JP2015081422A - Device and method for washing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for washing a pipe, capable of preventing ejection of contaminated air to the outside of the pipe, and capable of avoiding adhesion of a residue or stains such as oils and fats on a hose pulled out of piping.SOLUTION: In a pipe washing device 1, a main nozzle N connected to a downstream side end of a hose 5 to which washing liquid is supplied is arranged in piping 15, and high pressure ejection of the washing liquid is carried out while moving the main nozzle, so that the inside of the pipe is washed. A sub nozzle unit 7 is disposed on the upstream side of the main nozzle in the piping so as to eject the washing liquid toward the downstream side, and the hose in the piping is washed by the washing liquid ejected from the sub nozzle unit, and air in the piping is shielded.

Description

  The present invention relates to a pipe cleaning apparatus and a pipe cleaning method, and more particularly to a pipe cleaning apparatus and a pipe cleaning method for cleaning indoor drainage piping using high-pressure cleaning water sprayed from a nozzle.

For example, domestic wastewater (sewage) discharged from high-rise building apartments can be transferred from a dedicated water pipe installed in an individual house to an external horizontal pipe through a common vertical pipe installed inside the building. It is configured to be discharged so that a good living environment is maintained.
By the way, since this domestic wastewater (sewage) contains a large amount of residue, oil and fat, etc., not only the above-mentioned dedicated drainage pipe but also the solid wall on the pipe wall of the common drainage pipe (the vertical pipe and the horizontal pipe). May adhere and block the drainage pipe after a considerable period of time. Moreover, a bad odor is emitted from this solid substance, and the living environment may be deteriorated. In order to prevent such deterioration of the living environment and maintain a favorable living environment, it is necessary to clean the dedicated drain pipe and the common drain pipe at regular intervals.

  Conventionally, a high-pressure water jet cleaning method (hereinafter referred to as a high-pressure cleaning method) has been adopted as one means for cleaning (removing) the solid matter adhering to the drainage pipe. In this high-pressure cleaning method, high-pressure water is ejected from a nozzle attached to the tip of a hose toward a solid matter attached to the drain pipe to remove the solid matter.

  FIG. 9 and FIG. 10 schematically show an example of the state of installation of drain pipes in an apartment house in a high-rise building format and an example of work of the high-pressure cleaning method. That is, A, B, and C shown in FIG. 9 indicate individual premises on each floor, and domestic wastewater from each kitchen, washroom, washing pan, and bathroom is in the lower floor portion of each premises. They are discharged to the exclusive drain pipes 14a, 14b, 14c laid in the horizontal direction, and these are gathered in the common vertical pipe 15 laid in the vertical direction in the building (apartment house) and flowed to the external horizontal pipe 16 It is.

  In the state where the drainage pipe is laid, generally, a method of cleaning separately from the common drainage pipe including the vertical pipe 15 and the horizontal pulling pipe 16 and the dedicated drainage pipes 14a, 14b and 14c in the individual house is adopted. Is done.

  When cleaning the vertical pipe 15, there are a case where the work is performed from the lower end side of the vertical pipe 15 and a case where the work is performed from the upper end side. For example, when the work is performed from the upper end side of the vertical pipe 15, as shown in FIG. 9, the cleaning work is performed using the cleaning opening 15a near the rooftop or the cleaning opening 23 near the top floor. The example shown in FIG. 9 shows a cleaning method called downward cleaning, and the worker P inserts the nozzle N into the standing pipe 15 from the cleaning port 23 near the top floor and puts the hose H in a state where high pressure water is not jetted. Feed out and insert the nozzle N at the tip to the lowest floor. In this state, the inside of the common drain pipe (stand pipe 15) can be cleaned by pulling up the hose H while jetting high-pressure water from the nozzle N.

  In the downward cleaning shown in FIG. 9, it is desirable that the injection direction of the high-pressure water in the nozzle N is configured in a direction orthogonal to the advance / retreat direction of the nozzle (so as to inject in the circumferential direction of the nozzle). As a result, when the nozzle N is pulled up, it is possible to reduce the nozzle pulling resistance generated by the injection of high-pressure water.

  On the other hand, FIG. 10 illustrates a cleaning method for a dedicated drain pipe. In the example shown in FIG. 10, the state of cleaning the exclusive drain pipe 14a in the house A is shown, and cleaning is performed by inserting nozzles N from four drain outlets in the kitchen, washroom, washing pan, and bathroom. Done. In this case, the nozzle H is used to inject high-pressure water obliquely backward.

