Lining jig and method for repairing drain pipes using the same

Abstract

To provide a lining jig, etc., that can prevent wrinkles and floating in a lining material as much as possible.SOLUTION: A straight pipe lining jig 20A for attaching a lining material 11A to an inner surface of a straight pipe part 10A includes: a rigid, straight-shaped jig body 21 having an air supply port 23 and an air chamber 24 formed therein; and an inflatable membrane body 22 that covers an outer periphery of the jig body 21 with a clearance space 25 communicating with the air chamber 24 and inflates with air into a shape approximately complementary to the inner surface of the straight pipe part 10A. The inflatable membrane body 22 has: two annular seal parts 41 at both ends that maintain airtightness between the jig body 21 and the seal parts, and a straight inflatable part 42 of a length corresponding to the straight pipe part formed between the two annular seal parts 41.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a lining jig for lining straight pipe portions and curved pipe portions of existing pipes, and a method for repairing drainage pipes using the same.

Background Art

[0002] Conventionally, as this type of lining jig and a method for repairing drainage pipes, a pressing tube for lining existing pipes around a trap (bowl trap) and a production method for drainage pipes are known (see Patent Document 1). In this case, a pressing tube for a straight pipe portion for lining a reinforcing member in which a cloth is impregnated with resin on the inner peripheral surface of the inner cylinder of the trap and the vertical pipe connected thereto, and a pressing tube for a curved pipe portion for lining a reinforcing member at the confluence of the drainage vertical pipe and the drainage branch pipe are prepared. The pressing tube for the straight pipe portion includes a vinyl chloride support member having a gas flow path inside, an expansion member body made of synthetic rubber in which both ends are airtightly welded to both ends of the support member and a sealed space for gas is formed inside, and a heater disposed in the sealed space. A gas supply pipe connected to a gas supply source is attached to one end of the support member. In addition, a plurality of gas supply holes communicating the gas flow path and the sealed space of the expansion member body are formed in the main body portion of the support member serving as the gas supply portion. In this pressing tube, by supplying a gas such as air into the sealed space through the support member, it expands into a rugby ball shape. When lining the straight pipe portion around the trap, first, a reinforcing member in which a cloth is impregnated with resin is attached to this straight pipe portion, and a thin film made of polyethylene is attached. Next, a pressing tube is inserted into this portion, and after positioning, gas is supplied. When the gas is supplied, the expansion member body expands and presses the reinforcing member radially outward with the thin film sandwiched between it and the straight pipe portion. Then, while maintaining this pressing state, the heater is lit to cure the resin. On the other hand, the compression tube for the curved section comprises an expansion member formed in the shape of a bag out of rubber or the like, a fixing cap that fixes (closes) the upper end of the expansion member to form a sealed space, a gas supply tube with a gas supply hole that penetrates the fixing cap and supplies gas into the sealed space, and a heater disposed within the sealed space. In this compression tube, supplying gas into the sealed space via the gas supply tube causes it to expand into a tapered bag shape. When lining the curved section around a drain riser, first, a reinforcing member made of cloth impregnated with resin is attached to the curved section, and a thin polyethylene film is also attached. Next, a pressure tube is inserted into this section, positioned, and then gas is supplied. When gas is supplied, the expansion member expands and presses the reinforcing member radially outward against the curved section, sandwiching the thin film between them. Then, while maintaining this pressure, the heater is turned on to cure the resin. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 3797989 [Overview of the project] [Problems that the invention aims to solve]

[0004] In conventional lining technologies, the compression tube for straight pipe sections expands and presses the reinforcing member (lining material) and thin film against the straight inner surface. In this case, while the inner surface shape of the straight pipe section is cylindrical, the compression tube expands into a rugby ball shape. Therefore, during the expansion process of the compression tube, that is, from the time the compression tube contacts the inner surface of the straight pipe section until it presses against it, the contact area may shift or the pressure may become uneven. As a result, wrinkles or lifting may occur in the reinforcing member (lining material), or the compression tube may burst. Similarly, with the compression tubes for curved sections, the inner circumferential shape of the straight section differs from the external shape of the compression tube when expanded, which could cause wrinkles or lifting in the reinforcing member (lining material), or even cause the compression tube to burst. If wrinkles or lifting occur in the reinforcing material (lining material), obstacles that disrupt the flow will be created on the inner surface of the drainpipe, which has been reduced in diameter by the lining material, leading to drain blockages.

[0005] The present invention aims to provide a lining jig that can minimize the occurrence of wrinkles and lifting in the lining material, and a method for repairing drain pipes using the same. [Means for solving the problem]

[0006] The lining jig of the present invention is a lining jig for attaching a lining material, which is a fiber-reinforced material impregnated with resin, to the inner surface of a straight pipe section of a pipe, and comprises a rigid, straight jig body having an air supply port at one end and an air chamber connected to the supply port inside, and an expandable membrane covering the outer circumference of the jig body with a gap space communicating with the air chamber, which expands to a shape substantially complementary to the inner surface of the straight pipe section by air supplied from the supply port through the air chamber, wherein the expandable membrane has two annular sealing portions at both ends that maintain airtightness with the jig body, and an expandable portion between the two annular sealing portions that has a length corresponding to the straight pipe section.

