JPH09314666A - Rehabilitation repair method for existing piping - Google Patents

Abstract

(57) An object of the present invention is to provide a method for rehabilitating and repairing existing pipes, which can prevent leakage fluid during work from flowing along the outer surface of an inner tube to an inner wall portion of an existing pipe. SOLUTION: A flexible lined tube 1 having an inner surface coated with an adhesive is inverted from one end of an existing pipe P by fluid pressure from the rear (or suction force from the front) so that the inner surface becomes the outer surface. It is introduced into the pipe, and the lining tube 1 is pressed against the inner surface of the existing pipe by the adhesive and the fluid pressure (or suction force). After the tip of the liner tube 1 comes out from the other end P'of the existing pipe 1, an instantaneous adhesive is applied between the outer surface of the inverted tube 1 and the inner surface of the existing pipe P near the other end, The outer surface of the inverted tube 1 is instantaneously fixed to the inner surface of the existing pipe P with respect to the other end P ′ of the pipe P, and then the heating fluid is circulated in the liner tube 1 to remove the adhesive. By promoting the curing, the lining tube 1 is fixed to the inner surface of the existing pipe P over the entire length thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating existing pipes, and more particularly to a method for rehabilitating existing pipes for the purpose of maintenance against deterioration of existing pipes such as gas pipes and water pipes.

[0002]

2. Description of the Related Art Various techniques have been developed and proposed so far as a technique for rehabilitating an existing pipe by laying it without digging. A lining technique is generally used as a technique for rehabilitating and repairing existing piping. For example, a lining method is known in which a flexible tube is drawn into a pipe and attached to the inner surface of the pipe. At present, this method has already been put to practical use as an effective repair technique for aging existing pipelines.

[0003] As one of the above-mentioned lining methods, an inverted lining method is applied.
In the reverse lining lining method, as shown in FIG. 2, a flexible inner lining tube 1 having an outer diameter substantially equal to the inner diameter of the pipe and containing an adhesive is reversed with respect to the existing pipe P so that the inner surface becomes the outer surface. While being introduced, the lining tube 1 is adhered to the inner surface of the existing pipe P by the above adhesive.

Specifically, an adhesive is previously sealed in the flexible lining tube 1, and one end of the lining tube 1 is annularly fixed to one end (not shown) of the existing pipe P. After that, a folded portion is formed on the tube 1, and a fluid pressure is applied to the formed folded portion so as to pressurize from the rear portion to the other end of the pipe line. Invert and introduce. in this way,
The folded portion is gradually advanced along the inside of the pipe from one end of the pipe to the other end, and the lining tube 1 is pressed against the inner surface of the pipe over the entire length of the existing pipe P by the fluid pressure and the adhesive.

After the tip of the lining tube 1 goes out of the other end P'of the existing pipe P as the lining tube 1 is turned over, the lining tube crimped to the inner surface of the existing pipe is heated. Circulation of the fluid is needed to accelerate the cure of the adhesive. When circulating the heating fluid, as shown in FIG. 3, a fluid circulator C (described in Japanese Patent Application No. 07-076622) is attached to the other end P ′ of the existing pipeline P. In addition, in order to facilitate the mounting of the fluid circulator C, the tip of the inverted lining tube 1 has the other end P ′ of the conduit.
Before coming out further, it is necessary to attach it to the other end P ′ of the conduit first.

The fluid circulator C has a cylindrical main body 22, and a cap portion 20 is provided on the upper end of the main body 22. A fluid introduction part 24 is attached to the side wall of the main body 22 so as to communicate with the inside of the main body via the side wall. Also,
Inside the lower end of the cylindrical body 22, a small-diameter tubular protrusion 26
Is being formed. Then, the socket portion 30 is screwed onto the outer peripheral surface of the lower portion of the cylindrical main body 22, but before such screwing, the connection portion 28 that can be connected to the pipeline is inserted into the socket portion 30. I keep it. The connection portion 28 can be mounted in the socket portion 30 by the flange portion (not shown) formed on the inner peripheral surface of the socket portion 30 and the flange portion (not shown) formed on the outer peripheral surface of the connection portion 28. There is.

