JPH0434457B2 - - 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 a tube portion of different diameters.

BACKGROUND TECHNOLOGY Conventionally, as a lining device for the inner surface of a pipe, as the 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.
A lining device using a pig has been proposed.

Problems to be Solved by the Invention However, in a pipe lining device using a pig, the diameters are different between the gas main side and the indoor outlet side, as in 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 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 a device applied to the inner lining of a pipe section of different diameters including a plurality of pipe sections of different diameters whose diameters are reduced in stages, the device In order to line the inner surface of the pipe with a filling coating material to a predetermined thickness, the pipe is equipped with a pig that is moved by fluid pressure from the large diameter side to the small diameter side in the pipe, and the pig is attached to each of the different diameter pipe sections. It is composed of multiple pig elements with diameters corresponding to the bore diameter, and these pig elements are connected in series in order of diameter, and the smallest diameter pig element at the forefront has no through hole, and the following pig elements The pig element has a through hole in the center that opens in the front-rear direction, and when the pig elements are connected in series, the front end opening of each of the through holes is substantially closed by the front side connected pig element, Inside the smallest diameter pig element at the forefront end, a wire rod that can be freely fed out to the rear is wound and stored.
The present invention relates to a lining device for the inner surface of a pipe of different diameters, characterized in that the wire is fed out into the pipe through a through hole of a subsequent pig element as the pig moves within the pipe.

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

FIG. 1 shows details of a pig 1 provided in the apparatus of the present invention.

The pig 1 includes a plurality of pig elements 11, 12, for example, three pig elements 11 and 12, each having a diameter corresponding to the diameter of each of the different diameter pipe parts _a1 to _a3 of the different diameter pipe part a (see FIGS. 3 to 8).
and 13, such pig elements 11
- 13 are connected in series in order of diameter, and have a diameter slightly smaller than the diameter of the corresponding different diameter pipe parts a ₁ - a ₃ .

Among the pig elements 11 to 13, the smallest diameter pig element 11 at the forefront end has no through hole, and the following pig elements 12 and 13 each have a through hole 121 in the center that opens in the axial direction of the pipe a. and 131. When the pig elements 11 to 13 are connected in series, the through hole 1
The rear portions of the pig elements 11 and 12 connected to the front side thereof fit into the front end openings of the pig elements 21 and 131, respectively, and substantially close the openings. Incidentally, the pig elements 11 to 13 normally maintain a serially connected state, but are configured so that the connection can be easily broken when a force in the direction of disconnection is applied to the connected portion.

Inside the pig element 11 with the smallest diameter, there is a reel 2.
A wire rod 3 is wound on the reel 2, and the wire rod 3 can be unwound in the axial direction of the conduit a and can be freely stored. The reel 2 can be equipped with a suitable braking device (not shown).

3 to 8 show the lining of the inner surface of pipes of different diameters using the apparatus of the present invention in the order of steps.

FIG. 3 shows how the coating material b is filled into the pipe line a, and FIG. 4 shows how the pig 1 is installed.

As shown in Figures 3 and 4, a predetermined amount of coating material b necessary for lining and a pig 1 necessary for lining the coating material b are attached to the rear end of large diameter pipe section a ₃ in pipe a. The wire rod 3 (first to second
(see figure) for subsequent pig elements 12 and 13.
The pig 1 is ready to be launched by pulling it out of the pipe through the through holes 121 and 131 and fixing the pull-out part 31 there using appropriate means.

Then, open valve c in the state shown in Figure 4,
When the compressor d is activated and pressurized air is supplied from the rear end of the large diameter pipe section a ₃ to the inside thereof, the pig 1 spreads the coating material b inside the large diameter pipe section a ₃ as shown in Fig. 5. It moves forward while being pushed, and during this forward movement, the rearmost end of the pig 1, the pig element 13 with the largest diameter, forms a coating film _b3 on the inner surface of the large diameter pipe part _a3 .

As shown in FIG. 6, the pig ₁
When reaching the front end of the medium diameter pipe section _a2 , the largest diameter pig element 13 is stuck at the rear end of the medium diameter pipe section a2 and remains there, so that only the medium diameter pig element 12 and the small diameter pig element 11 connected thereto are part of the medium diameter pipe. Enter part a ₂ . Pressurized air flows into this medium diameter pipe part _a2 through the through hole 131 of the largest diameter pig element 13, so the medium and small pig elements 12 and 11 receive the pressure of the pressurized air and The coating material b is pushed forward inside the diameter tube section _a2 , and as the coating material b moves forward, the medium diameter pig element 12 forms a coating film _b2 on the inner surface of the medium diameter tube section _a2 . Similarly, only the small diameter pig element 11 enters the small diameter pipe part a ₁ at the front end, and moves forward inside the small diameter pipe part a 1 under the pressure of pressurized air flowing in through the through hole 121 of the medium diameter pig element ₁₂ . As this forward movement progresses, a coating film b ₁ is formed on the inner surface of the small diameter pipe part a ₁ .
Form and go. This situation is illustrated in Figures 6-7. In this way, the pig 1 passes through the different diameter pipe section a while sequentially cutting off the large diameter and medium diameter pig elements, and as shown in _FIG . At that point, the lining over the entire length of the different diameter pipe a is finished.