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

[0008] Another lining jig of the present invention is a lining jig for attaching a lining material, which is a fiber-reinforced material impregnated with resin, to the inner surface of a curved pipe section, and comprises a flexible and curved jig body having an air supply port at one end and an air chamber connected to the supply port inside, and an expandable membrane covering the outer circumference of the jig body with a gap space communicating with the air chamber, which expands to a shape substantially complementary to the inner surface of the curved pipe section by air supplied from the supply port through the air chamber, wherein the expandable membrane has two annular sealing portions at both ends that maintain airtightness with the jig body, and an expandable portion between the two annular sealing portions that has a length corresponding to the curved pipe section.

[0009] In this configuration, when air is supplied from the supply port, the air flows through the air chamber into the gap between the jig body and the expansion membrane, inflating the expansion portion of the expansion membrane. The expansion portion expands to a shape approximately complementary to the inner surface of the curved pipe, pressing the lining material against the inner surface of the curved pipe. In this case, because the expansion portion expands to a shape approximately complementary to the inner surface of the curved pipe, the pressing force of the expansion portion against the inner surface of the curved pipe acts uniformly and simultaneously throughout the entire area. Therefore, the occurrence of wrinkles and lifting in the lining material can be prevented as much as possible.

[0010] In these cases, it is preferable that the radial expansion width of the expandable membrane for attaching the lining material is around 10 mm.

[0011] With this configuration, when inserting the lining jig into a straight or curved section of a pipe where the lining material has been manually applied, the expansion membrane does not get caught on the edge of the lining material, and the expansion width of the expansion membrane can be kept as narrow as possible. As a result, the lining material can be pressed stably and uniformly without compromising workability.

[0012] Furthermore, it is preferable that each annular sealing portion is constructed by tying the end of the expandable membrane to the outer circumference of the jig body with a string-like material.

[0013] With this configuration, by simply tying a portion of the expandable membrane to the outer circumference of the jig body, the sealing portions at both ends of the expandable section can be formed. In other words, an expandable membrane that expands to a desired shape can be easily constructed, and a lining jig can be manufactured easily and at low cost.

[0014] In this case, it is preferable that annular shallow grooves are formed on the outer circumference of the jig body, corresponding to the positions where the string-like body is tied.

[0015] This configuration clearly defines the attachment points for the string-like material, allowing for more efficient attachment work. Furthermore, it improves the sealing performance achieved through attachment.

[0016] Furthermore, it is preferable that the expanded membrane has a pair of folded portions that are folded and overlapped at each annular sealing portion.

[0017] 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, from the middle section in the direction of extension, contacts and presses against the inner surface of the straight section and the curved section. 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.

[0018] On the other hand, the supply port is preferably composed of a female coupler with a check valve, and the check valve is opened by connecting the male coupler on the air supply source side to the female coupler and closed by disconnecting the connection.

[0019] According to this configuration, when the male coupler on the air supply source side is removed (connection released) from the female coupler of the jig body while the expansion film body is inflated by the supply of air and the lining material is held, the check valve functions and the air supply state is maintained. That is, even when the connection of the male coupler is released, the pressing state of the lining material is automatically maintained, and it is possible to shift to a state of waiting for the resin to cure. Thereby, when the lining work extends over a plurality of locations, the lining work can be carried out efficiently and smoothly.

[0020] The method for repairing a drain pipe of the present invention is a method for repairing a drain pipe using the lining jig of claim 1 and performing lining on a straight pipe portion of an existing drain pipe, comprising an attaching step of attaching a lining material to the inner surface of the straight pipe portion, a pasting step of pasting a release film body for peeling on the surface of the lining material, an inserting step of inserting and setting the lining jig into the straight pipe portion, a pressing step of supplying air to the lining jig and pressing the lining material against the inner surface of the straight pipe portion by the expansion film body, a curing and curing step of curing the resin in the lining material, and a removing step of removing the lining jig and the release film body from the straight pipe portion after discharging the air.

[0021] According to this configuration, in the pressing step, when air is supplied, the expansion portion expands into a substantially complementary shape to the inner surface of the straight pipe portion. Therefore, the pressing force of the expansion portion that presses the lining material against the inner surface of the straight pipe portion acts uniformly and simultaneously over the entire area. Therefore, it is possible to prevent the occurrence of wrinkles and floating in the lining material as much as possible.

[0022] In this case, in the inserting step, the lining jig is inserted and set with the end portion of the expansion portion protruding from the end of the straight pipe portion, and between the inserting step and the pressing step, a pipe setting step of setting a short pipe formed to have the same diameter as the straight pipe portion coaxially with the straight pipe portion while surrounding the end portion of the protruding expansion portion is preferably further provided.

[0023] According to this configuration, the lining jig is inserted and set such that the end of the expansion part protrudes from the end of the straight pipe part, and a short pipe is set so as to surround this part. Therefore, the lining material at the end of the straight pipe part can be made into a good finish state. Further, the expansion form of the expansion film body can be made into a straight shape including the end part, and the bursting of the expansion film body due to non-uniform expansion can be effectively prevented.

[0024] Another method for repairing a drain pipe of the present invention is a method for repairing a drain pipe in which lining is performed on a curved pipe part of an existing drain pipe using the lining jig according to claim 2, the method including: an attaching step of attaching a lining material to the inner surface of the curved pipe part; a pasting step of pasting a release film body for peeling on the surface of the lining material; an inserting step of inserting and setting the lining jig into the curved pipe part; a pressing step of supplying air to the lining jig and pressing the lining material against the inner surface of the curved pipe part by means of the expansion film body; a curing and curing step of curing the resin in the lining material; and a removing step of removing the lining jig and the release film body from the curved pipe part after the air is removed.

