JP2013100694A - Drain pipe cleaning method for building having plural stories - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method capable of cleaning a private part drain pipe and a common section vertical drain pipe of a building having a plurality of stories.SOLUTION: A private part drain pipe 71 and a common section vertical drain pipe 72 of a building having a plurality of stories are cleaned by a cleaning tool 1 which is provided with a front head member 25 via a floating guide mechanism 20 at the tip of a rotary nozzle device 10 and to which high pressure water is supplied from a high pressure water generator 60. A rotary two-hole nozzle device with two injecting holes is used as the rotary nozzle device. The cleaning tool, which is configured so that the length of each of the rotary nozzle device, an intermediate guide member 21, and the front head member is shorter than the inner diameter of the common section vertical drain pipe, is inserted from a trap 71a of the private part drain pipe and led through the private part drain pipe and the common section vertical drain pipe, and the private part drain pipe and the common section vertical drain pipe are cleaned by high pressure water injected from the injecting holes.

Description

  In a multi-storey building such as a high-rise apartment building, the present invention provides both a dedicated drainage pipe (horizontal branch pipe) disposed in each room and a common drainage pipe connected to the exclusive drainage pipe. The present invention relates to a cleaning method capable of cleaning.

  In multi-storey buildings such as high-rise apartments, multiple exclusive drainage pipes (horizontal branch pipes) are arranged almost horizontally below the floor of each room. There are provided three types of drainage pipes, a common-use drainage pipe arranged in the horizontal section, and a horizontal main pipe that communicates with the lower end of the common-use drainage pipe and is arranged in a substantially horizontal direction.

  Dirt adheres to the drainage pipes in such multi-storey buildings, but if the dirt is left untreated, there is a risk that the drainage pipes will be blocked. In recent years, with the spread of disposers (garbage disposal equipment), the crushed garbage is sent to the drainage pipe, so the importance of regular drainage pipe cleaning has been reviewed, and reliable cleaning is required. ing.

  A means for cleaning the exclusive drain pipe has been devised so far. (For example, refer patent document 2) Moreover, the means to wash | clean a common use part drainage pipe is also devised (refer patent document 1).

JP 2001-286840 A Japanese Patent Application Laid-Open No. 2006-239637

  In the means described in Patent Document 1, it is a condition to rotate the high-pressure hose, and a special device is required for that purpose. However, the present invention is a means for cleaning the common-use drainage pipe together under the condition that the apparatus is not necessary.

  Since there are few piping forms that can be used for cleaning the common-use drainage stand alone, there are many methods of cleaning the common-use drainage drainage pipe 2 to 3 floors below by inserting a cleaning tool from the exclusive-use drainage trap. However, cleaning of large-diameter common-unit drainage pipes with a thin cleaning device designed to pass through a small-diameter dedicated-part drainage pipe was an uncertain operation.

  The present invention has been devised in view of these problems, and an object of the present invention is to provide a cleaning method that can more reliably clean a common drainage pipe as well as a dedicated drainage pipe of a multi-storey building. In addition, there is provided a cleaning method for removing residue accumulated on the horizontal main pipe connected to the lower end of the common use drainage vertical pipe.

  This will be described with reference to the drawings. The drain pipe cleaning method for a multi-storey building according to claim 1 is a multi-storey building such as a high-rise apartment house, and at least one exclusive drain pipe 71 disposed substantially horizontally below the floor of each room. The high-pressure water from the high-pressure water generator 60 is connected to the common-portion drainage pipe 72 that is connected to the exclusive-portion drain pipe 71 and has a diameter larger than that of the exclusive-portion drain pipe 71 and arranged substantially vertically. This is a method of cleaning with the supplied cleaning tool 1.

