JPH046433B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is useful for cleaning the inner surfaces of pipelines buried underground, such as gas pipes, water pipes, sewer pipes, power lines, communication lines, etc. It concerns a method for doing so.

In order to repair or reinforce these pipelines,
A cylindrical lining material is attached to the inner surface of the pipe to line the pipe. Therefore, when lining these pipes, it is necessary to clean the inner surface of the pipe to remove foreign substances such as oil, rust, and scale, and to clean the inner surface of the pipe before pasting the lining material. is necessary. In addition to lining pipes, rust, scale, and the like are removed from the inner surface of pipes that have been used for a long period of time to improve the efficiency of air and water supply.

BACKGROUND TECHNOLOGY Conventionally, various methods have been used to clean these pipes, one of which is to pass a water jet nozzle through the pipe and direct a high-pressure jet water stream from the water jet nozzle into the pipe. The water is sprayed onto the inner surface of the pipe, and the foreign matter on the inner surface of the pipe is peeled off and removed by the water flow.

FIG. 4 shows this method, in which pipe line 1
A guide wheel 2 is disposed inside, and a water injection nozzle 3 is disposed in front of the guide wheel 2, so that the guide wheel 2 positions the water injection nozzle 3 substantially on the central axis of the pipe line 1. Then, ultra-high pressure water is supplied from a hose 4 extending in front of the water injection nozzle 3, and a jet water stream 5 is injected from the outer periphery of the water injection nozzle 3 toward the inner surface of the conduit 1. While doing so, the hose 4 is pulled from the tip of the conduit 1, the water jet nozzle 3 is advanced through the conduit 1, the jet water flow 5 peels off the foreign matter on the inner surface of the conduit 1, and the foreign matter that has fallen off is jetted. It is cleaned by rinsing with water 6 generated by the water flow 5.

This method is an excellent method because it causes less damage to the inner surface of the pipe line 1 and has good removal efficiency of foreign substances. However, this method uses water as the jet water stream 5, so after passing through the water injection nozzle 3,
Since a large amount of water 6 remains inside, this water 6 is removed by pushing it out with a pig or wiping it with a mop or the like.

Problems to be Solved by the Invention However, although the above method is effective for relatively short pipes of several meters to several tens of meters, when applied to long pipes of several hundred meters or more, There are many problems. That is, after the jet water stream 5 injected from the water injection nozzle 3 hits the inner surface of the pipe line 1 and removes foreign matter, it stays around it and obstructs the foreign matter removal action of the jet water stream 5 that is subsequently injected. . If the pipe line 1 is relatively short, the accumulated water 6 will be discharged from the end of the pipe line 1 to prevent excessive accumulation, but if the pipe line 1 is long, the water 6 will be sufficiently discharged. Therefore, a large amount of water remains in the pipe line 1 around the water injection nozzle 3, and sometimes the pipe line 1 may be filled.
When this happens, the jet water stream injected from the water injection nozzle 3 is weakened by the retained water 6,
It is not possible to apply a sufficient impact to the inner surface of the conduit 1 to peel off the foreign matter.

Also, pipeline 1 buried in a relatively shallow part of the ground.
In this case, during the installation, other pipes or various underground structures may be encountered and it may be necessary to bypass these. In this case, as shown in FIG. 4, an overhang 7 is formed by bending the conduit 1 into a substantially U-shape. When the above-mentioned method is applied to the pipe line 1 having such an overhang 7, the water injected from the water injection nozzle 3 stays in the pipe line 1 at the overhang 7 part, and the water injected from the water injection nozzle 3 stays in the pipe 1 at the overhang 7 part. Channel 1 is completely filled with water.

When the water injection nozzle 3 reaches the overhang 7 in this state, the jet water flow 5 is released from the water injection nozzle 3.
Even if the jet water stream 5 is injected, the jet water stream 5 cannot impact the inner surface of the pipe line 1, and the foreign matter cannot be removed at all.

Pipe line 1 after further passing through water injection nozzle 3
A large amount of water 6 is left inside, but this water 6 contains a large amount of foreign matter such as rust and scale that has fallen off from the inner surface of the pipe 1. Therefore, conduit 1
Rinse the inside with a large amount of water and remove foreign matter with water 6.
The foreign matter must be completely removed from the inside of the conduit 1 by rinsing it out. This requires a large amount of water, and it is also difficult to treat the wastewater after washing.

Further, after cleaning the inside of the pipe line 1 with a large amount of water, it is necessary to remove the water from the inside of the pipe line 1. When lining the inner surface of the pipe 1 with a lining material as described above, it is difficult to adhere the lining material to the inner surface of the pipe 1 if the inner surface of the pipe 1 is wet.
It is necessary to remove the water and completely dry the inner surface of the conduit 1. Normally, water 6 is passed through the pipe 1 through a pig.
However, if a large amount of water 6 remains in the pipe 1, back pressure is applied to the pig by the water 6, and a large force is required to force the pig through. do. Moreover, the water in the pipe line 1 cannot be completely removed just by passing the pig through the pipe, and a considerable amount of water remains in the pipe line 1.