[0025] According to this configuration, in the pressing step, when air is supplied, the expansion part expands into a shape substantially complementary to the inner surface of the curved pipe part. Therefore, the pressing force of the expansion part that presses the lining material against the inner surface of the curved pipe part acts uniformly and simultaneously over the entire area. Accordingly, the occurrence of wrinkles and floating in the lining material can be prevented as much as possible.

[0026] In this case, in the inserting step, the lining jig is inserted and set such that the end of the expansion part protrudes from the end of the curved pipe part, and it is preferable to further include a pipe setting step of setting, coaxially with the curved pipe part, a short pipe formed to have the same diameter as the curved pipe part while surrounding the protruding end of the expansion part between the inserting step and the pressing step.

[0027] With this configuration, the lining jig is inserted and set so that the end of the expansion section protrudes from the end of the curved pipe section, and the short pipe is set to surround this section, thus enabling a good finish to the lining material at the end of the curved pipe section. In addition, the expansion shape of the expansion membrane can be made curved, including the end, which effectively prevents bursting of the expansion membrane due to uneven expansion. [Brief explanation of the drawing]

[0028] [Figure 1] This is a diagram of the existing drainage pipes related to the drainage pipe repair method of the embodiment. [Figure 2] This is a side view of the straight pipe lining jig according to the embodiment, with the expansion membrane removed. [Figure 3] This is a side view showing a partial cross-section of the right half of the straight pipe lining jig according to the embodiment. [Figure 4] This is a side view of the curved pipe lining jig according to the embodiment, with the expansion membrane removed. [Figure 5] This is a side view showing a partial cross-section of the right half of the curved pipe lining jig according to the embodiment. [Figure 6] This diagram illustrates the polishing process in the method for repairing drain pipes (straight pipes) according to the embodiment. [Figure 7] This diagram illustrates the installation process in the method for repairing drainage pipes (straight pipes) according to the embodiment. [Figure 8] This diagram illustrates the attachment and setting process in the method for repairing drain pipes (straight pipes) according to the embodiment. [Figure 9] This diagram illustrates the insertion step in the drain pipe (straight pipe) repair method according to the embodiment. [Figure 10] This diagram illustrates the pressing process in the method for repairing drainage pipes (straight pipes) according to the embodiment. [Figure 11] This diagram illustrates the removal process in the drain pipe (straight pipe) repair method according to the embodiment. [Figure 12] This diagram shows the insertion step in the method for repairing a drain pipe (curved pipe) according to the embodiment. [Figure 13] This figure shows the pressing process in the method for repairing drain pipes (curved pipes) according to the embodiment. [Figure 14] This diagram shows the removal process in the drain pipe (bent pipe) repair method according to the embodiment. [Modes for carrying out the invention]

[0029] The following describes a lining jig according to one embodiment of the present invention and a method for repairing drainage pipes using the same, with reference to the attached drawings. In older apartment buildings, drainage pipe repair work (replacement) is carried out, but in the case of existing drainage pipes, in the slab penetration section or concrete embedded section where chipping work is required, the sections before and after are cut and left in place, and only this section is reused. The left-in drainage pipes, whether straight or curved, are several tens of centimeters long, and are refurbished by applying a lining so that they can be reused.

[0030] The lining jig and drain pipe repair method of this embodiment are for lining the remaining drain pipes, which are several tens of centimeters long. The explanation will proceed using the repair of an existing drain riser pipe as an example. The lining jig is provided in two types: one for lining the straight pipe section (hereinafter referred to as the "straight pipe lining jig") and one for lining the curved pipe section (hereinafter referred to as the "curved pipe lining jig").

[0031] Figure 1 is a diagram of the existing drainage pipes in an apartment building. As shown in the figure, the drain riser 1 is routed through the slab S on each floor and is composed of multiple straight drain pipes 2 connected by multiple T-joints 3 (junction fittings). The lower end of the drain riser 1 is connected to the horizontal drain main pipe 5 via an elbow 4 to guide the drainage to the outside. The branch side of the T-joint 3 interposed in the drain riser 1 is connected to a drain branch pipe 6 that guides drainage from various sanitary fixtures (kitchen sinks, bathrooms, washbasins, washing machines, etc.) to the drain riser 1. Drainage from various sanitary fixtures flows from the drain branch pipe 6 to the drain riser 1, and from the drain riser 1 through the elbow 4 and the horizontal drain main pipe 5 to the outside (drain pit).

[0032] In this drain riser pipe 1, the straight pipe section 10A that penetrates the slab S on each floor and the curved pipe section 10B of the elbow 4 embedded in the concrete C are left as existing pipes, and renovation will be carried out by lining. Specifically, in the slab penetration section, the pipe is cut at a position of several tens of centimeters above and several tens of centimeters below the slab, and the straight pipe section 10A remaining in the slab S is lined. Similarly, in the concrete embedded section, the pipe is cut at a position of several tens of centimeters on both the front and back of the concrete C, and the curved pipe section 10B remaining in the concrete C is lined.

[0033] Furthermore, a straight pipe lining jig 20A is used for lining the straight pipe section 10A, and a curved pipe lining jig 20B is used for lining the curved pipe section 10B. Once the rehabilitation of the straight pipe section 10A and the curved pipe section 10B by lining is complete, the drain riser pipe 1 is refurbished by connecting the new piping (straight pipe) using a special fitting.

[0034] The lining materials 11A and 11B, which form the main part of the lining, are made by impregnating a fiber-reinforced material with resin. The lining material 11A for the straight pipe section 10A is formed in a straight cylindrical shape and has a shape complementary to the inner surface of the straight pipe section 10A. The lining material 11B for the curved pipe section 10B is formed in a curved cylindrical shape and has a shape complementary to the inner surface of the curved pipe section 10B. For the fiber-reinforced material, for example, a material made by weaving polyester fibers is used, and for the resin, for example, a two-component epoxy resin (adhesive) is used.

