JP2003279757A - Optical cable connection box and installation method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical cable connection box that can be easily installed in existing sewer facilities, and at the same time can improve working efficiency in drain maintenance, and to provide an installation method of the optical cable connection box. <P>SOLUTION: The optical cable connection box 1 has a cylindrical section 8 where a measure 2 is inserted, and has a connection box body 6 for accommodating the connection/branching section and the surplus length section of the optical cable taken from the inside of the measure 2. At the upper end of the connection box body 6, an annular lid 14 having a circular opening 15a is detachably provided, and an accommodation space 10 in the connection box body 6 is covered and blocked by the lid 14. The optical cable connection box 1 has an opening 16a for penetrating the measure 2 and has a body accommodation member 15 for accommodating the connection box body 6. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical cable splicing box for accommodating a splicing portion of an optical cable passing through the inside of a masu or a manhole of a sewerage system and a method of installing the optical cable splicing box.

[0002]

2. Description of the Related Art As an optical cable connection box for accommodating a connection portion of an optical cable arranged in a sewerage facility, for example, one attached to a manhole cover as described in JP-A-5-132961 or JP-A-9-55
As described in Japanese Patent Publication No. 93, the one installed inside the box is known.

[0003]

However, the above-mentioned prior art has the following problems. That is, in the one described in Japanese Patent Laid-Open No. 5-132961, it is necessary to newly manufacture a manhole cover integrated with the optical cable connection box. Also, when performing maintenance on the manhole (sewage), it is necessary to perform the work carefully so as not to damage the optical cable connection box when the manhole cover is removed.

Further, in the one disclosed in Japanese Patent Laid-Open No. 9-5593, there is a possibility that the optical cable splicing box cannot be installed inside the box if the box has a small diameter. Even if the optical cable connection box can be installed in the masu, the optical cable connection box becomes a hindrance during the maintenance of sewage, making it difficult to perform the work.

An object of the present invention is to provide an optical cable connection box and an installation method of the optical cable connection box which can be easily installed in an existing sewerage facility and can improve workability of sewerage maintenance. is there.

[0006]

An optical cable connection box of the present invention has a tubular portion into which a hollow structure buried near the surface of the earth is inserted, and a connection portion of an optical cable taken out from the inside of the hollow structure. And a connection box body for accommodating the extra length portion, and a lid portion provided so as to cover and close the connection box body.

When installing such an optical cable connection box, for example, first, the ground around the hollow structure (such as a sewage cell) is dug to make a space for placing the connection box body. Then, the optical cable is taken out from the inside of the hollow structure to connect the optical cable, and the connecting portion and the extra length portion of the optical cable are housed in the connection box body. Then, the connection box main body is housed in the surface space previously created so that the hollow structure enters the tubular portion of the connection box main body, and the connection box main body is covered and closed with the lid. Therefore, the optical cable connection box can be easily installed without significantly changing the structure of the existing sewerage facility. Moreover, since the optical cable connection box is installed outside the hollow structure, the optical cable connection box does not interfere with sewage maintenance. In addition, since the extra length of the optical cable is stored in the connection box body, it is not necessary to take the extra length of the optical cable inside the hollow structure, and the optical cable hardly interferes with sewage maintenance. As described above, the maintenance work of sewage can be easily performed. Furthermore, since the extra length portion of the optical cable is routed along the outer peripheral surface of the tubular portion, the optical cable housed in the connection box body is not excessively bent.

Preferably, the lid portion has a circular opening corresponding to the cylindrical portion. Accordingly, the lid portion that closes the connection box body and the lid portion that closes the hollow structure can be configured separately and independently. Therefore, when maintaining sewage,
Since it is not necessary to remove the lid of the connection box body and only the lid of the hollow structure needs to be removed, the maintenance work of the sewage can be further facilitated.

Further, preferably, a main body accommodating member for accommodating the main body of the connection box is further provided, which has an opening for penetrating the hollow structure. In this case, after digging the ground around the hollow structure, the main body storage member is housed in the ground space so that the hollow structure penetrates the opening of the main body storage member. Then, after the connection portion and the extra length portion of the optical cable are housed in the connection box body, the connection box body is housed in the body housing member so that the hollow structure enters the tubular portion of the connection box body. By thus forming the optical cable connection box with a double structure, the connection portion and the extra length portion of the optical cable can be sufficiently protected.

The installation method of the optical cable connection box of the present invention is as follows:
Around the hollow structure buried near the surface of the earth, the step of forming a continuous recess in the circumferential direction of the hollow structure, and taking out the optical cable from the inside of the hollow structure to connect the optical cable, The step of housing the extra length portion in the connection box body of the optical cable connection box described above, the step of housing the connection box body in the recess so that the hollow structure enters the tubular portion of the connection box body, and the lid portion. And a step of covering the connection box body.

