Installation method for cable movement prevention body and cable movement prevention body

Abstract

To provide an installation method for a cable movement prevention body, which is easily installed, and the cable movement prevention body.SOLUTION: An installation method for a cable movement prevention body includes covering a cable 3, which is laid on a sea bottom 2 or the bottom of water, with a water permeable flat member 1 including fillers.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for installing a cable movement prevention body and a cable movement prevention body, and more particularly to a method for installing a cable movement prevention body and a cable movement prevention body that are easy to install. [Background technology]

[0002] When transmitting electricity between an offshore power plant and land, or between land areas separated by sea, it is necessary to install transmission lines on the seabed. However, on the seabed (especially in shallow areas), currents can cause the power cables to move and become damaged by chafing. In addition, it is necessary to protect the cable from collisions with floating objects in the sea, ship anchors, fishing gear, and boulders. That is, Patent Document 1 proposes a cable covering using a bag material. Moreover, Patent Document 2 proposes a cable covering using a sheet and a bag material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-139629 A [Patent Document 2] JP 2022-40874 A Summary of the Invention [Problem to be solved by the invention]

[0004] That is, in the case of the cable cover described in Patent Document 1, mesh-like bags containing filler material are arranged side by side to cover the cable (FIG. 11 of Patent Document 1), or mesh-like bags containing filler material are stacked to cover the cable (FIG. 13 of Patent Document 1). In addition, in the case of the technique described in Patent Document 2, work is carried out to combine the sheet material and the foot protection material, and then the protective structure made up of the combined sheet material and foot protection material is installed on a cable on the seabed via a suspension rope.

[0005] However, in the system described in Patent Document 1, a plurality of bags must be installed on the seabed one by one using a crane on a work vessel, which makes installation troublesome. Furthermore, in the case of the system described in Patent Document 2, multiple foot protection materials must be individually integrated into the sheet material, which poses the problem of cumbersome installation.

[0006] The present invention has been made in consideration of the above circumstances, and has an object to provide a method for installing a cable movement prevention device and a cable movement prevention device. [Means for solving the problem]

[0007] The method for installing a cable movement prevention body described in claim 1 involves covering a cable laid on the seabed or bottom of a body of water with a water-permeable flat member having a filling material therein.

[0008] Furthermore, the installation method for a cable movement prevention body described in claim 2 is the installation method for a cable movement prevention body described in claim 1, wherein the water-permeable flat member is a mesh bag or a steel box, the bottom area of ​​the water-permeable flat member is 20 m2 or more, and the filling material is stone having a particle size of 5 mm to 80 mm.

[0009] The cable movement prevention device described in claim 3 is a water-permeable flat member containing a filler material, which covers a cable laid on the seabed or the bottom of the water.

[0010] Furthermore, the cable movement prevention body described in claim 4 is the cable movement prevention body described in claim 3, wherein the water-permeable flat member is a mesh bag or a steel box, the bottom area of ​​the water-permeable flat member is 20 m2 or more, and the filling material is stone having a particle size of 5 mm to 80 mm. Effect of the Invention

[0011] According to the installation method of the cable movement prevention body described in claim 1, since the cable laid on the seabed or the bottom of the water is covered with a water-permeable flat member containing a filling material, it is not necessary to "arrange mesh-like bags containing a filling material in parallel" as described in Patent Document 1, and it is not necessary to "individually integrate a plurality of root protection materials into a sheet material" as described in Patent Document 2, which makes installation easy.

[0012] Furthermore, according to the installation method of the cable movement prevention body described in claim 2, in addition to the effects of the invention described in claim 1 described above, the water-permeable flat member is a mesh bag or a steel box, and the filling material is stone having a particle size of 5 mm to 80 mm, so that damage due to friction between the cable and the water-permeable flat member can be prevented.

[0013] In addition, according to the cable movement prevention device described in claim 3, since the cable laid on the seabed or the bottom of the water is covered with a water-permeable flat member containing a filling material, it is not necessary to "arrange mesh-like bags containing a filling material in parallel" as described in Patent Document 1, and it is not necessary to "individually integrate a plurality of root protection materials into a sheet material" as described in Patent Document 2, which makes installation easier.

[0014] Furthermore, according to the cable movement prevention device described in claim 4, in addition to the effects of the invention described in claim 3 described above, the water-permeable flat member is a mesh bag or a steel box, and the filling material is stone having a particle size of 5 mm to 80 mm, so that damage due to friction between the cable and the water-permeable flat member can be prevented. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic perspective view of a cable movement prevention device according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A method for installing a cable movement prevention device and a cable movement prevention device according to one embodiment of the present invention will be described with reference to FIG.

