JP7255830B2 - Pipe cleaning method and pipe cleaning system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipeline cleaning method and a pipeline cleaning system, and more particularly to a pipeline cleaning method and a pipeline cleaning system for cleaning the inside of a pipeline using a sherbet-like fluid.

Pipes that carry fluids, such as water supply pipes and sewage pipes, pipes that send raw materials and fuel in factories, and pipes such as drainage pipes in homes, come in various forms according to their various uses. used. Furthermore, the objects flowing through the pipeline are not limited to liquids, and there are various forms such as gases and solids.

Deposits and the like adhere to the inside of these pipelines due to long-term use. For example, in a sewage pipe, filth and the like contained in domestic wastewater and industrial wastewater discharged into the pipe adhere to the inner wall of the pipe, forming deposits. In addition, although water supply pipes are generally designed to prevent sediment from adhering, minerals contained in tap water, fine foreign matter and organic substances that have passed through filtration, and slime, etc., adhere to the inner wall of the pipe. and accumulate over time.

In order to prevent troubles such as clogging due to adhesion of such sediments, it is necessary to clean the pipeline periodically.

Conventional methods for cleaning pipelines include a pig method in which a cleaning pig is inserted into the pipeline and moved (for example, Patent Document 1), and a nozzle attached to the tip of a hose inserted into the pipeline. A nozzle system that injects water (for example, Patent Document 2) is known. However, these methods are difficult to apply to pipelines of various shapes, and in recent years, as a method to replace these methods, a cleaning method using a sherbet-like fluid has attracted attention (patent Reference 3).

In this cleaning method, a sherbet-like fluid containing small ice particles in the liquid is pressurized and injected into the pipeline to move the fluid, thereby removing deposits in the pipeline. Specifically, when the fluid moves inside the pipeline, the ice particles that make up the fluid come into contact with or collide with the sediment attached to the inner wall of the pipeline, thereby exerting a physical external force on the sediment. is added and the sediments are scraped off. The scraped sediment is discharged from the outlet of the pipeline together with the fluid.

In this washing method, since the fluid is in the form of sherbet, It is possible to smoothly discharge sediment by allowing fluid to pass through it, making it suitable for cleaning pipes of various shapes.

Japanese Unexamined Patent Application Publication No. 2001-191045 JP-A-9-10716 Japanese Patent No. 4653921

However, there is a problem that the sediments adhering to the inside of the pipeline cannot be sufficiently removed only by the physical external force due to the contact and collision of the ice particles that constitute the fluid. In other words, in order to maintain the fluidity, the ice particles that make up the fluid are set to a relatively small particle size, and the ability of ice particles to remove deposits adhering to the inner wall of the pipe is limited to the surface area. Only the roots of the sediments could be scraped off, leaving unshavings at the roots of the deposits.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pipeline that can be applied to pipelines of various shapes and has a high effect of removing deposits adhering to the pipeline. An object of the present invention is to provide a cleaning method and a pipeline cleaning system.

In order to achieve the above object, the invention according to claim 1 pressurizes and injects a sherbet-like fluid containing water and ice particles into a section of a pipeline to be cleaned to remove deposits in the pipeline. In the pipeline cleaning method to remove,
a step of mixing solid particles larger in diameter than ice particles constituting the fluid into the fluid at a constant ratio to produce a mixture of the fluid and the solid particles;
and pressurizing and injecting the mixture into the section to be cleaned,
The ice particles constituting the fluid have an average particle size of 0.01 to 0.5 mm, and the content in the fluid is 70 to 95% of the total mass of the fluid,
The solid particles are ice particles with an average particle size of 10 to 60 mm,
The ratio of the fluid in the first layer is 70% by volume or more, and the ratio of the solid particles in the second layer is 50% by volume or more.
Further, the invention according to claim 2 is a pipeline cleaning method in which a sherbet-like fluid containing water and ice particles is pressurized and injected into a cleaning target section of a pipeline to remove deposits in the pipeline. In the method
The fluid and solid particles larger in diameter than the ice particles constituting the fluid are injected into the injection pipe communicating with the cleaning target section, and the fluid is injected into the injection pipe. a step of alternately forming a first layer having a lower solid particle content and a second layer having a higher solid particle content than the first layer;
a step of pressurizing and injecting the first layer and the second layer into the section to be cleaned;
The ice particles constituting the fluid have an average particle size of 0.01 to 0.5 mm, and the content in the fluid is 70 to 95% of the total mass of the fluid,
The solid particles are ice particles with an average particle size of 10 to 60 mm,
The ratio of the fluid in the first layer is 70% by volume or more, and the ratio of the solid particles in the second layer is 50% by volume or more .

