JP2000134751A - Pollution preventing method for burying subaqueous cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a pollution preventing curtain in underwater, without occupying large area of water surface, when a cable is buried in the bottom of the water by means of a water-surface laying ship, and a device for burying the cable in the bottom of the water. SOLUTION: An anchor 29 for extending a curtain is fixed in the bottom of the water behind a device 30 for burying the cable, a rear support member 27 is supported by the anchor 29 for extending the curtain, and a rear extending wire 7 is extended from a laying ship 10 and connected to a rear float body 21 via the rear support member 27. The front float body 21 is pulled toward the front the laying ship 10 via the front extending wire 6, and the rear float body 21 is pulled toward the rear with the rear support member 27 via the rear extending wire 7, so that a pollution preventing curtain 20 is opened in cylindrical shape and is installed in underwater so as to enclose the device 30 for burying. With the laying ship 10 and the burying 30 moving forward, the rear extending wire 27 is sent out from the laying ship 10, and the pollution preventing curtain 20 moves forward in a cylindrical open condition with the curtain spread in tube form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular pollution control curtain which surrounds a burial machine when a cable such as an electric power cable is buried in the water bottom by a laying barge advancing above the water and a burying machine advancing below the water bottom. The present invention relates to a method for preventing pollution when burying a submarine cable, wherein the method is installed in water to prevent the spread of excavated earth and sand at the time of burial by a pollution prevention curtain.

[0002]

2. Description of the Related Art When a cable such as an electric power cable is buried in a water bottom, as shown in FIG. 3, the laying barge 110 is advanced on the water, and the burying machine 30 is advanced on the water floor behind the laying barge 110. Then, the cable accommodation device 1 on the laying barge 110
3 lays the coiled cable 3 housed in the barge 110
The cable 3 is buried in the water bottom behind the laying barge 110 while being pulled out from the stern of the stern into the water by the cable feeding device 14 and excavating the water bottom by the burying machine 30.

A flexible tubular pollution control curtain 120 is supported under the water by buoys 121, 121 and installed underwater, and the auxiliary barges 100, 100 are advanced on the water behind the burying machine 30. , The buoys 121, 121... Are pulled back and forth by the laying barge 110 and the auxiliary barges 100, 100 via the wires 106, 106. 120 surrounds the burial machine 30 to prevent the spread of excavated earth and sand during burial.

[0004]

In the above-described pollution control method, the pollution control curtain 12 is arranged so as to surround the burial machine 30.
In order to install 0 underwater, in addition to the laying barge 110 floating on the water in front of the burying machine 30, the auxiliary barge 100, 100 floating on the water behind the burying machine 30 is necessary,
Since the water surface is occupied over a wide area by the auxiliary barges 100 and 100, there is a problem that the navigation of other ships is hindered. In addition, it is necessary to change the height of the pollution prevention curtain 120 according to the change in water depth. However, when changing the height of the pollution prevention curtain 120 supported as described above, the work of burying the cable 3 is required. You need to suspend.

[0005] In view of the above problems, the present invention is to install a flexible tubular pollution control curtain underwater in such a manner that it spreads out and moves forward without occupying a wide area of the water surface. The height of the pollution control curtain,
An object of the present invention is to provide a method for preventing pollution when burying a water bottom cable, which can be easily changed without interrupting the burying work.

[0006]

According to the first aspect of the present invention, the laying barge is advanced on the water, the burying machine is advanced on the water bottom behind the laying barge, and housed in the cable storage device on the laying barge. When the cable is buried in the water while the cable is buried in the water bottom by excavating the water bottom with the burying machine, the flexible tubular pollution prevention curtain is floated by the floating body. In the pollution prevention method when burying a submarine cable, which is installed underwater so as to surround the buried machine while supporting it from below, and the diffusion of excavated earth and sand is prevented by the pollution prevention curtain, a back support member is installed in the water behind the buried machine Then, the floating body or the pollution prevention curtain is pulled forward by the laying barge through the front deployment wire such as a wire, and is pulled backward by the rear support member through the rear deployment wire such as a wire. And it has a configuration for advancing together with widening the pollution control curtain cylindrical.

According to the first aspect of the present invention, an auxiliary barge that floats on the water can be used by pulling the floating body or the pollution prevention curtain back and forth by the barge laid on the water and the rear support member in the water. Instead, the anti-pollution curtain can be spread out into a tube and installed underwater to surround the burial machine,
It is possible to reduce the area occupied by the water surface, thereby preventing hindrance to navigation of other ships.

According to a second aspect of the present invention, a curtain deploying anchor is fixed to the water bottom behind the burying machine, a rear supporting member is supported by the curtain deploying anchor, and the rear deployable wire is extended from the laying barge. Then, it is connected to the floating body or the pollution prevention membrane via the rear support member, and the rear deployment wire is sent from the laying barge as the laying barge advances. According to the invention described in claim 2, with the advance of the laying barge,
The anti-pollution curtain can be easily extended and advanced.

