JP6097481B2 - Water and sewage main cleaning method and water and sewage main cleaning device - Google Patents

Description

  The present invention relates to a pipe cleaning method and a pipe cleaning apparatus, in particular, a pipe cleaning method for cleaning the inside of a pipe by feeding a sherbet-like fluid into the pipe, causing the pipe to flow and discharge, and The present invention relates to a pipe cleaning device.

  Pipe lines are used in various forms in various places. For example, there are water supply and sewerage systems, pipes for sending raw materials and fuels in factories, domestic drainage pipes, and the like. There are various forms of an object flowing through a pipeline, such as gas, liquid, and solid. These pipes need to be regularly inspected and cleaned so that problems such as clogging do not occur.

  As an example, a water supply pipe line will be described. Steel pipes, cast iron pipes, synthetic resin pipes, and the like are used for water supply pipes. Steel pipes and cast iron pipes that have been preliminarily provided with a resin lining (for example, epoxy, polyester, etc.) are used in order to prevent rust and the like generated by long-term use. Therefore, the inner wall surface of the pipe of the water supply is configured so that deposits and the like are difficult to adhere to it, but it has been used for many years, and the minute content that has passed through the minerals or filtration contained in the tap water. Sand, foreign matter, slime due to organic matter, etc. will adhere. Over time, these deposits become several millimeters containing iron and manganese, and gradually accumulate on the inner wall surface of the pipe. The enlarged deposit (scale) causes partial destruction by the water flow, and separated pieces come out from the faucet. Further, when red rust or the like is generated on the inner wall of the pipe, the tap water is discolored and colored water comes out from the faucet. When tap water changes color, health problems also arise.

  In order to prevent such a phenomenon from occurring, it is necessary to periodically clean the pipeline. Conventionally, there have been a pig method (for example, Patent Documents 1 and 2) and a nozzle method (for example, Patent Document 3) as a method for cleaning a water supply pipe line. In the pig method, a bullet-shaped or spherical pig (moving body in a pipe line) made of foamed elastic material is fed into the main pipe and pumped with fluid pressure to bring the outer peripheral surface of the pig into contact with the inner wall surface of the pipe line. The scale is removed. On the other hand, with the nozzle method, the nozzle is fixedly attached to the insertion tip of the hose, and the scale attached to and deposited on the inner wall surface of the pipe is removed by injecting high-pressure water from the nozzle while the hose is inserted into the pipe line. To do.

  In recent years, a cleaning method (Patent Document 4) using a sherbet-like fluid has attracted attention. This method uses a sherbet-like fluid formed of small ice particles and water instead of a solid pig, and this fluid is fed into the pipeline from the inlet of the pipeline and flows through the pipeline. A sherbet-like fluid is discharged from the exit of the road. When ice particles constituting the fluid flow in the pipe, deposits (scale) such as red rust adhering to the inner wall of the pipe are scraped off, and the pipe is cleaned. A sherbet-like fluid is formed only of ice particles and water that is a dissolved product of the ice particles, and is harmless to the human body and the environment. Since it is sherbet-like, for example, a pipe is bent or constricted, and further T-shaped Since it can pass even if it has a complicated shape such as a connecting pipe, it can be cleaned regardless of the shape of the pipe.

  In the cleaning method using the sherbet-like fluid described above, when ice particles flow in the pipeline as described above, the ice particles collide with and contact the inner wall of the pipeline and adhere to the inner wall of the pipeline. A physical external force is applied to the deposit or the like, and a large deposit or the like is scraped off (so-called brushing effect). In addition, the deposits left behind and the minute deposits that adhere to them are cracked, loosened, and frictioned by collision and contact of ice particles, and these deposits of water, which are melted ice particles, etc. The permeability to is further increased. Therefore, the sherbet-like fluid composed of ice particles and water flows in the pipe, so that the inner wall of the pipe is effectively cleaned. Note that even if ice particles remain in the pipe, they will melt and no health problems will occur.

Japanese Patent Laid-Open No. 2001-191045 JP 2009-66522 A Japanese Patent Laid-Open No. 9-10716 Special table 2003-519571 gazette

  When the pipe line is washed with the conventional pig method or nozzle method using solid pigs, large deposits can be removed, but the organic wall, etc. remains on the inner wall of the pipe and cannot be washed sufficiently. There is. That is, relatively large deposits deposited on the inner wall can be removed by a pig or the like, but even minute organic substances adhering to the inner wall cannot be completely removed. In addition, in the pig method and the nozzle method, when the pipeline is bent, when the diameter of the pipeline is small, and when the pipeline extends over a long distance, it cannot be applied or is difficult to apply. .

