JPH09197183A - Optical cable with connector and its laying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical cable with a connector and its laying method capable of efficiently laying plural optical cables. SOLUTION: Two overhead optical cables 10, 10a of which terminals are opposed to each other are mutually coupled with a coupling headwater 28. Since plural overhead optical cables 10, 10a can be tractioned and laid similarly to one optical cable, laying length by one traction can greatly be increased and the working efficiency of laying the overhead optical cables 10, 10a can greatly be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical cable with a connector and a method for laying the optical cable.

[0002]

2. Description of the Related Art In laying an optical cable, there are various methods of pulling a tow metal fitting attached to the end of the optical cable with a winch or the like. For example, as shown in FIG.
When the optical cable 2 is installed between the piles 1 arranged in a plurality of rows on the ground, the tow rope 4 as the towing means connected to the winch 3 and the optical cable 2 are connected via the tow metal fitting 5, and the winch is connected. By driving 3 to wind up the tow rope 4, the optical cable 2 is unwound from the cable drum 6 installed in the pulling direction (rearward in the drawing), and the optical cable 2 is laid over the piles 1 in sequence. The towing bracket 5 is
By holding the optical cable 2, the pulling force of the pulling rope 4 is transmitted to the optical cable 2. Also,
The optical cable 2 is a so-called optical cable with a connector, and an optical fiber tape core wire (hereinafter, "tape core wire") is led out from a tip fixed to the pulling metal 5, and MT (Mechanically Transferabl
e) A connector (not shown) is mounted so that it can be optically connected to another optical cable via this MT connector after completion of pulling. These MT connectors are protected by being housed inside the tow metal fitting 5.
Even when laying optical cables in underground caves,
Generally, the optical cable is pulled by the pulling device such as the winch to be laid. Further, since the efficiency of laying decreases when the number of times of pulling is large, it is considered to save labor by using a long optical cable. In this construction method, the optical cable is towed by a caterpillar-type towing machine disposed at a plurality of locations along the path for laying the optical cable.

[0003]

By the way, in the case of the optical cable with a connector as described above, there is a limit to the reduction in the number of times of pulling due to the lengthening of the optical cable 2, and the work efficiency of laying is still unsatisfactory. . In addition, when laying a plurality of optical cables 2 having different numbers of cores, it is necessary to prepare a plurality of cable drums 6, and the installation place of the cable drums 6 becomes wide, which hinders securing the cables. There is a problem that the cost increases because it is necessary to prepare the tow metal fittings 5 according to the number of cores. Also, the rear end of the optical cable 2 in the pulling direction is assembled with the MT connector at the tip of the tape core wire led out at the site after the pulling is completed, and is optically connected to the tape core wire led out to the tip of another optical cable 2. In addition to the work, it takes time and effort to assemble the MT connector, which requires high precision, and there is also a problem that workability deteriorates.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an optical cable with a connector and a method for laying the same, by which a plurality of optical cables can be laid efficiently.

[0005]

The present invention has the following features to attain the object mentioned above. That is, in the optical cable with a connector according to claim 1, in the optical cable with a connector, which has a terminating terminal formed by terminating ends of a plurality of drawn out optical fibers with an optical connector, the terminating terminal has another connector. The means for solving the above-mentioned problems is that it is arranged so as to face the termination end of the optical cable and is connected so as to be able to be integrally pulled through a connecting tool.

A method of laying an optical cable with a connector according to a second aspect of the present invention is a method of laying an optical cable with a connector having a terminating end formed by terminating ends of a plurality of drawn out optical fibers with an optical connector. The terminal ends of the optical cables with a plurality of connectors are connected to each other by a connecting tool and wound around a cable drum, and the leading end of the leading cable with a connector is pulled so that the trailing end of the optical cable with a connector is pulled. The means for solving the above-mentioned problems is to continuously wind the optical cable with the connector connected to the termination terminal while unwinding it from the cable drum.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an optical cable with a connector according to the present invention will be described below with reference to FIGS. In the figure, the same components as those in FIG. 5 are designated by the same reference numerals to simplify the description. In the figure, reference numeral 10 is an optical cable with a connector (hereinafter referred to as "optical cable"), and 11 is a protective hose. The overhead optical cable 10 will be described below with reference to FIG. The aerial optical cable 10 is a so-called dharma type that is composed of a cable body 13 that accommodates a large number of tape core wires 12 and a messenger wire 14 that is arranged in parallel on one side of the cable body 13 and bears the tension acting on the cable body 13. It is a cable.

The protective hose 11 is made of a material having an appropriate elasticity such as polyvinyl chloride, and the overhead optical cable 1
The rear end of the cable body 13 separated from the messenger wire 14 by cutting the sheath 18 of 0 (left side in FIG. 1)
Is attached and the tape core wire 12 led out from the end of the cable body 13 and the MT connector 15 terminating the tape core wire 12 are housed and protected.
The front end of the protective hose 11 is arranged near the tip of the messenger wire 14. The protective hose 11 and the messenger wire 14 are arranged in parallel with each other. Both front and rear ends of the protective hose 11 are closed by caps 16 and 17 to stop water.