According to this configuration, together with the sherbet-like fluid, solid particles having a larger diameter than the ice particles constituting the fluid are pressurized and injected into the pipeline. Large-diameter solid particles can contact, collide, etc., and can scrape off deposits with a greater force than ice particles. As a result, it is possible to exhibit a high removal effect even for deposits adhering to the inner wall of the pipeline.

Further, according to the configuration of claim 1 , the fluidity and scraping property are adjusted by adjusting the ratio of solid particles in the fluid according to the diameter and length of the pipeline, the use of the pipeline, the adhesion state of deposits, etc. can be optimally adjusted.

In addition, according to the configuration of claim 2 , while the first layer ensures the fluidity of the cleaning fluid and the solid particles in the pipeline, the second layer having a high content of solid particles, A high removal effect can be obtained for deposits adhering to the inside of the pipeline.

According to this configuration, since the solid particles are formed of ice particles with an average particle size of 10 mm to 60 mm, it is possible to maintain fluidity while enhancing the scraping performance of deposits. In addition, since the size is generally easy to manufacture and easy to handle, the cost can be suppressed.

Further, the invention according to claim 4 for achieving the above object is a pipeline cleaning system for carrying out the pipeline cleaning method according to claim 1, comprising:
an injection pipe communicating between the section to be cleaned and the outside;
Closing means for closing an open end of the section to be cleaned located at least upstream of the injection pipe;
a fluid injection means for pressurizing and injecting the fluid into the section to be cleaned through the injection pipe;
solid particle injection means for injecting the solid particles having a larger diameter than the ice particles forming the fluid into the section to be cleaned through the injection pipe;
By operating the fluid injection means and the solid particle injection means, a mixture of the fluid and the solid particles is generated in the injection pipe, and the mixture is pressurized and injected into the section to be cleaned. It is characterized by
Further, the invention according to claim 5 is a pipeline cleaning system for carrying out the pipeline cleaning method according to claim 2 ,
the injection pipe communicating between the section to be cleaned and the outside;
Closing means for closing an open end of the section to be cleaned located at least upstream of the injection pipe;
a fluid injection means for pressurizing and injecting the fluid into the section to be cleaned through the injection pipe;
solid particle injection means for injecting the solid particles having a larger diameter than the ice particles forming the fluid into the section to be cleaned through the injection pipe;
By operating the fluid injection means and the solid particle injection means, the first layer and the second layer are alternately formed in the injection pipe, and the first layer and the second layer are formed. layer is pressurized and injected into the section to be cleaned.

According to this configuration, by the fluid injection means and the solid particle injection means, the sherbet-like fluid and the ice particles larger in diameter than the fluid constituting the fluid are injected into the cleaning target section of the pipeline through the injection pipe. Since the solid particles are injected under pressure into the pipe, the large-diameter solid particles can contact and collide with the sediment adhering to the inner wall of the pipe, and the sediment can be deposited with a greater force than ice particles. can be scraped off. As a result, a high removal effect can be exhibited with respect to deposits adhering to the inner wall of the pipeline.

INDUSTRIAL APPLICABILITY The pipeline cleaning method and pipeline cleaning system of the present invention can be applied to pipelines of various shapes, and can achieve a high removal effect for deposits adhering to the inside of the pipeline.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows typically the pipeline cleaning system of the 1st Embodiment of this invention. FIG. 2 is an enlarged view of the area surrounded by II in FIG. 1 and is an explanatory view showing how deposits adhering to the pipeline are removed; Sectional drawing which shows typically the pipeline cleaning system of the 2nd Embodiment of this invention. FIG. 4A is an enlarged view of the area surrounded by IV in FIG. Explanatory drawing showing a state of

(First embodiment)
FIG. 1 is a cross-sectional view schematically showing a pipeline cleaning system 10 according to a first embodiment of the invention. The pipeline cleaning system 10 uses a sherbet-like fluid 12 and solid particles 14 to clean the inside of a pipeline. A plurality of branch pipes 21 and 22 communicating with the water supply main pipe 20, water control valves (closing means) 24a and 24b for closing the upstream and downstream opening ends of the cleaning target section 16 of the water supply main pipe 20, and the water supply main A fluid injection device (fluid injection means) 30 for pressurizing and injecting the fluid 12 into the pipe 20, a solid particle injection device (solid particle injection means) 40 for injecting the solid particles 14 into the water supply main pipe 20, and a collection tank 50 for collecting the fluid 12 and the solid particles 14 .

