JPH0626380Y2 - Pigment for lining the wall surface in the pipeline - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a lining pig for an inner wall surface of a pipe, and is used rehabilitated for a buried gas pipe, a water pipe and the like.

(Prior art) When placed on the lining of the inner wall surface of the pipe by the so-called liquid phase method,
Usually, as shown in FIG.
Is filled in a layered manner, and a spherical pig 8 made of a hard elastic material is inserted in the rear (or in the rear and in the front) and the lining material 6 is caused to flow forward by the compressed gas 7 or the like, thereby lining the inner wall surface of the pipe line. The coating film 6a is formed.

Further, if the pipe 5 to be processed has a branch pipe 5a, the pig 9
As shown in FIG. 7, a connecting pig 9 is used as a branch pipe, and even if the forward pig 9a enters the straight pipe 5b due to its motional inertia at the branch A, the rear pig 9b is branched. The pig 9 is switch-turned by pushing it into the passage 5a and automatically advances it into the branch pipe passage 5a (JP-A-57-167777, etc.).

Even if the front pig 9a enters the straight pipe line 5b, the connection type pig 9 is relatively smoothly pulled back into the branch pipe line 5a by performing a switch turn, so that the clogging accident of the pig 9 does not occur. It has an excellent effect of being significantly reduced.

However, even in the connection type pig 9, there still remain many problems to be solved.

First, since it takes a considerable amount of time to switch the pig 9, there is a problem that the lining material 6 accumulates in the branch portion A or the coating 6a of the branch portion A has large unevenness. .

That is, at the branch portion A of the processed pipe 5, the main pipe 5c
Even when the straight pipe 5b and the branch pipe 5a have the same diameter, the opening of the branch pipe 5a is normally larger than the inner diameter of the straight pipe 5b as shown in FIG. Therefore, the compressed gas 7 leaks into the branch conduit 5a through the gap G between the rear pig 9b that makes the switch turn and the inner wall of the pipe, and the pushing force of the rear pig 9b decreases. As a result, the rearward progress of the pig 9b is at the branch portion A.
At that time, it temporarily stagnates, and a so-called "stray of a pig" occurs without a quick switch turn. Then, the lining material 6 extruded into the branch conduit 5a flows backward during the stray of the pig and collects at the bottom of the branch portion A, or the lining material 6 flows into the inner part of the straight conduit 5b. It will be.

The second problem is that it is impossible to completely prevent clogging of the pig 9 at the branch portion A.

That is, when the straight conduit 5b ahead of the branch A is considerably long or when the main conduit 5c on the front side of the branch A is long, the kinetic energy of the space inside the straight conduit 5b and the pig 9 is increased. Since it becomes large, the front pig 9a enters into the straight conduit 5b considerably deeply.

Then, the rear pig 9b is also relatively pushed forward, and as a result, the gap G between the pig 9b and the inner wall surface of the pipe line increases, and the force for pushing the rear pig 9b into the branch pipe line 5a is weakened, which is often the case. This will result in clogging of the pig 9.

(Problems to be Solved by the Invention) The present invention has the above-mentioned problem in the lining of the inner wall surface of the pipeline using the conventional coupling pig 9, that is, the coupling pig at the branch portion A of the pipeline. It takes time to switch the switch 9 and the lining material 6 accumulates at the bottom of the branch portion A or flows into the inner part of the straight conduit 5b during that time, and the pig 9 is easily clogged at the branch portion A. This is to solve the problem such as that, the pig can smoothly proceed into the branch pipe line 5a without making a switch turn, and the switch turn is completed very quickly even if a switch turn occurs. However, the present invention provides a pig for lining the inner wall surface of a pipe, which is capable of almost completely preventing pooling of the lining material 6 and clogging of the pig 9.

(Means for Solving the Problems) In the present invention, two core balls 3 and 4 made of a hard material are embedded in the outer layer body 4 made of a soft elastic material at regular intervals L. Is the basic configuration of the device.

