Cleaning device and cleaning method

Abstract

To clean the inside of a branch pipe 3a to a 3f from a vertical pipe 2 side.SOLUTION: A cleaner 10 for cleaning the inside of branch pipes 3a to 3f of a building 1 having a vertical pipe 2 for supplying and draining water and the branch pipes 3a to 3f connected to the vertical pipe 2 and provided horizontally includes a water supply device 11 for supplying a washing liquid, a tubular member 12 connected to the water supply device 11 and inserted into the vertical pipe 2, and a protrusion 13 connected to the tubular member 12 and protruding from the tubular member. 3a 3f, the cleaning liquid is discharged.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cleaning device and a cleaning method. [Background technology]

[0002] In multi-story buildings such as buildings and apartment buildings, the water supply and drainage facilities may consist of a standpipe installed vertically and branch pipes connected to the standpipe and running horizontally to the water supply and drainage facilities on each floor (for example, the kitchen sink).

[0003] Furthermore, the interiors of the standpipes and branch pipes require periodic cleaning, but standpipes can usually be cleaned from the outside of the building using a high-pressure hose or the like (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-342661 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the inside of branch pipes has usually been cleaned from inside the building (for example, from the drain of a kitchen sink). This means that in an apartment building, for example, residents must be present when cleaning the inside of branch pipes, which can be a hassle for residents, as it requires adjusting their schedules and allowing others to see into their rooms.

[0006] Cleaning companies also need to be considerate when entering other people's rooms, and there is a risk of getting the room wet or dirtying it with sludge from wastewater, and there is also the risk of residents making complaints that go unreported, making this a job that is prone to problems.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its object is to enable cleaning of the inside of a branch pipe from the standpipe side.

[0008] The main invention for achieving the above-mentioned object is a cleaning device for cleaning the inside of a branch pipe in a building having a standpipe installed in a vertical direction for water supply and drainage, and a branch pipe connected to the standpipe and installed in a horizontal direction, the cleaning device comprising: a water supply device for supplying cleaning liquid; a pipe connected to the water supply device and through which the cleaning liquid flows, a tubular member inserted into the standpipe; and a protrusion protruding from the tubular member connected to the tubular member and having an outlet through which the cleaning liquid is discharged, the cleaning liquid being discharged when the outlet of the protrusion is inserted into the inside of the branch pipe.

[0009] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0010] The cleaning device of the present invention is a cleaning device for cleaning the inside of a branch pipe in a building having a standpipe arranged vertically for water supply and drainage, and a branch pipe connected to the standpipe and arranged horizontally, and is characterized in that it comprises a water supply device that sends out cleaning liquid, a pipe connected to the water supply device and through which the cleaning liquid flows, a tubular member that is inserted into the standpipe, and a protrusion that protrudes from the tubular member and is connected to the tubular member and has an outlet through which the cleaning liquid is discharged, and the cleaning liquid is discharged when the outlet of the protrusion is inserted into the inside of the branch pipe. [Effects of the Invention]

[0011] According to the present invention, a cleaning device can be provided for cleaning the inside of a branch pipe in a building having a standpipe arranged vertically for water supply and drainage, and a branch pipe connected to the standpipe and arranged horizontally, the cleaning device comprising: a water supply device for supplying cleaning liquid; a pipe connected to the water supply device and through which the cleaning liquid flows, a tubular member inserted into the standpipe; and a protrusion protruding from the tubular member connected to the tubular member and having an outlet through which the cleaning liquid is discharged, wherein the cleaning liquid is discharged when the outlet of the protrusion is inserted into the inside of the branch pipe. [Brief explanation of the drawings]

[0012] The drawings illustrate specific embodiments of the invention according to the present disclosure, including essential features of the invention as well as alternative and preferred embodiments. [Figure 1] FIG. 1 is a diagram showing a state in which a branch pipe of a building is being cleaned using the cleaning device according to the first embodiment. [Figure 2] FIG. 2 is an enlarged view of a protruding portion of the cleaning device in FIG. [Figure 3] 10 is a flowchart showing a cleaning method using the cleaning device. [Figure 4] FIG. 3 corresponds to FIG. 2 and shows a first modified example. [Figure 5] FIG. 10 corresponds to FIG. 2 and shows a second modified example. [Figure 6] FIG. 2 corresponds to FIG. 1 and shows a second embodiment. [Figure 7] More specifically, examples include tubular members, protrusions, and nozzles. [Figure 8] FIG. 8 is a cross-sectional view of the tubular member, the protrusion, and the nozzle shown in FIG. 7.