According to a third aspect of the present invention, the upper support member is supported by the floating body, and a suspension wire such as a wire is extended from the laying barge and connected to the pollution prevention curtain via the upper support member. Then, according to the change in water depth, the suspension wire is wound up or sent out from the laying barge, and the pollution prevention curtain is moved up and down. According to the third aspect of the present invention, the height of the pollution prevention membrane can be easily adjusted without interrupting the cable burying work, and the burying work can be efficiently performed when the cable is buried on the uneven water bottom. Can be done

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view schematically showing a method of burying a submarine cable according to an embodiment of the present invention, and FIG. 2 is a plan view showing a state in which a laying barge, a burying machine, and a pollution prevention curtain in FIG. FIG.

As shown in FIGS. 1 and 2, a laying barge 1 used in a method of burying a submarine cable according to an embodiment of the present invention.
Numeral 0 is provided with a hull 11 floating on the water, and is configured to be able to move on the water. On the deck near the center of the hull 11, a cable housing device 13 composed of a turntable or the like is provided so as to house the cable 3 in a coil shape and send it out rearward. A cable feeding device 14 such as a caterpillar type brake device is provided on the deck of the (side) so as to feed the cable 3 from the rear end (stern) of the hull 11 into the water at a predetermined speed.

On the water bottom behind the laying barge 10, a burying machine 30, such as a chain cutter burial machine, a plow burying machine, or a water jet burying machine, runs by itself or lays it via a traction wire. The burial machine 30 is installed so as to move forward by being towed by the barge 10,
While excavating the water bottom, the cable 3 unreeled from the laying barge 10 is buried in the water bottom.

On the water above the burying machine 30, a plurality of floating bodies 21, 21... Such as floats are installed in a ring form, and in the water below the floating bodies 21, 21. The flexible cylindrical pollution prevention curtain 20 is mounted on the floating body 2.
1, 21... Are supported via the suspension wires 5, 5,. In the pollution prevention curtain 20, the front floating bodies 21, 21 are pulled obliquely forward (outward) by the laying barge 10 via the front deployment wires 6, 6, and the rear floating bodies 21, 21 are moved rearward. By being pulled obliquely rearward (outward) by the rear support members 27, 27 via the deployment wires 7, 7, it is expanded into a cylindrical shape, and the front floating body 2
1 and 21 are laying barges 1 via forward deployment wires 6 and 6
0, it moves up and down by the suspension wires 5, 5,..., And the lower edge reaches the water bottom to surround the burying machine 30.

That is, curtain deployment anchors 29, 29 are fixed to the water bottom obliquely rearward of the floating bodies 21, 21,.
, Rear support members 27, 27 such as pulleys are supported in the water near the bottom of the water. On the other hand, the hull 1 of the
On both left and right sides of the rear part of 1, curtain unfolding operation devices 17, 17 including winches and the like are provided so as to wind or unwind the rear unfolding wires 7, 7. The rear deployment wires 7, 7 extend obliquely rearward from the laying barge 11, and extend rearward from the floating bodies 21, 21,.
7 and is bent by the rear support members 27 and 27 to extend obliquely forward, and is connected to the rear floating bodies 21 and 21. Further, forward deploying wires 6, 6 are connected to the rear end of the hull 11 of the laying barge 10, and the forward deploying wires 6, 6 extend obliquely rearward and float on the front side.
It is connected to the.

The floating bodies 21, 21,... Support upper support members 25, 25, such as pulleys, and a deck at the rear of the hull 11 of the laying barge 10 is provided with a winch or the like. Are provided so as to take up or send out the suspension wires 5, 5,.... The suspension wires 5, 5,...
1 extend rearward and reach the floating bodies 21, 21..., And are bent downward by the upper support members 25, 25.

In order to bury the cable 3 in the water bottom by using the laying barge 10 and the burying machine 30, the laying barge 10 is advanced at a predetermined speed on the water, and the burying machine 30 is connected to the laying barge 10 on the water bottom. At the same speed, the cable 3 is put into the water from the stern of the laying barge 10, and the cable 3 is fed out at a predetermined speed by the cable feeding device 14 so as to correspond to the forward speed of the laying barge 10. The cable 3 pulled out is buried in the water bottom while excavating the water bottom.

In particular, when a high-precision burial position is required, the anchor wires 9 are extended obliquely forward and obliquely rearward from the decks at the front and rear of the hull 11 of the laying barge 10. The anchor wires (9, 9) are fixed to the water bottom by an anchor (not shown), and the front anchor wires (9, 9) are wound up by a hull position operating device (not shown) such as a winch on the deck of the hull 11, and the rear anchor wire (9) is wound. , 9 by moving the laying barge 10 forward,
The laying barge 10 may be advanced while regulating the position.