(Operation) In the branch portion A, even when the front portion of the pig 1 enters the straight conduit 5b relatively shallowly or relatively deeply, the opening end of the branch conduit 5a is the outer layer body. It is sealed by the outer surface of 4. As a result, the pig 1 is strongly compressed by the compressed gas 7, and when the front portion of the pig 1 is relatively shallow and enters the straight conduit 5b, the front end portion of the outer layer body made of a soft elastic material is elastic. It is deformed and quickly pushed out into the branch conduit 5a, and the pig 1 is in the same posture as in the main conduit 5c.
Enter into a.

Further, when the pig 1 relatively deeply enters the straight conduit 5b, the rear portion of the outer layer body 4 is compressed and deformed to be pushed out into the branch conduit 5a, and so-called switchback is performed. As a result, the pig 1 advances in the branch conduit 5a in a state where the front and rear positions are interchanged.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of a lining pig according to the present invention. The lining pig 1 is a state in which two core balls 2 and 3 are separated from each other by a certain distance L. And an outer layer body 4 made of a soft elastic material surrounding the outer layer body 4. The core balls 3 and 4 are formed in a spherical shape or an elliptical shape using a soft material such as hard plastic, light metal, wood and glass, and the outer diameter D thereof is 20A and is 10 in the pipe line pig 1.
It is selected to be 13 to 18 mmφ with a pig 1 for 25 A pipe and a diameter of 25 A.

The distance L between the cores 2 and 3 is selected to be 20 to 25 mm for the 20A conduit pig and 25 to 30 mm for the 25A conduit pig, respectively.

In this embodiment, two core balls are used and both core balls 2 and 3 have the same outer diameter D. However, as will be described later, the outer diameters D of the two are different. Good.

On the other hand, the outer layer body 4 is formed from a soft elastic material such as soft plastic or soft rubber having elasticity such as urethane foam. In this embodiment, only the outer surface is a smooth surface to block air permeability. The outer layer body 4 is formed using the urethane foam.

The outer layer body 4 is formed in a substantially cylindrical shape in a state of surrounding both core balls 2 and 3 separated by a distance L, and both end portions thereof are formed in a spherical shape.

The outer diameter D ₀ of the outer layer body 4 is 26 to 30 mm for a 20 A pipe line.
φ and 25A pipes are selected to be 30 to 35mmφ, and the longitudinal dimension L ₀ is 40A for 20A pipes.
-50mm, 25A conduit, 50-60mm, respectively.

Next, the lining of the inner wall surface of the pipeline using the pig according to the present invention will be described.

At the time of lining, as shown in FIG. 2, one set (or two sets) of pigs 1 is inserted into the pipe 5 to be treated, and a predetermined amount of the lining material 6 is layered in front of it (or in the middle of both pigs). Fill. At this time, the outer layer body 4 of the pig 1 is compressed and reduced in diameter, and is inserted into the pipe in a state of being in close contact with the inner wall surface of the pipe.

Next, the compressed gas 7 is supplied from the rear of the pig 1, and the pig 1 is pressed forward to cause the lining material 6 to flow forward to form the film 6a on the inner wall surface of the conduit.

By supplying the compressed gas 7, the pig 1 receives resistance due to the frictional resistance with the inner wall surface of the conduit and the flow resistance of the lining material 6, and is pressed by the compressed gas 7, whereby the length L ₀ of the outer layer body 4 is reduced. Is slightly shortened, and is deformed in the radial direction to increase the compressive force on the inner wall surface of the pipe. As a result, the lining material 6 attached to the inner wall of the pipe is pressed against the inner wall surface of the pipe and smoothed, and the lining film 6a having a certain thickness is formed on the inner wall surface of the pipe.

When the pig 1 reaches the branched portion A of the pipe 5 to be processed, the tip of the pig 1 slightly enters the straight pipe 5b as shown by ← in FIG. However, due to the relatively long outer layer 4, the branch pipe 5
Since the opening of “a” is completely closed and there is no leakage of the compressed gas 7, the outer layer body 4 is strongly pressed, and its front end is compressed and deformed to be pushed out into the branch conduit 5a to perform a switch turn. Without any trouble, the vehicle smoothly proceeds into the branch pipeline 5a in the same positional relationship as that in which it is traveling in the main pipeline 5c.

When the main conduit 5c is long and the kinetic energy of the pig 1 is large, or when the straight conduit 5b is long and the space in the pipe is large, the front half of the pig 1 is the straight conduit as shown in FIG. 5
It will be in a state that it penetrates into the inside of b considerably deeply.

