JP2000092642A - Laying of underwater cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of an installed position of a cable by reducing the effects due to pitching and rolling caused by waves, etc., and to prevent it from becoming obstacles, etc., to other ships' cruising by reducing its occupancy area on the surface of the water. SOLUTION: An opening 12 for casting a cable (an opening for manipulating a wire), which penetrates from a deck through the bottom, is formed to the center of the body 1 of a cable installing barge 10. A tractor wire 21 and anchor wires 19, 19, etc., are extended into the water from the bottom of the ship body 11 through the opening 12 for casting a cable. The cable installation barge 10 is navigated on the water, with its position being controlled through the anchor wires 19, 19, etc. During navigation, a cable laying machine 20 is pulled and moved at a bottom B of the water by the cable installation barge 10 through the tractor wire 21. A cable 3 stored in a cable storage equipment 13 on the cable installing barge 10 is drawn out into the water by means of a cable feeder 14 through the opening 12 for casting a cable to be laid on the bottom B of the water by the cable laying machine 20 with the bottom B of the water being dug.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater cable burying method for burying a cable such as an electric power cable on a water bottom by a laying barge navigating on water and a burying machine moving on the water bottom.

[0002]

2. Description of the Related Art In a conventional undersea cable embedding method of embedding a cable such as an electric power cable in a water bottom, as shown in FIGS.
The burying machine 20 is moved on the water bottom B by extending the traction wire 121 from the top of the stern of the stern to the rear and pulling the burying machine 20. And the laying barge 11
The coiled cable 3 accommodated in the cable accommodating device 13 above is laid out from the stern of the laying barge 110 into the water by the cable feeding device 114, and is buried by the burying machine 20.
The cable 3 is buried in the bottom B while excavating.

In particular, when a high-precision burial position is required, the anchor wires 119 and 11 are moved downward from the front and rear decks of the laying barge 110 downward and forward.
9 are extended and fixed to the water bottom B by anchors 119a, 119a..., And the front anchor wires 119, 119 are wound by the anchor wire operating devices 118, 118. The position of the laying barge 110 is controlled by unwinding the wires 119 and 119.

[0004]

As the sway of the laying barge 110 due to waves or the like is greater at the bow or stern than at the center portion, the buried machine 20 is pulled from the stern of the laying barge 110 as described above. Then, the influence of the shaking of the laying barge 110 becomes large, and it becomes difficult to control the position of the burying machine 20, and the accuracy of the burying position of the cable 3 decreases.

When the traction wires 121 and the anchor wires 119, 119,... Are extended into the water from the deck of the laying barge 110 as described above, the water surface S is widened by the traction wires 121, the anchor wires 119, 119,. Occupied across, hindering the navigation of other ships. Also, since the inclination angle α of the pulling wire 121 is large, the lift acting on the burying machine 20 is large, and the inclination angle θ of the anchor wires 119, 119,... Is large, so that the anchors 119a, 119a,. There are problems such as becoming.

In view of the above problems, the present invention can reduce the influence of shaking due to waves or the like, improve the accuracy of the cable burying position, and reduce the area occupied by the water surface to reduce the occupation area of other ships. An object of the present invention is to provide a method of burying a submarine cable that can prevent hindrance to navigation.

[0007]

According to the first aspect of the present invention, the laying barge is navigated on the water, and the laying machine is towed by the laying barge via the traction wire so as to move the burying machine at the bottom of the water. In the method of burying cables in the underwater cable burying method in which the cable stored in the cable storage device on the ship is drawn out into the water by the cable feeding device on the laying boat and the cable is buried in the water bottom while excavating the bottom with the burying machine, It is configured to extend into the water from the bottom of the hull near the center.

According to the first aspect of the present invention, the influence of the sway of the laying barge due to waves or the like can be obtained by extending the towing wire for pulling the buried machine from the center of the hull of the laying barge into the water. Relatively small, the position control of the burying machine becomes easy, and the accuracy of the burying position of the cable can be improved. In addition, by extending the towing wire from the bottom of the hull of the laying barge into the water, the area occupied by the water surface can be reduced to prevent hindrance to navigation of other ships, etc. And the lift acting on the burial machine can be reduced.

