Lining system and method for renovating drain outlets using the same

Abstract

To provide a lining system, etc., that is simple in a structure and does not cause wrinkles or floating in a lining material.SOLUTION: A lining system 30 that makes a lining material 25 adhere to a flow path of a drain port 1 composed of a bowl trap 2 and a direct connection pipe 3 includes: a first lining jig 30A composed of a first jig body 31 and a first inflatable membrane body 32 covering an outer periphery of the first jig body 31; and a second lining jig 30B composed of a second jig body 61 and a second inflatable membrane body 62 covering the outer periphery of the second jig body 61. The first lining jig 30A makes the lining material 25 adhere to an inner surface of a straight pipe flow path 22 composed of an outlet flow path 22a and a pipe internal flow path 22b, and the second lining jig 30B makes the lining material 25 adhere to an inlet flow path 21.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a lining system for attaching a lining material in which a resin is impregnated into a fiber reinforcing material to the inner surface of the flow path of an existing drain outlet composed of a bowl trap and a directly connected pipe connected thereto, and a method for repairing a drain outlet using the same.

Background Art

[0002] Conventionally, as a method for repairing this type of drain outlet, a liner layer is formed on the entire outer periphery, bottom, and inner wall of the drain outlet of a drain trap (bowl trap) by a "presser", and a liner layer is formed on the straight pipe, elbow pipe, and horizontal pipe at the lower part of the drain outlet by a "reverser" (see Patent Document 1). In the formation of the liner layer by the reverser, a lining cloth tube is formed by inserting a tubular lining cloth impregnated with a lining agent inside a lining tube, a constriction part is formed at the upper part of the lining cloth tube, a wire is connected, the wire is inserted through the insertion hole of a plug member that closes the upper part of the reverser, and the wire is pulled up to insert the lining cloth tube inside the reverser, and the lower end part of the lining tube is folded back and fastened to the outer periphery of the lower end part of the reverser. From this state, compressed air is supplied, and while the lining cloth tube is being reversed, it is fed into the straight pipe, elbow pipe, and horizontal pipe. After the lining cloth tube has been fed in, wait for the lining agent to cure, and then pull the wire so as to peel the lining tube from the cured lining cloth. Furthermore, in forming the liner layer using a press, an outer tube is provided with a gap around the outer circumference of the lower part of the main tube, and a press is formed with cylindrical silicone rubber on the inner circumference of both the main tube and the outer tube. The upper part of the silicone rubber of the press is sealed and fastened to the upper end of the main tube, while the lower part of the silicone rubber is folded back and fastened to the outer circumference of the lower end of the outer tube, thereby sealing the upper and lower parts of the silicone rubber and allowing compressed air to be injected into the gap between the main tube and the outer tube. A cylindrical lining cloth impregnated with lining agent is placed over the outer circumference of the silicone rubber of the press, and the excess length of the lower part of the silicone rubber is folded back into the inner part of the outer tube of the press. With the press fitted around the outer circumference of the drain opening of the drain trap, compressed air is injected into the silicone rubber to expand it, causing the lining cloth to adhere to the inner wall of the drain trap. The press is then removed after waiting for the lining agent to harden. Due to the structure of the equipment, the formation of the liner layer by the inverter and the formation of the liner layer by the presser cannot be carried out simultaneously. Therefore, the liner layer is formed by the inverter first, and then the liner layer is formed again by the inverter. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 5534096 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] In this method of forming a liner layer on the straight, curved, and horizontal pipes below the drain outlet using a reversing device, there was a problem that the device configuration became large and complex despite the relatively short length of the liner layer to be formed. In addition, in the curved pipe sections, there were problems such as wrinkles due to uneven expansion and contraction of the lining cloth and lifting due to trapped air. Similarly, when forming a liner layer on the outer circumference, bottom, and entire inner wall of a drain opening using a press, the expanding silicone rubber first comes into contact with the outer circumference of the drain opening and the upper part of the inner wall of the trap. This causes a force to compress the lining cloth towards the bottom, and also makes it easier for air to be trapped at the bottom. As a result, there was a problem of wrinkles and lifting in the lining cloth.

[0005] The present invention aims to provide a lining system with a simple structure that prevents wrinkles and lifting of the lining material, and a method for repairing drainage outlets using the same. [Means for solving the problem]

[0006] The present invention provides a lining system for attaching a lining material, which is a fiber-reinforced material impregnated with resin, to the inner surface of the flow path of a drain outlet consisting of a bowl trap and a direct connecting pipe connected to the bowl trap, and comprises a first lining jig for attaching the lining material to the inner surface of the flow path of the straight pipe section, which consists of the outflow flow path and the internal flow path of the direct connecting pipe connected to the outflow flow path, among the inflow flow path of the trap body including the water seal part of the bowl trap, the outflow flow path of the trap body connected to the inflow flow path, and the internal flow path of the direct connecting pipe connected to the outflow flow path, wherein the first lining jig The invention comprises a cylindrical first jig body having an air supply port at its upper end and an air chamber connected to the supply port inside, and a first expansion membrane covering the outer periphery of the first jig body with a gap space communicating with the air chamber, and expanding to a shape substantially complementary to the inner surface of the straight pipe passage by air supplied from the supply port through the air chamber, wherein the first expansion membrane has two annular sealing portions at both the upper and lower ends that maintain airtightness with the first jig body, and an expansion portion between the two annular sealing portions that has a length corresponding to the straight pipe passage.

[0007] In this configuration, when air is supplied from the supply port, the air flows through the air chamber into the gap between the first jig body and the first expansion membrane, inflating the expansion portion of the first expansion membrane. The expansion portion expands to a shape approximately complementary to the inner surface of the straight pipe flow path, pressing the lining material against the inner surface of the straight pipe flow path. In this case, since the expansion portion expands to a shape approximately complementary to the inner surface of the straight pipe flow path, the pressing force of the expansion portion against the inner surface of the straight pipe flow path acts uniformly and simultaneously throughout the entire area. Therefore, the occurrence of wrinkles and lifting in the lining material of the straight pipe flow path can be prevented as much as possible.

[0008] In this case, it is preferable that the radial expansion width of the first expanding membrane for attaching the lining material is approximately 10 mm.

[0009] With this configuration, when inserting the lining jig into the flow path of a straight pipe section lined by hand, the first expansion membrane does not get caught on the edge of the lining material, and the expansion width of the first expansion membrane can be kept as narrow as possible. As a result, the lining material can be pressed stably and uniformly without compromising workability.

