JPH04200217A - Conduit for cable - Google Patents

Abstract

PURPOSE:To make possible to draw out an optical fiber cable, as required, by making notches at a plurality of points in the sheath in the longitudinal direction of a conduit. CONSTITUTION:A conduit 120 is laid such that a branch 12 thereof is notched 120a at a point where a drainage pipe 13 of a building 2 is coupled with the branch 12. A winder for rewinding a building wire 8 feeds out a wire 810 provided with a hook 811 at the end thereof and then a robot for pipe inside work is operated to pass the hooked wire 810 through the drainage pipe 13 thus hooking the hook 811 at the end of the hooked wire 810 on a messenger wire 80 passed through the conduit 120. The winder is then operated to rewind the hooked wire 810 thus pulling the messenger wire 80 and the building wire 8 connected therewith into the drainage pipe 13. When the messenger wire 80 is further rewound, the building wire 8 is taken out through a private sink onto the ground. Upon finish of predetermined work, the building wire 8 is led into a building through the drainage pipe 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cable installation pipe through which a cable is inserted.

[Prior art]

In recent years, information communication networks using optical fibers as transmission media have been constructed in various places. Most of them are
It is a dedicated line that connects each large-scale communication terminal in a small number of large-scale business offices, etc., and between a large-scale communication terminal and an information communication base equipped with a large computer. Telephone lines are used for communication between small-scale communication terminals and between small-scale communication terminals and information communication bases equipped with large computers. There are the following reasons why telephone lines are used for communication regarding each small-scale communication terminal. That is, since telephones have a high penetration rate, telephone lines are installed in most of the houses where the small-scale communication terminals are to be installed, and they are easy to use.

On the other hand, when trying to use other transmission media, the following problems arise. That is, for example, when installing an optical fiber cable, it is necessary to construct a utility pole exclusively for the installation, and when burying the optical fiber cable underground, it is necessary to construct an underground conduit. This is because the cost required for these constructions is high.

In order to reduce such construction costs, a method of installing optical fiber cables in an existing communication route network such as a sewerage piping network where communication routes to each house are established can be considered. Small businesses and households that use information and communications using optical fiber as a transmission medium are concentrated in urban areas, so it is important to install fiber optic cables using the sewage piping networks maintained in urban areas. Once installed, a route for optical fiber cables to each house can be secured.

A sewerage piping network consists of branch pipes, which are pipes that combine sewage from each house in a given area, and main pipes, which combine sewage from multiple branch pipes and flow to a sewage treatment plant. It is made up of.

When installing optical fiber cables in a sewerage piping network configured in this way, the optical fiber cables are extended from the trunk line of the optical fiber cable in the main pipe to the branch lines in each branch pipe. The house line, which is the lead-in line of the optical fiber cable to the house, uses manholes for work 9 inspection, which are installed in many branch pipes of the sewerage piping network, as branching and connection points for the optical fiber cable, and among these manholes, the optical A method has been considered in which the fiber optic cable is branched off from the branch line at the manhole closest to the house where the fiber cable is drawn, and then drawn into the house.When installing the fiber optic cable inside the sewer pipe in this way, the sewer pipe is connected to the sewer pipe. Since the maximum water flow is designed to occupy 80% of the capacity of the pipe, fiber optic cables must be placed in the upper 20% area of the sewer pipe.For this reason, the sewer pipe must be installed using the following method. Fiber optic cables were installed.

FIG. 9 is a cross-sectional view of a conventional sewage pipe showing a state in which optical fiber cables are laid within the sewage pipe.

Reference numeral 103 in the figure indicates an L-shaped metal fitting, and by driving this metal fitting 103 into the upper part of the inner wall of the sewage pipe 101 at predetermined distances in the axial direction, the optical fiber cable 102 with a circular cross section can be connected to the metal fitting 103 and the inner wall. It is fixed to the upper part of the inner wall in the sewage pipe 101 in such a manner that it is sandwiched between the upper part and the upper part.

When installing optical fiber cables using this method, branch lines and a large number of house lines must be installed within the branch pipe, but since the space in which optical fiber cables can be installed is limited, many cables must be installed within the branch pipe. There was a problem that it was not possible to install house lines. As a solution to this problem, an installation tube is considered in which a plurality of holes are formed in the tube through which optical fiber cables are inserted. A single pipe like this can accommodate a plurality of optical fiber cables, so when it is fixed to the upper part of the inner wall of the branch pipe with the metal fitting 103, it will branch into 20% of the upper part of the sewage pipe. Lines and multiple house lines can be laid.