The cap 16 for closing the rear end (left side in FIG. 1) of the protective hose 11 is a ring-shaped member which is concentrically mounted on the end of the cable body 13,
It is fixed by a rear end and a fixing means (not shown).
Water between the cap 16 and the rear end of the protective hose 11 is stopped by a protective tape 19 wound around the outer side of the cap 16. The cap 17 for closing the front end of the protective hose 11 is
It is a ring-shaped member having a tapered front surface 20 that approaches the messenger wire 14 toward the front end side. A self-fusing tape 21 is wrapped around the front ends of the cap 17 and the protective hose 11, and the cap 17 and the protective hose 11 are wrapped.
Water-stopping property between and is maintained. Self-fusing tape 21
Is made of butyl rubber and is tightly fixed to the cap 17 and the protective hose 11 by being heat-shrinked after mounting, and further fixed by the tie wrap 22. It is designed not to come off even if it comes into contact with an object. The protective tape 19 and the self-bonding tape 21 are wound around the protective hose 11 including the messenger wire 14, and integrally fix the protective hose 11 and the messenger wire 15. Both caps 16 and 17 are made of a material having appropriate elasticity such as foamed polyethylene and are elastically deformed in response to the bending of the protection hose 11 at the time of towing and laying it, thereby maintaining the waterproofness of the protection hose 11. It is like this.

Inside the protective hose 11, a clamp member 23 for clamping the end of the cable main body 13 and holding it at a fixed position in the protective hose 11 and a tape core wire 12 led out from the end of the cable main body 13 are stably provided. An MT connector 1 that terminates the tape guide 24 that holds the tape core wire 12
A connector holder 25 for holding 5 and a surplus length storage portion 26 for accommodating the excess length of the tape core wire 12 while maintaining a bending radius larger than a prescribed radius are stored.

The tip of the messenger wire 14 separated from the cable body 13 projects forward from the front end of the protective hose 11 in the pulling direction, and is the same as the above-mentioned aerial optical cable 10 of another aerial optical cable 10a arranged opposite to each other. It is integrally connected to the messenger wire 14 of the terminal formed in 1 through a connecting hardware 28 (see FIGS. 2 and 3) so as to be able to be pulled. At the tip of the messenger wire 14, a pooling eye 33 for connecting with the connecting hardware 28 (connecting tool) is fixed.

The connecting metal piece 28 will be described below with reference to FIGS. 2 and 3. The connecting hardware 28 is formed by connecting five rod-shaped divided pieces 29 in series via a pin connection (not shown), and can be bent appropriately as shown by the chain line in FIG. It is possible to pass a gold wheel when the optical cables 10, 10a are towed. Suspending members 31 for suspending a weight 30 for stabilizing the orientation of the connecting metal piece 28 are attached to the split pieces 29 at the center and both ends. The hanging member 31 is
Each of the divided pieces 29 is rotatably supported by an axis line perpendicular to the longitudinal direction of the divided pieces 29 via a pin connection (not shown). Therefore, each suspension member 31 is rotated in a direction parallel to the split piece 29 as shown in the chain line in FIG. There is. Further, since the untwisting metal fitting 32 attached to one end of the connecting hardware 28 is rotatable, the rotation of one of the pair of aerial optical cables 10, 10a connected to both ends is twisted to the other. Not to give.

An embodiment of a method of laying an optical cable with a connector according to the present invention will be described below with reference to FIGS. 2 and 4. The method of laying an optical cable with a connector according to the present embodiment includes a plurality of overhead optical cables 10 and 10 having different numbers of cores.
First, both overhead optical cables 10, 10a are connected by a metal fitting 28 and wound around the cable drum 6, and the overhead optical cables 10, 1 at the front are connected.
The leading end of 0a is pulled and pulled out from the cable drum 6 and pulled out to the intended installation position. By doing so, all the aerial optical cables 10, 10a connected to the aerial optical cables 10, 10a continuously through the connecting metal article 28 are wound like a single cable. Can be issued. This time,
The connecting hardware 28 is arranged between the two columns 34 and in the vicinity of one column 34. Connecting hardware 28
Is appropriately bent and wound around the cable drum 6 together with the overhead optical cables 10 and 10a.

When the pulling process is completed, the connecting hardware 28
The messenger wires 14 of both aerial optical cables 10 and 10a are respectively fixed to the columns 34 adjacent to the column 34 arranged in the vicinity so that tension does not act on the coupling hardware 28, and the coupling hardware 28 is removed. The ends of the two overhead optical cables 10, 10a are torn apart to connect the messenger wires 14 to the columns 3 in the vicinity of the positions where the metal fittings 28 are arranged.
Fix to 4. At this time, both overhead optical cables 10, 10a
Connect the terminals of the cable main body 13 of
Keep it as close as you can wear it. Next, the protective hose 11 of the two overhead optical cables 10 and 10a is disassembled and removed, and the closure 35 is placed between the two cable bodies 13 that are brought close to each other.
Is attached, and the tape core wires 12 led out from the ends of the both cable main bodies 13 are connected by the MT connector 15. The closure 35 is hung and attached to the messenger wire 14 which is installed between a pair of columns 34 for installing the closure 35.