  In this cleaning method, a hydraulic rotation advance rotor 34 is rotatably and liquid-tightly supported on a main shaft 30 of a rotary nozzle device 10 connected to a water outlet of a hose 40 for sending pressure water, and has a bottomed cylindrical shape. The bottomed cylindrical portion E is provided with a reduced diameter opening end F for inserting the spherical portion H provided at the tip of the rod-shaped portion G into the portion E and passing the rod-shaped portion G and preventing the spherical portion H from being removed. The cylindrical portion E with a spherical portion projecting from the front portion of the main shaft 30 and the tubular shape by the coupling structure D having a universal shaft shape in which the bottomed tubular portion E is variable in the range of 15 to 45 degrees. The cleaning instrument 1 having the floating guide mechanism 20 configured by connecting the head member with part 25 in a row is pushed into the exclusive drainage pipe 71 from the trap 71a, and downwards at the connection point with the common drainage vertical pipe 72 It is possible to change the angle by its own weight and lower the drainage standpipe 72 in the common area. It is an.

  The drain pipe cleaning method for a multi-storey building according to claim 2 is a multi-storey building such as a high-rise apartment house, and at least one exclusive drain pipe 71 disposed substantially horizontally below the floor of each room. The high-pressure water from the high-pressure water generator 60 is connected to the common-portion drainage pipe 72 that is connected to the exclusive-portion drain pipe 71 and has a diameter larger than that of the exclusive-portion drain pipe 71 and arranged substantially vertically. This is a method of cleaning with the supplied cleaning tool 1.

  In this cleaning method, a two-hole rotary nozzle device 10 having two injection holes 36 and 37 is used as the rotary nozzle device 10, and a spherical portion provided at the tip of the rod-like portion G in the bottomed cylindrical portion E. The bottomed cylindrical portion E is provided with a reduced diameter opening end F for inserting H and passing the rod-shaped portion G and preventing the spherical portion H from being removed. A universal shaft joint-like connection structure D that can be varied in the range of degrees is configured, and a rod-shaped portion G with a spherical portion is projected from the bottom outer surface of the bottomed cylindrical portion E to form an intermediate guide member 21 Then, at least one intermediate guide member 21 is arranged between the spherical portion-attached rod-like portion G and the tubular portion-attached leading member 25 that protrude from the front portion of the main shaft 30 of the rotary nozzle device 10. The guide member 21 and the leading member 25 are connected in series in a row via a joint structure D having a universal shaft joint shape, so that the floating type is possible. Constitute the Ido mechanism 20.

  Then, the cleaning instrument 1 in which the lengths of the rotary nozzle device 10, the intermediate guide member 21, and the leading member 25 are configured to be shorter than the inner diameter of the common-part drainage pipe 72 is the trap of the exclusive-part drainage pipe 71. Inserted from 71a, first passes through the exclusive part drain pipe 71, then guides the intermediate guide member 21 downward by the weight of the leading member 25, passes through the common part drainage pipe 72, and jets from the injection holes 36, 37. The exclusive part drain pipe 71 and the common part drain pipe 72 are washed with the high-pressure jet water W.

  The drainage pipe cleaning method for a multi-storey building according to claim 3 is a multi-storey building such as a high-rise apartment house, and at least one exclusive drainage pipe 71 disposed substantially horizontally below the floor of each room. The high-pressure water from the high-pressure water generator 60 is connected to the common-portion drainage pipe 72 that is connected to the exclusive-portion drain pipe 71 and has a diameter larger than that of the exclusive-portion drain pipe 71 and arranged substantially vertically. This is a method of cleaning with the supplied cleaning tool 1.

  In this cleaning method, a two-hole rotary nozzle device 10 having two injection holes 36 and 37 is used as the rotary nozzle device 10, and a spherical portion provided at the tip of the rod-like portion G in the bottomed cylindrical portion E. The bottomed cylindrical portion E is provided with a reduced diameter opening end F for inserting H and passing the rod-shaped portion G and preventing the spherical portion H from being removed. A universal shaft joint-like connection structure D that can be varied in the range of degrees is configured, and a rod-shaped portion G with a spherical portion projects from the bottom outer surface of the bottomed cylindrical portion E to form an intermediate guide member 21 Then, at least one intermediate guide member 21 is arranged between the rod-shaped portion G with a spherical portion and the head-shaped member 25 with a cylindrical portion protruding from the front portion of the main shaft 30 of the rotary nozzle device 10. The guide member 21 and the leading member 25 are sequentially connected in a line through a universal shaft joint-like connection structure D.