However, since the outer layer body 4 is relatively long, the opening of the branch conduit 5a is completely sealed, and the outer layer body 4 is pressed by the compressed gas 7 as much as possible. As a result, the rear portion of the pig main body 1 is compressed and deformed, and is pushed out while curving into the branch pipe line 5a to perform a quick switch turn, and then the branch pipe has an opposite positional relationship to the main pipe line 5c. Road 5
Proceed in a.

FIG. 5 shows a second embodiment of the present invention, in which the outer diameter D of the front core ball 2 is made smaller than the outer diameter D of the rear core ball 3, and the outer diameter of the pig body 4 is also double core. The front portion of the sphere is formed into a reduced diameter according to the sphere.

For example, when the outer diameter of one core ball 3 is 15 mmφ, the outer diameter of the other core ball 2 is 13 mmφ, and when the outer diameter of one core ball 3 is 18 mmφ, the outer diameter of the other core ball 2 is Is 16
The outer diameter of the outer layer body 4 in the vicinity of the core ball 2 is 3 to 4 mm larger than the outer diameter of the outer layer body 4 in the vicinity of the core ball 3 according to the diameter reduction of the core ball. The diameter is reduced.

By making the pig main body 1 in the shape as shown in FIG. 5, the thickness of the lining film 6a formed on the inner wall surface of the conduit becomes relatively thick, and the tip of the pig 1 at the branch portion A becomes easier. Then, it will proceed into the branch conduit 5a.

(Effect of the Invention) In the present invention, the pig 1 is arranged inside the outer layer body 4 made of a soft material having elasticity, and two core balls 2, 3 made of a hard material are arranged at a constant interval L. Since it is provided, the opening of the branch pipe 5a is completely sealed by the pig 1 at the branch A of the pipe. As a result, the pig 1 is strongly pressed by the compressed gas 7, and the tip end thereof is compressed and deformed and pushed out into the branch conduit 5a, so that the pig 1 smoothly advances into the branch conduit 5a without switching back. , Branch A
There will be no lining material buildup in the area.

In addition, even if a switchback is made at the branch portion A, the switchback will be performed very quickly, and the "lost time of the pig" will become long as in the case of the conventional connection type pig, and the lining material will be accumulated. There will be no accidents that will occur or the pigs will become clogged.

Further, in the case of a pig in which the outer diameter D of both the core balls 2 and 3 and the outer diameter D ₀ of the outer layer body in the vicinity of the both core balls 2 and 3 are changed, the reduced diameter is set to the front and the pig 1 is attached. By inserting into the pipe line, the lining film laminated and fixed on the inner wall surface of the pipe line becomes thicker than in the case of the pig 1 using the core ball having the same outer diameter,
Even at the branch portion A, the tip of the pig 1 advances more smoothly into the branch conduit 5a, and clogging is reduced.

The present invention has high practical utility as described above.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pig according to the present invention. FIG. 2 shows an example of the lining of the inner wall surface of the pipe using the pig of the present invention, and FIGS. 3 and 4 are explanatory views of the operating state of the pig at the branch portion A of the pipe. Is. FIG. 5 is a vertical sectional view of a pig according to a second embodiment of the present invention. FIG. 6 and FIG. 7 are explanatory views of the lining of the pipeline by the conventional lining pig. FIG. 8 is an explanatory view of the switch turn of the conventional connection type pig at the branch portion. 1 …… Pig 2, 3 …… Core ball 4 …… Outer layer L …… Distance between cores D …… Radius of core ball D ₀ …… Outer diameter of pig body L ₀ …… Pig body length 5 …… Pipe to be treated 6 ... Lining material 7 ... Compressed gas

Claims (2)

[Scope of utility model registration request] 1. A lining pig for lining an inner wall surface of a pipe, wherein two core balls made of a hard material are embedded in the outer layer body made of a soft elastic material with a fixed interval. 2. The lining of the inner wall surface of the pipe line according to claim 1, wherein the outer diameters of the one core ball and the other core ball and the outer diameter of the outer layer body in the vicinity of both core balls are different from each other. Pig.