The operation and effect of this embodiment will be described below. According to the optical cable with a connector, the two aerial optical cables 10 and 10a whose terminals are opposed to each other are connected by the connecting hardware 28, so that the plurality of aerial optical cables 1
It is possible to pull and lay 0 and 10a in the same manner as a single optical cable, and the laying distance by one pulling is greatly extended, and the work efficiency of laying the aerial optical cable 10 is greatly improved. In addition, since the connecting metal piece 28 appropriately bends and does not get caught by the metal wheel or the like, and passes through the interference material almost in the same manner as the overhead optical cables 10 and 10a, it does not hinder the laying work.

According to the method of laying an optical cable with a connector, a plurality of aerial optical cables 10 and 10a are connected by a metal fitting 28 and wound around one cable drum 6, and the aerial optical cable 10 at the head is connected. 10a by pulling the tip ends of the aerial optical cables 10 and 10a.
Since the overhead optical cables 10 and 10a connected to each other are continuously laid out while being unwound from the cable drum 6 like a single optical cable, the laying distance by one traction is greatly extended, and the overhead optical cable 10 is laid. Work efficiency is significantly improved, and even if the number of cores of the optical cables 10 and 10a is different, the installation location of the cable drum 6 can be secured for one unit, and the work efficiency of installation can be further improved and the cost can be reduced. Is. Also, the tow metal is the overhead optical cable 1 at the top.
Since only one corresponding to 0, 10a is required, the cost can be reduced.

The optical cable with a connector and the method for laying the same according to the present invention can also be applied to a ground optical cable or the like.

[0018]

As described above, according to the optical cable with a connector of claim 1, an optical cable with a connector having a terminating terminal formed by terminating the ends of a plurality of drawn out optical fibers with an optical connector. In the above, since the terminating terminal is arranged so as to face the terminating terminal of another optical cable with a connector, and is connected so as to be integrally towable through a connector, a plurality of optical cables with a connector are similar to one optical cable. It has an excellent effect that the laying distance can be greatly extended by one pulling and the work efficiency of laying the optical fiber cable with the connector is greatly improved.

A method of laying an optical cable with a connector according to a second aspect of the present invention is a method of laying an optical cable with a connector having a terminating end formed by terminating ends of a plurality of drawn out optical fibers with an optical connector. The terminal ends of the optical cables with a plurality of connectors are connected to each other by a connecting tool and wound around a cable drum, and the leading end of the leading cable with a connector is pulled so that the trailing end of the optical cable with a connector is pulled. By laying out the optical cables with connectors connected to the termination terminals while continuously unwinding them from the cable drum, it is possible to lay out multiple optical cables with connectors as one optical cable while continuously unwinding them from the cable drum. As a result, the laying distance can be greatly extended by one pulling, and the work efficiency of laying the optical cable with connector can be improved. In addition to the significant improvement, it is possible to secure the installation place of the cable drum for one unit even when laying multiple optical cables with connectors with different numbers of cores, and it is possible to further improve the work efficiency of laying. In addition, it is possible to reduce the cost because only one towing metal fitting is required.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of an optical cable with a connector of the present invention.

FIG. 2 is a front view showing an embodiment of an optical cable with a connector according to the present invention.

FIG. 3 is a view showing an embodiment of an optical cable with a connector of the present invention, and is a front view showing a metal fitting.

FIG. 4 is a schematic front view showing an embodiment of a method of laying an optical cable with a connector according to the present invention.

FIG. 5 is an overall schematic view showing a conventional method of laying an optical cable with a connector.

[Explanation of symbols]

6 ... Cable drum, 10 ... Optical cable with connector (overhead optical cable), 10a ... Optical cable with connector (optical cable), 12 ... Optical fiber (tape core wire), 1
5 ... Optical connector (MT connector), 28 ... Coupling tool (coupling hardware).

Claims (2)

[Claims] 1. A plurality of derived optical fibers (12)
In an optical cable with connector (10, 10a) having a terminal end formed by terminating the end of the optical connector with an optical connector (15), the terminal end is disposed so as to face the terminal end of another optical cable with a connector, and a connector. An optical cable with a connector, which is integrally connected via (28) so as to be pulled. 2. A method of laying an optical cable with a connector, which comprises a termination terminal formed by terminating ends of a plurality of drawn out optical fibers with an optical connector, wherein the termination terminals of the plurality of optical cables with a connector are connected to each other. With a connector connected to a termination terminal at the rear end in the pulling direction of the optical fiber cable with a connector A method for laying an optical cable with a connector, which comprises laying an optical cable while continuously unwinding it from a cable drum.