JPH0412195B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an inner lining device for pipes of different diameters.

BACKGROUND TECHNOLOGY Conventionally, as a pipe lining device, as a pig moves inside the pipe, the coating material filled in the pipe is pushed and applied to the pipe inner surface to a predetermined thickness.
A pig-based inner lining device has been proposed.

Problems to be Solved by the Invention However, in the case of an inner lining device that uses pigs, it is difficult to
When applied to pipes with different diameters, where the diameters are different on the gas main side and the indoor outlet side, the pig will become clogged in the small diameter part of the pipe, making it impossible to install. This problem can be solved to some extent by using, for example, a hollow balloon-shaped pig and taking advantage of its deformability, but 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 the inner lining of a pipe line 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,
The pig is equipped with a pig that is moved by fluid pressure within the pipe in order to line the inner surface of the pipe with a coating material to a predetermined thickness, and a rope to pull back the pig. It is composed of a plurality of pig elements with diameters corresponding to the bore diameter, and these pig elements are connected in series in series order, and the most advanced and smallest diameter pig element has no through hole and is connected to the tip of the pullback rope. The pig elements that follow this have a through hole in the center, and are loosely inserted into the pull-back rope in this through hole, and when the pig elements are connected in series, the end openings of each of the through holes are inserted. relates to an inner surface lining device for a pipe of different diameters, characterized in that the device is substantially closed by a pig element connected to the front side thereof.

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

In the figure, a is a pipe with a different diameter, and the pipe with a different diameter is a plurality of pipes, for example, three pipes with different diameters, a _{1 ,} a ₂ , and a ₃ whose diameter decreases stepwise from the starting end to the terminal end. Contains.

The device of the present invention, which is applied to the inner lining of the pipe a of different diameters, includes a pig 1 that is hydraulically moved within the pipe a, and a rope 2 for pulling back the pig 1.

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 diameter of each of the different diameter pipe sections a1 to a3 of the different diameter pipe line a. 13 are connected in series in order of diameter. Normal pig element 11-13
has 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 most advanced pig element 13 with the smallest diameter has no through hole and is fixed to the tip of the pullback rope 2, and the following pig elements 12 and 11 are arranged in the axial direction around the center. It has through holes 121 and 111 that are open, and the pullback rope 2 is loosely inserted into these through holes 121 and 111. When the pig elements 11 to 13 are connected in series, the rear portions of the pig elements 13 and 12 located on the front side fit into the tip openings of the respective through holes 121 and 111, thereby substantially blocking them. are doing.

When applying inner lining to pipes of different diameters using the apparatus of the present invention, the coating material b is filled in the pipe as usual, and then the pig 1 of the apparatus of the present invention is installed inside the pipe, and the pipe is lined with The pig 1 is moved within the conduit by an internal supply of pressurized fluid.

Figure 1 shows the large-diameter pipe a ₁ at the starting end of pipe a of different diameters.
The through hole 111 of the pig element 11 with the largest diameter is provided with an inner lining for the pig elements 12 and 1 connected in series.
Closed by cooperation of 3. So this first
When tension is applied to the pullback rope 2 in the state shown in the figure, and pressurized fluid is supplied into the pipeline as usual while applying a brake to the pig 1, the pig 1 maintains the series connection state shown in Fig. 1. It moves within the pipe a ₁ and forms a coating film c ₁ on its inner surface.

When the pig 1 reaches the end of the starting end pipe a ₁ with different diameters, the pig element 11 with the largest diameter gets stuck at the mouth end of the intermediate pipe pipe a ₂ with different diameters and remains there, so that the pig element 11 with the largest diameter remains there. Only the final pig element 13 following this enters the intermediate different diameter pipe a ₂ and is moved within the intermediate different diameter pipe a ₂ by the pressurized fluid flowing in through the through hole 111 of the first pig element 11. Ru. This movement forms a coating film c ₂ on the inner surface of the conduit a ₂ .

Similarly, as shown in _FIG .
1, 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 a, stop the supply of pressurized fluid and pull back the rope 2 to collect all the pig elements from inside the pipe and prepare for the next operation. I can do it. During this pig element recovery operation, coating films c ₃ and c ₂
Since the surface of c ₁ is re-modified by the pig element that passes through during recovery, a coating film with good surface precision can be obtained.

Effects As described above, with the device of the present invention, pipes with different diameters can be lined on the inner surface in one step, improving workability, and the inner surface can be lined by applying a corresponding pig element to each pipe with a different diameter. 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 longitudinal sectional view schematically showing an embodiment of the present invention and one construction situation thereof, and FIGS. 2 and 3 are longitudinal sectional views schematically showing the progress of the construction. In the figure, 1 is a pig, 11 to 13 are pig elements, and 2 is a pullback rope.

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 a1 _{, a2, a3} of different diameters whose diameters are gradually reduced from the starting end to the terminal end, and the device includes: The pig 1 is equipped with a pig 1 that is moved by fluid pressure inside the pipe in order to line the inner surface of the pipe with the coating material b to a predetermined thickness, and a rope 2 for pulling back the pig 1, and the pig 1 has a different diameter. A plurality of pig elements 1 each having a diameter corresponding to the diameter of each of the pipe parts a _1, a _{2, and} a ₃ .
1, 12, and 13, these pig elements 11, 12, and 13 are connected in series in the order of their diameters, and the smallest diameter pig element 13 at the tip end has no through hole and is connected to the tip of the pull-back rope 2. The subsequent pig element 11,1 is fixed to this
2 has through holes 111 and 121 in the center, and the pull back rope 2 has through holes 111 and 121 at the center.
is loosely inserted into the through holes 111, 12 when the pig elements 11, 12, 13 are connected in series.
1. An inner surface lining device for pipes of different diameters, characterized in that each tip opening of 1 is substantially closed by a pig element 12, 13 connected to the front side thereof.