[0013] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0014] A cleaning device for cleaning the inside of a branch pipe in a building having a standpipe installed vertically for water supply and drainage, and a branch pipe connected to the standpipe and installed horizontally, the cleaning device comprising: a water supply device for supplying cleaning liquid; a tubular member connected to the water supply device and through which the cleaning liquid flows, the tubular member being inserted into the inside of the standpipe; and a protrusion protruding from the tubular member connected to the tubular member and having an outlet through which the cleaning liquid is discharged, the cleaning liquid being discharged when the outlet of the protrusion is inserted into the inside of the branch pipe.

[0015] According to this type of cleaning device, cleaning liquid is discharged from the protruding portion into the branch pipe, making it possible to clean the inside of the branch pipe from the standpipe side.

[0016] In such a cleaning device, it is desirable that a nozzle is provided at the discharge port of the protrusion, and the cleaning liquid is discharged from the nozzle.

[0017] According to such a cleaning device, the shape of the nozzle makes it possible to eject the cleaning liquid at high pressure, and the cleaning liquid can be ejected in various patterns.

[0018] In such a cleaning device, it is desirable that the protrusion is an L-shaped joint and the nozzle is a rotary nozzle.

[0019] Such a cleaning device can be easily protruded at low cost using an L-shaped joint and a rotary nozzle, and cleaning efficiency can be improved.

[0020] It is desirable that such a cleaning device be provided with a camera that can confirm the position of the branch pipe and the position of the protrusion.

[0021] According to such a cleaning device, by providing a camera, it is possible to more easily insert the protruding portion into the branch pipe.

[0022] It is desirable that such a cleaning device is provided with a camera that can check the inside of the branch pipe.

[0023] Such a cleaning device allows the user to check the state of the dirt, thereby reducing the amount of dirt remaining.

[0024] It is desirable that the tubular member has a plurality of protrusions, and that the cleaning liquid be discharged with each of the plurality of protrusions inserted into a different branch pipe.

[0025] Such a cleaning device can simultaneously clean a plurality of branch pipes, thereby reducing the cleaning time.

[0026] In such a cleaning device, it is desirable that the protruding portion protrudes at an angle of 30 degrees or more and 150 degrees or less, when the extending direction of the tubular member is set to 0 degrees.

[0027] With such a cleaning device, the protrusion is more likely to catch, making it easier to insert the protrusion into the branch pipe.

[0028] In such a cleaning device, it is desirable that the protrusion protrudes in the radial direction of the tubular member by a length that is not less than 1.0 times and not more than 10 times the diameter of the tubular member.

[0029] With such a cleaning device, if the length of the protrusion is less than 1.0 times the diameter of the tubular member, the protrusion will be difficult to catch, and if it exceeds 10 times, the protrusion will become too large and it will be difficult to insert the protrusion into the branch pipe.

[0030] A cleaning method for cleaning the inside of a branch pipe in a building having a standpipe installed vertically for water supply and drainage, and a branch pipe connected to the standpipe and installed horizontally, the cleaning method comprising: a tubular member inserting step of inserting a tubular member connected to a water supply device into the inside of the standpipe; a protrusion inserting step of inserting a protrusion protruding from the tubular member, which is connected to the tubular member and has an outlet from which cleaning liquid is discharged, into the inside of the branch pipe; and a water supplying step of starting the water supply device to send out the cleaning liquid.

[0031] According to this cleaning method, the inside of the branch pipe can be cleaned from the standpipe side by flowing the cleaning liquid discharged from the protruding portion into the branch pipe. DETAILED DESCRIPTION OF THE INVENTION

[0032] [First embodiment] <About the cleaning device 10> The cleaning device 10 according to the first embodiment will be described below with reference to the drawings. Fig. 1 is a diagram showing a state in which the cleaning device 10 is used to clean a branch pipe 3b of a building 1, and Fig. 2 is an enlarged view of a protruding portion 13 of the cleaning device 10 in Fig. 1.

