JP6460894B2 - Cable drawing structure, cable drawing method, sheath tube unit - Google Patents

Description

  The present invention relates to a cable drawing structure for drawing a cable and the like.

  In offshore wind power generation equipment, a transition piece is attached to the upper part of a steel pipe pile or the like placed on the ground of the ocean, and wind power generation equipment such as a windmill is provided thereon. A cable for power transmission / communication is connected to the wind power generation facility, but since a submarine cable is used in a place away from the land, it is necessary to draw in this cable and connect it to the wind power generation facility above. The cable was stretched from the sea floor to the wind power generation facility along the steel pipe pile.

  The main cause of damage to submarine cables is anchoring of ships and catching with fishing gear during fishing, so cables are usually buried or covered on the seabed. However, around the steel pipe piles of offshore wind power generation facilities, scouring phenomena occur due to waves (waves, swells), long-period waves (storm surges, tsunamis, etc.), and currents (ocean currents, tidal currents). There is a concern that the cable may become free span.

  If the cable becomes free span, it will be repeatedly deformed by the waves, resulting in cable wear damage and fatigue breakage, impairing the function of offshore wind power generation. Therefore, in Patent Document 1, it is described that cables are arranged in a tunnel constructed under the sea bottom.

Japanese Unexamined Patent Publication No. 2014-15935

  However, the method disclosed in Patent Document 1 is large-scale, is difficult to construct, and expensive, and there is a need for a method that can prevent a cable from being free spanned with a simpler structure.

  An object of the present invention is to provide a simple cable lead-in structure and the like that can prevent a free span of a cable when scouring occurs.

1st invention for solving the subject mentioned above is a cable drawing structure which draws a cable in the inside of the cylindrical structure arrange | positioned at the ground of a water bottom, Comprising: The said cylindrical structure has a hole in a side surface. A sheath tube attached to the side surface of the cylindrical structure so as to be rotatable in a vertical plane about the lower portion is tilted toward the bottom of the water, and a cable extends from the hole through the tilted sheath tube. Pulled into the inside of the tubular structure, the sheath tube has rigidity, a flexible portion is provided in the middle, and the flexible portion of the tilted sheath tube is separated from the tubular structure and the tubular structure a cable entry structure characterized that you located outside the object.

  In the present invention, since the sheath pipe attached to the side surface of the tubular structure is tilted and the cable is drawn into the tubular structure through the sheath pipe, the cable is held by the sheath pipe around the tubular structure. As a result, a simple structure can prevent the cable from becoming free span when scouring occurs, and it can be safely constructed at low cost.

It is desirable that the lower end portion of the sheath tube is inserted into the cylindrical structure from the hole by tilting the sheath tube toward the water bottom. Moreover, it is desirable that the lower end portion of the sheath tube is bent in an arc shape.
By inserting the lower end of the sheath tube into the inside of the tubular structure from the hole of the tubular structure, the cable can be suitably protected without exposing it to the outside, and the lower end of the sheath tube is made arcuate. Even if the hole of the cylindrical structure is small, the lower end portion of the sheath tube can be suitably inserted when the sheath tube is rotated.

It is desirable that a guide in a vertical direction is provided on a side surface of the cylindrical structure, and the sheath tube is attached to a slider that can slide along the guide. For example, the guide is a tubular body having a slit, and the slider is H-shaped steel.
Thereby, a sheath pipe can be retrofitted to a cylindrical structure and does not hinder the construction of the cylindrical structure. Moreover, it can be set as a simple and low-cost structure by using a tubular body with a slit and H-shaped steel.

It is desirable that an inner tube is provided inside the cylindrical structure so as to be continuous with the hole.
The inner tube can protect the cable inside the cylindrical structure.

It is desirable that the tubular structure has a plurality of the holes along the vertical direction.
Thereby, a suitable hole can be selected according to the error of the height position of a cylindrical structure, and it can use for cable drawing.

In the first aspect of the invention, the sheath tube is more and this with a flexible portion, it is possible to bend the portion of the sleeve pipe, buried, etc. of the cable is facilitated.