[0035] Furthermore, release films 12A and 12B are interposed between the lining materials 11A and 11B and the straight pipe lining jig 20A or the curved pipe lining jig 20B for the purpose of separation (details will be described later). These release films 12A and 12B are made of polyethylene, for example, molded into a cylindrical shape (straight or curved). This prevents the straight pipe lining jig 20A or the curved pipe lining jig 20B from adhering to the lining materials 11A and 11B, and allows these jigs to be easily removed after the lining materials 11A and 11B have hardened.

[0036] The following describes the repair methods for the straight section 10A and the curved section 10B of the drainpipe. Before that, however, we will explain in detail the straight pipe lining jig 20A and the curved pipe lining jig 20B used in these repair methods.

[0037] [Straight pipe lining jig] Figure 2 is a side view of the straight pipe lining jig 20A with the expansion membrane removed, and Figure 3 is a side view of the straight pipe lining jig 20A with the right half as a partial cross-section. As shown in both figures, the straight pipe lining jig 20A comprises a rigid, straight jig body 21 having an air supply port 23 at its upper end and an air chamber 24 inside, and an expansion membrane 22 that covers the outer periphery of the jig body 21 and has a gap space 25 that communicates with the air chamber 24.

[0038] The jig body 21 has a supply port 23 made of a female coupler and a main body part 31 made of polyvinyl chloride. The female coupler has a check valve (not shown) incorporated into it, and a male coupler 28 provided on the air tube 27 on the air supply source side is attached to and detached (connected) to it (see Figure 10). When the male coupler 28 is connected to the female coupler (supply port 23) to supply air, the check valve opens, and when the male coupler 28 is disconnected from the female coupler (pulled out), the check valve closes. In this embodiment, air is supplied to inflate the straight pipe lining jig 20A and wait for the lining material 11A to harden (the resin to harden), but this expansion can be maintained even if the air tube 27 (male coupler 28) is removed.

[0039] The main body section 31 is formed in a bottomed cylindrical shape by combining straight pipes and various fittings made of polyvinyl chloride pipe. An air chamber 24 connected to the supply port 23 is formed throughout the entire interior of the main body section 31. The main body section 31 has a threaded joint section 32 to which the supply port 23 is joined, an upper joint section 33 connected to the threaded joint section 32, a body section 34 connected to the upper joint section 33, and a lower joint section 35 connected to the body section 34, and the air chamber 24 is formed inside these components.

[0040] The body 34 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 section 10A. The body 34 also has multiple communication holes 36 that connect the air chamber 24 and the gap space 25. Air supplied from the supply port 23 flows into the air chamber 24, and from this air chamber 24 flows into the gap space 25 through the multiple communication holes 36. The air that flows into this gap space 25 then expands the expansion membrane 22.

[0041] The upper joint portion 33 has two annular shallow grooves 33a, one above and one below. As will be described in detail later, the lower shallow groove 33a constitutes part of the upper annular seal portion 41 of the expandable membrane 22. Similarly, the lower joint portion 35 has two annular shallow grooves 35a, one above and one below. In this case as well, the lower shallow groove 35a constitutes part of the lower annular seal portion 41 of the expandable membrane 22.

[0042] The expansion membrane 22 is made of cylindrical rubber (rubber tube). The expansion membrane 22 has two annular sealing portions 41 at both the upper and lower ends that maintain airtightness with the jig body 21, and a straight expansion portion 42 (expansion portion) between the two annular sealing portions 41 that corresponds to the length of the straight pipe portion 10A. The expansion membrane 22 also has a pair of upper and lower folded portions 43 that are folded and overlapped at each annular sealing portion 41.

[0043] The upper annular seal portion 41 is constructed by tying the upper end of the expandable membrane 22 to the shallow groove 33a of the upper joint portion 33 with a string-like body 45. Similarly, the lower annular seal portion 41 is constructed by tying the lower end of the expandable membrane 22 to the shallow groove 35a of the lower joint portion 35 with a string-like body 45. The upper and lower ends of the expandable membrane 22, which are tied with the string-like body 45, are folded back to form a pair of folded-back portions 43.

[0044] As described above, the straight expansion section 42 is the same length as the straight pipe section 10A, but specifically, the straight expansion section 42 is formed to be slightly longer than the length of the straight pipe section 10A (see Figure 10). This ensures that the cut ends of the lining material 11A are properly pressed, preventing wrinkles and air trapping (lifting) at each end. In addition, the pair of folded sections 43 suppress expansion at both outer ends of the straight expansion section 42. That is, the expanding straight expansion section 42 comes into contact with the lining material 11A from the upper and lower middle sections. As a result, any air trapped in the lining material 11A is pushed out (sent out) towards both outer ends of the straight expansion section 42, preventing lifting of the lining material 11A.

[0045] The straight section expansion portion 42 expands to a shape approximately complementary to the inner surface of the straight pipe section 10A due to the air supplied to the gap space 25. The expansion width in this case, that is, the radial expansion width of the expansion membrane 22 (straight section expansion portion 42) for attaching the lining material 11A, is approximately 10 mm (see Figure 10). As a result, when inserting the straight pipe lining jig 20A, the expansion membrane 22 does not get caught on the end of the lining material 11A, and the expansion width of the expansion membrane 22 can be kept as narrow as possible, allowing the lining material 11A to be pressed stably and uniformly.