  Then, the cleaning instrument 1 in which the lengths of the rotary nozzle device 10, the intermediate guide member 21, and the leading member 25 are configured to be shorter than the inner diameter of the common-part drainage pipe 72 is the trap of the exclusive-part drainage pipe 71. Inserted from 71 a, first the exclusive part drain pipe 71, then the intermediate guide member 21 is guided downward by the weight of the leading member 25, passed through the common part drainage pipe 72, and injected from the injection holes 36 and 37. The exclusive part drain pipe 71 and the common part drainage pipe 72 are washed with the jet water W.

  Further, a cleaning instrument 50 to which high-pressure water from the high-pressure water generator 60 is supplied as a residue collected in the horizontal main pipe 73 connected to the lower end of the common-use drainage standpipe 72 and disposed in a substantially horizontal direction. Wash with.

  In the drainage pipe cleaning method for a multi-storey building according to the first aspect, the cleaning tool 1 can be inserted from the trap 71a of the exclusive part drainage pipe 71 and inserted into the common part drainage pipe 72 through the exclusive part drainage pipe 71. Therefore, not only the exclusive part drain pipe 71 but also the common part drain pipe 72 can be easily cleaned by the cleaning instrument 1.

  The drain pipe cleaning method for a multi-storey building according to claim 2 uses the cleaning instrument 1 provided with the two-hole rotary nozzle device 10 and the floating guide mechanism 20, so that the cleaning instrument 1 is used as the exclusive part drain pipe 71. The trap 71a is inserted into the common part drainage pipe 72 through the exclusive part drainage pipe 71. Therefore, not only the exclusive part drain pipe 71 but also the common part drainage pipe 72 can be easily cleaned by the cleaning instrument 1. Here, since the two-hole rotary nozzle device 10 with two injection holes 36 and 37 is used as the rotary nozzle device, the conventional rotary nozzle device having three or more injection holes for the exclusive drainage pipe is used. In comparison, the high-pressure jet water W having a high cleaning power can be jetted from the jet holes 36 and 37. Therefore, the common part drainage pipe 72 having a diameter larger than that of the exclusive part drainage pipe 71 can be easily and more reliably cleaned.

  The drain pipe cleaning method for a multi-storey building according to claim 3 exhibits the same effect as the invention according to claim 1. Moreover, the residue collected in the horizontal main pipe 73 connected to the lower end of the common use drainage pipe 72 and disposed in a substantially horizontal direction is removed by the cleaning instrument 50 to which high-pressure water from the high-pressure water generator 60 is supplied. Therefore, the dirt of the three types of drain pipes 70 in the multi-storey building can be more reliably and easily removed using one high-pressure water generator 60.

It is a top view which shows the drain pipe which implements the drain pipe cleaning method which concerns on embodiment of this invention. It is a front view of FIG. In the drain pipe cleaning method which concerns on this embodiment, it is a partial cross section front view which shows the motion of the cleaning instrument in a bending part. It is a partial cross section front view which shows an example of the washing | cleaning instrument used in the drain pipe cleaning method which concerns on this embodiment. It is a fragmentary sectional front view which shows the cleaning method of a horizontal main pipe in the drain pipe cleaning method which concerns on this embodiment. It is a side half sectional view showing a specific example of a cleaning instrument. It is a right view of the cleaning instrument of FIG. FIG. 8 is an LL perspective sectional view of FIG. 7 showing the rotor of the cleaning instrument of FIG. 6.