  As a result, cleaning is performed up to the joining portion of the standpipe 15 using the forward thrust of the nozzle. And when the nozzle N advances to the confluence | merging part of the standing pipe 15, injection of spray water is stopped and a hose is pulled out.

Although it is possible to increase the cleaning efficiency in the pipe by spraying water when pulling out the hose, a large resistance is generated at the bent part of the drain pipe due to the forward thrust of the nozzle, and the hose is pulled out. It is significant to avoid damaging the bent part in the pipe. And the washing method of the above-mentioned exclusive drain pipe is performed similarly in the house in each floor.
In addition, about the washing | cleaning of piping using the above-mentioned high-pressure washing | cleaning method, it is disclosed by patent document 1, etc., for example.

JP 2003-184151 A

By the way, in the drainage pipe as described above, the inside thereof is close to the sealed space, and the pressure inside the pipe may be higher than the outside of the pipe. In such a case, when the high pressure cleaning method is performed, when the cleaning opening 15a or the cover of the cleaning port 23 is opened, the dirty air in the pipe is blown out of the pipe, and the dirty air is discharged even during the work. There was a problem of continuing to flow out of the tube.
Also, in the cleaning method of the dedicated drain pipe as described with reference to FIG. 10, the hose H is inserted into the pipe from the drain outlet, so that the drain outlet and the pipe are in a vented state, and the air that has become dirty inside the work during the work There was a problem of erupting.
In addition, as described with reference to FIG. 9, for example, when the vertical pipe (common drainage pipe) is washed downward, the hose H is fed out without jetting high-pressure water, and the nozzle N at the tip is moved to the lowest floor. In this state, the inside of the pipe is cleaned by pulling up the hose H while jetting high-pressure water from the nozzle N.
However, in that case, since the hose H to be pulled up is pulled up in the unwashed pipe, there is a problem that a large amount of residue and dirt such as oils and fats are pulled up together with the hose H.
Further, in the dedicated drain pipe cleaning method shown in FIG. 10, when the hose H is pulled up and collected, there is a problem that dirt is attached to the collected hose H.

  The present invention has been made paying attention to the above-described points, and a nozzle connected to a hose to which a cleaning liquid is supplied is arranged in the pipe, and the high pressure injection of the cleaning liquid is performed while moving the nozzle. The present invention provides a pipe cleaning apparatus and a pipe cleaning method that prevent the outflow of dirty air from the inside of a pipe and prevents dirt such as residue and oil from adhering to a hose pulled up from the pipe. For the purpose.

In order to solve the above-described problem, a pipe cleaning apparatus according to the present invention has a main nozzle connected to a downstream end of a hose to which a cleaning liquid is supplied in a pipe, and the cleaning liquid is moved while moving the main nozzle. A pipe cleaning device that cleans the inside of a pipe by performing high-pressure injection, and is provided upstream of the main nozzle in the pipe, and includes a sub-nozzle unit that injects the cleaning liquid toward the downstream side, and is injected from the sub-nozzle unit. The washed liquid is characterized in that the hose in the pipe is washed and the air in the pipe is shielded.
The sub-nozzle unit has a plurality of sub-nozzles for injecting the cleaning liquid, respectively, and the plurality of sub-nozzles are arranged so as to surround the hose connected to the main nozzle, and each of the sub-nozzle units injects the hose. Is desirable.
In addition, it is desirable that the sub nozzle unit jets the cleaning liquid in a mist form.

With this configuration, not only cleaning that removes dirt such as fats and oils and residues from the inside of the pipe can be performed, but also the injection region is brought into a negative pressure state by injecting the cleaning liquid from the sub nozzle unit toward the downstream side. This is shielded by the cleaning liquid sprayed from the sub-nozzle unit. As a result, the dirty air in the pipe is blocked, and the dirty air can be prevented from flowing out of the pipe.
Further, since the cleaning liquid sprayed from the sub-nozzle unit always hits the hose in the pipe while the hose is pulled up, the hose and the nozzle can be collected in a state where the dirt adhering to the hose is washed away.

The sub-nozzle unit further includes a cylindrical member surrounding the plurality of sub-nozzles, and a top plate portion provided at one end of the cylindrical member in the axial direction. The top plate portion includes the main nozzle. It is desirable that an insertion hole for inserting the hose connected to is formed.
Since the position of the hose in the sub nozzle unit can be fixed by inserting the hose through the insertion hole of the top plate portion in this way, the cleaning liquid sprayed from the sub nozzle unit can be reliably applied to the hose.
The sub-nozzle unit preferably has an attachment member that allows the cylindrical member to be attached to the connection port to the pipe by expanding the diameter from the outer peripheral surface of the cylindrical member into a flange shape. The sub-nozzle unit can be easily attached to the drain outlet or the like.

