JPH07308011A - Distribution cable unit incorporating optical fiber joint box and optical cable laying method - Google Patents

Abstract

PURPOSE:To perform the installation work and maintenance of an optical fiber joint box in safety by installing an optical fiber joint box, having bottom part inclining downward toward the front and an optical cable pull-in port in the bottom, while spacing apart from the bottom face of an outer box. CONSTITUTION:An optical fiber connecting section 4 has the bottom part inclining downward toward the front and spaced apart 2f from the bottom face of the outer box 2 for a distribution cable unit 1. Consequently, an optical cable 6 can be pulled from the bottom face of the outer box 6 and the bottom part of the optical fiber joint box 4 into the joint box 4 through an opening 2d in the outer box 2 for exclusive use. A series of works, including the work for leading out the optical cable 6 through an opening 2c in the front of the joint box 4 and through the opening 2d of the outer box 2, can be performed using only the opening 2d for exclusive use. This method ensures safety for the worker at the time of installation and the maintenance of the optical fiber joint box 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a power facility for a distribution cable in an outer box installed on the ground or on the floor, and an optical fiber connection box for an optical cable laid along the network of the distribution cable. For distribution cable equipment that has a built-in power supply, and for the optical fiber connection box in this distribution cable equipment, pulling in / out the optical cable,
The present invention relates to an optical cable construction method for performing a series of optical cable construction including terminal processing and the like.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for optical cables to be installed in networks of underground power distribution cables to control and monitor equipment for power distribution cables, perform automatic meter reading, or monitor electrical equipment. It's starting. As distribution cable equipment installed on the ground, there are multi-circuit switches, distribution boxes for supply, transformers, etc. However, when laying an optical cable in the network of underground distribution cables, the equipment outside these distribution cable equipment must be installed. An optical cable connection box is installed in the box. The optical fiber core wire of the installed optical cable is connected or branched to the optical fiber core wires of the control device, the monitoring device, etc. in the optical fiber connection box. It should be noted that the optical cable network is not limited to the above-mentioned monitoring of the distribution cable equipment and electrical equipment, and is being used for general information transmission systems.

In this type of conventional distribution cable equipment with a built-in optical fiber connection box, both the power equipment for the distribution cable and the optical fiber connection box for the optical cable face the front door of the outer box of the distribution cable equipment. It was supposed to be installed and installed.

[0004]

In the above-mentioned conventional distribution cable device, when a series of optical cable construction including optical fiber connection, insertion, terminal processing (branching, connection, etc.) is performed on the optical fiber connection box. Alternatively, when performing maintenance such as repair of the internal optical fiber connection portion and branching processing thereafter, those operations are performed by opening the front door. However, since the workers who perform the construction / maintenance of electric power equipment (electric power workers) and the workers who perform the construction / maintenance of the optical fiber junction box (optical communication workers) have different work contents, they are different. Since operators and optical communication workers are not familiar with electric power equipment in general, it is dangerous to construct and maintain an optical fiber junction box when the distribution cable is in a live state. Further, even if the optical fiber connection box is constructed in the power-off state, it is not preferable that the power equipment is exposed when there is nothing familiar with the power equipment. Therefore, for safety management, it is necessary for an electric power worker who is familiar with the handling of power distribution cables to witness the work of construction and maintenance of the optical fiber connection box.
That is complicated.

The present invention has been made in view of the above-mentioned conventional points, and it is possible to easily secure the safety of an operator without the need for a power operator to be present at the time of work such as construction and maintenance of an optical fiber connection box. It is an object of the present invention to provide a power distribution cable device having a built-in optical fiber connection box and an optical cable construction method.

[0006]

In order to solve the above-mentioned problems, the present invention according to claim 1 incorporates power equipment for distribution cables and an optical fiber connection box for optical cables in an outer box installed on the ground or on the floor. A device for power distribution cable with a built-in optical fiber connection box, wherein the outer box is provided with a main door provided in a main opening that enables work on the power equipment and a dedicated opening independent of the main opening. An optical fiber splicing box dedicated door is provided, and the optical fiber splicing box has a bottom that is inclined so as to have a downward slope toward the front surface with a lid, and has an optical cable lead-in port at the bottom and the optical fiber splicing box. It is characterized in that it is installed with a gap from the bottom surface of the outer box at a position facing the door for exclusive use of the junction box.