The water main pipe 20 is buried at a predetermined depth from the ground, and a plurality of water control valves 24a and 24b are installed in the middle of the pipeline. The inner diameter of the water supply main pipe 20 is, for example, approximately 100 to 400 mm. As will be described later, during cleaning, the flow of clean water 29 in the cleaning target section 16 can be stopped by closing the water control valves 24a and 24b located at both ends of the cleaning target section 16 of the water main pipe 20. The length of the section to be cleaned 16 can be, for example, approximately 300 to 4000 m.

The branch pipes 21 and 22 are pipelines branching from the water main pipe 20 and extending to the ground, and are provided in plurality at predetermined intervals in the extending direction of the water main pipe 20 . The branch pipes 21 and 22 are used for inspection of the water supply main pipe 20, etc., and are usually fitted with a fire hydrant or a mud drain pipe (not shown) through water stop valves 21a and 22a.

Of the plurality of branch pipes 21 and 22, the branch pipe 21 located on one end side of the cleaning target section 16 of the water supply main pipe 20 is used as an injection pipe for injecting the fluid 12 and the solid particles 14, and the other end is used as an injection pipe. A branch pipe 22 located on the part side is used as a discharge pipe for discharging the fluid 12 and the solid particles 14 . In the example shown in FIG. 1, branch pipes 21 and 22 protrude into recesses 25 and 26 that are dug from the ground to a predetermined depth, and through water stop valves 21a and 22a attached to branch pipes 21 and 22, , connection pipes 27a and 27b, which are injection pipes, and a connection pipe 28, which is a discharge pipe, are connected.

The fluid injection device 30 includes a tank 31 that stores the fluid 12 and a pumping means (not shown) that pumps the fluid 12 in the tank 31 into the injection communication pipe. In the present embodiment, the fluid injection device 30 is configured by a vehicle (hereinafter referred to as a tank vehicle) equipped with a tank 31 and a screw pump connected to the tank 31 and serving as pressure feeding means. The screw pump 32 can freely change the pressure for sending the fluid 12 to the injection communicating pipe by adjusting the rotation speed of the screw.

The fluid 12 is in the form of sherbet containing water and ice particles, and has fluidity that allows it to move through the pipeline. The particle size (major axis) of the ice particles forming the fluid 12 is 5 mm or less, and preferably the average particle size is approximately 0.01 to 0.5 mm. Also, the content of water in the fluid 12 is about 5-30%, preferably about 15-25%, with respect to the total mass of the fluid 12, the remainder being ice particles. The fluid 12 contains salt, which prevents the water around the ice particles from freezing and maintains its fluidity. The salt content in the fluid 12 is, for example, about 3-7 mass %. After the fluid 12 is produced at the factory, it is stored in the tank 31 of the tank vehicle and transported to the cleaning site.

The solid particle injector 40 injects a large number of solid particles 14 into the water main pipe 20 via an injection pipe. and a screw (not shown) for ejecting particles.

The solid particles 14 are ice particles larger in particle size than the ice particles forming the fluid 12, preferably ice particles with an average particle size of about 10 to 60 mm, more preferably about 20 to 50 mm. Here, the average particle size of about 10 to 60 mm means that the particle size of the ice particles that account for at least 70 to 80% of the total mass of the ice particles that are the solid particles 14 is in the range of about 10 to 60 mm. Say something. The solid particles 14 may be spherical, but preferably have a shape with projections on the surface (for example, an ice block with a polygonal surface, or a distorted ice block with an uneven surface). In addition, when the solid particles 14 have a distorted shape, the particle diameter is the major axis of the solid particles 14 . Salt may be appropriately added to the ice particles that become the solid particles 14 in the same manner as the fluid 12 .

Fluid injector 30 and solid particle injector 40 are located on the ground. The fluid 12 discharged from the fluid injector 30 is pressurized and injected into the water supply main pipe 20 through the first connecting pipe 27a and the branch pipe 21 connected thereto. The solid particles 14 discharged from the solid particle injector 40 are pressurized and injected into the water supply main pipe 20 via the second connecting pipe 27b and the branch pipe 21 . A valve 43 capable of adjusting the injection amount of the solid particles 14 is provided in the second connecting pipe 27b. The downstream end of the second connecting pipe 27b is connected to the first connecting pipe 27a, and the solid particles 14 are mixed with the fluid 12 at this connection.

