JP2010051885A - Pig cleaner and pig cleaning method of piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pig cleaner capable of surely cleaning the step part of a pipe and preventing cleaning liquid or the like inside the pipe being cleaned from flowing into a pipe other than a cleaning object, and a cleaning method. <P>SOLUTION: The pig cleaner includes a plurality of pigs 30 and 31 which are formed of a soft material, have a diameter larger than the inner diameter of the pipe to be the object of cleaning and are disposed in one line, and a net 32 which is integrally put on the plurality of pigs 30 and 31. Between the pigs 30 and 31, the cleaning liquid 33 is filled. By the effect of the plurality of soft pigs 30 and 31, the net 32 integrally put on them and the cleaning liquid 33 sandwiched between them, the pig cleaner 15 can be moved by vacuum suction and the cleaning liquid and dirty substances, etc., are prevented from flowing from the pipe being cleaned into the pipe other than the cleaning object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pig cleaning tool and a pipe cleaning method for piping.

For example, water supply pipes are generally configured in a net shape by main pipes having a pipe diameter of 50 mm or more and lead-in pipes having a pipe diameter of 15 to 25 mm connected to the main pipes for supplying water to each dwelling unit. is there. In such a net-like pipe, it is usual to clean internal stains of the main pipe and the lead-in pipe regularly or at an arbitrary time. In particular, in the case of a simple water supply or a dedicated water supply which is a relatively small-scale water supply, well water is often used, so that the pipe tends to become dirty and the frequency of cleaning tends to increase as described below.

That is, well water often contains iron, manganese, and the like derived from soil, and manganese is oxidized by a disinfectant chlorine and deposited as a dirt substance (black particles). This contaminated material is mixed in tap water and adheres to the pipe, drops off over time, and mixes in tap water. Therefore, it is necessary to clean and remove the dirt substance adhering to the tube periodically or at an arbitrary time.

Conventionally, as a technique for cleaning pipes such as tap water, a cleaning method for removing dirt by in-pipe injection of high-pressure water, and a cleaning method for removing dirt from a pipe wall by filling the pipe with a cleaning agent and bubbling with air are known. It was.

However, the conventional method of cleaning a tube with high-pressure water has a problem that it takes a very long time because a high-pressure water cleaning tube needs to be inserted into the tube and the high-pressure water must be uniformly sprayed over the entire surface of the tube. In addition, the cleaning method in which the cleaning liquid is filled in the tube and bubbled with air has a problem that the peeling effect by air bubbling is weak and it takes time to clean, and it is necessary to fill the entire tube with the cleaning solution. There was a problem of cost increase.

Therefore, a pig cleaning method that can clean the tube in a relatively short time and at a low cost has been proposed (for example, see Patent Document 1). In the pig cleaning method of Patent Document 1, as shown in FIG. 9, a pig cleaning tool 110 in which two front and rear pigs 100 and 101 sandwiching a cleaning liquid 104 are connected by a string 102 is inserted into a pipe 103, and this pig cleaning is performed. By moving the tool 110 with air pressure or nitrogen pressure, dirt adhered to the inner surface of the tube 103 is removed. There is also a method of moving the pig with water pressure.

In the pig cleaning method of Patent Document 1, since the pig cleaning tool inserted into the tube 103 is moved by air pressure or nitrogen pressure, even when the tube 103 is long, the pig cleaning tool is moved to the tip, so that the tip of the tube 103 is reached. Can be washed. In addition, since the pigs 100 and 101 come into contact with the inner surface of the tube 103, the effect of peeling off dirt substances and the like is high, and the tube 103 can be cleaned in a shorter time than a cleaning method in which the tube 103 is filled with the cleaning liquid 104 and bubbled. . Furthermore, since the cleaning liquid 104 may be filled between the front and rear pigs 100 and 101, the amount of the cleaning liquid can be reduced and the cost can be reduced.
JP 2006-95495 A JP 2008-119564 A

However, the conventional pig is formed of a flexible synthetic resin or rubber foam to ensure adhesion to the tube, and is formed of a relatively hard material having a foam density of 20 mg / cm ³ or more. Since the outer diameter of the pipe is about 1 to 1.05 times the inner diameter of the pipe, if there is a stepped part such as an elbow joint in the pipe, the pig should be sufficiently close to the corner of the stepped part. There was a problem in that the tube was not deformed until it adhered and the tube was not sufficiently cleaned.

