JP2000309976A - Piping structure and wiring method of optical fiber cable by the piping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping structure for efficiently wiring optical fiber cables from a sewage main pipe to each house easily and the wiring method of the optical fiber cables by the piping structure. SOLUTION: A sewage main pipe 21 is piped so as to connect a section between manholes 1 buried into a ground, and a wiring pipe 3 for the optical fiber cables 5 is installed into the sewage main pipe 21 while sleeves 4 extended to each house 6 apart from the sewage main pipe 21 are connected to the manholes 1. In the piping structure, the optical fiber cables 5 wired in the wiring pipe 3 in the sewage main pipe 21 are branched in the manholes 1, and wired to each house 6 through the sleeves 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping structure for wiring an optical fiber cable using a sewer pipe, and a wiring method therefor.

[0002]

2. Description of the Related Art Generally, in a telecommunications company,
In order to wire optical fiber cables and the like, dedicated pipes for housing these optical fiber cables are laid. In recent years, not only between these companies,
In order to expand the information network to the level of each household, it is considered to use the inside of a sewer pipe, which has spread to ordinary households, as a wiring path for optical fiber cables.

Conventionally, as a sewer pipe to which such an optical fiber cable can be wired, for example, Japanese Patent Laid-Open No.
As shown in JP 77677, there is proposed a structure in which a cable housing portion separated from a lower portion of a sewage flow is formed in a sewage pipe main body along a pipe axis direction.

[0004]

However, the sewage pipeline is
A plurality of sewage branch pipes branching from the sewage main pipe are divided into respective homes, and the pipe diameter becomes smaller as going from the sewage main pipe to the sewage branch pipe toward the upstream of the flow. Therefore, the optical fiber cable passing through the cable storage section of the sewage main pipe must be branched for each sewage branch pipe. The inconvenience that the branching operation becomes difficult is caused. For example, Φ15
In the case where the sewage branch pipe 0 is connected, there is only a drilling space of about φ170 at the branch part, and the branching operation of the optical fiber cable cannot be practically performed.

[0005] Even if it is necessary to carry out sewage works after construction, since an optical fiber cable passes through the sewage pipe, not only sewage works companies but also electric work companies are required. .

The present invention has been made in view of the above circumstances, and has a piping structure for efficiently and easily wiring an optical fiber cable from a sewer main to each home, and an optical fiber cable having this piping structure. And a wiring method.

[0007]

According to the present invention, there is provided a piping structure in which a sewage main pipe is connected so as to connect between manholes buried underground, and an optical fiber cable is provided in the sewage main pipe. And the manhole is connected to a sheath pipe extending to each home separately from the sewage main pipe.

Further, according to the present invention, there is provided a method for wiring an optical fiber cable, wherein the optical fiber cable wired to a wiring section in a sewage main pipe branches in a manhole in the pipe structure, and is branched through a sheath pipe. Wiring to each home.

Further, in the method of wiring an optical fiber cable according to the present invention for solving the above-mentioned problems, a flexible tube is inserted into a sheath tube from each household and led out to a manhole. The optical fiber cable is inserted into a flexible tube, and the optical fiber cable is branched and connected to each home.

Further, according to the present invention, there is provided a method for wiring an optical fiber cable, comprising: storing an optical fiber cable in a sheath tube in advance; and providing an optical fiber cable in the sheath tube and an optical fiber cable routed in a sewer tube. Is connected at the position of the manhole, the optical fiber cable in the sheath tube is taken out from the hole drilled in the sheath tube, and inserted into a new sheath tube branched and connected to this hole, so that the tip of this new sheath tube is obtained. The optical fiber cable is branched into a home provided in the home.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the entire structure of a piping structure according to the present invention, and FIGS. 2 and 3 show the essential parts of the same.

That is, in this piping structure, a wiring pipe 3 is provided in a sewage main pipe 21 connecting between manholes 1 buried underground, a sheath pipe 4 is connected to the manhole 1, and a sewage main pipe is connected. The optical fiber cable 5 wired to the wiring pipe 3 in 21 is branched in the manhole 1 and wired to each home 6 via the sheath pipe 4.

The manhole 1 is provided with a sewage main 21 to be used.
Sewage main pipe 2 with a pipe diameter of Φ200
In the case of 1, it is installed at a maximum interval of about 50 m. A branch box 11 is provided in the manhole 1. At the position of the branch box 11, the optical fiber cable 5 wired to the wiring pipe 3 in the sewer main pipe 21 is relayed.

The sewage pipe 2 includes a sewage main pipe 21 and a sewage branch pipe 2.
And 2. The sewage main pipe 21 connects between the manholes 1. Sewage branch pipe 22
Are extended from the public space 60 of each home 6 and connected to the sewage main 21. This drain 2
When the pipe diameter of the sewage main pipe 21 is Φ200, about Φ150
A degree of sewage branch 22 is used.