The solid particles 14 are continuously mixed with the fluid 12 at a constant ratio by appropriately adjusting the discharge amount from each of the fluid injection device 30 and the solid particle injection device 40 . In the mixture of fluid 12 and solid particles 14, the mixing ratio of solid particles 14 is preferably about 10-40% by volume, more preferably about 20-30% by volume.

In addition, although not shown, a controller for adjusting the discharge amount of each of the fluid 12 and the solid particles 14 may be provided at the connecting portion of the first and second connecting pipes 27a and 27b. Furthermore, an agitating device for agitating the mixture of the fluid 12 and the solid particles 14 may be provided at the connecting portion of the first and second connecting pipes 27a and 27b or at the downstream side of the connecting portion. In addition, the first connecting pipe 27a is provided with a pressure feeding means such as a snake pump, for example, to control the injection amount of the mixture of the fluid 12 and the solid particles 14 into the water main pipe 20 and the inside of the cleaning target section 16 of the water main pipe 20. You can adjust the movement speed of

The recovery tank 50 is a tank for recovering the fluid 12 and the solid particles 14 after washing, and is installed at the downstream end of the connection pipe 28, which is a pipe for discharge.

Next, a method for cleaning the water supply main pipe 20 by the above-described pipeline cleaning system 10 will be described.

First, the fluid injection device 30 and the solid particle injection device 40 are connected to the branch pipe 21 via the water stop valve 21a and the first and second connecting pipes 27a and 27b, and the branch pipe 22 is connected to the water stop valve. 22a and the connecting pipe 28, the collection tank 50 is connected. Also, the water control valves 24a and 24b are closed to stop the flow of clean water 29 in the section 16 to be cleaned.

Next, the water stop valves 21a and 22a are opened, the fluid injection device 30 and the solid particle injection device 40 are operated respectively, and the mixture 18 of the fluid 12 and the solid particles 14 is pressurized in the section 16 to be cleaned. inject. The solid particles 14 are mixed with the fluid 12 at a constant mixing rate at the connecting portions of the first and second connecting pipes 27a and 27b, and injected into the water supply main pipe 20 via the branch pipe 21. . The clean water 29 remaining in the section 16 to be cleaned is pushed downstream by the injection of the mixture 18 and discharged.

The mixture 18 is pressurized to fill the cross-section of the pipeline in at least a partial area of the section 16 to be cleaned. The length of the mixture 18 in the tube axis direction is preferably at least about 30 to 50 m or more. In this embodiment, the mixture 18 is filled throughout the section 16 to be cleaned, and is pressurized and injected so as to move in the section 16 to be cleaned at a speed of, for example, about 0.3 to 1.0 m/s. there is The moving speed may be constant, or may be changed within a predetermined range. The mixture 18 is adjusted by valves installed in the injection pipe and the discharge pipe so that the injection amount and the discharge amount for the section 16 to be cleaned are approximately equal. In general, sediment 55 adheres to the inner wall of the water supply main pipe 20 over the entire circumference. By moving the mixture 18, the attached deposits 55 are scraped off and the inside of the pipeline is cleaned.

As shown in FIG. 2, when the deposit 55 adheres to the inner wall, the surface portion 55a of the deposit 55 is rubbed or scraped off by the frictional force of the fluid 12 . The base portion 55b of the deposit 55 left without being removed, ie, the root portion of the deposit 55 adhering to the pipeline, is rubbed or scraped off by contact, collision, or the like of the large-diameter solid particles 14 .

The mixture 18 that has passed through the section 16 to be cleaned and the sediments that have been removed are discharged into the recovery tank 50 via the branch pipe 22 and the connection pipe 28 . Although not shown, a water quality monitoring device is connected to the discharge pipe, and this water quality monitoring device monitors the turbidity, temperature, pressure in the pipe line, etc. of the mixture 18 discharged.