  First, a basic example of a cleaning tool will be described with reference to FIGS. 6 to 8, the main shaft 30 has a cylindrical shape having a water passage 31 over the central portion in the longitudinal direction, and the latter half portion is connected to the flexible high-pressure hose 40. A hole 32 communicating with the water passage 31 is formed in the peripheral wall of the front half. A flange portion 33 is provided at an intermediate portion of the main shaft 30.

  The rotor 34 is rotatably fitted to the front half of the main shaft 30, and has a space recess 35 that communicates with the water passage 31 through the hole 32 in the central portion of the inner peripheral surface. The stopper 39 is detachably screwed to the front half of the main shaft 30, closes the water passage 31 of the main shaft 30 and prevents the rotor 34 from being pulled out by the flange 38.

  Then, the rotor 34 is given a counterclockwise rotational force and a forward propulsive force to the rotor 34 at an acute inclination angle α (here, 15 ° to 60 °) obliquely rearward from the space recess 35. A main injection passage 36 is provided. Further, a rotational force in the clockwise direction is applied to the rotor 34 at a tilt angle β (20 ° to 90 °) larger than the acute tilt angle α from the space recess 35, and the counterclockwise rotational force is suppressed. A sub-injection passage 37 is provided.

  The bottomed tubular portion E is provided with a reduced diameter opening end F for inserting the spherical portion H provided at the tip of the rod-shaped portion G into the bottomed tubular portion E and passing the rod-shaped portion G and preventing the spherical portion H from being removed. Also, the bottomed cylindrical part E constitutes a universal shaft joint-like connection structure D that is variable in the range of 15 to 45 degrees with respect to the rod-like part G.

  Further, the intermediate guide member 21 is configured by protruding a rod-shaped portion G with a spherical portion on the bottom outer surface of the bottomed cylindrical portion E.

  At least one intermediate guide member 21 is disposed between a rod-shaped portion G with a spherical portion and a leading portion member 25 with a cylindrical portion protruding from the front portion of the stopper 39 of the rotary nozzle device 10, and the main shaft 30 and the intermediate guide member The floating guide mechanism 20 is configured by sequentially connecting the head 21 and the head member 25 in a row via a connecting structure D having a universal shaft joint shape.

  In addition, the lengths of the rotary nozzle device 10, the intermediate guide member 21, and the leading member 25 are configured to be shorter than the inner diameter of the common use drainage pipe 72.

  1 to 5 show an embodiment of a drain pipe cleaning method for a multi-storey building according to the present invention. In this cleaning method, in a multi-storey building such as a high-rise apartment building, a dedicated drainage pipe 71 arranged in a substantially horizontal direction under the floor of each room and a plurality of dedicated drainage pipes 71 communicate with each other. In this method, the common drainage vertical pipe 72 having a diameter larger than that of the drainage pipe 71 and arranged in a substantially vertical direction is cleaned with the cleaning instrument 1 including the leading member 25 at the tip of the rotary nozzle device 10.

  In this cleaning method, the two-hole rotary nozzle device 10 is used as the rotary nozzle device 10 of the cleaning instrument 1, and the floating guide mechanism 20 is used as the guide mechanism. A hose 40 is connected to the base end portion of the cleaning instrument 1, and high-pressure water from the high-pressure water generator 60 is supplied to the cleaning instrument 1 via the hose 40.

  The two-hole rotary nozzle device 10 is provided with two injection holes 36 and 37 at the rear part of the rotor 34, and rotational force and propulsion of the high-pressure jet water W injected from the two injection holes 36 and 37. It advances while rotating as a force, and at the same time, dirt is removed by the high-pressure jet water W.

  A stopper 39 is provided between the two-hole rotary nozzle device 10 and the last guide member 21. The stopper 39 includes a flange portion 38, a rod-like portion G protruding from the tip of the flange portion 38, and a spherical portion H fixed to the tip portion of the rod-like portion G. By fitting the spherical portion H into the bottomed cylindrical portion E of the intermediate guide member 21, the intermediate guide member 21 can be bent.

