JP2002169067A - Composite aerial optical cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of composite aerial optical cable which houses a coated optical fiber tapes in all slot grooves provided in a slot. SOLUTION: The composite aerial optical cable is composed of an integration made by collectively covering with a layer 20 the main body 5 of an optical fiber cable, which is made by inserting a first metallic wire 2c through a slot 2 which houses the optical fibers (coated optical fiber tapes 3), and a suspending part which suspends the main body 5 and through which suspending part second metallic wires 10 are inserted. Electrically conductive channels are formed with a metallic wire provided in the main body 5 of the optical fiber cables and the metallic wires provided in the suspending part, and the coated optical fiber tapes are housed in all slot grooves 2a provided in the slot 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical composite overhead cable having functions of optical communication and transmission of electric power or electric signal.

[0002]

2. Description of the Related Art For example, when an amplifier or a modulator is inserted in the middle of a communication network constructed by optical cables or the like, it becomes necessary to supply power to the equipment. For this reason, a method of laying a conductive line separately from the optical cable, or housing the conductive line in the cable has been used. However, when a conductive line is laid separately from an optical cable, two cables are laid, so that there is a problem that cable costs and construction costs are doubled.

FIGS. 4A and 4B show an example of the structure of a conventional self-supporting optical composite aerial cable in which a conductive line is housed in a cable. FIG. 4A is a sectional view and FIG. 4B is a perspective view. The optical fiber cable used in this example has a round bar-shaped slot 2 in which a plurality of slot grooves 2a are spirally formed on the outer peripheral surface, and a large number of optical fibers housed in each slot groove 2a. A conductive line 26 composed of a copper wire 24 provided on the circumference with a tape core wire 3, two insulating sheaths 25 housed in a slot groove 2 b, and a press-winding layer 7 provided on the circumference of the slot 2 And a support member 10 which is a tension member in the case where the entire optical fiber cable is overhead-wired, is coated in parallel with one another, and these are integrated by a collective coating layer 20. The configuration is as follows.

The slot 2 is in the form of a long round bar made of a plastic such as polyethylene or polypropylene, and a tension member 2c is inserted through the center thereof. The tension member 2c is made of a metal stranded wire formed by twisting a plurality of metal wires, fiber reinforced plastic (FR
P), which is made of a string made of high-strength fiber such as aramid fiber, and bears the tensile strength of the optical fiber cable main body 8. Further, the support wire 10 used in this example needs to withstand the tension generated when the optical composite overhead cable is laid overhead, and a tensile strength material such as a galvanized steel twisted wire obtained by twisting a plurality of galvanized steel wires. It is configured using

[0005]

In the above-mentioned self-supporting optical composite overhead cable, the slot groove 2b is used for accommodating the conductive line 26 for transmitting electric power or an electric signal. Further, there is a problem that all the slot grooves cannot be used for storing the optical fiber ribbon. This leads to an increase in the outer diameter of the applicable slot in the optical composite aerial cable when compared with the same number of core wires, and there is a problem that the overhead wire condition including the wind pressure load is reconsidered when the aerial wiring is performed.

The present invention has been made in view of the above circumstances, and has as its object to provide an optical composite overhead cable having a structure in which optical fiber ribbons can be accommodated in all slot grooves provided in the slots.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the first aspect of the present invention, there is provided a main body in which a metal wire is inserted into a slot containing an optical fiber, and the main body is suspended. An optical composite aerial cable having a suspension wire portion through which a metal wire is inserted, wherein a conductive line is formed by a metal wire provided in the main body portion and the suspension wire portion. According to a second aspect of the present invention, there is provided an optical composite cable in which a conductive layer is provided on the periphery of an optical fiber cable in which a metal wire is inserted into a slot accommodating an optical fiber, wherein a conductive line is formed by the metal wire and the conductive layer. It was made.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 shows an embodiment of an optical composite overhead cable according to the present invention. In the figure, reference numeral 2 is a slot, 2a is a slot groove,
2c is a first metal wire, 3 is an optical fiber ribbon, 4
Reference numeral 5 denotes an optical fiber cable main body, 10 denotes a second metal wire, and 20 denotes a collective coating layer. The optical composite overhead cable of this embodiment is an optical fiber cable main body 5.
And the metal wire 10 are arranged side by side, and the coating is applied collectively, and the collective coating layer 20 integrates them.

The optical fiber cable main body 5 has a slot 2
And an optical fiber ribbon 3 and a presser winding layer 4. The slot 2 is a long round bar made of plastic such as polyethylene or polypropylene, for example.
The metal wire 2c is inserted therein. The first metal wire 2c plays a role of tensile strength of the optical fiber cable main body 5 and one of the conductive lines. A plurality of slot grooves 2 a are spirally formed on the outer peripheral surface of the slot 2. A plurality of optical fiber ribbons 3 are accommodated in these slot grooves 2a in a stacked state. In order to prevent the optical fiber ribbon 3 from dropping out of the slot groove 2a, a non-woven fabric tape or the like is wound around the periphery of the slot 2 to form a press winding layer 4. The second metal wire 10 functions as a support wire that bears the tension generated when the optical composite overhead cable is wired overhead, and also plays the other side of the conductive line.

