and is coupled to the fingerboard 72 to support the offshore wind tower 100 integrated with the foundation. A pin groove 74 is formed on the surface of the fork 71 so as to receive a pin lug 41 protruding from the base structure 40. The pin lug 41 has a pair of cylindrical or semi- And the pin grooves 74 are formed in an arc shape or a " C " shape so as to correspond to the pin lugs 41. In order to lift the offshore wind tower 100 integral with the foundation, the width between the two L-shaped portions in the fork 71 is determined by considering the diameter of the foundation structure 40 at the position of the pin lug 41 It is preferable to attach a non-slip pad (not shown) to the pin groove 74 to prevent the pin lug 41 from slipping.

It is preferable that the position of the pin lug 41 is less than the center of gravity of the offshore wind tower 100 integrated with the foundation.

The pin lug 41 is fixed to the base structure 40 through the through hole formed in the base structure 40 or welded to the base structure 40 by welding the pin lugs 41 on both sides of the base structure 40, So that the offshore wind tower 100, which is seated on the pin groove 74 and integral with the foundation, can be raised and lowered. In the case where the pin lug 41 is fixed through the through hole formed in the foundation structure 40, the offshore wind tower 100 integrated with the foundation moves and can be used repeatedly after removing the pin lug 41 after completion of the installation .

The finger board 72 is a portion to which the fork 71 is engaged and the lift chain 75 is fixedly engaged. In the lower portion of the fingerboard 72, the fork support 73 is bent and extended, To support the load applied to the fork 71 together with the fork 71 by the offshore wind tower 100 integrated with the foundation. A load distributing wire 78 may also be provided on the upper surface of the fork 71 to distribute the load applied to the fork 71 and to support the fork 71 and the fork support 73 together.

The lift chain 75 is a device for lifting and lowering the offshore wind tower 100 integrated with the foundation supported on the fork 71 by lifting the fork 71 coupled with the fingerboard 72. The lift chain 75 is embedded in the longitudinal groove of each of the two masts 12 and the finger board 72 is connected to the lift chain 75 built in two mast 12 grooves The position at which the fingerboard 72 is fixedly coupled to the lift chain 75 should be the same height of the left and right lift chain 75 and the lifting fork 70 70, it is necessary to drive only one of the lift chains 75 to adjust the left and right horizontal positions.

The driving of the lift chain 75 is carried out in such a manner that a sprocket 77 is fixed to both ends of each of the longitudinal grooves of the two masts 12 and a lift chain 75 is engaged with the sprocket 77, It is possible to rotate the sprocket 77 with the same power device. Here, the number of the sprockets 77 may be added in accordance with the load of the offshore wind tower 100 integrated with the foundation, and the construction is not limited to the sprocket 77. [

Hereinafter, a method of collectively installing offshore wind towers using a marine crane for installing wind turbine towers according to the present invention will be described in more detail with reference to FIGS. 10A to 10F.

First, the foundation structure 40 supporting the wind tower 30 and the wind tower, and the suction pile 50 are assembled (the offshore wind tower integrated with the foundation) on the sea floor near the seawall 20 of the port, The assembled installation method is a method of assembling the foundation structure 40 coupled with the bottom end of the foundation structure 40 and the closed upper end portion of the suction pile 50 by using a land crane (not shown) When the suction file 50 is seated on the seabed surface, the lower end of the suction file 50 is penetrated to a certain depth on the seabed surface by the self weight of the combined base structure 40 and the suction file 50, To connect the lower end of the wind tower 30 to the upper platform 42 of the foundation structure 40 (Figure 10a)

In this case, when the offshore wind tower 100, which is integral with the foundation and is intruded on the sea floor, is tilted, it is connected to the closed top end of a plurality of suction pads 50 of tripod type A suction pump (not shown) of a suction pump may be used.

Next, the marine cranes 10 of the present invention are moved so that the marine wind tower 100 integrated with the foundation of the marine crane 10 is positioned at the indentation 111, where the marine wind tower 100, which is integral with the foundation, Should be located between the first arm 61, 61 'and the second arm 62, 62' of the arms 60, 60 'as well as between the two forks 71 and the pin lugs 41 should be located above the pin groove 74 of the fork 71. When the movement is completed, the mooring line 80 is moored to fix the floating crane 10 (Fig. 10B)

The above process (FIG. 10B) will be described in detail as follows.

