JPS6123105A - Optical fiber cable and its manufacture - Google Patents

Abstract

PURPOSE:To improve the compression resistance by arranging the 2nd cured FRP on the 1st half-cured FRP in a partial bite state, heating and curing the 1st FRP after the arrangement, and thus uniting the 1st FRP and the 2nd FRP together. CONSTITUTION:The 2nd FRP2 is wound by the 1st assembling die 8 while biting the 1st half-cured FRP1 and then heated by a heating device 9 to cure the 1st half-cured FRP1. Thus, the 1st and the 2nd FRPs 1 and 2 are united togethr and cooled by a cooling device 10 to obtain an FRP spacer. Then optical fiber 3 are sotred on the 1st FRP1 and between the 2nd FRPs 2 by the 2nd assembling machine 11 and a buffer layer 4 and a pressure wind tape 4a are supplied, so that an optical fiber cable unit 14 is taken up by a draw-up and take-up machine 12 through an assembling die 13. Then, the unit is covered with a sheath 5 in anothr process to obtain the FRP spacer type optical fiber cable having the 1st FRP1 and the 2nd FRP2 united together.

Description

DETAILED DESCRIPTION OF THE INVENTION [Background and Objects of the Invention] The present invention relates to an optical fiber cable and a method for manufacturing the same.

The progress of optical communication technology that takes advantage of the low loss and broadband properties of optical fibers has been remarkable, and the introduction and practical use of optical communication systems is progressing rapidly in various fields. development is also progressing rapidly. Conventionally, when determining the structure of an optical fiber cable forming an optical transmission line, various ideas and improvements have been made in consideration of the fragility of optical fibers. However, in recent years, as cables have become more multi-core, optical fiber cables have been required to be handled in the same way as conventional metal cables, whether overhead, underground, under the sea, or attached to power transmission lines. Therefore, there is a need to provide an optical fiber cable that is reliable after installation and installation.

In particular, when used as an overhead cable, side pressure (compressive force) and tensile force are applied to the optical fiber due to the straining action when it passes through a metal wheel during installation, which can cause the optical fiber to break. It is desired to develop optical fiber cables that are resistant to

As a countermeasure to this problem, the optical fiber cable is constructed as shown in FIG. In other words, as shown in the figure, the optical fiber cable consists of a first FRPl as a tension member, a second FRP2 provided on the outer periphery of the first FRPl at an arbitrary interval and twist pitch, and a first FRPl. F of
It is composed of optical fibers 3 disposed on the RPl and between the second FRPs 2, and a buffer layer 4 and an outer sheath 5 provided on the outer peripheries of these fibers. In addition,
In the figure, 4a is a presser winding tape. Although the second FRP 2, the buffer layer 4, etc. are provided in this way, they are not sufficient to withstand the compressive force.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an optical fiber cable and a method for manufacturing the same that can improve compression resistance.

[Summary of disuse] In other words, the present invention includes the first FRP of the tension member,
A second FRP provided on the outer periphery of the first FRP at arbitrary intervals and twist pitches, and optical fibers provided on the first FRP and between the second FRP, respectively;
Loosely provided to cover these! ! In the optical fiber cable comprising an i-layer and an outer sheath, the first F
The first feature is that the RP and the second FRP are integrated, and the first FRP of the tension member
A second FRP is provided on the outer periphery of the first FRP at arbitrary intervals and twist pitches, and optical fibers are respectively provided on the first FRP and between the second FRP. , a buffer layer and an outer sheath provided to cover these, the first F.
In order to integrate RP and the second FRP, the first F which is in a semi-cured state, and the second F which is cured on the RP.
The second feature is that R'P is placed with a part of it biting in, and after placement, the first FRP is heated and hardened, whereby the first FRP and the second FRP are separated. will become integrated.

[Example] Hereinafter, the present invention will be explained based on the illustrated example.
The figure shows an embodiment of the optical fiber cable, and FIG. 3 shows an embodiment of the manufacturing method thereof. In this embodiment, the same parts as those in the prior art are designated by the same reference numerals and the explanation thereof will be omitted. In this embodiment, the first FRP1 and the second FRP2 are integrated.