[0010] Furthermore, it is preferable that the first expanded membrane has a pair of folded portions that are folded and overlapped at each annular sealing portion.

[0011] With this configuration, the pair of folded sections overlap with both outer ends of the expansion section, thus suppressing expansion at these outer ends. As a result, the expanding section contacts and presses against the inner surface of the flow path in the straight pipe section from its middle section in the direction of extension. This causes the air trapped in the lining material to be pushed out (sent out) towards both outer ends of the expansion section, effectively preventing the lining material from floating.

[0012] Furthermore, the system includes a second lining jig for attaching lining material to the inner surface of the inflow channel, which consists of the inner surface of the outer cylinder, the upper surface of the bottom plate, and the outer surface of the inner cylinder. The second lining jig has a substantially cylindrical second jig body with an air supply port and an air chamber connected thereto at its upper part, and a skirt portion at its lower part that is inserted into the inflow channel so as to abut against the upper surface of the bottom plate. The outer circumference of the second jig body is covered with a gap space that communicates with the air chamber, and the air supplied from the supply port via the air chamber is attached to the second lining jig. Preferably, the device comprises a second expanding membrane that expands due to air, the inner circumferential surface of the skirt portion being formed in a shape substantially complementary to the outer surface of the inner cylinder portion, the second expanding membrane having two annular sealing portions at both the upper and lower ends that maintain airtightness with the second jig body, an expanding portion that covers the outer circumferential surface of the skirt portion and expands to a shape substantially complementary to the inner surface of the outer cylinder portion due to air, and an expansion suppression portion that covers the outer circumferential surface of the second jig body excluding the skirt portion and guides the air from the air chamber to the expanding portion while expansion is suppressed.

[0013] In this configuration, when the second jig body is inserted into the inflow channel so as to abut against the upper surface of the bottom plate of the trap body, the inner circumferential surface of the skirt portion, which is formed in a shape substantially complementary to the outer surface of the inner cylinder of the trap body, presses (compresses) the lining material against the outer surface of the inner cylinder, and the lower end surface of the skirt portion also presses (compresses) the lining material against the upper surface of the bottom plate. Next, when air is supplied from the supply port, the air flows through the air chamber into the gap space between the second jig body and the second expansion membrane, and inflates the expansion portion of the second expansion membrane via the expansion suppression portion. The expansion portion expands to a shape substantially complementary to the inner surface of the outer cylinder of the trap body, pressing the lining material against the inner surface of the outer cylinder. In this case, the inner circumferential surface of the skirt portion is formed in a shape that is substantially complementary to the outer surface of the inner cylinder portion, and the expanded portion expands in a shape that is substantially complementary to the inner surface of the outer cylinder portion. Therefore, the pressing force that presses the lining material against the inner surface of the inflow channel acts substantially uniformly throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material of the inflow channel can be prevented as much as possible.

[0014] In this case, the expansion suppression portion is preferably composed of a folded extension portion of the second expansion membrane body, which is folded back and overlapped at the annular sealing portion at the upper end.

[0015] With this configuration, when air is supplied to the gap, the expansion suppression section suppresses expansion and guides the air to the expansion section, causing the expansion section to expand. In other words, the second expansion membrane can be expanded mainly with respect to the expansion section, which is the part necessary for lining the inner surface of the outer cylinder. Therefore, lining (pressing of the lining material) can be performed efficiently.

[0016] Furthermore, it is preferable that the second jig body further includes a jig housing section for accommodating the upper exposed portion of the first lining jig facing the straight pipe section when its lower part is inserted into the inflow section flow path.

[0017] With this configuration, the lining work on the straight pipe section using the first lining jig and the lining work on the inlet section using the second lining jig can be carried out almost simultaneously, thereby shortening the lining work time.

[0018] The present invention relates to a drain repair method, which uses the lining system described in claim 4 to repair an existing drain consisting of a bowl trap and a connecting pipe directly below the bowl trap, comprising: an attachment step of attaching lining material to the inner surface of the flow channel of the inflow channel and the inner surface of the flow channel of the straight pipe channel; an attachment step of attaching a release film for peeling to the surface of the lining material; a first insertion step of inserting and setting a first lining jig into the straight pipe channel; and supplying air to the first lining jig and pressing the lining material with a first expansion film in the flow channel of the straight pipe channel. The invention is characterized by comprising: a first pressing step of adhering the material to the inner surface of the road; a detachment step of closing the supply port and removing the air tube connected thereto from the supply port; a second insertion step of inserting and setting a second lining jig into the inflow channel; a second pressing step of supplying air to the second lining jig and adhering the lining material to the inner surface of the inflow channel of the inflow pipe by pressing the lining material with a second expansion membrane; a curing and hardening step of hardening the resin in the lining material; and a removal step of removing the first lining jig, the second lining jig, and the release membrane after the air has been released.

[0019] With this configuration, in the first pressing step, when air is supplied, the expansion section expands to a shape approximately complementary to the inner surface of the straight pipe section's flow path. Therefore, the pressing force of the expansion section that presses the lining material against the inner surface of the straight pipe section's flow path acts uniformly and simultaneously throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material can be prevented as much as possible. Furthermore, the second insertion process results in the inner circumferential surface of the skirt portion being formed in a shape substantially complementary to the outer surface of the inner cylinder portion, pressing the lining material against the outer surface of the inner cylinder portion, and the lower end surface of the skirt portion pressing the lining material against the upper surface of the bottom plate portion. Furthermore, in the second pressing process, when air is supplied, the expansion section expands to a shape approximately complementary to the inner surface of the outer cylinder. As a result, the pressing force that presses the lining material against the inner surface of the inflow channel acts approximately uniformly throughout the entire area. Therefore, the occurrence of wrinkles and lifting in the lining material of the inflow channel can be prevented as much as possible.

[0020] In this case, it is preferable that in the first insertion step, the first lining jig is inserted and set with the upper end of the expansion portion protruding from the upper end of the straight pipe section flow path, and between the first insertion step and the first pressing step, a pipe setting step is further provided in which a short pipe, which surrounds the upper end of the protruding expansion portion and is formed to be the same diameter as the straight pipe section flow path, is set coaxially with the straight pipe section flow path.