[Problem to be solved by the invention]

However, when installing additional house lines in response to fluctuations in network demand such as changes in the lead-in destination of the house line or an increase in the number of lead-in destinations, the above-mentioned installation pipe is not fixed within the branch pipe. If this happens, it is difficult to newly draw out the house wire from the installed pipe within the branch pipe, so there is a problem in that it is not possible to draw in the house wire in response to the addition of house wires.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a cable installation pipe that allows an optical fiber cable to be pulled out as required.

[Failure to solve the problem]

A cable installation pipe according to the first invention of the present application includes a tubular jacket and a partition wall that partitions the inside of the jacket into a plurality of holes, and the cable installation pipe is configured to allow the cable to be inserted through the holes. A plurality of notches are formed in the longitudinal direction of the outer cover.

A cable installation pipe according to a second invention of the present application includes a tubular jacket and a partition wall that partitions the inside of the jacket into a plurality of holes, and the cable installation pipe is configured to allow the cable to be inserted into the holes. The cable installation pipe according to the first invention of the present application is characterized in that a plurality of cuttable parts are formed in the longitudinal direction so that the outer sheath can be cut away. A plurality of cables are inserted through a plurality of holes formed inside, and a plurality of cutouts are formed in the outer jacket in the longitudinal direction, so that the desired cutout can be inserted as needed. The cable can be pulled out from the

The cable installation pipe according to the second invention of the present application is such that a plurality of cables are inserted through a plurality of holes formed inside the cable installation pipe, and the cuttable portion has a structure in which the outer sheath can be cut out. Since a plurality of holes are formed in the longitudinal direction, a desired cuttable portion can be cut out as necessary, and the cable can be pulled out from the cutout portion.

〔Example〕

The present invention will be specifically described below based on drawings showing embodiments thereof. FIG. 1 is a schematic block diagram showing the overall configuration of an optical communication path to which a cable pipe according to the present invention is applied.

In the figure, 12.12... are branch pipes of the sewerage piping network, and the branch pipes 12.12... are connected to the drainage pipes 13, 13... from the houses 2, 2... The branch pipes 12, 12, . . . are provided with a large number of manholes 3 for inspection 2. In addition,
Here, → hole 3 refers to a hole for inspection of work 2, which includes not only a hole through which an operator can enter, but also a small hole through which an operator cannot enter. Branch pipe 12,
12... are respectively connected to the main pipes 11, 11... of the sewerage piping network that extend over long distances, and the sewage flowing through the branch pipes 12, 12... is treated as sewage. The water flows into main pipes 11, 11, etc., which lead directly to field 1, respectively. The sewage flowing into the main pipes 11, 11... is collected in a sewage treatment plant 1 and subjected to sewage treatment. This sewage treatment plant 1 is equipped with a large computer and equipment for providing and managing optical communication information.

In this way, in the sewage pipe network, the routes from the sewage treatment plant 1 to the houses 2, 2, . . . and the routes between the houses 2, 2, . . . are connected by sewage pipes. Optical fiber cables, which are the transmission medium of the optical information communication device, are installed inside the main pipes 11, 11, . . . and branch pipes 12, 12, . . . of the sewerage piping network. For each house 2, 2..., the house 2
, 2 . . . The optical fiber cables branched within the manholes 3, 3 . . . closest to the manholes 3, 3 .

FIG. 2 is a schematic perspective view showing the installation state of the optical communication path. In FIG. 2, reference numeral 91 is a private tank which is a drainage basin provided in the house 2, and the private tank 91 has the drain pipe 13.
The ends of are connected. Further, a public basin 92 serving as a drainage basin is provided in the middle of the drain pipe 13. Drainage water from the house 2 flows through a drain pipe 13 from a private tank 91 through a public tank 92, and then flows into a branch pipe 12. The optical fiber cable is installed from the sewage treatment plant 1 into the main pipe 11, and the optical fiber cable in the trunk line 6 is installed in the main pipe 11 through main manholes for maintenance 2 inspection (not shown). 1), and the branched optical fiber cable is installed as a branch line 7 in a branch pipe 12.