  In addition, when deposits attached to the inner wall of the pipeline are removed with a pig, etc., and then detergents or chemicals are used, it is possible to remove organic substances, etc., but an addition to wash away the detergents and chemicals used. Work is required. Further, in a pipeline used for transporting raw materials such as food, when chemicals are used for removing organic substances, the subsequent processing is more complicated. That is, in a pipeline that handles drinking water, food, and the like, it is particularly necessary to wash away sufficiently so that no chemicals or the like remain in the pipeline.

  On the other hand, the cleaning method using a sherbet-like fluid does not have the above-mentioned problem, but further improvement in efficiency has been desired. That is, since the fluid is simply caused to flow in the pipe line, the cleaning efficiency is not high. Further, since the ice particles as a material only pass through the pipe, it is not sufficiently used for so-called brushing of the pipe inner wall and is not economical. Therefore, there has been a demand for a method and an apparatus that have high cleaning efficiency and are economical.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the cleaning efficiency in a pipe cleaning method and a pipe cleaning apparatus using a sherbet-like fluid. An object of the present invention is to provide a pipe cleaning method and a pipe cleaning apparatus.

To achieve the above object, the present by water and sewage mains cleaning method according to claim 1, which feeds the sherbet-like fluid in the water and sewage mains, it is discharged by flowing in the main pipe in water and wastewater main cleaning method of cleaning the inside of the tube,
The gas addition supplied to sump to form gas fluid that is fed into the said main, said a pulsating state, the feeding pressure given the strength to the mains fluid containing the gas reservoir said gas reservoir by compressing and expanding the said fluid in the main pipe is reciprocated, the ratio with respect to the fed the fluid of the gas is 10%, about 3 to volume ratio by It is characterized by.

According to this method, gas is added supplied fluid is, when fed into the main pipe in the state of pulsation, the gas is added supplied to the fluid is compressed and fed into the main pipe in conjunction with the fluid while being inflated. This gas compression by being inflated, the reciprocating motion of the fluid in the tube is strained cause. Therefore, improved brushing effect by the fluid in the main pipe, the cleaning efficiency of the main pipe is increased. Further, by setting the ratio of the gas to the fluid that has been sent to approximately 3 to 10% in volume ratio, the reciprocating motion of the fluid due to the compression and expansion of the gas can be effectively realized, and by the brushing of the fluid The efficiency of cleaning is effectively increased.

Water and sewage mains cleaning method according to claim 2, in water and sewerage mains cleaning method of claim 1, wherein the additional supply of gas into the fluid, by feeding air into the fluid, the flow It is performed by forming bubbles or air reservoirs in the body. Therefore, for example, by sending air to the fluid by an air compressor or the like, it is possible to easily form bubbles or an air reservoir in the fluid. Moreover, since air is used instead of expensive gas, it is advantageous in terms of cost, and safety in use of the pipe line after cleaning is ensured.

Water and sewage mains cleaning method according to claim 3, in water and sewerage mains cleaning method of claim 1, wherein the additional supply of gas into the fluid, by introducing a gas generating agent in the fluid , By forming bubbles or gas reservoirs in the fluid. As the gas generating agent, for example, a foaming agent mainly composed of sodium hydrogen carbonate or dry ice can be used. When a foaming agent as a gas generating agent is introduced into the fluid, powdered sodium hydrogen carbonate (bicarbonate), which is the main component of the foaming agent, and powdered citric acid or fumaric acid dissolve in water, and both react. Wake up to generate carbon dioxide. Further, when dry ice as a gas generating agent is introduced into the fluid, the dry ice touches water and sublimates to generate carbon dioxide. Therefore, carbon dioxide can be easily added and supplied as a gas into the fluid, and bubbles or gas reservoirs of carbon dioxide can be formed in the fluid. The amount of carbon dioxide gas to be additionally supplied can be easily adjusted according to the amount of the gas generating agent to be added in accordance with the state of contamination of the pipe line. Incidentally, dry ice, since the solid is -79 ° C. (1 atm), has the effect of preventing the dissolution of ice particles in the fluid in the main pipe, the main pipe to be cleaned is effective when a long.

Water and sewage mains cleaning method according to claim 4, in water and sewerage mains cleaning method according to any one of claims 1 to 3, the fluid, grinding for grinding the inner wall surface of the main It is characterized by containing a material. Accordingly, it fed the fluid is the reciprocates in the main pipe, since reciprocated abrasives which contains, abrasive brushing effect of grinding by fluid to the inner wall of the main pipe is further improved.