Then, to integrate, the first FRP is semi-hardened.
A part of the hardened second FRP 2 was placed on top of the first FRP 2, and after the placement, the first FRP 2 was heated and cured.

By doing this, the first FR Pl and the second FR
By being integrated with P2, it is possible to obtain an optical fiber cable and a method for manufacturing the same that can improve compression resistance.

That is, since the first FRP1 and the second FRP2 are integrated, the second FRP2 does not move even if lateral pressure is applied, so that lateral pressure is not directly applied to the optical fiber 3. Therefore, the compressive force resistance of the optical fiber cable can be improved.

To manufacture this optical fiber cable, we adopted the idea of a spacer-type cable that is resistant to compressive forces. This is a method in which a groove is formed in plastic or metal, and the optical fiber 3 is housed in this groove. By doing so, a structure is obtained in which no external force is directly applied to the optical fiber 3. That is, as shown in FIG. 3, a plurality of hardened second FRPs are placed on the outer periphery of the semi-hardened first FRP1, which is sent out from the sending device 6 and becomes a tension member, by the first collecting machine 7. FRP2 is wound at an arbitrary interval and pitch, and the second
The FRP 2 is wrapped around the semi-hardened first FRP 1 while keeping it bitten. Immediately after winding in this way, the first FRP 1 is heated by the heating device N9 to harden the first FRP 1 which is in a semi-hardened state. The second FRP 1 and 2 are integrated. Once integrated, it is cooled in the cooling device 10 and cooled. An FRP spacer is obtained in which the second FRPI, 2 is integrated. Next, the optical fiber 3 is housed in the groove of this FRP spacer, that is, on the first FRP 1 and between the second FRP 2 by the second collecting machine 11, and the 'buffer layer 4. A pressing winding tape 48 or the like is applied, and the optical fiber cable unit 14 is wound up by the take-up/winding machine 12 via the second collecting die 13 . After that, by covering the outer sheath 5 in a separate process, the first FRP1 and the second FRP1 are removed as shown in FIG.
It is possible to obtain an FRP spacer type optical fiber cable that is integrated with FRP2. In addition, in this case, the second
of FRP can be obtained. In this case, it is also possible to make an FRP spacer by heating and hardening the second FRP 2 and then to form an aggregate cable of the optical fibers 3 in a separate process.

Note that the first FRPl as the central tension member
The center may be made of metal wire or carbon fiber, etc.
Further, although FRP is used as the material to be wrapped around the outer periphery of the central tension member, it is not limited to this, and metal wire (including adhesive coating) may also be used.

Furthermore, in this embodiment, the first FRP 1 is in a semi-hardened state, but the present invention is not limited to this, and the second FRP 2 may be manufactured in a semi-hardened state.

[Effects of the Invention] As described above, in the present invention, compressive force is not directly applied to the optical fiber. The compressive force resistance of the optical fiber cable is improved, and it is possible to obtain an optical fiber cable and a method for manufacturing the same that can improve the compressive force resistance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an optical fiber cable according to a conventional optical fiber cable and its manufacturing method. FIG. FIG. 3 is a diagram showing the manufacturing method of one embodiment. 1... First FRP of tension member, 2... Second FRP, 3... Optical fiber, 4... Buffer Layer. 5... Outer sheath, 6... Delivery device, 7...
First collecting machine, 8... First collecting die, 9... Heating device. 10... Cooling device, 11... Second collecting machine. 12... Take-up/winding machine, 13... Second gathering die.

Claims (2)

[Claims] (1) A first FRP of the tension member, a second FRP provided on the outer periphery of the first FRP at an arbitrary interval and twist pitch, and a second FRP provided on the first FRP and the second FRP.
In the optical fiber cable, the first FRP and the second
An optical fiber cable characterized by being integrated with FRP. (2) A first FRP of the tension member, a second FRP provided on the outer periphery of the first FRP at an arbitrary interval and twist pitch, and a second FRP provided on the first FRP and the second FRP.
In the optical fiber cable, the first FRP and the second
In order to integrate the FRP with the FRP, the cured second FRP is placed on the first FRP which is in a semi-hardened state by biting a part of the second FRP, and after the placement, the first FRP is heated. A method for producing an optical fiber cable characterized by being cured.