In order to prevent horizontal displacement of the offshore wind tower 100 integrated with the foundation when the mooring of the floating crane 10 is completed near the mooring wall 20, The first arm 61 and the second arm 62 are rotated to grip the wind tower 30 with the holding member 65 of the arm portion 60. [ After the gripping, if necessary, the arm portion 60 may be fixed with a latch 67 so as not to arbitrarily rotate and spread. Here, the number of the arm portions 60 on the lifting fork 70 may be plural.

When the gripping of the wind tower 30 of the arm portion 60 at the upper portion of the lifting fork 70 is completed, the fork 71 is raised so that the pin lug 41 of the base structure 40 contacts the pin groove 74 of the fork 71 ).

When the pin lug 41 of the foundation structure 40 is seated in the pin groove 74 of the fork 71, the gripping member 65 'of the arm portion 61', which is below the lifting fork 70, The structure 40 is gripped. Here, the arm portions 60 and 60 'at the upper portion or the lower portion of the lifting fork 70 have the same structure, and the holding structure 65' of the arm portion 60 'at the lower portion of the lifting fork 70, The holding of the forklift 40 may be performed after the lifting of the fork 71, which will be described later, and the offshore wind tower 100 integrated with the foundation is lifted altogether.

Accordingly, the offshore wind tower integrated with the foundation when the lifting or transporting of the offshore wind tower integrated with the foundation is established and fixed by the above-mentioned process, so that it is not collapsed or tilted.

A process of positioning the offshore wind power tower 100 integrated with the foundation of the overhead crane and a series of processes of holding the wind tower 30 or the foundation structure 40 by the arm portions 60 and 60 ' It is preferable to perform at low sea level.

Next, the fork 71 is lifted up again to move the offshore wind power tower 100 integral with the foundation to collectively raise the offshore wind power tower 100 integrated with the foundation, When a pulling pump (not shown) connected to the closed upper end of the suction paddle 50 is operated, water is injected into the suction paddle 50, The suction pail 50 can be pulled out by applying a positive pressure. In addition, when the sea level rises and the high sea level becomes high during the low sea level, the sea crane 10 is subjected to a buoyant force. That is, it is preferable that the process of raising the offshore wind tower 100 integrally with the foundation is performed at the time of high tide at low tide (FIG. 10C)

Therefore, it is possible to lift up the offshore wind tower 100 integrated with the foundation, which is intruded on the bottom of the sea floor easily by the upward force of the fork 71 and the buoyancy force and the positive pressure by the pull pump.

Next, the marine cranes 10, which unfasten the mooring line 80 of the marine cranes 10 and lift up the marine wind tower 100 integrated with the foundation by using a tugboat, And then moored using a mooring line 80 to fix the floating crane 10 in the sea again (Figure 10d)

Next, the offshore wind turbine tower 100, which is integrated with the foundation in the reverse order to the process in which the offshore wind turbine tower 100 integrated with the foundation is placed on the indentation part 111 of the overhead crane 10, (Fig. 10E)

That is, the first arm 61 'and the second arm 62' of the arm portion 60 'located under the lifting fork 70 are rotated to move the gripping member 65' Thereby releasing the holding state of the foundation structure (40). The gripping member 65 'of the arm portion 60' at the lower portion of the lifting fork 70 is released from the holding state of the base structure 40 by the downward movement of the fork 71, (100) may be completed after the batch installation is completed.

When the gripping of the base structure 40 of the arm portion 60 'at the lower portion of the lifting fork 70 is completed, the fork 71 is lowered and the suction file 50 is intruded on the undersurface thereof, (Not shown) connected to the closed upper end portion of the suction paddle 50 causes the water in the suction paddle 50 to be drained to the outside so that the suction paddle 50 is moved to the design point . Thus, the offshore wind tower 100, which is integral with the foundation, is installed in a batch on the undersurface.

When the offshore wind power tower 100 integral with the foundation is completed to be installed on the undersurface in a lump, the holding state of the wind tower 30 by the holding member 65 of the arm portion 60 on the lifting fork 70 is released .

Finally, the mooring line 80 of the marine cranes 10 is again released and only the marine cranes 10 are towed using a tugboat. (Fig. 10f) At this time, the pin lugs 41 of the foundation structure 40 are pulled 71, only the fork 71 should be further lowered.

