JPH09314665A - 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). Before or after the tip of the lining tube 1 comes out from the other end P ′ of the existing pipe, the pipe wall near the other end is heated to remove the inverted outer surface of the tube at the other end of the existing pipe. Fix it to the inner surface of the existing pipe within a short time. Then, lining tube 1
The lining tube 1 is fixed to the inner surface of the existing pipe P over the entire length of the existing pipe P by circulating the heating fluid therein to promote the hardening of the adhesive.

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 A lining technique is generally used as a technique for rehabilitating existing pipes. For example, a lining lining method is known in which a flexible tube is drawn into the 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. 3, a flexible 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. 4, 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 connecting portion 28 can be mounted in the socket portion 30 by a flange portion (not shown) formed on the inner peripheral surface of the socket portion 30 and a flange portion (not shown) formed on the outer peripheral surface of the connecting portion 28. It has become.

When the fluid circulator C is attached to the end P'of the existing pipeline, the connecting part 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. Thereafter, the distal end of the lining tube 1 comes out from the other end P ′ of the existing pipe P, and
It passes through 8b and the small-diameter tubular protrusion 26, and is sealed in the closed space of the cylindrical main body 22.

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, 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.

[0012]

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.

[0017]

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. Before or after exiting from the other end, the pipe wall near the other end is heated to fix the outer surface of the tube inverted at the other end of the existing pipe to the inner surface of the existing pipe within a short time, After that, a heating fluid is circulated in the lining tube to accelerate the curing of the adhesive, thereby fixing the lining tube to the inner surface of the pipe over the entire length of the existing pipe.

The above-mentioned heating is preferably performed from the outside to the pipe wall near the other end of the existing pipe.

[0019]

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. Before or after the tip of the lining tube comes out from the other end of the existing pipe, the pipe wall near the other end is heated, and the outer surface of the inverted tube at the other end of the existing pipe is used as the inner surface of the existing pipe. Fix within a short time. This prevents the leaking fluid from flowing along the outer surface of the inner lining tube to the inner wall of the existing pipeline, and then circulates the heating fluid in the inner lining tube to promote curing of the adhesive and thereby to secure the inner lining tube. It becomes possible to securely fix the existing pipe to the inner surface of the pipe over the entire length.

[0020]

Embodiments of the present invention will be described below with reference to FIGS. In the existing pipe rehabilitation construction method of the present invention, most of the steps are performed in the same manner as the conventional construction method. That is, with respect to the existing pipe P, a flexible liner tube 1 having an outer diameter substantially equal to the inner diameter of the pipe and encapsulating an adhesive.
Is introduced into the pipe while reversing it so that the inner surface becomes the outer surface, and the lining tube 1 is attached to the existing pipe P by the adhesive.
To the inner surface of the.

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 shown in FIG. 1 (first embodiment of the present invention), before 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, Heat the pipe wall near the other end. When the tip of the lining tube 1 comes out of the other end P ′ of the existing pipe to the outside of the pipe, the heated pipe wall causes the outer surface of the tube 1 inverted at the other end P ′ of the existing pipe to become the existing pipe P ′. It will be fixed to the inner surface of the in a short time.

Alternatively, as shown in FIG. 2 (second embodiment of the present invention), after the tip end of the tube comes out from the other end P ′ of the existing pipe P along with the reversal of the lining tube 1, The wall surface of the pipe near the other end is heated. By such heating, the adhesive interposed between the outer surface of the inverted tube 1 near the other end and the inner surface of the existing pipe P is heated and inverted at the other end P ′ of the existing pipe. The outer surface of the tube 1 is fixed to the inner surface of the existing pipe P within a short time.

The above heating is preferably performed on the existing pipe P.
Is performed from the outside to the pipe wall near the other end P'of For example, using an appropriate heater, the existing pipe (metal) P
It is possible to apply an appropriate amount of heat from each direction to the outer peripheral surface of the other end portion P'of. Due to the heat effect of the heating performed in this way, the adhesive agent interposed 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 existing pipe is rapidly cured. To do. Therefore, at the other end P ′ of the existing pipe, the inverted outer surface of the tube 1 can be quickly fixed to the inner surface of the existing pipe P.

