JP2001027363A - Method for laying pipe along prescribed route - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method for laying a rigid protecting pipe along a route laying an optical communication cable in a sewage work pipe. SOLUTION: A double pipe 15 is formed by inserting an interior pipe 12 formed with a flexible air-tight coating layer 14 in an inner surface of a cylindrical cloth 13 in an inner side of a sheath pipe 9 formed with a flexible air-tight coating layer 11 in an outer surface of a cylindrical cloth 10, reaction hardening resin liquid is injected between the sheath pipe 9 and the interior pipe 12 in this double pipe 15, after it is arranged along a prescribed route, a pressure fluid is fed to flow in the interior pipe 12 to spread the double pipe 15 into a circular section, and the reaction hardening resin liquid is hardened. In this way, a pipe can be easily laid along a route curved in a complicated state. In the case of laying this pipe, the flexible double pipe 15 can be arranged along a free route, the pipe after laid is a rigid pipe mainly composed of reaction hardening resin, and the laid route can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laying a pipe along a predetermined path, and more particularly to a method of laying a thin pipe along a curved path such as a pipe buried underground. To a method for doing so.

[0002]

2. Description of the Related Art Conventionally, in a sewerage business, in order to appropriately manage information from facilities such as a treatment plant and a pumping station in the event of a disaster, and to control these facilities by remote control, an optical system is installed in a sewerage pipe. 2. Description of the Related Art Communication lines such as communication cables have been installed.

In response to the coming mass information society,
It is also considered to install an optical communication cable in the sewer pipe and guide the optical communication cable to each door through the branch pipe of the sewer pipe to construct an optical communication network.

[0004] The sewer pipe has a tree-like pipe system from each terminal home or office to the treatment plant, and the sewer pipe overflows even when a large amount of wastewater or rainwater flows in at once. A pipe with a sufficiently large diameter is used so that there are no openings, and there are many openings such as manholes and sewage tanks in the pipeline system. Optimal.

[0005]

The sewer pipe is
As described above, since the pipe diameter is larger than the amount of sewage flowing normally, the sewage flows at the bottom of the pipe, and the top of the pipe is empty. Therefore, when installing the optical communication cable in the sewer pipe, it is preferable to arrange the optical communication cable along the upper wall surface of the sewer pipe.

However, since the optical communication cable has considerable rigidity and is difficult to bend, if the optical communication cable is to be installed on a path extending from a manhole near the end of a sewer pipe to a sewage cell in a door-to-door manner, the optical communication cable may have many bent portions. , And it is difficult to properly arrange them along the upper part of the pipe.

[0007] A rigid protective tube is laid along the route in which the optical communication cable is laid, and the optical communication cable can be inserted into the protective tube to be disposed above the sewer pipe. It is extremely difficult to construct a rigid protective pipe such as a metal pipe at a location from the main pipe of a sewer pipe to a branch pipe.

The present invention has been made in view of the above circumstances, and has as its object to provide a method for laying a rigid protective pipe along a route for laying an optical communication cable in a sewer pipe. It is. It should be noted that the present invention is not limited to the implementation for the above purpose, but can be generally implemented as a method for laying a pipe along a predetermined path.

[0009]

According to the present invention, an inner tube having a flexible airtight coating layer formed on the inner surface of a tubular fabric is inserted inside a flexible airtight outer tube. Forming a tube,
A reaction curable resin liquid is injected between the outer tube and the inner tube in the double tube, and after arranging the double tube along a predetermined path, a pressure fluid is fed into the inner tube to form a double tube. The tube is expanded to have a circular cross section, and the reaction curable resin liquid is cured.

[0010] In the present invention, it is preferable that the outer tube is formed by forming a flexible airtight coating layer on the outer surface of a tubular fabric. Also, an intermediate layer made of a tubular fabric can be interposed between the outer tube and the inner tube.

In the present invention, the tube may be a protective tube through which a cable such as an optical communication cable is inserted. Further, the predetermined route may be formed along a top wall surface from the manhole in the sewer pipe to the sewage tank in each door via the sewer main pipe and the branch pipe.

In this case, the double pipe into which the reaction-curable resin liquid has been injected is disposed on a route from the manhole in the sewer pipe to the sewage tank of each door via the sewer main pipe and the branch pipe. The flexible pipe is inserted into the branch pipe from the branch while turning the flexible airtight tube under the fluid pressure, and the double pipe is pressed against the wall surface of the branch pipe by the turned airtight tube. After the reaction-curable resin liquid is cured, it is preferable to pull out the airtight tube from the branch tube while turning the tube upside down.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which a protective tube through which an optical communication cable is inserted is laid between a manhole of a sewer pipe and a sewage cell in a house according to the present invention.