In addition, when a large number of lead-in pipes are connected to the main pipe, such as water pipes, the pipes that are to be cleaned and the pipes that are not to be cleaned are separated by a water stop valve or gate valve, It is usual to prevent the cleaning liquid and dirt in the pipe being cleaned from flowing into the pipe. However, since the conventional pig has a high adhesion force to the tube wall, in order to move the pig within the tube, it has been necessary to pressurize it with an air pressure or a water pressure of about 0.3 MPa or more. For this reason, when the stoppage of the water stop valve or gate valve is insufficient and there is a gap, the cleaning liquid or dirt substance in the pipe being cleaned is pressed by the pressure air or the pressure water and is not cleaned from the clearance of the valve. There was a risk of flowing into the tube.

  The present invention has been made to solve such a conventional problem, and even when there is a step portion in the pipe, the pipe can be reliably washed, and the washing liquid in the pipe being washed flows into the pipe not to be washed. An object of the present invention is to provide a pig cleaning tool and a pipe cleaning method capable of suppressing the above.

The present invention employs the following means in order to solve the above problems.
That is, the present invention includes a plurality of spherical pigs formed of a soft material and having a diameter larger than the inner diameter of a tube to be cleaned and arranged in a row, and integrally formed with the plurality of pigs. And a net overlaid on.

  According to the present invention, since the pig is formed of a soft material, even if the pipe to be cleaned has a stepped portion such as a joint, the pig can be reliably cleaned by contacting the corner of the stepped portion. Further, since the pig has softness, when the pig contacts the inner surface of the pipe, the net is embedded inside from the outer peripheral surface of the pig, and the outer peripheral surface of the pig can contact the entire inner surface of the pipe for cleaning.

Here, the pig has a foaming density of 0.08 to 0.12 mg / cm ³ , preferably 0.1
It can be formed with a foam material of mg / cm ³ . The outer diameter of the pig is 1.05 of the inner diameter of the tube.
It is preferable to make it -1.1 times, preferably 1.08 times. It is preferable that the foam material is in a state in which open cells and closed cells are mixed and gas is not transmitted. By setting the foaming density and the outer diameter, the pig can be sucked in vacuum. Since the pig of the present invention has a lower adhesion to the tube wall than conventional pigs, the cleaning power of the pig alone is somewhat lower, but sufficient cleaning is possible by combining it with a cleaning solution.

Further, the pig cleaning tool of the present invention can move together with the cleaning liquid between the pigs by combining the plurality of pigs and the net to connect the front and rear pigs. Further, by covering the plurality of pigs with the net, it is possible to prevent the leakage of the cleaning liquid by suppressing the deformation of the pigs during the vacuum suction movement. When the conventional pig cleaning tool of Patent Document 1 is pulled by connecting the center of the pig with a string, the pig becomes flat in the case of a soft pig, but by covering the entire pig as in the present invention, Since it is possible to prevent the pig from becoming flat, it is possible to prevent the cleaning liquid from leaking and to prevent a reduction in the adhesion of the pig to the tube wall.

The present invention also includes a step of opening both ends of a pipe to be cleaned among the pipes constituting the pipe, a step of inserting any one of the above-described pig cleaning tools from the other end side of the pipe, Vacuuming the pig cleaning tool in the tube from the one end side of the tube and moving it to the one end side; and

According to the present invention, a pig cleaning tool formed of a soft material and having a net covered with a plurality of pigs having a diameter larger than the inner diameter of the pipe is inserted into the pipe, and the pig cleaning tool is moved by vacuum suction. The pressure does not act on the cleaning liquid and dirt in the pipe. Therefore, even when there is a gap in the valve provided between the pipe to be cleaned and the pipe not to be cleaned, it is possible to prevent the cleaning liquid, the dirt substance, and the like in the pipe being cleaned from flowing into the pipe not to be cleaned.

