JPH11187529A - Method of attaching half-split protective pipe to submarine cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach half-split protective pipes to a submarine cable efficiently on a cable ship and reduce the laying cost of the submarine cable. SOLUTION: Free rollers 5 which support a cable 2 fed onto a conveyance route by caterpillar rings 3 are made to descend by a vertical lifter 6. Half- divided protective pipes 10 are put on the cable 2 above the free rollers 5 and fixed to the cable by tightening with titanium bands 11, and the cable 2 is laid in a sea through a stern shooter 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a half-protection pipe on a submarine cable, in which a half-protection pipe is mounted on a cable when laying a submarine cable.

[0002]

2. Description of the Related Art A submarine cable is usually buried under the sea floor, but is laid underwater when the water depth is deep or when there is a bedrock or the like and a burying machine cannot be used. But,
If the submarine cable is laid in the sea as it is, there is a risk of external damage due to the anchor of the fishing boat or the like and tidal current corrosion (electric corrosion) occurring on the armored wire.

Therefore, conventionally, when a submarine cable is not buried in the seabed, a metal half-protection pipe is attached to the cable and laid. A half-protection pipe is a half-length pipe with a length that is slightly larger than the cable, and is cut in half along the axial direction. Is to be mounted.

[0004]

Conventionally, however, divers have been working to attach a half-protection pipe to a cable underwater, so that the work efficiency is poor. In particular, submarine cables are laid in places where the water depth is deep. In such a case, since the working time of the diver is limited, there has been a problem that the working efficiency is significantly reduced and the installation cost is too high. Further, when the water depth is too deep or in a place where the tide is fast, there is a problem that the work itself by the diver cannot be performed.

The present invention has been made in view of the above circumstances, and a half-protection cable for a submarine cable, in which work efficiency can be improved and costs can be reduced by installing a half-protection pipe on a cable on a ship or the like. It is intended to provide a tube mounting method.

[0006]

According to a first aspect of the present invention, there is provided a method of mounting a half-protection pipe on a submarine cable, wherein the cable placed on the laid ship is sequentially sent out onto a transport path by an endless track ring.
A step of lowering the support placed on the transport path of the cable by a lifting lifter, covering the cable above the support with a half protection pipe from above and below, and raising the support by the lifting lifter to lower the lower half of the support. A step of supporting the split protection pipe, a step of fastening a band to the half protection pipe covered on the cable, and a step of fastening the band and throwing the cable with the half protection pipe attached into the sea. It is characterized by the following.

According to the first aspect, since the cables sent out by the endless races are sequentially supported on the transport path,
When the free roller is lowered by the elevating lifter, the cable on the free roller floats in the air, and the half protection pipe can be sandwiched from above and below and easily covered. Then, after attaching a band to this half-protection pipe and attaching it to the cable, it is put into the sea, so that the half-protection pipe can be efficiently attached on the laying ship and the submarine cable can be laid. become.

According to a second aspect of the present invention, in the method for mounting a half-protection pipe on a submarine cable, the half-protection pipe is made of a synthetic resin having flexibility.

According to the second aspect of the present invention, since the half-protection pipe made of a synthetic resin having flexibility is used, the cable to which the half-protection pipe is mounted can be laid underwater through a curved shooter or the like. become able to.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 show an embodiment of the present invention. FIG. 1 is a side view showing a method for installing a half-protection pipe for a submarine cable, and FIG. FIG. 3 is a partial side view showing the operation when the lifter is lowered, FIG. 3 is a perspective view of a half protective tube attached to the cable, and FIG. 4 is a front view in vertical section showing the operation when attaching the half protective tube to the cable. 5
Fig. 6 is a partial side view showing an operation when the half protective tube is fitted in the half protective tube mounting method, Fig. 6 is a longitudinal sectional front view showing an operation when the titanium band is fastened to the half protective tube, and Fig. 7 is a half sectional view. FIG. 8 is a partial side view showing an operation after the half-protection pipe is mounted in the half-protection pipe mounting method.

The submarine cable laying boat 1 of the present embodiment comprises:
As shown in FIG. 1, the long cable 2 is sequentially sent out to the stern side by the endless race ring 3, and is put into the sea through the stern shooter 4 so that the cable is laid. The cable 2 is, for example, a submarine cable for supplying power to a small island or connecting a communication (metal communication, optical communication) line or the like. The cable 2 is previously wound and mounted on a bow side (not shown) of the laid boat 1, and once pulled up from here, is lowered along a slope and is sequentially pulled out by the endless track ring 3. . The endless race ring 3 sequentially sends out the cable 2 to the stern side between the circulating race rings, and also plays a role of a brake that applies a brake to this sending out. The stern shooter 4 gradually guides the cable 2 sent out in the horizontal direction by a large number of rollers arranged in a substantially arc shape, and throws the cable 2 into the sea.