When the injection of the amount of the mixture 18 required for washing is completed, the water stop valve 21a is closed. Next, the water control valve 24a on the upstream side is opened to allow the clean water 29 to flow into the section 16 to be cleaned, thereby sweeping the mixture 18 in the clean water main pipe 20 and discharging it from the branch pipe 22 to the outside. Such flushing of the section to be cleaned 16 with clean water 29 is performed until a predetermined water quality is obtained by the water quality monitoring device. After the predetermined water quality is confirmed, the water stop valve 22a is closed and the water control valve 24b is opened.

In the pipeline cleaning system 10 described above, the solid particles 14 are pressurized into the pipeline together with the fluid 12, so that the solid particles 14 remove the sediment 55 with a greater force than the ice particles that make up the fluid 12. Can be scraped or scraped off. As a result, a high removal effect can be exhibited even for the deposits 55 adhering to the inner wall of the pipeline. Further, the fluidity and scraping property can be optimally adjusted by adjusting the ratio of the solid particles 14 in the fluid 12 according to the diameter and length of the pipeline to be cleaned and the use of the pipeline to be cleaned.

In addition, clogging of the solid particles 14 in the section 16 to be cleaned can be eliminated by the fluid 12 and the solid particles 14 can be moved smoothly. As a result, for example, even if there is a deformed portion where the pipe shape changes (for example, a bent portion of the pipe) in the cleaning target section 16, the deposits 55 generated in this deformed portion can be effectively removed. can be removed. Further, by using ice particles as the solid particles 14, the solid particles 14 remaining in the water main pipe 20 after cleaning can be dissolved by the clean water 29 and discharged.

Further, in the water supply main pipe 20 and the sewage pipe 60, which will be described later, the cleaning target section 16 has a relatively large length and pipe diameter, so a large amount of the fluid 12 is required for cleaning. Since the fluid 12 requires quality control to maintain the sherbet state, production and transportation costs are high. The amount can be reduced, and cleaning costs can be suppressed.

(Second embodiment)
Next, a pipeline cleaning system 10 according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. In addition, in FIG. 3, the same reference numerals are given to the same elements as in the above-described first embodiment, and the description thereof will be omitted.

The pipeline cleaning system 10 of the present embodiment includes a sewer pipe 60 that is a pipeline to be cleaned, and lids (closure means) that close open ends on the upstream and downstream sides of the cleaning target section 16 of the sewer pipe 60. 64 , 65 , injection pipe 67 and discharge pipe 68 , fluid injection device 30 , solid particle injection device 40 , recovery tank 50 , and bypass pipe 70 .

The sewer pipe 60 is buried at a predetermined depth from the ground, and manholes 61 and 62 are installed for each predetermined section along the extending direction of the sewer pipe 60 . The inner diameter of the sewage pipe 60 is, for example, about 150-600 mm. In the present embodiment, the section between the manholes 61 and 62 adjacent to each other is the cleaning target section 16 of the sewage pipe 60 . The length of the cleaning target section 16 is, for example, approximately 15 to 300 m.

The lids 64 and 65 block the opening end of the cleaning target section 16 to prevent water or the like from leaking from the cleaning target section 16, and are made of any material such as metal or resin. There may be. In this embodiment, the lids 64 and 65 are installed at the connecting portions of the sewage pipe 60 and the manholes 61 and 62, respectively, and the opening 64a to which the respective ends of the injection pipe 67 and the discharge pipe 68 are connected. , 65a.

The injection pipe 67 and the discharge pipe 68 are pipes that communicate the sewage pipe 60 with the outside, are flexible in this embodiment, and are inserted into the manholes 61 and 62, respectively. One end of the injection pipe 67 is watertightly connected to the opening 64a of the lid 64, and the other end is connected to the first connection pipe 27a connected to the fluid injection device 30 via the control device 45. , and a second connection pipe 27b connected to the solid particle injection device 40 .

One end of the discharge pipe 68 is watertightly connected to the opening 65 a of the lid 65 , and the other end is connected to the recovery tank 50 . In the illustrated example, a suction pump 52 is provided in the drainage pipe 68 in order to facilitate smooth movement of the fluid 12 and the solid particles 14 in the section 16 to be cleaned. A vacuum vehicle may be used as the suction pump 52 and the recovery tank 50 .

The control device 45 adjusts the amount of the fluid 12 discharged from the fluid injection device 30 and the solid particles 14 discharged from the solid particle injection device 40 injected into the section 16 to be cleaned. In particular, a first layer 71 having a low content of solid particles 14 and a second layer 72 having a higher content of solid particles 14 than the first layer 71 are arranged along the axial direction of the section 16 to be cleaned. Adjust the injection amount so that they are formed alternately.