  Further, in order to solve the above-described problem, the pipe cleaning method according to the present invention includes a main nozzle connected to the downstream end of the hose to which the cleaning liquid is supplied, arranged in the pipe, and moving the main nozzle. A pipe cleaning method for cleaning the inside of a pipe by performing high-pressure injection of a cleaning liquid, the step of disposing a sub nozzle in the pipe, starting injection of the cleaning liquid toward the downstream side, and shielding the air in the pipe, And a step of inserting and pulling up the main nozzle to a predetermined position downstream of the sub-nozzle in the pipe, and in the step of inserting and pulling up the main nozzle into the pipe, cleaning liquid is sprayed from the main nozzle to clean the inside of the pipe At the same time, the outer peripheral surface of the hose is washed with a washing liquid sprayed from the sub nozzle.

According to such a method, not only cleaning that removes dirt such as fats and oils and residues from the inside of the pipe can be performed, but also the cleaning area is sprayed from the sub nozzle unit toward the downstream side, so that the injection region becomes a negative pressure state. This is shielded by the cleaning liquid sprayed from the sub-nozzle unit. As a result, the dirty air in the pipe is blocked, and the dirty air can be prevented from flowing out of the pipe.
Further, since the cleaning liquid sprayed from the sub-nozzle unit always hits the hose in the pipe while the hose is pulled up, the hose and the nozzle can be collected in a state where the dirt adhering to the hose is washed away.

  According to the present invention, in a pipe cleaning apparatus for disposing a nozzle connected to a hose to which a cleaning liquid is supplied in a pipe and cleaning the inside of the pipe by performing high-pressure injection of the cleaning liquid while moving the nozzle, Thus, it is possible to obtain a pipe cleaning device and a pipe cleaning method in which dirt, such as residue and oil, does not adhere to the hose pulled up from the pipe.

FIG. 1 is a block diagram schematically showing the overall configuration of an embodiment of a tube cleaning apparatus according to the present invention. FIG. 2 is a perspective view showing a state in which the mist nozzle unit provided in the pipe cleaning device of FIG. 1 is arranged in the pipe from the cleaning opening of the vertical pipe. FIG. 3 is a perspective view showing a state in which the cleaning liquid is ejected from the mist nozzle unit of FIG. FIG. 4 is a perspective view of a modified example of the mist nozzle unit as viewed from above. FIG. 5 is a perspective view of a modified example of the mist nozzle unit viewed from below. FIG. 6 is a perspective view showing a state in which the mist nozzle unit of FIGS. 4 and 5 is arranged, for example, at a drainage port of a kitchen. FIG. 7 is a perspective view showing a state in which a pipe member is attached to the mist nozzle unit of FIGS. 4 and 5. FIG. 8 is a perspective view showing a state in which the mist nozzle unit to which the pipe member of FIG. 7 is attached is attached to the drain outlet on the side surface in the bathtub. FIG. 9 is a schematic diagram for explaining an example of a conventional downward cleaning method for a common drain pipe. FIG. 10 is a schematic diagram for explaining an example of a cleaning method for a dedicated drain pipe.

  Embodiments of a tube cleaning apparatus and a tube cleaning method according to the present invention will be described below with reference to the drawings. In addition, the pipe cleaning apparatus of the present invention is, for example, in a high-rise building type apartment house, oil or residue adhering to the inside of a common vertical pipe provided in the building or a dedicated water pipe installed in an individual house. It is used to wash away solids such as

  FIG. 1 is a block diagram schematically showing the overall configuration of an embodiment of a pipe cleaning apparatus according to the present invention, and shows a downward cleaning method for cleaning the interior of a vertical pipe that is a common drain pipe from the lower floor to the upper layer side. The structure when performing is shown. That is, the pipe cleaning apparatus 1 feeds the nozzle N for high-pressure jet cleaning into the pipe from the cleaning opening 15a provided on the side surface of the vertical pipe 15, and inserts the nozzle N to the lowest floor without jetting high-pressure water. In this state, the inside of the pipe is cleaned by pulling up high-pressure water while being jetted from the nozzle N.