According to a second aspect of the present invention, an opening for operating a towing wire is provided at a portion near the center of the hull of the laying barge so as to penetrate the bottom of the hull, and the towing wire is connected to the opening for operating the towing wire. It is configured to extend into the water from the bottom of the hull through the section. According to the second aspect of the invention, by providing the wire operation opening in the hull of the laying barge, the towing wire can be easily extended from the bottom of the hull of the laying barge into the water.

According to a third aspect of the present invention, an anchor wire operating opening penetrating the bottom of the hull is provided in the hull of the laying barge, and the anchor wire is passed through the anchor wire operating opening. The laying barge is configured to extend into the water from the bottom of the hull. According to the third aspect of the present invention, by extending the anchor wire into the water from the bottom of the hull of the laying barge, the area occupied by the water surface is reduced, thereby preventing other ships from hindering navigation. In addition, the inclination angle of the anchor wire can be reduced to improve the effectiveness of the anchor.

[0011]

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 of burying a submarine cable according to an embodiment of the present invention, and FIG. 2 is a plan view showing a state of shaking of the laying barge in FIG. 1 due to waves or the like. .

As shown in FIGS. 1 and 2, a laying barge 1 used in a method for burying a submarine cable according to an embodiment of the present invention.
Numeral 0 is provided with a hull 11 that floats on the water, and is configured to be able to sail on the water. In the central portion of the hull 11, that is, in a portion closer to the center of gravity of the laying barge 10 than the stern or bow, a cable input opening 12 also serving as a wire operating opening moves the hull 11 from the deck to the bottom of the ship. It penetrates up and down, and is formed so as to be surrounded by the front, rear, and both lateral portions of the hull 11 in front, rear, left and right.

On the deck of the hull 11, a cable accommodating device 13 such as a turntable is provided so as to accommodate the coiled cable 3.
A cable feeding device 14 such as a caterpillar type (crawler type) braking device is installed on a deck above a deck or the like so as to feed out the cable 3 at a predetermined speed. Have been. Hull 1
Cable guide device 1 consisting of a sheave or the like on deck 1
5 is a cable housing device 1 without forcibly bending the cable 3
3 to cable feeding device 14, cable input opening 1
It is installed via a stand or the like so as to guide to 2.

On the deck of the hull 11, anchor wire operating devices 18, such as winches, are provided at predetermined positions on the front and rear sides of the cable insertion opening 12. It is provided to take up or unwind at a speed. The anchor wires 19, 19 ... extend from the bottom of the hull 11 into the water below the front of the slope and below the rear of the slope via the cable insertion opening 12, and anchor to the water bottom B in front and rear of the laying barge 10. 1
9a, 19a... Are fixed.

On the deck of the hull 11, a pulling wire operating device 16 composed of a winch or the like winds up the pulling wire 21 connected to the burying machine 20 at a position behind the cable input opening 12. Or, it is provided to unwind. Then, the towing wire 21 extends downward from the bottom of the hull 11 into the water through the cable insertion opening 12 and diagonally downwards into the water. Is configured to move on the water bottom B by being pulled by the laying barge 10 via the towing wire 21 and bury the cable 3 unreeled from the laying barge 10 in the water bottom B while excavating the water bottom B. ing.

In order to bury the cable 3 in the water bottom B by using the laying barge 10 and the burying machine 20, the laying barge 10
The front anchor wires 19, 19 are wound at a predetermined speed by the wire operating devices 18, 18, and the rear anchor wires 19, 19 are wound by the wire operating devices 18, 19.
The laying barge 10 is unwound at a predetermined speed, and the laying barge 10 is sailed on the water at a predetermined speed while controlling the position of the laying barge 10. Then, the burying machine 20 is moved at the same speed as the laying barge 10 on the water bottom B, the cable 3 is put into the water through the cable input opening 12, and the cable 3 is put on the laying barge 10.
The cable 3 is fed out at a predetermined speed by the cable feeding device 14 so as to correspond to the traveling speed of the boat, and the cable 3 is buried in the water bottom B behind the laying barge 10 while excavating the water bottom B by the burying machine 20.

