JP4548635B2 - Drain pipe cleaning method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a drain pipe cleaning method and apparatus for cleaning piping equipment such as drain pipes installed in an apartment, a building, and the like.
[0002]
[Prior art]
The head portion arranged at the tip of a conventional high-pressure hose used for cleaning piping equipment has injection holes for ejecting the high-pressure water radially diagonally backward with respect to the traveling direction at a predetermined pitch along the circumferential direction. A plurality of nozzles are formed, and a free guide is provided continuously at the tip of the nozzle.
[0003]
Such a high-pressure hose is housed in a rotating drum as shown in Japanese Utility Model Publication No. 55120380 and Japanese Utility Model Publication No. 49-37403, and is rotated against the high-pressure hose by rotating the rotating drum. Giving rotation.
[0004]
On the other hand, the nozzle connected to the tip of the high-pressure hose described above includes a propulsive force generated by high-pressure water sprayed from the nozzle and a high-pressure hose from a rotating drum as disclosed in Japanese Patent Laid-Open No. 54-110658. It advances while rotating in the drainage pipe by the pulling-out operation, thereby cleaning the inner peripheral surface of the pipe.
[0005]
[Problems to be solved by the invention]
By the way, the drain pipes to be cleaned are roughly divided into vertical pipes and horizontal pipes. However, according to the conventional drain pipe cleaning device described above, the high-pressure hose is rotated in the vertical pipes, so that the high-pressure hose ends. When the connected nozzle is rotated, the nozzle turns along the inner peripheral surface of the vertical tube.
[0006]
In this state, when the high-pressure hose is gradually pulled out from the rotating drum and fed into the vertical pipe, the nozzle advances while spirally turning along the inner peripheral surface of the vertical pipe, and the solid matter adhering to the inner peripheral surface of the vertical pipe is It is pulverized and removed with high-pressure water jetted from
[0007]
On the other hand, when the drain pipe is a horizontal pipe, even if the high-pressure hose is rotated in the horizontal pipe, the nozzle does not rotate along the inner peripheral surface because its own weight acts toward the bottom of the pipe.
[0008]
Therefore, even if the high pressure hose is rotated in the horizontal pipe when the drain pipe is a horizontal pipe, and the high pressure hose is gradually pulled out from the rotating drum and fed into the pipe, the nozzle simply advances linearly along the bottom of the horizontal pipe. Only by doing this, it does not turn spirally along the inner peripheral surface of the horizontal tube, and there is a problem that the cleaning power of the upper portion of the inner surface of the horizontal tube is particularly poor.
[0009]
Moreover, since the injection pressure of the high-pressure water injected from the nozzle injection hole decreases as the distance from the tube wall decreases, the solid matter adhering to the upper portion of the horizontal tube far from the tube bottom is crushed with high-pressure water. In order to pulverize this, a facility for supplying a higher pressure and a larger amount of water is required, and in this respect as well, the conventional one cannot efficiently and uniformly clean the inside of the tube.
[0010]
Furthermore, since the above-described conventional nozzle has a structure in which propulsion is obtained by high-pressure water jetted obliquely behind the nozzle, it is necessary to pull back the nozzle once, for example, when repeatedly cleaning a specific position of the pipe. However, in that case, since the nozzle obtains a large driving force by the injection of high-pressure water, a large force is required to pull it back, which is practically difficult. Therefore, conventionally, when repeatedly cleaning a specific position of the pipe, after stopping the injection of high-pressure water, the nozzle is pulled back to the back of the specific position, and then the high-pressure water is again injected obliquely backward to automatically move the nozzle. It was necessary to carry out a complicated operation of running and cleaning again by passing through a specific position to be cleaned.