  Then, the cleaning instrument 1 in which the lengths of the rotary nozzle device 10, the intermediate guide member 21, and the leading member 25 are configured to be shorter than the inner diameter of the common part drainage pipe is inserted from the trap 71 a of the exclusive part drainage pipe 71. Then, the inside of the exclusive part drain pipe 71 and the common part drainage vertical pipe 72 is moved, and the inner peripheral surface of the exclusive part drainage pipe 71 and the common part drainage vertical pipe 72 is cleaned by the high-pressure jet water W sprayed from the injection hole 11. To do.

  The drain pipe cleaning method for a multi-storey building according to the present embodiment can easily clean not only the exclusive part drain pipe 71 but also the common part drain pipe 72. That is, in this cleaning method, since the two-hole rotary nozzle device 10 having the two injection holes 36 and 37 is used, compared with the conventional rotary nozzle device having three or more injection holes for the exclusive drainage pipe, Highly powerful high-pressure jet water W can be jetted from each of the two jet holes 36 and 37. Thereby, since a large propulsive force can be obtained together with a high rotational force, the cleaning instrument 1 includes a bent portion 70a formed in the exclusive drainage pipe 71, an exclusive drainage pipe 71, and a common drainage vertical pipe 72. It is possible to easily pass through the bent portion 70a formed in the connecting portion of the, and reach the common portion drainage pipe 72.

  Further, the common part drainage pipe 72 has a larger inner diameter than the exclusive part drainage pipe 71, but by using the two-hole rotary nozzle device 10, a conventional rotary nozzle having three or more injection holes for the exclusive part drainage pipe is used. Compared with the apparatus, since the highly powerful high-pressure jet water W can be jetted from each of the two jet holes 36 and 37, the high-pressure jet water W is also applied to the inner peripheral surface of the exclusive part drain pipe 71 with high cleaning power. It can be made to collide. Thereby, the stain | pollution | contamination of the exclusive part drain pipe 71 can also be removed reliably. As a result, not only the exclusive drainage pipe 71 but also the shared drainage pipe 72 can be easily and reliably washed.

  In this cleaning method, since the floating guide mechanism 20 is used, each guide member 21 can be tilted not only in the vertical and horizontal directions but also in all directions. Therefore, the cleaning instrument 1 can easily pass through the bent portion 70a.

  Further, the floating guide mechanism 20 includes a leading member 25 at the tip portion thereof, and the leading member 25 has a spherical surface 26 at the tip portion, and in the same manner as the intermediate guide member 21 in all directions. Can tilt. Thereby, after inserting the cleaning instrument 1 into the exclusive part drain pipe 71, the leading end of the leading member 25 first enters the exclusive part drain pipe 71, and then the intermediate guide member 21 is bent downward by its own weight. When it is guided downward and comes into contact with the inner peripheral surface of the common part drainage pipe 72, its tip is a spherical surface 26, so that it smoothly tilts while moving so as to slide on the inner peripheral surface. Accordingly, the intermediate guide member 21 also tilts smoothly. As a result, the cleaning instrument 1 can smoothly advance along the inner peripheral surfaces of the exclusive part drain pipe 71 and the common part drainage standpipe 72, and thus can easily pass through the bent part 70a.

  In order to confirm the cleaning result of the cleaning method according to the present embodiment, the present inventors conducted an experiment under the following conditions (Table 1). The injection amount and pressure of the high-pressure jet water W were set in accordance with the maximum operating pressure / flow rate limit of the flexible hose 40 that is normally used for cleaning the drain pipe 70. The flexible hose is made of special urethane.

  In addition, the internal diameter of the exclusive part drain pipe 71 is 50 mm, and the internal diameter of the common part drainage standpipe 72 is 100 mm. The exclusive part drain pipe 71 and the common part drain pipe 72 are generally used.

  From this experiment, the results in Table 2 were obtained.

  As can be seen from the experimental results, the non-rotating nozzle device having 8 injection holes in the rear part and the rotating nozzle device having 3 to 4 injection holes as described in Patent Document 2 However, the cleaning ability of the common use drainage pipe 72 is low.