Moreover, it is desirable that the cylindrical structure is a steel pipe pile placed on the ground, and the position of the hole through which the cable is passed is higher than the maximum scouring depth from the bottom of the water.
Thereby, this invention can be applied suitably with respect to the steel pipe pile used for the foundation etc. of an offshore wind power generation equipment, and it can prevent the influence of scouring reaching a cable easily and at low cost.

The sheath pipe is preferably covered with a scouring prevention material.
While preventing scouring of the ground by the scouring prevention material, the sheath pipe can be suitably protected.

2nd invention is a cable drawing method which draws a cable in the inside of the cylindrical structure arrange | positioned on the ground of a water bottom, Comprising: The sheath pipe attached to the side surface of the said cylindrical structure is perpendicular | vertical centering on the lower part. A step of rotating in a plane and tilting toward the bottom of the water, and a step of drawing a cable from the side hole of the cylindrical structure into the cylindrical structure through the tilted sheath tube. The sheath tube has rigidity, and a flexible portion is provided in the middle. When the sheath tube is tilted, the flexible portion is separated from the tubular structure and outside the tubular structure. It is the cable drawing-in method characterized by being located.
In addition, a vertical guide may be provided on a side surface of the cylindrical structure, and the sheath pipe may be attached to the cylindrical structure by sliding a slider with the sheath pipe attached along the guide. desirable.

Further, when the cable is drawn into the cylindrical structure, the cable is connected to a rope that has gone out from the inside of the cylindrical structure through the sheath tube, and the cable is pulled by pulling the rope. It is desirable to draw into the cylindrical structure. For example, a part of the rope is inserted into the sheath tube in advance, and both ends thereof are temporarily fixed inside the sheath tube, and one end of the rope is placed outside the sheath tube during cable drawing work. Extend and use for pulling in the cable.
Thereby, a cable can be drawn in easily.

A third invention is a sheath tube unit that is attached to a cylindrical structure disposed on the ground of the water bottom, and is a slider that is slidable along a sheath tube and a vertical guide provided on a side surface of the tubular structure. The sheath tube is attached to the slider so as to be rotatable in a vertical plane about the lower portion as a center , the sheath tube has rigidity, and a flexible portion is provided in the middle thereof. The portion is a sheath tube unit provided on the upper portion of the sheath tube.

  According to the present invention, it is possible to provide a simple cable lead-in structure or the like that can prevent a free span of a cable when scouring occurs.

Diagram showing offshore wind power generation facility 1 The figure explaining the cable drawing-in method of 1st Embodiment The figure shown about attachment of sheath pipe 20 The figure explaining the cable drawing-in method of 1st Embodiment The figure which shows the inner tube | pipe 113, the hole 111, and the long hole 111a The figure which shows the example of attachment of the sheath pipe 20 The figure explaining the cable drawing-in method of 2nd Embodiment The figure explaining the cable drawing-in method of 2nd Embodiment The figure explaining the cable drawing-in method of 2nd Embodiment The figure which shows the asphalt mat 106 The figure explaining the example of another cable drawing-in method The figure explaining another example of this invention The figure explaining another example of this invention The figure explaining another example of this invention

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

[First embodiment]
(1. Offshore wind power generation facilities)
FIG. 1 is a diagram showing an offshore wind power generation facility 1 having a cable lead-in structure 2 according to a first embodiment of the present invention. Fig.1 (a) is a figure which shows schematic structure of the offshore wind power generation equipment 1, FIG.1 (b) looks at the cross section of the horizontal direction along line AA of Fig.1 (a).

  As shown in FIG. 1, the offshore wind power generation facility 1 includes a steel pipe pile 11, a transition piece 12, and a wind power generation facility 13.

  The steel pipe pile 11 is a cylindrical structure disposed on the ground 100 at the bottom of the water, and is placed in the ground 100 so that the lower part is embedded in the ground 100. The ground 100 around the steel pipe pile 11 is provided with a crushed stone 101 as a scouring preventive material, and further backed up with sand 102 as a backfill material.

  The transition piece 12 is a cylindrical member that is fitted on the upper portion of the steel pipe pile 11, whereby the inclination of the steel pipe pile 11 is corrected and verticality is ensured. Grout or the like (not shown) is filled between the upper side surface of the steel pipe pile 11 and the inner surface of the transition piece 12. However, in some cases, the transition piece 12 is omitted.