[0046] Thus, in the straight pipe lining jig 20A, when air is supplied, the straight expansion portion 42 of the expansion membrane 22 expands to a shape approximately complementary to the inner surface of the straight pipe portion 10A, pressing the lining material 11A against the straight pipe portion 10A. Therefore, the pressing force of the straight expansion portion 42 that presses the lining material 11A against the inner surface of the straight pipe portion 10A acts uniformly and simultaneously throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material 11A of the straight pipe portion 10A can be prevented as much as possible.

[0047] [Bent pipe lining jig] Figure 4 is a side view of the curved pipe lining jig 20B with the expansion membrane removed, and Figure 5 is a side view of the curved pipe lining jig 20B with the right half as a partial cross-section. As shown in both figures, the curved pipe lining jig 20B comprises a flexible and curved jig body 51 having an air supply port 53 at one end and an air chamber 54 inside, and an expansion membrane 52 that covers the outer circumference of the jig body 51 and has a gap space 55 that communicates with the air chamber 54.

[0048] The jig body 51 has a supply port 53 made of a female coupler and a main body part 61 made of soft plastic. The female coupler has a check valve (not shown) incorporated into it, and a male coupler 58 provided on the air tube 57 on the air supply source side is attached to and detached (connected) to it (see Figure 12). When the male coupler 58 is connected to the female coupler (supply port 53) to supply air, the check valve opens, and when the male coupler 58 is disconnected from the female coupler (pulled out), the check valve closes. In this embodiment, air is supplied to inflate the curved pipe lining jig 20B and wait for the lining material 11B to harden (the resin to harden), but this expansion can be maintained even if the air tube 57 (male coupler 58) is removed.

[0049] The main body section 61 is formed in a curved, bottomed cylindrical shape by combining straight pipes and various fittings made of soft plastic tubing. An air chamber 54 connected to the supply port 53 is formed throughout the entire interior of the main body section 61. The main body section 61 has a threaded joint section 62 to which the supply port 53 is joined, a base joint section 63 connected to the threaded joint section 62, a curved body section 64 connected to the base joint section 63, and a tip joint section 65 connected to the curved body section 64, and the air chamber 54 is formed inside these components.

[0050] The curved body 64 is constructed by bending a straight pipe made of flexible tubing, and the length and curvature of the curved body 64 are adjusted (by cutting and bending) to correspond to the length and curvature of the curved pipe section 10B. In addition, the curved body 64 has a plurality of communication holes 66 that connect the air chamber 54 and the gap space 55. Air supplied from the supply port 53 flows into the air chamber 54, and from this air chamber 54 flows into the gap space 55 through the plurality of communication holes 66. The air that flows into this gap space 55 then expands the expansion membrane 52.

[0051] The original joint portion 63 has two annular shallow grooves 63a formed in it. As will be described in detail later, the lower shallow groove 63a constitutes a part of the annular seal portion 71 on one side (original side) of the expansion membrane 52. Similarly, the tip joint portion 65 has two annular shallow grooves 65a formed in it. In this case as well, the tip shallow groove 65a constitutes a part of the annular seal portion 71 on the other side (tip side) of the expansion membrane 52.

[0052] The expandable membrane 52 is made of a curved cylindrical rubber (rubber tube). The expandable membrane 52 has two annular sealing portions 71 at both ends that maintain airtightness with the jig body 51, and a curved expandable portion 72 (expandable portion) between the two annular sealing portions 71 that corresponds to the length of the curved pipe portion 10B. The expandable membrane 52 also has a pair of upper and lower folded portions 73 that are folded and overlapped at each annular sealing portion 71.

[0053] The original annular seal portion 71 is constructed by tying the end of the expandable membrane 52 to the shallow groove 63a of the original joint portion 63 with a string-like body 75. Similarly, the front annular seal portion 71 is constructed by tying the end of the expandable membrane 52 to the shallow groove 65a of the front joint portion 65 with a string-like body 75. The ends of the expandable membrane 52 tied with the string-like body 75 are then folded back to form a pair of folded-back portions 73.

[0054] As described above, the curved expansion section 72 has a length and curvature corresponding to the curved pipe section 10B, but specifically, the curved expansion section 72 is formed to be slightly longer than the length of the curved pipe section 10B (see Figure 12). This ensures that the cut ends of the lining material 11B are properly pressed, preventing wrinkles and air trapping (lifting) at each end. In addition, the pair of folded sections 73 suppress expansion at both outer ends of the curved expansion section 72. That is, the expanding curved expansion section 72 comes into contact with the lining material 11B from the axial middle section. As a result, any air trapped in the lining material 11B is pushed out (sent out) towards both outer ends of the curved expansion section 72, preventing lifting of the lining material 11B.

[0055] The curved expansion section 72 expands to a shape approximately complementary to the inner surface of the curved pipe section 10B due to the air supplied to the gap space 55. The expansion width in this case, that is, the radial expansion width of the expansion membrane 52 (curved expansion section 72) for attaching the lining material 11B, is approximately 10 mm (see Figure 12). As a result, when inserting the curved pipe lining jig 20B, the expansion membrane 52 is less likely to catch on the edge of the lining material 11B, and the expansion width of the expansion membrane 52 can be kept as narrow as possible, allowing the lining material 11B to be pressed stably and uniformly.

