JPH08196012A - Submarine cable laying device and laying method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a submarine cable laying technique that enables a cable to be laid at an accurate position on the seabed with a simple device. [Structure] Placed across the pipeline 14,
Gate frame 18 sliding along the pipeline 14 by towing
And a guide 19 which is integrally attached to the gate frame 18 and guides the cable 11 continuously fed from the sea toward the side of the pipeline 14, and is arranged on the advancing side of the gate frame 18 A plurality of nozzles 24 for injecting high-pressure water toward the traveling side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine cable laying apparatus and method.

[0002]

2. Description of the Related Art Conventionally, this type of laying work is carried out by laying the cable on the seabed while paying out the cable from a laying ship carrying the submarine cable. In addition, recently, in consideration of an example of a cable breakage caused by a fish, backfilling has also been performed after laying the cable in the trench.

[0003]

In the technique of laying a submarine cable described above, it is difficult to lay it at an accurate position due to the ocean current, meandering of the laying ship, etc., because the cable is simply dropped into the sea. Is. In particular, when backfilling a submarine cable, it is necessary to lay the cable accurately along the trench, and it is desired to propose an improvement technique for the cable.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a submarine cable laying technique capable of laying a cable at an accurate position on the seabed with a simple device. To provide.

[0005]

SUMMARY OF THE INVENTION The present invention is a submarine cable laying device for laying a cable along an existing pipeline, which is placed across the pipeline and pulled along the pipeline. A submarine cable laying device comprising a sliding gate frame and a guide that is integrally attached to the gate frame and guides a cable continuously fed from the sea toward the side of the pipeline. is there. Furthermore, the present invention is a submarine cable laying device for laying a cable along an existing pipeline,
A gate frame that is placed across the pipeline and slides along the pipeline by towing, and a cable that is integrally attached to the gate frame and continuously fed from the sea toward the side of the pipeline. And a plurality of nozzles that are disposed on the advancing side of the gate frame and that eject high-pressure water toward the advancing side of the gate frame. Further, the present invention is the submarine cable laying device, wherein the gate frame comprises a plurality of running wheels that run on the outer peripheral surface of the pipeline. Further, the present invention is a submarine cable laying device, characterized in that the above-mentioned derivative is constituted by a hollow cylindrical body bent in a substantially L shape, and a cable entrance of the cylindrical body is formed wide. Furthermore, the present invention is a submarine cable laying device, characterized in that it comprises a sheave rotatably rotatably supporting the above-mentioned derivative on a gate frame. Furthermore, the present invention is a submarine cable laying device, characterized in that the above-mentioned derivative is arranged on one side of a gate frame. Further, the present invention is a submarine cable laying device, characterized in that a plurality of the above-mentioned derivatives are arranged on both sides of a gate frame. Furthermore, the present invention is a method for laying a submarine cable that is already installed on the seabed while continuously feeding out the cable from the sea, using any one of the above-mentioned laying devices, and pulling the laying device along the pipeline to the laying device. It is a method of laying a submarine cable, characterized in that the inserted cable is continuously fed out from the sea and the cable is guided to the side of the pipeline to be laid. Furthermore, the present invention is a method for laying a submarine cable that is already installed on the seabed while continuously feeding out the cable from the sea, using any one of the above laying devices, and injecting high-pressure water toward the advancing side of the traction device, Towing the laying device along the line,
It is a method of laying a submarine cable, characterized in that the cable inserted into the laying device is continuously fed out from the sea and the cable is guided to the side of the pipeline for laying.

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. <A> Laying principle FIG. 1 shows a conceptual diagram of laying the cable 11 on the seabed using the laying device 10. In the figure, reference numeral 12 is a laying ship, and the roll-shaped cable 11 mounted by the feeding device 13 with a braking function can be continuously fed out. Reference numeral 14 is a pipeline, which is laid in a trench 16 on the seabed 15 prior to the cable 11. The laying device 10 is slidably engaged across the pipeline 14 and also laid by the laying ship 12
A tow line 17 is connected between the and. The laying device 10 is capable of laying the cable 11 to the side of the pipeline 14 while moving along the pipeline 14 by the traction force of the laying ship 12. An example of the laying device will be described below.

<B> Laying Device FIG. 2 shows a perspective view of the laying device 10, and FIG. 3 shows a front view thereof. The laying device 10 is a guide frame 1 that guides the gate frame 18 and the cable 11 whose sides are open downward to the side of the pipeline 14.
9 is the main constituent. The gate frame 18 has an opening width capable of straddling the pipeline 14 from above, and traveling wheels 21 are pivotally supported at the ends of the brackets 20 projecting from the inside thereof. It can run along the pipeline 14. Suspending hooks 22 are provided at a plurality of locations on the upper portion of the gate frame 18, and a ropeway (not shown) is connected to the suspending hooks 22 to suspend the laying device 10 from falling over to the side. As another fall prevention means of the laying device 10, skis capable of sliding on the seabed may be attached to the lower ends of both sides of the gate frame 18. Further, in order to ensure stability in the sea, the laying device 10 is given an appropriate weight. The guide 19 fixed to either the inside or outside of the side portion of the gate frame 18 is a hollow cylinder having a substantially L shape, and the open end (the entrance of the cable) of one inclined portion 19a of the cylinder is a trumpet. The opening end (cable discharge port) of the other horizontal portion 19b of the tubular body is located at the lower lateral portion of the pipeline 14. Gate frame 18
A pipe body 23 is integrally attached to the advancing side of the pipe 14 across the pipeline 14, and a plurality of nozzles 2 that discharge high-pressure water toward the advancing side of the device 10 are provided on the way of the pipe body 23.
4 are arranged. A submersible pump 25 mounted on the gate frame 18 is connected to the pipe body 23, and when the laying apparatus 10 is moved, high-pressure water is jetted to remove the earth and sand located in front. The high-pressure water is sprayed in order to forcibly remove the earth and sand naturally accumulated in the pipeline 14 and smoothly slide the laying apparatus 10. Therefore,
If no natural sedimentation is found in the pipeline 14, the high-pressure water injection facility may be omitted.