  The wind power generation facility 13 is provided on the water surface above the transition piece 12. The wind power generation facility 13 includes a windmill and various facilities for power generation. A cable 22 for power transmission / communication is connected to the wind power generation facility 13.

  The cable lead-in structure 2 of the present embodiment draws the cable 22 into the steel pipe pile 11 through the sheath pipe 20. The cable 22 passes through the inside of the steel pipe pile 11 and is connected to the upper wind power generation facility 13.

  The sheath tube 20 is a tube formed of metal or the like and has sufficient rigidity. The sheath pipe 20 is attached to the side surface of the steel pipe pile 11 so as to be rotatable in a vertical plane with the lower portion as a substantial center, and is tilted toward the bottom of the water when the cable is pulled in. This will be described later. As shown in FIG. 1B, in the present embodiment, two cables 22 are drawn into the steel pipe pile 11 with the same configuration using the two sheath tubes 20, but thereafter, one sheath tube 20 is used. Shall be explained.

(2. Cable drawing method)
Next, with reference to FIG. 2 etc., the cable drawing method which concerns on this embodiment is demonstrated with the construction procedure of the offshore wind power generation equipment 1. FIG.

  When constructing the offshore wind power generation facility 1, in this embodiment, first, the bottom 100 of the bottom is excavated as shown in FIG. 2A, and the steel pipe pile 11 is connected to the ground 100 as shown in FIG. Place in the excavation area. Thereafter, the sheath pipe 20 is attached along the steel pipe pile 11.

  FIG. 3 is a view showing attachment of the sheath tube 20. FIG. 3A is a view showing a method for attaching the sheath tube 20. 3 (b) to 3 (d) are views showing the attachment state of the sheath tube 20, FIG. 3 (b) is a view of the sheath tube 20 as viewed from the front, and FIG. FIG. 3D is a side view taken along the line BB in FIG. 3B.

  As shown in FIG. 3A, a pair of right and left guide pipes 110 are provided on the side surface of the steel pipe pile 11 as a guide for mounting the sheath pipe 20. The guide tube 110 is a tube with a slit. The slit 110a is provided along the vertical direction from the top end of the guide tube 110 and reaches a position at a predetermined height from the bottom end of the guide tube 110.

  On the other hand, the sheath tube 20 is attached to and integrated with a pair of left and right H-shaped steels 21 (sliders), thereby forming a sheath tube unit.

  That is, the girders 211 and 212 (see FIG. 3C) are provided on one flange of the H-section steel 21 so as to bridge between the two H-section steels 21. The girders 211 and 212 are provided on the upper and lower parts of the H-section steel 21, respectively. Girder members 201 and 202 are also provided at the upper and lower portions of the sheath tube 20, and the spar members of the sheath tube 20 and the H-shaped steel 21 are in positions corresponding to both the upper and lower portions. The lower beam member 212 of the H-shaped steel 21 and the lower beam member 202 of the sheath tube 20 are rotatably connected by a hinge pin 220.

  When the sheath tube 20 is attached, the sheath tube unit composed of the sheath tube 20 and the H-shaped steel 21 is lowered as shown by the arrow in FIG. 3A, and the pair of H-shaped steels 21 are inserted into the guide tubes 110, respectively. And slide it down. At this time, the web of the H-shaped steel 21 is passed through the slit 110 a of the guide tube 110, and the other flange of the H-shaped steel 21 (the flange not provided with the girders 211 and 212) is inserted into the guide tube 110. .

  When the H-section steel 21 is slid downward, the bottom end of the H-section steel 21 comes into contact with the bottom end of the slit 110a, whereby the height position of the sheath tube 20 is determined. Thus, as shown in FIGS. 3B to 3D, the sheath pipe 20 is attached in the vertical direction along the steel pipe pile 11.

  A flexible portion 206 is provided in the middle of the upper portion of the sheath tube 20, and the upper end portion of the sheath tube 20 is supported from above by a wire 23 or the like attached to the beam member 201.

  Further, the lower end portion of the sheath pipe 20 is bent in an arc shape toward the steel pipe pile 11 side, and a hole 111 is provided in the steel pipe pile 11 near the tip thereof. The periphery of the hole 111 is reinforced with a ring-shaped reinforcing material 112. In order to prevent earth and sand from flowing into the steel pipe pile 11 from the hole 111, an inflow prevention material such as a seal brush may be attached to the hole 111.

