JPS5935278B2 - Rehabilitation method for existing piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rehabilitation method for existing water pipes, drainage pipes, gas pipes, etc.

Conventionally, the method for rehabilitating existing pipes of this type involves moving a brush or scraper into a pipe that has been cut to an appropriate length, scraping or knocking off the scale on the inner surface of the pipe, and then pulling a lining device into the pipe. A method of lining the inner surface of a tube by moving the tube is known.

However, with this method, it is necessary to pass brushes, scrapers, and lining equipment into the pipe, so it is difficult to insert these into small-diameter pipes or pipes with many bends that make it difficult to tow them. It is difficult to rehabilitate pipes because it is not possible to remove scale from the inner surface of pipes or to line them.

The present invention solves such problems and can easily and reliably descale even pipes with small diameters and pipes with many bends.
The purpose is to line and rehabilitate pipes.

The basic structure of the present invention is that a vacuum pump is connected to one end of the tube to create a vacuum inside the tube, and the suction force is used to suck the scale removal material from the other end of the tube and pass it through the tube to remove scale on the inner surface of the tube. After that, the paint is removed using the suction force of a vacuum pump to form a paint film on the inner surface of the tube.

Embodiments of the present invention will be described below based on the drawings. first,
Scale b inside pipe A is removed to clean the inner surface of pipe A.
One end a of the cut pipe A' is connected to the vacuum pump 1 via the cyclone 3 and the vacuum chamber 2, and the other end a' is connected to a scale removing material. 4
Contact the tank 5 containing the. The outlet of the cyclone 3 is connected to the inlet side of the vacuum chamber 2 via a socket 6, and a filter 7 is interposed between the cyclone 3 and the vacuum chamber 2 as necessary.

Further, the inlet of the cyclone 3 is connected to a transparent hose 9 via a socket 8, and this transparent hose 9 is connected to a pipe X via a seat 10 provided at its tip.

In addition to the cyclone 3, the transparent hose 9 is also used in the cleaning liquid tank 11, dehydration tank 12, paint tank 13,
We are in contact via 15 and 16.

Then, the cleaning liquid receiving tank 11, the dehydration tank 12, the paint receiving tank 1
Similarly to the cyclone 3, the cyclone 3 is also connected to the vacuum chamber 2 via the sockets 17, 18, and 19. On the other hand, the tank 5 containing the scale removal material 4, that is, the scale removal material storage tank 5, has a supply port equipped with a pot 20 at the bottom, and the supply port is equipped with an air suction port 22 that is opened and closed by the pot 21. A hose 24 is connected through the joint pipe 23, and this hose 24
is connected to the tube X via a base 26 equipped with an air valve 25.

As the scale removing material 4, sand or a chemical solution such as hydrochloric acid or phosphoric acid is used. When a chemical solution is used as the scale removing material 4, the cap of the hose 24 connected to the scale removing material storage tank 5 is used. 26 is formed into a nozzle shape.

In the figure, 27 is an air bleed valve, and 28 is a drain valve. When the scale removing material 4 is sand, the vacuum pump 1 is first activated, and the vacuum pump 6 interposed between the cyclone 3 and the vacuum tank 2 and the vacuum pump interposed between the cyclone 3 and the transparent hose 9 are removed. 8 to create a vacuum inside the pipe A'' by the suction force of the vacuum pump 1, and then open the supply port 20 of the scale removal material storage tank 5, the air suction port 21 of the air suction port 22, and the air valve 25. Open appropriately.

Then, the scale removal material 4, that is, sand, in the scale removal material storage tank 5 is sucked and passes through the pipe A''.At this time, the sand 4 slides along the inner peripheral surface of the pipe A''. As the pipe runs, the scale b adhering to the inner peripheral surface of the pipe A'' is scraped off by the sand 4 and completely removed.

The scale b peeled off from the inner peripheral surface of the tube N exits the tube A'' together with the sand 4 and is sucked into the vacuum pump 1 side, but along the way it is taken out by the cyclone 3 and put into the scale separator 29, where it is It is separated from sand 4.

After the scale b was completely removed from the inside of the pipe A'', the operation of the vacuum pump 1 was stopped, and all the open pumps 6, 8,
20, 21 and the air valve 25 are closed.
At this time, if the supply port 20 of the scale removal material storage tank 5 is closed first, the sand 4 and
No scale b remains.

In addition, when the scale removing material 4 is a chemical solution, the containers 6 and 8 of the cyclone 3 are kept closed and the vacuum pump 1 is operated, and the scale remover 4 is interposed between the cleaning liquid receiving tank 11 and the vacuum tank 2. The pot 27 and the pot 14 interposed between the cleaning liquid receiving tank 11 and the transparent hose 9 are opened.

Therefore, the chemical solution 4 is sucked into the tube X as in the case of sand described above.
Run along the inner circumferential surface, wash the inner surface of the pipe A'', and wash away scale b.

The chemical liquid 4 that has passed through the pipe A'' is stored in the cleaning liquid receiving tank 11.

In addition, when using a chemical solution as the scale removing material 4,
After removing the scale b, it is necessary to wash the inner surface of the tube A'' with water to wash away the chemical solution 4 remaining on the inner surface of the tube N, and then dry the inner surface of the tube A''.

That is, as shown in Fig. 4, the connection between the pipe A'' and the scale removal material storage tank 5 is removed, and instead the pipe A'' is connected to a suitable water supply device (not shown) and the cleaning liquid receiving tank is connected. 1
Close the pots 14 and 17 of 1 and install the dehydration tank 12 instead.
The container 18 interposed and closed between the vacuum tank 2 and the container 15 interposed between the dehydration tank 12 and the transparent hose 9 are opened, and water is passed into the pipe A'' to wash away the chemical solution 4.