In order to achieve the above object, the water and sewage main cleaning device according to claim 5 closes the area to be cleaned of the water and sewage main from both sides, feeds a sherbet-like fluid into the area, in water and wastewater main cleaning apparatus for cleaning the inside of the main pipe by discharging by flow has a branch pipe for feeding the fluid in the enclosed area of the main pipe as fluid inlet tube, the said area An air feeding means that has a branch pipe that discharges a fluid as a fluid discharge pipe, and that additionally supplies air to the fluid to form an air reservoir on the fluid introduction pipe side, and the fluid that has been fed An additional pressure changing means for making the additional pressure with respect to the pulsating state with strength increased and decreased is connected.

According to this configuration, fluid air is added supplied, the feeding pressure of the main pipe is performed in the state of pulsation, air that has been added supplied to the fluid is compressed, the main pipe in conjunction with the fluid while being inflated Is sent to. This air is compressed, when inflated, since the fluid in the main pipe reciprocates, brushing effect by the fluid is further improved cleaning effect of the main pipe is further improved.

  According to the pipeline cleaning method of the present invention, the sherbet-like fluid fed into the pipeline is reciprocated in the pipeline, so that the brushing effect of the fluid is enhanced. Furthermore, since the fluid is used repeatedly, the economy is good. By improving the cleaning efficiency, the quality of the cleaning operation can be improved and the cleaning operation can be further shortened.

BRIEF DESCRIPTION OF THE DRAWINGS It is schematic explanatory drawing applied to the waterworks main pipe in connection with 1st Embodiment of the pipe line washing | cleaning apparatus of this invention. It is a schematic explanatory drawing applied to the waterworks main pipe in connection with 2nd Embodiment of the pipe line washing | cleaning apparatus of this invention.

(First embodiment)
Hereinafter, a first embodiment of a pipe cleaning device of the present invention will be described in detail with reference to the drawings. In the embodiment, an example in which the present invention is applied to cleaning of a water main is shown. The sherbet-like fluid consists of ice particles and water, and the ratio is 7 to 9 to 3 to 1. That is, most are ice particles. In addition, salt is appropriately added to the fluid, and the amount is approximately 0.3% by mass.

  FIG. 1 is a schematic explanatory diagram of the entire cleaning apparatus. The pipe line to be cleaned is the water supply main 40, and the water supply main 40 is buried at a predetermined depth from the ground. A plurality of water control valves 42 are connected to the water supply main 40 on the way. Furthermore, the water supply main pipe 40 is provided with a plurality of branch pipes. Usually, a fire hydrant (not shown), a drainage pipe (not shown), etc. are connected to these branch pipes. In FIG. 1, branch pipes 44a and 44b protrude into recesses 46a and 46b dug to a predetermined depth from the ground, and water stop valves 48a and 48b are provided at respective ends.

  In FIG. 1, a section closed by two water control valves 42, 42 is specified as a cleaning region 40 a of the pipe 40. A fluid introduction hose or the like is connected to one branch pipe 44 a to constitute the fluid introduction pipe 24. A fluid discharge hose or the like is connected to the other branch pipe 44 b to constitute the fluid discharge pipe 30. A sherbet-like fluid 26 is fed from the fluid introduction tube 24 into the cleaning region 40 a of the conduit 40. From the fluid discharge pipe 30, the fluid 26 sent to the cleaning region 40 a of the pipe line 40 flows out and is discharged.

  A fluid pressure feeding means 14 is connected to the fluid introduction pipe 24, and an ice tank 16 and an air compressor 18 as an air feeding means are connected to the fluid pressure feeding means 14. The ice tank 16 stores ice particles having a predetermined size or less, and includes a screw or the like for sending out ice. Ice particles are supplied from the ice tank 16 to the fluid pressure feeding means 14, and a sherbet-like fluid 26 is formed.

  Here, the fluid pressure feeding means 14 includes, for example, a screw (not shown) for feeding the fluid 26 to the cleaning region 40a. By adjusting the rotation speed of this screw, it is possible to change the feeding pressure of the fluid into the pipe line, and by sucking from the state where the fluid was pumped by reversing the rotation direction of the screw It is also possible to change to a state.

