JP5306863B2 - Transport method and work boat - Google Patents

Description

  The present invention relates to a transportation method and a work ship. More specifically, the present invention relates to a transport method and a work ship that reduce the swaying of a suspended load due to wind or waves on the ocean.

The construction work of offshore structures such as offshore wind power generation facilities is extremely difficult because it is greatly affected by waves and winds.
For this reason, various control methods have been devised to reduce the influence of waves and winds during construction work on the ocean. For example, in Patent Document 1, when a horizontal swing occurs in the suspension hook, the suspension hook swings at the tip of the stabilization arm by swinging and expanding or contracting the stabilization arm in the horizontal direction according to the degree of the swing. A control method for restraining the suspension of a suspension hook in a work ship is shown.

Japanese Patent Laid-Open No. 2002-20080

  The effects of waves and winds are created when carrying suspended loads to build offshore structures. Thereby, the operation rate of the transportation installation work on the ocean may fall. In addition, the vibration control mechanism such as the anti-swing arm of Patent Document 1 often has a complicated structure, and there is a problem that it is expensive.

  The present invention has been made in view of the above-described problems, and uses a simple structure to reduce the swaying of a suspended load due to waves or winds when transporting a suspended load on the ocean. The purpose is to provide a method for transporting suspended loads whose operating rate increases.

In order to achieve the above-mentioned object, a first invention is a method of transporting a suspended load by a work ship provided with a crane and an anti-swaying frame girder, wherein the suspended load is suspended from the crane and the anti-swaying is performed. One end of the anti-swaying frame girder is pivotally supported by a bracket installed on the work ship so as to be rotatable about the left-right direction of the hull of the work ship, In the transportation method, the anti-swaying frame girder can be rotated in the reverse direction with respect to the hull during rotation about the horizontal direction of the hull .

  With the above-described configuration, it is possible to provide a transportation method that horizontally supports a suspended load and reduces horizontal vibration of the suspended load due to wind or the like during transportation.

  A first hanging jig is attached to the upper part of the suspended load, and a second hanging jig is attached to the lower part of the suspended load, and the second hanging jig is removable from the anti-sway frame girder. The first suspension jig and the second suspension jig are suspended from the crane.

  With the above configuration, a vertically long load such as an offshore wind power generation facility can be transported while maintaining a vertical state. In addition, the second hanging jig can be detached from the anti-sway frame girder when installing a suspended load.

  The anti-sway frame girder has a horizontal truss structure.

  With the above configuration, an anti-sway frame girder that is difficult to buckle with a simple and lightweight structure can be obtained.

  In addition, one end of the anti-sway frame girder is pivotally supported by a bracket installed on the work ship so as to be rotatable about the left-right direction of the hull of the work ship.

The left and right direction of the hull is a direction orthogonal to the axis connecting the bow and stern of the hull.
With the configuration described above, the vertical swing of the suspended load caused by the rotation of the hull due to waves or the like can be absorbed by the rotation of the anti-sway frame girder.

In order to achieve the above-described object, a second invention includes a crane for hanging a suspended load, and an anti-sway frame girder for supporting the suspended load in a horizontal direction, and one end of the anti-sway frame girder. Is supported on a bracket provided on the work boat so as to be rotatable about the left-right direction of the hull of the work boat, and the anti-sway frame girder is rotated when the left-right direction of the hull is used as an axis. It is a work ship characterized by being able to rotate in the reverse direction .

In addition, a first hanging jig attached to the upper part of the suspended load and a second hanging jig attached to the lower part of the suspended load are suspended from the crane, and the second hanging jig is Removably connected to the anti-sway frame girder. The anti-sway frame girder has a horizontal truss structure .

  According to the present invention, it is possible to provide a transportation method or the like that uses a simple structure to reduce the swaying of a suspended load due to waves, winds, or the like during transportation and to increase the operating rate of suspended loads on the ocean.

Side view showing an example of the transport state of the offshore wind power generation facility 9 The perspective view which shows an example of the conveyance state of the offshore wind power generation equipment 9 Top view of the anti-sway frame girder 25 as seen from above

Hereinafter, an embodiment of a transport method and a work boat according to the present invention will be described with reference to FIGS. 1, 2, and 3.
In this description, an offshore wind power generation facility is used as an example of a suspended load that is transported. The offshore wind power generation facility will be described later.
FIG. 1 is a side view showing an example of the transport state of the offshore wind power generation facility 9.
FIG. 2 is a perspective view showing an example of the transport state of the offshore wind power generation facility 9.
FIG. 3 is a plan view of the anti-swaying frame girder 25 as viewed from above.