The control device 45 of the present embodiment includes a switching valve (not shown) controlled by a control unit, and a predetermined amount of fluid 12 and a predetermined amount of solid particles 14 are continuously and alternately injected. It is controlled so that it is injected into the supply pipe 67 . Here, "continuously" means that an air layer is not formed between the injected fluid 12 and the solid particles 14 . By such control, a first layer 71 consisting essentially of the fluid 12 and a second layer 72 consisting essentially of the solid particles 14 are alternately formed in the section 16 to be cleaned.

In addition, the ratio of the fluid 12 and the solid particles 14 in the first and second layers 71 and 72 is not limited to this, and the first layer 71 has a higher content of the solid particles 14 than the second layer 72. is low and can maintain high fluidity. In order to ensure fluidity, the proportion of the fluid 12 in the first layer 71 is preferably about 70% by volume or more, more preferably about 80% by volume or more. Also, the proportion of the solid particles 14 in the second layer 72 is preferably about 50% by volume or more. When the first layer 71 and/or the second layer 72 is composed of a mixture of the fluid 12 and the solid particles 14, the controller 45 may be provided with a stirring unit to stir and mix the fluid 12 and the solid particles 14. good.

The detouring pipe 70 is a pipeline that allows the sewage flowing through the sewage pipe 60 to flow downstream of the sewage pipe 60 by detouring the cleaning target section 16 during pipeline cleaning. The detour pipe 70 extends from one manhole 61 to the other manhole 62 via the ground. A pump 76 attached to the detour pipe 70 pumps up the sewage 75 in the sewage pipe 60 to clean the section 16 to be cleaned. divert and flow downstream.

Next, a cleaning method for the sewage pipe 60 by the above-described pipeline cleaning system 10 will be described.

A detour pipe 70 is installed for the sewer pipe 60, lids 64 and 65 are installed at both ends of the cleaning target section 16 of the sewer pipe 60, and the pump 76 of the detour pipe 70 is operated to remove the sewage 75. Flow to the bypass pipe 70 side. One end of an injection pipe 67 is connected to the opening 64a of the lid 64 located upstream of the cleaning target section 16, and the control device 45 and the first and second connection pipes are connected to the other end of the injection pipe 67. The fluid injection device 30 and the solid particle injection device 40 are connected via 27a and 27b. One end of the discharge pipe 68 is connected to the opening 65 a of the cover 65 located downstream of the cleaning target section 16 , and the recovery tank 50 is connected to the other end of the discharge pipe 68 . The section 16 to be cleaned is filled with water via a third connection pipe (not shown) connected to the injection pipe 67 .

Next, the fluid injection device 30 , the solid particle injection device 40 and the control device 45 are operated to pressurize and inject the fluid 12 and the solid particles 14 into the section 16 to be cleaned through the injection pipe 67 . In this embodiment, in this pressurized injection step, first, the first layer 71 made of the fluid 12 is pressurized in an amount sufficient to fill a predetermined length of the section 16 to be cleaned. As a result, a first layer 71 having a predetermined length is formed in the section 16 to be cleaned.

After the first layer 71 is injected first, the controller 45 continuously pressurizes and injects the second layer 72 composed of the solid particles 14 in an amount sufficient to fill the predetermined length of the section 16 to be cleaned. After that, the first layer 71 is continuously pressurized to fill the predetermined length of the section 16 to be cleaned. By repeating this, in the section 16 to be cleaned, as shown in FIG. The second layers 72 are alternately formed. At the end of the pressurized injection process, the first layer 71 is formed within the section 16 to be cleaned.

The predetermined length L1 of the first layer 71 in the section 16 to be cleaned is preferably equal to or longer than the predetermined length L2 of the second layer 72 . It is preferable that the length of the mixed layer composed of the plurality of first and second layers 71 and 72 in the tube axis direction is at least about 30 to 50 m or more. In the present embodiment, the mixed layer is filled throughout the section 16 to be cleaned, and the moving speed of the mixed layer in the section 16 to be cleaned is set to approximately 0.3 to 1.0 m/s. . The moving speed may be constant, or may be changed within a predetermined range. For example, the movement speed may be slow immediately after the start of work and fast just before the end of work.

