Bathroom drain repair method and pipe material for repair

Abstract

To provide a method for renovating a bathroom drain port, which can make common function restoration work of the outflow channel around the main body of the trap and connection work to the outflow channel of the unit drain pipe for bathroom unitization as much as possible.SOLUTION: A method for renovating a bathroom drain port includes an inner cylindrical part removing step to remove an inner cylindrical part 21c of a trap body 21, an inner mounting step to insert an inner pipe 34, which serves as a flow path, into a direct connection pipe 12 connected to the trap body 21, while leaving the upper part thereof, and maintaining watertightness, and an outer mounting step to fit an outer pipe 36 corresponding to the inner cylindrical part 21c to the outer peripheral surface of the inner pipe 34 and fix it to a bottom plate part 21a. The outer pipe 36 is configured to be connectable with a union joint 61 that connects a unit drain pipe 63, and the inner pipe 34 is formed to have substantially the same diameter as the unit drain pipe 63.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bathroom drain repair method and a regeneration pipe material that enable the function of the outflow flow path around the trap body of a bathroom drain trap to be restored, and also enable the connection of a unit drain pipe to the outflow flow path when the bathroom is unitized. [Background technology]

[0002] Conventionally, a method for repairing this type of drain trap to restore its function has been known (see Patent Document 1). Also known is a drain pipe connection structure that uses this type of drain trap as a slab-penetrating sleeve (see Patent Document 2). The former drain trap repair method is for a drain trap consisting of a rising portion rising from the center bottom of the main body, a water seal cap located above the rising portion, and a drain pipe connected below the rising portion, and consists of a cutting-off process to cut off the rising portion, a grinding and polishing process to remove dirt adhering to the inside of the drain trap, a cleaning and drying process to clean and dry the inside of the drain trap, a rust-proofing process to rust-proof the inside of the drain trap, and a process to form a restored rising portion by attaching a repair member formed of a plastic cylindrical body after the rust-proofing process.In this case, the repair member is a plastic pipe cut to a specified length with a ring-shaped stopper integrally attached to the middle part, and the repair member is inserted and attached to the drain pipe so that this stopper abuts the remaining cut-off part of the rising portion. The latter drain pipe connection structure uses a slab penetration unit that includes a pipe connection fitting with a pipe joint that extends upward from the pipe insertion fitting, and an adjustable short pipe that connects the pipe connection fitting to the L-shaped fitting and is configured to be adjustable in length. The lower part of this slab penetration unit is inserted and glued from the trap body to the existing drain pipe, and the upper part is connected to the horizontal drain pipe from the bathroom unit. This connects the unit drain pipe of the bathroom unit to the trap body, and the trap body is used as a slab penetration sleeve. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5401436 [Patent Document 2] Patent Publication No. 2021-46700 Summary of the Invention [Problem to be solved by the invention]

[0004] In older apartment buildings, some of which are around 50 years old, tiled bathrooms are often renovated into bathroom units (unit baths). In particular, in rental apartment buildings, it is preferable to renovate bathrooms into units when any one of the units becomes vacant. The latter conventional technology allows for renovations to be made on a unit-by-unit basis when a room becomes vacant, and by utilizing existing floor drain traps, it is advantageous in terms of cost and construction time. However, many of these types of floor drain traps (bowl traps) are corroded, and so, apart from the conversion of bathrooms into units, floor drain trap (trap surroundings) rehabilitation work is sometimes carried out as part of drain pipe renovation work. In the former conventional technology, by preparing cylindrical repair parts, rehabilitation work can be carried out easily and in a short time. In this way, the floor drain trap rehabilitation method and the unit drain connection method are individually technically superior. However, if the timing is not met, problems can arise. For example, if the floor drain trap is rehabilitated before the bathroom unit is renovated, the repair member inserted into the drain pipe can get in the way during the bathroom unit renovation, making it difficult to use the floor drain trap as a slab-penetrating sleeve.

[0005] The objective of the present invention is to provide a bathroom drain repair method and regeneration pipe material that can share, as much as possible, the work to restore the functionality of the outflow flow path around the trap body and the work to connect the unit drain pipe to the outflow flow path when the bathroom is unitized. [Means for solving the problem]

[0006] The bathroom drain renovation method of the present invention is a bathroom drain renovation method that allows the function of the outflow flow path around the trap body of the bathroom drain trap to be restored and allows the connection of a unit drain pipe to the outflow flow path when the bathroom is unitized.The method includes an inner tube removal process for removing the inner tube of the trap body, which has a bottom plate portion, an outer tube portion extending upward from the outer peripheral end of the bottom plate portion, an inner tube portion extending upward from the inner peripheral end of the bottom plate portion, and a connecting thread portion extending downward from the inner peripheral end of the bottom plate portion; an inner fitting process for inserting the inner pipe that serves as the outflow flow path, leaving the upper part, into a direct connecting pipe that has a connecting short pipe connected to the connecting thread portion and a drain fitting connected to the connecting short pipe, and maintaining the inserted state while maintaining watertightness; and an outer fitting process for fitting an outer pipe corresponding to the inner tube portion to the outer peripheral surface of the inner pipe and fixing it to the bottom plate portion.The outer pipe is configured to be connectable to a union fitting for connecting the unit drain pipe, and the inner pipe is formed to approximately the same diameter as the unit drain pipe.

[0007] According to this configuration, by inserting the inner pipe into the direct-underflow connecting pipe and maintaining the inner pipe inserted in the direct-underflow connecting pipe while maintaining watertightness, repair of the direct-underflow connecting pipe and formation of a new outflow flow path can be performed simultaneously. Moreover, since the inner pipe is formed to have approximately the same diameter as the unit drain pipe, drainage performance is not impaired after repair. In addition, by fitting an outer pipe that can be connected to a union fitting and that corresponds to the inner cylindrical portion onto the outer surface of the inner pipe and fixing it to the bottom plate portion, it is possible to connect a unit drain pipe to this part via a union fitting, and it is also possible to set a bowl in this part to restore the function of the bathroom drain trap. In this way, the renovation work to connect the unit drain pipe and the renovation work to restore the functionality of the bathroom drain trap can be performed as commonly as possible. Therefore, by placing a bowl on the outer pipe and attaching a strainer to the trap body, the functionality of the bathroom drain trap can be restored, and by connecting the unit drain pipe to the outer pipe via a union joint, the bathroom unit can be drained. Furthermore, after the functionality of the bathroom drain trap has been restored (renovation work), simply removing the bowl and strainer allows the unit drain pipe to be connected (renovation work).

[0008] In this case, in the inner fitting step, it is preferable to fill a gap between the inserted inner pipe and the direct-under connecting pipe with a filler to maintain the inserted state while maintaining watertightness.

[0009] According to this configuration, the filled filler can firmly support the inner pipe to the direct-downward connecting pipe, and can reliably prevent water leakage from the inner pipe to the direct-downward connecting pipe. Before the inner fitting process, it is preferable to remove rust, bumps, etc. from the inner circumferential surfaces of the trap body and the direct connecting pipe (polishing process). It is also preferable to use a waterproofing agent with weak adhesive strength and low viscosity as the filler.