Here, in the step of moving the pig cleaning tool, the moving speed of the pig cleaning tool can be adjusted by pulling the pig cleaning tool from the other end side of the tube. In this case, since the moving speed of the pig cleaning tool can be adjusted according to the inner diameter of the pipe, the diameter of the pig, the characteristics of the cleaning liquid or the dirt substance peeled off the pipe, the cleaning effect can be enhanced.

Moreover, the moving speed of the pig cleaning tool can be adjusted by pulling the pig cleaning tool with a rope fed from the winding device and adjusting the feeding speed of the rope in the winding device. In this case, the moving speed of the pig cleaning tool can be automatically adjusted.

Furthermore, the said pig cleaning tool can be pressed with compressed air from the said other end part side of the said pipe | tube. In this case, the pig washer is vacuum-sucked from the front and pressed with compressed air from the rear, so that the pig washer can be reliably moved even when the resistance to movement of the pig washer is large, such as a small-diameter tube. be able to.

In addition, a cleaning liquid can be filled between the plurality of spherical pigs. In this case, the cleaning efficiency can be further increased.

  According to the present invention, even when the pipe has a stepped portion, it can be reliably washed. Further, even when there is a gap in the valve provided at the connection portion between the pipe to be cleaned and the pipe not to be cleaned, it is possible to suppress the cleaning liquid in the pipe being cleaned from flowing into the pipe not to be cleaned.

  Next, the pig cleaning method for piping according to the present invention will be described in detail with reference to the drawings. This embodiment is an example, and the present invention is not limited to the embodiment.

<Piping configuration>
FIG. 1 shows a pipe 1 to which a pipe pig cleaning method according to the present invention is applied. The pipe 1 includes a main pipe 10, a branch pipe 11 branched from the main pipe 10, a main pipe 10 or a lead-in pipe 12 provided in the branch pipe 11, a gate valve 13 provided in the main pipe 10 or the branch pipe 11, a lead-in The water stop valve 14 provided in the pipe | tube 12 and the water meter 19 which measures the amount of flowing water of the drawing-in pipe | tube 12 are provided. In this embodiment, the nominal diameter of the main pipe 10 and the branch pipe 11 is 100A, and the nominal diameter of the lead-in pipe 12 is 20A. The main pipe 10, the branch pipe 11, and the lead-in pipe 12 are made of hard vinyl chloride.

The branch pipe 11 is connected to the main pipe 10 and has a plurality of first branch pipes 11a arranged at intervals.
And a second branch pipe 11b connecting the tip of the first branch pipe 11a. A plurality of lead-in pipes 12 are provided in the main pipe 10 or the first and second branch pipes 11a and 11b, respectively. These lead-in pipes 12 are drawn into, for example, a house. In the present embodiment, the case where the second branch pipe 11b and the lead-in pipe 12 of the pipe 1 are cleaned will be described.

<Pig cleaning tool configuration>
FIG. 2 shows a pig cleaning tool 15 according to an embodiment of the present invention. The pig cleaning tool 15 has two elastic and soft spherical pigs 30 and 31 arranged in a row at an appropriate interval, and the pigs 30 and 31 are covered with a resin net 32. Yes. This pig cleaning tool 15
When the piping is cleaned using the cleaning liquid 33, the cleaning liquid 33 is filled between the pigs 30 and 31. Three or more pigs can be used. Further, in the following description, the pig 30 at the front with respect to the direction X in which the pig cleaning tool 15 moves when the pipe is cleaned is referred to as a guide pig, and the pig 31 at the rear is referred to as a cover pig.

In this embodiment, each pig 30 and 31 are formed by the polyurethane, the foam density 0.08~0.12mg / cm ^3, preferably is set to 0.1 mg / cm ^3. Here, the relationship between the foam density of each pig 30 and 31 and the passage situation of piping was calculated | required by experiment. FIG. 3 shows the experimental apparatus 40. The experimental apparatus 40 includes a pipe 42 having two elbow joints 41 and a pig cleaning tool 15 inserted into the pipe 42.