After pushing out most of the water in the pipe 1 with the pig and removing it, in order to further completely remove the water 6, pass a mop etc. through the pipe 1 to remove the water that has adhered to the inner surface of the pipe 1. Wiping off the water 6 is performed. The motsupu is a bundle of water-absorbing fibers, and by passing it through the pipe 1, it wipes off water adhering to the inner surface of the pipe 1. The amount of water 6 is large, and it is difficult to wipe it off completely in one or two times, and it is often necessary to pass it through repeatedly.

Furthermore, it is impossible to remove the slight amount of moisture adhering to the inner surface of the pipe line 1 using a mop or the like. Then, the inner surface of the pipe line 1 is dried.

As described above, in the conventional method, it is difficult to clean particularly long pipes or pipes having a cover 7, and after cleaning with the water jet nozzle 3,
A complicated process of washing with a large amount of water, draining the water that filled the inside of pipe 1 through a pig, wiping the inside of pipe 1 by passing it through a mop many times, and then drying it with dry air. However, the work required a long time, and the treatment of the discharged water was also difficult.

The present invention has been made in view of the above circumstances, and can be applied to a long pipe or a pipe having an overhang 7 without any problem, and the cleaning tool is passed through the pipe 1 once. The purpose of the present invention is to provide a new pipe cleaning method that can reliably remove foreign matter from the inner surface of a pipe 1 by simply cleaning the pipe, without leaving any water behind, and without generating a large amount of waste water. It is.

Means for Solving the ProblemsThe method of the present invention provides the method of the present invention by attaching a
An insertion block that can pass through the pipe while being in pressure contact with the inner surface of the pipe is attached, a water jet nozzle is attached to the front part of the insertion lump, and the water jet nozzle and the insertion lump are inserted from one end of the pipe. , While injecting a high-pressure jet water stream from the water injection nozzle toward the inner surface of the conduit diagonally forward, applying air pressure sufficient to allow the inserted mass to travel within the conduit behind the inserted mass. The string-like elongated object holds the insertion block to prevent it from traveling, and the string-like elongate object is inserted into the pipe while blowing out the pressurized air forward from between the outer surface of the insertion block and the inner surface of the conduit. The tube is fed into the pipe, and the inserted mass and the water jet nozzle are caused to advance from the one end to the other end of the pipe by the air pressure.

FIG. 1 shows a situation in which the method of the invention is carried out. Reference numeral 8 is a string-like elongated object, and an insertion block 9 is attached to the tip of the string-like elongate object 8. As the string-like long object 8, a long object having flexibility and sufficient strength, such as a string, belt, rope, or wire rope, is used.

The insertion mass 9 has a spherical or cylindrical shape having a diameter that is approximately equal to or larger than the inner diameter of the conduit 1, can be inserted into the conduit 1, and is attached to the inner surface of the conduit 1. It can pass through the pipe line 1 while being in elastic pressure contact.

An example of its structure is shown in FIG. 10 is an elastic body such as a sponge, and a closed-cell polyurethane sponge is suitable. The outer periphery of the elastic body 10 is covered with a jacket 11, and a string-like body 12 such as a wire is inserted through the center of the elastic body 10, and both ends of the string-like body 12 are connected to the insertion mass 9. Loops 13 are formed protruding from both ends. One of the loops 13 is connected to the tip of the string-like elongated object 8.

The elastic body 10 of the insertion block 9 may be exposed on the outside, but since it passes through the pipe line 1 while being pressed against the inner surface of the pipe line 1, a cylindrical cloth or the like is used to reinforce the abrasion resistance. It is preferable to cover it with an outer cover 11 of. Further, this cylindrical cloth may be a simple cloth, but a rubberized cloth may also be used. An elastic body 10 is inserted into an outer sheath 11, a string-like body 12 is inserted through the center of the elastic body 10, and both ends of the outer sheath 11 are squeezed to be firmly tied to the string-like body 12. In a normal state, this insertion mass 9 is made larger than the inner diameter of the conduit 1, as shown by the chain line in FIG.

Note that it is not preferable that the outer surface of the insertion block 9 is smooth and that when inserted into the pipe line 1, it comes into close and airtight contact with the inner surface of the pipe line 1. It is preferable that the outer surface of the insertion lump 9 is rough so that air can leak from between the outer surface of the insertion lump 9 and the inner surface of the pipe line 1 even when it is pressed against the inner surface of the pipe line 1. In that sense too,
It is preferable to use cloth or rubberized cloth as the outer cover 11.