According to a second aspect of the present invention, in the power distribution cable device of the first aspect, the optical fiber connection box exclusive door is provided on a surface different from the surface on which the main door of the outer box is present.

According to a third aspect of the present invention, there is provided a distribution cable device having a built-in optical fiber connection box in which a power facility for the distribution cable and an optical fiber connection box for the optical cable are built in an outer box installed on the ground or floor. The outer box includes a main door provided in a main opening that enables work on the electric power equipment, and an optical fiber connection box exclusive door provided in a dedicated opening formed in a part of the main door. The fiber splicing box has a bottom that is inclined downward toward the front with a lid, has an optical cable entry port at this bottom, and faces the door for exclusive use of the optical fiber splicing box. It is characterized by being installed with a gap from the bottom surface.

A fourth aspect of the present invention is a method for constructing an optical cable in a device for power distribution cable with a built-in optical fiber junction box according to any one of the first to third aspects, wherein the door for exclusive use of the optical fiber junction box is opened and the optical cable is connected to the optical cable. The process of passing the optical cable from the bottom of the outer box to the inside of the optical fiber connection box through the optical cable inlet at the bottom of the optical fiber connection box, and pulling out the optical cable that has passed through the optical fiber connection box from the opening in the front of the optical fiber connection box. To pull out the optical cable from the dedicated opening of the outer box, to expose the drawn optical cable, to fix the tension member of the exposed optical cable to the optical fiber connection box, and to terminate the optical fiber core wire. The method is characterized by including a step and a step of closing the lid of the optical fiber connection box and then closing the door for exclusive use of the optical fiber connection box.

[0010]

In the above structure, the optical fiber splicing box is inclined so that its bottom portion is inclined downward toward the front surface and there is a gap with respect to the bottom surface of the outer box of the distribution cable device. It is possible to pull in the optical fiber connection box from the bottom surface of the optical fiber connection box and the bottom of the optical fiber connection box through the dedicated opening. Furthermore, the work of pulling out the optical cable from the opening on the front of the optical fiber connection box and the dedicated opening of the outer box, the opening of the optical cable, the terminal treatment (branching,
A series of operations related to the optical cable (such as connection) can be performed only from the dedicated opening. In this way, a series of work related to the optical cable such as construction and maintenance of the optical fiber connection box can be performed with the optical fiber connection box installed in the distribution cable device and without opening the main door. A communication worker can perform such work without fear of touching the power equipment inside the distribution cable equipment. Therefore, at the time of construction / maintenance of the optical fiber connection box, the safety of the optical communication worker is ensured even if electric power is supplied to the electric power equipment, and the witness of the electric power worker is not required.

When the main door for electric power equipment and the door for exclusive use of the optical fiber connection box are provided on different surfaces of the outer box of the distribution cable equipment as in claim 2, it is necessary to perform electric power work and optical communication work at the same time. In some cases, mutual work interference is small and mutual workability is not deteriorated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a power distribution cable device having a built-in optical fiber connection box according to the present invention. The power distribution cable device 1 of this embodiment is a multi-circuit switch for the underground power distribution cable 5, and a plurality of switches 3a for the ground power distribution cable 5 are provided inside the outer box 2 of the power distribution cable device 1. An optical fiber connection box 4 for an optical cable 6 laid along the network of the underground power distribution cable 5 is arranged together with the electric power equipment 3 including the above. FIG. 2 is a perspective view showing a state in which the distribution cable device 1 shown in FIG. 1 is on the handhole 7, and the underground distribution cable (omitted in FIG. 2) and the optical cable 6 are not shown in the figure due to a conduit or the like. Is introduced into the handhole 7 from the main power distribution line and is pulled inward from the bottom surface of the underground power distribution cable device 1. Then, the underground power distribution cable 5 is connected to the electric power equipment, and the optical cable 6 is directly routed inside the outer box 2 from the below-described lead-in port 22 of the optical fiber connection box 4 to the inside of the optical fiber connection box 4 without being routed. Have been attracted to.