In general, the sewage pipe 60 tends to have deposits 55 attached to the bottom of the pipe. As shown in FIG. 4( a ), when deposits 55 adhere to the bottom of the sewer pipe 60 , the movement of the first layer 71 causes the frictional force of the fluid 12 to cause the surface of the deposits 55 to The portion 55a is scraped or scraped off. As shown in FIG. 4B, the base 55b of the deposit 55 left unremoved is rubbed or scraped off by contact, collision, or the like of the solid particles 14 in the second layer 72. As shown in FIG.

The fluid 12 , the solid particles 14 , the removed sediments, etc. that have passed through the section 16 to be cleaned are discharged into the recovery tank 50 via the discharge pipe 68 . In the present embodiment, the second layer 72 is a layer of only the solid particles 14, but since both sides are sandwiched between the first layers 71, the solid particles 14 can move smoothly in the pipeline. A water quality monitor (not shown) is connected to the discharge pipe 68, and this water quality monitor monitors the turbidity, temperature, pressure in the pipe, etc. of the discharge.

After the injection of the amount of the fluid 12 and the solid particles 14 required for cleaning is completed, flushing is performed by flowing water from the injection pipe 67 into the section 16 to be cleaned. This flushing is continued until a predetermined water quality is confirmed by the water quality monitor. The solid particles 14 remaining in the sewage pipe 60 after cleaning can be naturally discharged by melting the ice particles.

In the pipeline cleaning system 10 of the present embodiment, the first layer 71 can remove the deposits 55 while ensuring the fluidity in the pipeline, and the second layer 72 removes the deposits adhering to the pipeline. 55 can be removed.

In addition, by injecting the first layer 71 with high fluidity into the section 16 to be cleaned at the beginning and end of the pressurized injection process of the fluid 12 and the solid particles 14, the first layer 71 having a high content of the solid particles 14 is injected. 2 layer 72 can be prevented from clogging the pipeline, and solid particles 14 can be suppressed from remaining in the pipeline. In order to improve this effect, only the fluid 12 (or only the first layer 71 in which the solid particles 14 are mixed) is filled into the section 16 to be cleaned at the beginning and/or the end of the pressure injection process. Intraline cleaning may be performed.

In this embodiment, the controller 45 is used to form the first and second layers 71 and 72. However, the fluid injection device 30 and the solid particle injection device 30 and the solid particle injection device are formed without installing the control device 45. The first layer 71 and the second layer 72 may be formed by adjusting the discharge rate from each of the layers 40 (eg, changing the discharge rate periodically). Further, the flow direction of the sewage 75 in the sewage pipe 60 and the moving direction of the fluid 12 and the solid particles 14 in the section 16 to be cleaned may be the same. Alternatively, the second layer 72 may be pressure-injected into the section 16 to be cleaned first, and then the first layer 71 may be pressure-injected.

The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the scope of the invention. For example, the pipeline cleaning system of the present invention can be applied not only to water supply pipelines and sewage pipelines, but also to various pipelines into which fluids and solid particles can be inserted.

In addition, the solid particles 14 are not limited to ice particles, but have a particle size larger than that of the sherbet-like fluid 12, and are smaller than the inner diameter of the channel to be cleaned so as not to impede fluidity significantly. For example, particles made of resin, metal, wood, or the like may be used. The specific gravity of the solid particles 14 is preferably the same as or slightly less than the specific gravity of the ice particles of the fluid 12, for example, about 0.9168, which is the specific gravity of the ice particles of the fluid 12 in the embodiment described above. In contrast, the preferred solid particles 14 have a specific gravity of about 0.8 to 1.0, with a more preferred specific gravity of about 0.85 to 0.95. By setting the specific gravity in this manner, the solid particles 14 can be mixed substantially uniformly in the fluid 12, and mixing of the first layer 71 and the second layer 72 in the section 16 to be cleaned can be suppressed. However, these can be moved to the downstream side of the section 16 to be cleaned.

Other examples of solid particles 14 can be rice husks and/or sawdust. Rice husks and sawdust can be impregnated with water and have a specific gravity slightly smaller than the specific gravity of the ice particles of the fluid 12 (for example, a specific gravity of 0.8 to 0.85), and are suitably used as cleaning materials. be able to. The average grain size (major diameter) of rice husks and sawdust is preferably about 10 to 60 mm, more preferably about 10 to 30 mm. In addition, the mixing ratio of husks and/or sawdust is preferably about 10 to 40% by volume, more preferably about 20 to 30% by volume. Since rice husks and large sawdust have sharp projections on their surfaces, the deposits 55 can be effectively scraped off by these projections during movement of the section 16 to be cleaned, and environmental pollution can be caused. and is economically superior. As the solid particles 14, the above ice particles may be used together with rice husks and/or sawdust. By using inexpensive rice husks and/or sawdust together with the fluid 12 as a cleaning material for the pipeline, the amount of the fluid 12 used can be reduced and the cost of the overall cleaning operation can be reduced.