[0011]
In view of the circumstances described above, the present invention enables a nozzle to be swung along a pipe inner peripheral surface even in a horizontal pipe, and a drain pipe cleaning method capable of repeatedly cleaning a specific position in the pipe with a simple operation, and An object is to provide an apparatus.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problem, in the present invention, a nozzle is provided at the tip of the high-pressure hose, a free guide is connected to the tip of the nozzle, and a jet medium is jetted from a plurality of jet holes drilled in the nozzle, A drain pipe cleaning method for cleaning the inside of a pipe with an injection medium sprayed from the nozzle while rotating the high pressure hose and feeding the high pressure hose into the drain pipe and rotating the nozzle spirally along the inner peripheral surface of the pipe The plurality of injection holes include a specific injection hole having a large diameter and a plurality of other injection holes having a diameter smaller than the specific injection hole, and the central axis I of the specific injection hole and the The angle α at which the central axis H of the nozzle intersects and the angle β at which the central axis J of the other injection holes intersect with the central axis H of the nozzle are set to 90 degrees, respectively, and the formation positions of the plurality of injection holes are adjusted. Yo The injection amount of the injection medium injected from each injection hole is adjusted, and only the specific injection hole is always kept on the pipe inner peripheral surface by each component of the injection pressure of each injection medium injected from the other injection hole. I try to press it.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the drain pipe cleaning method and apparatus according to the present invention will be described in detail.
[0014]
FIG. 1 is a fragmentary sectional view of a main portion of a high-pressure hose showing a nozzle 1 applied to a drain pipe cleaning method and apparatus according to the present invention.
[0015]
The nozzle 1 is directly connected to the tip of a high-pressure hose 2 made of a somewhat flexible rigid tube for feeding high-pressure water, such as a stainless steel hose, via a crimp socket 4. A known universal guide 6 is connected to the tip of the nozzle 1.
For details of the universal guide 6, refer to Japanese Patent Laid-Open No. 62-163789 previously filed by the applicant of the present application.
[0016]
As described above, when the nozzle 1 and the high-pressure hose 2 are directly connected via the crimp socket 4, the length L between the connection end 2a of the high-pressure hose 2 and the tip surface 1a of the nozzle 1 can be set short. Therefore, the bendability of the high pressure hose 2 at the bent portion of the drain pipe can be remarkably improved.
[0017]
On the other hand, as shown in FIG. 2 shown in the AA cross section of FIG. 1, four injection holes 10, 11, 12, 13 for injecting high-pressure water made of water or hot water are formed on the peripheral surface of the nozzle 1. As shown in FIG. 1, these injection holes 10, 11, 12, and 13 communicate with the inside of the hose 2 through the shaft hole 1 b of the nozzle 1 and the hose joint 3.
[0018]
In addition, in an Example, the magnitude | size of the diameter of the injection hole 10 located below among such injection holes 10, 11, 12, and 13 as shown in FIG. , 13 so that the high-pressure water having a larger flow rate is injected from the injection hole 10 than the other injection holes.
[0019]
Of the other injection holes 11, 12, 13, the injection hole 12 is formed at a position symmetrical to the injection hole 10 with the center O of the nozzle 1 as the center, and the injection holes 11, 13 have a circumference around O. Inclined by 60 degrees in opposite directions along the direction, and formed at positions symmetrical to the line segment connecting the injection hole 12 and the center O.
[0020]
In addition, the sum total of the cross-sectional areas of these injection holes 10, 11, 12, and 13 is set to be the same as the sum of the cross-sectional areas of a plurality of injection holes formed in the conventional nozzle.
[0021]
Further, as shown in FIG. 1, the inclination angle of the central axis I of the large-diameter injection hole 10 with respect to the central axis H of the axial hole 1b of the nozzle 1 is set to α = 90 degrees, and the other injection holes 11, Similarly, the inclination angle of the central axis J with respect to the central axis H of the shaft hole 1b of the nozzles 12 and 13 is also set to β = 90 degrees.
[0022]
That is, the central axes I and J of the injection holes 10, 11, 12, and 13 are formed perpendicular to the central axis H of the nozzle 1.