[0021] With this configuration, the lining jig is inserted and set so that the end of the expansion section protrudes from the upper end of the straight pipe flow path, and the short pipe is set so as to surround this section. As a result, the lining material at the upper end of the straight pipe flow path can be finished to a good condition. In addition, the expansion shape of the expansion membrane can be made straight, including the end, which effectively prevents bursting of the expansion membrane due to uneven expansion.

[0022] Furthermore, it is preferable to further include a membrane attachment step before the second insertion step, in which a rubber spacer membrane having a shape complementary to the inner surface of the inflow channel is attached to the surface of the release membrane facing the inflow channel.

[0023] According to this configuration, the pressing of the lining material by the skirt portion against the outer surface of the inner cylinder portion and against the upper surface of the bottom plate portion can be elastically performed via the spacer film body, and the lining material can be attached so as to follow the shapes of the outer surface of the inner cylinder portion and the upper surface of the bottom plate portion. Similarly, even in the pressing of the lining material against the inner surface of the outer cylinder portion having a complex shape by the expansion portion, the lining material can be attached so as to follow this.

Brief Description of the Drawings

[0024] [Figure 1] It is a cross-sectional view of around the bowl trap (drain outlet) to be lined in the embodiment, which is a cross-sectional view (a) before repair and a cross-sectional view (b) after repair. [Figure 2] It is a side view of the first lining jig according to the embodiment, which is a side view (a) with the expansion film body removed and a side view (b) with the right half as a partial cross-section. [Figure 3] It is a side view of the second lining jig according to the embodiment, which is a side view (a) with the expansion film body removed and a side view (b) with the right half as a partial cross-section. [Figure 4] It is a diagram showing the polishing process in the method for repairing the drain outlet according to the embodiment. [Figure 5] It is a diagram showing the attachment process in the method for repairing the drain outlet according to the embodiment. [Figure 6] It is a diagram showing the pasting and setting process in the method for repairing the drain outlet according to the embodiment. [Figure 7] It is a diagram showing the first insertion process in the method for repairing the drain outlet according to the embodiment. [Figure 8] It is a diagram showing the first pressing process in the method for repairing the drain outlet according to the embodiment. [Figure 9] It is a diagram showing the pasting and mounting process in the method for repairing the drain outlet according to the embodiment. [Figure 10] It is a diagram showing the second insertion process in the method for repairing the drain outlet according to the embodiment. [Figure 11]This figure shows the second pressing step in the drain repair method according to the embodiment. [Figure 12] This diagram shows the removal process in the drain repair method according to the embodiment. [Modes for carrying out the invention]

[0025] The following describes a lining system according to one embodiment of the present invention and a method for repairing drains using the same, with reference to the attached drawings. In the bathrooms of older apartment buildings, bowl traps are used as drain fixtures, and as a measure against their deterioration, the drain is repaired by lining the inner surface of the flow path of the bowl trap. This allows for repairs around the bowl trap, which is embedded in the slab (floor slab), without having to chip away at the slab. In reality, in most cases, not only the bowl trap but also the connecting pipe directly below it is also deteriorating, so strictly speaking, the drain consisting of the bowl trap and the connecting pipe directly below it is being repaired.

[0026] On the other hand, a lining material made of fiber-reinforced material impregnated with resin (adhesive) is used to refurbish this drain. In this embodiment, a lining system is used to hold the lining material, which is attached to the flow path of the drain, in place until it hardens. This lining system includes a first lining jig used for lining the connecting pipe directly below and a second lining jig used for lining the bowl trap.

[0027] [Bowl trap] Figure 1(a) is a cross-sectional view of the drain before renovation, and Figure 1(b) is a cross-sectional view of the drain after renovation. As shown in both figures, the drain 1 has a main bowl trap 2 and a direct connecting pipe 3 connected to the bowl trap 2. Needless to say, the bowl trap 2 and the direct connecting pipe 3 are existing fixtures and have deteriorated, with rust, lumps, etc. (not shown) appearing on various parts. The bowl trap 2 is embedded in the slab S, and the direct connecting pipe 3 penetrates the slab S and is routed into the space below. The underside of the slab S is the ceiling surface of the floor below, and the direct connecting pipe 3 is connected to a vertical drain pipe (not shown) via a horizontal drain pipe 4 in this ceiling area.

[0028] As shown in Figure 1(a), the bowl trap 2 comprises a trap body 10 with a flange-shaped waterproof retaining portion 11 formed at the top, a bowl 12 provided to cover the trap body 10, a strainer support portion 13 extending upward from the trap body 10, and a strainer 14 detachably attached to the strainer support portion 13. The trap body 10 is embedded in the slab S with the waterproof retaining portion 11 pressing down on the waterproof layer WP. The strainer support portion 13 is screwed to the trap body 10 so that its height can be adjusted to match the thickness of the cinder concrete CC above the waterproof layer WP. In addition, the trap body 10, located above the waterproof retaining portion 11, has multiple drainage holes 15 formed therein to guide water that has leaked onto the waterproof layer WP into the trap body 10.

[0029] The trap body 10 is integrally formed (made of cast iron) by a bottom plate portion 10a, an outer cylinder portion 10b extending upward from the outer peripheral end of the bottom plate portion 10a, an inner cylinder portion 10c extending upward from the inner peripheral end of the bottom plate portion 10a, a connecting screw portion 10d extending downward from the inner peripheral end of the bottom plate portion 10a, and the aforementioned waterproof retaining portion 11 extending laterally from the upper part of the outer cylinder portion 10b. The connecting pipe 3 is screw-connected to the connecting screw portion 10d, which has a female thread. The inner cylinder portion 10c forms a water seal portion 17 between itself and the bowl 12 that is placed over it, performing the main function of the bowl trap 2. In other words, the wastewater flowing in from the strainer 14 flows down between the strainer support 13 and the outer cylinder 10b and the bowl 12, and then passes through the water seal 17 from below and flows down the inner surface of the inner cylinder 10c towards the connecting pipe 3 directly below.

[0030] The direct connecting pipe 3 is made of carbon steel pipe for piping and has a connecting short pipe 18 connected to the connecting threaded portion 10d of the trap body 10, and an L-shaped joint 19 (elbow) connected to the lower end of the connecting short pipe 18. A horizontal drain pipe 4 is connected to the L-shaped joint 19, and the downstream end of the horizontal drain pipe 4 is connected to a drain riser pipe (not shown). Around this drain outlet 1, rust tends to progress in three places: the entire inner cylinder portion 10c in contact with the water seal portion 17, the threaded joint portion between the connecting threaded portion 10d and the connecting short pipe 18, and the threaded joint portion between the connecting short pipe 18 and the L-shaped joint 19. However, in the repair method of this embodiment, lining is applied to the entire area of ​​the part that becomes the drainage flow path (see Figure 1(b)).

