JPH07204580A - Pipe line lining method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pipeline lining method for forming a smooth lining film in a pipeline including a step portion generated by connection of a connecting member such as a socket or an elbow without leaving unpainted portion. The purpose is to do. [Structure] By moving the liquid resin 6 and the small-diameter pig 7 from the first opening 12 side to the second opening 13 side in the first step, a lining thicker than the thickness of the set lining film 15 is formed on the inner surface of the conduit 1. The film 14 is formed, and the second pig 8 is formed in the second step.
Is moved from the second opening 13 side to the first opening 12 side, whereby the thick lining film 14 formed in the first step is formed.
Set the lining film 15 on the inner surface of the pipe line 1 while smoothing the
To form. During the construction of the first step, the liquid resin 6 does not enter the step portion 2a on the rear side in the traveling direction of the step portions 2a and 2b formed by the connecting member 2 interposed in the middle of the pipe line 1 and the application dead angle is Even if it occurs, this application blind spot is applied such that the resin 6 enters the step portion 2a during the step of smoothing the resin 6 in the second step.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline lining method, and more particularly, to a lining method which is suitable for a pipeline having a step in the 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 method for lining the inner surface of a pipe, there is a method of inserting a liquid resin and a pig into the pipe and running the pig by fluid pressure from the rear to form a lining film on the inner surface of the pipe. Are known. In one of the conventional examples, for example, as shown in FIG. 4 (A), the resin d is interposed between the front pig b and the rear pig c from the starting end of the pipe a, and the resin d is inserted into the pipe a, Front pig b and rear pig c due to fluid pressure
By running, the lining film e thinner than the sagging limit film thickness is formed in the conduit a. Then, as shown in FIG. 4 (B), a pig f is inserted from the starting end of the conduit a for finishing the surface of the lining film e, and the pig f is made to run,
Voids, pinholes, etc. on the film surface are removed (described in JP-A-60-172383).

As another conventional example, as shown in FIG. 5, a small-diameter pig b smaller than the leveling pig is arranged in front of the leveling pig c, and the two are connected by a wire g or the like to form a double line. A pig is formed, and the double pig is inserted from the starting end of the conduit a so that the small-diameter pig is at the top together with the resin d. And 2
By running a continuous pig, a small-diameter pig b at the front forms a relatively thick lining film, and a rearing pig c at the back removes voids and pinholes on the film surface and finishes the film surface smoothly. Are known.

[0004]

By the way, the above-mentioned pipeline is laid by connecting a plurality of pipes with a connecting member such as a socket or an elbow. The inner diameter of the connecting member such as the socket and the elbow is usually about 20% larger than the inner diameter of the pipe, and as shown in FIG. 6, a step portion is inevitably generated at the connecting portion with the pipe. When such a pipeline is lined by the above-described conventional construction method, the lining direction is one direction, so even if the resin enters the step portion on the front side in the traveling direction and the resin can be applied, The step portion on the rear side in the traveling direction becomes a blind spot, and there is a problem that the step portion of the blind spot is left unpainted.

The present invention has been proposed in order to solve these problems, and smoothes the inside of a pipe line including a step portion generated by the connection of a connecting member such as a socket or an elbow without leaving an unpainted portion. It is an object of the present invention to provide a method for lining a conduit for forming a simple lining film.

[0006]

In order to achieve the above object, the present invention is provided with a first opening portion on one side of a laid pipeline and a second opening portion on the other side, and the liquid resin is provided from one opening portion. And a pig are introduced to cause a pressure difference between the first opening and the second opening in the pipeline, and the pig is moved by the pressure difference to form a lining film having a set thickness on the inner surface of the pipeline. In the inner surface lining method for forming a pipeline, 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 provided in the pipeline with the first opening being the starting end side. A small amount of the liquid resin that is larger than the amount necessary to form the lining film, and a small-diameter pig that is smaller than the diameter that is necessary to form the lining film having the set thickness,
The lining film having a thickness larger than the set thickness is formed in the pipe by moving the pipe from the opening to the second opening, and in the second step, the second opening is used as the starting end side. When introducing a second pig having a predetermined diameter corresponding to the formation of the lining film having the set thickness into the passage and moving the second pig into the passage leading to the first opening, the first step In the pipe, the thick resin adhered to the inner surface of the pipe is smoothed evenly, and even if the inner step portion of the pipe is formed by the connecting member interposed in the middle of the pipe, there is no application blind spot on the front side or the rear side in the traveling direction. It is characterized in that construction is performed so as to form a lining film having a set thickness on the inner surface of the road.