[0056] Thus, in the curved pipe lining jig 20B, when air is supplied, the curved expansion portion 72 of the expansion membrane 52 expands to a shape approximately complementary to the inner surface of the curved pipe portion 10B, pressing the lining material 11B against the curved pipe portion 10B. Therefore, the pressing force of the curved expansion portion 72 that presses the lining material 11B against the inner surface of the curved pipe portion 10B acts uniformly and simultaneously throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material 11B of the curved pipe portion 10B can be prevented as much as possible.

[0057] Next, with reference to Figures 6 to 11, a method for repairing drainage pipes using a straight pipe lining jig 20A will be described, and with reference to Figures 12 to 14, a method for repairing drainage pipes using a curved pipe lining jig 20B will be described. In this case, the drainage pipe consists of a straight pipe section 10A left in the slab S and a curved pipe section 10B left in the concrete C. The straight pipe lining jig 20A is used for the straight pipe section 10A, and the curved pipe lining jig 20B is used for the curved pipe section 10B.

[0058] [Method for repairing drain pipes (straight pipe sections)] As shown in Figures 6 to 11, this repair method uses a cylindrical lining material 11A to cover the straight pipe section 10A. A cylindrical release film 12A is interposed between the lining material 11A and the straight pipe lining jig 20A. In addition, a pair of short pipes 15 made of polyvinyl chloride are set on the upper and lower sides of the straight pipe section 10A so as to surround the upper and lower ends of the protruding straight section expansion portion 42.

[0059] The method for repairing the drain outlet in the straight pipe section 10A includes a polishing step (see Figure 6) to remove rust and lumps from the inner surface of the straight pipe section 10A, an attachment step (see Figure 7) to attach the lining material 11A to the inner surface of the straight pipe section 10A, an attachment and setting step (see Figure 8) to attach a release film 12A to the surface of the lining material 11A and set a pair of short pipes 15, an insertion step (see Figure 9) to insert and set the straight pipe lining jig 20A into the straight pipe section 10A, a pressing step (see Figure 10) to supply air to the straight pipe lining jig 20A to inflate the expansion film 22, a curing and curing step to harden the resin in the lining material 11A, and a removal step (see Figure 11) to remove the straight pipe lining jig 20A, release film 12A, etc. after releasing the air.

[0060] In the polishing process, an electric drill equipped with a chain-attached polishing bit 81 is used to polish the inner surface of the straight pipe section 10A to remove rust, lumps, etc. (see Figure 6). In parallel with the polishing, dust is removed by suction, etc., and the inner surface of the straight pipe section 10A is cleaned. As a result, the inner surface of the straight pipe section 10A is left bare.

[0061] 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 11A to the inner surface of the straight pipe section 10A (post-process: see Figure 7). In the pre-process, a cylindrical fiber reinforcement material is placed in a transparent polyester bag, and a two-part 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).

[0062] In the subsequent process, the lining material 11A removed from the bag is inserted into the straight pipe section 10A and attached to its inner surface. In this case, it is preferable that both ends of the lining material 11A protrude slightly from the straight pipe section 10A.

[0063] The attachment and setting process includes the step of attaching a cylindrical release film 12A to the surface of the lining material 11A (attachment process) and the step of setting short pipes 15 at both the upper and lower ends of the straight pipe section 10A (pipe setting process) (see Figure 8). In this case, each short pipe 15 is made of a polyvinyl chloride pipe piece with the same diameter (same inner diameter) as the straight pipe section 10A and is set coaxially with the straight pipe section 10A. It is preferable to set the short pipes 15 at both ends of the straight pipe section 10A in a temporary manner using vinyl tape or the like.

[0064] In the insertion process, the straight pipe lining jig 20A is inserted from above into the straight pipe section 10A, which has the lining material 11A and release film 12A set on it (see Figure 9). In this case, the straight pipe lining jig 20A is inserted through the straight pipe section 10A, that is, both ends of the straight pipe lining jig 20A (straight expansion section 42) protrude from the straight pipe section 10A. Needless to say, the short pipe 15 will be located in this protruding portion. Once insertion and setting are complete, the air tube 27 is connected to the supply port 23 of the straight pipe lining jig 20A.

[0065] In the pressing process, the main valve on the air supply source side is opened to supply air to the straight pipe lining jig 20A (see Figure 10). As a result, the expanding membrane 22 (straight section expansion part 42) expands to a shape approximately complementary to the inner surface of the straight pipe section 10A, pressing down on the lining material 11A and adhering to the inner surface of the straight pipe section 10A. In this case, the expansion of the straight section expansion part 42 is absorbed by the straight pipe section 10A and the pair of upper and lower short pipes 15 that follow it, preventing wrinkles from forming at both ends of the lining material 11A. At the same time, bursting of the straight section expansion part 42 (the part that protrudes from the straight pipe section 10A) is also prevented. Once the air supply is finished (the expanded state is maintained), the air tube 27 connected to the supply port 23 of the straight pipe lining jig 20A is removed, and the process moves on to the hardening and curing process.

[0066] In the curing and curing process, the lining material 11A 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 11A (resin) hardens in approximately 3 hours. Once the lining material 11A has hardened, the process moves on to the removal process.

[0067] In the removal process, first, the air is released from the straight pipe lining jig 20A and it is removed by pulling it out. Next, the pair of short pipes 15 are removed, and the release film 12A is removed by peeling it off (see Figure 11).

[0068] Furthermore, if burrs or other irregularities occur at both ends of the hardened lining material 11A, it is preferable to polish these areas to finish the surface and then apply resin with a brush (finishing process).