Reference numeral 1 denotes a main pipe of a sewer pipe. The main pipe 1 has manholes 2 formed at appropriate intervals.
A branch pipe 4 from the branch section 5 of the main pipe 1 to the sewage tank 3 of each door is branched.

Reference numeral 6 denotes a protective tube for the optical communication cable 8, which is laid along the path from the manhole 2 via the main pipe 1 and the branch pipe 4 to the sewage tank 3 by the method of the present invention. Both ends are fixed to the manhole 2 and the wall surface of the sewage box 3 via fixing fittings 7.

FIG. 2 shows the protective tube 6 of the optical communication cable 8, in which an airtight coating layer 1 is formed on the outer surface of a tubular fabric 10.
1 is formed, and the inner tube 12 is formed by forming an airtight coating layer 14 on the inner surface of a tubular fabric 13 inserted into the outer tube 9 to form a double tube 15. Yes,
A reaction curable resin liquid is injected between the outer pipe 9 and the inner pipe 12 of the double pipe 15, and the resin liquid is hardened to form the inner pipe 1.
2 and the outer tube 9 form an integral rigid protective tube 6.

In order to lay the protection pipe 6 along a predetermined route of the sewer pipe, first, a double pipe 15 into which a reaction-curable resin liquid is injected between the outer pipe 9 and the inner pipe 12 is used. The main pipe 1 and the branch pipe 4 from the sewer manhole 2 by appropriate means.
Through the path leading to the sewage tank 3 through the.

At this stage, since the injected reaction curable resin liquid is in a liquid state and has not been cured yet, the double tube 15 is flexible and freely bends and is arranged along a desired path. be able to.

When the main pipe 1 between the manhole 2 and the branch portion 5 is short, both ends of the double pipe 15 are pulled in the manhole 2 and the sewage tank 3 so that the double pipe 15 is deflected upward. It is arranged along the upper part of the main pipe 1. In this method, when the double pipe 15 between the manhole 2 and the branch portion 5 is drooped excessively, the double pipe 15 at that portion is supported by appropriate means, And the double pipe 15 is arranged along the upper part of the main pipe 1.

The double pipe 15 inserted into the branch pipe 4
As shown in FIG. 3, while the double pipe 15 is biased toward the upper part of the branch pipe 4, the flexible airtight tube 16 is turned over by the fluid pressure so that the inside becomes outside, and the branch pipe 5 The double tube 15 is pressed against the wall surface of the branch tube 4 along the turned airtight tube portion and is made to follow it.

Thus, the double pipe 15 is connected to the manhole 2.
Is disposed along the path leading to the sewage cell 3 through the main pipe 1 and the branch pipe 4, and both ends of the manhole 2 and the sewage cell 3
Support on the inner wall of Thereafter, the double pipe 15 is expanded to have a circular cross section by applying a fluid pressure to the interior pipe 12, and the reaction curable resin liquid is cured in this state. In order to cure the resin liquid, it is preferable to feed a heating fluid into the interior pipe 12.

The airtight tube 16 inserted through the branch pipe 4
After the reaction-curable resin liquid is hardened, it is preferable to pull out the branch pipe 4 while turning it over so that the outside is inside, contrary to the above.

The double tube 15 of the present invention comprises an outer tube 9 having an airtight coating layer 11 formed on the outer surface of a tubular fabric 10 as described above, and an airtight coating layer formed on the inner surface of a cylindrical fabric 13. It is preferable that the inner tube 12 is formed of the inner tube 12, but the outer tube 9 is not necessarily formed of the tubular fabric 10 and the coating layer 11, but is formed of only the airtight coating layer 11. You may. In addition, as shown in FIG. 2C, an intermediate layer 17 of a tubular fabric is interposed between the outer pipe 9 and the inner pipe 12, and the thickness of the obtained protective pipe 6 is increased to secure high rigidity. Can also.

[0024]

In the present invention, the outer pipe 9 and the inner pipe 12 of the double pipe 15 are made of the tubular fabrics 10 and 13 and the flexible coating layer 1.
1 and 14, which are themselves flexible. Then, a reaction-curable resin liquid is injected between the outer pipe 9 and the inner pipe 12 of the double pipe 15, and the liquid is placed along a predetermined path. Can be arranged.

After arranging the double pipe 15 along a predetermined path and applying a fluid pressure to the inner pipe 12 of the double pipe 15, the double pipe 15 expands to have a circular cross section, The resin liquid is the coating layer 1 of the outer pipe 9 and the inner pipe 12.
1 and 14 and impregnated between the fibers of the tubular fabrics 10 and 13 and the intermediate layer 17.