[0007]

According to the above-mentioned inner surface lining method, when a connecting member such as a pipe joint is present in the middle of the construction pipeline and a step portion is provided in the pipeline, the connection is made during the construction of the first step. Even when the resin does not enter the inner step portion of the pipe on the rear side in the traveling direction when the pig passes through the member and the application blind spot occurs, the application blind spot is generated during the resin leveling process in the second step. Since the resin is applied so as to enter the inner step of the pipe, it is possible to perform the lining construction without leaving the uncoated resin in the pipe. Further, since the thick lining film formed in the first step is smoothed in the second step, the introduction of the resin into the tube is only required at the start of the first step, and at the start of the second step, The work of newly introducing resin into the pipe is unnecessary.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 constructing 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 a means for connecting the pipe 11 and the connecting member 2, the inner diameter of the connecting member 2 is formed to be about 20% larger than the inner diameter of the pipe 11, and a male screw is formed on the outer peripheral end of the pipe 11. , The socket 2
1, since the female screw is formed at the end of the inner peripheral surface of the connecting member 2 such as the elbow 22, the pipe 11 and the connecting member 2 are connected by screwing the male screw and the female screw. Path 1 is formed. Here, the inner diameter of the pipe 11 and the socket 2
Since the inner diameters of the connecting members 2 such as 1 and the elbow 22 are different, as shown in the figure, the connecting portions inevitably have stepped portions 2a, 2
b occurs. In addition, the first opening 12 is provided on one side of the pipeline 1.
However, a second opening 13 is opened on the other side, and a flow rate / pressure regulator 3, a flow rate / pressure gauge 4, and a pump 5 are connected to the opening at the time of lining construction, respectively. A pressure difference is generated between the first opening portion 12 side and the second opening portion 13 side in the pipe line 1 with the pinch in between.

The inner surface lining method of the present invention, which is a process for forming a smooth set lining film having a thickness W over the entire inner surface of the conduit 1 including the step portions 2a and 2b, is used in the process. Is divided into a first step and a second step. First, in a first step, in order to form a lining film having a thickness W1 larger than a set lining film thickness on the inner surface of the conduit 1, the first opening 12 is set as a starting end side and the second opening is formed from the first opening 12. A forward process lining is installed in the pipeline 1 extending to 13. As the method, first, the pipe line 1 is inserted from the first opening 12.
A liquid resin 6 such as epoxy is introduced into the inside of the pipe 1, and then a small-diameter pig 7 which increases the clearance with the inner surface of the pipe 1.
To introduce. Here, the amount of the liquid resin 6 is, for example, the minimum amount of the resin W (RW) πL when the set lining film having the thickness W is formed in the conduit 1 having the total length L and the inner diameter R. become. In the first step, in order to form a lining film having a thickness W1 thicker than the set lining film having a thickness W, W1 (R
-W1) A liquid resin 6 in an amount larger than πL is introduced into the conduit 1. Further, the small-diameter pig 7 has a spherical shape and a thickness W
In order to form the lining film of No. 1, its outer diameter is (R-2
W1).

When the introduction of the liquid resin 6 and the small-diameter pig 7 is completed, the first opening 12 side is pressurized by the pump 5, and the second opening 13 side is depressurized by the pump 5, so that A required pressure difference is generated between the first opening portion 12 side and the second opening portion 13 side 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
The lining film 14 having a thickness W1 is formed on the inner surface of the conduit 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 connecting member 2 such as the socket 21 and the elbow 22 in the pipe line 1, the step portions 2a and 2b are formed.
Even if the liquid resin 6 can be applied to the step portion 2b on the front side in the traveling direction and the resin 6 can be applied, as shown in FIG. The step portion 2a on the rear side in the traveling direction of the liquid resin 6 becomes a blind spot for application, and as shown in FIG. 2 (B), an uncoated portion may be left on the step portion 2a. This second unpainted portion will be described next.
A lining film is formed so as to fill in the process.