[0010] In addition, in the inner fitting process, a pipe setting jig is used which holds the inner pipe from the inside, enabling it to be inserted into the direct connecting pipe, and which enables the tip of the inner pipe to be sealed between the direct connecting pipe, and the inner pipe is inserted into the direct connecting pipe so that the tip reaches the drainage joint, and the tip of the inner pipe is sealed between the drainage joint, and in this state, the filler is filled, and after the filled filler has hardened, it is preferable to pull out the pipe setting jig from the inner pipe.

[0011] According to this configuration, by using the pipe setting jig, the insertion and setting of the inner pipe, whose tip reaches the drainage joint, into the direct connecting pipe and the filling of the filler into the gap between the inner pipe and the direct connecting pipe can be performed accurately and efficiently, thereby improving work efficiency. In particular, the pipe setting jig can seal the tip of the inner pipe with the drainage joint, preventing the filler from getting into the inner pipe and improving workability.

[0012] In addition, in the inner fitting process, it is preferable that the filler that has been temporarily stored on the bottom plate portion of the trap body is poured into the gap between the inner pipe and the directly below connecting pipe to fill it, and after the filler has hardened, the remaining filler on the bottom plate portion is removed by peeling it off.

[0013] This configuration allows the gap between the inner pipe and the direct-connecting pipe to be filled with filler reliably and efficiently. Furthermore, the remaining filler can be easily removed, thereby improving work efficiency.

[0014] It is also preferable to further include a coating step between the inner fitting step and the outer fitting step, in which a coating agent is applied to the inner circumferential surface of the trap body.

[0015] According to this configuration, the coating on the inner peripheral surface of the trap body can suppress the progression of corrosion in the trap body.

[0016] Furthermore, it is preferable that the outer pipe has a flange portion at one end, and the outer fitting process includes a first fixing process in which a high-viscosity adhesive is used to adhere the outer pipe to the outer surface of the inner pipe with the flange portion seated on the bottom plate portion, and a second fixing process in which a low-viscosity adhesive is poured onto the bottom plate portion so that the flange portion is submerged, and then allowed to harden.

[0017] With this configuration, the outer pipe and inner pipe can be integrated using a high-viscosity adhesive. Furthermore, the outer pipe can be firmly bonded to the bottom plate via the flange using a low-viscosity adhesive, integrating the outer pipe and the trap body. This allows the unit drain pipe to be directly connected to the direct-connection pipe using the trap body. This means that the trap body can be used as a solid pipe sleeve that penetrates the slab.

[0018] In this case, in the first fixing step, it is preferable to apply putty to the portion where the flange portion is to be seated on the bottom plate portion before seating the flange portion, and then seat the flange portion while crushing the applied putty so that the outer pipe is in a vertical position.

[0019] This configuration allows the outer pipe to be attached vertically to the trap body and inner pipe. Therefore, the unit drain pipe can be properly connected to the outer pipe attached to the trap body via a union joint. Even if the outer pipe is made of metal for strength, the putty can insulate the trap body from the outer pipe, effectively preventing galvanic corrosion between the dissimilar metals.

[0020] Furthermore, it is preferable that the inner pipe protrudes slightly upward relative to the outer pipe, and an annular socket is provided for attachment to this protruding portion, and that after the outer attachment step, a socket attachment step is further provided in which the inner surface of the annular socket is adhered to the outer surface of the protruding portion of the inner pipe with the lower end of the annular socket abutting the upper end of the outer pipe.

[0021] With this configuration, the outer pipe and the inner pipe are bonded to each other via the annular socket, and as a result, the inner pipe is integrated with the trap body and is supported immovably by the outer pipe, thereby facilitating integration of the outer pipe and the trap body.

[0022] The rehabilitation pipe material of the present invention is a rehabilitation pipe material that is installed in place of the inner tube part to rehabilitate the outflow flow path of a bathroom drain outlet, which has an outflow flow path formed by an inner tube part extending upward from the inner end of the bottom plate part of the trap body and a direct connecting pipe connected to the trap body and continuing to the inner tube part.It comprises an inserted pipe part that is inserted into the direct connecting pipe, a connecting pipe part that also serves as the inner tube part and is configured to be able to connect a unit drain pipe associated with the unitization of the bathroom via a union fitting, and a flange part that is provided at the boundary between the inserted pipe part and the connecting pipe part and seats on the bottom plate part, and is characterized in that the outflow flow path is formed by the inner surface of the inserted pipe part and the inner surface of the connecting pipe part, and the joint margin of the union fitting is formed by the outer surface of the connecting pipe part.

[0023] Another bathroom drain renovation method of the present invention is a bathroom drain renovation method that uses the above-mentioned rehabilitation pipe material to restore the function of the outflow flow path around the trap body and enable the connection of a unit drain pipe to the outflow flow path when the bathroom is unitized, and is characterized by comprising: an inner tube removal process for removing the inner tube portion; a setting process for inserting the insertion pipe portion into the direct connecting pipe and setting the rehabilitation pipe material so that the flange portion is seated on the bottom plate portion; a filling process for filling the gap between the inserted insertion pipe portion and the direct connecting pipe with filler; and a fixing process for fixing the flange portion to the bottom plate portion.

[0024] According to these configurations, by inserting the insertion pipe section into the direct-below connecting pipe and filling the gap between the insertion pipe section and the direct-below connecting pipe with filler, it is possible to simultaneously repair the direct-below connecting pipe and form a new outflow flow path. In addition, by fixing the connecting pipe part that can be connected to a union fitting and that corresponds to the inner tube part to the bottom plate part via the flange part, it is possible to connect a unit drain pipe to this part via the union fitting, and it is also possible to set a bowl on this part to restore the function of the bathroom drain trap. In this way, the renovation work to connect the unit drain pipe and the renovation work to restore the functionality of the trap body can be performed as commonly as possible. Therefore, by placing a bowl on the connecting pipe and setting a strainer on the trap body, the functionality of the trap body can be restored, and by connecting the unit drain pipe to the connecting pipe via a union joint, the bathroom unit can be drained. Furthermore, after the functionality of the trap body has been restored (renovation work), simply removing the bowl and strainer allows the unit drain pipe to be connected (renovation work). [Brief explanation of the drawings]