When the fluid circulator C is attached to the end P'of the existing pipeline, the connection 28 is screwed onto the end P'of the existing pipe P with the circulator C itself assembled as shown in FIG. Let it stick together. After that, the tip of the lining tube 1 comes out from the other end P ′ of the existing pipe P, passes through the reduced diameter portion 28b of the connection portion 28 and the small-diameter tubular protrusion 26, and seals the cylindrical body 22. Enclosed in space.

Next, by rotating the socket portion 30, the small-diameter tubular projection portion 26 approaches the reduced diameter portion 28b of the connection portion 28, and the portion of the lining tube 1 exposed between the two is crushed. Thus, the fluid flowing outside can be stopped through the gap between the inner surface of the tubular protrusion 26 and the outer surface of the tube 1. In the drawing, reference numeral 1a shows the lining tube 1 at a portion sandwiched between the reduced diameter portion 28b and the tubular projecting portion 26.

After the fluid is cut off, the cutter 25 is projected into the cylindrical main body 22 by grasping and rotating the rotating portion 24a to make a hole in the lining tube 1. Thereafter, when the valve 27 is opened, the heating fluid L can flow into the lining tube 1 via the fluid introduction part 24 and circulate.

By circulating the heating fluid in the inner lining tube 1 which is inverted and inserted into the existing pipe P, the curing of the adhesive is promoted, and the lining tube 1 and the inner wall of the existing pipe P are securely bonded. , The quality of the reverse lining lining construction is improved.

[0011]

However, the above-mentioned conventional rehabilitation repair method has the following problems. That is, by rotating the socket portion 30 to bring the small-diameter tubular protrusion portion 26 closer to the reduced diameter portion 28b of the connection portion 28 and crushing the portion of the lining tube 1 exposed between the two, Tubular protrusion 2
It is difficult to completely block the fluid flowing to the outside through the gap between the inner surface of 6 and the outer surface of the tube 1.

For this reason, the fluid (in a pressured state) flowing from the inside of the lining tube 1 to the cylindrical main body 22 flows along the outer surface of the tube 1 to the inner wall portion of the existing pipeline P, so that the lining tube Bonding (because the adhesive has not yet hardened) between the outer surface of 1 and the inner surface of the existing pipeline P cannot be performed.

Further, the heated fluid (in a state where pressure is applied) flowing into the lining tube 1 from the outside through the fluid introducing portion 24 may leak to the outer surface of the tube 1. Since this fluid flows along the outer surface of the tube 1 to the inner wall portion of the existing pipeline P, the bonded state between the outer surface of the lining tube 1 and the inner surface of the existing pipeline P (because the adhesive has not cured) ) Is destroyed even worse.

Therefore, it is an object to prevent the fluid from the lining tube 1 and the heating fluid from the outside from flowing to the inner wall portion of the existing pipeline P along the outer surface of the tube 1. .

The present invention has been made to solve the above problems, and prevents leakage fluid from flowing to the inner wall portion of an existing pipeline along the outer surface of the lining tube.
It is an object of the present invention to provide a method for rehabilitating an existing pipe for reliably fixing the lining tube to the inner surface of the existing pipe.

[0016]

In order to achieve the above-mentioned object, the present invention provides a method for rehabilitating an existing pipe in which a flexible lining tube is adhered to an inner surface of the existing pipe. A flexible lining tube having a substantially equal outer diameter is introduced into the pipe while reversing it so that the inner surface becomes the outer surface, and the lining tube is attached to the inner surface of the existing pipe with an adhesive, and the tip of the lining tube is attached to the existing pipe After exiting from the other end, an instantaneous adhesive is applied between the outer surface of the inverted tube near the other end and the inner surface of the existing pipe, and the inverted tube is applied to the other end of the existing pipe. Momentarily adhere the outer surface of the to the inner surface of the existing pipe, then
The lining tube is fixed to the inner surface of the pipe over the entire length of the existing pipe by circulating a heating fluid in the lining tube to promote the curing of the adhesive.

Here, the instant adhesive is an organic adhesive, more specifically, a cyanoacrylate adhesive, and for example, an α-cyanoacrylate adhesive can be used.