In the second step, in order to form the set lining film 15 having the thickness W over the entire inner surface of the conduit 1 while uniformly pressing the lining film 14 having the thickness W1 formed in the first step, The second opening 13 side is used as a starting end side
A post-process lining is applied in the pipe line 1 extending from the opening 13 to the first opening 12. As the method, the second opening 1
The second pig 8 having the outer diameter (R-2W) corresponding to the formation of the setting lining film 15 is introduced into the conduit 1 from the position 3. Then, the second opening 13 side is pressurized by the pump 5,
Further, the pressure on the first opening 12 side is reduced by the pump 5, and the second pig 8 is sandwiched in the conduit 1 to sandwich the first opening 12 side and the second opening 1 side.
A pressure difference is generated between the three sides. Then, as shown in FIG. 3, the second pig 8 moves from the second opening 13 side in the direction opposite to the first step to the first opening 12 side due to the pressure difference. At that time, as shown in FIG. 3 (A), the second pig 8 moves while pressing and leveling the lining film 14 having the thickness W1 formed in the forward process lining of the first process, and the second pig 8 is thickened on the inner surface of the conduit 1. A set lining film 15 having a thickness W is formed. Then, when the lining film is formed on the inner surface of the connecting member 2, as shown in FIG. 3B, the stepped portion 2a that has become the coating dead angle in the first step is on the front side in the traveling direction in the second step. The liquid resin 6 to be smoothed enters the step portion 2a, and as a result, the smooth setting lining film 15 is formed on the entire inner surface of the conduit 1 including the step portions 2a and 2b.

As described above, in this embodiment, the liquid resin 6 and the small-diameter pig 7 are moved from the first opening 12 side to the second opening 13 side in the first step, so that they are set on the inner surface of the pipe line 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 smoothed and the pipeline is formed. A setting lining film 15 is formed on the inner surface of 1. Then, during the construction of the first step, the step portion 2a on the rear side in the traveling direction of the step portions 2a and 2b by the connecting member 2 interposed in the middle of the pipeline 1.
On the other hand, even if the liquid resin 6 does not enter and the application blind spot occurs, the application blind spot is applied so that the resin 6 enters the step portion 2a during the step of smoothing the resin 6 in the second step. Lining can be performed without leaving unpainted resin on the inner surface of the pipeline 1.

In this embodiment, the first opening 12 and the second opening 12
The description has been made by connecting the flow rate / pressure regulator 3, the flow rate / pressure gauge 4, and the pump to the opening 13, respectively, to cause a differential pressure in the conduit 1 to move the pig, but the present invention is not limited to this. Alternatively, the flow rate / pressure regulator 3, the flow rate / pressure gauge 4, and the pump may be connected to the opening at either end and the other end may be opened to the atmosphere to generate a differential pressure in the conduit 1. In this case, simplification of the device can be expected.

[0014]

As described above, according to the present invention, during the construction of the first step, even if the application blind spot occurs without the resin entering the inner step portion of the pipeline on the rear side in the traveling direction, Since the resin is applied so as to enter the application blind spot during the resin leveling step in the second step, the lining can be performed without leaving the resin unpainted in the pipeline. As a result, it becomes possible to form a smooth lining film over the entire inner surface of the pipeline where the lining is applied, without leaving unpainted portions. Also, since the thick lining film formed in the first step is leveled in the second step, it is not necessary to introduce a new resin into the pipe at the start of the second step, and the lining work can be performed. Workability will be improved.

[Brief description of drawings]

FIG. 1 Schematic diagram of pipeline

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

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

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

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

FIG. 6 is an explanatory diagram of a problem

[Explanation of symbols]

 1 Pipeline 11 Pipe 12 1st opening 13 2nd opening 14 Thick lining film 15 Setting lining film 2 Connection member 2a Step part 2b Step part 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 Pipeline length R Pipeline inner diameter

Claims (1)

[Claims] 1. A laid pipeline having a first opening in one side and a second opening in the other side, liquid resin and pig are introduced from one opening, and the first opening and the first opening in the pipeline are provided. In the inner lining method of the pipeline, a lining film having a set thickness is formed on the inner surface of the pipeline by generating a pressure difference between the two openings and moving the pig by the pressure difference. The process is divided into a process and a second process. In the first process, the first opening is used as the starting end side in the pipe line,
Introducing a larger amount of liquid resin than the amount required to form the lining film having the set thickness, and a small-diameter pig having a diameter smaller than the diameter required to form the lining film having the set thickness,
By moving the small-diameter pig into the pipe from the first opening to the second opening, the lining film having a thickness larger than the set thickness is formed in the pipe, and the second opening is used in the second step. When a second pig having a predetermined diameter corresponding to forming the lining film having the set thickness is introduced into the conduit with the portion as the starting end side and the second pig is moved into the conduit reaching the first opening. In addition, the thick adhered resin applied on the inner surface of the pipe applied in the first step is advanced while being evened out, and is also forward and rearward in the advancing direction with respect to the inner step part of the pipe by the connecting member interposed in the middle of the pipe path. An inner surface lining method for a pipeline, which is characterized in that a lining film having a set thickness is formed on the inner surface of the pipeline without causing coating blind spots.