JP2843930B2 - Pipe line lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining method for a pipeline, and more particularly to a lining method adapted to a pipeline having a step portion in a pipeline, which is connected by a connecting member such as a socket or an elbow.

[0002]

2. Description of the Related Art Conventionally, as a lining method for an inner surface of a pipeline, there is a method in which a liquid resin and a pig are inserted into the pipeline, and the pig is run by fluid pressure from the rear to form a lining film on the inner surface of the pipeline. Are known. In one of the conventional examples, for example, as shown in FIG. 4A, a resin d is interposed between a front pig b and a rear pig c from a starting end of a pipe a and inserted into the pipe a. Front pig b and rear pig c by fluid pressure
, A lining film e thinner than the sagging limit film thickness is formed in the conduit a. Then, as shown in FIG. 4B, a pig f is inserted from the beginning of the pipe a for finishing the surface of the lining film e, and the pig f is run.
Voids and pinholes on the film surface are removed (as described in JP-A-60-172383).

[0005] As another conventional example, as shown in FIG. 5, a small-diameter pig b smaller than the leveling pig c is disposed in front of the leveling pig c, and both are connected by a wire g or the like to form a two-piece pig. A pig is formed, and the double pig is inserted from the beginning of the pipe a so that the small-diameter pig becomes the head together with the resin d. And 2
By running a series of pigs, the leading small-diameter pig b forms a relatively thick lining film, and the rear leveling pig c smoothes the film surface while removing voids and pinholes on the film surface. Are known.

[0004]

By the way, the above-mentioned pipe is laid by connecting a plurality of pipes with connecting members such as sockets or elbows. The inside diameter of the connection member such as the socket and the elbow is usually about 20% larger than the inside diameter of the pipe, and as shown in FIG. 6, a step is inevitably generated at the connection with the pipe. When such a pipeline is lined by the above-described conventional method, since the lining direction is one direction, even if the resin can enter the step portion on the front side in the traveling direction and apply the resin, The step on the rear side in the traveling direction becomes a blind spot, and there is a problem that the step of the blind spot remains unpainted.

The present invention has been proposed in order to solve these problems. The present invention has been proposed to solve the problem of smoothing a pipe including a step formed by connecting a connecting member such as a socket and an elbow without leaving unpainted portions. It is an object of the present invention to provide a lining method of a pipeline for forming a simple lining film.

[0006]

In order to achieve the above-mentioned object, the present invention provides a laying pipe having a first opening on one side and a second opening on the other side, and a liquid resin from one opening. And introducing a pig, a pressure difference is generated between the first opening and the second opening in the pipeline, and the pig is moved by the pressure difference, whereby a lining film having a set thickness is formed on the inner surface of the pipeline. In the inner lining method of a pipe to be formed, the lining step is divided into a first step and a second step. In the first step, the lining film having the set thickness is formed in the pipe with the first opening as a starting end. Is introduced by introducing a larger amount of liquid resin than is necessary for forming the lining film and a small-diameter pig having a diameter smaller than the diameter required for forming the lining film having the set thickness.
By moving the lining film into the pipe from the opening to the second opening, the lining film having a thickness larger than the set thickness is formed in the pipe, and the lining film is formed. Introducing a second pig of a predetermined diameter corresponding to the formation of the lining film of the set thickness into a passage, and moving the second pig into a conduit leading to a first opening, the first step The pipe is formed without causing a coating blind spot on the front side and the rear side in the advancing direction even with respect to the inner step portion of the pipe due to the connecting member interposed in the middle of the pipe while advancing while flattening the thick adhered resin applied on the inner surface of the pipe. The present invention is characterized in that it is constructed so as to form a lining film having a set thickness on the inner surface of a road.

[0007]