  As shown in the drawing, the pipe cleaning device 1 includes a first hose 2 to which a cleaning liquid (for example, weakly acidic hypochlorous acid water) is supplied from a pump (not shown), and a tip of the first hose 2. And a branching member 3 that branches the flow path in two directions. Two terminals branched from the branch member 3 are connected to valves 10 and 11 for flow rate control. One valve 10 is connected to a second hose 5 connected to the nozzle N (main nozzle) for pipe cleaning at the downstream end, and the other valve 11 is further connected to a mist valve 12. The third hose 6 is connected.

  A mist nozzle unit comprising a plurality of mist nozzles (sub-nozzles) for spraying the cleaning water output from the mist valve 12 in the form of a mist (hereinafter also referred to as spray) at the tip of the third hose 6. 7 (sub-nozzle unit) is provided, and a pressure gauge 13 for checking the output pressure of the mist valve 12 is provided in the middle of the third hose 6.

  In addition, a sheath tube 8 having a predetermined length is disposed across the cleaning opening 15a of the standing tube 15, and the second hose 5 is inserted in the sheath tube 8 so as to be movable in the axial direction. The Accordingly, the second hose 5 is not bent at the edge of the cleaning opening 15 a, and the second hose 5 can be taken in and out of the vertical pipe 15.

Further, as shown in FIG. 2, a mist nozzle unit 7 is inserted into the pipe through the cleaning opening 15a of the standing pipe 15, and this mist nozzle unit 7 has an opening 15b of the standing pipe 15 provided in the cleaning opening 15a. It is locked to.
The mist nozzle unit 7 has three mist nozzles 7a, 7b, and 7c provided via a connecting member 7d connected to the tip of the third hose 6. As shown in FIGS. 2 and 3, the connecting member 7 d can be locked to the opening 15 b of the standing pipe 15 by extending three nozzle pipes in a leg shape. Three mist nozzles 7a, 7b, and 7c are provided at the lower ends of the three nozzle pipes of the connecting member 7d locked to the opening 15b. As shown in FIG. 3, each mist nozzle 7 a, 7 b, 7 c sprays the cleaning liquid in the form of a mist toward the downstream side in the pipe, and the injection direction is such that the sprayed cleaning liquid collides on the central axis of the vertical pipe 15. It has been adjusted.

More specifically, the mist nozzles 7a, 7b, 7c are arranged so as to surround the second hose 5 connected to the nozzle N in the vertical pipe 15, and FIG. As shown in FIG. 4, the cleaning liquid sprayed from the mist nozzles 7a, 7b, 7c at the predetermined height position in the pipe hits the entire outer peripheral surface of the second hose 5.
2 and 3, the second hose 5 and the sheath tube 8 are not arranged in the standing tube 15 and are not illustrated.

  When cleaning the inside of the vertical pipe 15 by the downward cleaning method using the pipe cleaning apparatus 1 configured as described above, after opening the cover (not shown) of the cleaning opening 15a, FIG. 1 and FIG. As shown, the mist nozzle unit 7 is put into the pipe through the cleaning opening 15a of the standing pipe 15 and is locked to the opening 15b. Here, when the cleaning liquid is sprayed downward (downstream) from the mist nozzles 7a, 7b, and 7c, the cleaning liquid sprayed from three directions is arranged so as to collide with each other on the central axis in the pipe.

  When the mist nozzle unit 7 is arranged in the pipe, spraying of the cleaning liquid starts from the mist nozzles 7a, 7b, 7c toward the downstream side in the pipe. As a result, negative pressure is generated in the injection region of the mist nozzles 7a, 7b, and 7c, and the mist nozzles 7a, 7b, and 7c are shielded by the cleaning liquid, and as a result, dirty air in the vertical pipe 15 is blocked. And is not allowed to flow out of the tube.

  Next, the sheath tube 8 is disposed in the cleaning opening 15a of the vertical tube 15, the second hose 5 is placed in the vertical tube 15 through the sheath tube 8, and the second hose 5 further includes three mist nozzles 7a. , 7b, 7c so as to be surrounded by the mist nozzle unit 7. And the 2nd hose 5 is drawn out below and the nozzle N is inserted to the lowest floor in the state which does not inject high pressure water.

When the nozzle N and the mist nozzle unit 7 are arranged in the vertical pipe 15, the nozzle H is lifted while the second hose 5 is pulled up while spraying high-pressure cleaning liquid from the nozzle N onto the inner peripheral surface (tube wall) of the vertical pipe 15. Move N up. As a result, the dirty solid material 50 adhering to the inner peripheral surface of the vertical pipe 15 is washed away, and the pipe is cleaned.
Here, the cleaning liquid continues to be sprayed from the mist nozzle unit 7, and the dirty air in the pipe is prevented from being blown into the chamber even during the cleaning of the pipe by the nozzle N. The spraying of the cleaning liquid from the mist nozzle unit 7 is continued until at least the nozzle N at the tip of the second hose 5 is collected.