  On the hull 3 of the work boat 1, an operation room and the like are installed in addition to the crane 11, the crane support portion 13, the anti-sway frame girder 25, and the bracket 27. In the hull 3 in FIG. 1, the right side is the bow side and the left side is the stern side.

The crane 11 includes a jib 14, a wire 17, a suspending portion 19, and the like, and is provided on the hull 3 so as to extend from the hull 3 in the forward forward direction. The wire 17 connects the hanging part 19 and the tip of the jib 14, and can lift the hanging part 19 from the tip of the crane 11. The suspending portion 19 is for suspending the offshore wind power generation equipment 9 in front of the bow of the hull 3 via a wire 18, a first suspending jig 20, a second suspending jig 21 and the like which will be described later.
The crane support 13 is provided at the stern of the hull 3 and supports the tip of the jib 14 of the crane 11 from the stern of the hull 3 with a wire 15 extending from the upper part.

The offshore wind power generation facility 9 is an upper facility of the offshore wind power generation facility, and the offshore wind power generation facility is constructed by installing the offshore wind power generation facility 9 on a foundation provided on the ocean.
The offshore wind power generation facility 9 includes a blade 31, a rotating unit 33, a windmill tower 35, and the like. The windmill tower 35 has a cylindrical shape, and has a flange 24 projecting in the radial direction of the windmill tower 35 at a lower portion thereof.

As shown in FIG. 2, the first suspension jig 20 is attached so as to extend horizontally from the center of gravity of the upper part of the offshore wind power generation facility 9 in the horizontal direction. The wire 18 suspended from the suspension part 19 is attached to the end part.
The second suspension jig 21 is attached to the lower part of the offshore wind power generation facility 9. The second hanging jig 21 has a substantially circular base 22 having a hole in the center, and a substantially triangular flange receiver 23 attached to the base 22 so that the bottom is in contact with the radial direction of the base 22. By inserting the wind turbine tower 35 of the offshore wind power generation facility 9 through the hole of the base 22 and supporting the flange 24 attached to the lower part of the wind turbine tower 35 of the offshore wind power generation facility 9 from below with the flange receiver 23, the second The suspension jig 21 supports the lower part of the offshore power generation facility 9.

The wire 18 suspended from the suspension part 19 extends further downward from the position of the first suspension jig 20 and is also attached to the second suspension jig 21. That is, the offshore wind power generation facility 9 is suspended from the tip of the crane 11 by the suspension portion 19, the wires 17, 18, and the like via the first suspension jig 20 and the second suspension jig 21.
The second suspension jig 21 is detachably connected to one end of the anti-sway frame girder 25. When installing on the foundation of the offshore wind power generation equipment 9, the second suspension jig 21 is removed from the anti-sway frame girder 25.

As shown in FIG. 3, the anti-swaying frame girder 25 has a horizontal truss structure including a pair of beam members 39 arranged on the left and right sides and a diagonal member 41 that diagonally connects the beam members 39.
The anti-swaying frame girder 25 extends in the horizontal direction from the bow of the hull 3 to the front of the bow and is detachably connected to the second suspension jig 21 attached to the lower part of the offshore wind power generation facility 9 at its end. The offshore wind power generation facility 9 is supported in the horizontal direction.
The end of the anti-swaying frame girder 25 on the hull 3 side is pivotally supported by a bracket 27 provided on a mounting base 37 of the bow of the hull 3, and can rotate around a horizontal axis 29 of the hull 3. is there.

When the hull 3 rotates about the horizontal direction of the hull 3 due to waves or the like, the anti-sway frame girder 25 rotates with respect to the hull 3 in the opposite direction, and the offshore wind power generation equipment 9 swings in the vertical direction as the hull 3 rotates. Can be reduced.
However, for reasons such as preventing drafting of the offshore wind power generation facility 9 during normal transportation, it is desirable that the rotation of the anti-sway frame girder 25 be within a certain range. A predetermined rotational resistance such as a frictional force is introduced into the rotation.