[0033] The building 1 shown in Figure 1 is a multi-story building 1 with a three-story structure and a vertical standpipe 2 in the center. The standpipe 2 penetrates from the roof of the building 1 to underground, and is used here as a drainage pipe (the underground portion is omitted, but it is connected to a drainage ditch). Branch pipes 3a to 3f are also connected to the standpipe 2.

[0034] The branch pipes 3a to 3f are connected to the drainage equipment 4 (for example, washbasins, sinks, bathtubs, etc.) in each room on each floor, and are pipes for directing wastewater discharged from the drainage equipment 4 into the standpipe 2. The branch pipes 3a to 3f generally have a downward slope toward the standpipe 2, so that the wastewater that flows from the drainage equipment 4 into the branch pipes 3a to 3f naturally flows back into the standpipe 2.

[0035] Cleaning device 10 includes water supply device 11, tubular member 12, and protrusion 13. Water supply device 11 includes a tank (not shown) for storing cleaning liquid for cleaning, and a pump (not shown) for pumping out the cleaning liquid, and by starting water supply device 11, cleaning liquid can be supplied from a water supply port.

[0036] The tubular member 12 is a so-called hose, and one end of the tubular member 12 is connected to the water supply port of the water supply device 11, and is a member for flowing the cleaning liquid delivered from the water supply device 11 to the other end. The other end of the tubular member 12 is connected to a protruding portion 13 having a discharge port through which the cleaning liquid is discharged.

[0037] In addition, the tubular member 12 is transported wound around a drum (not shown) provided on the cleaning device 10, and when inserting it into the inside of the vertical pipe 2, the drum is unwound to stretch the tubular member 12 in a straight line while inserting (lowering) it.

[0038] 2, protrusion 13 is a member that protrudes in a direction (approximately horizontal) that intersects with the extension direction of tubular member 12. When inserted into branch pipe 3b, cleaning liquid flowing from tubular member 12 is discharged from the discharge port to clean the inside of branch pipe 3b.

[0039] That is, the cleaning device 10 according to the first embodiment is a cleaning device 10 for cleaning the inside of branch pipes 3a to 3f of a building 1 having a standpipe 2 installed vertically for water supply and drainage and branch pipes 3a to 3f connected to the standpipe 2 and installed horizontally, and includes a water supply device 11 that sends out cleaning liquid, a tubular member 12 that is connected to the water supply device 11 and through which the cleaning liquid flows and is inserted into the standpipe 2, and a protruding portion 13 that protrudes from the tubular member 12 and is connected to the tubular member 12 and has a discharge port through which the cleaning liquid is discharged, and the cleaning liquid is discharged with the discharge port of the protruding portion 13 inserted into the branch pipes 3a to 3f. In this way, the cleaning liquid discharged from the protruding portion 13 is discharged into the branch pipes 3a to 3f, making it possible to clean the inside of the branch pipes 3a to 3f from the standpipe 2 side.

[0040] It should be noted that protrusion 13 does not necessarily have to protrude in a direction intersecting the extension direction of tubular member 12, but may protrude outward from the outer periphery of tubular member 12 and be insertable into branch pipes 3a to 3f.

[0041] More specifically, the protruding angle of protruding portion 13 is preferably 30 degrees or more and 150 degrees or less with respect to the extension direction of tubular member 12. In other words, protruding portion 13 should protrude at an angle of 30 degrees or more and 150 degrees or less, assuming that the extension direction of tubular member 12 is 0 degrees. This makes protruding portion 13 more likely to catch, making it easier to insert protruding portion 13 into branch pipe 3b.

[0042] Furthermore, the protruding length of the protrusion is preferably 1.0 to 10 times the diameter of the tubular member 12. In other words, the protrusion 13 protrudes in the radial direction of the tubular member 12 by a length that is 1.0 to 10 times the diameter of the tubular member 12. In the first embodiment, the length is approximately twice the diameter.

[0043] If the length of the protrusion 13 is less than 1.0 times the diameter of the tubular member 12, the protrusion 13 will be difficult to catch, and if it exceeds 10 times, the protrusion 13 will become too large and it will be difficult to insert the protrusion 13 into the branch pipe 3b.

[0044] 2, the cleaning device 10 according to the first embodiment is provided with a shower head-shaped nozzle 14 for pressurizing the cleaning liquid to be discharged from the discharge port of the protrusion 13. That is, the nozzle 14 is provided at the discharge port of the protrusion 13, and the cleaning liquid is discharged from the nozzle 14.