As described above, by using the above-mentioned optical cable connection box, the optical cable connection box can be easily installed in the existing sewer facility. Further, since the optical cable connection box and the optical cable hardly interfere with sewage maintenance, sewage maintenance work can be easily performed. Furthermore, the extra length of the optical cable can be stored in the junction box body without forcibly bending the optical cable.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an optical cable connection box and an optical cable connection box installation method according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of an optical cable connection box according to the present invention. In the figure, an optical cable junction box 1 of the present embodiment accommodates a connecting / branching portion of an optical cable which is drawn into a house through an inside of a cylindrical sewer basin 2 buried near the surface of the earth together with an extra length portion. Is.

The diameter of the box 2 is, for example, about 150 mm, and the length (height) of the box 2 is, for example, about 500 mm. A sewage pipe 3 is connected to the basin 2, and an optical cable runs through the sewage pipe 3. A hole 4 for taking out the optical cable is provided on the upper portion of the square 2. A lid 5 is detachably provided on the upper end of the box 2.

The optical cable connection box 1 has a connection box body 6. This connection box body 6 is fixed to the bottom plate portion 7 and an inner peripheral edge portion of the bottom plate portion 7, and a cylindrical portion 8 into which the box 2 is inserted.
And an annular outer frame portion 9 fixed to the outer peripheral edge portion of the bottom plate portion 7. Then, as shown in FIG. 2, the connecting / branching portion and the extra length portion of the optical cable 11 are stored in a ring-shaped storage space 10 formed between the tubular portion 8 and the annular outer frame portion 9. Optical cable 1 in storage space 10
An accommodating tray 12 for accommodating one connecting / branching portion is arranged. When the optical cable 11 is connected / branched, the optical fibers exposed by removing the coating of the optical cable 11 are fusion-spliced, and the fusion-spliced portion is accommodated in the accommodation tray 12.

The cylindrical portion 8 is provided with a hole 13 for drawing the optical cable 11 taken out from the hole 4 of the box 2 into the storage space 10. Here, the extra length portion of the optical cable 11 introduced from the hole 13 is stored in the storage space 1
When it is housed in 0, the extra length portion is routed along the outer peripheral surface of the tubular portion 8. Therefore, the optical cable 11 is not subjected to an excessive bending force, and a desired cable bending radius is secured.

A ring-shaped lid 14 having a circular opening 14a corresponding to the tubular portion 8 is detachably provided on the upper end of the junction box body 6 as described above. The storage space 10 of the main body 6 is covered and closed.
As a result, even when the lid portion 14 is attached to the connection box body 6, the lid portion 5 of the box 2 can be detached and attached independently. A packing (not shown) for waterproofing is provided on the peripheral portion of the lid portion 14.

The connection box body 6 and the lid portion 14 described above are used.
Is made of FRP (fiber reinforced plastic), a metal having corrosion resistance (for example, stainless steel), or the like.

Further, the optical cable connection box 1 has a main body storage member 15 for storing the connection box main body 6. The main body storage member 15 is composed of a bottom plate portion 16 having a circular opening 16a for allowing the box 2 to penetrate therethrough, and an annular frame body portion 17 provided on the outer peripheral edge portion of the bottom plate portion 16.
The main body storage member 15 is made of concrete or the like.

At the upper end of such a main body storage member 15,
A ring-shaped lid 18 having a circular opening 18a is detachably provided. The diameter of the circular opening 18a is 2
It is slightly larger than the outer diameter of. This allows
Even when the lid portion 18 is attached to the main body storage member 15, the lid portion 5 of the measure 2 can be detached and attached independently. In addition, also in the peripheral portion of the lid portion 18,
A packing (not shown) for waterproofing is provided. The lid 18 is made of cast metal or the like.

Optical cable connection box 1 constructed as described above
Has a ring shape arranged around the box 2, so that the optical cable connection box does not interfere with the maintenance of sewage. Further, since the extra length portion of the optical cable 11 is stored in the connection box body 6 of the optical cable connection box 1, the optical cables 11 are not arranged in a bundle inside the box 2. Therefore, a large space for sewage maintenance can be provided in the basin 2, so that the maintenance work can be easily performed.

Further, since the lid portion 14 for covering the junction box body 6 and the lid portion 18 for covering the body accommodating member 15 are both ring-shaped, only the lid portion 5 of the box 2 is removed during maintenance of sewage and the maintenance of the optical cable is performed. , Lids 14, 1
Only 8 should be removed. As a result, the efficiency of each maintenance work can be improved. Further, since it is not necessary to remove the lids 14 and 18 at the time of sewage maintenance, it is possible to prevent accidental contact with the connection / branch portion of the optical cable 11.