The offshore wind power generation equipment 9 that is a suspended load is transported while maintaining the above state.
The anti-swaying frame girder 25 provided on the work boat 1 is connected to the second suspension jig 21 attached to the lower part of the offshore wind power generation facility 9 as a suspended load so as to support the offshore wind power generation facility 9 in the horizontal direction. Therefore, the horizontal shaking of the offshore wind power generation facility 9 due to wind or the like can be reduced.
Furthermore, since the first suspension jig 20 and the second suspension jig 21 attached to the upper and lower parts of the offshore wind power generation facility 9 are suspended from the crane 11 provided in the work boat 1, At the time of transportation, the offshore wind power generation facility 9 which is a vertically long suspended load can be kept in a vertical state.
In addition, the anti-swaying frame girder 25 is pivotally supported at one end on the side of the hull 3 by a bracket 27 provided on the bow of the hull 3 and can rotate within a certain range about the left-right axis 29 of the hull 3. Thus, it is possible to reduce the vertical shaking of the offshore wind power generation facility 9 due to the rotation of the hull 3 about the horizontal direction due to waves or the like.
Further, the anti-swaying frame girder 25 has a horizontal truss structure, and has a simple and lightweight structure that is difficult to buckle.

  As described above, according to the present embodiment, a simple structure is used to reduce the swaying of a suspended load caused by wind or waves during transportation, and to provide a transportation method that improves the operating rate of transportation work on the ocean. can do.

The preferred embodiments of the transport method and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.
For example, in the present embodiment, the example of transporting an offshore wind power generation facility as a suspended load has been described, but the above-described transport method is also applied when transporting a vertically long suspended load such as a steel pipe. Is possible.
Further, depending on the shape of the suspended load or the like, such as not having a vertically long shape, there is a case where it is not particularly necessary to maintain a vertical state during transportation. In this case, it is not necessary to use the first lifting jig described above when transporting the suspended load. If the suspended load is directly suspended from the upper part and supported horizontally by the anti-sway frame girder, the object of the present invention is Reachable. Further, the suspended load and the anti-sway frame girder can be directly connected, and in this case, the second hanging jig is not necessary.

1 ……… Working vessel 3 ……… Hull 5 ……… Water surface 7 ……… Bottom 9 ……… Offshore wind power generation equipment (suspended load)
11 ......... Crane 13 ......... Crane support 14 ......... Jibs 15, 17, 18 ......... Wire 19 ......... Suspension 20 ...... First suspension jig 21 ......... Second suspension Jig 25 ......... Anti-motion frame girder 27 ......... Bracket 29 ......... Axis

Claims (6)

A method for transporting a suspended load by a work ship provided with a crane and an anti-sway frame girder,
The suspended load is suspended from the crane and transported while being supported in the horizontal direction by the anti-sway frame girder ,
One end of the anti-sway frame girder is pivotally supported on a bracket installed on the work boat so as to be rotatable about the left-right direction of the hull of the work boat, and when rotating about the left-right direction of the hull, A transportation method, wherein the anti-sway frame girder is rotatable in the reverse direction with respect to the hull . A first hanging jig is attached to the upper part of the suspended load, and a second hanging jig is attached to the lower part of the suspended load,
The second suspension jig is detachably coupled to the anti-sway frame girder,
The transport method according to claim 1, wherein the first suspension jig and the second suspension jig are suspended from the crane.   The transport method according to claim 1, wherein the anti-sway frame girder is configured by a horizontal truss structure. A crane for hanging suspended loads,
An anti-sway frame girder for horizontally supporting the suspended load;
A work boat comprising:
One end of the anti-sway frame girder is pivotally supported on a bracket provided on the work boat so as to be rotatable about the left-right direction of the hull of the work boat, and when rotating about the left-right direction of the hull, A work ship characterized in that the anti-sway frame girder is rotatable in the opposite direction with respect to the hull . A first hanging jig attached to the upper part of the suspended load and a second hanging jig attached to the lower part of the suspended load are suspended from the crane,
The work ship according to claim 4, wherein the second suspension jig is detachably connected to the anti-sway frame girder. The work ship according to claim 4 or 5, wherein the anti-sway frame girder is configured by a horizontal truss structure.

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