In order to prevent the spread of excavated earth and sand at the time of embedding by the pollution prevention curtain 20, the rear deployment wire 7,
7 is sent out by the curtain unfolding operation devices 17 and 17 at a predetermined speed corresponding to the forward speed of the laying barge 10 and the burying machine 30, and the pollution prevention curtain 20 is spread in a tubular shape and the laying barge 10 and the burial The burial machine 30 is moved forward at the same speed as the machine 30, and the pollution control curtain 20 surrounds the buried machine 30.

Therefore, without using the auxiliary barge floating on the water, the pollution control curtain 20 is expanded in a tubular shape through the rear deployment wires 7 by the rear support members 27, 27 installed in the water. Since it can be installed in the water, the area occupied by the water surface can be reduced, and it is possible to prevent the navigation of other ships from being hindered. Further, by sending the rear deployment wires 7, 7 out of the laying barge 10, the pollution prevention curtain 2 is provided.
0 can be easily advanced in a state where it is spread in a cylindrical shape.

In the case where the water bottom of the buried area has undulation, the hanging wire 5 is moved by the curtain up / down operation devices 15 on the laying barge 10 so as to correspond to the undulation (change in water depth) of the water bottom. Take up or send out 5 ... and prevent pollution 2
By moving 0 vertically, the height of the pollution prevention curtain 20 is changed. Therefore, the height of the pollution prevention film 20 can be easily adjusted without interrupting the embedding work of the cable 3, and the embedding work can be efficiently performed when the cable 3 is buried in the uneven water bottom. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above-described embodiment, the rear support member is fixed in water by the curtain deployment anchor, and the rear deployment wire (wire) connecting the rear support member and the pollution prevention curtain is sent out from the laying barge to prevent pollution. Although the case where the curtain is advanced with the laying barge has been described, the rear support member may be installed in the water so as to advance with the laying barge.

[0022]

According to the first aspect of the present invention, the auxiliary barge that floats on the water by pulling the floating body or the pollution prevention curtain back and forth by the barge laid on the water and the rear support member in the water. Without using it, the pollution prevention curtain can be installed in the water so as to surround the buried machine by spreading it in a tubular shape, thus reducing the area occupied by the water surface and hindering navigation of other ships. Can be prevented.

According to the second aspect of the present invention, the pollution prevention curtain can be easily advanced in a spread state as the laying barge advances. According to the third aspect of the present invention, the height of the pollution prevention film can be easily adjusted without interrupting the cable burying work, and the burying work can be performed when the cable is buried on the uneven water bottom. Can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a method for preventing pollution when a submarine cable is buried according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which a laying barge, a burying machine, and a pollution control curtain in FIG. 1 have advanced.

FIG. 3 is a plan view schematically showing a conventional method for preventing pollution when burying a submarine cable.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 cable 5 hanging wire 6 forward deploying wire 7 backward deploying wire 9 anchor wire 10 laying boat 11 hull 13 cable storage device 14 cable feeding device 15 curtain vertical movement operation device 17 curtain deployment operation device 20 pollution prevention curtain 21 flotation body 25 Upper support member 27 Rear support member 29 Curtain deployment anchor 30 Burial machine

Claims (3)

[Claims] 1. A laying barge is advanced on the water, a burying machine is advanced on a water bottom behind the laying barge, and a cable accommodated in a cable storage device on the laying barge is fed out on the laying barge. When the cable is buried in the water bottom while being pulled out into the water by the device and excavating the water bottom by the burying machine, the flexible tubular anti-pollution curtain is supported by the floating body from above the water and the burying machine is supported. In the pollution prevention method at the time of burying a submarine cable laid underwater so as to surround and prevent the diffusion of excavated earth and sand by the pollution prevention curtain, a back support member is installed in the water behind the burying machine, Alternatively, the pollution prevention curtain may be pulled forward by the laying barge through a front deployment wire such as a wire, and pulled backward by the rear support member through a rear deployment wire such as a wire. The method for preventing pollution when burying a submarine cable is characterized in that the pollution prevention curtain is spread in a tubular shape and moved forward. 2. An anchor for curtain deployment is fixed to the water bottom behind the burying machine, a rear support member is supported by the anchor for curtain deployment, and a rear deployment wire is extended from the laying barge via the rear support member. And connected to the floating body or the pollution prevention membrane,
The pollution prevention method at the time of burying a submarine cable according to claim 1, wherein the rearward deployed wire is sent from the laying barge as the laying barge advances. 3. An upper support member is supported by a levitating body, and a hanging wire such as a wire is extended from the laying barge and connected to the pollution prevention curtain via the upper support member. The pollution control method according to claim 1 or 2, wherein the pollution control curtain is moved up and down by winding or sending out the suspension wire from the laying barge.