Further, the optical cable connection box 1 is connected to the connection box body 6
Since it has a double structure including the main body accommodating member 15, the connection / branching portion and the extra length portion of the optical cable 11 are surely protected, and high reliability is obtained.

Next, a method of installing the optical cable connection box 1 having the above structure will be described with reference to FIG.

First, the soil around the box 2 buried near the surface of the earth is dug up to form an annular recess for receiving the optical cable connection box 1. And the box 2 is the main body storage member 15
Body housing member 1 so as to penetrate through the circular opening 16a of
5 is put in the annular recess (FIG. 3 (a)).

Next, the optical cable 11 passing through the box 2 is taken out from the hole 4 of the box 2 (FIG. 3 (b)). Then, the coating on the tip of the optical cable 11 is removed to expose the optical fibers, the optical fibers to be branched and connected are fused, and the fused portion is accommodated in the accommodation tray 12. Then, the storage tray 12 is stored in the storage space 10 of the connection box body 6 together with the extra length portion of the optical cable 11 (FIG. 3C).
Next, the lid 14 is attached to the junction box body 6 (see FIG.
(D)).

Next, the connection box main body 6 to which the lid 14 is attached is stored in the main body storage member 15 so that the box 2 penetrates the tubular portion 8 of the connection box main body 6 (FIG. 3 (e)). . Then, the lid 18 is attached to the main body storage member 15 (see FIG.
(F)).

By performing the installation work of the optical cable connection box 1 including the connection of the optical cable 11 in this way,
The optical cable connection box 1 can be easily installed in the existing box 2. Further, since the connection of the optical cable 11 and the like are all performed on the ground, the work becomes easy.

The present invention is not limited to the above embodiment. For example, in the optical cable connection box of the above embodiment, the outer frame portion of the connection box body has a ring shape,
The outer frame portion of the connection box body may have a rectangular shape or the like as long as it has a tubular portion into which the box 2 is inserted.

In the optical cable connection box of the above embodiment, the main body storage member 15 for storing the connection box main body 6 is prepared in advance. The equivalent may be made on-site. That is, after digging the soil around the box 2 to form the annular recess, concrete or the like may be provided on the bottom surface and the side surface of the annular recess.

Further, it is of course possible to directly store the connection box body in an annular recess formed by digging the soil around the box 2 without providing such a main body storage member or the like. In this case, the number of members constituting the optical cable connection box is reduced, so that the cost can be reduced.

Further, the optical cable connection box of the above-mentioned embodiment is installed near the surface of the earth so as to surround a cylindrical box, but the present invention is also applicable to a box having a rectangular cross section. . Further, the present invention is not limited to such a box, but can be applied to a sewage hollow structure such as a manhole.

[0033]

According to the present invention, in the connection box body having the tubular portion into which the hollow structure buried near the surface of the earth is inserted, the connecting portion and the extra portion of the optical cable taken out from the inside of the hollow structure are provided. Since the long part is stored, the optical cable connection box can be easily installed in the existing sewer facility. In addition, the workability of sewage maintenance is improved.
Furthermore, the extra length of the optical cable can be stored in the junction box body without forcibly bending the optical cable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an optical cable connection box according to the present invention.

2 is a cross-sectional view showing a state in which a connection portion and an extra length portion of an optical cable are housed inside a connection box body shown in FIG.

FIG. 3 is a diagram showing an embodiment of a method for installing an optical cable connection box according to the present invention.

[Explanation of symbols]

1 ... Optical cable connection box, 2 ... Sewage box (hollow structure),
6 ... Connection box body, 8 ... Cylindrical part, 11 ... Optical cable, 14
... Lid, 14a ... Circular opening, 15 ... Main body storage member, 1
6a ... Circular opening.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02G 9/10 H02G 9/10 11/00 11/00 W

Claims (4)

[Claims] 1. A connection box for accommodating a connection part and an extra length part of an optical cable taken out from the inside of the hollow structure having a tubular part into which a hollow structure buried near the surface of the earth is inserted. An optical cable connection box comprising a main body and a lid portion provided so as to cover and close the connection box main body. 2. The optical cable connection box according to claim 1, wherein the lid portion has a circular opening corresponding to the tubular portion. 3. The optical cable junction box according to claim 1, further comprising a main body accommodating member for accommodating the junction box main body, which has an opening for penetrating the hollow structure. 4. A step of forming a continuous recess in the circumferential direction of the hollow structure around the hollow structure buried near the surface of the earth, and taking out an optical cable from the inside of the hollow structure to connect the optical cable. And storing the connection portion and the extra length portion of the optical cable in the connection box body of the optical cable connection box according to claim 1, and so that the hollow structure enters the tubular portion of the connection box body. And a step of accommodating the connection box main body in the recess, and a step of covering the connection box main body with the lid portion.