  The fluid pressure feeding means 14, the ice tank 16, and the air compressor 18 are collectively controlled by the control unit 20. The control unit 20 is configured so that the feeding pressure of the fluid 26 from the fluid pressure feeding means 14 to the cleaning region 40a can be in a so-called pulsating state with strength. The period of the pulsation state can be arbitrarily set, and in the present embodiment, it is in the range of 0.5 to 5 seconds.

  The air compressor 18 that is used to form air bubbles or an air reservoir in the fluid 26 has a fluid introduction tube when the fluid 26 is introduced from the fluid pressure feeding means 14 into the fluid introduction tube 24. Air is sent to 24. This air feeding can be performed while introducing the fluid 26 into the fluid introduction pipe 24 or stopping the introduction. Furthermore, air can be fed continuously or intermittently, and the pressure fed can be in a so-called pulsating state with strength. In this way, in addition to setting the feeding pressure of the fluid 26 to a pulsating state, the fluid 26 can be effectively reciprocated by adding strength to the pressure of the feeding air. Note that the air compressor 18 is configured such that the amount and pressure of air to be fed can be adjusted by the control unit 20 described above. The air sent in forms bubbles or air reservoirs in the sherbet-like fluid 26 as described above. Further, when the water stop valve 48b on the fluid discharge pipe 30 side is fed into the conduit 40 in a pulsating state, for example, the pulsation state is effectively realized by adjusting the opening and closing of the valve. It is also possible to do so.

  Here, although air bubbles are not shown in FIG. 1, an air reservoir is indicated by reference numeral 28. The air reservoir 28 exists over the entire cross section of the cleaning region 40a or along the upper inner wall of the cleaning region 40a. In addition, it exists in the cleaning region 40a in various forms.

  In the cleaning operation, while the air is additionally supplied to the fluid 26 by the air compressor 18, the fluid 26 is filled into the cleaning region 40a. The filling is performed by setting the feeding pressure of the fluid 26 to a so-called pulsating state by the control unit 20. When the fluid 26 additionally supplied with air is sent to the cleaning region 40a in a pulsating state, the air reservoir 28 formed by the additionally supplied air repeats compression and expansion. When the air reservoir 28 advances in the cleaning region 40a together with the fluid 26 while compressing and expanding, the fluid 26 reciprocates in the pipe 40, and brushing by the fluid 26 containing ice particles is performed. This will enhance the effect of While performing such reciprocating motion, the fluid 26 flows through the cleaning region 40 a and is finally discharged to the discharge tank 32.

  Here, a case where the air reservoir 28 passes through a portion where the scale 34 or the like is present in the cleaning section 40a will be considered as still another function of the air reservoir 28. The inner diameter of the conduit 40 where the scale 34 is present is small. When the fluid 26 including the air reservoir 28 passes through the portion where the scale 34 is present, the diameter of the pipe 40 is reduced, so that the pressure of the air reservoir 28 is compressed, and the scale 34. After passing through the part where there is, it will expand instantaneously. By this compression and expansion action, the fluid 26 vibrates in various directions and further amplifies the reciprocating motion described above. Accordingly, the brushing effect of the inner wall of the ice particle conduit 40 is further enhanced.

  The fluid 26 introduced from the fluid introduction pipe 24 and having passed through the cleaning region 40 a of the conduit 40 is discharged from the outlet of the fluid discharge pipe 30 to the drain tank 32 by the discharge hose 38. Immediately after the start of cleaning, rust and scale in the cleaning region 40a are removed by the cleaning effect of the fluid 26, and the discharged sherbet-like fluid 26 is colored brown. As it progresses, the color gradually fades. By the time cleaning is completed, the sherbet-like fluid 26 is transparent. Therefore, it is possible to determine whether or not the cleaning is completed while observing the color of the fluid 26 to be discharged. You may make it confirm the washing | cleaning progress state of the pipe line 40 by attaching measuring instruments, such as a turbidimeter, to the fluid discharge pipe 30 side. This is effective when the color of the fluid cannot be visually confirmed. It is also effective to install a measuring instrument for measuring contaminants when the fluid 26 containing contaminants in the pipeline to be cleaned is not colored.

  Here, the sherbet-like fluid 26 may contain an abrasive having a diameter smaller than that of the ice particles, for example, a small iron ball. For example, the grinding material may be fed into the fluid introduction pipe 24 by providing the grinding material feeding means in the fluid pressure feeding means 14. When the fluid 26 flows while reciprocating in the cleaning region 40a, the thrown iron ball also flows while reciprocating, so this small iron ball moves along the inner wall surface of the pipe line 40. It is possible to grind and clean the pipeline more effectively. The charged abrasive is not recovered at the outlet of the fluid discharge pipe 30.