When pulling optical fiber cables into each house 2.2..., branch wires 7 are attached to the lower part of the manhole 3 cover, branch wires 7 are branched in the junction box 4, and the branched optical fiber cables are connected to the house wires. 8 as branch pipe 12° drain pipe 13. Public square 9
2 and a private cell 91 to extend to the house 2. House 2.
The optical fiber cables drawn into 2... are connected to an optical modem (not shown) that converts optical communication signals (or electrical signals) into electrical signals (or optical communication signals). The optical modem is connected to an optical communication terminal, and the signal converted by the optical modem is given to the terminal. Further, the electrical signal given from the terminal to the optical modem is converted into an optical communication signal, branched via the house line 8, and given to the junction box 4.

By using the optical fiber cables installed in this way, optical communication between the sewage treatment plant 1 and each house 2, 2... is possible, as well as optical communication between each house 2, 2... It becomes possible.

In the branch pipe 12, the house wire 8 is connected to the installation pipe 1, which will be described later.
It is housed in 20. FIG. 3 is a longitudinal sectional view of a cable installation pipe according to the first invention of the present application, and FIG. 4 is a schematic perspective view thereof.

As shown in FIG. 3, the installation pipe 120 is provided with an axial tube portion 121, which is a small diameter tube, at its axial center portion, and on its outer periphery,
Four plate-shaped partition walls 122, 122... having a predetermined width are equally distributed, and the outer sides of the partition walls 122, 122... are surrounded by an outer covering part 123 with a circular cross section, and the inside thereof is It is a long tube in which the space is partitioned into four holes by partition wall sections 122, 122, . . . , and the axial tube section 121. The partition wall parts 122, 122... and the outer cover part 123 are integrally formed of resin, and a plurality of galvanized steel wire rods 124, 124... are pushed through the inside of the shaft core tube part 121. This increases its strength. This installation pipe 120 is the fourth
As shown in the figure, notches 120a, 120a... (only two locations are shown) are formed by cutting out the entire circumference of the outer cover part 123 by a predetermined length in the longitudinal direction at every predetermined distance in the longitudinal direction. However, the outer covering portion 123 is made discontinuous.

When installing the installation pipe 120 configured in this way inside the branch pipe 12, the L-shaped fittings 103, 103... are installed in the branch pipe 1.
By driving the installation pipe 120 into the upper part of the inner wall of the metal fitting 103 at predetermined distances in the axial direction of the metal fitting 103.
03... and the inner wall, and is fixed to the upper wall of the branch pipe 12. When fixing the installation pipe 120, the messenger wire 80, which is the house line 8 or a call line connected to one end of the house line 8, is inserted in advance into the installation pipe 120 (.

Fig. 5 is a schematic cross-sectional view of the branch pipe 12 and the drain pipe 13 showing the outline of the construction method for drawing the house wire 8 in the installation pipe 120 to the house 2, and Fig. 6 is a schematic cross-sectional view of the branch pipe 12 and the drain pipe 13 showing the detailed construction method. 13 is a schematic cross-sectional view of FIG.

In this case, as shown in FIG. 5, the installation pipe 120 is installed in the branch pipe 12 so that its notch 120a is located at the part where the drain pipe 13 of the house 2 is connected to the branch pipe 12. Further, a winding machine 81 for winding the house wire 8 is installed near the private cell 91 of the house 2 into which the house wire 8 is drawn. and,
From this winding machine 81, as shown in FIG. The wire with a hook 810 is inserted into the drain pipe 13 that reaches the branch pipe 12 via the square 92, and the hook 811 at the tip of the wire with a hook 810 is inserted into the installation pipe 120 by the operation of the robot. When hooked to the hook hook 811 or the hook wire 80, the winder 80
is operated to wind up the hooked wire 810, pull the messenger wire 80 and the house wire 8 connected thereto into the drain pipe 13, and then wind the hooked wire 810.
By winding up the wire 0, the house wire 8 is taken out to the ground through the private cell 91. After performing the prescribed work on the house wire 8 taken out above ground, the house wire 8 is connected to the drain pipe 1.
3 and into house 2.

FIG. 7 is a schematic perspective view of the installation pipe of the second invention of the present application, and FIG.
The figure is an axial sectional view of the same, and in FIGS. 7 and 8,
Components that are the same as those in FIGS. 3 and 4 are given the same numbers, and their explanations will be omitted.

In the installation pipe of the second invention of the present application, the outer covering part 123 is continuously formed, and at every predetermined distance in the longitudinal direction, the entire circumference of the outer covering part 123 is circumferentially moved by a predetermined length in the longitudinal direction. Two circumferential grooves 123 that can be cut into four parts
0a, 1230a and four longitudinal grooves 1230b,
Cuttable portion 120b formed by engraving 1230b...
.