In the above-described embodiment, the fluid 12 and the solid particles 14 are injected under pressure so as to fill the cross section of the pipeline in the section 16 to be cleaned. Then, the fluid 12 and the solid particles 14 may be flowed in a state in which there is a gap in the cross section of the pipe. In the above-described embodiment, both the upstream and downstream open ends of the section 16 to be cleaned are closed by the closing means. In some cases, only the upstream open end may be closed with a closing means, allowing the fluid 12 and solid particles 14 to be discharged from the downstream opening of the line to be cleaned.

10 pipe cleaning system 20 water main pipe 21 branch pipe (injection pipe)
22 branch pipe (discharge pipe)
24a, 24b water control valve (closing means)
30 Fluid Injector 40 Solid Particle Injector 50 Collection Tank 60 Sewer Pipe 64, 65 Cover (Closing Means)
67 injection pipe 68 discharge pipe

Claims (5)

In the pipeline cleaning method, a sherbet-like fluid containing water and ice particles is pressurized and injected into the cleaning target section of the pipeline to remove deposits in the pipeline,
a step of mixing solid particles larger in diameter than ice particles constituting the fluid into the fluid at a constant ratio to produce a mixture of the fluid and the solid particles;
and pressurizing and injecting the mixture into the section to be cleaned,
The ice particles constituting the fluid have an average particle size of 0.01 to 0.5 mm, and the content in the fluid is 70 to 95% of the total mass of the fluid,
The solid particles are ice particles with an average particle size of 10 to 60 mm,
The pipe cleaning method, wherein the mixing ratio of the solid particles in the mixture is 10 to 40% by volume. In the pipeline cleaning method, a sherbet-like fluid containing water and ice particles is pressurized and injected into the cleaning target section of the pipeline to remove deposits in the pipeline,
The fluid and solid particles larger in diameter than the ice particles constituting the fluid are injected into the injection pipe communicating with the cleaning target section, and the fluid is injected into the injection pipe. a step of alternately forming a first layer having a lower solid particle content and a second layer having a higher solid particle content than the first layer;
a step of pressurizing and injecting the first layer and the second layer into the section to be cleaned;
The ice particles constituting the fluid have an average particle size of 0.01 to 0.5 mm, and the content in the fluid is 70 to 95% of the total mass of the fluid,
The solid particles are ice particles with an average particle size of 10 to 60 mm,
A pipeline cleaning method, wherein the proportion of the fluid in the first layer is 70% by volume or more, and the proportion of the solid particles in the second layer is 50% by volume or more. 3. The pipe cleaning method according to claim 1 , wherein said solid particles contain salt. In a pipeline cleaning system for carrying out the pipeline cleaning method according to claim 1,
an injection pipe communicating between the section to be cleaned and the outside;
Closing means for closing an open end of the section to be cleaned located at least upstream of the injection pipe;
a fluid injection means for pressurizing and injecting the fluid into the section to be cleaned through the injection pipe;
solid particle injection means for injecting the solid particles having a larger diameter than the ice particles forming the fluid into the section to be cleaned through the injection pipe;
By operating the fluid injection means and the solid particle injection means, a mixture of the fluid and the solid particles is generated in the injection pipe, and the mixture is pressurized and injected into the section to be cleaned. A pipeline cleaning system characterized by: In a pipeline cleaning system for implementing the pipeline cleaning method according to claim 2 ,
the injection pipe communicating between the section to be cleaned and the outside;
Closing means for closing an open end of the section to be cleaned located at least upstream of the injection pipe;
a fluid injection means for pressurizing and injecting the fluid into the section to be cleaned through the injection pipe;
solid particle injection means for injecting the solid particles having a larger diameter than the ice particles forming the fluid into the section to be cleaned through the injection pipe;
By operating the fluid injection means and the solid particle injection means, the first layer and the second layer are alternately formed in the injection pipe, and the first layer and the second layer are formed. A pipeline cleaning system characterized by pressurizing and injecting a layer into the section to be cleaned.

Images