  Further, by pulling up the second hose 5 as described above, the second hose 5 is drawn out of the pipe from the cleaning opening 15a of the standing pipe 15. Here, when pulling up the second hose 5, the cleaning liquid sprayed from the mist nozzle unit 7 always hits the second hose 5, and the outer peripheral surface of the hose is cleaned. Therefore, even if the solid material 50 of dirt adheres to the 2nd hose 5 in the standing pipe 15, when it draws out of a pipe | tube, it will be poured off. That is, the second hose 5 and the nozzle N can be recovered without bringing the solid matter 50 such as fats and oils and dirt into the room.

  In the above-described embodiment, the mist nozzle unit 7 includes the three mist nozzles 7a, 7b, and 7c. However, in the present invention, the configuration is not limited to the two mist nozzles. You may comprise with a nozzle or four or more mist nozzles.

Moreover, in the said embodiment, although the structure in the case of performing the downward washing method which wash | cleans the inside of the standing pipe which is a common drain pipe from the lower floor to the upper layer side was demonstrated as an example, the exclusive drainage laid horizontally The tube cleaning device of the present invention can also be suitably used for tube cleaning.
In that case, unlike the downward cleaning method, the nozzle N is inserted into the pipe while spraying the cleaning liquid. However, before the nozzle N is inserted, the mist nozzle unit 7 is arranged at the drain outlet as in the above embodiment. By spraying the cleaning liquid from the mist nozzles 7a, 7b, 7c, it is possible to prevent the dirty air in the pipe from being ejected into the chamber and to clean the second hose 5.

  Further, in the tube cleaning apparatus according to the present invention, the shape of the mist nozzle unit is not limited to the shape of the mist nozzle unit 7 shown in FIGS. 1 to 3, and modified examples are shown in FIGS. 4 and 5. Shapes as shown can also be employed. FIG. 4 is a perspective view of a modified example of the mist nozzle unit as viewed from above, and FIG. 5 is a perspective view of the mist nozzle unit as viewed from below.

  The mist nozzle unit 17 shown in FIG. 4 includes a cylindrical member 18 (cylindrical member) having a top plate 18a (top plate portion) at one end in the axial direction. A first insertion hole 18b for inserting the second hose 5 is formed in the central portion of the top plate 18a, and a second insertion for inserting the third hose 6 is formed on the side of the first insertion hole 18b. A hole 18c is formed.

  4 and 5, an annular attachment 19 (attachment member) for attaching the cylindrical member 18 to a drainage port of the kitchen or bathroom is detachably provided on the bottom surface side of the cylindrical member 18 with a screw or the like. ing. The attachment 19 has a flange portion 19a and is locked to a locking portion (not shown) provided on the outer peripheral portion of the drain outlet by rotating around the axis.

  Further, as shown in FIG. 5, the inside of the attachment 19 is greatly opened on the bottom surface side of the cylindrical member 18. When the attachment 19 is attached to the cylindrical member 18, the diameter is expanded from the outer peripheral surface of the cylindrical member 18 into a flange shape. Therefore, by forming the shapes of various attachments 19 according to the shape of the drain outlet in advance, the mist nozzle unit 17 can be mounted on the drain outlets of various shapes simply by replacing the attachment 19. .

  Further, as shown in FIG. 5, a plurality (three in the figure) of mist nozzles 17a, 17b, and 17c are arranged at equal intervals around the first insertion hole 18b in the cylindrical portion 18, and each of them is sprayed. The washing water collides with each other under the first insertion hole 18b (on the central axis of the cylindrical portion 18).

For example, when the mist nozzle unit 17 configured in this manner is disposed in the kitchen drain 40 as shown in FIG. 6, the attachment 19 attached to the mist nozzle unit 17 is aligned with the drain 40 and around the axis. Rotate. Thereby, since the collar portion 19a of the attachment 19 is locked to a locking portion (not shown) provided in the drain port 40, the mist nozzle unit 17 can be easily fixed to the drain port 40.
Further, the second hose 5 passing through the mist nozzle unit 17 is fixed in the radial direction by the insertion hole 18b of the top plate 18a, so that the second hose 5 is disposed on the central axis of the cylindrical portion 18. Thus, the cleaning liquid sprayed from the three mist nozzles 17a, 17b, and 17c can be reliably applied to the second hose 5.