On the transport path from the endless track ring 3 to the stern chute 4, two free rollers 5 as a longitudinal multipoint support for the cable 2 are arranged. The free roller 5 has a plurality of rollers arranged in parallel, thereby sequentially supporting and passing the cables 2 sent out from the endless race rings 3, and guiding the cables 2 to the stern shooter 4.
These free rollers 5 are respectively mounted and fixed on a lifting lifter 6. The elevating lifter 6 is a transport member that can move the free roller 5 up and down by the rotation of a motor (not shown). Note that a roller with a drive mechanism or a braking mechanism may be used instead of the free roller, or a low friction multipoint support may be used instead of the roller.

Above the free roller 5, a frame 7 is provided. A plurality of spring balancers 8 are attached to the ceiling of the frame 7, and a bind tool 9 is hung at the lower end of a wire 8 a drawn from each of the spring balancers 8. Binding tool 9
Is a tool for fastening the titanium band 11 by an air motor. The spring balancer 8 is a device that pulls up the binding tool 9 upward by a mainspring spring. The spring balancer 8 pulls the binding tool 9 upward with a constant force irrespective of the length of the wire 8a pulled out.

FIG. 2 shows a method for installing a half-protection pipe according to this embodiment.
First, the free roller 5 is lowered by the lift 6. Then, the cable 2 sent out from the endless race ring 3 is supported by the rollers of the stern shooter 4, and
It is in a state of floating above the free roller 5. Therefore, an operator attaches the cable 2 to the cable 2 from above and below.
Put 0 in between. When the cables are laid in multiple bundles, a half-protection pipe 10 is placed from outside of the cable bundle.
To cover.

As shown in FIG. 3, the half protection pipe 10 has a shape in which a cylinder having a predetermined length that is slightly larger than the outer diameter of the cable 2 is split in half along the axial direction. Made of a synthetic resin such as polyurethane. Each of these half protection pipes 10 is provided with an inner fitting portion 10a having a slightly thinner outer diameter at one end, and an outer fitting portion 10b having a slightly larger inner diameter at the other end. The inner fitting portion 10a and the outer fitting portion 10b of the half protective tube 10 adjacent in the longitudinal direction above and below the cable 2 are respectively overlapped. The upper and lower half protection tubes 10 are overlapped so that the joints connected in the longitudinal direction are alternately staggered. In addition, as shown in FIGS. 3 and 4, each half protection pipe 10 has a plurality of projections 10c formed on one surface corresponding to a cut surface when the tube is split in half, and the other surface. A plurality of holes 10d are formed on the cable 2 by fitting the respective projections 10c of the half protection pipes 10 into the respective holes 10d of the half protection pipe 10 facing up and down. The inner fitting portion 10a, the outer fitting portion 10b, the protrusion 10c, and the hole 10d are connected to the half protective tube 10
Is provided for ensuring positioning and overlapping when the cable 2 is put on the cable 2, and the present invention is not necessarily limited to these configurations.

When the half protection pipe 10 is put on the cable 2, as shown in FIG. 5, the free roller 5 is lifted by the lifting lifter 6 to support the lower half protection pipe 10. Then, the worker fastens these half protection pipes 10 with the titanium band 11 using the binding tool 9. In this fastening operation, as shown in FIG. 6, first, a titanium band 11 is turned around a half protection pipe 10 covering the cable 2, and both ends are formed into a ring by passing through a seal 11a. The titanium band 11 is cut into appropriate lengths in advance, and one end is provided with a seal 11a.
Can be used. Next, the titanium band 11 is set on the binding tool 9 and tightened by starting the air motor. The binding tool 9 can be pulled out from the spring balancer 8 and held at an arbitrary position by the operator pulling the wire 8a down by hand. Further, although the bind tool 9 has a weight of about 5 kg, the weight is almost canceled out by the spring balancer 8, so that there is no possibility that the load on the operator will be burdened. When the titanium band 11 is fastened by the binding tool 9,
As shown in FIG. 7, the upper and lower half protective tubes 10 are fastened to each other and securely attached to the cable 2.