  When placing the steel pipe pile 11 (see FIG. 2B), the position of the hole 111 does not have to be so deep, and is higher than the maximum scouring depth from the water bottom (the upper surface of the sand 102) shown in FIG. And what is necessary is just to be located below the transition piece 12. FIG.

  Returning to the description of FIG. In this embodiment, after placing the steel pipe pile 11 as shown in FIG. 2 (b), the wire 23 is unwound and the sheath is centered on the hinge pin 220 (see FIG. 3 (c)) near the lower portion of the sheath pipe 20. The tube 20 is rotated in the vertical plane and tilted toward the bottom of the water. Thereby, the sheath tube 20 is arrange | positioned along the excavation part of the ground 100, as shown in FIG.2 (c). The wire 23 is removed and recovered after the sheath tube 20 is rotated.

  Subsequently, as shown in FIG. 2 (d), the crushed stone 101, which is a scouring prevention material, is arranged in the excavation part of the ground 100 and the top is backfilled with sand 102. The sheath tube 20 is covered with crushed stone 101 or the like.

  FIG. 4A is a diagram showing this state. In this embodiment, when the sheath tube 20 is rotated and tilted toward the water bottom, the arc-shaped lower end portion is inserted into the steel pipe pile 11 through the hole 111. Is done. By appropriately determining the curvature of the arc, the lower end can be suitably inserted when the sheath tube 20 is rotated even if the hole 111 is small.

  Moreover, the front-end | tip of the cable 22 is attached to the rope 30 which went out through the sheath pipe 20 from the inside of the steel pipe pile 11. FIG. When this rope 30 is pulled from the steel pipe pile 11 side, as shown in FIG. 2 (e), the cable 22 passes through the sheath pipe 20 and is drawn into the steel pipe pile 11 from the hole 111 and pulled upward. In addition, the transition piece 12 and the wind power generation facility 13 are installed, and the cable 22 is connected to the wind power generation facility 13. In addition, a part of the rope 30 is inserted into the sheath tube 20 in advance, and both ends thereof are temporarily fixed inside the sheath tube 20, and one end of the rope 30 is placed outside the sheath tube 20 during the cable drawing operation. By extending the cable 22 for use, the cable 22 can be easily drawn.

  Next, as shown in FIG. 2 (f), the cable 22 outside the sheath tube 20 is buried under the water bottom. Here, as shown in FIG. 4B, the cable 22 outside the sheath tube 20 is buried under the water bottom by a cable burying machine (not shown) using a jet or the like. At this time, the flexible portion 206 of the sheath tube 20 is bent so that the cable 22 can be easily embedded. As described above, the cable lead-in structure 2 for drawing the cable 22 into the steel pipe pile 11 through the sheath pipe 20 is formed.

  As described above, according to the present embodiment, the sheath pipe 20 attached to the side surface of the steel pipe pile 11 is tilted, and the cable 22 is drawn into the steel pipe pile 11 through the sheath pipe 20. Then, the cable 22 is held by the sheath tube 20, so that the free span of the cable 22 at the time of scouring can be prevented with a simple structure, and the cable 22 can be safely constructed at low cost.

  When the sheath pipe 20 is rotated, the lower end portion of the sheath pipe 20 is inserted into the steel pipe pile 11 from the hole 111 of the steel pipe pile 11, so that the cable 22 can be suitably protected without being exposed to the outside. Moreover, even if the hole 111 of the steel pipe pile 11 is small by making the lower end part of the sheath pipe 20 into an arc shape, the lower end part of the sheath pipe 20 can be suitably inserted when the sheath pipe 20 is rotated.

  Further, a guide pipe 110 with a slit is provided on the side surface of the steel pipe pile 11, and the sheath pipe 20 is attached to the H-shaped steel 21 to be unitized. Therefore, the H-shaped steel 21 is slid along the guide pipe 110 to form a sheath. The pipe 20 can be retrofitted to the steel pipe pile 11. Thereby, the sheath pipe 20 does not become a hindrance at the time of placing the steel pipe pile 11, and it becomes a simple and low-cost configuration.

