JPH0434456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lining device for the inner surface of pipes of different diameters.

BACKGROUND TECHNOLOGY Conventionally, as a lining device for the inner surface of a pipe, as a pig moves inside the pipe, the coating material filled in the pipe is pushed and applied to the inner surface of the pipe to a predetermined thickness.
Pig-based internal lining devices have been proposed.

Problems to be Solved by the Invention However, in the case of an inner lining device using a pig, it is necessary to make the diameter different between the gas main side and the indoor outlet side, as in the case of indoor city gas piping, for example. If this method is applied to pipes with different diameters, the pig will become clogged in the small diameter part of the pipe, making it impossible to perform the work. This problem can be solved by using, for example, a hollow balloon-shaped pig.
Although this can be solved to some extent by utilizing its deformability, this balloon method causes the problem that it is difficult to control the film thickness.

The present invention has been made with the aim of eliminating such conventional problems.

Means for Solving the Problems The present invention is an apparatus applied to lining the inner surface of a pipe of different diameters including a plurality of pipe parts of different diameters whose diameters are gradually reduced from the starting end to the terminal end. teeth,
A pig that is reciprocated between the starting end and the terminal end of the pipe, and as it reciprocates, it gradually lines the inner surface of the pipe while pushing the coating material filled inside the pipe, and the inside of the pipe from the starting end of the pipe. a pig reciprocating device for supplying pressurized fluid to move the pig back and forth within the conduit, and a pig reciprocating device that applies fluid pressure to the pig to move the pig back and forth within the conduit, The above-mentioned pig is composed of a plurality of pig elements having diameters corresponding to the respective diameters of the above-mentioned different-diameter pipe sections, and the equal pig elements are connected in series in the order of diameter size, and the pig elements are connected in series in order of diameter, and the smallest diameter pig is the most advanced. The element is without a through hole, and the subsequent pig element has a central through hole, and the distal opening of each through hole is configured to be substantially occluded by the distal connecting pig element. The present invention relates to a lining device for the inner surface of a pipe portion of different diameters.

Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.

In the figure, a is a different diameter tube section, and the different diameter tube section a has a plurality of different diameter tube sections a 1 , a 2 , and a, for example, three different diameter tube sections a ₁ , a ₂ , and a whose diameter decreases stepwise from the starting end to the terminal end. Contains ₃ .

The device of the present invention applied to the inner surface lining of the pipe section a of different diameters is reciprocated between the starting end and the terminal end of the pipe a, and the reciprocating motion pushes the coating material b filled inside the pipe while A pig 1 that gradually lines the inner surface of the pipe a, and a pig reciprocating device 2 that supplies pressurized fluid to the inside of the pipe from the starting end side of the pipe a to move the pig 1 forward within the pipe a. , and a pig return movement device 3 that applies fluid pressure to the pig 1 to move the pig 1 back within the conduit a.

As the pig forward movement device 2, for example, a compressor can be used, and as the pig return movement device 3, a vacuum pump that sucks the inside of the pipe a from the starting end side can be used.
Instead of the vacuum pump, a compressor (not shown) that supplies pressurized air from the terminal end of the pipe a may be used.

The pig 1 is composed of a plurality of pig elements _11, 12, and ₁₃ , for example, three pig elements 11, 12, and 13, each having a diameter corresponding to the caliber of each of the different diameter pipe portions a1 to a3, and these pig elements 11 to 13 are arranged in series in order of diameter. connected in a similar manner. Normally, the pig elements 11 to 13 have a diameter slightly smaller than the diameter of the corresponding different diameter tube portions a ₁ to a ₃ .

Among the pig elements 11 to 13, the smallest diameter pig element 13 at the most extreme end has no through hole, and the pig elements 12 and 11 that follow it have no through hole.
have through holes 121 and 111 that open in the axial direction at the center, respectively. When the pig elements 11 to 13 are connected in series, the through hole 1
The rear portions of the pig elements 13 and 12 located on the forward side are fitted into the tip openings of the pig elements 21 and 111, respectively, to substantially close the openings.

When lining the inner surface of a pipe with a different diameter using the apparatus of the present invention, the starting end of the pipe is filled with coating material b in the usual manner, and then the pig 1 of the apparatus of the present invention is applied to the starting end of the pipe. It will be installed in the department. d is a lid that closes the starting end of the pipe.

Figure 1 shows the large diameter different diameter pipe section a ₁ at the starting end of the different diameter pipe section a.
The through hole 111 of the pig element 11 with the largest diameter is
It is closed by the cooperation of pig elements 12 and 13 connected in series thereto. When the valve 21 of the pig reciprocating device 2 is opened in the state shown in FIG. 1 and pressurized fluid, such as pressurized air, is supplied into the pipe, the pigs 1 maintain the series connection state shown in FIG. while pushing the coating material b inside the pipe a ₁ ,
A coating film c ₁ is formed on the inner surface of the pipe.

