JP3795595B2 - Optical cable installation method for existing pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for inserting and holding an optical cable in an existing pipe to be corrected.
[0002]
[Prior art]
In recent years, optical communication systems are becoming popular as communication networks for providing services to local residents in public fields such as medical care, health care, and welfare due to the construction of multimedia.
[0003]
When installing this communication network, optical cables that are bundled and stored in a large number of optical fibers used in optical communication systems are required to be routed to each terminal, which is an environmental point of view. It is designed to be buried underground from the ground.
[0004]
Therefore, recently, a method of using a water pipe network as an existing pipe that has already been buried and has a high penetration rate (95%) and extends to every corner of each home or office has been adopted.
[0005]
[Problems to be solved by the invention]
By using the existing water pipe in this way, the underground excavation work on the public road is not required for burying the optical cable, so that the efficiency of the optical cable laying work is improved and the excavation work cost can be reduced.
[0006]
However, the following points are problems when using existing water pipes.
[0007]
In other words, in order to insert and take out an optical cable in an existing water pipe in an undisturbed state, excavate the ground that becomes the entrance and exit of the optical cable, drill the existing water pipe, and insert and take out the optical cable using a dedicated device. There is a need.
[0008]
In addition, the optical cable inserted in the existing water pipe is not supported in the existing water pipe and is in a free state, so the water flow in the water pipe changes in the forward and reverse directions, and the water pressure changes, causing an internal rampage In other words, there is a risk of being damaged by the contact portion.
[0009]
On the other hand, since the water pipe is corroded if it is used for a long period of time, when the portion is confirmed by periodic inspection, the renovation work is performed in a predetermined section.
[0010]
This correction work will be described in detail later, but the inner pipe is inserted into the existing water pipe that has been corroded and expanded while being affixed, and the existing pipe is corrected by attaching it to the inner wall, and the inner pipe is inserted, This is a work to correct an existing pipe by filling mortar between the existing pipe and the inner pipe. Examples of this method include a hose lining method, an in-situ form method, a pipe reverse method, and a pipe-in-pipe method.
[0011]
Therefore, the inventor has found that inserting and supporting the optical cable inserted into the existing pipe between the existing water pipe and the inner pipe attached to the inner wall is the best means for solving the above problem. .
[0012]
The present invention has been made to solve the above-described problems, and provides a method for laying an optical cable inside a water pipe without being affected by the water flow when renovating an existing water pipe in a predetermined section. The purpose is to do.
[0013]
[Means for Solving the Problems]
In the process of laying an inner pipe on an existing water pipe to be repaired in a predetermined section and correcting the existing water pipe,
After the optical cable is inserted into the existing water pipe from one work mine and taken out from the other work mine, the hard vinyl chloride band plate is attached to the other work by a pipe making machine in the existing water pipe of one work mine. Next, the strip plate inserted into the existing water pipe is continuously wound by the pipe making machine from the tip of the other work mine side to the one work mine, and the seal portions are mutually connected. The inner pipe is pasted over the entire length of the existing water pipe while expanding the diameter while being coupled and sealed, and the optical cable is sandwiched and held between the existing water pipe and the inner pipe pasted by the diameter expansion. It is a feature.
[0014]
Due to this feature, a rigid vinyl chloride strip inserted into an existing water pipe by a pipe making machine is continuously wound by the pipe making machine from the tip of the other working mine side to the one working mine and sealed. parts are coupled to each other, sealed pasted over the inner tube in an existing water pipe total length while expanded while Runode, with an optical cable can be installed in a desired position of the existing water pipe wall, the water flow water pipe Even if the state changes forward or reverse or the water pressure changes, the optical cable inserted into the existing water pipe is securely held without being disturbed in the pipe, and the life of the optical cable is extended and can be used semipermanently.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the drawings with embodiments. One embodiment of the present invention will be described.
[0016]