[0018]

According to the above-mentioned solution means, a flexible lined tube having an outer diameter substantially equal to the inner diameter of the pipe is introduced into the pipe from one end of the existing pipe while being turned over so that the inner surface becomes the outer surface. The inner tube is attached to the inner surface of the existing tube. After the tip of the lining tube comes out from the other end of the existing pipe, an instantaneous adhesive is applied between the outer surface of the inverted tube and the inner surface of the existing pipe near the other end of the pipeline. As a result, at the other end, the outer surface of the inverted tube and the inner surface of the existing pipe can be fixed instantaneously, and the leakage fluid flows along the outer surface of the lining tube to the inner wall portion of the existing pipeline. And the inner tube can be securely fixed to the inner surface of the pipe by the adhesive over the entire length of the existing pipe.

[0019]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 3. The existing pipe rehabilitation repair method of the present invention,
Most of the steps are performed in the same manner as the above conventional method. That is, the flexible liner tube 1 having an outer diameter substantially equal to the inner diameter of the pipe and having an adhesive enclosed therein is introduced into the existing pipe P while being inverted so that the inner surface becomes the outer surface. The lining tube 1 is adhered to the inner surface of the existing pipe P.

Specifically, the adhesive is previously sealed in the flexible lining tube 1, and one end of the lining tube 1 is annularly fixed to one end (not shown) of the existing pipe P. After that, a folded portion is formed on the tube 1, and a fluid pressure is applied to the formed folded portion so as to pressurize from the rear portion to the other end of the pipe (or from the front thereof to the inside of the pipe from the other end of the pipe). Lining tube 1)
Is inverted into the tube so that its inner surface is the outer surface.
In this way, the folded portion is gradually advanced from one end of the conduit to the other end along the inside of the pipe, and the lining tube 1 is extended over the entire length of the existing pipe P by the fluid pressure (or suction force) and the adhesive. Crim the surface.

As the lining tube 1 is reversed, the tip of the tube comes out from the other end P'of the existing pipe P to the outside of the pipe, and then the outer surface of the inverted tube 1 near the other end P'and the existing pipe P ' Instant adhesive is applied to the inner surface of the pipe P. Therefore, the outer surface of the inverted tube 1 and the inner surface of the existing pipe P can be instantaneously fixed to the other end P ′ of the existing pipe P.

Here, the instant adhesive is an organic adhesive, more specifically, a cyanoacrylate adhesive, and for example, an α-cyanoacrylate adhesive can be used.

Next, similarly to the conventional method shown in FIG. 3, the fluid circulator C is attached to the other end P'of the conduit.

Similar to the conventional method, the fluid circulator C
Has a cylindrical main body 22, and a cap portion 20 is provided on the upper end of the main body 22. A fluid introduction part 24 is attached to the side wall of the main body 22 so as to communicate with the inside of the main body via the side wall. A small-diameter tubular protrusion 26 is formed inside the lower end of the cylindrical body 22. Then, the socket portion 30 is screwed onto the outer peripheral surface of the lower portion of the cylindrical main body 22, but before such screwing, the connection portion 28 that can be connected to the pipeline is inserted into the socket portion 30. I keep it. The connecting portion 28 is formed by the flange portion (not shown) formed on the inner peripheral surface of the socket portion 30 and the flange portion (not shown) formed on the outer peripheral surface of the connecting portion 28.
It can be installed within 0.

When the fluid circulator C is attached to the end P'of the existing pipe, the connecting portion 28 is connected to the end P'of the existing pipe P with the circulator C itself assembled as shown in FIG. Secure by screwing.

At the same time when the fluid circulation tool C is attached to the conduit, the tip end portion of the lining tube 1 is connected to the reduced diameter portion 28b of the connecting portion 28.
And the small-diameter tubular protrusion 26 are passed through, respectively, and sealed in the closed space of the cylindrical main body 22.

Next, by rotating the socket portion 30, the small-diameter tubular projecting portion 26 approaches the reduced diameter portion 28b of the connecting portion 28, and the portion of the lining tube 1 exposed between the two is crushed. Thus, the fluid flowing outside can be stopped through the gap between the inner surface of the tubular protrusion 26 and the outer surface of the tube 1. In the drawing, reference numeral 1a shows the lining tube 1 at a portion sandwiched between the reduced diameter portion 28b and the tubular projecting portion 26.

After the fluid is cut off, the cutter 25 is projected into the cylindrical main body 22 by grasping and rotating the rotating portion 24a, and a hole is formed in the lining tube 1. Thereafter, when the valve 27 is opened, the heating fluid L can flow into the lining tube 1 via the fluid introduction part 24 and circulate.