Next, as in the conventional method shown in FIG. 4, 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 connection portion 28 can be mounted in the socket portion 30 by a flange portion (not shown) formed on the inner peripheral surface of the socket portion 30 and a flange portion (not shown) formed on the outer peripheral surface of the connection portion 28. It has become.

When the fluid circulator C is attached to the end P'of the existing pipeline, the connecting portion 28 is connected to the end P'of the existing pipe P in a state where the circulator C itself is 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 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 shut 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 has been inverted and inserted into the existing pipe P, the curing of the adhesive is promoted, and the adhesion between the lining tube 1 and the inner wall of the existing pipe P is ensured. The quality of the reversing lining construction is improved.

As described above, due to the thermal effect of the heating applied to the wall portion of the other end P'of the pipe, the pipe is interposed between the outer surface of the inverted tube 1 and the inner surface of the pipe near the other end P'of the pipe. Since the applied adhesive cures quickly, the outer surface of the inverted tube 1 can be fixed to the inner surface of the existing pipe P at the other end P ′ of the existing pipe in a short time.

As a result, the fluid flowing from the inside of the lining tube 1 to the cylindrical main body 22 (in a state where pressure is applied)
When the air flows downward along the outer surface of the tube 1, the heating fluid flowing from the outside into the lining tube 1 through the fluid introducing portion 24 (in a state where pressure is applied)
However, even if the fluid leaks to the outer surface of the tube 1 and flows downward along the outer surface of the tube 1, the leaked fluid is prevented from flowing to the inner wall portion of the existing pipeline P along the outer surface of the lining tube 1.

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 will be broken. 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.

[0036]

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). Before or after the tip of the lining tube comes out from the other end of the existing pipe, the pipe wall near the other end is heated, and the outer surface of the inverted tube at the other end of the existing pipe is used as the inner surface of the existing pipe. Fix within a short time. This prevents leaking fluid from flowing along the outer surface of the inner lining tube to the inner wall of the existing pipeline, and circulates the heating fluid in the inner lining tube to accelerate the curing of the adhesive so that the inner lining tube is not installed. It becomes possible to securely fix the pipe to the inner surface thereof over the entire length of the pipe.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of a method for rehabilitating existing pipes according to the present invention.

FIG. 2 is an explanatory diagram showing a second embodiment of the method for rehabilitating existing pipes according to the present invention.

FIG. 3 is an explanatory diagram showing a method for rehabilitating existing pipes according to a conventional technique.

FIG. 4 is an explanatory diagram showing a method for rehabilitating existing pipes according to the present invention and the prior art.

[Explanation of reference symbols] P existing pipe P'other end of pipe C fluid circulating tool 1 lining tube 1a sandwiched portion of lining tube 20 cap portion 22 cylindrical body 24 fluid introducing portion 24a rotating portion 25 cutter 26 tubular protruding portion 27 Valve 28 Connection 28b Reduced Diameter 30 Socket

Claims (2)

[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. Introducing into the pipe while reversing so that the above-mentioned lining tube is attached to the inner surface of the existing pipe with an adhesive, and before or after the tip of the lining tube comes out from the other end of the existing pipe, the pipe near the other end The wall surface is heated to fix the outer surface of the inverted tube at the other end of the existing pipe to the inner surface of the existing pipe within a short time, and then the heating fluid is circulated in the lining tube to cure the adhesive. A method for rehabilitating existing pipes, characterized in that the inner lining tube is fixed to the inner surface of the pipe over the entire length of the existing pipe by promoting the above. 2. The method for rehabilitating existing pipes according to claim 1, wherein the heating is performed externally to the pipe wall near the other end of the existing pipe.