  Also, for example, when a dedicated drainage channel is cleaned from a drainage port provided on the wall of the bathtub, a drainage channel that is bent 90 degrees immediately after entering the drainage port is formed in FIG. As shown, a pipe member 21 bent in a dogleg shape with a predetermined radius of curvature may be attached to the lower end of the cylindrical member 18. Thereby, the second hose 5 to which the nozzle N is connected can be taken in and out without being bent.

  Further, when the attachment 19 is not used to fix the mist nozzle unit 17 to the drain, for example, instead of the third hose 6 for supplying cleaning water from the mist valve 12 to the mist nozzle unit 17, A metal rod-shaped pipe 22 as shown in FIG. 8 may be used. In that case, the operator can move the cylindrical member 18 (mist nozzle unit 17) while holding the pipe 22, and the cylindrical member 18 (mist nozzle unit 17) can be pressed against the drain port and fixed.

In the mist nozzle unit 17 shown in FIGS. 4 to 8, the cylindrical member 18 is used as a cylindrical member surrounding the mist nozzles 17a, 17b, and 17c. However, the cylindrical member is not limited to a cylinder and has a rectangular shape. If it is.
In the above embodiment, the sub nozzle unit is the mist nozzle unit 17 and the cleaning liquid is sprayed onto the second hose 5 in a mist shape. However, the present invention is not limited thereto. There is no problem as long as the cleaning liquid is jetted.

DESCRIPTION OF SYMBOLS 1 Pipe washing apparatus 2 1st hose 3 Branch member 5 2nd hose 6 3rd hose 7 Mist nozzle unit (sub nozzle unit)
7a Mist nozzle (sub nozzle)
7b Mist nozzle (sub nozzle)
7c Mist nozzle 8 Sheath tube 10 Valve 11 Valve 12 Mist valve 13 Pressure gauge 15 Standing tube 15a Cleaning opening 15b Upper end opening 16A Electrode 16B Electrode 17 Mist nozzle unit (sub nozzle unit)
17a Mist nozzle (sub nozzle)
17b Mist nozzle (sub nozzle)
17c Mist nozzle (sub nozzle)
18 Cylindrical member (Cylinder member)
18a Top plate (top plate)
18b First insertion hole 19 Attachment (attachment member)
N nozzle (main nozzle)

Claims (5)

A main nozzle connected to the downstream end of the hose to which the cleaning liquid is supplied is arranged in the pipe, and a pipe cleaning apparatus for cleaning the inside of the pipe by performing high-pressure injection of the cleaning liquid while moving the main nozzle,
A sub nozzle unit that is disposed upstream of the main nozzle in the pipe and injects the cleaning liquid toward the downstream side,
The pipe cleaning apparatus, wherein the hose in the pipe is cleaned and the air in the pipe is shielded by the cleaning liquid sprayed from the sub nozzle unit.   The sub-nozzle unit has a plurality of sub-nozzles that respectively inject cleaning liquid, and the plurality of sub-nozzles are arranged so as to surround the hose connected to the main nozzle, and each of the sub-nozzle units injects the hose. The tube cleaning apparatus according to claim 1. The sub nozzle unit is
Further, a cylindrical member surrounding the plurality of sub nozzles,
A top plate portion provided at one end of the cylindrical member in the axial direction;
The tube cleaning device according to claim 2, wherein an insertion hole for inserting the hose connected to the main nozzle is formed in the top plate portion. The sub nozzle unit is
The pipe cleaning device according to claim 3, further comprising an attachment member that allows the cylindrical member to be attached to a connection port to the pipe by expanding the diameter from the outer peripheral surface of the cylindrical member into a flange shape. A main nozzle connected to the downstream end of the hose to which the cleaning liquid is supplied is disposed in the pipe, and a pipe cleaning method for cleaning the inside of the pipe by performing high-pressure injection of the cleaning liquid while moving the main nozzle,
A step of disposing a sub nozzle in the pipe, starting spraying the cleaning liquid toward the downstream side, and shielding the air in the pipe;
Inserting and pulling up the main nozzle to a predetermined position downstream of the sub nozzle in the pipe,
In the step of inserting and pulling up the main nozzle into the pipe,
A pipe cleaning method, wherein the cleaning liquid is sprayed from the main nozzle to clean the inside of the pipe, and the outer peripheral surface of the hose is cleaned by the cleaning liquid sprayed from the sub nozzle.

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