[0031] As shown in Figure 1(b), the main parts of the drainage flow path are the inlet flow path 21 of the trap body 10 including the water seal part 17 in the bowl trap 2, the outlet flow path 22 of the trap body 10 connected to the inlet flow path 21, and the internal flow path 23 of the connecting pipe 3 directly below connected to the outlet flow path 22. The inlet flow path 22a is a flow path mainly consisting of the trap body 10, with the inner surface of the strainer support part 13, the inner surface of the outer cylinder part 10b, the upper surface of the bottom plate part 10a, and the outer surface of the inner cylinder part 10c as the flow path inner surface. The outlet flow path 22a has the outer surface of the inner cylinder part 10c as the flow path inner surface, and the internal flow path 22b has the inner surface of the connecting short pipe 18 and the L-shaped joint 19 (the joint part) as the flow path inner surface. The outlet flow path 22a and the internal flow path 22b are of the same diameter and directly connected to form a straight pipe flow path 22.

[0032] As described above, the lining system 30 consists of a first lining jig 30A and a second lining jig 30B. In this case, the first lining jig 30A is used for lining the straight pipe section channel 22, which consists of an outflow channel 22a and an internal pipe channel 22b, and the second lining jig 30B is used for lining the inflow channel 21.

[0033] On the other hand, the lining material 25 is made by impregnating a fiber-reinforced material with resin, and has a complementary shape to the inner surface of the channel from the inlet channel 21 to the straight pipe channel 22, and is formed integrally with it. For the fiber-reinforced material, for example, polyester fibers woven into a funnel shape (tubular shape) are used, and for the resin, for example, a two-component epoxy resin (adhesive) is used.

[0034] Furthermore, release films 26A and 26B are interposed between the lining material 25 and the first lining jig 30A or the second lining jig 30B for the purpose of peeling (details will be described later). These release films 26A and 26B are, for example, made of polyethylene molded into a cylindrical shape. This prevents the first lining jig 30A and the second lining jig 30B from adhering to the lining material 25, and allows these jigs to be easily removed after the lining material 25 has hardened.

[0035] [First lining jig] Next, the first lining jig 30A will be described with reference to Figure 2, and the second lining jig 30B will be described with reference to Figure 3. As shown in Figures 2(a) and (b), the first lining jig 30A comprises a cylindrical first jig body 31 having an air supply port 33 at its upper end and an air chamber 34 inside, and a first expansion membrane 32 that covers the outer periphery of the first jig body 31 and has a gap space 35 that communicates with the air chamber 34.

[0036] The first jig body 31 has a supply port 33 made of a female coupler and a main body part 41 made of polyvinyl chloride. The female coupler has a check valve (not shown) incorporated into it, and a male coupler 38 provided on the air tube 37 on the air supply source side is attached to and detached (connected) (see Figure 8). When the male coupler 38 is connected to the female coupler (supply port 33) to supply air, the check valve opens, and when the male coupler 38 is disconnected (pulled out) from the female coupler, the check valve closes.

[0037] In this embodiment, air is supplied to inflate the first lining jig 30A and wait for the lining material 25 to harden (the resin to harden), but at this time the air tube 37 (male coupler 38) is removed. This prevents the air tube 37 from getting in the way when setting up the second lining jig 30B, and allows work using the first lining jig 30A and work using the second lining jig 30B to be performed continuously until the resin hardens. However, while waiting for the resin to harden, the air tube 37 is also removed from the second lining jig 30B.

[0038] The main body section 41 is formed in a bottomed cylindrical shape by combining straight pipes and various fittings made of polyvinyl chloride pipe. An air chamber 34 connected to the supply port 33 is formed throughout the entire interior of the main body section 41. The main body section 41 has a threaded joint section 42 to which the supply port 33 is joined, an upper joint section 43 connected to the threaded joint section 42, a body section 44 connected to the upper joint section 43, and a lower joint section 45 connected to the body section 44, and the air chamber 34 is formed inside these components.

[0039] The body 44 is made of straight pipe material from a polyvinyl chloride pipe, and its length is adjusted (cut to match) the length of the straight pipe flow path 22. The body 44 also has a plurality of communication holes 46 that connect the air chamber 34 and the gap space 35. Air supplied from the supply port 33 flows into the air chamber 34, and from this air chamber 34 flows into the gap space 35 through the plurality of communication holes 46. The first expansion membrane 32 then expands due to the air that flows into this gap space 35.

[0040] The upper joint portion 43 has two annular shallow grooves 43a, one above and one below. As will be described in detail later, the lower shallow groove 43a constitutes part of the upper annular seal portion 51 of the first expansion membrane 32. Similarly, the lower joint portion 45 has two annular shallow grooves 45a, one above and one below. In this case as well, the lower shallow groove 45a constitutes part of the lower annular seal portion 51 of the first expansion membrane 32.

[0041] The first expansion membrane 32 is made of cylindrical rubber (rubber tube). The first expansion membrane 32 has two annular sealing portions 51 at both the upper and lower ends that maintain airtightness with the first jig body 31, and a body expansion portion 52 (expansion portion) formed between the two annular sealing portions 51 that corresponds to the length of the straight pipe flow path 22. The first expansion membrane 32 also has a pair of upper and lower folded portions 53 that are folded and overlapped at each annular sealing portion 51.

[0042] The upper annular seal portion 51 is constructed by tying the upper end of the first expansion membrane 32 to the shallow groove 43a of the upper joint portion 43 with a string-like body 55. Similarly, the lower annular seal portion 51 is constructed by tying the lower end of the first expansion membrane 32 to the shallow groove 45a of the lower joint portion 45 with a string-like body 55. The upper and lower ends of the first expansion membrane 32, which are tied with the string-like body 55, are folded back to form a pair of folded-back portions 53.

