JP3494900B2 - How to bury underwater cable - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to bury a cable such as an electric power cable in the bottom of a water by a laying ship that travels on the water and a burial machine that moves on the bottom of the water, and at the time of burial by a pollution prevention curtain installed in the water. The present invention relates to a method for burying a submarine cable that prevents the diffusion of excavated earth and sand.

[0002]

2. Description of the Related Art In a conventional method of burying a cable such as an electric power cable at the bottom of a water, as shown in FIG. 3, a laying ship 110 is made to sail on the water and the laying machine 20 is placed behind the laying ship 110. Move at the bottom of the water and lay barge 11
The coil-shaped cable 3 accommodated in the cable accommodation device 13 above 0 is fed into the water from the stern of the laying ship 110 by the cable feeding device 114, and the cable 3 is buried in the water bottom while excavating the water bottom by the embedding machine 20. There is.

Also, a flexible cylindrical pollution control screen 1
The buoys 131, 131, ... are installed in the water so that the buoys 131, 131 ... Support the buoys 131, 131 ...
Is pulled from the front and back by the laying boat 110 and the auxiliary pontoons 100, 100 via the wires 132, 132 ..
The burial machine 20 is surrounded by 0 to prevent the excavated soil and the like from spreading during burial.

[0004]

In the above-mentioned method for burying a submarine cable, the pollution prevention curtain 1 is provided so as to surround the burying machine 20.
In order to install 30 in the water, in addition to the laying boat 110 that travels in front of the burying machine 20, auxiliary pedestals 100, 100 that navigate behind the burying machine 20 are required. Since it is necessary to travel at the same speed as the auxiliary pontoons 100, 100, the work may be difficult if the influence of waves, wind, etc. is large. Further, although it is necessary to change the height of the pollution prevention curtain 130 according to the change of the water depth, when changing the height of the pollution prevention curtain 130 supported as described above, the work of burying the cable 3 must be performed. You need to suspend it. Further, the pollution prevention curtain 130, the auxiliary barges 100, 100
Due to such reasons, the water surface is occupied over a wide area, which causes problems such as hindering the navigation of other ships.

In view of the above problems, the present invention is designed to enclose the pollution preventive curtain so as to surround the buried machine without using an auxiliary barge or the like and without occupying the water surface over a wide area. Can be installed at the height of the pollution control curtain,
An object of the present invention is to provide a method for burying a submarine cable that can be easily changed without interrupting the burying work.

[0006]

According to a first aspect of the present invention, a cable is stored in a cable storage device on a laying ship by moving the laying ship on water and moving an burying machine on the water bottom. The cable is fed into the water by the cable feeding device on the ship, and the cable is buried in the water bottom while excavating the water bottom by the embedding machine, and the pollution prevention curtain is installed in the water so as to surround the embedding machine to disperse the excavated soil. In a method of burying a submarine cable to prevent with a pollution prevention curtain, a cable insertion opening penetrating the bottom of the hull is provided near the center of the hull of the laying carrier, and the upper edge of the pollution prevention film is
Placed on the inner circumference side of the cable insertion opening and extended downward
As the bottom edge reaches the bottom of the water and surrounds the burial machine
The cable is installed , the cable is fed into the water through the opening for inserting the cable in correspondence with the navigation speed of the laying carrier, and the burying machine is laid at the bottom of the water below the laying carrier.
It is controlled so that it travels at the same speed as the barge, and
Buried the cable while digging the bottom of the water and bury it in the bottom of the water.
A water bottom cable burying wherein the that.

According to the invention of claim 1, the pollution control
Place the top edge of the stop membrane inside the cable entry opening.
Extend it downwards so that the lower edge reaches the bottom of the water, and
Installed so as to surround and put the cable in the cable.
Corresponding to the navigation speed of the laying ship
Take it out into the water and place the burial machine under water below the laying ship.
Control at the bottom to run at the same speed as the laying ship,
The cable unwound while excavating the bottom of the water by the burying machine
By embedding it on the bottom of the water, it is possible to install the pollution prevention curtain in water so as to surround the embedding machine without using an auxiliary barge or the like. Therefore, the pollution control curtain can be easily moved along with the movement of the laying barge, so that the influence of waves, winds, etc. can be reduced and the burial work can be performed efficiently. Since the occupying area of the water surface and the occupying area of the water surface by the pollution prevention curtain overlap, it is possible to reduce the occupying area of the water surface and prevent the hindrance of navigation of other vessels.