[0069] Thus, in this drain pipe repair method, when air is supplied during the pressing process, the straight section expansion part 42 expands to a shape approximately complementary to the straight pipe section 10A. Therefore, the pressing force of the straight section expansion part 42 that presses the lining material 11A against the straight pipe section 10A acts uniformly and simultaneously throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material 11A can be prevented as much as possible.

[0070] [Method for repairing drain pipes (bent sections)] As shown in Figures 12 to 14, this repair method also uses a curved cylindrical lining material 11B to cover the curved pipe section 10B, similar to the repair method described above. A curved cylindrical release film 12B is interposed between the lining material 11B and the curved pipe lining jig 20B. In addition, a pair of short polyvinyl chloride pipes 15 are set so as to surround each end of the protruding curved expansion section 72 and so as to be in contact with both ends of the curved pipe section 10B.

[0071] The method for repairing the drain outlet in the curved pipe section 10B includes a polishing step to remove rust and lumps from the inner surface of the curved pipe section 10B, an attachment step to attach the lining material 11B to the inner surface of the curved pipe section 10B, an attachment and setting step to attach a release film 12B to the surface of the lining material 11B and set a pair of short pipes 15, an insertion step to insert and set the curved pipe lining jig 20B into the curved pipe section 10B (see Figure 12), a pressing step to supply air to the curved pipe lining jig 20B to inflate the expansion film 52 (see Figure 13), a curing and curing step to harden the resin in the lining material 11B, and a removal step to remove the curved pipe lining jig 20B, release film 12B, etc. after releasing the air (see Figure 14).

[0072] In this case, the lining of the curved pipe section 10B and the lining of the straight pipe section 10A are essentially the same process. Therefore, the insertion process, pressing process, and removal process will be explained here, and the explanation of the other processes will be omitted.

[0073] In the insertion process, the curved pipe lining jig 20B is inserted from above into the curved pipe section 10B, which has the lining material 11B and release film 12B set (see Figure 12). In this insertion operation, the flexibility of the curved pipe lining jig 20B is utilized to allow the jig to bend during insertion. In this case as well, the curved pipe lining jig 20B is inserted through the curved pipe section 10B, that is, both ends of the curved pipe lining jig 20B (curved expansion section 72) protrude from the curved pipe section 10B. Needless to say, the short pipe 15 will be located in this protruding portion. Once insertion and setting are complete, the air tube 57 is connected to the supply port 53 of the curved pipe lining jig 20B.

[0074] In the pressing process, the main valve on the air supply source side is opened to supply air to the curved pipe lining jig 20B (see Figure 13). As a result, the expanding membrane 52 (curved expansion portion 72) expands to a shape approximately complementary to the inner surface of the curved pipe portion 10B, pressing down on the lining material 11B and adhering to the inner surface of the curved pipe portion 10B. In this case, the expansion of the curved expansion portion 72 is absorbed by the curved pipe portion 10B and the pair of short pipes 15 that follow it, preventing wrinkles from forming at both ends of the lining material 11B. At the same time, bursting of the curved expansion portion 72 (the portion that protrudes from the curved pipe portion 10B) is also prevented. Once the air supply is finished (the expanded state is maintained), the air tube 57 connected to the supply port 53 of the curved pipe lining jig 20B is removed, and the process moves on to the hardening and curing process.

[0075] In the removal process, first, the air is released from the curved pipe lining jig 20B and it is removed by pulling it out. Next, the pair of short pipes 15 are removed, and the release film 12B is removed by peeling it off (see Figure 14).

[0076] Thus, in this drain pipe repair method, when air is supplied during the pressing process, the curved expansion section 72 expands to a shape approximately complementary to the curved pipe section 10B. Therefore, the pressing force of the curved expansion section 72 that presses the lining material 11B against the curved pipe section 10B acts uniformly and simultaneously throughout the entire area. Consequently, the occurrence of wrinkles and lifting in the lining material 11B can be prevented as much as possible. [Explanation of Symbols]

[0077] 10A...Straight pipe section, 10B...Bent pipe section, 11A...Lining material, 11B...Lining material, 12A...Release film, 12B...Release film, 15...Short pipe, 20A...Bent pipe lining jig, 20B...Bent pipe lining jig, 21...Jig body, 22...Expansion film, 23...Supply port, 24...Air chamber, 25...Gap space, 31...Main body part, 33a...Shallow groove, 35a...Shallow groove, 41...Annular seal section, 42...Straight pipe expansion section, 43...Folded pipe, 45...String-like body, 51...Jig body, 52...Expansion membrane, 53...Supply port, 54...Air chamber, 55...Gap space, 61...Main body part, 63a...Shallow groove, 65a...Shallow groove, 71...Annular seal section, 72...Bent pipe expansion section, 73...Folded pipe, 75...String-like body, C...Concrete, S...Slab,

Claims

1. A lining jig for attaching a lining material, which is a fiber-reinforced material impregnated with resin, to the inner surface of a straight pipe section of a pipe, A rigid, straight-shaped jig body having an air supply port at one end and an air chamber connected to the supply port inside, The device comprises an expandable membrane that covers the outer periphery of the jig body, leaving a gap space in communication with the air chamber, and expands to conform to the inner surface of the straight pipe portion by air supplied from the supply port via the air chamber, The expansion membrane has two annular sealing portions at both ends that maintain airtightness with the jig body, and an expansion portion between the two annular sealing portions that has a length corresponding to the straight pipe portion. The supply port is composed of a female coupler with a check valve. The lining jig is characterized in that the check valve opens when the male coupler on the air supply source side is connected to the female coupler and closes when the connection is released.