[0023]
In addition, the inclination angle α degree of the injection hole 10 having such a large diameter and the inclination angle β degree of the other injection holes 11, 12, and 13 are set to the same 90 degree, and as shown in FIG. When high pressure water is injected from the injection holes 10, 11, 12, 13 in the direction perpendicular to the central axis H of the nozzle 1 in the pipe 5, the nozzle 1 has its injection pressures F 1, F 2, F 3, F 4 (F 1>). F2 = F3 = F4) and its component force (described later), the posture stopped in the horizontal drainage pipe 5 is maintained in a state where only the injection hole 10 having a large diameter is pressed against the pipe inner peripheral surface 5a.
[0024]
Thus, when high-pressure water is jetted from the jet holes 10, 11, 12, 13 of the nozzle 1, respectively, the inner peripheral surface 5a of the horizontal drain pipe 5 is respectively shown in FIG. Component force F2 ', F4' acts.
[0025]
In that case, the reaction corresponding to F2 ', F4' acts from the inner peripheral surface 5a of the horizontal drain pipe 5 to the nozzle 1, but when the nozzle 1 is on the pipe bottom 5b of the horizontal drain pipe 5,
F1 <F2 ′ + F3 + F4 ′ + mg satisfies the condition (1),
And, when the nozzle 1 is on the pipe 5c as shown in FIG.
F1, F2 ', F3, F4', mg are set to satisfy the condition of F1 <F2 '+ F3 + F4'-mg (2), respectively.
In addition, mg is the dead weight which acts on the nozzle 1, F2 'is a component force which acts on the perpendicular direction of F2, and F4' is a component force which acts on the perpendicular direction of F4.
[0026]
4 and 5, F2 ″ is a component force acting in the horizontal direction of F2, and F4 ″ is a component force acting in the horizontal direction of F4. The rotation of the nozzle 1 in the horizontal tube 5 is prevented by each component force.
[0027]
On the other hand, when F1, F2 ′, F3, F4 ′, and mg are set so as to satisfy the above-described expressions (1) and (2) (that is, the formation positions of the plurality of injection holes and the high pressure injected from each injection hole) 4), when the nozzle 1 is on the tube bottom 5b of the horizontal tube 5, as shown in FIG. 4, the nozzle 1 has only the injection hole 10 based on the setting condition of the equation (1). The posture pressed against the tube bottom 5b is maintained.
[0028]
Further, as shown in FIG. 5, when the nozzle 1 is on the tube 5c of the horizontal tube 5, the nozzle 1 has a posture in which only the injection hole 10 is pressed against the tube 5c based on the setting condition of the expression (2). maintain.
[0029]
When the above-mentioned setting conditions are satisfied, the high-pressure water ejected from the injection hole 10 having the largest diameter in the posture of the nozzle 1 shown in FIG. Since the tube 5 is closest to the tube bottom 5b, the solid matter adhering to the tube bottom 5b of the horizontal tube 5 is efficiently washed by the high-pressure water ejected from the injection hole 10.
[0030]
When warm water is used as high-pressure water, the cleaning efficiency is further improved.
[0031]
Further, in the posture of the nozzle 1 shown in FIG. 5, the high-pressure water ejected from the injection hole 10 having the largest diameter has the largest flow rate, and this injection hole 10 is the largest on the pipe top 5 c of the horizontal pipe 5. Since it approaches, the solid substance adhering to the pipe | tube top 5c of the horizontal pipe 5 will be efficiently wash | cleaned by the high pressure water ejected from this injection hole 10. FIG.
[0032]
Next, the cleaning operation of the drain pipe in the above-described drain pipe cleaning apparatus will be described, and the configuration will be described in more detail.
[0033]
FIG. 6 is a cross-sectional view of the main part of the piping equipment showing the operation of the drain pipe cleaning device according to the present invention.
