JP2011254639A - Construction device and construction method for water bottom cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide construction device/method of a water bottom cable for reducing correction cost and shortening a correction period by preventing entanglement when a plurality of cables are constructed.SOLUTION: The construction device 2 is pulled by a construction work ship 1 and constructs the plurality of cables 3a to 3c on a water bottom. The device includes a plurality of guide members 20 which are arranged by leaving a prescribed cable construction interval p and guide the respective cables 3a to 3c in a construction direction, a separation member 21 separating the respective cables 3a to 3c to go to each of the guide members 20, and a supporting member 22 supporting the guide members 20.

Description

  The present invention relates to a laying apparatus in which, for example, a power cable, a communication cable, and the like are laid on a water bottom, and a laying method thereof.

  For example, when laying power, communication cables, etc. on the sea floor, the cable is routed along the target laying line by the laying device while pulling the laying device installed on the sea floor by a laying work ship that sails on the sea. (For example, refer to Patent Document 1). When laying a plurality of cables, the cables are laid in a state where the cables are arranged or stacked.

Japanese Patent Publication No.59-22443

  By the way, as described above, when a plurality of cables are laid in parallel or stacked, the cables are entangled with each other on the seabed, and excessive cable kinks are generated by supplying more cables than necessary. there is a possibility. As a result, if any cable is damaged due to an accident, it is not possible to pull up only the damaged cable for repair, and it is necessary to collect all the cables, which increases the repair cost and repairs. There is a problem that the period becomes longer.

  The present invention has been made in view of the above-described conventional situation, and by preventing entanglement when laying a plurality of cables, only damaged cables can be pulled up, repair costs can be suppressed, and repairs can be performed. It is an object of the present invention to provide a submarine cable laying device and a laying method that can shorten the period.

  The invention of claim 1 is a laying apparatus indexed by a laying work ship and laying a plurality of cables on the bottom of the water, arranged at predetermined cable laying intervals, and guiding each cable in the laying direction. It has a plurality of guide members, a separating member that separates the respective cables toward each guide member, and a support member that supports each guide member.

  According to a second aspect of the present invention, in the submarine cable laying device according to the first aspect, the guide member includes an introduction portion having a large-diameter portion disposed on the front side in the laying direction, and the introduction portion. And a linear guide portion connected to the small diameter portion following the large diameter portion.

  According to a third aspect of the present invention, in the submarine cable laying device according to the first or second aspect, the guide members are supported by the support member so that the cable laying interval can be adjusted.

  According to a fourth aspect of the present invention, a plurality of cables are separated by a separating member of the laying device while the laying device according to any one of the first to third aspects is indexed by a laying work boat, and each cable is connected to the guide member. And laying on the bottom of the water with a predetermined cable laying interval.

  According to the laying apparatus of the first aspect of the present invention, the cables are guided in the laying direction by the guide members arranged with a predetermined cable laying interval. As a result, the cables can be prevented from being entangled. As a result, when any of the cables is damaged due to an accident, only the damaged cable can be pulled up, and the repair cost can be reduced and the repair period can be shortened as compared with the case where all the cables are pulled up.

  In the invention of claim 2, since the guide member has the introduction portion having the large diameter portion and the linear guide portion connected to the small diameter portion of the introduction portion, the guide member is sent from the laying work ship. In addition, each cable can be easily and reliably introduced and guided to the guide member, and the laying workability can be improved.

  In the invention of claim 3, since the cable laying interval of each guide member can be adjusted, the laying interval can be arbitrarily set according to the flow of water, the shape of the water bottom, or the number of cables. Entanglement can be prevented more reliably.

  In the invention of claim 4, since the cables are laid on the water bottom with a predetermined cable laying interval by the guide member while the laying device is indexed by the laying work ship, the cables are laid without being entangled with each other. Thus, the same effect as in the first aspect can be obtained.

It is a schematic side view of the laying ship provided with the laying apparatus by Example 1 of this invention. It is a schematic plan view of the laying ship. It is a top view of the laying device. It is a side view of the laying device. It is a cross-sectional side view (VV line sectional view of FIG. 3) of the laying device. It is a cross-sectional front view (VI-VI line cross-sectional view of FIG. 3) of the laying device. It is a top view of the laying apparatus by the other example of the said Example.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 6 are views for explaining a submarine cable laying apparatus and a laying method according to Embodiment 1 of the present invention.

