JPH0414813Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the provision of a power cable containing a communication line, which incorporates a communication line such as an optical fiber.

[Conventional technology]

Conventionally, in a power cable, when attaching a communication line such as an optical fiber to the outside of the power cable core, an insulator 2 is placed on a conductor 1 as shown in FIG.
A concave groove 6a is carved in the rubber/plastic anti-corrosion layer 6 provided on the circumference of the cable core 5, which is constructed by sequentially providing a metal sheath 3 and a reinforcing layer 4 as necessary. A communication line 7 such as an optical fiber is housed, and in the case of laying on the seabed, a wire such as iron wire is placed on top of the anti-corrosion layer 7 via a wrapping layer 8a such as plastic tape and a seat 8b such as a jute. A serving 9 is given, and finally a serving 10 made of jujut or the like is given. (Please refer to Utility Model Application Publication No. 13414/1983 if necessary.) [Problems to be solved by the invention] According to such a power cable with communication line,
Due to external forces such as bending and torsion that are applied during cable manufacturing, installation, and afterwards, stress is concentrated at the groove-forming part of the anti-corrosion layer, and this groove-forming part is also known as an inflection point in rigidity. There was a risk that this would lead to a crack outbreak.

In view of the problems of the prior art described above, the present invention
The object of the present invention is to provide a power cable containing communication lines, which can maintain a predetermined anti-corrosion performance by reducing stress concentration in the anti-corrosion layer in which the communication lines are built.

[Means for solving problems]

The power cable with communication wires of the present invention, which was developed to achieve the above object, has slits arranged on both sides of the groove for storing communication wires in the anticorrosion layer provided on the power cable core. It is characterized by this.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained in detail with reference to FIG. 1.

The illustrated power cable is an oil-filled power cable for laying on the seabed, and the cable core 11 is as follows:
On a conductor 13 having an oil passage 12, an insulator 14 made of a wrapped insulating paper, a metal sheath 15 such as a lead sheath, and a reinforcing layer 16 as necessary are sequentially applied.

The present invention provides for such a cable core 11,
In the anti-corrosion layer 17 formed by extrusion molding of rubber/plastic material, a groove 19 for housing the communication line 18 is formed, and slits 20, 20 having a smaller width than the groove 19 are formed on both sides of the groove 19.
are arranged in a row.

On top of the anti-corrosion layer 17 in which the communication line 18 is housed in the groove 19, a cover 23 made of iron wire or the like is applied via a pressure wrapping layer 21 made of plastic tape wrapped around it or the like and a seat 22 made of jute or the like. ,
Furthermore, a serving 24 of jujut or the like is given.

Therefore, the slits 20 in the anti-corrosion layer 17 are formed in multiple rows, for example, three rows, and the width is gradually reduced as the distance from the groove 19 increases, so that the change in the degree of rigidity near the groove 19 can be made abrupt. It is best for making gradual changes.

[Effect of idea]

As explained above, the power cable with communication wires of the present invention has slits formed on both sides of the groove forming portion for storing communication wires in the anticorrosion layer provided on the power cable core. Because it becomes
The local concentration of stress that was seen in conventional grooves alone is eliminated, and the stress on both sides of the grooves is gradually relaxed, making it difficult for cracks to occur in the anti-corrosion layer due to external force. To provide a power cable with a communication line of this type which is highly safe and does not cause a deterioration in anti-corrosion performance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view showing one embodiment of a power cable with communication lines according to the present invention, and FIG. 2 is an explanatory cross-sectional view showing an example of a conventional power cable with communication lines. 11...Cable core, 12...Oil passage, 13
... Conductor, 14 ... Insulator, 15 ... Metal sheath, 16 ... Reinforcement layer, 17 ... Corrosion protection layer, 18 ...
Concave groove, 19...Communication line, 20...Slit, 21
...Temaki layer, 22...Zatoko, 23...Gaso, 24...Serving.

Claims (1)

[Scope of utility model registration request] A power cable with a communication line configured by providing a groove in the anti-corrosion layer of a power cable core and storing a communication line in the groove, characterized in that slits are arranged in rows on both sides of the groove in the anti-corrosion layer. Power cable with communication line.