  In addition, this embodiment uses a non-rotating nozzle device having eight injection holes in the rear part and a rotary nozzle device having three to four injection holes to clean the common part drainage pipe 72. As in the case of using the two-hole rotary nozzle device 10 according to the above, it is conceivable to increase the injection amount of the high-pressure jet water and the pressure of the high-pressure water in order to remove it almost completely. However, such means cannot be adopted because it exceeds the maximum operating pressure and flow rate limit of the flexible hose 40. Moreover, it is not preferable to use a flexible hose having a large inner diameter (and hence an outer diameter) because it cannot easily pass through the dedicated drainage pipe 71 having a small inner diameter or the bent portion 70a that is tortuous.

  Moreover, in the means described in Patent Document 1, in order to clean the inside of the common-part drainage pipe uniformly, it is a condition that the high-pressure hose is rotated, and therefore a special device is required. However, the present invention does not require that device. The common area drainage pipe can be cleaned simply by controlling the cleaning equipment, operating pressure, and insertion speed of the cleaning equipment.

  The removed dirt of the exclusive part drain pipe 71 and the common part drainage standpipe 72 accumulates as a residue in the horizontal main pipe 73. In this embodiment, the residue has an inner diameter of 9.5 mm and an outer diameter of 16.1 mm. A non-rotating nozzle device having 6 to 8 injection holes at the rear end of the hose 40 having a length of 30 m, and a rotary type having 3 to 4 injection holes as described in Patent Document 2. It was confirmed that it can be removed by the cleaning instrument 50 including the nozzle device 10 (the cleaning instrument 50 is inserted from the inspection port of the horizontal main pipe 73). The inner diameter of the horizontal main pipe 73 is 150 mm. Thus, in this embodiment, after washing the exclusive part drain pipe 71 and the common part drainage standpipe 72, the residue of the horizontal main pipe 73 can be easily removed by the cleaning instrument 50 described above.

DESCRIPTION OF SYMBOLS 1 Cleaning implement 10 Rotating nozzle apparatus 20 Floating guide mechanism 21 Intermediate guide member 25 Leading member 26 Spherical surface 30 Main shaft 31 Water passage 32 Hole portion 33 Flange portion 34 Rotor 35 Spatial recess portion 36 Main injection passage 37 Sub injection passage 38 Rift portion 39 Stopper 40 Hose 50 Cleaning instrument 60 High pressure water generator 70 Drain pipe 70a Bending part 71 Exclusive part drain pipe 71a Trap 72 Common part drainage vertical pipe 73 Horizontal main pipe D Connection structure E Bottomed cylindrical part F Reduced diameter opening G Rod-like part H Spherical part W High pressure water

Claims (3)