[0025] [Figure 1] 1A and 1B are cross-sectional views of a bathroom drain outlet according to a first embodiment, showing a cross-sectional view before repair (a) and a cross-sectional view after repair (b). [Figure 2] FIG. 2 is a side view of the inner pipe according to the embodiment. [Figure 3] FIG. 2 is a perspective view of an outer pipe according to the embodiment. [Figure 4] FIG. 2 is a cross-sectional view of an annular socket according to an embodiment. [Figure 5] 1A is a diagram showing the inner cylinder removing step and FIG. 1B is a diagram showing the polishing step in the bathroom drain renovating method according to the first embodiment. [Figure 6] 10(c) is a diagram showing the pipe insertion process (inner fitting process) and FIG. 10(d) is a diagram showing the filling process (inner fitting process) in the bathroom drain renovation method according to the first embodiment. [Figure 7] 10(e) is a diagram showing the coating step in the bathroom drain renovation method according to the first embodiment, and FIG. 10(f) is a diagram showing the first fixing step (outer attachment step). [Figure 8] 10(g) is a diagram showing the second fixing step (outer fitting step) and FIG. 10(h) is a diagram showing the socket fitting step in the bathroom drain renovation method according to the first embodiment. [Figure 9]This is a cross-sectional view (a) of the state after the bathroom drain renovation method of the first embodiment has been carried out, where the bowl trap has been rehabilitated, and a cross-sectional view (b) of the state after the drain connection has been made using the bowl trap. [Figure 10] This is a cross-sectional view of the bathroom drain outlet after repair in accordance with the second embodiment. [Figure 11] FIG. 10 is a cross-sectional view of a half portion of a rehabilitation pipe material according to a second embodiment. [Figure 12] 10A is a diagram showing the setting process and FIG. 10B is a diagram showing the filling process in the bathroom drain renovation method according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, a method for renovating a bathroom drain according to one embodiment of the present invention will be described with reference to the accompanying drawings. For example, in old apartment buildings built around 50 years ago, tiled bathrooms are renovated into bathroom units (unit baths). Separately from or in conjunction with this renovation work, work is also carried out to rehabilitate aging drainage pipes, including standpipes. In this type of bathroom, a cast-iron bowl trap is installed embedded in the slab, and the drain pipe connected to the bowl trap penetrates the slab, is laid horizontally in the ceiling of the floor below, and is connected to the drainage standpipe.

[0027] In bathroom renovation work, since the unit itself has a built-in trap, the existing bowl trap is used like a solid pipe sleeve to direct the bathroom unit's wastewater to the drain standpipe. Also, in drain pipe rehabilitation work, the bowl trap and the drain pipe connected to it, the part embedded in the slab, are repaired while leaving the existing part intact, and the other parts are replaced. In this way, the bathroom renovation work and the drain pipe rehabilitation work are considered separate works, but there is overlap in the bowl trap part.

[0028] For this reason, if bathroom renovation work is carried out before drain pipe rehabilitation work, no waste will be generated, but if drain pipe rehabilitation work is carried out before bathroom renovation work, waste will be generated. In other words, if the drain pipes become increasingly deteriorated and drain pipe rehabilitation work is unavoidable, when the bathroom renovation work is carried out, not only will the bowl trap rehabilitation work end up being wasted work, but the bowl trap renovation work to connect the new bathroom drain pipe to the existing drain pipe will be time-consuming. Therefore, in this embodiment, the bowl trap rehabilitation work and the bowl trap renovation work for drain connection are made as common as possible, making it easy to handle either case, regardless of whether the rehabilitation work or the renovation work is carried out first.

[0029] [First embodiment] Figure 1(a) is a cross-sectional view of the bathroom drain outlet before renovation, and Figure 1(b) is a cross-sectional view of the bathroom drain outlet after renovation. As shown in both figures, the bathroom drain outlet 10 has a bowl trap 11 (bathroom drain trap) as its main component and a direct-down connection pipe 12 connected to the bowl trap 11. Needless to say, the bowl trap 11 and the direct-down connection pipe 12 are existing components, and due to aging, rust, bumps, etc. have appeared in various parts. The bowl trap 11 is embedded in the slab S, and the direct-down connection pipe 12 penetrates the slab S and is piped into the space below the slab S. The underside of the slab S is the ceiling surface (vertical ceiling) of the floor below, and the direct-down connection pipe 12 is connected to a drainage standpipe (not shown) via a horizontal drain pipe 13 in this ceiling area.

[0030] As shown in FIG. 1(a), the bowl trap 11 comprises a trap body 21 with a brim-shaped waterproof presser 26 formed on the top, a bowl 22 provided within the trap body 21 so as to cover it, a strainer support 23 extending upward from the trap body 21, and a strainer 24 detachably attached to the strainer support 23. The trap body 21 is embedded in a slab S with the waterproof layer WP held down by the waterproof presser 26. The strainer support 23 is screwed to the trap body 21 (setscrews) so that its height can be adjusted to match the thickness of the cinder concrete CC on the waterproof layer WP. Furthermore, the trap body 21 is formed with multiple drainage holes 27 located above the waterproof presser 26 to guide water leaking onto the waterproof layer WP into the trap body 21.

[0031] Trap body 21 is integrally formed (made of cast iron) from bottom plate 21a, outer cylinder 21b extending upward from the outer peripheral edge of bottom plate 21a, inner cylinder 21c extending upward from the inner peripheral edge of bottom plate 21a, connecting thread 21d extending downward from the inner peripheral edge of bottom plate 21a, and waterproof retainer 26 extending laterally from the top of outer cylinder 21b. Direct-down connection pipe 12 is threadedly connected (drained) to connecting thread 21d, which is threaded with an internal thread. Between inner cylinder 21c and bowl 22 placed over it, water sealing section 28, which performs the main function of bowl trap 11, is formed. That is, the wastewater flowing in from the strainer 24 flows down between the outer cylindrical portion 21b and the bowl 22, passes through the water sealing portion 28 from below, and flows down into the outflow channel 29 which is the inner circumferential surface of the inner cylindrical portion 21c.

[0032] The direct connection pipe 12 is made of carbon steel pipe (white gas pipe) for piping and includes a short connection pipe 31 connected to the connection thread portion 21d of the trap body 21 and an L-shaped joint 32 (drain joint) connected to the lower end of the short connection pipe 31. A horizontal drain pipe 13 is connected to the L-shaped joint 32, and the downstream end of the horizontal drain pipe 13 is connected to a drain standpipe (not shown). The inner circumferential surfaces of the short connection pipe 31 and the inner circumferential surface of the inner cylindrical portion 21c form a direct outflow passage 29. Around this outflow passage 29, rust is likely to develop in three locations: the entire inner cylindrical portion 21c in contact with the water seal portion 28, the threaded joint between the connection thread portion 21d and the short connection pipe 31, and the threaded joint between the short connection pipe 31 and the L-shaped joint 32. Therefore, we will focus on these three locations to restore the functionality of the bowl trap 11.

[0033] As shown in Figure 1(b), in the repair method of this embodiment, the inner cylindrical portion 21c is removed, and an inner pipe 34 is installed from this portion to the connecting short pipe 31 to form a new outflow flow path 29. In addition, an outer pipe 36 is installed in place of the removed inner cylindrical portion 21c, and an annular socket 38 is provided at the upper end of the outer pipe 36 and the inner pipe 34. As will be described in detail later, the inner pipe 34 forms the new outflow flow path 29 on its inner surface, and the outer pipe 36 forms the joint portion with the unit drain pipe 63 on its outer surface (see Figure 9(b)).