The first metal wire 2 inserted into the slot 2
A conductive line for transmitting electric power or an electric signal is formed by c and the second metal wire rod 10 inserted through the suspension line portion. Each metal wire needs to satisfy both properties of conductivity and tensile strength, hard copper wire, hard copper stranded wire,
A copper alloy wire, a copper alloy stranded wire, an aluminum-coated steel wire, an aluminum-coated steel stranded wire, or the like is preferable.

The collective covering layer 20 covers the optical fiber cable main body 5 and the second metal wire 10 collectively, and can have the same configuration as that of a sheath of a general communication cable. The collective coating layer 20 is formed by, for example, using a thermoplastic resin such as polyethylene or polyvinyl chloride, arranging the metal wire 10 and the optical fiber cable main body 5 in parallel, and extruding and coating. The cross-sectional shape of the optical composite overhead cable obtained by integrating the metal wire 10 and the optical fiber cable main body 5 by the collective coating layer 20 can be appropriately designed. In this embodiment, it is formed in a gourd-shaped cross section as shown in FIG.

In this embodiment, the optical fiber cable main body 5
The optical composite overhead cable having a configuration in which the optical composite overhead cable and the second metal wire (supporting wire) 10 are integrated by the collective coating layer 20 has been described as an example, but the optical composite overhead cable having a pre-hanger structure as shown in FIG. (A) is a cross-sectional view and (b) is a perspective view. In this figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be simplified. The optical fiber cable 1 used in this example has a configuration in which a sheath 9 is coated on the periphery of an optical fiber cable main body 5. Also, the support wire 1 used in this example
Reference numeral 2 denotes a metal wire 10 covered with a sheath 11. The support wire 12 is inserted into one through hole of the plate-shaped hanger mold 30 having two through holes, and the optical fiber cable 1 is inserted into the other through hole. Line 12
And are integrated. This optical fiber cable 1 is
The support wire 12 is inserted into the hanger mold 30 with an extra length, so that the optical fiber cable 1 is in a slack state as shown in FIG. 2B. The conductive line for transmitting the electric power or the electric signal is configured such that the first metal wire 2c inserted into the inside of the slot 2 carries one, and the second metal wire 10 constituting the support wire 12 carries the other. I have.

In the above embodiment, an optical composite overhead cable has been described as an example, but the present invention is also applicable to an optical composite cable as described in the second aspect of the present invention. FIG. 3 shows an embodiment. In this figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be simplified. In the optical fiber cable 14 used in this example, the conductive layer 13 is provided on the periphery of the optical fiber cable main body 5, and
Further, a sheath 9 is coated on the periphery thereof.
The conductive layer 13 forms one conductive line carried by the first metal wire 2c inserted into the slot 2 and a conductive line for transmitting electric power or an electric signal as the other conductive line. The conductive layer 13 can be easily formed by horizontally or vertically winding a copper tape or an aluminum tape around the optical fiber cable main body 5.

[0014]

As described above, the optical composite overhead cable according to the present invention comprises a main body in which a metal wire is inserted into a slot containing an optical fiber, a hanging portion in which the main body is suspended, and a metal wire is inserted. An optical composite overhead cable having
The conductive line is formed by a metal wire material provided on the main body and the suspension line. Therefore, since the optical fiber ribbon can be accommodated in all the slot grooves spirally formed on the outer peripheral surface of the slot, the outer diameter of the slot is increased as compared with the conventional self-supporting optical composite overhead cable. Without this, the number of stored optical fiber tape cores can be greatly increased.

Further, since it can be manufactured by the same process and equipment as the conventional self-supporting optical composite overhead cable, the cost can be reduced by the increase in the number of stored optical fiber tape cores.

Further, if the optical fiber cable has a configuration in which a conductive layer is provided on the periphery of the main body, the number of stored optical fiber tape cores can be easily increased as compared with a conventional optical composite cable having the same structure. In addition, if the conductive layer is formed of a horizontally wound copper tape, implementation is easy in terms of equipment and technology.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an optical composite overhead cable according to the present invention.

FIG. 2 shows an example of an optical composite overhead cable having a pre-hanger structure according to the present invention, wherein (a) is a sectional view and (b) is a perspective view.

FIG. 3 is a sectional view showing an example of the optical composite cable according to the present invention.

4A and 4B show examples of a conventional self-supporting optical composite overhead cable, where FIG. 4A is a cross-sectional view and FIG. 4B is a perspective view.

[Explanation of symbols]

2 ... slot, 2a ... slot groove, 2c ...
First metal wire, 3 ... optical fiber tape core, 5
..The optical fiber cable body, 10... The second metal wire, 20.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H001 BB07 DD06 DD11 DD21 FF02 HH02 KK24 5G319 HA10 HB02 HC01 HD02 HD07 HE07 HE16 HE19

Claims (3)

[Claims] 1. A main body having a slot in which an optical fiber is accommodated, through which a first metal wire is inserted, and a suspending portion, through which the main body is suspended, through which a second metal wire is inserted, is provided. Optical composite overhead cable. 2. An optical composite cable comprising a metal wire inserted therein and a conductive layer provided on an outer peripheral portion of a slot in which an optical fiber is stored. 3. The optical composite cable according to claim 2, wherein the conductive layer is made of a horizontally wound copper tape.