  In the figure, reference numeral 1 denotes a laying work ship that sails on the sea. The laying work ship 1 is connected to a laying device 2 installed on the seabed via tow wire ropes 5 and 4.

  The laying work boat 1 lays three cables 3a, 3b, 3c on the seabed via the laying device 2 by towing the laying device 2 along a target laying line. Although not shown, each of the cables 3a, 3b, and 3c is formed by covering a power transmission line, an optical fiber unit, or the like with a flexible exterior member.

  While the cloth work vessel 1 stabilizes the hull posture with respect to the flow of tide and transverse waves by a controller (not shown) that controls the propulsive force and propulsion direction of the propulsion device 6 disposed on the bottom of the hull 1a, It is configured to sail on the sea along the target laying line. Reference numeral 7 denotes a work building including a control room, a steering room, and a passenger room.

  Coils 8, 9, and 10 for holding the cables 3a, 3b and 3c in a wound state are mounted on the deck 1b of the hull 1a.

  Pass lines 11, 12, and 13 are provided above the coils 8 to 10 of the deck 1 b so as to send out the cables 3 a to 3 c fed from the coils 8 to 10 toward the stern.

  To the stern of the deck 1b, the cables 3a to 3c are transported and the transport control devices 14, 15, 16 for controlling the transport speed, and the cables 3a to 3c transported by the transport control devices 14 to 16, respectively. And a shooter 17 for sending them into the sea.

  The cables 3a to 3c sent out from the shooter 17 into the sea are inserted through a large number of guide cylinders 18 attached to the wire rope 5 connecting the laying work boat 1 and the laying device 2 with a predetermined interval. Therefore, it is supported by the guide cylinder 18.

  The laying device 2 is arranged with a predetermined cable laying interval p, and guides the cables 3a to 3c in the direction of the laying line, and the guide members 20 are laid on the laying side. A support member 22 that supports the space 3 at a distance and a separation member 21 that separates the cables 3a to 3c toward the guide members 20 are provided.

  The separating member 21 is configured to branch the cables 3 a to 3 c fed from the shooter 17 from the guide cylinder 18 positioned at the lowermost end and to insert and support the branched guide cylinders 19.

  Each guide member 20 has an introduction part 20a and a guide part 20b following the introduction part 20a. The introduction portion 20a has a funnel shape that expands forward in plan view, and includes a large diameter portion 20c disposed on the front side in the laying direction, and a small diameter portion 20d that follows the large diameter portion 20c. The guide portion 20b is connected to the small diameter portion 20d of the introduction portion 20a and extends rearward in a straight line shape.

  Each of the guide members 20 extends in the laying direction and is curved so as to protrude upward, and a pair of side wall parts 30 that extend in the laying direction and are fixed to the upper surface of the bottom wall part 29. , 30 and a guide roller 31 that is installed at a predetermined interval so as to connect the side wall portions 30, 30 and is rotatably supported, thereby forming a passage through which a cable can be inserted.

  Each bottom wall portion 29 is connected to three connecting portions 29b formed so as to extend in a direction orthogonal to the laying direction via a support member 29a. And each connection part 29b is bolted and fixed via the flange 29c.

  In this way, the guide member 20 is unitized, and the number of units of the guide member 20 is adjusted according to a change in the number of cables to be laid.

  The support member 22 has a gate shape in plan view, and is detachably bolted between a pair of leg portions 22a and 22a that are in contact with the seabed and a front end portion in the pulling direction of the leg portion 22a. And three support portions 22b having a divided structure. The left and right end portions of the connecting portion 29b of the left and right guide members 20 are bolted to the leg portion 22a.

  At the front end portion of each leg portion 22a, connecting tools 23, 23 connected to the wire rope 4 are attached, and one of the connecting tools 23 is provided with a pulling angle detector 24.

  The one leg portion 22a is provided with a water depth detector 25, a terminal box 26, and a speedometer 27. At the rear end of each leg portion 22a, the support member 22 is landed on the sea bottom. Detectors 28 and 28 for detecting the state are supported so as to be swingable up and down.