[0034] Next, we will explain how to renovate the bathroom drain 10, but before that, we will explain the inner pipe 34, outer pipe 36 and annular socket 38.

[0035] [Inner pipe] As shown in Figure 2, the inner pipe 34 is a simple cylindrical polyvinyl chloride pipe, a thin (custom-made) item developed for insertion and installation inside the connecting short pipe 31. The bowl trap 11 has a typical nominal diameter of 50A, but the inner cylindrical portion 21c, which should have an inner diameter of 50 mm, not only varies in shape depending on the manufacturer, but also lacks precision in its inner diameter. Therefore, in this embodiment, the inner cylindrical portion 21c is removed and the inner pipe 34 inserted therein has a diameter corresponding to the connecting short pipe 31, which is a standard white gas pipe. As a result, the inner pipe 34 can be used regardless of the manufacturer.

[0036] Specifically, the outer diameter of the inner pipe 34 is 52 mm, slightly smaller than the inner diameter of the connecting short pipe 31, which is 52.9 mm, and the inner diameter is 48 mm with a wall thickness of 2 mm. The actual connecting short pipe 31 has a smaller diameter than the standard size due to rust, bumps, etc., but a polishing process (described later) results in an inner diameter of approximately 54 mm when the inner pipe 34 is inserted, leaving a gap of approximately 1 mm between the inner diameter of the connecting short pipe 31 and the outer diameter of the inner pipe 34. As will be described in detail later, this gap is filled with a waterproofing agent 45, and the connecting short pipe 31 is renovated by this waterproofing agent 45 and the inner pipe 34.

[0037] Meanwhile, the length of the inner pipe 34 is the dimension from the upper end of the inner cylindrical portion 21c to the joint end of the L-shaped joint 32, and is measured on-site for each bowl trap 11 and cut out from a standard length of PVC raw pipe (not shown). Therefore, the lower end of the inner pipe 34 inserted into the connecting short pipe 31 reaches almost the joint end of the L-shaped joint 32, and the upper end is positioned somewhat higher than the upper end of the removed inner cylindrical portion 21c. In other words, the upper part of the inner pipe 34 protrudes from the bottom plate portion 21a inside the trap body 21.

[0038] [Outer pipe] 3, the outer pipe 36 is a short pipe made of stainless steel and is integrally formed with a main body pipe section 36a and a flange section 36b attached to the lower end of the main body pipe section 36a. The outer pipe 36 is attached to the trap body 21 in such a manner that the main body pipe section 36a fits onto the outer peripheral surface of the upper part of the inner pipe 34 and the flange section 36b sits on the bottom plate section 21a after the inner cylinder section 21c has been removed.

[0039] The cylindrical main pipe portion 36a is the portion to which a short union 61 (MD joint) described later is attached, and a unit drain pipe 63 can be connected to the outer pipe 36 via this short union 61 (see FIG. 9(b)). For this reason, the outer diameter of the outer pipe 36 (main pipe portion 36a) is formed to be the same diameter (60.5 mm) as the outer diameter of the unit drain pipe 63. Furthermore, the inner diameter of the outer pipe 36 is 52.9 mm, which is slightly larger than the outer diameter (52 mm) of the inner pipe 34, since it is fitted and bonded to the inner pipe 34, and the gap of approximately 0.5 mm that occurs between them becomes the application space (filling space) for the first adhesive 47 described later.

[0040] As will be described in detail later, the flange portion 36b is seated on the bottom plate portion 21a via epoxy putty 55, and at this time, the position of the outer pipe 36 is adjusted so that it is in a vertical position while compressing the applied epoxy putty 55 (see FIG. 7(f)). This position adjustment is performed within the range allowed by the above-mentioned gap of approximately 0.5 mm.

[0041] [Annular socket] As shown in Figure 4, the annular socket 38 is attached to the upper ends of the inner pipe 34 and the outer pipe 36, integrating the inner pipe 34 and the outer pipe 36. That is, the annular socket 38, the inner pipe 34, and the outer pipe 36 form an integrated composite pipe section 15, and the unit drain pipe 63 is connected to this composite pipe section 15 via the above-mentioned short union 61. Furthermore, as will be described in detail later, this composite pipe section 15 is fixed to the bowl trap 11 (bathroom drain 10) at the outer pipe 36, so it functions like a solid pipe sleeve for the slab S, and the unit drain pipe 63 is connected to the direct connecting pipe 12 via the composite pipe section 15.

[0042] The protruding dimension of the composite pipe section 15, including the annular socket 38, is slightly longer than the original inner cylinder section 21c to ensure a sufficient joint length with the short union 61. As a result, the bowl 22 set therein is set at a higher position within the trap body 21 than before the renovation. However, since the sealing depth in the water sealing section 28 is determined by the height dimension of the bowl 22 side, the water sealing function of the bowl trap 11 is not impaired.

[0043] The annular socket 38 is a short cylinder made of vinyl chloride and is integrally formed with a joint end 38a having an annular chamfered portion 38b at its inner tip, and a joint body portion 38d that is connected to the joint end 38a with an inner annular step portion 38c. The upper end of the inner pipe 34 is bonded to the inside of the joint body portion 38d with the lower end of the joint body portion 38d abutting against the upper end of the outer pipe 36. In this case, the inner diameter of the joint end 38a is the same as the inner diameter of the inner pipe 34 (48 mm), and the outer diameter from the joint end 38a to the joint body portion 38d (annular socket 38) is the same as the outer diameter of the outer pipe 36 (60.5 mm).

[0044] As will be described in detail later, an adjustment short pipe 67, which is part of the unit drain pipe 63, is connected to this composite pipe section 15 via a short union 61. In this case, the inner diameter of the adjustment short pipe 67 is 52.9 mm, and the corresponding inner diameter of the inner pipe 34 (and the joint end 38a of the annular socket 38) is 48 mm. Therefore, the drainage water from the unit drain pipe 63 flows into the inner pipe 34, which is narrowed by about 5 mm (2.5 mm in thickness). In connection with this, the joint end 38a of the annular socket 38 in this embodiment has an annular chamfered portion 38b with a thickness of approximately 2.5 mm, which allows the drainage water from the unit drain pipe 63 to flow smoothly downward.

[0045] The flow path area of ​​the new outflow flow path 29 (diameter 48 mm) formed by the inner pipe 34 is approximately 80% of the flow path surface of the existing outflow flow path 29 (diameter 52.9 mm) formed by the connecting short pipe 31. However, it has been confirmed through experiments that this 80% does not impair the drainage capacity of the unit drain pipe 63. Furthermore, the inner pipe 34, outer pipe 36 and annular socket 38 may be made of metal or resin.