120b... (only one location is shown) is provided. That is, the circumferential grooves 1230a, 1230a and the longitudinal grooves 1230b, 1230b, .・・・
- can be cut out into four parts as shown by the notch 120a indicated by B in the figure. Also,
Cuttable portion 120b.

120b... is provided with an identification number 1231 on the outer peripheral surface of each divided portion to be divided into four parts for identifying the divided portion.
゜1231... is marked.

When drawing the house wire 8 from inside the installation pipe 120 of the second invention of the present application, first, the notchable part 1 is inserted inside the branch pipe 12.
20b is installed so that it is located at the part where the drain pipe 13 of the house 2 connects to the branch pipe 12. In addition, a robot for working inside the pipe equipped with an imaging device such as a COD camera and a fiber scope is placed in the branch pipe 12 and the drain pipe 13. Then, the outer covering part 12 necessary for drawing in the house wire 8 is captured by the imaging device of the robot for working inside the pipe.
Identification number 1231.1231 of the cuttable part 120b of No. 3
Recognizes ... and has the pipe work robot cut out the necessary parts.

After cutting out the cuttable portion 120b in this way,
The house wire 8 is drawn to the house 2 by the construction method shown in FIGS. 5 and 6 as described above.

As described above, in the present invention, if the messenger wire 80 is inserted into the installation pipe 120 in advance, the house wire 8 can be drawn into the house 2 from within the installation pipe 120 as necessary.

In addition, in this embodiment, the method of drawing the house line 8 from the private cell 91 has been explained, but the method is not limited to this, and the method is not limited to this.
The house line 8 may also be drawn in from.

Further, in this embodiment, the inside of the installed pipe is divided into four parts, but the pipe is not limited to this, and a pipe with other divisions other than four parts may be used.

Furthermore, in this embodiment, the partition wall portion 122°12
2... used a pipe that is continuous in the longitudinal direction of the installed pipe, but the notch part 120a, 120a... (
Alternatively, discontinuous partition wall portions 122, 122, etc. may be used in which the partition wall portions 122, 122, etc. are not provided in the cuttable portions 120b, 120b, .

〔effect〕

The present invention is as described above, and in the cable installation pipe according to the first invention of the present application, a plurality of notches are formed in the longitudinal direction of the outer sheath, so that each cutout can be cut out as necessary. The cable can be pulled out from the notch, and in the cable installation pipe according to the second invention of the present application, a plurality of cuttable parts are formed in the longitudinal direction so that the outer sheath can be cut away. If necessary, the outer jacket can be cut out and the cable can be pulled out from the cutout. The present invention has excellent effects, such as being able to pull out the cable inserted through the installation pipe as needed.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram showing the overall configuration of an optical communication path to which a cable installation pipe according to the present invention is applied, Fig. 2 is a schematic perspective view showing the installation state of the optical communication path, and Fig. 3 1 is an axial sectional view of a cable installation pipe according to the first invention of the present application, FIG. 4 is a schematic perspective view thereof, and FIG. 5 is a branch pipe and drainage schematically showing a construction method for drawing house wires in the installation pipe to a house. 6 is a schematic cross-sectional view of a branch pipe and a drain pipe showing detailed construction methods thereof; FIG. 7 is a schematic perspective view of a cable installation pipe according to the second invention of the present application; FIG. Figure 8 is its axial sectional view, and Figure 9 is its axial sectional view.
The figure is a sectional view of a branch pipe showing how optical fiber cables are laid in a conventional sewage pipe. 8...House wire 80...Metsusenja wire 12
0... Installation pipe 122... Partition wall part 123.
...Outer covering part 120a...Notch part 120b...
・Cuttable part patent Applicant: Tokyo Sewerage Service Co., Ltd. and two other agents Patent attorney Noboru Kono
4 Figure 1230 b Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. A cable installation pipe comprising a tubular jacket and a partition wall that partitions the inside of the jacket into a plurality of holes, the cable being inserted through the holes, comprising: A cable installation pipe characterized by having a plurality of notched portions formed in the longitudinal direction thereof. 2. A cable installation pipe comprising a tubular jacket and a partition wall that partitions the inside of the jacket into a plurality of holes, the cable being inserted through the holes, the jacket having a structure in which the jacket can be cut out. A cable installation pipe characterized in that a plurality of cuttable parts are formed in the longitudinal direction of the cable pipe.