  The guide members 20 are arranged in parallel with a cable laying interval, and the connecting portions 29b are detachably bolted and connected, and the left and right end portions of the connecting portions 29b can be attached to and detached from the leg portions 22a. The connecting portions 29b located in the middle portions are assembled by being detachably bolted.

  While indexing the laying device 2 installed on the seabed by the laying work boat 1 along the target laying line, the cables 3a to 3c are separated by the separating member 21 of the laying device 2 and sent to the guide member 20, The cables 3a to 3c are laid on the seabed by the guide members 20 with the cable laying interval p.

  At this time, the positions of the cables 3 a to 3 c in the vertical and horizontal directions are regulated by the guide members 20. Restriction of the upward movement of each of the cables 3a to 3c is performed by a guide roller 31 that is rotatably supported.

  As described above, according to this embodiment, the cables 3a to 3c are guided along the laying line by the three guide members 20 arranged with a predetermined cable laying interval p. 3a-3c will be laid on the seabed with the said cable laying space | interval p, and can prevent the entanglement of cables. As a result, when any of the cables is damaged due to an accident, only the damaged cable can be pulled up, and the repair cost can be reduced and the repair period can be shortened as compared with the case where all the cables are pulled up.

  In this embodiment, the guide member 20 has the introduction portion 20a having the funnel-shaped large diameter portion 20c and the linear guide portion 20b connected to the small diameter portion 20d of the introduction portion 20a. The cables 3a to 3c sent from the laying work boat 1 can be easily and reliably introduced and guided to the guide member 20, and the laying workability can be improved.

  Further, since the guide roller 31 is rotatably attached to the guide member 20 and thereby the upward escape of the cable is restricted, the laying resistance can be reduced and the cable can be prevented from being damaged.

  In the above-described embodiment, the case where the cable laying interval p of each guide member 20 is fixed has been described as an example. However, in the present invention, each guide member may be supported by the support member in an adjustable manner. . In this case, each guide member is supported by the support member so as to be slidable in the cable laying interval direction.

  When the cable laying interval of each guide member can be adjusted in this way, the laying interval can be arbitrarily set according to the flow of water, the shape of the bottom of the water, or the number of cables. It can prevent more reliably.

  Moreover, although the case where the three cables 3a-3c were installed was demonstrated in the said Example, of course, it is also possible for this invention to lay two or four or more cables.

  FIG. 7 shows an laying apparatus in which four cables are laid. In this case, the support member 22b ′ is added to the support member 22 of the above embodiment, and four guide members 20 are provided. In this way, it is possible to easily cope with a change in the number of cables.

  In the above embodiment, the case where the laying work ship itself navigates has been described as an example. However, in the present invention, when navigating by towing by a tugboat, or when the anchor is driven forward in the laying direction and wound by a winch. This is also applicable when sailing.

DESCRIPTION OF SYMBOLS 1 Laying work ship 2 Laying apparatus 3a-3c Cable 20 Guide member 20a Introduction part 20b Guide part 20c Large diameter part 20d Small diameter part 21 Separation member 22 Support member p Cable installation interval

Claims (4)

A laying device indexed by a laying work boat and laying a plurality of cables on the bottom of the water,
A plurality of guide members arranged at predetermined cable laying intervals and guiding each cable in the laying direction;
A separating member for separating the respective cables toward the respective guide members;
A submarine cable laying apparatus comprising a support member for supporting each guide member. In the submarine cable laying device according to claim 1,
The guide member includes an introduction portion having a large diameter portion arranged on the front side in the laying direction, and a linear guide portion connected to a small diameter portion following the large diameter portion of the introduction portion. A submarine cable laying device. In the submarine cable laying device according to claim 1 or 2,
Each said guide member is supported by the said supporting member so that the said cable laying space | interval can be adjusted, The laying apparatus of the submarine cable characterized by the above-mentioned. While the laying device according to any one of claims 1 to 3 is indexed by a laying work boat, a plurality of cables are separated by a separating member of the laying device, and a predetermined cable laying interval is set for each cable by the guide member. A method of laying a submarine cable, characterized by being laid on the bottom of the water.

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