[0046] [Renovation method] Next, with reference to Figures 5 to 8, a method for repairing the bathroom drain outlet 10 using the inner pipe 34, outer pipe 36, etc. will be described step by step. This repair method includes an inner tube removal process (see FIG. 5(a)) for removing the inner tube portion 21c of the trap body 21, a polishing process (see FIG. 5(b)) for removing rust, bumps, etc. adhering to the inner circumferential surface of the trap body 21 and the inner circumferential surface of the direct connecting pipe 12, an inner fitting process (see FIGS. 6(c) and (d)) for inserting the inner pipe 34 into the direct connecting pipe 12, leaving the upper part unattached, a coating process (see FIG. 7(e)) for applying a coating agent 41 to the inner circumferential surface of the trap body 21, an outer fitting process (see FIGS. 7(f) and 8(g)) for fitting the outer pipe 36 to the inner pipe 34 and fixing it to the bottom plate portion 21a, and a socket fitting process (see FIG. 8(h)) for bonding annular sockets 38 to the upper ends of the outer pipe 36 and the inner pipe 34.

[0047] The inner fitting process includes an inserting process (see FIG. 6(c)) of inserting the inner pipe 34 into the direct-downward connecting pipe 12 using a pipe setting jig 43, and a filling process (see FIG. 6(d)) of filling a waterproofing agent 45 (filler) into the gap between the inner pipe 34 and the direct-downward connecting pipe 12 (connection short pipe 31). Similarly, the outer fitting process includes a first fixing process (see FIG. 7(f)) of using a first adhesive 47, which is a high-viscosity epoxy resin adhesive, to bond the outer pipe 36 to the outer peripheral surface of the inner pipe 34 with the flange portion 36b seated on the bottom plate portion 21a, and a second fixing process (see FIG. 8(g)) of pouring a second adhesive 49, which is a low-viscosity epoxy resin adhesive, onto the bottom plate portion 21a so that the flange portion 36b is submerged, and allowing it to harden.

[0048] In the inner tube removal process shown in Figure 5(a), the inner tube portion 21c, whose shape varies depending on the manufacturer, is removed. At the boundary between the inner tube portion 21c and the connecting thread portion 21d, there is a space called a "recess" whose dimensions are specified by a standard. The inner tube portion 21c is ground from above to reach this recess. Grinding can be performed using, for example, a hole saw 51, either to remove the inner tube portion 21c from above or to remove the outer half of the inner tube portion 21c from above. The remaining portion is then broken off with a steel rod or a diamond drill bit, resulting in a smooth finish. Alternatively, multiple vertical cuts can be made in the inner tube portion 21c using a saber saw or similar tool, and each cut piece can be broken off.

[0049] In the polishing process shown in Figure 5(b), a chain-attached polishing bit 53 (electric drill) is used to polish from the inner surface of the connecting short pipe 31 to the inner surface of the trap main body 21 to remove rust, bumps, etc. In parallel with the polishing, dust is removed by suction or the like to clean the inner surface of the trap main body 21 and the inner surface of the connecting short pipe 31. As a result, the bare surface of the entire inner surface of the connecting short pipe 31 is exposed. Furthermore, the inner diameter of the connecting short pipe 31, whose inner surface has been polished, is expanded to approximately 54 mm. At the final stage of the polishing process, it is confirmed that the above-mentioned drain hole 27 is exposed on the inner surface of the trap main body 21.

[0050] In the insertion process (inner fitting process) shown in Figure 6(c), the dimensions of the inner pipe 34 are first determined, and the inner pipe 34 of the desired length is cut out of the PVC raw pipe based on these dimensions. The dimensions of the inner pipe 34 are determined so that its lower end reaches the joint between the connecting short pipe 31 and the L-shaped joint 32 and its upper end is positioned approximately 60 mm above the top surface of the bottom plate portion 21a. This measurement is taken by extending the convex and hooking it onto the end of the 90° elbow and reading the markings approximately 60 mm above the top surface of the bottom plate portion 21a. Alternatively, the outer pipe 36 may be temporarily placed in place, and then the convex may be extended and the markings read at a position slightly higher than the outer pipe 36.

[0051] Next, the inner pipe 34 cut from the PVC raw pipe is deburred, and then the inner pipe 34 is attached to a pipe setting jig 43. The pipe setting jig 43 has a handle (not shown) at the hand, and a sponge-like rubber stopper 43c attached to the tip of the operating rod 43a by clamping it between two clamping pieces 43b. In this case, by rotating the handle, the rubber stopper 43c can be deformed between its original cylindrical shape and a hand-drum shape that contracts axially and expands radially.

[0052] The inner pipe 34 is attached to the pipe setting jig 43 so that its lower end is positioned at the rubber stopper 43c, leaving the leading edge half of the entire rubber stopper 43c exposed, and the rubber stopper 43c is slightly inflated. In this state, the inner pipe 34 is slowly inserted into the direct-connecting pipe 12 together with the pipe setting jig 43. When the upper end of the inner pipe 34 is roughly positioned within the trap body 21, insertion is stopped. After making any necessary fine adjustments, the rubber stopper 43c is inflated by manipulating the grip, fixing the inner pipe 34 and sealing the gap between the lower end of the inner pipe 34 and the direct-connecting pipe 12. During this final sealing process, it is preferable to position the inner pipe 34 vertically via the operating rod 43a.

[0053] 6(d), a water-stopping agent 45 (liquid) is poured between the upper part of the inner pipe 34 protruding into the trap body 21 and the outer cylinder part 21b, and the water-stopping agent 45 is allowed to flow from this part into the gap between the inner pipe 34 and the direct-connecting pipe 12. This water-stopping agent 45 is polyurethane-based, and gels in a short time when mixed with water. Therefore, the water-stopping agent 45 that flows into the gap between the inner pipe 34 and the direct-connecting pipe 12 expands and gels, filling the gap.

[0054] The waterproofing agent 45 hardens (gels) with its lower end in contact with the rubber stopper 43c that seals the gap between the lower end of the inner pipe 34 and the direct-connecting pipe 12, and its upper portion hardens (gels) with a small amount of the agent pooled on the bottom plate portion 21a. Because the adhesive strength of this waterproofing agent 45 is extremely weak, any excess waterproofing agent 45 pooled on the bottom plate portion 21a is removed by peeling it off. Also, around the same time as this removal, the grip portion is operated to loosen the rubber stopper 43c, and the pipe setting jig 43 is pulled out from the inner pipe 34.

[0055] In the coating process shown in Figure 7(e), the drainage holes 27 and the inner pipe 34 are first masked. The drainage holes 27 are masked by inserting pins, and the upper end of the inner pipe 34 is masked with masking tape. The coating agent 41 used is a high-viscosity, two-component epoxy resin adhesive. In the following explanation, this epoxy resin adhesive will sometimes be referred to as the "coating agent 41" or the "first adhesive 47," depending on the location where it is applied.

[0056] The coating agent 41 is applied by brushing to the entire inner surface of the trap body 21, the inner circumferential surface of the strainer support portion 23, and the outer circumferential surface of the inner pipe 34 that protrudes into the trap body 21. This prevents further corrosion of the trap body 21 and the strainer support portion 23. The coating agent 41 applied to the inner pipe 34 functions as a first adhesive 47 that bonds the outer pipe 36 to the inner pipe 34, and the coating agent 41 applied to the other parts except for the inner cylindrical portion 21c also serves as an insulating agent that insulates the trap body 21 from the outer pipe 36.