[0034]
The high-pressure hose 2 continuously connected and fixed to the rear end of the nozzle 1 is connected to a discharge port of a high-pressure pump (not shown) via a terminal 20.
[0035]
The terminal 20 controls the valve that opens and closes the high-pressure water supplied from the high-pressure pump, feeds the high-pressure hose 2 wound around the drum, winds the high-pressure hose 2 around the drum, and rotates the high-pressure hose 2. Do. Details of the terminal 20 are disclosed in Japanese Utility Model Publication No. 56-36856.
[0036]
The drain pipe 21 is washed by injecting high-pressure water pressurized by a high-pressure pump (not shown) from each injection hole 10, 11, 12, 13 (FIG. 2) of the nozzle 1 attached to the tip of the high-pressure hose 2. .
[0037]
That is, when high-pressure water is jetted in a direction perpendicular to the central axis of the nozzle 1, the high-pressure water hits the pipe wall of the drain pipe 21 perpendicularly and crushes and peels off the deposit a in the pipe.
Further, since high-pressure water is applied perpendicularly to the pipe wall of the drain pipe 21, no propulsive force is generated in the nozzle 1 along the extending direction of the drain pipe 21, and the stopped state is maintained at that position. .
[0038]
Therefore, the nozzle 1 described above can be moved forward or backward in the extending direction of the drain pipe 21 by pulling out or pulling back the high-pressure hose 2 manually or automatically.
[0039]
When such a forward or backward operation of the nozzle 1 in the horizontal pipe 5 of the drain pipe 21 is performed, when the high-pressure hose 2 is rotated in one direction from the initial position of the nozzle 1 shown in FIG. In conjunction with this, the nozzle 1 rotates clockwise about the shaft hole 1b as shown by the arrow.
[0040]
When the nozzle 1 rotates, the injection direction of the high-pressure water (F1, F2, F3, F4) injected from the injection holes 10, 11, 12, 13 changes as shown in FIG. In this case, a turning force in the direction of arrow G is generated while maintaining the posture in which only the injection hole 10 is pressed against the pipe inner peripheral surface 5a.
[0041]
In this way, when a turning force in the direction of arrow G is generated while maintaining the posture in which only the injection hole 10 is pressed against the pipe inner peripheral surface 5a, the nozzle 1 has the injection hole 10 as shown in FIG. Always swivels in the horizontal pipe 5 while maintaining the posture facing the pipe inner peripheral surface 5a. Finally, as shown in FIG. 5, the nozzle 1 is located at the position where the injection hole 10 faces the pipe top 5c of the horizontal pipe 5. To reach.
[0042]
As shown in FIG. 5, when the rotation of the high-pressure hose 2 shown in FIG. 6 is stopped when the injection hole 10 of the nozzle 1 reaches the position where the injection hole 10 of the horizontal pipe 5 is opposed to the pipe 5c, the nozzle 1 Stops turning while maintaining the posture in which the injection hole 10 faces the pipe 5c of the horizontal pipe 5.
[0043]
Accordingly, as shown in FIG. 5, the rotation is stopped while maintaining the posture in which the injection hole 10 of the nozzle 1 is opposed to the top 5c of the horizontal tube 5, and then the high-pressure hose 2 is pulled out manually or automatically, or If the pull-back operation is performed, the injection hole 10 of the nozzle 1 advances or retreats along the tube length direction while maintaining the posture facing the tube top 5c of the horizontal tube 5, so that it adheres to the tube top 5c of the horizontal tube 5. Only the adhered substance a in the pipe (FIG. 6) is repeatedly washed with the high-pressure water having the largest flow rate ejected from the injection hole 10, and thus the adhered substance a in the pipe can be pulverized and separated.
[0044]
That is, the above-described nozzle 1 is configured to inject high-pressure water in a direction perpendicular to the central axis thereof so that no propulsive force is generated in the nozzle 1 itself. Thus, repeated cleaning of a specific position of the drain pipe 21 can be easily performed by pulling out or pulling back the high-pressure hose 2.