[0017] S shown in Figure 1 is a cable movement prevention body. The cable movement prevention body S is a water-permeable flat member 1 containing a filling material, which covers a cable 3 laid on the seabed 2 (or the bottom of the water). Specifically, the water-permeable flat member 1 is, for example, a mesh bag or a steel box, and is a substantially rectangular parallelepiped with a length of 2 m, a width of 10 m, and a height of 0.25 m. The base area of ​​the water-permeable flat member 1 is preferably 20 m2 or more. In addition, a water-permeable flat member 1 containing a filler material therein may be used, but it is preferable to divide the interior of the water-permeable flat member 1 into cells (small chambers) as shown in Figure 1 and to contain a filler material (not shown) within the cells (small chambers).

[0018] The filling material (not shown) is, for example, a stone having a grain size of 5 mm to 80 mm. If the grain size of the stone is less than 5 mm, the water permeability effect of the cable movement prevention body S is reduced, and if the grain size of the stone exceeds 80 mm, the stone (not shown) protruding from the water permeable flat member 1 moves due to ocean currents, increasing the risk of damaging the cable 3.

[0019] The cable movement prevention body S can be installed by hoisting a water-permeable flat member 1 containing filling material using a crane on a work ship (not shown), and installing it so as to cover the cable 3 laid on the seabed 2 (or the bottom of the water).

[0020] Therefore, according to the installation method of the cable movement prevention body of this embodiment (cable movement prevention body), installation is easy because it does not require "arranging mesh-like bags containing filling material in parallel" as described in Patent Document 1, and does not require "the work of individually integrating multiple root protection materials into a sheet material" as described in Patent Document 2.

[0021] Furthermore, according to the above-mentioned cable movement prevention body S (installation method of a cable movement prevention body), the cable 3 laid on the seabed 2 (or the bottom of the water) is covered with a permeable flat member 1 having stones (not shown) with a grain size of 5 mm to 80 mm contained therein. Therefore, since the grain size of the stones (not shown) is small at 5 mm to 80 mm, damage due to rubbing between the cable 3 and the permeable flat member 1 is prevented, and the stones (not shown) with a grain size of 5 mm to 80 mm are contained within the permeable flat member 1 and prevented from flowing out to the outside, thereby ensuring stability of the stones against ocean currents (or water currents). Furthermore, the weight of the permeable flat member 1 having stones (not shown) with a grain size of 5 mm to 80 mm contained therein makes it unnecessary to use a pressure member that was previously required.

[0022] The water-permeable flat member 1 is a mesh-like bag body formed of, for example, a fiber net. In other words, since the permeable flat member 1 is formed of a flexible net, it tightly covers the cable 3, further preventing the cable 3 from moving, and also follows the ground around the seabed 2 (or the bottom of the water) and tightly abuts against the surrounding ground, ensuring stability against ocean or water currents. [Explanation of symbols]

[0023] S Cable movement prevention body 1 Mat-like member 2. Seabed or bottom of water 3 Cable

Claims

1. A cable is covered on the seabed or bottom of the water with a water-permeable flat member containing a filling material, The flat member has, in a plan view, a plurality of vertical portions parallel to a longitudinal direction of the cable and a horizontal portion transverse to the longitudinal direction of the cable, the vertical portions having flexibility along the vertical portions, The vertical portion is deformed so as to follow the cable laid on the seabed or the bottom of the water by utilizing the flexibility of the vertical portion. A method for installing a cable movement prevention body, comprising:

2. A cable is covered on the seabed or bottom of the water with a water-permeable flat member containing a filling material, The flat member has, in a plan view, a plurality of vertical portions parallel to a longitudinal direction of the cable and a horizontal portion transverse to the longitudinal direction of the cable, the vertical portions having flexibility along the vertical portions, The vertical portion is deformed so as to follow the cable laid on the seabed or the bottom of the water by utilizing the flexibility of the vertical portion, The flat member covers the cable laid on the seabed or the bottom of the water, and in a front view, the flat member has a covering portion that abuts against the cable to cover the cable, one portion that extends from one side of the covering portion in a direction away from the cable and is deformed along the seabed or the bottom of the water, and the other portion that extends from the other side of the covering portion in a direction away from the cable and is deformed along the seabed or the bottom of the water. A method for installing a cable movement prevention body, comprising:

3. The water-permeable flat member is a mesh bag or a steel box, and the bottom area of ​​the water-permeable flat member is 20 m2 or more; The filling material is stone with a particle size of 5mm to 80mm. The flat member has, in a plan view, a plurality of vertical portions parallel to the longitudinal direction of the cable and a horizontal portion transverse to the longitudinal direction of the cable, and the length of the vertical portions is longer than the length of the horizontal portions.

3. A method for installing a cable movement prevention device according to claim 1 or 2.

4. A cable is covered on the seabed or bottom of the water with a water-permeable flat member containing a filling material, The flat member has, in a plan view, a plurality of vertical portions parallel to a longitudinal direction of the cable and a horizontal portion transverse to the longitudinal direction of the cable, the vertical portions having flexibility along the vertical portions, The flat member covering the cable laid on the seabed or the bottom of the water has, in a front view, a covering portion that abuts against the cable and covers the cable, one portion extending from one side of the covering portion in a direction away from the cable, and another portion extending from the other side of the covering portion in a direction away from the cable. A cable movement prevention body characterized by:

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