As shown in FIGS. 1 and 2, the outer box 2 of the power distribution cable device 1 is provided with a main door 2a which is opened at the left and right and which is provided at a main opening 2c for allowing the power equipment 3 to work. The right side surface is provided with a dedicated door 2b for an optical fiber connection box provided in a dedicated opening 2d independent of the main door 2a. The opening of the main door 2a is the main opening 2c, and the opening of the optical fiber connection box exclusive door 2b is the exclusive opening 2c.
d. The optical fiber connection box 4 is arranged toward the right side surface of the outer box 2 so as to face the door 2b for exclusive use of the optical fiber connection box. And this optical fiber connection box 4
, Which will be described later in detail, has a bottom inclined toward the front and has an optical cable inlet at this bottom, and is installed with a gap from the bottom of the outer box 2. ing.

Details of the internal structure of the optical fiber connection box 4 are shown in FIG. The box body 20 of the optical fiber connection box 4 is
Although it has a generally rectangular parallelepiped shape, as described above, the bottom portion 20a descends toward the openable lid 20d side (the optical fiber connection box dedicated door 2b side of the power distribution cable device 1 in FIG. 1). The cable gland 23 is inclined so as to form a slope, and a cable gland 23 is attached to an inlet 22 formed in the inclined bottom portion 20a with an O-ring 24 interposed, and an optical cable 6 of the optical fiber connection box 4 is attached through the cable gland 23. It is pulled inside. The box body 20 is installed so as to have a gap 2f between the bottom portion 20a and the bottom surface 2e of the outer box 2 so that a hand can be put in to work. Reference numeral 18 is a duct for protecting the optical cable 6, reference numeral 4
Reference numeral 5 is a duct fixing portion for fixing the duct 18 to the outer box 2, and reference numeral 20e is a packing.

An optical cable 6 drawn into the optical fiber connection box 4 and an optical cable 6'branched inside.
The tension members 6a and 6'a are fixed to the box body 20 by tension member fixing jigs 27 and 42 fixed to the back wall 20b of the optical fiber connection box 4. The branched optical cable 6'is pulled out from the cable gland 43 provided on the upper surface portion 20c of the box body 20, and is used for on / off control and monitoring of each switch in the power distribution cable device 1.

Further, in the optical fiber connection box 4, there is accommodated an extra length storage tray 38 for accommodating the extra length portion of the optical fiber core wire 6b drawn from the optical cable 6 and a branching unit 39 for branching the optical fiber core wire. is doing. The extra length storage tray 38 and the branch unit 39 are rotatably hinged to the front side through a tray support frame 41 to a tray base 40 fixed to the box body 20, and as shown by the solid line in the figure,
It is configured such that it can be accommodated in the box body 20 in parallel with the rear wall 20b of 0, and can be in a posture in which it is tilted to the front side of the box body 20 as shown by a chain double-dashed line. For the work of the optical fiber connection box 4, the lid 20d is opened and the tray support frame 41
At the same time, the extra length storage tray 38 and the branching unit 39 are tilted to the front side as indicated by the two-dot chain line.

Explaining the work of pulling in the optical cable 6 into the optical fiber connection box 4, exposing the optical fiber, and performing terminal treatment, first, the main door 2a is closed and the optical fiber connection box dedicated door 2b is opened. Then, the optical cable 6 is pulled up from the bottom surface 2f of the outer box 2 of the power distribution cable device 1 by the work from the exclusive opening 2c of the optical fiber connection box exclusive door 2b, and the bottom portion 20a of the box body 20 of the optical fiber connection box 4 is directly as it is. It is drawn into the optical fiber connection box 4 through the drawing port 22 and is further pulled up and drawn out from the exclusive opening 2d of the outer box 2 by, for example, about 1.5 meters. in this case,
Since the bottom portion 20a of the optical fiber connection box 4 is inclined so as to be a downward slope toward the front surface, and has a gap 2f with respect to the bottom surface 2e of the outer box 2 of the power distribution cable device 1,
The above operation can be performed only by opening the door 2b dedicated to the optical fiber connection box.