The material of the tube 42 is impact resistant hard vinyl chloride tube (HIVP), nominal diameter 50A, tube length is 25m
, 90 degree elbow joints 41 are provided at two locations on the pipe 42. The guide pig 30 and the cover pig 31 have a spherical shape, the foaming condition is an open cell + closed cell, the diameter is 55 mm, and the distance between the guide pig 30 and the cover pig 31 is 2 m. As is well known, the closed cell body refers to those in which bubbles are present inside but are not connected because the bubbles are partitioned by a wall. An open-cell body means what bubbles are connected to.

In the experiment, the pig cleaning tool 15 is inserted from one end 42a of the pipe 42, and the other end 42b of the pipe 42 is inserted.
Then, the degree of vacuum and the movement time when the pig cleaning tool 15 was moved to the other end 42b side by vacuum suction were measured, and the movement status of the pig cleaning tool 15 and the leakage status of the cleaning liquid 33 were observed.

FIG. 4 shows the experimental results. As can be seen from the experimental results, when the foam density of the pigs 30 and 31 is too low (Experiment No. 1), the cleaning liquid 33 filled between the pigs 30 and 31 may leak forward from the guide pig 30. is there. If the foam density is too high (Experiment Nos. 3 and 4), the pig cleaning tool 15 may not pass through the elbow joint 41 smoothly.

When the foaming density is set appropriately (Experiment No. 2), the pig cleaning tool 15 smoothly passes through the elbow joint 41, and the cleaning liquid 33 does not leak. From this experimental result, the foaming density of each of the pigs 30 and 31 is determined as Experiment NO. It can be seen that it is preferably set to around 0.1 mg / cm ³ as in 2. Therefore, in this embodiment, the foam density 0.08~0.12mg / cm ³ of the pig 30 and 31, preferably set to 0.1 mg / cm ^3.

Further, the outer diameters of the guide pig 30 and the cover pig 31 are set to be slightly larger than the inner diameter of the pipe to be cleaned. In the present embodiment, the outer diameter of each of the pigs 30 and 31 is 1.05 to 1.1 times, preferably 1.08 times the inner diameter of the pipe to be cleaned. Since the pigs 30 and 31 are soft, when the pigs 30 and 31 having a diameter larger than the inner diameter of the tube are inserted into the tube, the net 32 is pushed into the outer peripheral surface of the pigs 30 and 31 by the inner surface of the tube. As a result, the outer peripheral surface of each of the pigs 30 and 31 comes into full contact with the inner peripheral surface of the pipe, and a scrubbing effect is produced.

The net 32 can be a packaging net formed in a cylindrical shape by a resin extrusion molding method. The material of the net 32 is made of polyethylene, and the wire diameter is 0.1 to 0.2 mm. The number of stitches of the net 32 is 70 to 100, and the folding diameter is 20 to 60%, preferably 40% of the outer diameter of each of the pigs 30 and 31. Since each of the pigs 30 and 31 is soft, the net 32 is embedded in the outer peripheral surface of each of the pigs 30 and 31 just by covering the net 32 with the pigs 30 and 31. Therefore, it is not necessary to provide a groove or the like on the outer peripheral surface of each pig 30 or 31 and insert the net 32 into the groove or the like, so that the number of processing steps for each pig 30 or 31 can be reduced.

Further, since the front guide pig 30 in the pig cleaning tool 15 is moved by being sucked by vacuum, the net 32, the cleaning liquid 33 and the cover pig 31 move integrally, so that the distance between the guide pig 30 and the cover pig 31 is always kept constant. Is done. Accordingly, the cleaning liquid 33 filled between the guide pig 30 and the cover pig 31 is not pressed by the pigs 30, 31 and there is no gap between the pigs 30, 31 and the pipe. Leakage to the outside of the cleaning tool 15 can be suppressed. The vacuum pressure (negative pressure) for moving the pig cleaning tool 15 is set to -0.01 to -0.075 MPa or less, desirably -0.01 to -0.04 MPa.

Moreover, since the net 32 is formed in a cylindrical shape by an extrusion molding method,
The net 32 has elasticity in the circumferential direction but has almost no elasticity in the axial direction. Therefore, even if a vacuum suction force is applied to each of the pigs 30 and 31, the distance between the pigs 30 and 31 does not change, so that the cleaning liquid 33 is filled between the pigs 30 and 31 even when the pig cleaning tool 15 moves. Is maintained. Further, since the pigs 30 and 31 are soft, the pigs 30 and 31 reliably come into contact with a stepped portion such as a joint, which is difficult to contact with the conventional hard pigs 100 and 101, and the cleaning liquid 33 is washed. Combined with the effect, the stepped portion can be cleaned with high quality.