The manhole 1 and the sewage pipe 2 are not particularly limited in the material and type of the pipe, and various pipes such as a vinyl chloride resin pipe, a fume pipe, and an FRPM pipe can be used.

The wiring pipe 3 is fixed to an upper part in the sewage main pipe 21. In the wiring tube 3, a plurality of optical fiber cables 5 can be wired.

The sheath tube 4 comprises a sheath main tube 41 and a sheath branch tube 42. The sheath main pipe 41 is provided along the sewage main pipe 21. In this sheath main pipe 41, the number of optical fiber cables 5 of each home 6 existing between the manholes 1 is wired. The sheath branch pipe 42 is extended from each home 6,
It is configured to be connected to the sheath main pipe 41. This sheath tube 4
About Φ50 is used.

The sheath main pipe 41 may be provided along both sides of the sewage main pipe 21 as shown in FIG. 1, or one side of the sewage main pipe 21 as shown in FIG. May be provided along. The sheath main pipe 41 may be provided so as to communicate between the manholes 1 as shown in FIG. 1. However, since it is not necessary to consider the flow gradient of the sewage unlike the sewage pipe 2, FIG. As shown in (b), a dead end may be provided only for one manhole 1 and not for the other manhole 1. further,
The sheath main pipe 41 extends along both sides of the sewage main pipe 21, but does not necessarily have to be along the sewage main pipe 21. In addition, the sheath main pipe 41 may be formed not along both sides of the sewage main pipe 21 but vertically. In this case, when the sewage main pipe 21 is buried, the sewage main pipe 21 can be buried in a lump and the work efficiency can be improved. Main 4
There is a concern that this would hurt No. 1. Therefore, when the sheath main pipe 41 is buried along the top and bottom of the sewage main pipe 21, the sheath main pipe 41 is placed above or below the sewage main pipe 21.
It is preferable that the sheath main pipe 41 is buried together with a sheet material (not shown) of a mark or the like in order to notify that there is the presence.

Next, a method of wiring the optical fiber cable 5 will be described. First, along the sewage main pipe 21 connected between the manholes 1, the sheath main pipes 41 are connected to both sides of the sewage main pipe 21, respectively. In the sheath main tube 41,
A sheath branch pipe 42 is provided along each sewage branch pipe 22 branched from the sewage main pipe 21. Each of the sheath branch pipes 42 is connected to the sheath main pipe 41 from the position of the public trout 60 of each household 6, similarly to the sewage branch pipe 22.

Next, the sheath branch pipe 42 on each public mass 60 side is used.
From the end into the sheath branch pipe 42, for example, an inner diameter of about 8 m.
Then, a flexible tube 50 made of polyethylene or vinyl chloride is inserted. As a result, each flexible tube 50 is passed seamlessly from the sheath branch pipe 42 through the sheath main pipe 41 to the position of the manhole 1. At this time, the connecting joint 43 between the sheath branch pipe 42 and the sheath main pipe 41 is connected as shown in FIG. 5 so that the flexible tube 50 can be smoothly inserted from the public mass 60 side to the position of the manhole 1. , Flexible tube 5 toward manhole direction A
One having a direction leading to 0 is used.

Then, an optical fiber core wire 51 is passed from the manhole 1 side into each of the flexible tubes 50 led out to the manhole 1. This wiring is carried out by using a known means such as air pressure feeding.

Thus, the sewage main pipe 21 and the sewage branch pipe 2
Regardless of 2, the optical fiber cable 5 can be connected to each home 6 using the sheath main pipe 41 and the sheath branch pipe 42. In addition, since the sheath main pipe 41 and the sheath branch pipe 42 are separate pipes from the sewage main pipe 21 and the sewage branch pipe 22, the flow gradient does not need to be taken. Further, since the optical fiber cable 5 is branched from the manhole 1 and connected to each home 6, the branching work can be easily performed by using the inside of the manhole 1 as a working space.

In this embodiment, after the sheath main pipe 41 and the sheath branch pipe 42 are constructed, the optical fiber cable 5 is passed through the sheath main pipe 41 and the sheath branch pipe 42. However, as shown in FIG. 6A, an extra optical fiber cable 5
You may pass through. In this case, as shown in FIG. 6B, an extra optical fiber cable 5 in the sheath main pipe 41 is taken out from the hole 40 drilled to connect the new sheath branch pipe 42 to the sheath main pipe 41. It can be inserted into the sheath branch pipe 42 and wired to the position of the public mass 60.