[0045] This allows the cleaning liquid to be discharged at high pressure using, for example, a variable nozzle or a rotary nozzle, which are nozzles used for high-pressure washing, depending on the shape of the nozzle 14. It also allows the cleaning liquid to be discharged in various spray patterns (for example, a pattern with a circular cross section or a spiral pattern).

[0046] <About the cleaning method using the cleaning device 10> Next, a cleaning method using the cleaning device 10 will be described with reference to the drawings. Fig. 3 is a flowchart showing the cleaning method using the cleaning device 10. Note that the following describes, as an example, the procedure for cleaning the branch pipe 3b shown in Fig. 1.

[0047] First, as preparation, the cleaning device 10 is carried to the rooftop and the cover of the standpipe 2 is removed (step S1). In the first embodiment, cleaning is performed on the rooftop from the upper end of the standpipe 2, but cleaning may also be performed on the ground from the lower end of the standpipe 2. In other words, it is best to start cleaning from an appropriate location in the building to be cleaned.

[0048] Next, the tubular member 12 and the protruding portion 13 are inserted into the standpipe 2 from the upper end thereof (step S2). In the cleaning device 10 according to the first embodiment, the protruding portion 13 is provided at the tip of the tubular member 12, so the tubular member 12 is inserted into the standpipe 2 with the protruding portion 13 at the front.

[0049] Then, the protruding portion 13 is lowered to the position of the branch pipe 3b to be cleaned (step S3). As described above, the tubular member 12 is wound around the drum, so the drum is unwound to straighten the tubular member 12, thereby lowering the protruding portion 13 to the position of the branch pipe 3b.

[0050] Once protruding portion 13 has been lowered to the vicinity of branch pipe 3b, the position of protruding portion 13 is adjusted, and protruding portion 13 and nozzle 14 are inserted into branch pipe 3b (step S4). For example, protruding portion 13 may be inserted so that it catches on the inside of branch pipe 3b (by sliding it down the inner surface of standpipe 2 so that it catches), or tubular member 12 may be slightly bent and protruding portion 13 may be inserted by swinging it like a pendulum.

[0051] Note that protrusion 13 may be fixed after being inserted into branch pipe 3b. As a fixing method, for example, protrusion 13 may be provided with a tension member that expands and contracts with electricity or water pressure, and after insertion, the tension member may be tensioned against the inner surface of branch pipe 3b to fix it, or if protrusion 13 is made of a material that attracts a magnet, an electromagnet may be provided on protrusion 13, and after insertion, the electromagnet may be turned on to fix it.

[0052] Then, the water supply device 11 is started to discharge the cleaning liquid into the inside of the branch pipe 3b to clean the inside (step S5). The cleaning liquid to be discharged can be, for example, water, synthetic detergent water, hot water, ozone water, polishing water containing fine abrasive grains, etc., and an appropriate one can be selected for cleaning.

[0053] Once cleaning is complete, the water supply is stopped, the tubular member 12 is pulled up to the roof, and the standpipe 2 is closed (step S6). Normally, cleaning is completed once all of the branch pipes 3a to 3f have been cleaned. That is, after branch pipe 3b is finished, for example, branch pipe 3a is cleaned, followed by branch pipes 3c, 3d, 3e, and 3f, and then the tubular member 12 is pulled up to the roof.

[0054] That is, the cleaning method using the cleaning device 10 according to the first embodiment is a cleaning method for cleaning the insides of the branch pipes 3a-3f of a building 1 having a standpipe 2 installed vertically for water supply and drainage and branch pipes 3a-3f connected to the standpipe 2 and installed horizontally, and includes a tubular member inserting step (step S2) of inserting a tubular member 12 connected to a water supply device 11 into the inside of the standpipe 2, a protruding part inserting step (steps S3 and S4) of inserting a protruding part 13 connected to the tubular member 12 and having a discharge port from which cleaning liquid is discharged, into the insides of the branch pipes 3a-3f, and a water supplying step (step S5) of starting the water supply device 11 to discharge the cleaning liquid. In this way, the cleaning liquid is discharged from the protruding part 13 into the branch pipes 3a-3f, making it possible to clean the insides of the branch pipes 3a-3f from the standpipe 2 side.