During the process of lining the inner surface of the pipe a with different diameters by the pig 1, as shown in FIGS. 4 to 7, the wire 3 is fed out from within the smallest diameter pig element 11 and threaded into the pipe a. This wire 3 is passed through the pipe a
It is necessary to collect the pig elements 11 to 13 from inside.

The purpose of passing the wire into the pipe a can be achieved by forcibly drawing the wire 3 into the pipe a using the pig 1, for example. However, in this method, the movement of the pig 1 within the conduit a is subject to the drawing resistance of the wire rod 3, making it necessary to increase the fluid pressure within the conduit a accordingly. However, if the fluid pressure in the pipe line a becomes too large, the fluid pressure will protrude from the circumference between the pig 1 and the inner surface of the pipe line a, making it impossible to perform lining work. This problem is especially true when the pipeline is long or
This becomes noticeable when the conduit includes many bends.

In the present invention, the wire 3 is the smallest diameter pig element 1
1, and is structured so that it is unwound from the pig as it moves through the pipe, achieving the purpose of wiring without providing resistance to the pig's movement within the pipe. This is especially useful when the pipe is long or contains many bends.

In the present invention, as the inner surface of the pipe a is lined by the pig 1, the wire rod 3 is passed through the pipe a, so that after the lining is completed, as shown in FIG. For example, by winding the wire 3 onto a drum e installed outside the pipe, the pig element 1
1 to 13 can be recovered from the pipe a and prepared for the next operation. This pig element 11-1
During the recovery operation in step 3, the pig elements 11 to 13 pass over the surfaces of the coating films b ₁ to _{b 3} again, so if there are traces of contact with the wire rod 3 left on the coating films b ₁ to b ₃ , Even if the contact marks are removed, the contact marks are corrected by passing the pig elements 11 to 13 again, and a coating film with good surface precision is 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. 1, they may be connected to each other by first and second engaging concave and convex portions 4 and 5. In this case, the engaging uneven portion 4
and 5 are required to be separated in order from the larger diameter side in the pipe a when necessary, and therefore it is preferable that the engagement force is weaker as the larger diameter side approaches, but for example, if there is no difference in strength. Even if this is the case, there is no particular problem because the pressure receiving area increases 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, if the pig elements 11, 12, and 13 have a shape substantially close to a sphere, there is a risk that the pig elements 11, 12, and 13 may change direction while moving in the pipe a. It is preferable that two of each element be arranged in series via an intermediate shaft portion so that the central axis thereof is always parallel to the tube axis.

Effects 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 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.

Furthermore, the structure is such that the wiring required for collecting the pig elements 11 to 13 can be achieved without providing any resistance to the movement of the pigs within the pipe, making it easy to construct pipes with long construction lengths and bends. It has the characteristic that it can be applied without any problem to the construction of inner lining of pipes, which include many pipes.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the device of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG.
The figures are explanatory diagrams showing the state of lining the inner surface of a pipe by the apparatus of the present invention in the order of steps. In the figure, 1 is a pig, 11 to 13 are pig elements, 2 is a reel, and 3 is a wire rod.

Claims (1)

[Claims] 1. Plural pipe parts a ₁ with different diameters whose diameters are gradually reduced,
This device is applied to the inner surface lining of a pipe portion a of different diameters including a ₂ and a ₃ , and this device is used to line the inner surface of the pipe with coating material b filled in the pipe portion a of different diameters to a predetermined thickness. is equipped with a pig 1 that is fluidically moved from the large diameter side to the small diameter side in the pipe, and the pig 1 has a diameter corresponding to the diameter of each of the different diameter pipe parts a ₁ , a ₂ , and a ₃ . A plurality of pig elements 11, 12, 13
consisting of pig elements 11, 12, etc.
13 are connected in series in order of diameter size, and the smallest diameter pig element 11 at the forefront end has no through hole, and the pig elements 1 that follow it
2 and 13 are through holes 121 and 1 that open in the front and back direction.
31, and when the pig elements 11, 12, 13 are connected in series, the through holes 121, 1
The front end opening of each of 31 is substantially closed by the front side connected pig elements 11 and 12,
A wire rod 3 that can be freely fed out rearward is wound and stored inside the smallest diameter pig element 11 at the forefront end, and as this wire rod 3 moves in the pipe, the through holes 121, 131 of the following pig elements 12, 13 are inserted. A lining device for the inner surface of a pipe of different diameters, characterized in that the device is configured to be fed into the pipe through the lining device.