[0057] In the first fixing step (outer mounting step) of FIG. 7(f), the outer pipe 36 is bonded to the inner pipe 34 immediately after the coating agent 41 (first adhesive 47) is applied (before it hardens). In this case, epoxy putty 55 (putty) is first applied to the portion of the outer pipe 36 where the flange portion 36b will sit, and the first adhesive 47 is then applied to the inner circumferential surface of the outer pipe 36 (main pipe portion 36a). The portion where the flange portion 36b will sit is the portion where the inner cylindrical portion 21c has been removed, and may have slight irregularities. Therefore, the epoxy putty 55 is placed in this portion to absorb these irregularities (and also serves as insulation).

[0058] In actual work, epoxy putty 55 is applied to the portion where flange portion 36b will sit, and then outer pipe 36, with first adhesive 47 applied to its inner peripheral surface, is fitted into inner pipe 34, and flange portion 36b is pressed against epoxy putty 55. In other words, first adhesive 47 is allowed to spread between inner pipe 34 and outer pipe 36, and at the same time, epoxy putty 55 is compressed to allow flange portion 36b to spread therewith.

[0059] At this time, if the gap between the inner pipe 34 and the outer pipe 36 is not sufficiently filled with the first adhesive 47 (if there is a gap), the first adhesive 47 impregnated with a brush is poured into the gap to promote filling of the first adhesive 47. Next, the position of the outer pipe 36 is adjusted to be vertical, but before that, the first adhesive 47 adhering to the outer peripheral surface of the upper end of the inner pipe 34 that protrudes from the upper end of the outer pipe 36 is wiped off with a solvent.

[0060] Although not shown in the drawings, when adjusting the posture of the outer pipe 36, first, the annular socket 38 is temporarily placed on the upper end of the outer pipe 36 (and inner pipe 34). Next, a spirit level is set on top of the annular socket 38. Then, while watching the spirit level, the angle of the outer pipe 36 is slightly adjusted so that the annular socket 38 is horizontal. Once the annular socket 38 is level, the posture of the outer pipe 36 has been indirectly adjusted, so the annular socket 38 is temporarily removed along with the spirit level, and the process moves to the second fixing step.

[0061] In the second fixing step (outer attachment step) of FIG. 8(g), a low-viscosity, two-component epoxy resin adhesive, second adhesive 49, is prepared and poured onto the bottom plate 21a so that the flange 36b of the outer pipe 36 is submerged. This low-viscosity resin adhesive (second adhesive 49) presses down on the flange 36b to fix the outer pipe 36 to the trap body 21, and is poured to a liquid level of approximately 10 mm. In this case, the second adhesive 49 is poured before the first adhesive 47 hardens, so that the first adhesive 47 and the second adhesive 49 fuse together at their interface. Next, the coating agent 41, first adhesive 47, second adhesive 49, and epoxy putty 55 are hardened using a dryer or the like.

[0062] 8(h), a third adhesive 57 (vinyl chloride adhesive) for vinyl chloride is applied to the upper end of the inner pipe 34 from which the first adhesive 47 has been wiped off, and the annular socket 38 is fitted into this portion to be attached. The third adhesive 57 is then allowed to harden and then cured. As a result, the inner pipe 34, outer pipe 36, and annular socket 38 are integrated to form the composite pipe section 15.

[0063] [Post-process] As mentioned above, this method of renovating the bathroom drain 10 can then be used to rehabilitate the bowl trap 11, and the bowl trap 11 can also be used as a drain connection pipe when the bathroom is unitized. 9(a) shows the state in which the bowl trap 11 has been rehabilitated. As shown in the figure, in the rehabilitation of this bowl trap 11, the transition is completed by setting the bowl 22 and the strainer 24 on the refurbished bowl trap 11. In this case, the bowl 22 is set so that it rests on the annular socket 38 (synthetic pipe section 15).

[0064] 9(b) shows a state in which a unit drain pipe 63 can be connected using the bowl trap 11. As shown in the figure, the portion from the annular socket 38 to the outer pipe 36 forms a joint, and the unit drain pipe 63 is connected to the composite pipe section 15 via a short union 61 (union joint). This short union 61 is formed compactly and can be housed within the trap body 21, and can be tightened within the trap body 21.

[0065] The unit drain pipe 63 has an above-slab pipe 65 that runs horizontally from the bathroom unit (not shown), a 90° elbow 66 connected to the above-slab pipe 65, and an adjustment short pipe 67 connected to the 90° elbow 66. The adjustment short pipe 67 is then connected to the synthetic pipe section 15 with a short union 61. In this case, the unit drain pipe 63 is made of a fire-resistant double pipe with a nominal diameter of 50A, in which the outer surface of a hard polyvinyl chloride pipe is coated with a fire-resistant material (asbestos cement), taking fire resistance into consideration. This achieves fireproofing within 1 meter of the penetration into the fire compartment (slab S), and the fire compartment provided by the slab S is maintained.

[0066] Furthermore, since unit drain pipe 63 is installed from the bathroom unit taking into account the drainage gradient, the height position of 90° elbow 66 is automatically determined by the height and planar position (distance) of the bathroom unit's drain outlet. Therefore, the distance between 90° elbow 66 and short union 61 or composite pipe 15 is adjusted by adjustment short pipe 67, which is cut on-site to fit.

[0067] As is clear from Figures 9(a) and (b), the bowl trap 11 after rehabilitation can be prepared to function as a drainage connection pipe simply by removing the bowl 22 and strainer 24 from the bowl trap 11.

[0068] As described above, according to the first embodiment of the method for repairing the bathroom drain outlet 10, the inner pipe 34 is inserted into the direct connecting pipe 12 and the gap between the direct connecting pipe 12 and the inner pipe 34 is filled with a waterproofing agent 45, thereby simultaneously repairing the direct connecting pipe 12 and forming a new outflow flow path 29. Furthermore, because the inner pipe 34 is formed to have approximately the same diameter as the unit drain pipe 63, drainage capacity is not impaired after repair. Furthermore, by fitting the outer pipe 36 corresponding to the inner tube portion 21c onto the outer circumferential surface of the inner pipe 34 and fastening it to the bottom plate portion 21a, the unit drain pipe 63 can be connected to this portion via a short union 61. In this way, the renovation work to enable connection of unit drain pipe 63 and the renovation work to restore the function of bowl trap 11 can be performed as commonly as possible. Therefore, by placing bowl 22 on synthetic pipe section 15 and setting strainer 24 on trap body 21, the function of bowl trap 11 can be restored, while by connecting unit drain pipe 63 to synthetic pipe section 15 via short union 61, drainage treatment of the bathroom unit becomes possible.