[0055] <Regarding Modification 1 and Modification 2> Next, Modifications 1 and 2 of the cleaning device 10 according to the first embodiment will be described with reference to the drawings. Fig. 4 is a diagram corresponding to Fig. 2 of the first embodiment, showing Modification 1. Only differences from the first embodiment will be described.

[0056] In Modification 1, as shown in Fig. 4, a camera 15 is provided inside the standpipe 2 on the left side (branch pipe 3a side) of the tubular member 12. This camera 15 is connected by a cable to a display unit (not shown) such as a panel on the roof, and the image captured by this camera 15 can be viewed on the roof.

[0057] The provision of this camera 15 makes it possible to adjust the position of protrusion 13 and insert it into branch pipe 3b while checking the image from camera 15. In other words, in Modification 1, camera 15 is provided that can check the positions of branch pipe 3b and protrusion 13. This makes it easier to insert protrusion 13 into branch pipe 3b.

[0058] This is particularly necessary in multi-story buildings with many floors. In other words, the more floors a building has, the farther the distance to the branch pipe to be cleaned becomes, and the darker the interior of the standpipe becomes, the harder it is for light to reach. This makes it difficult to determine the position of the protrusion 13. Therefore, for example, if a light (not shown) is attached to the camera 15 and it is lowered to a position where the protrusion 13 and the branch pipe to be cleaned can be seen, the position can be visually confirmed, making it easier to insert the protrusion 13.

[0059] Next, Modification 2 will be described with reference to the drawings. Fig. 5 is a diagram corresponding to Fig. 2 and showing Modification 2. In Modification 2, as shown in Fig. 5, a branch pipe camera 16 is provided inside the stand pipe 2, above the protruding portion 13, for photographing the inside of the branch pipe 3b.

[0060] This branch pipe camera 16 is connected by a cable to a display unit (not shown) on the roof, and the images captured by this branch pipe camera 16 can be viewed on the roof. In other words, in Modification 2, a branch pipe camera 16 is provided that can check the inside of branch pipe 3b. This makes it possible to check the state of dirt inside branch pipe 3b during cleaning, thereby reducing the amount of dirt remaining.

[0061] Since almost no light enters the inside of branch pipe 3b, lighting (not shown) is essential for branch pipe camera 16. In addition, since the positional relationship between branch pipe 3b and protrusion 13 can be grasped, the work of inserting protrusion 13 into branch pipe 3b can be simplified.

[0062] [Second embodiment] Next, a cleaning device 20 according to a second embodiment will be described with reference to the drawings. Fig. 6 is a view corresponding to Fig. 1 of the first embodiment, and shows the second embodiment. Only differences from the first embodiment will be described.

[0063] In the second embodiment, a cleaning device 20 is used as shown in Fig. 6. The difference between cleaning device 20 and cleaning device 10 is that three protrusions 23a, 23b, and 23c are connected to tubular member 22, and protrusions 23a, 23b, and 23c are inserted into different branch pipes 3b, 3d, and 3f, respectively.

[0064] That is, in cleaning device 20 according to the second embodiment, tubular member 22 has a plurality of protrusions 23a-23c, and cleaning liquid is discharged with each of the plurality of protrusions 23a-23c inserted into a different branch pipe 3b, 3d, 3f. In this way, by cleaning the plurality of branch pipes 3b, 3d, 3f simultaneously, cleaning time can be shortened (even if simultaneous cleaning is not possible, the effort required to move the protrusions is reduced, making it possible to shorten cleaning time).

[0065] In addition, in the second embodiment, since the building 1 is three stories tall, there are three protrusions 23a to 23c connected to the tubular member 22, but there is no limit to the number, and for example, if the building is ten stories tall, ten protrusions may be connected.

[0066] In this case, for example, if all 10 nozzles were washed at the same time, there is a risk of a large difference in water pressure of the cleaning liquid between the first and tenth floors. Therefore, it is a good idea to provide something like a solenoid valve on each nozzle so that the nozzle from which the cleaning liquid is to be discharged can be selected.

[0067] Furthermore, if the spacing between protrusions 23a to 23c is confirmed in advance using drawings of building 1, etc., and they are attached to tubular member 22 at the same spacing as that between branch pipes 3b, 3d, and 3f, the insertion of protrusions 23a to 23c into branch pipes 3b, 3d, and 3f will be simplified.