Therefore, according to the present invention, the foundation structure supporting the offshore wind tower and the offshore wind tower and the suction pile on the side of the harbor are combined, It is possible to greatly reduce installation time at sea of offshore wind tower by drastically reducing the time required for combined operation, and when the offshore wind tower is assembled at the installation site of the offshore wind turbine tower and installed in combination with the foundation structure, There is a possibility that defects may occur in the structural stability. The present invention is capable of eliminating the possibility of structural defects by the collective installation work of the above-mentioned offshore wind towers.

10: Marine Crane 11: Pants 12: Mast 13: Boom 20: Seal
30: Wind turbine tower 40: Foundation structure 41: Pin lug 42: Platform 50: Suction pile
60, 60 ': arm portion 61, 61': first arm 62, 62 ': second arm 63, 63'
64, 64 ': horizontal bar 65, 65': gripping member 66: guide roller 67:
70: lifting fork 71: fork 72: fingerboard 73: fork support 74: pinhole
75: Lift chain 76: Connection 77: Sprocket 78: Load distribution wire
80: Mooring line 100: Offshore wind tower integrated with a foundation 111:

Claims (12)

(a) The foundation structure 40 and the suction pile 50 are combined and placed on the seafloor near the seawall 20, and the suction pile 50 is seated by the self weight of the combined base structure 40 and the suction pile 50, The lower end of the wind tower 30 is coupled to the upper platform 42 of the foundation structure 40 using a land cranes located at the seam 20 when the lower end of the wind tower 30 is penetrated to a certain depth on the sea floor near the seam 20 step;
(b) a pants 11 having an indented portion 111 formed thereon, two masts 12 vertically fixed to the pants 11, at least one arm portion 60 provided at the mast 12, , And a lifting fork (70) installed on the mast (12) is moved such that an offshore wind tower (100) integral with the foundation of the floating cranes (10) The integrated offshore wind tower 100 is located between the first arm 61, 61 'and the second arm 62, 62' of the arm portions 60, 60 'and between the two forks 71, Wherein the pin lug (41) of the fork (40) is located above the pin groove (74) of the fork (71) and mooring using the mooring line (80) to secure the floating crane (10);
(c) raising the fork 71 to move the offshore wind power tower 100 integral with the foundation, collectively raising the offshore wind tower 100 integrated with the foundation;
(d) The mooring line 80 of the marine crane 10 is loosened and the marine cranes 10 lifting the marine wind power tower 100 integrated with the foundation are connected to the installation point of the marine wind power tower 100 integrated with the foundation Mooring using a mooring line (80) to re-secure the offshore cranes (10) in the sea after traction;
(e) a step of installing an offshore wind tower 100 integral with the foundation on the sea floor, and
(f) releasing the mooring line (80) of the overhead crane (10) again and traversing only the overhead crane (10), thereby transporting the offshore wind tower (100) Wherein the method comprises the steps of: (a) installing a plurality of offshore wind towers using a floating crane for installing a wind tower; The method according to claim 1,
The step (b)
The first arm 61 and the second arm 62 of the arm portion 60 on the upper portion of the lifting fork 70 are rotated to prevent horizontal displacement of the offshore wind tower 100, Grasping the wind tower (30) with the holding member (65) of the wind turbine (60);
Raising the fork 71 to cause the pin lug 41 of the base structure 40 to settle in the pin groove 74 of the fork 71,
And gripping the foundation structure (40) with the gripping member (65 ') of the arm portion (61') under the lifting fork (70). The method according to claim 1,
Wherein said step (b) is performed at low sea level,
In step (c), buoyant force is applied to the floating crane 10 at a time point when the sea level rises, and at a time when the sea level is changed from low to high. At the same time, And pulling out the suction file (50) by operating the wind turbine tower (50). The method according to claim 1,
The step (e)
The first arm 61 'and the second arm 62' of the arm portion 60 'at the lower portion of the lifting fork 70 are rotated so that the basic structure of the arm structure 60' (40) releasing the grip state;
The suction pump 50 is submerged in the bottom surface of the fork 71 while descending the fork 71 and the suction pump connected to the closed upper end portion of the suction file 50 is operated to allow the suction file 50 to penetrate to the design point, And installing the integrated offshore wind power tower 100 on the undersurface in a lump; and
And releasing the gripped state of the wind tower (30) by the gripping member (65) of the arm portion (60) at the upper portion of the lifting fork (70) .
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