[0043] As described above, the body expansion section 52 has a length corresponding to the straight pipe section flow path 22. In this embodiment, the specific length of the straight pipe section flow path 22 is from the upper end of the inner cylinder section 10c through the connecting short pipe 18 to the joint end of the L-shaped joint 19. The body expansion section 52 is formed to be slightly longer than the length of the straight pipe section flow path 22 (see Figure 8). This ensures that the bent and cut ends of the lining material 25 are properly pressed, preventing wrinkles and air trapping (floating) at each end. In addition, the pair of folded sections 53 suppress expansion at both outer ends of the body expansion section 52. That is, the expanding body expansion section 52 comes into contact with the lining material 25 from the upper and lower middle section. As a result, air trapped in the lining material 25 is pushed out (sent out) towards both outer ends of the body expansion section 52, preventing the lining material 25 from floating.

[0044] The expansion section 52 of the body expands to a shape approximately complementary to the inner surface of the flow path 22 of the straight pipe section by the air supplied to the gap space 35. The expansion width in this case, that is, the radial expansion width of the first expansion membrane 32 (body expansion section 52) for attaching the lining material 25, is approximately 10 mm (see Figure 8). As a result, when inserting the first lining jig 30A, the first expansion membrane 32 does not get caught on the edge of the lining material 25, and the expansion width of the first expansion membrane 32 can be kept as narrow as possible, allowing the lining material 25 to be pressed stably and uniformly.

[0045] Thus, in the first lining jig 30A, when air is supplied, the expansion section 52 of the body expands to a shape substantially complementary to the inner surface of the straight pipe section flow path 22, pressing against the lining material 25. Therefore, the pressing force of the expansion section 52 that presses the lining material 25 against the inner surface of the straight pipe section flow path 22 acts uniformly and simultaneously throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material 25 of the straight pipe section flow path 22 can be prevented as much as possible.

[0046] [Second lining jig] As shown in Figures 3(a) and (b), the second lining jig 30B comprises a large-diameter, substantially cylindrical second jig body 61 having an air supply port 63 and an air chamber 64 connected thereto at its upper part, and a second expansion membrane 62 that covers the outer periphery of the second jig body 61, with a gap space 65 communicating with the air chamber 64.

[0047] The second jig body 62 has a supply port 63 made of a female coupler and a main body part 71 made of polyvinyl chloride. The female coupler has a check valve (not shown) incorporated into it, and a male coupler (not shown) provided on the air tube (not shown) on the air supply source side can be attached to and detached from it. When the male coupler is connected to the female coupler to supply air, the check valve opens, and when the male coupler is disconnected from the female coupler (pulled out), the check valve closes.

[0048] The main body portion 71 is formed in a substantially cylindrical shape by combining straight pipes and various fittings of polyvinyl chloride pipe. The main body portion 71 has an upper air chamber forming portion 72 to which a supply port 63 is joined and which forms an air chamber 64 inside, a jig housing portion 73 which is connected to the lower side of the air chamber forming portion 72 and which accommodates the upper part of the first lining jig 30A when the second lining jig 30B is set in the bowl trap 2, and a skirt portion 74 which is connected to the lower side of the jig housing portion 73.

[0049] A female coupler constituting the supply port 63 is screwed to the upper end of the air chamber forming section 72, and a plurality of communication holes 75 (four in this embodiment) are formed at the lower end, connecting the air chamber 64 and the gap space 65. The plurality of communication holes 75 are evenly arranged in the circumferential direction and penetrate the lower end of the air chamber forming section 72 at an angle (see Figure 3(b)). Air supplied from the supply port 63 flows into the air chamber 64, and from this air chamber 64 flows into the gap space 65 through the plurality of communication holes 75.

[0050] The jig housing section 73 constitutes a cylindrical space that is airtightly separated from the air chamber 64 by a partition wall 76. The jig housing section 73 houses the upper exposed portion of the first lining jig 30A facing the straight pipe section 22, with its lower part (skirt section 74) inserted into the inlet section flow path 21 (see Figure 10). This makes it possible to set the second lining jig 30B with the first lining jig 30A already set up.

[0051] The skirt portion 74 is connected to the lower end of the jig housing portion 73 and is formed in a slightly flared shape. The skirt portion 74 is the part that is inserted into the bowl trap 2, that is, the part that is inserted into the inflow channel 21 with its lower end abutting against the upper surface of the bottom plate portion 10a of the trap body 10 (see Figure 10).

[0052] The outer circumferential surface of the skirt portion 74 faces the inner surface of the strainer support portion 13 and the inner surface of the outer cylinder portion 10b (trap body 10). The inner circumferential surface of the skirt portion 74 is formed in a shape substantially complementary to the outer surface of the inner cylinder portion 10c, so as it is inserted into the inlet passage 21, it presses the lining material 25 against the outer surface of the inner cylinder portion 10c. Similarly, the lower end surface of the skirt portion 74 presses the lining material 25 against the upper surface of the bottom plate portion 10a as it is inserted into the inlet passage 21. In addition, multiple slits 78 cut from below are formed at the lower end of the skirt portion 74 (see Figure 3(b)), so that when the lining material 25 is pressed against the bottom plate portion 10a by the skirt portion 74, the air contained in the lining material 25 can escape to the outside of the skirt portion 74 through these slits 78.

[0053] On the other hand, two annular shallow grooves 72a are formed on the lower outer circumferential surface of the air chamber forming portion 72, one above and one below. As will be described in detail later, the lower shallow groove 72a constitutes part of the upper annular seal portion 81 of the second expansion membrane 62. Similarly, two annular shallow grooves 74a are formed on the lower outer circumferential surface of the skirt portion 74, one above and one below. In this case as well, the lower shallow groove 74a constitutes part of the lower annular seal portion 81 of the second expansion membrane 62.

[0054] The second expansion membrane 62 is made of cylindrical rubber (rubber tube). The second expansion membrane 62 has two annular seal portions 81 at both the upper and lower ends that maintain airtightness with the second jig body 61, a lower expansion portion 82 (expansion portion) that covers the outer circumference of the skirt portion 74 and expands by air to a shape substantially complementary to the inner surface of the strainer support portion 13 and the inner surface of the outer cylinder portion 10b, and an expansion suppression portion 83 that covers the outer circumference of the second jig body 61 excluding the skirt portion 74 and guides the air from the air chamber 64 to the lower expansion portion 82 while expansion is suppressed.

[0055] The upper annular seal portion 81 is constructed by tying the upper part of the second expansion membrane 62 to the shallow groove 72a of the air chamber forming portion 72 with a string-like body 85. Similarly, the lower annular seal portion 81 is constructed by tying the lower end of the second expansion membrane 62 to the shallow groove 74a of the skirt portion 74 with a string-like body 85. Between these two annular seal portions 81, a gap space 65 is formed through which air is supplied between the main body portion 71 and the second expansion membrane 62.