[0068] [Other embodiments] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof.

[0069] FIG. 7 shows a more specific example of the tubular member 12, protrusion 13, and nozzle 14. As described in the first embodiment, the protrusion 13 does not need to protrude in a direction intersecting the extension direction of the tubular member 12, and may protrude obliquely in the direction of protrusion angle A, as shown in FIG. 7. The protrusion angle A may also be freely changeable. In FIG. 7, the protrusion 13 is connected at an inclination of protrusion angle A = 135 degrees. The protruding length of the protrusion 13 is approximately twice the diameter of the tubular member 12.

[0070] 8 is a cross-sectional view of the tubular member 12, protrusion 13, and nozzle 14 shown in FIG. 7. As shown in FIG. 8, the tubular member 12, protrusion 13, and nozzle 14 are each fixed with screws or the like so that they can be easily disassembled. More specifically, the protrusion 13 is an L-shaped joint, and the nozzle 14 is a rotating nozzle. This allows for inexpensive and easy protrusion using the L-shaped joint and rotating nozzle. The rotating nozzle also has discharge outlets at the tip and side (a total of three locations) and cleans while rotating due to water pressure, thereby improving cleaning efficiency.

[0071] In the above embodiment, the shape of the protrusion 13 is cylindrical, but the present invention is not limited to this, and it is sufficient if only a part of the protrusion can be inserted into the branch pipe. For example, the protrusion may be funnel-shaped, gradually tapering toward the tip, so that only a part of the protrusion, not the entire protrusion, is inserted. [Explanation of symbols]

[0072] 1. Building 2 Standpipe 3a~3f Branch pipe 4 Drainage equipment 10 Cleaning equipment 11 Water supply device 12 Tubular member 13 Protrusion 14 nozzles

Claims

1. A cleaning device for cleaning the inside of a branch pipe in a building having a standpipe installed along a vertical direction for water supply and drainage, and a branch pipe connected to the standpipe and installed along a horizontal direction, a water supply device for supplying cleaning liquid; a tubular member connected to the water supply device and through which the cleaning liquid flows, the tubular member being inserted into the standpipe; a protrusion connected to the tubular member and having a discharge port through which the cleaning liquid is discharged, the protrusion protruding from the tubular member; The cleaning device is characterized in that the cleaning liquid is discharged with the discharge port of the protruding portion inserted into the inside of the branch pipe.

2. 2. The cleaning device of claim 1, a nozzle is provided at the outlet of the protrusion, The cleaning device is characterized in that the cleaning liquid is discharged from the nozzle.

3. 3. The cleaning device according to claim 2, The protrusion is an L-shaped joint, A cleaning device characterized in that the nozzle is a rotary nozzle.

4. 2. The cleaning device of claim 1, A cleaning device characterized by comprising a camera capable of confirming the position of the branch pipe and the position of the protrusion.

5. 2. The cleaning device of claim 1, The cleaning device is characterized by comprising a branch pipe camera capable of checking the inside of the branch pipe.

6. 2. The cleaning device of claim 1, The tubular member includes a plurality of the protrusions, The cleaning device is characterized in that the cleaning liquid is discharged when each of the plurality of protrusions is inserted into a different branch pipe.

7. 2. The cleaning device of claim 1, The cleaning device is characterized in that the protruding portion protrudes at an angle of 30 degrees or more and 150 degrees or less, when the extending direction of the tubular member is set to 0 degrees.

8. 2. The cleaning device of claim 1, The cleaning device, wherein the protrusion protrudes radially from the tubular member by a length that is 1.0 to 10 times the diameter of the tubular member.

9. A cleaning method for cleaning the inside of a branch pipe in a building having a standpipe installed in a vertical direction for water supply and drainage, and a branch pipe connected to the standpipe and installed in a horizontal direction, comprising: a tubular member inserting step of inserting a tubular member connected to a water supply device into the inside of the standpipe; a protrusion insertion step of inserting a protrusion protruding from the tubular member, the protrusion being connected to the tubular member and having a discharge port through which the cleaning liquid is discharged, into the branch pipe; a water supply step of starting the water supply device to supply the cleaning liquid; A cleaning method comprising the steps of:

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