[0008]

Next, a method of laying a cable will be described.

<B> Laying Preparation In FIG. 1, the laying device 10 suspended by the crane 26 of the laying ship 12 and suspended is placed across the pipeline 14. The cable 11 on the laying ship 12 is inserted into the conductor 19 of the laying device 10 via the feeding device 13. Between the front part of the laying device 10 and the laying ship 12 is a tow line 1.
7 are connected.

<B> Laying start: The laying device 10 is pulled along the laying direction while the cable 11 is being unwound from the laying ship 12. As shown in FIGS. 2 and 3, the laying device 10 placed on the pipeline 14 via the plurality of traveling wheels 21 is connected to the pipeline 1 as the laying ship 12 is towed.
Move along 4. As a result, the cable 11 unwound from the laying ship 12 passes through the conductor 19 and is laid next to the pipeline 14. Since the guide 19 of the laying device 10 moored to the pipeline 14 is forcibly guided to the side of the pipeline 14, the route of the laying ship 12 is slightly deviated from the planned laying line, or the cable 11 is swept by the tidal current. However, it can be accurately laid along the pipeline 14. During the laying work of the cable 11, high-pressure water is jetted from the nozzle 24 in the traveling direction to remove the earth and sand in front.

<C> Backfilling When the laying of the cable 11 is completed, the trench 16 is backfilled if necessary, and the cable 11 together with the pipeline 14 is filled.
Protect.

[0012]

Second Embodiment In the first embodiment, the case where the derivative 19 is composed of a cylinder has been described, but sheaves may be used instead. The sheaves are aligned with the guiding position of the cable 11, for example, along the guiding line of the cable 11, the upper and lower portions of the gate frame 18 (the positions of the open end of the inclined portion 19a of the dielectric 19 in the first embodiment and the inclined portion 19a And the horizontal portion 19b are bent and rotatably supported respectively, and the upper sheaves serve to guide the cables 11 delivered from the laying ship 12 to the laying device 10, and the lower sheaves 11 Will be guided to the side of the pipeline 14. The sheaves in this embodiment include pulleys and rollers having a spindle in a direction orthogonal to the laying direction of the cable 11.

[0013]

[Third Embodiment] In the above embodiment, the case where the laying device 10 is provided with one dielectric 19 has been described. However, a plurality of dielectrics 19 and 19 are provided on both sides of the gate frame 18 and the cable is provided on both sides of the pipeline 14. In some cases, it may be configured to guide and lay the 11, 11.

[0014]

Since the present invention is as described above, the following effects can be obtained. <B> The cable can be forcibly guided to the side of the pipeline, so the cable can be laid in an accurate position. <B> Since the laying device can be moved only by the pulling operation, the laying device itself does not have a self-propelled means, and the device can be simplified. <C> When the laying device includes a nozzle for injecting high-pressure water, the laying device can be moved smoothly by removing the front soil.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a laying principle according to a first embodiment.

FIG. 2 is a perspective view of a laying device.

[Fig. 3] Front view of the laying device

Claims (9)

[Claims] 1. A submarine cable laying device for laying a cable along an existing pipeline, comprising: a gate frame placed across the pipeline and sliding along the pipeline by towing; and the gate frame. A submarine cable laying device, comprising: a cable that is integrally attached to a cable and guides a cable that is continuously fed from the sea toward the side of a pipeline. 2. A submarine cable laying device for laying a cable along an existing pipeline, wherein the gate frame is placed across the pipeline and slides along the pipeline by towing. Installed on the side of the pipeline, and a guide that guides the cable that is continuously fed from the sea toward the side of the pipeline, and is installed on the advancing side of the gate frame and injects high-pressure water toward the advancing side of the gate frame. A submarine cable laying device comprising a plurality of nozzles. 3. The submarine cable laying device according to claim 1, wherein the gate frame includes a plurality of running wheels that run on an outer peripheral surface of the pipeline. 4. The method according to any one of claims 1 to 3, characterized in that the derivative is formed of a hollow cylindrical body bent into a substantially L shape, and a cable entrance of the cylindrical body is formed wide. Submarine cable laying equipment. 5. The submarine cable laying device according to claim 1, wherein the guide is constituted by a sheave rotatably supported on a gate frame. 6. The submarine cable laying device according to claim 1, wherein the derivative is arranged on one side of the gate frame. 7. The submarine cable laying device according to claim 1, wherein a plurality of dielectrics are arranged on both sides of the gate frame. 8. A method for laying a submarine cable that is already installed on the seabed while continuously feeding the cable from the sea, wherein the laying apparatus according to any one of claims 1 to 7 is used to lay along a pipeline. A method of laying a submarine cable, characterized in that while pulling the device, the cable inserted into the laying device is continuously fed from the sea to guide the cable to the side of the pipeline. 9. A method of laying a submarine cable which is already installed on the seabed while continuously feeding the cable from the sea, wherein the laying device according to any one of claims 2 to 7 is used to direct the traction device to a traveling side. It is characterized by injecting high-pressure water and pulling the laying device along the pipeline, continuously feeding out the cable inserted in the laying device from the sea and guiding the cable to the side of the pipeline. How to lay a submarine cable.