[0056] In this case, the second expansion membrane 62 is placed with one end over the skirt portion 74 and tied to the shallow groove 74a, then the second expansion membrane 62 is inverted with some slack (slack portion 82a, described later) and placed over the jig housing portion 73 and the air chamber forming portion 72. Next, the second expansion membrane 62 is tied to the shallow groove 72a portion of the air chamber forming portion 72, and from this point, it is folded back and overlapped further outwards.

[0057] The folded extension portion 86 of the folded and overlapped second expansion membrane 62 is designed to reach the vicinity of the skirt portion 74. Furthermore, a cylindrical piece 87 of the second expansion membrane 62 (material) is placed over the upper side of the folded extension portion 86 from the air chamber forming portion 72 to the jig housing portion 73. In other words, the lower expansion portion 82 is formed by the single layer of the second expansion membrane 62 covering the skirt portion 74, and the expansion suppression portion 83 is formed by the folded extension portion 86 where the second expansion membrane 62 is double-layered and the piece 87 where the second expansion membrane 62 is triple-layered.

[0058] When air is supplied from the supply port 63, the air is guided to the gap space 65 via the air chamber 64. In this case, the gap space 65 is formed not only in the lower expansion section 82 but also in the expansion suppression section 83. However, the expansion of the expansion suppression section 83 is suppressed, and the lower expansion section 82 expands to a shape that is substantially complementary to the inner surface of the strainer support section 13 and the inner surface of the outer cylinder section 10b. That is, the air supplied to the gap space 65 is guided to the lower expansion section 82 via the expansion suppression section 83, causing the lower expansion section 82 to expand (see Figure 11).

[0059] In this case, the lower expansion portion 82 covers the skirt portion 74 with an annular slack portion 82a (see Figure 3(b)), and including the annular step portion between the strainer support portion 13 and the outer cylinder portion 10b, it expands to a shape substantially complementary to the inner surface of the strainer support portion 13 and the inner surface of the outer cylinder portion 10b. As a result, the expanded lower expansion portion 82 presses the lining material 25 against the inner surface of the strainer support portion 13 and the inner surface of the outer cylinder portion 10b, causing it to adhere.

[0060] Thus, when the second lining jig 30B is inserted into the inlet passage 21, the inner circumferential surface of the skirt portion 74, which has a shape substantially complementary to the outer surface of the inner cylinder portion 10c, presses the lining material 25 against the outer surface of the inner cylinder portion 10c, and the lower end surface of the skirt portion 74 presses the lining material 25 against the upper surface of the bottom plate portion 10a. Subsequently, when air is supplied, the lower expansion portion 82 expands to a shape substantially complementary to the inner surface of the outer cylinder portion 10b, pressing the lining material 25 against the inner surface of the outer cylinder portion 10b. As a result, the pressing force that presses the lining material 25 against the inner surface of the inlet passage 21 acts substantially uniformly throughout the entire area. Therefore, the occurrence of wrinkles and lifting in the lining material 25 of the inlet passage 21 can be prevented as much as possible.

[0061] [How to repair a drain] Here, with reference to Figures 4 to 12, a method for repairing the drain outlet 1 using the lining system 30, which consists of a first lining jig 30A and a second lining jig 30B, will be described. The drain outlet 1 consists of a bowl trap 2 and a direct connecting pipe 3 connected to the bowl trap 2. As described above, this repair method involves lining the inner surface of the flow path 22 of the straight pipe section and the inner surface of the flow path 21 of the inlet section.

[0062] In this modification method, a single lining material 25 is used to cover the inlet channel 21 and the straight pipe channel 22. A first release membrane 26A is interposed between the lining material 25 and the first lining jig 30A, and a second release membrane 26B is interposed between the lining material 25 and the second lining jig 30B. In addition, a silicone rubber spacer membrane 27 is attached to the top (surface) of the second release membrane 26B. Furthermore, a short polyvinyl chloride pipe 28 is set on the upper side of the inner cylinder 10c so as to surround the upper end of the protruding body expansion portion 52.

[0063] The method for repairing the drain outlet 1 in this embodiment includes a polishing step (see Figure 4) to remove rust and lumps from the inner surface of the inlet channel 21 and the inner surface of the straight pipe channel 22; an attachment step (see Figure 5) to attach the lining material 25 to the inner surface of the inlet channel 21 and the inner surface of the straight pipe channel 22; an attachment and setting step (see Figure 6) to attach the first release film 26A to the surface of the lining material 25 and set the short pipe 28; a first insertion step (see Figure 7) to insert and set the first lining jig 30A into the straight pipe channel 22; a first pressing step (see Figure 8) to supply air to the first lining jig 30A to inflate the first expansion film 32; and a connection to it from the supply port 33. The system includes a detachment step of removing the attached air tube 37, an attachment / installation step (see Figure 9) in which a second release film 26B is attached to the surface of the lining material 25 in the inlet passage 21 and a spacer film 27 is attached to the surface of the second release film 26B, a second insertion step (see Figure 10) in which the second lining jig 30B is inserted and set in the inlet passage 21, a second pressing step (see Figure 11) in which air is supplied to the second lining jig 30B to inflate the second expansion film 62, a curing / curing step in which the resin in the lining material 25 is cured, and a removal step (see Figure 12) in which the first lining jig 30A, the second lining jig 30B, etc. are removed after the air is released.

[0064] In the polishing process, an electric drill equipped with a chain-attached polishing bit 91 is used to polish the inner surfaces of the inlet channel 21 and the straight pipe channel 22 (mainly the inner surface of the trap body 10 and the inner surface of the connecting short pipe 18) to remove rust, lumps, etc. (see Figure 4). In parallel with the polishing, dust is removed by suction, etc., and the inner surfaces of the trap body 10 and the connecting short pipe 18 are cleaned. As a result, the inner surfaces of the trap body 10 and the connecting short pipe 18 are left bare.

[0065] The attachment process includes a step of impregnating the fiber reinforcement material with resin beforehand (pre-process) and a step of manually attaching the resin-impregnated lining material 25 to the inner surface of the inlet channel 21 and the straight pipe channel 22 (post-process: see Figure 5). In the pre-process, a funnel-shaped fiber reinforcement material is placed in a transparent polyester bag, and a two-liquid resin mixture is poured into the fiber reinforcement material. Next, a hand roller is used to squeeze the fiber reinforcement material from above the bag to ensure uniform impregnation with resin (while simultaneously removing air bubbles).