  In a multi-storey building such as a high-rise apartment building, the exclusive drainage pipe (71) arranged substantially horizontally below the floor of each room communicates with at least one of the exclusive drainage pipes. A common part drainage standpipe (72) having a diameter larger than that of the pipe and arranged in a substantially vertical direction is washed with a cleaning instrument (1) to which high-pressure water from a high-pressure water generator (60) is supplied. A hydraulic rotation advance rotor (34) is rotatably and liquid-tightly supported on a main shaft (30) of a rotary nozzle device (10) connected to a water outlet of a hose (40) for sending pressure water, Also, the bottomed cylindrical part (E) has a rounded diameter opening end (F) for placing the spherical part (H) provided at the tip of the rod-like part (G) and passing the rod-like part and retaining the spherical part. Freely provided in the cylindrical part, with the bottomed cylindrical part being variable in the range of 15 to 45 degrees with respect to the rod-shaped part. From the trap (71a), the cleaning tool is configured by connecting the rod-shaped portion with a spherical portion and the head-shaped member with a cylindrical portion (25) protruding from the front portion of the main shaft by the coupling-shaped connection structure (D). A drainage pipe cleaning method for a multi-storey building, wherein the drainage drainage pipe is pushed into an exclusive drainage pipe, turned downward by its own weight at the connection point with the common drainage pipe, and the common drainage pipe is lowered.   In a multi-storey building such as a high-rise apartment building, the exclusive drainage pipe (71) arranged substantially horizontally below the floor of each room communicates with at least one of the exclusive drainage pipes. A common part drainage standpipe (72) having a diameter larger than that of the pipe and arranged in a substantially vertical direction is washed with a cleaning instrument (1) to which high-pressure water from a high-pressure water generator (60) is supplied. As a rotary nozzle device, a two-hole rotary nozzle device (10) having two injection holes (36, 37) is used, and provided at the tip of the rod-like portion (G) in the bottomed cylindrical portion (E). The bottomed cylindrical portion is provided with a reduced diameter opening end (F) for inserting the spherical portion (H) and passing the rod-shaped portion and preventing the spherical portion from being removed. Consists of a universal shaft coupling structure (D) that can be bent in a range of up to 45 degrees, and on the bottom outer surface of the bottomed cylindrical part A rod-shaped portion with a convex portion is provided to form an intermediate guide member (21), and a rod-shaped portion with a spherical portion and a leading portion member with a cylindrical portion (25) which are projected on the front portion of the main shaft (30) of the rotary nozzle device. At least one intermediate guide member is arranged between the main shaft, the intermediate guide member, and the leading member, and is sequentially connected in a row through a universal shaft joint-like connection structure. And the length of each of the leading members is shorter than the internal diameter of the common drainage standpipe, and the cleaning implement is inserted from the trap (71a) of the exclusive drainage pipe. Then, the intermediate guide member is guided downward by the dead weight of the leading member, passed through the common part drainage vertical pipe, and the exclusive part drainage pipe and the common part drainage vertical pipe are washed with the high-pressure jet water (W) injected from the injection hole. Drainage pipe cleaning method for multi-storey buildings   In a multi-storey building such as a high-rise apartment building, the exclusive drainage pipe (71) disposed substantially horizontally below the floor of each room communicates with at least one exclusive drainage pipe, and the exclusive drainage A method of cleaning a common drain drainage pipe (72) having a diameter larger than that of the pipe and arranged in a substantially vertical direction with a cleaning instrument (1) to which high-pressure water from a high-pressure water generator (60) is supplied In this case, a two-hole rotary nozzle device having two injection holes (36, 37) is used as the rotary nozzle device (10), and the rod-like portion (G) is inserted into the bottomed cylindrical portion (E). The bottomed cylindrical portion is provided with a reduced diameter opening end (F) for inserting the provided spherical portion (H) and passing the rod-shaped portion and preventing the spherical portion from being removed. Consists of a universal shaft joint structure (D) that can be bent in the range of 15 to 45 degrees, and the bottom outer surface of the bottomed tubular portion An intermediate guide member (21) is formed by projecting a rod-shaped portion with a spherical portion, and a rod-shaped portion with a spherical portion and a leading member with a cylindrical portion projecting on the front portion of the main shaft (30) of the rotary nozzle device (25). At least one intermediate guide member is arranged between the main shaft, the intermediate guide member, and the leading member, and is sequentially connected in a row through a universal shaft joint-like connection structure. And inserting the cleaning tool in which the length of each of the leading members is shorter than the inner diameter of the common part drainage pipe from the trap (71a) of the exclusive part drainage pipe, Then, the intermediate guide member is guided downward by the dead weight of the leading member, passed through the common part drainage standpipe, and the exclusive part drainage pipe and the common part drainage standpipe are washed by the high pressure spray water (W) sprayed from the jet hole. The common part is connected to the lower end of the drainage standpipe Drainage pipes for multi-storey buildings, characterized in that residues collected in a horizontal main pipe (73) arranged in a horizontal direction are removed by a cleaning instrument (50) to which high-pressure water from the high-pressure water generator is supplied. Cleaning method.

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