The filling amount of the cleaning liquid 33 can be about 10% of the entire length of the pipe to be cleaned when the dirt substance in the pipe is manganese. As a result, the amount of the cleaning liquid used can be greatly reduced as compared with the conventional case where the cleaning liquid is filled in the tube and bubbled, so that the cost can be reduced.

When cleaning a pipe member having a pipe diameter of 50 A or more, the guide pig 30 of the pig cleaning tool 15 is used.
The cover 32 is covered with the net 32. However, when cleaning a pipe member having a pipe diameter smaller than 50A, it is preferable that the guide pig 30 and the cover pig 31 are not covered with a net or connected with a string.

<How to wash the branch pipe>
Next, the case where the 2nd branch pipe 11b (refer FIG. 1) of the piping 1 is cleaned using the pig cleaning tool 15 is demonstrated with reference to FIG.5 and FIG.6.

Here, first, as shown in FIG. 5, the arbitrary pipe | tube used as washing | cleaning object, the both ends A and B of the 2nd branch pipe 11b in this embodiment are open | released. Here, both ends A and B of the second branch pipe 11b are opened by cutting the vicinity of both ends A and B of the second branch pipe 11b at appropriate positions. At this time, of the gate valve 13 of the first branch pipe 11b connected to the second branch pipe 11b, the gate valve 13 closer to the second branch pipe 11b and the lead-in pipe connected to the second branch pipe 11b. The water stop valve 14 closer to the second branch pipe 11b among the 12 water stop valves 14 is closed. Thereby, it is possible to prevent the cleaning liquid or the dirt substance in the second branch pipe 11b from flowing into the first branch pipe 11a or the tip of the water stop valve 14 of the lead-in pipe 12 during the cleaning of the second branch pipe 11b.

Next, as shown in FIG. 6, the suction port 20a of the vacuum suction wheel 20 is connected to the one end A of the second branch pipe 11b through the pipe 16, the pig catcher 17 that receives the pig cleaning tool 15, and the suction hose 18. To do. As the pig catcher 17, a container having a volume capable of accommodating the pig cleaning tool 15 can be used.

Next, the inside of the 2nd branch pipe 11b is vacuum-sucked with the vacuum suction wheel 20, and the pig washing tool 15 is inserted in the 2nd branch pipe 11b from the other end B of the 2nd branch pipe 11b. At this time, the rope 22 fed out from the winding device 21 is attached to the rear end of the net 32 in the pig cleaning tool 15.

Further, when the pig cleaning tool 15 is inserted into the second branch pipe 11 b, the cleaning liquid 33 is injected and filled between the guide pig 30 and the cover pig 31. The cleaning liquid 33 is preferably a detergent mainly composed of an organic acid, for example, a product conforming to JIS K3370 (1979) “Kitchen Synthetic Detergent” when the dirt substance in the second branch pipe 11b is manganese dirt.

Next, the rope 22 is unwound from the winding device 21, and the pig cleaning tool 15 is moved in the X direction by vacuum suction. When the pig cleaning tool 15 is moved, the vacuum pressure in the second branch pipe 11b is maintained at about −0.04 Mpa, the feeding speed of the rope 22 by the winding device 21 is adjusted, and the moving speed of the pig cleaning tool 15 is increased. adjust. The moving speed of the pig cleaning tool 15 is appropriately set according to the inner diameter of the second branch pipe 11b, the characteristics of the dirt substance, the cleaning liquid, and the like.

According to the present embodiment, the pig cleaning tool 15 in which the plurality of pigs 30 and 31 having elasticity and softness and a diameter larger than the inner diameter of the second branch pipe 11b are covered with the net 32 is disposed in the second branch pipe 11b. Since the second branch pipe 11b is long, the pig cleaning tool 15 can be moved over the entire second branch pipe 11b. Thereby, even when the 2nd branch pipe 11b is long, it can wash | clean reliably to the front-end | tip of the 2nd branch pipe 11b.