[0066] In the next step, the lower half of the lining material 25 removed from the bag is inserted into the straight pipe section flow path 22. Subsequently, the tapered portion is folded back at the upper end of the inner cylinder section 10c and attached to the outer surface of the inner cylinder section 10c, and the remaining portion is then attached to the upper surface of the bottom plate section 10a, the inner surface of the outer cylinder section 10b, and the inner surface of the strainer support section 13.

[0067] The attachment and setting process includes the step of attaching a cylindrical first release film 26A to the surface of the lining material 25 of the straight pipe section flow path 22 (attachment process), and the step of setting the short pipe 28 on the upper end of the inner cylinder section 10c (actually, seated on the lining material 25) (pipe setting process) (see Figure 6). In this case, the short pipe 28 is made of a polyvinyl chloride pipe piece with the same diameter (same inner diameter) as the straight pipe section flow path 22, and is set coaxially with the straight pipe section flow path 22.

[0068] In the first insertion step, the first lining jig 30A is inserted from above into the straight pipe section channel 22, which contains the lining material 25 and the first release membrane 26A (see Figure 7). Insertion and setting are completed when the tip of the first jig body 31 abuts against the L-shaped joint 19 as the insertion of the first lining jig 30A progresses. At this point, an air tube 37 is connected to the supply port of the first lining jig 30A.

[0069] In the first pressing step, the main valve on the air supply source side is opened to supply air to the first lining jig 30A (see Figure 8). As a result, the first expansion membrane 32 (body expansion section 52) expands to a shape substantially complementary to the inner surface of the straight pipe section flow path 22, and adheres to the inner surface of the straight pipe section flow path 22 by pressing down on the lining material 25. In this case, the expansion of the body expansion section 52 is received at its upper end by the inner cylinder section 10c and the short pipe 28 that follows it, so that wrinkles or the like do not occur in the folded portion of the lining material 25. Furthermore, bursting of the body expansion section 52 is also prevented.

[0070] In the detachment process, the air tube 37, which was connected to the supply port 33 of the first lining jig 30A, is disconnected. That is, the male coupler 38 on the air tube 37 side is disconnected from the female coupler, which is the supply port 33. As a result, the check valve of the female coupler functions, and the state in which air is supplied to the first lining jig 30A is maintained, that is, the state in which the lining material 25 is pressed down and adheres to the inner surface of the flow path 22 of the straight pipe section.

[0071] The attachment and mounting process includes the step of attaching a funnel-shaped second release film 26B to the surface of the lining material 25 of the inflow channel 21 (attachment step) and the step of mounting a spacer film 27 to the surface of the second release film 26B (film mounting step) (see Figure 9). In this case, the main parts of the second release film 26B and the spacer film 27 are formed in a shape complementary to the inner surface of the inflow channel 21. When the spacer film 27 is mounted, the lining material 25 and the second release film 26B are temporarily held in place in the inflow channel 21.

[0072] In the second insertion step, the second lining jig 30B is inserted into the inlet passage 21 (strainer support 13 and trap body 10) from above (see Figure 10). As the second lining jig 30B is inserted into the inlet passage 21, the inner circumferential surface of the expanding skirt portion 74 presses the lining material 25 downwards, stretching it with the second release membrane 26B and spacer membrane 27 in between, against the outer surface of the inner cylinder portion 10c. Subsequently, the lower end surface of the skirt portion 74 presses the lining material 25 with the second release membrane 26B and spacer membrane 27 in between against the upper surface of the bottom plate portion 10a.

[0073] In other words, when the second lining jig 30B is seated on the upper surface of the bottom plate portion 10a, the lining material 25 is pressed against the inner cylinder portion 10c and the bottom plate portion 10a, completing the insertion and setting of the second lining jig 30B. In this case, since the lining material 25 is pressed with the rubber spacer membrane 27 in between, the lining material 25 can be attached to the boundary between the inner cylinder portion 10c and the bottom plate portion 10a without any gaps. At the same time, air around the lining material 25 can be pushed out to the outside through the slit 78 of the skirt portion 74. Here, an air tube (not shown) is connected to the supply port 63 of the second lining jig 30B.

[0074] In the second pressing step, the main valve on the air supply source side is opened to supply air to the second lining jig 30B (see Figure 11). As a result, the second expansion membrane 62 (lower expansion portion 82) expands to a shape approximately complementary to the inner surface of the strainer support portion 13 and the inner surface of the outer cylinder portion 10b, pressing and adhering the lining material 25 to the inner surface of the strainer support portion 13 and the inner surface of the outer cylinder portion 10b. In particular, the lining material 25 is pressed so that the slack portion 82a of the lower expansion portion 82 corresponds to the annular step between the strainer support portion 13 and the outer cylinder portion 10b. Once the air supply is finished, the air tube connected to the supply port 63 of the second lining jig 30B is removed, and the process proceeds to the hardening and curing step.

[0075] In the curing and hardening process, the lining material 25 is heated while waiting for it to harden. In this embodiment, hot air is blown in (using a repurposed futon dryer), and the lining material 25 (resin) hardens in approximately 3 hours. Once the lining material 25 has hardened, the process moves on to the removal process.

[0076] In the removal process, first, the air is released from the second lining jig 30B and it is removed, and then the air is released from the first lining jig 30A and it is removed. Next, the spacer film 27 and the second release film 26B are removed by peeling them off. Furthermore, the short pipe 28 and the first expansion film 26A are removed (see Figure 12).

[0077] Furthermore, if burrs or other irregularities occur on the upper end of the hardened lining material 25, it is preferable to polish this area to a surface finish and then apply resin with a brush to finish it (finishing process).

[0078] Thus, in this drain repair method, when air is supplied during the first pressing step, the expanded section 52 of the body expands to a shape that is substantially complementary to the straight pipe passage 22. Therefore, the pressing force of the expanded section 52 that presses the lining material 25 against the straight pipe passage 22 acts uniformly and simultaneously throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material 25 can be prevented as much as possible.