When the reaction-curable resin liquid is cured in this state, the resin liquid is cured while impregnating the tubular fabrics 10 and 13, and the outer pipe 9 and the inner pipe 12 are integrated, and the double pipe 15 Forms a rigid tube. The tube is rigid and is held at a position along the path where the double tube 15 is arranged due to its rigidity.

Thus, the protection pipe 6 is laid on the path from the manhole 2 of the sewer pipe to the sewage tank 3, and the optical communication cable 8 is inserted into the protection pipe 6 from one end to extend over the entire length. The optical communication cable 8 is laid using a sewer pipe to form a network.

[0028]

According to the present invention, it is possible to easily lay a pipe along a complicatedly bent path such as a path from a manhole 2 of a sewer pipe to an individual sewage tank 3. When laying the pipe, the flexible double pipe 15 can be arranged along a free path, and the laid pipe is a rigid one mainly composed of a reaction-curable resin. , The laid route can be maintained.

Therefore, when the protection pipe 6 is laid on the path from the manhole 2 of the sewer pipe to the sewage tank 3, the protection pipe 6 is held in a bent shape along the path, and both ends of the protection pipe 6 are connected to the manhole 2 and the sewage tank 3. By fixing to 3, the whole can be held along a predetermined path.

By inserting the optical communication cable 8 through the protective tube 6, the optical communication cable 8 can be laid along a complicatedly bent path, and the laid path is changed to a sewer such as an upper part of a sewer pipe. The tube can be held in a position that does not impair the function.

Although the present invention is suitable as a method for laying the protective tube 6 of the optical communication cable 8 on the sewer pipe as described above, the present invention is not limited to the implementation for such a purpose, and it is generally a curved path. It can be widely applied as a method for laying a thin tube along.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a state in which a protection pipe for an optical communication cable is laid on a sewer pipe.

FIG. 2 shows a protective tube of an optical communication cable formed according to the present invention, wherein (a) is a partially exploded perspective view,
(B) is a cross-sectional view, and (c) is a cross-sectional view of a protective tube having an intermediate layer.

FIG. 3 is a central longitudinal sectional view showing a state in which a double pipe runs along a wall surface of a branch pipe of a sewer pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main pipe 2 Manhole 3 Dirty water rise 4 Branch pipe 5 Branch part 6 Protection pipe 8 Optical communication cable 9 Exterior pipe 10, 13 Cylindrical cloth 11, 14 Coating layer 12 Interior pipe 15 Double pipe 16 Airtight tube 17 Intermediate layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 1/08 H02G 1/08 A F term (Reference) 2D063 BA02 BA11 BA32 3H111 AA01 AA02 BA15 BA17 CB05 CB06 CB08 CB14 DA26 DB23 EA20 5G369 BA08 DC20

Claims (6)

[Claims] 1. Inside a flexible airtight outer tube (9),
Flexible airtight coating layer (14) on inner surface of tubular fabric (13)
A double-pipe (15) is formed by passing the inner pipe (12) formed with the resin, and a reaction-curable resin liquid is provided between the outer pipe (9) and the inner pipe (12) in the double pipe (15). After the double pipe (15) is arranged along a predetermined path, a pressure fluid is fed into the interior pipe (12) to expand the double pipe (15) into a circular cross section, A method of laying a pipe along a predetermined path, comprising curing the reaction-curable resin liquid. 2. The method according to claim 1, wherein the outer tube (9) is a tubular fabric (10).
The method for laying a pipe along a predetermined path according to claim 1, characterized in that a flexible airtight coating layer (11) is formed on an outer surface of the pipe. 3. The method according to claim 1, wherein an intermediate layer (17) made of a tubular fabric is interposed between the outer pipe (9) and the inner pipe (12). How to lay a pipe along a given path 4. The method of laying a pipe along a predetermined path according to claim 1, wherein the pipe is a protective pipe through which a cable is inserted. 5. The method according to claim 1, wherein the predetermined route is a route from the manhole (2) in the sewer pipe to the sewer main pipe (1) and the branch pipe (4).
, Leading to a separate sewage cell (3) through the upper wall surface, and formed along the upper wall surface thereof.
A method of laying a pipe along a predetermined path according to 2, 3, or 4 6. A double tube (1) into which a reaction curable resin liquid is injected.
5) From the manhole (2) in the sewer pipe, through the sewer main pipe (1) and the branch pipe (4), the sewage tank in each house (3)
, While biasing the double pipe (15) to the upper part of the branch pipe (4), and turning the flexible airtight tube (16) upside down with fluid pressure while branching (5).
From above, and the double tube (15) is pressed against the wall surface of the branch tube (4) by the inverted airtight tube (16) to cure the reaction-curable resin liquid. The method for laying a pipe along a predetermined path according to claim 5, characterized in that the pipe is removed from the branch pipe (4) after turning over the airtight tube (15).