In this manner, the cable 2 is connected to the half protection pipe 1
When 0 is mounted, as shown in FIG. 8, the cable 2 to which the half protection pipe 10 is not yet mounted is moved above the free roller 5 by feeding out by the endless race ring 3. Then, by repeating the above operation again, the half protection pipes 10 are sequentially mounted on the cables 2 to be introduced into the sea from the stern shooter 4. Further, since these half protection pipes 10 are made of a synthetic resin having flexibility and are curved along the rollers arranged in an arc shape of the stern shooter 4 together with the cable 2, the installation work can be performed smoothly. Can be.

As described above, according to the half protection pipe mounting method of the present embodiment, the cable 2 is connected to the rollers of the endless race ring 3 and the stern chute 4 by lowering the free roller 5 by the lifting lifter 6. The half protection pipe 10 can be easily put on the cable 2 because it can be suspended in the air. And
After the titanium band 11 is fastened to the half protection pipe 10 and then put into the sea via the stern shooter 4, the work of laying the submarine cable can be performed efficiently.

In the above embodiment, the case where the half protection pipe 10 is mounted while the endless race ring 3 sends out the cable 2 intermittently and stops is described. It is also possible to continuously send out while performing the mounting. In the above embodiment,
Although the case where the cable transport path is constituted by the endless track ring 3 and the stern chute 4 has been described, any transport path that sequentially supports and passes the cables 2 sent from the endless track ring 3 can be used.

Further, in the above-described embodiment, the case where the half-protective tube 10 made of a synthetic resin having flexibility is used has been described. However, when the cable 2 is put into the sea, a curved stern shooter 4 having an arc shape or the like is used. Is not used, it is also possible to use a half protection pipe 10 made of metal or the like. Also,
In the above embodiment, the case where the titanium band 11 is used has been described. However, the band is not limited to such a titanium band 11 as long as the band is made of a material having high corrosion resistance for fastening the half protective tube 10. Further, the lifting lifter 6 described in the above embodiment is not limited to the one driven by the rotation of the motor, and the bind tool 9 is not limited to the one driven by the air motor. Moreover, the fastening of the band can be performed manually using a normal tool or the like, without using the binding tool 9 having such a driving force.

[0022]

As is apparent from the above description, according to the method for installing a half-protection pipe for a submarine cable of the present invention, the half-protection pipe is efficiently mounted on a cable on a laid ship and put into the sea. Therefore, the cost of laying submarine cables can be greatly reduced.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a side view showing a method of installing a half-protection pipe for a submarine cable.

FIG. 2, showing an embodiment of the present invention, is a partial side view illustrating an operation of a lifting lifter when the protection lift pipe is lowered in a half protection tube mounting method.

FIG. 3, showing an embodiment of the present invention, is a perspective view of a half protective tube attached to a cable.

FIG. 4, showing an embodiment of the present invention, is a longitudinal sectional front view showing an operation when attaching a half protection pipe to a cable.

FIG. 5, showing one embodiment of the present invention, is a partial side view showing an operation when a half protection pipe is fitted in a half protection pipe mounting method.

FIG. 6, showing an embodiment of the present invention, is a longitudinal sectional front view showing an operation when fastening a titanium band to a half protection pipe.

FIG. 7, showing one embodiment of the present invention, is a perspective view of a cable to which a half protection tube is attached.

FIG. 8, showing one embodiment of the present invention, is a partial side view showing an operation after mounting a half-protection pipe in a half-protection pipe mounting method.

[Explanation of symbols]

 2 Cable 3 Endless track ring 4 Stern shooter 5 Free roller 6 Elevating lifter 9 Binding tool 10 Half protection pipe 11 Titanium band

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nobuyuki Motokoshi 3-7-1, Chibune, Nishiyodogawa-ku, Osaka-shi Mitsubishi Cable Industry Co., Ltd. Kansai Distribution Center (72) Inventor Norihiro Shiozaki Nishiyuki Higashikojima, Amagasaki City, Hyogo Prefecture 8 town, Mitsubishi Electric Wire Industry Co., Ltd.

Claims (2)

[Claims] 1. a step of sequentially feeding cables placed on a laying ship onto a transport path by means of endless track rings; a step of lowering a support disposed on the transport path of the cables by an elevating lifter; A step of covering the upper cable with a half-protection pipe from above and below, and raising the support with a lifting lifter to support the lower half-protection pipe; and a step of fastening a band to the half-protection pipe over the cable A method of attaching a half-protection pipe to a submarine cable, comprising the steps of: attaching a cable to which a half-protection pipe is attached by fastening a band into the sea. 2. The method according to claim 1, wherein the half-protection pipe is made of a synthetic resin having flexibility.