[0069] When carrying out renovation work on the floor below the above renovation work, the same renovation work as above is carried out, and the directly below connecting pipe 12 exposed on the ceiling is cut near the underside of the slab S, and the L-shaped joint 32 leading to the drainage standpipe and the horizontal drain pipe 13 are replaced with new ones. In this case, the connecting short pipe 31 is cut, and at the same time, the lower end of the inner pipe 34 is also cut. Therefore, although not specifically shown, a newly developed elbow is used to connect the new horizontal drain pipe 13 to the cut ends of the connecting short pipe 31 and inner pipe 34.

[0070] [Second embodiment] Next, we will explain the method for repairing the bathroom drain 10 according to the second embodiment. This embodiment uses a rehabilitation pipe material 70 that corresponds to the composite pipe section 15 described above, and is designed to shorten the construction period compared to the repair method of the first embodiment.

[0071] Figure 10 shows the bathroom drain outlet 10 after renovation, and Figure 11 shows the rehabilitation pipe material 70 that is the main part of the renovation. As shown in both figures, the rehabilitation pipe material 70 includes an insertion pipe section 71 that is inserted into the direct connecting pipe 12, a joining pipe section 72 that also serves as the inner tube section 21c and is configured to be joinable to the unit drain pipe 63 via a short union 61, and a flange section 73 that is provided at the boundary between the insertion pipe section 71 and the joining pipe section 72 and is seated on the bottom plate section 21a.

[0072] The rehabilitation pipe material 70 may be made of a resin such as polyvinyl chloride or a metal such as stainless steel, but is preferably an integral piece. However, it may also be made by previously bonding (adhering) multiple parts together to form an integrated piece, like the composite pipe section 15 described above.

[0073] The insertion pipe section 71 of the rehabilitation pipe material 70 corresponds to the lower half of the inner pipe 34 in the composite pipe section 15, and the joining pipe section 72 corresponds to the combination of the main pipe section 36a of the outer pipe 36 in the composite pipe section 15, the upper half of the inner pipe 34, and the annular socket 38. The flange section 73 of the rehabilitation pipe material 70 corresponds to the flange section 36b of the outer pipe 36 in the composite pipe section 15. A chamfered section 72a similar to the annular chamfered section 38b of the annular socket 38 is formed at the inner tip of the joining pipe section 72.

[0074] In this case, the inner peripheral surface of the inserted pipe portion 71 and the inner peripheral surface of the joining pipe portion 72 are formed to have the same diameter and are connected together to form the outflow passage 29. The inner diameter of the rehabilitation pipe material 70 formed by the inserted pipe portion 71 and the joining pipe portion 72 is formed to be the same diameter (48 mm) as the inner diameter of the inner pipe 34. In addition, the outer peripheral surface of the joining pipe portion 72 forms the joining margin of the short union 61. In other words, the outer diameter of the joining pipe portion 72 is formed to be the same diameter (60.5 mm) as the outer diameter of the outer pipe 36.

[0075] The length of the rehabilitation pipe material 70 is, like the composite pipe section 15, such that when the flange section 73 is seated on the bottom plate section 21a, the lower end reaches the joint end of the L-shaped joint 32 in the direct-down connecting pipe 12, and the upper end is somewhat higher than the original inner cylindrical section 21c. In this case, the rehabilitation pipe material 70 is manufactured longer above the flange section 73 and below the flange section 73, and then cut to fit on site.

[0076] [Renovation method] Here, a method for repairing the bathroom drain 10 of the second embodiment using the rehabilitation pipe material 70 will be described. This repair method includes an inner tube removal process (see Figure 5(a)) for removing the inner tube portion 21c of the trap main body 21, a polishing process (see Figure 5(b)) for removing rust, bumps, etc. adhering to the inner surface of the trap main body 21 and the inner surface of the direct-down connecting pipe 12, a coating process (see Figure 7(e)) for applying a coating agent 41 to the inner surface of the trap main body 21, a setting process (see Figure 12(a)) for inserting the insertion pipe portion 71 into the direct-down connecting pipe 12 and setting the rehabilitation pipe material 70 so that the flange portion 73 is seated on the bottom plate portion 21a, a filling process (see Figure 12(b)) for filling the gap between the inserted insertion pipe portion 71 and the direct-down connecting pipe 12 with a water-stopping agent 45, and a fixing process (see Figure 8(g)) for fixing the flange portion 73 to the bottom plate portion 21a.

[0077] The inner cylinder removal process and polishing process are exactly the same as those in the first embodiment, and therefore will not be described here. In the coating process, after masking to prevent the first adhesive 47 from entering the direct connecting pipe 12, a coating agent 41 is applied to the inner circumferential surface of the trap main body 21. After the coating agent 41 has hardened, the process moves to the next setting process.

[0078] In the setting process shown in FIG. 12(a), the upper and lower ends of the rehabilitation pipe material 70 are cut to fit the site, as with the inner pipe 34 of the first embodiment. Next, the rehabilitation pipe material 70 is attached to the pipe setting jig 43 in the same manner as in the first embodiment. After the rehabilitation pipe material 70 is attached to the pipe setting jig 43, the rehabilitation pipe material 70 is slowly inserted into the direct-connecting pipe 12 together with the pipe setting jig 43. Here, the insertion is stopped just before the flange portion 73 seats on the bottom plate portion 21a, and the grip portion is operated to fix the rehabilitation pipe material 70 and seal the gap between the lower end of the rehabilitation pipe material 70 and the direct-connecting pipe 12. In this way, the rehabilitation pipe material 70 is temporarily set by the pipe setting jig 43.

[0079] 12(b), the waterproofing agent 45 is poured between the joint pipe portion 72 and the outer tube portion 21b of the rehabilitation pipe material 70 in the temporarily set state, and the waterproofing agent 45 is allowed to flow from this portion into the gap between the inserted pipe portion 71 of the rehabilitation pipe material 70 and the direct-down connecting pipe 12. Once the gap between the inserted pipe portion 71 and the direct-down connecting pipe 12 has been filled with the waterproofing agent 45, the grip of the pipe setting jig 43 is loosened and the rehabilitation pipe material 70 is pushed in so that the flange portion 73 seats on the bottom plate portion 21a. This transitions the rehabilitation pipe material 70 from the temporarily set state to a set state in which the flange portion 73 seats on the bottom plate portion 21a, and the waterproofing agent 45 is then allowed to harden. Once the waterproofing agent 45 has hardened, the excess waterproofing agent 45 accumulated on the bottom plate portion 21a is removed, and the pipe setting jig 43 is pulled out from the pipe material 70 to be rehabilitated.

[0080] Then, in the fixing process, as in the first embodiment, the second adhesive 49 is poured onto the bottom plate portion 21a so that the flange portion 73 of the rehabilitation pipe material 70 is submerged, and the work is completed after waiting for the second adhesive 49 to harden.