[0045]
Furthermore, by rotating the high-pressure hose 2 from the position of the nozzle 1 shown in FIG. 5 by the terminal device 20 (FIG. 6), the nozzle 1 is further rotated clockwise about the shaft hole 1b as shown by the arrow, During the rotation, the injection direction of the high-pressure water (F1, F2, F3, F4) injected from the injection holes 10, 11, 12, 13 again changes as shown in FIG. The turning in the direction of arrow G is started while maintaining the posture in which only the injection hole 10 is pressed against the pipe inner peripheral surface 5a.
[0046]
In this way, when the nozzle 1 starts turning in the arrow G direction while maintaining the posture in which only the injection hole 10 is pressed against the pipe inner peripheral surface 5a, the nozzle 1 has the injection hole 10 as shown in FIG. The nozzle 1 is swung in the horizontal tube 5 while maintaining a posture that always faces the inner peripheral surface 5a of the tube. Finally, as shown in FIG. 4, the nozzle 1 has an initial position in which the injection hole 10 is opposed to the bottom 5b of the horizontal tube 5. Return to.
[0047]
Therefore, in the horizontal pipe 5 of the drain pipe 21 shown in FIG. 6, the high-pressure hose 2 is rotated by the terminal 20 and the high-pressure hose 2 is pulled out or pulled back as shown in the enlarged view of the main part shown in FIG. By operating the nozzle 1, the nozzle 1 has the largest injection amount, and is rotated spirally in the direction of the arrow G while maintaining the posture in which the injection hole 10 is opposed to the inner peripheral surface 5 a of the pipe. The in-pipe adhering matter adhering to a specific position on the peripheral surface 5a is repeatedly washed with high-pressure water having the largest flow rate to be sprayed and efficiently pulverized and separated.
[0048]
Further, the rotation of the high pressure hose 2 is stopped to stop the nozzle 1 at a certain position, and then the high pressure hose 2 is pulled out or pulled back, so that the nozzle 1 has the highest injection amount as shown in FIG. While maintaining the posture in which the injection hole 10 is opposed to the inner peripheral surface 5a of the pipe, the reciprocating traveling is performed in the direction of the arrow G ', thereby injecting the adhering matter in the tube adhering to a specific position on the inner peripheral surface 5a of the horizontal tube 5 It is possible to efficiently pulverize and peel by repeatedly washing with high-pressure water having the largest flow rate.
[0049]
Note that, also in the vertical main pipe of the drain pipe (not shown), the nozzle 1 rotates spirally on the inner peripheral surface of the pipe by rotating the high-pressure hose 2 at a constant speed and pulling out the high-pressure hose 2.
[0050]
Also in this case, the nozzle 1 efficiently grinds the deposits in the pipe even in the vertical pipe because the injection hole 10 having the largest injection amount is rotated spirally while maintaining the posture in which the injection hole 10 is opposed to the inner peripheral surface of the vertical main pipe. It will peel off.
[0051]
Also in the vertical pipe, the rotation of the high-pressure hose 2 is stopped to stop the nozzle 1 at a certain position, and then the high-pressure hose 2 is pulled out or pulled back, so that the nozzle 1 has the largest injection amount. While reciprocating while maintaining the posture in which the injection hole 10 is opposed to a specific position on the inner peripheral surface of the vertical pipe, the flow rate at which the in-pipe deposits adhering to the specific position on the inner peripheral surface of the vertical pipe are injected is the highest. It can be efficiently washed and separated by repeated washing with large high-pressure water.
[0052]
As shown in FIG. 1, the nozzle 1 and the high-pressure hose 2 are directly connected via the crimping socket 4, thereby shortening the length L between the connection end 2 a of the high-pressure hose 2 and the tip end face 1 a of the nozzle 1. Since it is set, as shown in FIG. 13, in the bent portion 23 of the drain pipe 21, the curvature of the high-pressure hose 2 near the nozzle 1, that is, the radius of curvature at the time of bending can be set even smaller. The nozzle 1 can smoothly pass through the bent portion 23 of the small-diameter drain pipe, and the bent portion 23 of the small-diameter drain pipe can be cleaned efficiently.