After the tip of the optical cable 6 is brought out of the dedicated opening 2d, the sheath of the optical cable 6 is peeled off, and the tension member 6a and the spacer are cut to a predetermined length leaving only the optical fiber core wire 6b. Then, the tension member 6a is fixed by the tension member fixing jig 27. The optical fiber core wire 6b taken out from the optical cable 6 is branched in the branching unit 39, or the extra length portion is connected and stored in the extra length storage tray 38. After that, the lid 20d of the box body 20 is closed, and the door 2b for the optical fiber connection box of the outer box 2 is closed, whereby the optical cable construction is completed.

Also, when the optical cable 6 is once connected to the optical fiber connection box 4 as described above, and the terminal processing such as branching and connection of the optical fiber core wire 6b of the optical cable 6 is performed for maintenance or the like, the same applies. Only the optical fiber connection box exclusive door 2b is opened, the lid 20d of the optical fiber connection box 4 is opened, and the extra length storage tray 38 and the branch unit 39 are tilted to the front side.

When the optical communication worker carries out the construction and maintenance work of the optical fiber connection box 4 as described above, the optical communication worker does the work only for the optical fiber connection box without opening the main door 2a. It can be performed only by opening the door 2b, and the work can be performed without fear of touching the power equipment 3.
Therefore, even if power is supplied to the power equipment 3, the safety of the optical communication worker is ensured without the need for the power worker to be present. Further, when the electric power worker performs the construction and maintenance of the electric power equipment 3, there is no possibility that the electric power worker touches the optical fiber connection box 4. The optical fiber connection box 4 does not have any particular safety problem, but the optical fiber connection box 4 is not always damaged when the electric power equipment 3 is operated. It is preferable that both are separated.

Further, the structure in which the door 2b for exclusive use of the optical fiber connection box is provided on the side surface of the outer box 2 as in the embodiment, when the power work and the optical communication work need to be performed at the same time, the mutual work interferes with each other. Therefore, it is appropriate in this respect as well because they do not reduce the workability of each other.

FIG. 4 shows another embodiment. The power distribution cable device 1'of this embodiment is provided with a small door 2'b for exclusive use of the optical fiber connection box on the right side surface of the outer box 2'as opposed to the size of the entire right side surface as described above. The main door 2'a on the front of the outer box 2'is the same as above. In this embodiment, the door 2'b for exclusive use of the optical fiber connection box has a minimum size necessary for the operation of the optical fiber connection box 4, but it is functionally similar to the above.

FIG. 5 shows still another embodiment. In the power distribution cable device 1 "of this embodiment, a main door 2" a for electric power equipment having a width narrower than the entire front is provided on the front of the outer box 2 "and adjacent to the main door 2" a. Similarly, a small independent optical fiber splicing box door 2 "b is provided on the front surface. The optical fiber splicing box door 2" of this embodiment is also provided.
b is also functionally similar to the above.

FIG. 6 shows an embodiment of the equipment for distribution cable of claim 3. Power distribution cable device 41 of this embodiment
Is a distribution box for supply, and the electric power equipment 4 is provided inside the outer box 42.
3 and an optical fiber connection box 44. A double-opening main door 42a is provided on the front surface of the outer box 42 for enabling work on the electric power equipment 43, and a small window 42c is provided in a part of the main door 42a. 42b is provided. The optical fiber connection box 44 has a door 42b for exclusive use with the optical fiber connection box.
It is installed to face.

In the power distribution cable device 41, when the optical fiber connection box 44 is to be constructed and maintained, the optical communication worker only has the optical fiber connection box exclusive door 42b provided as a small door in a part of the main door 42a. When opened, the work of the optical fiber connection box 44 can be performed without fear of touching the power equipment 43. Therefore, the safety of the optical communication worker is secured as in the above.

It should be noted that the electric power worker may
When performing maintenance, the optical fiber connection box 44 is exposed, but the optical fiber connection box 44 does not pose a safety problem, so there is no problem.

[0027]

EFFECTS OF THE INVENTION According to the present invention, a series of operations relating to an optical cable such as pulling in, tapping, branching, and connection of the optical cable can be performed in a state where the optical fiber connection box is installed in the equipment for distribution cable, and moreover, Those work 1
It can be easily done by simply opening the dedicated door for the optical fiber connection box. Therefore, optical cable construction and maintenance work can be performed without opening the main door, and optical communication workers can work on the optical fiber junction box without fear of touching the power equipment inside the distribution cable equipment. . Therefore, even if power is supplied to the power equipment,
The safety of optical communication workers is ensured without the need for witness of electric power workers.