  Further, the cable 22 can be easily drawn into the steel pipe pile 11 using the rope 30 as described above. Furthermore, since the sheath tube 20 has the flexible part 206, it becomes easy to bend a part of the sheath tube 20 and to embed the cable 22 under the water bottom.

  However, the present invention is not limited to this. For example, as shown in FIG. 5A, a J-shaped inner pipe 113 may be provided in the steel pipe pile 11 so as to extend upward continuously from the hole 111. The inner pipe 113 can protect the cable 22 in the steel pipe pile 11 where seawater or the like exists.

  Further, as shown in FIG. 5B, a plurality of holes 111 may be provided along the vertical direction. Thereby, even if an error fits in the placement depth of the steel pipe pile 11, that is, the height position of the steel pipe pile 11, an appropriate hole 111 can be selected and used for cable drawing. In order to insert the sheath tube 20 into the target hole 111, the length of the lower portion of the beam 212 of the H-shaped steel 21 (see FIG. 3C) is adjusted, and the bottom end of the H-shaped steel 21 is the guide tube. It is possible to adjust the height position of the sheath tube 20 when it contacts the bottom end of the slit 110. Further, as shown in FIG. 5C, a long hole 111a in the vertical direction may be provided.

  Moreover, although the sheath pipe 20 was retrofitted to the steel pipe pile 11 in this embodiment, you may attach the sheath pipe 20 to the steel pipe pile 11 previously. FIG. 6 shows this example. A bar 207 provided at the lower portion of the sheath pipe 20 and a bracket 114 provided on the steel pipe pile 11 are rotatably connected by a pin 115.

  Next, a second embodiment of the present invention will be described. The second embodiment will mainly describe differences from the first embodiment, and the same points will be denoted by the same reference numerals in the drawings and the like, and detailed description thereof will be omitted.

[Second Embodiment]
With reference to FIG. 7 etc., the cable drawing method which concerns on the 2nd Embodiment of this invention is demonstrated with the construction | assembly procedure of the offshore wind power generation equipment 1. FIG.

  As shown in FIG. 7A, in this embodiment, the steel pipe pile 11 is driven on the ground 100 without excavating the ground 100. The hole 111 of the steel pipe pile 11 is on the water bottom. Thereafter, the sheath pipe 20 is attached to the steel pipe pile 11 as in the first embodiment.

  Thereafter, the sheath tube 20 is rotated and tilted toward the bottom of the water in the same manner as in the first embodiment, and the sheath tube 20 is disposed on the bottom surface of the water as shown in FIG. FIG. 8A shows this state. In the present embodiment, in addition to the configuration of the sheath tube 20 described in the first embodiment, an anchor 205 is provided on the upper portion of the sheath tube 20, and the sheath tube 20 is firmly fixed to the water bottom surface by the anchor 205. It has become so.

  In place of the anchor 205 or in combination with the anchor 205, both ends of the gate-shaped fixing portion 40 are inserted into the bottom 100 of the bottom as shown in FIG. 8B, and the sheath tube 20 is fixed inside thereof. May be. In addition, when the sheath tube 20 has a long span, as shown in FIG. 8C, a support member 50 that supports the sheath tube 20 with a truss structure or the like can be provided from each of a pair of rods. It is. It is also possible to lay a net-like hardware or the like in advance on the bottom surface of the water, and fix the metal fitting by tying the sheath tube 20 to the hardware.

  Returning to the description of FIG. On the water bottom, as shown in FIG. 7C, the crushed stone 101 and the filter unit 103 thereabove are arranged as a scouring prevention material. As the filter unit 103, for example, as described in Japanese Patent Application Laid-Open No. 2011-137365, a water-permeable bag body filled with a lump such as crushed stone can be used. The sheath pipe 20 is covered with these anti-scouring materials.

  After that, as in the first embodiment, the cable 22 is drawn into the steel pipe pile 11 through the sheath pipe 20 as shown in FIG. The transition piece 12 and the wind power generation facility 13 are also installed, and the cable 22 is connected to the wind power generation facility 13.