In addition, the upper edge of the pollution prevention film is cabled.
Since it is arranged on the inner peripheral side of the entry opening, the upper portion of the pollution prevention curtain can be easily supported from above the hull of the laying ship via the cable entry opening.

The invention according to claim 2 is configured so that the pollution control curtain operating device on the hull of the laying ship moves the pollution control curtain up and down in accordance with a change in water depth. According to the invention described in claim 2 , the height of the pollution prevention film can be adjusted without interrupting the cable burying work, and the burying work can be efficiently performed when the cable is buried in an uneven water bottom. It can be carried out.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an elevational view showing an outline of a method for burying a submarine cable according to an embodiment of the present invention, and FIG. 2 is a plan view of FIG.

As shown in FIGS. 1 and 2, a laying ship 1 used in a method for burying a submarine cable according to an embodiment of the present invention.
0 is equipped with a hull 11 that floats above water and is configured to be able to navigate above water. Then, at a portion near the center of the hull 11, that is, at a portion closer to the center of gravity of the laying ship 10 than the stern or the bow, the cable insertion opening 12 penetrates the hull 11 vertically from the deck to the bottom of the boat, The front portion, the rear portion, and both lateral portions are formed so as to be surrounded in the front, rear, left, and right.

On the deck of the hull 11, a cable housing device 13 composed of a turntable or the like is installed so as to house the coiled cable 3, and the hull 11
On the deck of the above, a cable feeding device 14 such as a caterpillar type (endless track type) braking device is installed above the cable insertion opening 12 via a pedestal or the like so as to feed the cable 3 at a predetermined speed. Has been done. Also, the hull 1
Cable guide device 1 made of sheaves, etc. on the deck 1
5, the cable housing device 1 without forcibly bending the cable 3.
3 to the cable feeding device 14, the cable insertion opening 1
It is installed via a pedestal etc. so as to guide you to 2.

Further, on the deck of the hull 11, around the cable insertion opening 12, pollution prevention curtain operating devices 17, 17 ... Composed of winches and the like are connected to the upper edge of the pollution prevention curtain 30. It is provided to wind or unwind the hanging wire. The pollution prevention curtain 30 is formed in a flexible tubular shape, and the upper edge of the pollution prevention curtain 30 is arranged on the inner peripheral side of the cable insertion opening 12 and is located above the water surface S. So that it protrudes and is expanded into a cylinder,
Contamination prevention curtain operating device 17, 17 ...
The bottom edge of the pollution prevention curtain 30 is configured to reach the water bottom B.

The burial machine 20, such as a chain cutter burial machine, a plow burial machine, a water jet burial machine, runs on its own or is towed by the laying ship 10 via a tow wire to move the water bottom B. While moving and excavating the water bottom B, the cable 3 fed from the laying ship 10 is buried in the water bottom B.

In order to bury the cable 3 in the water bottom B by using the laying boat 10 and the burying machine 20, the laying boat 10
While traveling at a predetermined speed on the water, the burying machine 20 is moved on the water bottom B at the same speed as the laying ship 10, and the cable 3
Is put into the water from the laying ship 10 through the cable entry opening 12, and the cable 3 is paid out by the cable feeding device 14 at a predetermined speed so as to correspond to the navigation speed of the laying ship 10, and the burial machine 20 is used. The unrolled cable 3 is buried in the water bottom B while excavating the water bottom B.

At this time, the burial vessel 1 for laying the burying machine 20 on the water bottom B is installed.
It is controlled so as to be arranged below the cable insertion opening 12 of 0, the burying machine 20 is surrounded by the pollution prevention curtain 30 extending downward from the cable insertion opening 12, and the pollution prevention curtain 30 prevents Prevent the spread of excavated soil. Therefore, without using buoys, auxiliary barges, etc., the pollution control screen 30
Can be installed in the water so as to surround the burying machine 20, and the pollution control curtain 30 can be easily moved as the laying ship 10 moves, so that the influence of waves, wind, etc. can be reduced. The burial work can be performed efficiently. Further, since the water surface occupied area by the laying barge 10 and the water surface occupied area by the pollution prevention curtain 30 overlap, the water surface occupied area is reduced as a whole to prevent the hindrance of navigation of other ships. be able to. In addition, the water surface S by the cable 3
The occupation of the cable can also be prevented by feeding the cable 3 into the water through the cable insertion opening 12.