When the main door for electric power equipment and the door for exclusive use of the optical fiber connection box are provided on different surfaces of the distribution cable equipment as in claim 2, it is necessary to perform electric power work and optical communication work at the same time. In addition, there is little interference of mutual work and mutual workability is not deteriorated.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a device for a distribution cable according to the invention of claim 1. FIG.

FIG. 2 is a perspective view showing the power distribution cable device of FIG. 1 together with a handhole.

FIG. 3 is a cross-sectional view showing an internal structure of an optical fiber connection box in the power distribution cable device of FIG.

FIG. 4 is a perspective view of a main part showing another embodiment of the power distribution cable device according to claim 1;

FIG. 5 is a perspective view showing still another embodiment of the power distribution cable device according to claim 1.

FIG. 6 is a perspective view showing an embodiment of a device for distribution cable according to the invention of claim 3;

[Explanation of symbols]

 1,41 Distribution cable equipment 2,42 Outer box 2a, 42a Main door 2b, 42b Optical fiber connection box dedicated door 42c Small window 3,43 Electric power equipment 4,44 Optical fiber connection box 5 Distribution cable 6 Optical cable

Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location H02B 1/20 Z (72) Inventor Akihiro Shimizu 1-5-1 Kiba, Koto-ku, Tokyo Within Fujikura Ltd. (72) Inventor Toru Wada 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Stock Company (72) Inventor Masakazu Kumagai 1440 Fujikura Sakura City, Chiba Prefecture Sakura Factory (72) Inventor Katsuhiko Ito Tokyo 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Electric Power Company (72) Inventor Koji Kunizu 1-7-1, Yurakucho, Chiyoda-ku, Tokyo Toko Denki Co., Ltd. (72) Inventor, Mitsufumi Matsuda Chiyoda, Tokyo 1-7-1 Yurakucho, Tokyo Toko Electric Co., Ltd.

Claims (4)

[Claims] 1. A power distribution cable device having a built-in optical fiber connection box, wherein a power facility for the power distribution cable and an optical fiber connection box for the optical cable are built in an outer box installed on the ground or on the floor. The box includes a main door provided in a main opening that enables work on the electric power equipment, and an optical fiber connection box dedicated door provided in a dedicated opening independent of the main opening. , With a bottom that is inclined so as to descend toward the front with a lid, has an optical cable entry port at this bottom, and faces the bottom of the outer box at a position facing the door for exclusive use of the optical fiber connection box. Equipment for power distribution cables with a built-in optical fiber connection box, which is installed with a gap. 2. The power distribution cable with a built-in optical fiber connection box according to claim 1, wherein the door for exclusive use of the optical fiber connection box is provided on a surface different from the surface on which the main door of the outer box is present. machine. 3. A power distribution cable device having a built-in optical fiber connection box, wherein power equipment for the power distribution cable and an optical fiber connection box for the optical cable are built in an outer box installed on the ground or floor. The box includes a main door provided in a main opening that enables work on the electric power equipment and an optical fiber connection box dedicated door provided in a dedicated opening formed in a part of the main door. Has a bottom inclined toward the front with a lid, has an optical cable entry port at this bottom, and faces the bottom of the outer box at a position facing the door for exclusive use of the optical fiber connection box. It is a device for power distribution cable with a built-in optical fiber connection box, which is installed with a gap. 4. A method for constructing an optical cable in a device for power distribution cable with a built-in optical fiber connection box according to claim 1, wherein the door for exclusive use of the optical fiber connection box is opened, and the optical cable is attached to the outer box. Passing the optical cable through the optical fiber connection box from the bottom through the optical cable inlet at the bottom of the optical fiber connection box, and pulling out the optical cable that has passed through the optical fiber connection box from the opening on the front of the optical fiber connection box Of pulling out the optical cable from the above-mentioned dedicated opening, exposing the extracted optical cable, fixing the tension member of the exposed optical cable to the optical fiber connection box, and performing terminal treatment of the optical fiber core wire, A step of closing the lid of the optical fiber connection box and then closing the door for exclusive use of the optical fiber connection box. Optical cable construction method for built-in power distribution cable equipment.