[0079] Furthermore, in the second insertion step, the inner circumferential surface of the skirt portion 74, which is formed in a shape substantially complementary to the outer surface of the inner cylinder portion 10c, presses the lining material 25 against the outer surface of the inner cylinder portion 10c, and the lower end surface of the skirt portion 74 presses the lining material 25 against the upper surface of the bottom plate portion 10a. Furthermore, in the second pressing step, when air is supplied, the lower expansion section 82 expands to a shape substantially complementary to the inner surface of the outer cylinder section 10b. As a result, the pressing force that presses the lining material 25 against the inflow channel 21 acts substantially uniformly throughout the entire area. Therefore, the occurrence of wrinkles and lifting in the lining material 25 of the inflow channel 21 can be prevented as much as possible. [Explanation of symbols]

[0080] 1…Drain outlet, 2…Bowl trap, 3…Direct connection pipe, 10…Trap body, 13…Strainer support, 10a…Bottom plate, 10b…Outer cylinder, 10c…Inner cylinder, 17…Water seal, 21…Inflow channel, 22…Straight pipe channel, 22a…Outflow channel, 22b…Inside pipe channel, 25…Lining material, 26A…First release membrane, 26B…Second release membrane, 27…Spacer membrane, 28…Short pipe, 30…Lining system, 30A…First lining jig, 30B…Second lining jig, 31…First jig body, 32…First expansion membrane, 33…Supply port, 34…Air chamber, 35…Gap Interval, 37...Air tube, 38...Male coupler, 41...Main body part, 43a...Shallow groove, 45a...Shallow groove, 46...Communication hole, 51...Annular seal part, 52...Body expansion part, 53...Folded part, 55...String-like body, 61...Second jig body, 62...Second expansion membrane, 63...Supply port, 64...Air chamber, 65...Gap space, 71...Main body part, 72...Air chamber forming part, 72a...Shallow groove, 73...Jig housing part, 74...Skirt part, 74a...Shallow groove, 75...Communication hole, 78...Slit, 81...Annular seal part, 82...Lower expansion part, 82a...Slack part, 83...Expansion suppression part, 85...String-like body, 86...Folded extension part,

Claims

1. A lining system comprising a bowl trap and a connecting pipe directly below the bowl trap, wherein a lining material made of fiber-reinforced material impregnated with resin is attached to the inner surface of the flow path of the drain outlet, the system comprising a bowl trap and a connecting pipe directly below the bowl trap, A first lining jig for attaching the lining material to the inner surface of the straight pipe section of the trap body, which consists of the outflow section and the internal pipe section, among the inflow section of the trap body including the water seal section in the bowl trap, the outflow section of the trap body connected to the inflow section, and the internal pipe section of the connecting pipe directly below connected to the outflow section, The device comprises a second lining jig for adhering the lining material to the inner surface of the inflow channel, which consists of the inner surface of the outer cylinder, the upper surface of the bottom plate, and the outer surface of the inner cylinder. The first lining jig is, A cylindrical first jig body having an air supply port at its upper end and an air chamber connected to the supply port inside, The first jig body covers the outer periphery of the first jig body, leaving a gap space that communicates with the air chamber, and includes a first expansion membrane that expands in accordance with the inner surface of the flow path of the straight pipe section by air supplied from the supply port via the air chamber, The first expansion membrane has two annular sealing portions at both its upper and lower ends that maintain airtightness with the first jig body, and an expansion portion formed between the two annular sealing portions that has a length corresponding to the flow path of the straight pipe section. The second lining jig is, A substantially cylindrical second jig body having an air supply port and an air chamber connected thereto at the top, and a skirt portion at the bottom that is inserted into the inflow channel so as to abut against the upper surface of the bottom plate, It has a second expansion membrane that covers the outer periphery of the second jig body, leaving a gap space that communicates with the air chamber, and expands with air supplied from the supply port through the air chamber, The inner circumferential surface of the skirt portion is formed in a shape that conforms to the outer surface of the inner cylinder portion. The lining system is characterized in that the second expanding membrane has two annular sealing portions at both the upper and lower ends that maintain airtightness with the second jig body, an expanding portion that covers the outer circumference of the skirt portion and expands by air to conform to the inner surface of the outer cylinder portion, and an expansion suppression portion that covers the outer circumference of the second jig body excluding the skirt portion and guides the air from the air chamber to the expanding portion in a state where expansion is suppressed.

2. The lining system according to claim 1, characterized in that the radial expansion width of the first expandable membrane for attaching the lining material is approximately 10 mm.

3. The lining system according to claim 1, characterized in that the first expanding membrane has a pair of folded portions that are folded and overlapped at each of the annular sealing portions.

4. The lining system according to claim 1, characterized in that the expansion suppression portion is composed of a folded extension portion of the second expansion membrane body that is folded back and overlapped at the annular sealing portion at the upper end.

5. The lining system according to claim 1, characterized in that the second jig body further has a jig housing portion for housing the upper exposed portion of the first lining jig facing the straight pipe section when the lower part is inserted into the inflow section passage.

6. A method for repairing an existing drain outlet, comprising a bowl trap and a connecting pipe directly below the bowl trap, using the lining system described in claim 1, An attachment step of attaching the lining material to the inner surface of the flow channel of the inlet section and the inner surface of the flow channel of the straight pipe section, The process involves attaching a release film for peeling to the surface of the lining material, The first insertion step involves inserting and setting the first lining jig into the flow path of the straight pipe section, A first pressing step involves supplying air to the first lining jig and pressing the lining material with the first expansion membrane to adhere it to the inner surface of the flow path in the straight pipe section, A detachment step involves closing the supply port and disconnecting the air tube connected to the supply port, A second insertion step involves inserting and setting the second lining jig into the inflow channel, A second pressing step involves supplying air to the second lining jig and pressing the lining material with the second expansion membrane to adhere it to the inner surface of the inlet channel, A curing and curing process for hardening the resin in the lining material, A method for repairing a drain port, characterized by comprising a removal step of removing the first lining jig, the second lining jig, and the release film after releasing the air.

7. In the first insertion step, the first lining jig is inserted and set such that the upper end of the expansion portion protrudes from the upper end of the straight pipe section flow path. The method for repairing a drain outlet according to claim 6, further comprising a pipe setting step between the first insertion step and the first pressing step, in which a short pipe, which surrounds the upper end of the protruding expansion portion and is formed to have the same diameter as the straight pipe section flow path, is set coaxially with the straight pipe section flow path.

8. The method for repairing a drain port according to claim 6, further comprising a membrane attachment step of attaching a rubber spacer membrane having a shape complementary to the inner surface of the inlet channel to the surface of the release membrane facing the inlet channel, prior to the second insertion step.

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