  Then, as in the first embodiment, the cable 22 outside the sheath tube 20 is embedded below the bottom surface of the water as shown in FIG. FIG. 9 is a diagram showing this state. Also at this time, the flexible portion 206 of the sheath tube 20 is bent so that the cable 22 can be easily embedded. As described above, the cable lead-in structure 2a for drawing the cable 22 into the steel pipe pile 11 through the sheath pipe 20 is formed.

  Also in the second embodiment, the same effect as that of the first embodiment can be obtained in which the free span of the cable 22 can be prevented with a simple structure when scouring occurs.

  In this embodiment, the crushed stone 101 and the filter unit 103 are used as the scouring preventive material. However, as shown in the cable lead-in structure 2b in FIG. 106 may be arranged. In this example, the sheath tube 20 is covered with an asphalt mat 106.

  FIG.10 (b) is the figure which looked at this state from the top. The asphalt mat 106 has a trapezoidal flat surface, and a plurality of pieces (six in the example in the figure) are arranged around the steel pipe pile 11 so that the sides are wrapped. A hole 106a is provided at the outer end of the asphalt mat 106 so that the asphalt mat 106 can easily follow scouring of the bottom of the water. Further, a part of the asphalt mat 106 is arranged such that the inner end portion is folded into the ground 100 along the steel pipe pile 11.

  Moreover, as shown to Fig.11 (a), the filter layer 107 by the scouring prevention material which is thin enough to be able to drive the steel pipe pile 11 is formed by using a crushed stone finer than the above-mentioned crushed stone, and thereafter, As shown in FIG. 11 (b), the steel pipe pile 11 is driven to tilt the sheath pipe 20, and the sheath pipe 20 is covered with the filter unit 103 as shown in FIG. 11 (c). It is also possible to draw in the cable lead-in structure 2c.

  Alternatively, as shown in FIG. 12A, a filter unit 103 is previously disposed on the water bottom instead of the filter layer 107, and the filter unit 103 is broken through as shown in FIG. It is also possible to drive the pile 11. An inexpensive bag or the like may be used for the filter unit 103 at a position that clearly breaks through.

  In addition, as shown in FIG. 13 (a), the filter unit 103 is intensively disposed at a necessary location on the bottom surface of the water, and the sheath tube 20 is tilted thereon to support the sheath tube 20 from below. It is also possible to do. In this example, the sheath tube 20 is further covered with the filter unit 103 to form the cable lead-in structure 2d. It is also possible to use crushed stone 101 or the like instead of the filter unit 103 below the sheath pipe 20, or to raise the shape of the water bottom obliquely upward toward the steel pipe pile 11.

  Further, as shown in FIG. 13 (b), a steel pipe pile 11 for cable drawing is separately placed, a cable drawing structure 2a is formed by the same method as described above, and the cable 22 is drawn into the steel pipe pile 11. It is also possible to pull the cable upward and connect the cable 22 to the wind power generation facility 13 at sea.

  In addition to the above embodiment, the sheath tube 20 can be rotated obliquely downward as schematically shown in FIG. The left figure of Fig.14 (a) is an example in case the hole 111 of the steel pipe pile 11 exists below a water bottom like 1st Embodiment, and the right figure shows the hole 111 of the steel pipe pile 11 with 2nd Embodiment. It is an example in the case of being above the water bottom similarly.

  In addition, when the ground 100 is a rock or the like, as shown schematically in FIG. 14 (b), the cable 22 outside the sheath tube 20 is protected on the bottom surface of the water by protecting it with a protection means (not shown). Also good. The left figure of FIG.14 (b) is an example in case the hole 111 of the steel pipe pile 11 exists below a water bottom like 1st Embodiment, and the right figure shows the hole 111 of the steel pipe pile 11 with 2nd Embodiment. It is an example in the case of being above the water bottom similarly.

  Moreover, although the above embodiment demonstrated and demonstrated the example of the offshore wind power generation equipment 1, it is not restricted to this, Other power generation facilities, such as a solar power generation facility and a ocean current power generation facility, or other than power generation facilities The cable 22 may be drawn into a steel pipe pile placed on the ground 100 as the foundation of the facility. The position of the hole 111 only needs to be above the maximum scouring depth, and the influence of scouring on the cable 22 can be easily and inexpensively prevented. Furthermore, the application target of the present invention is not limited to the steel pipe piles to be placed on the ground 100, and can be applied to the case where the cable 22 is drawn into various cylindrical structures arranged on the water bottom.