FIG. 1 is an explanatory view of a method for attaching an inner pipe to an inner side of an existing water pipe as an embodiment of the present invention, and FIG. 2 is a diagram illustrating a process of attaching an optical pipe to the existing water pipe in an adjustment process for attaching the inner pipe to the existing water pipe. It is explanatory drawing of the process laid between an inner pipe. The correction work for the existing water pipe 1 is performed between two working pits in a predetermined section including the existing water pipe to be corrected.
[0017]
The correction process of the existing water pipe 1 shown in FIG. 1 and FIG. 2 is performed by a system called an expander system. FIG. 3 is a cross-sectional view showing an optical cable sandwiched between an existing water pipe and an inner pipe.
[0018]
In this expander method, a strip 2 made of hard vinyl chloride is sent from the ground to a pipe making machine 6 installed at the bottom of one working pit 5, and the pipe making machine 6 forms the strip 2 as shown in FIG. The inner pipe PA is manufactured in the existing water pipe 1 while being continuously wound and the seal portions 4 are engaged with each other and sealed.
[0019]
First, before the inner pipe PA is inserted into the existing water pipe 1, the existing water pipe 1 between the work pits 5 and 7 is cleaned in advance. Next, the optical cable 3 is inserted from one work pit 5 and inserted into the existing water pipe 1 to be corrected, and is taken out from the other work mine 7 to the ground. In this state, the tip of the inner pipe P piped in a small diameter by the pipe making machine 6 in the existing water pipe 1 of one working mine 5 is sent to the other working mine 7.
[0020]
Next, the diameter of the small inner pipe PA inserted into the existing water pipe 1 is sequentially increased from the tip of the other working mine 7 side toward the one working mine 5 by a diameter expansion control system (not shown). Going, it is pasted over the entire length of the existing water pipe 1 between the working mine 5,7. Therefore, the optical cable 3 inserted into the existing water pipe 1 is sandwiched and held between the existing water pipe 1 and the inner pipe PA attached by expanding the diameter.
[0021]
In this way, the optical cable 3 is inserted between the existing water pipe 1 and the inner pipe PA when the inner pipe PA is lined in the existing water pipe 1, and is thus inserted and held in the existing water pipe 1. Since the optical cable 3 inserted in the water pipe 1 is stably held without being disturbed in the pipe 1 even if the water flow in the water pipe 1 changes in the forward or reverse direction or the water pressure changes, the life of the optical cable Extension is possible.
[0028]
【The invention's effect】
The present invention has the following effects.
[0029]
According to the present invention, the narrow inner pipe inserted into the existing water pipe is pasted over the entire length of the existing water pipe by sequentially increasing the diameter from the tip of the other working mine toward the one working mine, Since the optical cable is held in a state of being sandwiched between the existing water pipe and the inner pipe attached by expanding the diameter, the optical cable can be installed at a desired position on the inner wall of the existing water pipe, Even if the water flow state changes in the forward and reverse directions or the water pressure changes, the optical cable inserted into the existing water pipe is securely held without being disturbed in the pipe, and the life of the optical cable is extended and can be used semipermanently.
[0031]
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a method for attaching an inner pipe to an inner side of an existing water pipe as one embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a process of laying an optical cable between the existing water pipe and the inner pipe in a correction process for attaching the inner pipe in the existing water pipe, showing an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing an optical cable sandwiched between an existing water pipe and an inner pipe .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing water pipe 2 Band plate 3 Optical cable 4 Sealing part 5 One work mine 6 Pipe making machine 7 The other work mine 8 Robot 9 UV lamp 10 TV camera
PA inner pipe

Claims (1)

In the process of lining the inner pipe to the existing water pipe to be repaired in a predetermined section and correcting the existing water pipe,
After the optical cable is inserted into the existing water pipe from one work mine and taken out from the other work mine, the hard vinyl chloride band plate is attached to the other work by a pipe making machine in the existing water pipe of one work mine. Next, the strip plate inserted into the existing water pipe is continuously wound by the pipe making machine from the tip of the other work mine side to the one work mine, and the seal portions are mutually connected. The inner pipe is pasted over the entire length of the existing water pipe while expanding the diameter while being coupled and sealed, and the optical cable is sandwiched and held between the existing water pipe and the inner pipe pasted by the diameter expansion. A method for laying an existing optical cable inside a pipe.

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