2. A lining jig for attaching a lining material, which is a fiber-reinforced material impregnated with resin, to the inner surface of a curved pipe section, A flexible and curved jig body having an air supply port at one end and an air chamber connected to the supply port inside, The device comprises an expandable membrane that covers the outer periphery of the jig body, leaving a gap space in communication with the air chamber, and expands to conform to the inner surface of the curved pipe portion by air supplied from the supply port via the air chamber, The expansion membrane has two annular sealing portions at both ends that maintain airtightness with the jig body, and an expansion portion between the two annular sealing portions that has a length corresponding to the curved pipe portion. The supply port is composed of a female coupler with a check valve. The lining jig is characterized in that the check valve opens when the male coupler on the air supply source side is connected to the female coupler and closes when the connection is released.

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

4. The lining jig according to claim 1 or 2, characterized in that each of the annular sealing portions is configured by tying the end of the expanding membrane to the outer circumference of the jig body with a string-like body.

5. The lining jig according to claim 4, characterized in that an annular shallow groove is formed on the outer circumference of the jig body corresponding to the position where the string-like body is tied.

6. The lining jig according to claim 4, characterized in that the expanded membrane has a pair of folded portions that are folded and overlapped at each of the annular sealing portions.

7. A method for repairing a drain pipe, comprising using the lining jig described in claim 1 to line the straight section of an existing drain pipe, An attachment step of attaching the lining material to the inner surface of the straight pipe portion, The process involves attaching a release film for peeling to the surface of the lining material, An insertion step of inserting and setting the lining jig into the straight pipe portion, A pressing step is to supply air to the lining jig and press the lining material with the expanding membrane to adhere it to the inner surface of the straight pipe section, A curing process for hardening the resin in the lining material, A method for repairing a drain pipe, characterized by comprising a removal step of removing the lining jig and the release film from the straight pipe section after releasing the air.

8. A method for repairing a drain pipe, comprising applying a lining material, which is a fiber-reinforced material impregnated with resin, to the inner surface of the straight section of the pipe using a lining jig, wherein the lining material is applied to the straight section of an existing drain pipe, The lining jig is, A rigid, straight-shaped jig body having an air supply port at one end and an air chamber connected to the supply port inside, The device comprises an expandable membrane that covers the outer periphery of the jig body, leaving a gap space in communication with the air chamber, and expands to conform to the inner surface of the straight pipe portion by air supplied from the supply port via the air chamber, The expansion membrane has two annular sealing portions at both ends that maintain airtightness with the jig body, and an expansion portion between the two annular sealing portions that has a length corresponding to the straight pipe portion. An attachment step of attaching the lining material to the inner surface of the straight pipe portion, The process involves attaching a release film for peeling to the surface of the lining material, The insertion step involves inserting and setting the lining jig into the straight pipe portion such that the end of the expansion portion protrudes from the end of the straight pipe portion, After the insertion step, a pipe setting step is performed in which a short pipe, which surrounds the end of the protruding expansion portion and is formed to the same diameter as the straight pipe portion, is set coaxially with the straight pipe portion. After the pipe setting step, an air supply is made to the lining jig, and the lining material is pressed down by the expanding membrane to adhere to the inner surface of the straight pipe section in a pressing step, A curing process for hardening the resin in the lining material, A method for repairing a drain pipe, characterized by comprising a removal step of removing the lining jig and the release film from the straight pipe section after releasing the air.

9. A method for repairing a drain pipe, comprising using the lining jig described in claim 2 to line the curved portion of an existing drain pipe, An attachment step of attaching the lining material to the inner surface of the curved pipe portion, The process involves attaching a release film for peeling to the surface of the lining material, An insertion step of inserting and setting the lining jig into the curved pipe portion, A pressing step is to supply air to the lining jig and press the lining material with the expanding membrane to adhere it to the inner surface of the curved pipe portion, A curing process for hardening the resin in the lining material, A method for repairing a drain pipe, characterized by comprising a removal step of removing the lining jig and the release film from the curved pipe portion after releasing the air.

10. A method for repairing a drain pipe, wherein a lining material, which is a fiber-reinforced material impregnated with resin, is attached to the inner surface of the curved portion of the pipe using a lining jig, and the lining is applied to the curved portion of an existing drain pipe, The lining jig is, A flexible and curved jig body having an air supply port at one end and an air chamber connected to the supply port inside, The device comprises an expandable membrane that covers the outer periphery of the jig body, leaving a gap space in communication with the air chamber, and expands to conform to the inner surface of the curved pipe portion by air supplied from the supply port via the air chamber, The expansion membrane has two annular sealing portions at both ends that maintain airtightness with the jig body, and an expansion portion between the two annular sealing portions that has a length corresponding to the curved pipe portion. An attachment step of attaching the lining material to the inner surface of the curved pipe portion, The process involves attaching a release film for peeling to the surface of the lining material, The insertion step involves inserting and setting the lining jig into the curved pipe portion, with the end of the expansion portion protruding from the end of the curved pipe portion. After the insertion step, a pipe setting step is performed in which a short pipe, which surrounds the end of the protruding expansion portion and is formed to the same diameter as the curved pipe portion, is set coaxially with the curved pipe portion. After the pipe setting step, an air supply is made to the lining jig, and the lining material is pressed down by the expanding membrane to adhere to the inner surface of the curved pipe portion in a pressing step, A curing process for hardening the resin in the lining material, A method for repairing a drain pipe, characterized by comprising a removal step of removing the lining jig and the release film from the curved pipe portion after releasing the air.

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