According to the inner lining method as described above, when a connecting member such as a pipe joint is interposed in the middle of a construction pipeline and has a step in the pipeline, the connection is required during the construction in the first step. Even if the resin blind does not enter the inner step portion of the pipe on the rear side in the advancing direction when the pig passes through the member and the coating blind spot occurs, the coating blind spot is reduced during the resin smoothing step in the second step. Is applied so as to penetrate into the inner step of the pipe, so that the lining can be performed without leaving uncoated resin in the pipe. Further, since the thick lining film formed in the first step is pressed and flattened in the second step, the introduction of the resin into the pipe only needs to be performed at the start of the first step. There is no need to introduce new resin into the pipe.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a pipeline for performing an inner surface lining method of a pipeline according to the present invention. The pipeline 1 is formed by connecting a plurality of pipes 11 by connecting members 2 such as a socket 21 and an elbow 22. ing. As the connecting means between the pipe 11 and the connecting member 2, an inner diameter of the connecting member 2 is formed to be about 20% larger than an inner diameter of the pipe 11, and a male screw is formed at an outer peripheral end of the pipe 11. , The socket 2
Since a female screw is formed at the end of the inner peripheral surface of the connecting member 2 such as the elbow 22 and the like, the pipe 11 and the connecting member 2 are connected by screwing the male screw and the female screw. Road 1 is formed. Here, the inner diameter of the tube 11 and the socket 2
Since the inner diameter of the connecting member 2 such as the elbow 22 is different from that of the connecting member 2, as shown in FIG.
b occurs. The first opening 12 is provided in one of the pipes 1.
On the other hand, a second opening 13 is opened, and a flow rate / pressure regulator 3, a flow rate / pressure gauge 4, and a pump 5 are connected to the openings during lining, respectively. , A pressure difference is generated between the first opening 12 and the second opening 13 in the pipeline 1.

The pipe inner lining method according to the present invention is a process for forming a smooth set lining film having a thickness W over the entire inner surface of the pipe 1 including the steps 2a and 2b. Is divided into a first step and a second step. First, as a first step, in order to form a lining film having a thickness W1 larger than the set lining film thickness on the inner surface of the pipeline 1, the first opening 12 is used as a starting end side and the second opening is formed from the first opening 12. The forward process lining is constructed in the pipeline 1 leading to 13. As a method, first, the pipe 1 is opened through the first opening 12.
A liquid resin 6 such as epoxy is introduced into the inside, and then a small-diameter pig 7 having a large clearance with the inner surface of the pipe 1 is provided.
Is introduced. Here, the amount of the liquid resin 6 is, for example, the minimum amount of the resin of W (RW) πL is required when a set lining film having a thickness W is formed in the pipe 1 having an overall length L and an inner diameter R. become. In the first step, to form a lining film having a thickness W1 larger than the lining film having the thickness W, W1 (R
-W1) A larger amount of liquid resin 6 than πL is introduced into the pipeline 1. The small-diameter pig 7 has a spherical shape and a thickness W.
1 to form a lining film (R-2
W1).

When the introduction of the liquid resin 6 and the small-diameter pig 7 is completed, the first opening 12 is pressurized by the pump 5, and the second opening 13 is depressurized by the pump 5. A required pressure difference is generated between the first opening 12 and the second opening 13 with the liquid resin 6 and the small-diameter pig 7 interposed therebetween. Then, the liquid resin 6 and the small-diameter pig 7 are
As shown in (A) and (B), the first
A lining film 14 having a thickness W1 is formed on the inner surface of the pipeline 1 while moving from the opening 12 side to the second opening 13 side. By the way, when the lining film is formed on the inner surface of the connection member 2 such as the socket 21 and the elbow 22 in the pipeline 1, the steps 2a, 2b
Although the liquid resin 6 enters the step portion 2b on the front side in the traveling direction and the resin 6 can be applied, as shown in FIG. In addition, the step 2a on the rear side in the traveling direction of the liquid resin 6 becomes a coating blind spot, and as shown in FIG. This unpainted portion will be described in the second
A lining film is formed to fill in the process.

As a second step, in order to form a set lining film 15 having a thickness W over the entire inner surface of the pipeline 1 while flattening the lining film 14 having a thickness W1 formed in the first step, With the second opening 13 side as the starting end side, the second
The return process lining is applied to the inside of the pipeline 1 from the opening 13 to the first opening 12. As the method, the second opening 1
3 introduces a second pig 8 having an outer diameter (R-2W) corresponding to the formation of the setting lining film 15 in the pipeline 1. And the 2nd opening part 13 side is pressurized with the pump 5,
Further, the pressure on the first opening 12 side is reduced by the pump 5, and the first opening 12 side and the second opening 1
A pressure difference is created between the three sides. Then, as shown in FIG. 3, the second pig 8 moves from the second opening 13 side in the opposite direction to the first step to the first opening 12 side due to the pressure difference. At this time, as shown in FIG. 3 (A), the second pig 8 moves while flattening the lining film 14 having the thickness W1 formed in the first step lining of the first step, and the second pig 8 A setting lining film 15 having a height W is formed. When the lining film is formed on the inner surface of the connection member 2, as shown in FIG. 3 (B), the step 2a, which has become the application blind spot in the first step, is on the front side in the traveling direction in the second step. The pressed liquid resin 6 enters the step 2a, and as a result, a smooth set lining film 15 is formed over the entire inner surface of the pipeline 1 including the steps 2a and 2b.