In the present embodiment, the pipe has a diameter of about 20 cm, the used ice particles have a diameter of about 5 mm or less, and the amount of the sherbet-like fluid 26 delivered from the fluid pumping means 14 is about 0.1 per minute. To 0.2 m ³ . The air from the air compressor 18 was continuously or intermittently fed while introducing the fluid 26 into the fluid introduction pipe 24. The amount of air fed in was about 3 to 10% with respect to the volume of fluid 26 being fed. Further, the feeding pressure of the fluid 26 was changed in the range of about 0.05 to 0.5 Mpa. After cleaning, the inside of the conduit 40 was observed with a fiberscope or the like, and the small scales and the like were completely removed. Further, the amount of the fluid 26 used could be greatly reduced compared to the conventional case.

When the dirt in the pipe line 40 is severe or when a small scale or the like is present in large quantities, it is effective to put a small iron ball as an abrasive into the ice sherbet-like fluid 14. This was confirmed by observing the inside of the pipe line 40 with a fiberscope after washing.

  In addition, the same effect was confirmed when a gas reservoir such as carbon dioxide was formed in the fluid 26 instead of the air reservoir. The gas reservoir of carbon dioxide can be formed by introducing a gas generating agent into the fluid 26 by a gas generating agent charging means or the like and generating carbon dioxide gas in the fluid 26. As the gas generating agent to be introduced, for example, a foaming agent or dry ice can be used, and the amount of carbon dioxide formed in the gas reservoir portion with respect to the fluid 26 can be adjusted by the amount to be introduced. In addition, since the gas such as carbon dioxide is dissipated after the cleaning of the conduit 40, no health problem occurs.

  According to the pipe line cleaning method of the present embodiment, the fluid 26 in which the air reservoir 28 is formed is sent into the pipe 40 in a pulsating state, so that the fluid 26 reciprocates in the cleaning region 40a. Therefore, the effect of brushing the fluid 26 is enhanced, and the inside of the conduit 40 can be effectively cleaned. Further, as compared with the conventional method of simply flowing in the conduit 40, the fluid 26 is reciprocated, that is, it is used repeatedly for brushing, which is economical.

(Second Embodiment)
FIG. 2 is an overall explanatory view according to the second embodiment of the pipe cleaning device of the present invention. In the present embodiment, fluid suction / pumping means 36 is attached to the fluid introduction pipe 24 and the fluid discharge pipe 30 in the conduit cleaning apparatus shown in FIG. The fluid suction / pressure feeding means 36 includes, for example, a screw that feeds the fluid into the conduit 40. By reversing the rotation of the screw, both the suction operation and the pressure feeding operation can be performed. It is configured to be possible. Each fluid suction / pumping means 36 includes a surge tank (not shown) therein. Here, the air compressor 18 as the air feeding means shown in FIG. 1 is not connected. Moreover, the control part 20 which makes the pressure applied to the fluid 26 a pulsating state is not attached.

  The fluid suction / pressure feeding means 36 connected to the fluid introduction pipe 24 sends the sherbet-like fluid 26 through the fluid introduction pipe 24 to the cleaning region 40 a of the conduit 40. Note that, like the first embodiment, the fluid 26 contains salt. On the other hand, a discharge hose 38 is attached to the fluid suction / pressure feeding means 36 attached to the fluid discharge pipe 30 so that the fluid 26 discharged from the fluid suction / pressure feeding means 36 is stored in the drain tank 32. It is configured.

  In the cleaning method, first, the fluid 26 is fed into the cleaning region 40 a closed in the conduit 40 through the fluid introduction tube 24 by the fluid suction / pressure feeding means 36 on the fluid introduction tube 24 side. The feeding pressure of the fluid 26 may be constant. The cleaning area 40 a is filled with the fluid 26. Next, the fluid 26 fed into the cleaning region 40a is moved along the pipe line 40 in the cleaning region 40a by the fluid suction / pressure feeding means 36 attached to the fluid introduction tube 24 and the fluid discharge tube 30. Reciprocate.