When the pig 1 reaches the end of the starting end different diameter pipe section _a1 , the largest diameter pig element 11 is stuck at the mouth end of the intermediate different diameter pipe section _a2 , which is one step down, and remains there. Only the final pig element 13 connected to this enters the intermediate different diameter pipe part _a2 , and the pressurized fluid flowing through the through hole 111 of the final pig element 11 coats the inside of the intermediate different diameter pipe part _a2 with the coating material b. It moves forward while pushing. Due to this forward movement, a coating film _c2 is formed on the inner surface of the conduit _a2 .

Similarly, as shown in _FIG .
It is moved forward by the pressurizing body flowing through 21, and a coating film _c3 is formed on the inner surface of the conduit _a3 .

After finishing the inner lining of the entire length of the different diameter pipe section a, the valve 21 of the pig forward movement device 2 is closed, while the valve 31 of the pig return movement device 3 is opened to suck the inside of the pipe line a, and the pig element 11 , 12 and 13
moves back through the pipe in order from the terminal end, and as shown in Figure 4, it finally returns to its initial appearance, moves back through the pipe, and is collected from the starting end of pipe a. Ready for next operation. During this pig element collection operation, the surfaces of coating films c ₃ , c ₂ and c ₁ are re-modified by the pig elements passing through during collection, so
A coating film with good surface precision can be obtained.

In the present invention, the pig elements 11 to 13 move while pushing the coating material b in the pipe a, so they move together without being particularly connected to each other, but it is more stable and reliable. In order to obtain such integral mobility, for example, as shown in FIG. 5, FIG. 6, and FIG. good. In this case, the engaging uneven parts 4 and 5 need to be separated in order from the larger diameter side when necessary in the pipe a, and therefore it is preferable that the engagement force is weaker as the larger diameter side increases. For example, even if there is no difference in strength, there is no particular problem because the pressure receiving area becomes larger as the diameter increases. The magnitude of the engagement force of the engagement uneven portions 4 and 5 is determined by appropriately selecting the engagement depth and/or the engagement length.

In addition, as shown in FIG.
1, 12, and 13 have a shape substantially close to a sphere, there is a risk that the directions may change during movement within the pipe a. As shown in the figure, it is preferable to arrange two of each element in series so that the center axis thereof always maintains a parallel relationship with the tube axis.

Effects As described above, with the device of the present invention, pipe sections with different diameters can be lined on the inner surface in one step, improving workability, and the inner surface can be lined by applying the corresponding pig element to each pipe section with different diameters. Therefore, the thickness of the coating film can be easily controlled, and a high-quality, high-performance inner lining can be formed efficiently.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view schematically showing an embodiment of the present invention and its construction status, Figs. 2 and 3 are longitudinal sectional views schematically showing the progress of the construction, and Fig. 4 is a pig 5th longitudinal sectional view schematically showing the recovery situation of
6 and 7 are longitudinal sectional views showing various examples of structural changes of the pig. In the figure, 1 is a pig, 11 to 13 are pig elements, 2 is a pig forward movement device, 3 is a pig return movement device, and 4 and 5 are engaging uneven portions.

Claims (1)

[Claims] 1. A device applied to the inner lining of a pipe line a of different diameters including a plurality of pipe parts a ₁ , a ₂ , a ₃ of different diameters whose diameters are gradually reduced from the starting end to the terminal end, and the device includes: The pig 1 is reciprocated between the starting end and the terminal end of the pipe a, and when moving forward, it gradually lines the inner surface of the pipe a while pushing the coating material b filled in the pipe a; A pig moving device 2 that supplies pressurized fluid from the starting end side of the pipe line a to the inside thereof to move the pig 1 forward within the pipe line a; The pig 1 includes a plurality of pigs having diameters corresponding to the respective diameters of the different diameter pipe portions a ₁ , a ₂ , and a ₃ . Composed of elements 11, 12, 13, these pig elements 11, 12, 13
are connected in series in order of diameter, and the smallest diameter pig element 13 at the tip has no through hole, and the following pig elements 11 and 12 have through holes 111 and 121 in the center. , through hole 1
Each of the distal end openings of the pig elements 11, 12, and 121 is provided with a different diameter tube portion, which is substantially closed by the pig elements 12 and 13 connected to the distal end thereof when the pig elements 11, 12, and 13 are connected in series. Inner lining device.