However, it is necessary to make it possible to recognize which optical fiber cable 5 in the sheath main tube 41 is an extra one by using color coding, numbering or the like for the extra optical fiber cable 5. In this case, instead of passing through the extra optical fiber cable 5, only the flexible tube 50 may be passed through.

In the present embodiment, the sewage branch pipe 22
Is connected to a sewage main pipe 21. As shown in FIG. 7, a sewage branch pipe 22 is connected to a sewage horizontal drawing pipe 23 provided along the sewage main pipe 21, and the sewage horizontal drawing is performed. The sheath main pipe 41 and the sheath branch pipe 42 may be provided inside the pipe 23 and the sewage branch pipe 22.

However, in this case, inside the branch joint 24 of the sewage horizontal drawing pipe 23 and the sewage branch pipe 22, the sheath main pipe 4
Since it is necessary to perform a branching operation between the shell branch pipe 1 and the sheath branch pipe 42,
For example, it is preferable to use a branch joint 24 (for example, a product name, Kani Hall V300HG, manufactured by Sekisui Chemical Co., Ltd.) which is made to secure a branch space by the vertical pipe portion 24a.

[0028]

As described above, according to the present invention, according to the present invention, a sewage main pipe is connected so as to connect between manholes buried underground, and a wiring section for an optical fiber cable is provided in the sewage main pipe. The manhole is connected to a sheath pipe that extends to each home separately from the sewer main pipe, so the optical fiber cable that is routed to the wiring section in the sewer main pipe is branched in the manhole and the sheath pipe is connected. Through to each home. In addition, since the sheath tube can be laid without having to consider the flow gradient of the sewage, the sheath tube can be easily constructed.

According to the second aspect of the present invention, since the branching operation of the optical fiber cable can be performed in the manhole, the efficiency of the construction operation can be improved.

Further, according to the present invention described in claim 3,
A flexible tube is inserted into the sheath tube from each household and led out to the manhole, and from this manhole side, the core of the optical fiber cable is inserted into the flexible tube and the optical fiber cable is branched and wired to each household. Therefore, the joint of the optical fiber cable can be eliminated from each home to the manhole, and the highly reliable optical fiber cable can be wired.

Further, according to the present invention described in claim 4,
In the sheath tube, store the optical fiber cable in advance,
The optical fiber cable in the sheath pipe and the optical fiber cable wired in the sewer pipe are connected at the position of the manhole, the optical fiber cable in the sheath pipe is taken out from the hole drilled in the sheath pipe, and branched and connected to this hole. By inserting it into a new sheath tube, the optical fiber cable can be branched and wired to the home provided at the end of the new sheath tube. Can be easily performed.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an overall configuration of a piping structure according to the present invention.

FIG. 2 is a partially omitted enlarged view showing a main part of a piping structure according to the present invention.

FIG. 3 is a sectional view taken along line II in FIG. 2;

4 (a) and 4 (b) are schematic plan views showing other piping states of the sheath tube in the piping structure of the present invention.

FIG. 5 is a side view showing an example of a connection joint between a sheath main pipe and a sheath branch pipe in the piping structure of the present invention.

FIGS. 6A and 6B are process diagrams illustrating a method for wiring an optical fiber cable in the piping structure of the present invention.

FIG. 7 is a partially enlarged view showing another embodiment of the piping structure according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Sewage pipe 21 Sewage main pipe 22 Sewage branch pipe 3 Wiring pipe (wiring part) 4 Sheath pipe 40 hole 41 Sheath main pipe 42 Sheath branch pipe 5 Optical fiber cable 50 Flexible tube 51 Optical fiber core wire 6 Home

Claims (4)

[Claims] A sewage main pipe is connected so as to connect between manholes buried in the ground, a wiring section of an optical fiber cable is provided in the sewage main pipe, and a manhole is provided separately from the sewage main pipe. A piping structure characterized by connecting a sheath tube extending to each home. 2. The optical fiber cable according to claim 1, wherein the optical fiber cable wired to the wiring section in the sewage main pipe is branched in a manhole and wired to each home via a sheath pipe. Wiring method. 3. A flexible tube is inserted into a sheath tube from each household side and led out to a manhole. From the manhole side, a core wire of an optical fiber cable is inserted into the flexible tube to connect to each household. 3. The method for wiring an optical fiber cable according to claim 2, wherein the optical fiber cable is branched. 4. An optical fiber cable is housed in a sheath tube in advance, and the optical fiber cable in the sheath tube is
Connect the optical fiber cable that is routed inside the sewer pipe at the manhole position, take out the optical fiber cable inside the sheath pipe from the hole drilled in the sheath pipe, and insert it into a new sheath pipe that branches and connects to this hole The optical fiber cable wiring method according to claim 2, wherein the optical fiber cable is branched and wired to a home provided at the end of the new sheath tube.