When the water bottom B of the burial site has undulations, the undulations of the water bottom B (changes in water depth) are dealt with.
The pollution prevention curtain operating device 17, 17 ... Moves the pollution prevention curtain 30 up and down through the hanging wire to change the height of the pollution prevention curtain 30. Therefore, the height of the pollution prevention film 30 can be adjusted without interrupting the burying operation of the cable 3, and the burying operation can be efficiently performed when the cable 3 is buried in the undulating water bottom B.

It should be noted that the hull 1 of the laying barge 10 due to waves or the like
1 causes yawing and other shaking, but the shaking near the center of the hull 11 is smaller than that at the bow or stern. Therefore, since the pollution prevention curtain 30 is supported through the cable insertion opening 12 in the central portion of the hull 11, the pollution prevention curtain 30 can be easily controlled, and the pollution prevention curtain 30 can prevent the excavation soil from spreading. Effectively prevent it. Moreover, since the cable 3 is paid out into the water through the cable insertion opening 12, the accuracy of the burying position of the cable 3 can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments. For example, in the above-described embodiment, in order to support the pollution prevention curtain by the laying ship, a case where the upper part of the pollution prevention curtain is arranged on the inner peripheral side of the cable insertion opening of the hull of the laying ship is described . Further, in the above embodiment, description has been made of the case where the cable is turned opening that performs feeding of the cable was placed in the center nearest portion of the hull of the lay barge. Further, the cable accommodation device, the cable feeding device, the cable guiding device, etc. on the laying ship may be arranged in any manner as long as the cable can be fed into the water through the cable insertion opening.

[0020]

As described above, according to the invention as set forth in claim 1, the upper edge portion of the pollution prevention film is provided at the central portion of the laying ship.
Located on the inner circumference side of the provided cable entry opening and below
To extend the bottom edge to the bottom of the water and surround the burial machine.
Is installed as described above, and the cable is fed into the water through the cable insertion opening in accordance with the navigation speed of the laying carrier, and the burying machine is placed on the bottom of the water below the laying carrier.
The controlled so as to run in laying barge and the same speed, buried in
The cable unwound while excavating the bottom of the water with the equipment
By burying in the bottom, without using an auxiliary barge ,
A pollution control screen can be installed underwater so as to surround the burial machine. Therefore, the pollution control curtain can be easily moved with the movement of the laying barge, so that the influence of waves, winds, etc. can be reduced and the burial work can be efficiently performed. Since the occupying area of the water surface and the occupying area of the water surface by the pollution prevention curtain overlap, it is possible to reduce the occupying area of the water surface and prevent the hindrance of navigation of other ships. In addition, an opening for cable insertion from the hull of the laying barge.
The upper part of the pollution control curtain can be easily supported through the mouth.
it can.

According to the invention of claim 2 ,
It is possible to adjust the height of the contamination preventing film without interrupting the burying operation of cable, it is possible to perform the burying operation when embedding the cables into water bottom undulating efficiently.

[Brief description of drawings]

FIG. 1 is an elevational view showing an outline of a method for burying a submarine cable according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view showing an outline of a conventional method for burying a submarine cable.

[Explanation of symbols]

3 cables 10 laying barges 11 hull 12 Cable entry opening 13 Cable storage device 14 Cable feeding device 15 Cable guide device 17 Pollution prevention curtain operation device 20 buried machines 30 Pollution prevention curtain B bottom S water surface

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02G 1/10

Claims (2)

(57) [Claims] 1. A laying pontoon sails on the water, an burying machine moves on the bottom of the water, and a cable accommodated in a cable accommodation device on the laying pier is fed into the water by a cable feeding device on the laying pier. While digging the bottom of the water by the burying machine, the cable is buried in the bottom of the water, and a pollution prevention curtain is installed in the water so as to surround the burying machine to prevent the diffusion of excavated earth and sand by the pollution prevention curtain. In the cable burying method, a cable insertion opening penetrating the bottom of the hull is provided near the center of the hull of the laying barge, and the upper edge of the pollution prevention film is set to the inner circumference of the cable insertion opening. On the side
Place it and extend it downwards so that the lower edge reaches the bottom and is buried.
Placed so as to surround the設機, the said cable through said cable-on opening
The laying ship is fed out into the water according to the navigation speed of the laying ship, and the burying machine is placed on the bottom of the water below the laying ship.
Control so that the vehicle runs at the same speed as the
A method for burying a submarine cable, which is characterized by burying it at the bottom of the water. 2. A water bottom cables buried設方method according to claim 1, characterized in that moving the pollution control curtain vertically in response to changes in water depth by pollution curtain operating device on the hull of the lay barge.