As described above, in the present embodiment, the liquid resin 6 and the small-diameter pig 7 are moved from the first opening 12 to the second opening 13 in the first step, so that the liquid resin 6 and the small-diameter pig 7 are set on the inner surface of the pipeline 1. Lining film 14 thicker than lining film 15
Is formed, and the second pig 8 is moved from the second opening 13 side to the first opening 12 side in the second step, so that the thick lining film 14 formed in the first step is leveled and the pipeline is moved. The setting lining film 15 is formed on the inner surface of the substrate 1. During the construction of the first step, the step 2a on the rear side in the traveling direction among the steps 2a and 2b of the connecting member 2 interposed in the middle of the pipeline 1
Even when the application blind spot occurs without the liquid resin 6 entering, the application blind spot is applied so that the resin 6 enters the step portion 2a during the leveling step of the resin 6 in the second step. The lining work can be performed without causing the resin to be left uncoated on the inner surface of the pipeline 1.

In this embodiment, the first opening 12 and the second opening 12 are provided.
The flow rate / pressure regulator 3, the flow rate / pressure gauge 4, and the pump are connected to the openings 13, and the pig is moved by generating a differential pressure in the pipeline 1, but the present invention is not limited to this. Instead, a flow rate / pressure regulator 3, a flow rate / pressure gauge 4, and a pump may be connected to one of the openings, and a differential pressure may be generated in the pipe 1 by opening the other end to the atmosphere. In this case, simplification of the apparatus can be expected.

[0014]

As described above, according to the present invention, even if resin blind does not enter into the inner step portion of the pipe on the rear side in the advancing direction during application of the first step, even if application blind spot occurs, Since the resin is applied so as to enter the application blind spot in the resin smoothing step in the second step, the lining work can be performed without the resin being left uncoated in the pipeline. As a result, it is possible to form a smooth lining film over the entire inner surface of the pipeline on which the lining is to be applied, without leaving unpainted portions. Further, since the thick lining film formed in the first step is pressed and flattened in the second step, it is not necessary to introduce a new resin into the pipe at the start of the second step. Workability is improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a pipeline.

FIG. 2A is an explanatory view of a first step. FIG. 2B is an explanatory view of a first step.

FIG. 3A is an explanatory view of a second step. FIG. 3B is an explanatory view of a second step.

FIG. 4A is an explanatory view of a conventional example. FIG. 4B is an explanatory view of a conventional example.

FIG. 5 is an explanatory view of a conventional example.

FIG. 6 is an explanatory diagram of a problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 11 Pipe 12 1st opening 13 2nd opening 14 Thick lining film 15 Setting lining film 2 Connecting member 2a Step 2b Step 21 Socket 22 Elbow 3 Flow rate / pressure regulator 4 Flow rate / pressure gauge 5 Pump 6 Liquid resin 7 Small diameter pig 8 Pig W Setting lining film thickness W1 Lining film thickness L Pipe length R Pipe inner diameter

Claims (1)

(57) [Claims] 1. A laying pipeline having a first opening on one side and a second opening on the other side. Liquid resin and pig are introduced from one opening, and the first opening and the second opening in the pipeline are provided. A pressure difference is generated between the two openings, and the pig is moved by the pressure difference to form a lining film having a predetermined thickness on the inner surface of the pipe. Step 1 is divided into a step and a second step.
Introducing a larger amount of liquid resin than the amount required to form the lining film of the set thickness and a small-diameter pig having a diameter smaller than the diameter required to form the lining film of the set thickness,
By moving the small-diameter pig into a pipe extending from the first opening to the second opening, the pig is formed while forming a lining film thicker than a set thickness in the pipe, and in the second step, the second opening is formed. When a second pig having a predetermined diameter corresponding to the formation of the lining film having the set thickness is introduced into the pipeline with the portion as the starting end, and the second pig is moved into the pipeline leading to the first opening, In the first step, the thick adhered resin applied on the inner surface of the pipe applied in the first step is advanced while being leveled. An inner lining method for a pipeline, wherein the lining is formed so as to form a lining film having a predetermined thickness on the inner surface of the pipeline without generating a blind spot.