By circulating the heating fluid in the lining tube 1 which is inverted and inserted into the existing pipe P, the hardening of the adhesive is promoted and the lining tube 1 and the inner wall of the existing pipe P are securely bonded. , The quality of the reverse lining lining construction is improved.

As described above, since the instantaneous adhesive is applied between the outer surface of the inverted tube 1 and the inner surface of the existing pipe P near the other end P'of the conduit, the other end P ' In the vicinity of, the inverted outer surface of the tube 1 can be instantaneously fixed to the inner surface of the existing pipe P. Therefore, even when the fluid (pressure is applied) flowing out from the inside of the lining tube 1 to the cylindrical main body 22 flows downward along the outer surface of the tube 1, the lining tube is also passed from the outside through the fluid introducing portion 24. Even when the heated fluid (in a state where pressure is applied) flowing into 1 leaks to the outer surface of the tube 1 and flows downward along the outer surface of the tube 1, the leaked fluid flows along the outer surface of the inner tube 1. As a result, it is prevented from flowing into the inner wall portion of the existing pipeline P.

Therefore, there is no fear that the bonded state between the outer surface of the lining tube 1 and the inner surface of the existing pipeline P is destroyed. After that, the heating fluid is circulated in the lining tube 1 to accelerate the curing of the adhesive, so that the lining tube 1 can be securely fixed to the inner surface of the pipe over the entire length of the existing pipe P.

[0032]

According to the present invention, from one end of the existing pipe,
A flexible lined tube with an outer diameter that is almost equal to the inner diameter of the tube and coated with an adhesive on the inner surface is introduced into the tube by inverting it so that the inner surface becomes the outer surface by fluid pressure from the rear (or suction force from the front) Then, the lining tube is pressed against the inner surface of the existing pipe by the adhesive and the fluid pressure (or suction force). After the tip of the lining tube comes out from the other end of the existing pipe, an instantaneous adhesive is applied between the outer surface of the inverted tube and the inner surface of the existing pipe near the other end of the pipeline. As a result, at the other end, the outer surface of the inverted tube and the inner surface of the existing pipe can be fixed instantaneously, and the leakage fluid flows along the outer surface of the lining tube to the inner wall portion of the existing pipeline. And the inner tube can be securely fixed to the inner surface of the pipe by the adhesive over the entire length of the existing pipe.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for rehabilitating an existing pipe according to the present invention.

FIG. 2 is an explanatory view showing a method for rehabilitating existing pipes according to a conventional technique.

FIG. 3 is an explanatory diagram showing a method for rehabilitating existing pipes according to the present invention and the prior art.

[Explanation of symbols]

 P Existing pipe P'The other end of the pipe C Fluid circulation tool 1 Lined tube 1a Part where the lined tube is sandwiched 2 Instant adhesive 20 Cap part 22 Cylindrical body 24 Fluid introduction part 24a Rotating part 25 Cutter 26 Tubular protrusion 27 Valve 28 Connection part 28b Reduced diameter part 30 Socket part

Claims (4)

[Claims] 1. A method for rehabilitating an existing pipe in which a flexible lining tube is adhered to an inner surface of an existing pipe, wherein a flexible lining tube having an outer diameter substantially equal to the inner diameter of the pipe is formed on an outer surface from one end of the existing pipe. Introduced into the pipe while reversing so that the above lining tube is attached to the inner surface of the existing pipe with an adhesive, the tip of the lining tube comes out from the other end of the existing pipe, and is then inverted near the other end Applying an instantaneous adhesive between the outer surface of the tube and the inner surface of the existing pipe, with respect to the other end of the existing pipe, the outer surface of the inverted tube is momentarily fixed to the inner surface of the existing pipe, then, A method for rehabilitating and repairing an existing pipe, characterized in that the lining tube is fixed to the inner surface of the pipe over the entire length of the existing pipe by promoting the curing of the adhesive by circulating a heating fluid in the pipe. 2. The method for rehabilitating existing pipes according to claim 1, wherein the instant adhesive is an organic adhesive. 3. The method for rehabilitating existing pipes according to claim 2, wherein the instant adhesive is a cyanoacrylate adhesive. 4. The method for rehabilitating existing pipes according to claim 3, wherein the instant adhesive is an α-cyanoacrylate type adhesive.