Thereafter, as shown in Fig. 5, the connection between pipe A and the water supply device is removed, a blind cover 30 is placed on the opening of pipe N, and the vacuum pump 1 is operated to remove the inner peripheral surface of pipe A''. Remove moisture c by suction.

For the pipe N whose inner surface has been cleaned in this manner, the inner surface of the pipe A'' is subsequently lined.

Next, this lining work will be explained. When the scale removing material 4 is sand, a paint tank 31 is connected to the scale removing material storage container 5, and when the scale removing material 4 is a chemical solution, the paint tank 31 is connected to the pipe A'' instead of the blind lid 30.Paint tank Reference numeral 31 consists of a tank 31a for storing the main paint liquid 32 and a tank 31b for storing the hardening liquid 33, and each tank 31a, 31b is connected to supply hoses 36, 37 via the sockets 34, 35, respectively. The two supply hoses 36, 37 are connected to one mixing hose 38.

The mixing hose 38 is internally equipped with a mixing element 39 for stirring and mixing the main liquid 32 and hardening liquid 33 that are supplied separately through two supply hoses 36 and 37, and is provided with an air valve 40 at the end of the pipe. Nozzle 42 via joint pipe 41
Connect. The nozzle 42 has approximately the same structure as the mouthpiece 26 used when sucking the chemical liquid and washing with water when the scale removing material 4 is a chemical liquid in the previous step, and has a flange 43 on the circumferential surface, and the part beyond the flange 43 is connected to the pipe A. '', and a groove-shaped paint reservoir 44 is formed in the circumferential direction of the portion beyond the flange 43, and small holes 45 are formed at appropriate intervals at the bottom of the paint reservoir 44. It will be established.

Then, this nozzle 42 is fixed to the tube A'' with the flange 43 in contact with the open end of the tube A'' via the packing 46, and the part beyond the flange 43 inserted into the tube A''. In this state, the vacuum pump 1 is operated again and the tank 1 interposed between the paint receiving tank 13 and the vacuum tank 2 is removed.
9, the tank 16 interposed between the paint receiving tank 13 and the transparent hose 9 is opened, the inside of the pipe N is evacuated, and then the tank 31 is opened.
Open the cocks 34, 35 of a and 31b and the air valve 40 appropriately to suck the paint main liquid 32 and hardening liquid 33.

The main paint liquid 32 and the hardening liquid 33 are mixed by the mixing hose 38 and ejected from the small hole 45 of the nozzle 42, transmitted through the paint reservoir 44, and distributed almost uniformly from the entire periphery of the nozzle 42 to the pipe A''.
It is sucked into the tube A'' and runs along the inner circumferential surface of the tube A'' as if sliding thereon, forming a coating film d on the inner circumferential surface of the tube A''.

Then, the paint passing through the pipe A'' reaches the transparent hose 9,
When this can be visually observed through the hose 9, the supply of paint is stopped, and at the same time, the operation of the vacuum pump 1 is stopped to complete the lining.

If more paint than necessary is suctioned during this lining process, the excess paint will accumulate in the paint receiving tank 13.

The above-described scale removal process and lining process are sequentially performed on each cut pipe A'' of the pipe A, and then the cut pipe A'' is reconnected to complete the rehabilitation work.

The above explanation is based on the fact that the paint that forms the coating film d on the inner surface of the pipe N is composed of two liquids: the main paint liquid 32 and the curing liquid 33.
Although we have described the case of using a so-called two-component paint that hardens by mixing liquids, it is of course possible to use a one-component paint, and in this case, only one tank is required, and the mixing hose 38 Needless to say, this is also unnecessary.

Further, in the scale removal step, it is also possible to use sand and a chemical solution in combination as the scale removal material 4, and to use a mixture of these.

Since the present invention has the above configuration, it has the following advantages.

(1) There is no need to drag brushes and scrapers for scale removal, lining equipment for coating film formation, etc. inside the pipe, so it is possible to use small-diameter pipes or pipes where these instruments cannot be inserted. , scale removal and lining can be easily and reliably performed on pipes with many curved elbows and difficult to tow and move with the above-mentioned equipment. It is extremely effective for the rehabilitation of people such as

(2) All operations such as scale removal, cleaning, drying, and lining are performed using the suction power of a vacuum, so equipment can be shared in each process and the work can be performed as a continuous process, improving work efficiency. Good performance, reduced work time,
It is possible to reduce costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the existing piping rehabilitation method of the present invention, and FIG. 1 is a schematic diagram of an apparatus used to carry out the method of the present invention, partially cut away.

Claims (1)

[Claims] 1. Cut the existing piping to an appropriate length, connect one end of the cut pipe to a tank containing a scale removing material, connect the other end to a vacuum pump, and operate the vacuum pump. The process of removing the scale adhering to the inner wall surface of the pipe by creating a vacuum inside the pipe and using its suction force to pass the scale removal material into the pipe, removing the tank containing the scale removal material from one end of the pipe and replacing it with The process involves connecting a tank containing paint to the end of the tube, and then operating the vacuum pump again to suck paint from the paint tank and run it along the inner surface of the tube to form a coating film on the inner surface of the tube. A method for rehabilitating existing piping. 2. The method for rehabilitating existing piping according to claim 1, wherein the scale removing material is sand. 3. The method for rehabilitating existing piping according to claim 1, wherein the scale removing material is a chemical solution such as hydrochloric acid or phosphoric acid. 4. The method for rehabilitating existing piping according to claim 1, wherein the scale removing material is a mixture of sand and a chemical solution such as hydrochloric acid or phosphoric acid. 5. The method for renovating existing piping as set forth in claim 1, wherein the paint is a two-component paint that is composed of two liquids, a main liquid and a curing liquid, and is cured by mixing these two liquids. .