[0053]
In the above embodiment, since it is possible to maintain the posture in which the injection hole 10 having the largest injection amount is always opposed to the inner peripheral surface of the drain pipe, as shown in FIG. A reference line 30 indicating the position of the injection hole 10 is formed along the longitudinal direction on the peripheral surface of the corresponding portion of the high pressure hose 2, so that the position of the injection hole 10 is changed in the pipe while the high pressure hose 20 is rotated. It is possible to know with certainty which position on the peripheral surface.
[0054]
For this reason, for example, when only the drain pipe is carefully washed, the rotation of the high-pressure hose 2 is stopped at the rotational position where the position of the injection hole 10 reaches the pipe by the reference line 30, and the high-pressure hose is removed therefrom. If 2 is pulled out and pulled back, only the drain pipe can be carefully and repeatedly washed.
[0055]
In the above embodiment, the case where the four injection holes 10, 11, 12, 13 for injecting high-pressure water into the nozzle 1 are described in detail. However, the above-described formulas (1) and (2) are expressed as a whole. The number of injection holes, the formation position, the size of the diameter, and the like are not limited to those in the embodiment, and various modifications are conceivable.
[0056]
In the above embodiment, the case where a liquid such as water or warm water is used as the spray medium ejected from each of the spray holes 10, 11, 12, 13 of the nozzle 1 is described in detail. However, the present invention is limited to the above embodiment. Instead, a mixture of liquid and gas may be used as the ejection medium.
[0057]
As described above, when a mixture of liquid and gas is used as the ejection medium, when the ejection medium collides with the drain pipe, the mixed gas can be repelled to further improve the cleaning power.
[0058]
Various liquids and gases constituting the ejection medium can be used. For example, water or warm water can be used as the liquid , and air can be used as the gas.
[0059]
【The invention's effect】
As described above, in the drain pipe cleaning method and apparatus of the present invention, only a specific injection hole out of the plurality of injection holes always faces the inner peripheral surface of the pipe as the high-pressure hose is rotated, pulled out, and pulled back. As described above, the nozzle is swirled spirally, the diameter of the specific injection hole is set larger than the diameters of the other injection holes, and the central axis I of the specific injection hole and the central axis H of the nozzle are Is set to 90 degrees, and the angle β at which the central axis J of the other injection holes and the central axis H of the nozzle intersect each other is set to 90 degrees. Not only can the adhered deposits be efficiently crushed with high-pressure water sprayed from a specific injection hole with a large diameter, but also the specific position within the drain pipe with the specific injection hole with a large diameter facing the pipe inner peripheral surface. To stop Therefore, by simply pulling out or pulling back the high-pressure hose, regardless of whether it is a horizontal tube or a vertical tube, a specific position in various types of tubes is repeatedly washed with high-pressure water injected from a specific injection hole with a large diameter. Thus, a specific position in the tube can be carefully cleaned by a simple operation.
[Brief description of the drawings]
FIG. 1 is a fragmentary sectional view showing a nozzle according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a fragmentary sectional view showing a state in which a nozzle is disposed in a horizontal tube.
4 is a BB cross-sectional view of FIG. 3;
FIG. 5 is a sectional view showing the operation of the present invention.
FIG. 6 is a cross-sectional view of a main part showing a drain pipe facility.
FIG. 7 is a cross-sectional view showing the operation of the present invention.
FIG. 8 is a sectional view showing the operation of the present invention.
FIG. 9 is a cross-sectional view showing the operation of the present invention.
FIG. 10 is a cross-sectional view showing the operation of the present invention.
FIG. 11 is a fragmentary sectional view showing the action of a nozzle in a horizontal tube.