Further, the structure of the insertion block 9 is not limited to the above-described structure in which the elastic body 10 is wrapped in the outer cover 11, but other structures may also be adopted. For example, it is also possible to use an airtight air bag with compressed air sealed therein, through which a string-like body 12 such as a wire is passed. In addition, as the insertion mass 9,
As mentioned above, it is sufficiently larger than the inner diameter of conduit 1,
It is preferable that the material can be passed through the pipe by being compressed, but it may also be something like a pig, which has an inner diameter approximately equal to the inner diameter of the pipe 1 and has almost no compressibility.

A guide wheel 2 is connected to the tip of the insertion block 9, and a water injection nozzle 3 is attached to the front of the guide wheel 2. As the guide wheel 2 and the water injection nozzle 3, those having a conventionally known structure can be used. Third
The figure shows an example of a water injection nozzle 3,
A shackle 15 is attached to the rear of the main body 14, supported by the guide wheel 2, and held approximately at the center of the conduit 1. Further, a hose 4 is coupled to the front part of the main body 14, and the hose 4 is inserted into the pipe line 1 at the front.

The main body 14 has a hollow tubular shape, and a plurality of injection holes 16 are radially bored in several stages in its outer wall. Each injection hole 16 is inclined forward, and is configured to eject jet water stream 5 diagonally forward from the outer surface of the main body 14. The inclination angle of the injection holes 16 is such that the front injection holes 16 are formed at a small angle with respect to the length direction of the pipe line 1, and the rear injection holes 16 are formed at a small angle with respect to the length direction of the pipe line 1.
6 is a large angle.

To carry out the method of the present invention, first, the hose 4 is inserted into the pipe line 1, and the hose 4, the water injection nozzle 3, the guide wheel 2, the insertion block 9, and the string-like long object 8 are inserted. They are connected one after another, the water injection nozzle 3 and the guide wheel 2 are inserted from one end of the pipe line 1, and the insertion block 9 is further inserted.

In this state, ultra-high pressure water is fed into the hose 4 from the other end of the pipe line 1, and the injection hole 16 of the water injection nozzle 3 is
A jet water stream 5 is ejected diagonally forward from the top. The appropriate water pressure of the jet water stream 5 is approximately 500 kg/cm ² .

On the other hand, compressed air is introduced from one end of the pipe line 1 to apply air pressure to the rear part of the insertion block 9. This air pressure is sufficient to allow the insertion block 9 to travel forward in the pipe line 1 against the frictional resistance with the inner surface of the pipe line 1. The value of that pressure is pipe 1
Although it cannot be absolutely defined depending on the inner diameter of the tube, the material and hardness of the insertion block 9, etc., in the case of a pipe with an inner diameter of 300 mm, about 0.1 to 0.3 Kg/cm ² is appropriate. Then, while applying the pressure, the insertion block 9 is stopped from moving forward by the string-like elongated object 8. This creates a pressure difference before and after the insertion mass 9, and the insertion mass 9
Compressed air is ejected forward from between the outer surface of the pipe 1 and the inner surface of the pipe 1.

In this state, the string-like elongated object 8 is fed out into the conduit 1, and the air pressure causes the insertion mass 9 to advance along the conduit 1 from the one end to the other end of the conduit 1, and is pushed by the insertion mass 9. Guide wheel 2 and water injection nozzle 3
The inner surface of the pipe 1 is cleaned by the jet water stream 5 sprayed from the water spray nozzle 3.

Function In the present invention, foreign matter such as rust, scale, oil, etc. adhering to the inner surface of the pipe line 1 is effectively removed by the jet water stream 5 injected from the water injection nozzle 3. The water 6 containing foreign matter that has fallen from the inner surface of the pipe line 1 is swept forward by the airflow ejected from between the insertion mass 9 and the pipe line 1, and is discharged from the other end of the pipe line.

Effects of the Invention According to the present invention, the compressed air behind the insertion block 9 leaks from between the pipe line 1 and the insertion block 9 and is jetted forward, so that the water 6 in front of the water injection nozzle 3 is Since the water is pushed forward by the flow and discharged from the other end of the pipe, the water 6 remaining in the pipe 1 reduces the effect of the jet water flow 5 on removing foreign matter from the inner surface of the pipe 1. Never. In particular, the airflow
In the vicinity of the water injection nozzle 3, the water flows vigorously along the inner surface of the pipe line 1, so that after the water in the jet water stream 5 collides with the inner surface of the pipe line 1, it is blown away along with the fallen foreign matter. Therefore, there is no water on the inner surface of the pipe line 1 in that part, and the foreign matter is exposed, and since the ultra-high pressure jet water stream 5 is injected there, the foreign matter is peeled off and removed extremely efficiently. be able to.