  The above-described reciprocating motion is realized by alternately performing a suction operation and a pumping operation by the respective fluid suction / pressure feeding means 36 attached to the fluid introduction pipe 24 and the fluid discharge pipe 30. That is, a pressure feeding operation is performed on the fluid introduction pipe 24 side, a suction operation is performed on the fluid discharge pipe 30 side for a predetermined time, and then a suction operation is performed on the fluid introduction pipe 24 side and a pressure feeding operation is performed on the fluid discharge pipe 30 side. Repeat the operation only for the time. Therefore, since the fluid 26 in the cleaning region 40a reciprocates back and forth in the feeding direction along the pipe 40, the scale 34 and the like adhering to the inner wall of the pipe 40 is removed by the brushing effect of the fluid 26. Will be. Here, the surge tank provided in the fluid suction / pressure feeding means 36 is configured such that when the fluid 26 in the cleaning region 40a is reciprocated by the fluid suction / pressure feeding means 36, the fluid introduction pipe 24 or The fluid 26 temporarily overflows from the fluid discharge pipe 30, but this is for temporarily storing the overflowed fluid 26.

  After the fluid 26 is reciprocated in the cleaning region 40a for a predetermined time, the fluid suction / pumping means 36 on the fluid introduction tube 24 side is pumped to remove the scale and the like in the cleaning region 40a. The containing fluid 26 can be discharged to the drainage tank 32. In the present embodiment, filling of the fluid 26 into the cleaning region 40a and reciprocation may be repeated.

  According to the second embodiment of the conduit cleaning device of the present invention, the sherbet-like fluid 26 fed into the cleaning region 40a of the conduit 40 reciprocates back and forth in the feeding direction within the cleaning region 40a. Therefore, the brushing effect of the fluid 26 is enhanced, and the inside of the conduit 40 can be effectively cleaned. The fluid 26 is economical because it is used repeatedly by reciprocating. In addition, as described in the first embodiment, the effect of brushing can be enhanced by adding abrasive to the fluid 26.

  In addition, in said 1st, 2nd embodiment, although the water-pipe main was taken as an example and the pipe line washing | cleaning apparatus of this invention was demonstrated as an example, it is not limited to these embodiment. Various modifications can be made without departing from the spirit of the invention. For example, the main pipe for cleaning may be a sewer main, various pipes in a factory, pipes for handling food, etc., a household drain pipe, or the like. Further, in the first embodiment, the fluid 26 filled in the cleaning region 40a is reciprocated in the conduit 40 by the method shown in the second embodiment to further increase the cleaning efficiency. It is also possible.

DESCRIPTION OF SYMBOLS 10 Pipe line cleaning apparatus 14 Fluid pressure sending means 16 Ice tank 18 Air compressor (air feeding means)
20 Control part 24 Fluid introduction pipe 26 Fluid 28 Air accumulation part 30 Fluid discharge pipe 32 Discharge tank 34 Scale etc. 36 Fluid suction / pumping means 38 Discharge hose 40 Pipe line 40a Washing area 42 Water control valves 44a, 44b Branches Pipe 46a, 46b Recess 48a, 48b Water stop valve

Claims (5)

Feeding a sherbet-like fluid in the water and sewage mains, in water and sewerage mains cleaning method for cleaning the inside of the main pipe by discharging by flowing in the main pipe,
The gas addition supplied to sump to form gas fluid that is fed into the said main pipe,
Reciprocating said fluid in said main by compressing and expanding the gas reservoir by said pulsating state, the feeding pressure given the strength to the mains fluid containing the gas reservoir then,
A method for cleaning a water and sewer main, wherein the ratio of the gas to the fed fluid is approximately 3 to 10% by volume . The additional supply of gas to the fluid is
The method for cleaning a water and sewer main according to claim 1 , wherein air is fed into the fluid to form bubbles or an air reservoir in the fluid. The additional supply of gas to the fluid is
The method of cleaning a water and sewer main according to claim 1 , wherein the method is performed by introducing a gas generating agent into the fluid to form a gas reservoir in the fluid. Wherein the fluid, water and sewage mains line cleaning method according to any one of claims 1 to 3, characterized in that it contained abrasive for grinding the inner wall surface of the main passage. Close the cleaning target area of water supply and sewerage mains from both sides, feeding a sherbet-like fluid to the area, in water and sewerage mains cleaning device for cleaning the inside of the main pipe by discharging by flowing within that region,
A branch pipe for feeding the fluid in the closed region of the main pipe as a fluid introduction pipe;
A branch pipe for discharging the fluid in the region as a fluid discharge pipe;
On the fluid introduction pipe side,
Air feeding means for additionally supplying air to the fluid to form an air reservoir;
A water and sewage main cleaning device, which is connected to an additional pressure changing means for changing the applied pressure to the flowed fluid into a pulsating state with strength.

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