FIG. 12 is a fragmentary sectional view showing the action of the nozzle in the horizontal tube.
FIG. 13 is a fragmentary sectional view showing the action of the nozzle in the bent portion of the drain pipe.
FIG. 14 is a plan view of a high-pressure hose showing a reference line indicating the position of a specific injection hole.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Nozzle 2 ... High pressure hose 6 ... Swivel guide 10, 11, 12, 13 ... Injection hole 30 ... Reference line H, I, J ... Center axis

Claims (12)

A nozzle is provided at the tip of the high-pressure hose, a free guide is connected to the tip of the nozzle, a jet medium is jetted from a plurality of jet holes drilled in the nozzle, and the high-pressure hose is rotated while draining the high-pressure hose. In the drainage pipe cleaning method for cleaning the inside of the pipe with an injection medium sprayed from the nozzle while feeding the pipe into the pipe and rotating the nozzle spirally along the inner peripheral surface of the pipe,
The plurality of injection holes have a specific injection hole having a large diameter and a plurality of other injection holes having a diameter smaller than the specific injection hole,
The angle α at which the center axis I of the specific injection hole and the center axis H of the nozzle intersect, and the angle β at which the center axis J of the other injection hole and the center axis H of the nozzle intersect are set to 90 degrees, respectively. With
Adjusting the formation position of the plurality of injection holes and the injection amount of the injection medium injected from each injection hole;
The drain pipe cleaning method, wherein only the specific injection hole is always pressed against the inner peripheral surface of the pipe by each component of the injection pressure of each injection medium injected from the other injection holes. The drain pipe cleaning method according to claim 1, wherein the nozzle and the high-pressure hose are directly connected via a crimp socket. The drain pipe cleaning method according to claim 1, wherein a reference line indicating a position of the specific injection hole is formed along a longitudinal direction of the surface of the high pressure hose. The drain pipe cleaning method according to claim 1, wherein the ejection medium is water or warm water. The drainage pipe cleaning method according to any one of claims (1) to (3) , wherein the ejection medium is composed of a mixture of liquid and gas. 6. The drain pipe cleaning method according to claim 5, wherein the liquid is water or warm water, and the gas is air. A nozzle is provided at the tip of the high-pressure hose, a free guide is connected to the tip of the nozzle, a jet medium is jetted from a plurality of jet holes drilled in the nozzle, and the high-pressure hose is rotated while draining the high-pressure hose. In a drainage pipe cleaning apparatus for cleaning the inside of a pipe with an injection medium sprayed from the nozzle while feeding the pipe into the pipe and rotating the nozzle spirally along the inner peripheral surface of the pipe,
The plurality of injection holes have a specific injection hole having a large diameter and a plurality of other injection holes having a diameter smaller than the specific injection hole,
The angle α at which the center axis I of the specific injection hole and the center axis H of the nozzle intersect, and the angle β at which the center axis J of the other injection hole and the center axis H of the nozzle intersect are set to 90 degrees, respectively. With
Adjusting the formation position of the plurality of injection holes and the injection amount of the injection medium injected from each injection hole;
The drain pipe cleaning device, wherein only the specific injection hole is constantly pressed against the inner peripheral surface of the pipe by each component of the injection pressure of each injection medium injected from the other injection holes. The drain pipe cleaning device according to claim 7, wherein the nozzle and the high-pressure hose are directly connected to each other through a crimp socket. 8. The drain pipe cleaning device according to claim 7, wherein a reference line indicating a position of the specific injection hole is formed along a longitudinal direction of the surface of the high pressure hose. The drain pipe cleaning device according to claim 7, wherein the ejection medium is water or warm water. The drain pipe cleaning device according to any one of claims (7) to (9) , wherein the ejection medium is configured by a mixture of a liquid and a gas. 12. The drain pipe cleaning device according to claim 11, wherein the liquid is water or warm water, and the gas is air.

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