[0081] As described above, according to the second embodiment of the bathroom drain outlet 10 repair method, the insertion pipe portion 71 of the rehabilitation pipe material 70 is inserted into the direct-connecting pipe 12, and the gap between the direct-connecting pipe 12 and the insertion pipe portion 71 is filled with a waterproofing agent 45, thereby simultaneously repairing the direct-connecting pipe 12 and forming a new outflow flow path 29. Furthermore, because the insertion pipe portion 71 is formed to have approximately the same diameter as the unit drain pipe 63, drainage capacity is not impaired after repair. Furthermore, by fastening the joint pipe portion 72 of the rehabilitation pipe material 70 corresponding to the inner tube portion 21c to the bottom plate portion 21a (trap body 21) via the flange portion 73, the unit drain pipe 63 can be connected to this portion via the short union 61. In this way, the renovation work to enable connection of unit drain pipe 63 and the renovation work to restore the function of bowl trap 11 can be performed as commonly as possible. Therefore, by placing bowl 22 on rehabilitation pipe material 70 and setting strainer 24 on trap body 21, the function of bowl trap 11 can be restored, while by connecting unit drain pipe 63 to rehabilitation pipe material 70 via short union 61, drainage treatment of the bathroom unit becomes possible. [Explanation of symbols]

[0082] 10...Bathroom drain outlet, 11...Bowl trap, 12...Direct connecting pipe, 15...Synthetic pipe section, 21...Trap body, 21a...Bottom plate section, 21b...Outer tube section, 21c...Inner tube section, 21d...Connecting screw section, 22...Bowl, 31...Connecting short pipe, 32...L-shaped joint, 34...Inner pipe, 36...Outer pipe, 36a...Main pipe section, 36b...Flange section, 38...Annular socket, 41...Coating agent, 43...Pipe setting jig, 45...Waterstop agent, 47...First adhesive, 49...Second adhesive, 55...Epoxy putty, 57...Third adhesive, 61...Short union, 63...Unit drain pipe, 70...Rehabilitation pipe material, 71...Inserted pipe section, 72...Connecting pipe section, 73...Flange section, S...Slab,

Claims

1. A bathroom drain repair method that allows the function of the outflow flow path around the trap body of the bathroom drain trap to be restored and allows the connection of a unit drain pipe to the outflow flow path when the bathroom is unitized. an inner cylinder removal step of removing the inner cylinder of the trap body, which has a bottom plate, an outer cylinder extending upward from the outer peripheral end of the bottom plate, an inner cylinder extending upward from the inner peripheral end of the bottom plate, and a connecting screw portion extending downward from the inner peripheral end of the bottom plate; an inner fitting process in which an inner pipe serving as the outflow passage is inserted into a connecting short pipe connected to the connecting thread portion and a direct connecting pipe having a drain joint connected to the connecting short pipe, leaving an upper part, and is inserted in a watertight state; an outer fitting step of fitting an outer pipe corresponding to the inner cylindrical portion onto an upper outer peripheral surface of the inner pipe and fixing the outer pipe to the bottom plate portion, The outer pipe is configured to be connectable to a union joint for connecting the unit drain pipe, A method for renovating a bathroom drain, characterized in that the inner pipe is formed to have approximately the same diameter as the unit drain pipe.

2. In the inner fitting step, The method for renovating a bathroom drain outlet as described in claim 1, characterized in that the inserted state is maintained in a watertight state by filling the gap between the inserted inner pipe and the direct connecting pipe with a filler.

3. In the inner fitting step, a pipe setting jig that holds the inner pipe from the inside, enables insertion into the direct-down connecting pipe, and seals the tip of the inner pipe between the direct-down connecting pipe, The inner pipe is inserted into the direct connecting pipe so that the tip thereof reaches the drain joint, and the tip of the inner pipe is sealed between the drain joint and the direct connecting pipe. In this state, the filler is filled in, The method for repairing a bathroom drain according to claim 2, characterized in that the pipe setting jig is pulled out from the inner pipe after the filled filler has hardened.

4. In the inner fitting step, A method for renovating a bathroom drain as described in claim 2 or 3, characterized in that the filler that has been temporarily stored on the bottom plate portion of the trap body is poured into the gap between the inner pipe and the direct connecting pipe to fill it, and after the filler has hardened, the remaining filler on the bottom plate portion is removed by peeling it off.

5. Between the inner mounting step and the outer mounting step, 5. The bathroom drain renovation method according to claim 1, further comprising a coating step of applying a coating agent to the inner circumferential surface of the trap body.

6. the outer pipe has a flange portion at one end, In the outer fitting step, a first fixing step of bonding the outer pipe to an outer peripheral surface of the inner pipe using a high-viscosity adhesive with the flange portion seated on the bottom plate portion; A method for renovating a bathroom drain as described in any one of claims 1 to 5, characterized in that it includes a second fixing process in which a low-viscosity adhesive is poured onto the bottom plate portion so that the flange portion is submerged, and then allowed to harden.

7. In the first fixing step, Before the flange portion is seated on the bottom plate portion, putty is applied to the seating portion; The bathroom drain repair method according to claim 6, further comprising the step of pressing down the putty while seating the flange portion so that the outer pipe is in a vertical position.

8. The inner pipe protrudes slightly upward relative to the outer pipe, and an annular socket is provided for attachment to this protruding portion. After the outer layer attaching step, A method for renovating a bathroom drain as described in any one of claims 1 to 7, characterized in that it further comprises a socket attachment process in which the inner surface of the annular socket is adhered to the outer surface of the protruding portion of the inner pipe while the lower end of the annular socket is abutted against the upper end of the outer pipe.

9. A bathroom drain outlet has an outflow passage formed by an inner cylindrical portion extending upward from the inner peripheral end of the bottom plate portion of the trap body, and a direct connecting pipe connected to the trap body and continuing to the inner cylindrical portion. This is a rehabilitation pipe material that is installed in place of the inner cylindrical portion to rehabilitate the outflow passage, an insertion pipe portion to be inserted into the direct-below connecting pipe; A joint pipe portion that also serves as the inner tube portion and is configured to be connectable to a unit drain pipe associated with unitizing a bathroom via a union joint; a flange portion provided at a boundary portion between the insertion pipe portion and the joining pipe portion and seated on the bottom plate portion, the outflow passage is formed by an inner circumferential surface of the insertion pipe section and an inner circumferential surface of the joining pipe section, A rehabilitation pipe material is used in which the outer peripheral surface of the joint pipe portion forms a joint margin of the union joint, A bathroom drain repair method that allows the function of the outflow flow path around the trap body to be restored and allows the connection of a unit drain pipe to the outflow flow path when the bathroom is unitized, an inner cylinder removing step of removing the inner cylinder portion; a setting step of inserting the insertion pipe portion into the direct-connecting pipe and setting the rehabilitation pipe material so that the flange portion is seated on the bottom plate portion; a filling step of filling a gap between the inserted insertion pipe portion and the direct-down connection pipe with a filler; A method for renovating a bathroom drain, comprising a fixing step of fixing the flange portion to the bottom plate portion.

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