In addition, the pipe 1 located in front of the water injection nozzle 3
Even inside the pipe 1, there is an air flow caused by air ejected from between the insertion mass 9 and the pipe 1,
The water 6 does not accumulate locally in large quantities and is swept away by the air flow.

Furthermore, even if there is a foreclosure 7 in the pipeline, the air pressure at the rear of the foreclosure 7 will push the water 6 accumulated in the foreclosure 7 forward, and the interior of the foreclosure 7 will be completely filled with water. It will never be filled with. Naturally, the water in the cover 7 will not be completely swept away, and a considerable amount of water 6 will remain, but as the water injection nozzle 3 approaches, the airflow will become more intense and the water stagnant in the cover 7 will be swept away. When the water injection nozzle 3 passes through the overhang 7, the remaining water is blown away by the force of the air ejected from between the insertion block 9 and the pipe line 1, and the remaining water is blown away, similar to the straight pipe part. The cleaning effect can be improved.

Further, in the present invention, since the water supplied into the pipe line 1 by the jet water flow 5 is immediately swept away by the air flow, the water 6 does not remain behind the water injection nozzle 3. When the insertion block 9 passes, the small amount of water remaining is blown away by the high-speed air flow between the insertion block 9 and the conduit 1, so that water 6 is left behind the insertion block 9. There is no residue, and the inner surface of the pipe line 1 is only slightly wet. Even when the inventors conducted experiments on the present invention,
After carrying out the present invention, a motsupu made of water-absorbing fibers is passed through the pipe 1 in the same manner as in the conventional method.
I wiped the inside, but the mop after passing through conduit 1 contained almost no water and was only slightly damp.

Therefore, when cleaning a pipe line using the method of the present invention, rust and scale on the inner surface of the pipe line 1 can be removed by simply passing the instrument comprising the water jet nozzle 3 and the insertion block 9 through the pipe line 1 once. , it is possible to reliably remove foreign substances such as oil, and even if the pipe is a long pipe or has an overhang 7, there will be no inconvenience caused by the accumulated water 6, and the jet water flow 5 will clean the inner surface of the pipe. can be cleaned reliably.

Further, in the present invention, all the water injected from the water injection nozzle 3 is discharged from the other end of the pipe together with foreign matter,
No water or foreign matter separated from the inner surface of the pipe line 1 remains after passing through the equipment, and the steps required in conventional methods, such as washing with water, draining water with a pig, and wiping the water with a mop etc., are completely unnecessary. After the present invention, dry air is introduced into the pipe line 1 and the pipe line 1 is
It is possible to dry and move on to the next process immediately, and cleaning can be completed in a short time, resulting in high work efficiency.

Further, according to the present invention, there is no need to wash with water after cleaning, so an unnecessarily large amount of water is not required, and the water is not discharged, so there is no need for wastewater treatment.

Furthermore, in the present invention, since the water injection nozzle 3 and the insertion block 9 are passed through the pipe line 1 by air pressure, no tension is applied to the hose 4. Therefore, there is no need to pull the hose 4 in order to move the instrument forward, and excessive frictional resistance does not occur between the hose 4 and the pipe line 1, and there is no possibility of scratches caused by the hose 4 rubbing against the inner surface of the pipe line 1 or foreign objects. It never sticks.

[Brief explanation of drawings]

FIG. 1 is a central vertical cross-sectional view showing the state in which the inner surface of the pipe is cleaned according to the present invention. FIGS. 2 and 3 are central vertical cross-sectional views of the insertion block and water injection nozzle used in the present invention, respectively. FIG. 4 is a central vertical cross-sectional view showing the state in which the inner surface of the pipe is cleaned by a conventional method. 1...Pipeline, 3...Water injection nozzle, 5...Jet water stream, 8...String-like long object, 9...Threading block.

Claims (1)

[Claims] 1 At the tip of the string-like elongated object 8, an insertion block 9 that can pass through the pipe line 1 while being in pressure contact with the inner surface of the pipe line 1
Attach the water injection nozzle 3 to the front part of the insertion block 9, insert the water injection nozzle 3 and the insertion block 9 from one end of the pipe line 1, and insert the water injection nozzle 3 and the insertion block 9 into the inner surface of the pipe line 1 diagonally in front of the water injection nozzle 3. While injecting high-pressure jet water stream 5 toward
While applying air pressure that is sufficient for the insertion mass 9 to run inside the pipe line 1, the string-like elongated object 8 holds the insertion mass 9 and prevents its movement, and the outer surface of the insertion mass 9 and the pipe line are The string-like elongated object 8 is fed into the conduit 1 while blowing out the pressurized air forward from between the inner surface of the conduit 1, and the insertion mass 9 and the water injection nozzle 3 are inserted from the one end of the conduit 1 by the air pressure. A method for cleaning a conduit, characterized by allowing the conduit to proceed to the other end.