At this time, the hull 11 of the laid barge 10 shakes due to waves or the like, but the hull of the hull 11 near the center becomes smaller than that of the bow or stern.
Therefore, the burying machine 20 is connected to the traction hull 21 through the cable input opening 12 at the center of the hull 11 of the laying barge 10.
, The influence of the sway of the hull 11 due to waves and the like is reduced as compared with the case of towing from the stern or the bow, the position control of the burying machine 20 becomes easy, and the burying accuracy of the cable 3 is improved. Can be improved.

Also, since the traction wire 21 and the anchor wires 19, 19 ... extend underwater from the bottom of the laying barge 10 through the cable introduction opening 12 penetrating the hull 11, the traction wire 21 and the anchor wires 19, 19 ... Anchor wire 1
The water surface S is not occupied over a wide area by 9, 19..., And it is possible to prevent the navigation of other ships from being hindered. In addition, since the inclination angle α of the pulling wire 21 is reduced, it is possible to prevent the lift acting on the burying machine 20 from being increased, and the inclination angle θ of the anchor wires 19 is reduced. 1
9a, 19a ... can be prevented from becoming ineffective. In addition, the traction wire 21 and the anchor wire 1
Similarly to 9, 19,... Occupation of the water surface S by the cable 3 can be prevented. In addition, the water surface S by the cable 3
Occupation of the cable 3 can be prevented by feeding out the cable 3 through the cable insertion opening 12 into the water.

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 case where the cable insertion opening penetrating the hull of the laying barge also serves as the wire operation opening has been described, but both may be provided separately. In addition, the cable housing device, the cable feeding device, the cable guiding device, and the like on the laying barge may be arranged in any manner as long as the cable can be fed underwater through the cable insertion opening.

[0020]

As described above, according to the first aspect of the present invention, the laying wire for pulling the burying machine is extended from the center of the hull of the laying barge into the water, whereby the laying due to waves and the like is performed. The influence of the shaking of the barge is relatively small, the position of the burying machine is easily controlled, and the accuracy of the burying position of the cable can be improved. In addition, by extending the towing wire from the bottom of the hull of the laying barge into the water, the area occupied by the water surface can be reduced to prevent hindrance to navigation of other ships, etc. And the lift acting on the burial machine can be reduced.

According to the second aspect of the present invention, by providing the opening portion for operating the towing wire in the hull of the laid barge, the towing wire can be easily extended from the bottom of the hull into the water. According to the third aspect of the present invention, by extending the anchor wire into the water from the bottom of the hull of the laying barge, the area occupied by the water surface is reduced, which may hinder navigation of other ships. Can be prevented, and the effect of the anchor can be improved by reducing the inclination angle of the anchor wire.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a state of shaking of the laying barge in FIG. 1 due to waves or the like.

FIG. 3 is an elevational view schematically showing a conventional method of burying a submarine cable.

FIG. 4 is a plan view showing a state of shaking of the laying barge in FIG. 4 due to waves or the like.

[Explanation of symbols]

 Reference Signs List 3 cable 10 laying barge 11 hull 12 cable input opening (wire operation opening) 13 cable housing device 14 cable feeding device 15 cable guide device 16 towing wire operation device 18 anchor wire operation device 19 anchor wire 19a anchor 20 burying Machine 21 Towing wire B Water bottom S Water surface

Claims (3)

[Claims] The laying barge is navigated on the water, and the laying barge is towed by a laying barge via a traction wire so as to move the burying machine at the bottom of the water. In the method of burying the cable in the water bottom while digging the water bottom by the burying machine and burying the cable in the water bottom by the cable laying device on the laying barge, the traction wire is connected to a center portion of the hull of the laying barge. A method of laying a submarine cable, wherein the submarine cable is extended from the bottom of the submarine into water. 2. An opening for operating a pulling wire penetrating the bottom of the hull at a portion near the center of the hull of the laying barge, and the towing wire is connected to the hull through the opening for operating the traction wire. The method of laying a submarine cable according to claim 1, wherein the submarine cable is extended from the bottom into the water. 3. An anchor wire operating opening penetrating the bottom of the hull is provided in the hull of the laying barge, and the anchor wire is submerged from the bottom of the hull through the anchor wire operating opening. The method of burying a submarine cable according to claim 1 or 2, wherein the cable is extended.