  The preferred embodiments of 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 are naturally within the technical scope of the present invention. Understood.

DESCRIPTION OF SYMBOLS 1; Offshore wind power generation equipment 2, 2a, 2b, 2c, 2d; Cable drawing structure 11; Steel pipe pile 12; Transition piece 13; Wind power generation equipment 20; Sheath pipe 21; H-shaped steel 22; 101; Crushed stone 103; Filter unit 106; Asphalt mat 110; Guide pipe 110a; Slit 111; Hole 113; Inner pipe 206;

Claims (14)

A cable lead-in structure for drawing a cable into a cylindrical structure disposed on the bottom of the water,
The cylindrical structure has a hole on a side surface,
A sheath tube attached to the side surface of the cylindrical structure so as to be rotatable in a vertical plane about the lower part as a center is tilted toward the bottom of the water,
A cable is drawn into the cylindrical structure from the hole through the inclined sheath tube ,
The sleeve pipe is rigid, middle flexible part is provided, characterized Rukoto flexible portion tilting the said sheath tube be located outside of the tubular structure away from the tubular structure Cable lead-in structure.   2. The cable lead-in structure according to claim 1, wherein a lower end portion of the sheath tube is inserted into the cylindrical structure from the hole by the tilt of the sheath tube toward the water bottom.   The cable lead-in structure according to claim 2, wherein a lower end portion of the sheath tube is bent in an arc shape. A vertical guide is provided on a side surface of the cylindrical structure,
The cable lead-in structure according to any one of claims 1 to 3, wherein the sheath tube is attached to a slider slidable along the guide. The guide is a tubular body having a slit,
5. The cable lead-in structure according to claim 4, wherein the slider is H-shaped steel.   The cable lead-in structure according to any one of claims 1 to 5, wherein an inner tube is provided inside the cylindrical structure so as to be continuous with the hole.   The cable lead-in structure according to any one of claims 1 to 6, wherein the cylindrical structure has a plurality of the holes along a vertical direction. The cylindrical structure is a steel pipe pile placed on the ground,
The cable lead-in structure according to any one of claims 1 to 7 , wherein a position of the hole through which the cable is passed is above a maximum scouring depth from a water bottom. The cable lead-in structure according to any one of claims 1 to 8 , wherein the sheath pipe is covered with a scour preventing material. A cable drawing method for drawing a cable into a cylindrical structure arranged on the bottom of the water,
A step of rotating the sheath tube attached to the side surface of the cylindrical structure in a vertical plane about the lower part and tilting it toward the bottom of the water;
A step of drawing the cable into the inside of the cylindrical structure from the hole on the side surface of the cylindrical structure via the inclined sheath tube;
I have a,
The sheath tube has rigidity, and a flexible portion is provided in the middle.
A cable drawing method , wherein when the sheath tube is tilted, the flexible portion is separated from the tubular structure and is located outside the tubular structure . A vertical guide is provided on a side surface of the cylindrical structure,
By sliding along the slider fitted with said sheath tube into the guide, cable entry method of claim 1 0, wherein the sheath tube, characterized in that attached to the tubular structure. When drawing the cable into the cylindrical structure,
The cable is connected to a rope that has gone out from the inside of the cylindrical structure through the sheath tube, and the cable is pulled into the cylindrical structure by pulling the rope. 1 0 or claim 1 1 cable guiding method according. A part of the rope is inserted into the sheath tube in advance, and both ends thereof are temporarily fixed inside the sheath tube, and one end of the rope is extended to the outside of the sheath tube during cable drawing work. , cable entry method of claim 1 2 wherein the use in the pull of the cable. A sheath tube unit to be attached to a cylindrical structure placed on the bottom of the water,
A sheath tube, and a slider slidable along a vertical guide provided on a side surface of the cylindrical structure,
Have
The sheath tube is attached to the slider so as to be rotatable in a vertical plane about the lower part as a center ,
The sheath tube has rigidity, and a flexible portion is provided in the middle.
The said flexible part is provided in the upper part of the said sheath tube, The sheath tube unit characterized by the above-mentioned .

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