Further, since pressure does not act on the cleaning liquid 33 in the second branch pipe 11b being cleaned or the dirt substance peeled off from the pipe wall, the connecting portion between the second branch pipe 11b and the first branch pipe 11a not to be cleaned, Alternatively, even when there is a gap in the gate valve 13 or the water stop valve 14 provided at the connection portion between the second branch pipe 11b and the lead-in pipe 12, the cleaning liquid 33 and the dirt substance in the second branch pipe 11b are washed away. It can prevent flowing into the tip of the water stop valve 14 of the 1st branch pipe 11a or the draw-in pipe 12 which is not object.

Further, the moving speed of the pig cleaning tool 15 can be automatically adjusted by pulling the pig cleaning tool 15 with the rope 22 fed out from the winding device 21 and adjusting the feeding speed of the rope 22 in the winding device 21. Moreover, since the moving speed of the pig cleaning tool 15 can be adjusted according to the characteristics of the inner diameter of the second branch pipe 11b, the cleaning liquid 33, the dirt substance peeled off from the second branch pipe 11b, etc., the cleaning effect can be enhanced.

Further, when cleaning the pipe such as the second branch pipe 11b by filling the pig cleaning tool 15 with the cleaning liquid 33, the time for which the cleaning liquid 33 is in contact with the inner surface of the pipe is made as constant as possible in order to prevent uneven cleaning. There is a need to.

However, when the second branch pipe 11b is provided with an elbow joint or the like, when the pig cleaning tool 15 enters the joint portion of the pipe or when the pig cleaning tool 15 enters the straight portion from the stepped portion. The resistance against movement of the pig cleaning tool 15 changes abruptly, and its moving speed changes abruptly. Therefore, it is difficult to move the pig cleaning tool 15 at a constant speed by vacuum suction.

Therefore, in the present embodiment, as shown in FIG. 7, the rope 22 is attached to the rear end of the net 33 of the pig cleaning tool 15, and the winding speed of the rope 22 is made constant by the winding device 21, thereby The moving speed of 15 can be made constant. Therefore, it is possible to suppress the occurrence of uneven cleaning in the second branch pipe 11b.

Further, since the cleaning liquid 33 only needs to be filled between the guide pig 30 and the cover pig 31 of the pig cleaning tool 15, the cleaning liquid 33 is compared with the conventional cleaning method in which the entire piping to be cleaned is filled with the cleaning liquid and air bubbled. 33 can be greatly reduced, which enables cost reduction. Although depending on the length of the tube to be cleaned, the amount of the cleaning liquid 33 was reduced to about 10% in the experiment compared to the conventional case.

<How to clean the lead-in pipe>
Next, the case where the drawing pipe | tube 12 connected to the 2nd branch pipe 11b is wash | cleaned using the pig cleaning tool 50 is demonstrated. In this case, since the nominal diameter of the lead-in pipe 12 is as small as 20A, the resistance acting from the lead-in pipe 12 when the pig cleaning tool 50 is moved increases. Therefore, in this case, as shown in FIG. 8, the guide pig 30 and the cover pig 31 of the pig cleaning tool 50 are not covered with a net, and the guide pig 30 and the cover pig 31 are not connected with a string. A cleaning liquid 33 is filled between the guide pig 30 and the cover pig 31.

In this case, as will be described below, the pig cleaning tool 50 is vacuum-sucked from the one end A side of the second branch pipe 11b to which the lead-in pipe 12 is connected and from the one end C side of the lead-in pipe 12 By pressing with pressurized air, the pig cleaning tool 50 can be reliably moved.

That is, when cleaning the lead-in pipe 12 with the pig cleaning tool 50, first, as shown in FIG. 7, the pipes 16 and 18 and the pig catcher are connected to one end A of the second branch pipe 11b as in the first embodiment. 17 and the vacuum suction wheel 20 are connected. Further, the water stop valve 14 is removed from one end C of the lead-in pipe 12, and the one end C is opened. Then, the pig cleaning tool 50 is inserted from one end C of the lead-in pipe 12, and an air compressor 24 such as a baby compressor is connected to the one end C via the pipe 23.

Next, the vacuum suction wheel 20 and the air compressor 24 such as a baby compressor are driven to move the pig cleaning tool 50 in the drawing tube 12. Here, the pig cleaning tool 50 is moved to the pig catcher 17. At this time, the vacuum pressure of the vacuum suction wheel 20 is set to about -0.04 MPa, and the air pressure of the air compressor 24 is set to about 0.01 MPa. Thereby, the drawing-in pipe | tube 12 can be reliably wash | cleaned from the one end C to the connection part (other end) with the 2nd branch pipe 11b.

According to the present invention, the pig cleaning tool 50 is inserted into the small-diameter pull-in pipe 12, and the pig cleaning tool 50 is vacuum-sucked from one end of the pull-in pipe 12 and pressed with compressed air from the other end. Even if the nominal diameter of 12 is a small diameter of about 15A to 25A, the retractable pipe 12 can be reliably cleaned in a relatively short time by reliably moving the pig cleaning tool 50.

It is a figure which shows piping used as the washing | cleaning object which concerns on embodiment. It is a figure which shows the pig cleaning tool which concerns on embodiment. It is a figure which shows the experimental apparatus which calculates | requires the optimal density of the pig which concerns on embodiment of this invention. It is a figure which shows the experimental result which calculates | requires the optimal density of the pig which concerns on embodiment of this invention. It is a figure which shows the state which open | released the both ends of the 2nd branch pipe used as the washing object which concerns on embodiment. It is a figure explaining the washing | cleaning method of the 2nd branch pipe used as the washing object which concerns on embodiment. It is a figure which shows the washing | cleaning method of the lead-in pipe used as the washing | cleaning object which concerns on embodiment. It is a figure which shows another pig cleaning tool which concerns on embodiment. It is a figure which shows the pig cleaning tool which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe 10 Main pipe 11 Branch pipe 11a 1st branch pipe 11b 2nd branch pipe 12 Pull-in pipe 13 Gate valve 14 Water stop valve 15 Pig washing tool 16 Pipe 17 Pig catcher 18 Suction hose 19 Metered water device 20 Vacuum suction wheel 20a Suction Mouth 21 Winding device 22 Rope 23 Piping 24 Air compressor 30 Guide pig 31 Cover pig 32 Net 33 Cleaning liquid 40 Experimental equipment for measuring the optimum foaming density of pig 41 Joint 42 Piping 50 Pig cleaning tool 100, 101 Pig 102 Connecting means 103 Piping 104 Cleaning solution 110 Pig cleaning tool

Claims (9)

It is made of a soft material and has a diameter larger than the inner diameter of the tube to be cleaned,
And a plurality of spherical pigs arranged in a row;
A net integrally covered with the plurality of pigs;
Pig cleaning tool with. The pig cleaning tool according to claim 1, wherein the pig is formed of a foam material having a foam density of 0.08 to 0.12 mg / cm ³ . The pig cleaning tool according to claim 2, wherein the foam density of the foam material is 0.1 mg / cm ³ .   The outer diameter of the said pig is 1.05-1.1 times the internal diameter of the said pipe | tube, The pig cleaning tool as described in any one of Claim 1 to 3.   The pig cleaning tool according to claim 4, wherein the outer diameter of the pig is 1.08 times the inner diameter of the pipe. A step of opening both ends of the pipe to be cleaned among the pipes constituting the pipe;
Inserting the pig cleaning tool according to any one of claims 1 to 5 from the other end side of the tube;
Moving the pig cleaning tool in the tube to the one end side by vacuum suction from the one end side of the tube;
Pig cleaning method for piping comprising The pipe cleaning method according to claim 6, wherein in the step of moving the pig cleaning tool, the moving speed of the pig cleaning tool is adjusted by pulling the pig cleaning tool from the other end side of the pipe.   In the step of moving the pig cleaning tool, the moving speed of the pig cleaning tool is adjusted by pulling the pig cleaning tool with a rope fed out from the winding device and adjusting the feeding speed of the rope in the winding device. The pipe pig cleaning method according to claim 7.   The pig cleaning method according to any one of claims 6 to 8, wherein a cleaning liquid is filled between the plurality of spherical pigs.

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