Lining jig and drainage pipe repair method 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 tool for lining straight pipe sections and bent pipe sections of existing piping, and a method for repairing drainage pipes using the same. [Background technology]

[0002] Conventionally, as this type of lining jig and drain pipe repair method, a pressurized tube and drain pipe production method for lining existing piping around a trap (bowl trap) or around a drainage standpipe are known (see Patent Document 1). In this case, a straight pipe section pressing tube is provided that lines the inner circumferential surface of the trap inner cylinder and the vertical pipe connected thereto with a reinforcing material made of resin-impregnated cloth, and a curved pipe section pressing tube is provided that lines the joint between the drainage vertical pipe and the drainage branch pipe with a reinforcing material. The straight tube pressing tube includes a polyvinyl chloride support member having a gas flow path therein, a synthetic rubber expansion member body having both ends airtightly welded to both ends of the support member and forming an enclosed space for gas inside, and a heater disposed in the enclosed space. A gas supply pipe connected to a gas supply source is attached to one end of the support member. A gas supply hole that connects the gas flow path to the enclosed space of the expansion member body is formed in the main body of the support member that serves as the gas supply section. This pressing tube is inflated into a rugby ball shape by supplying a gas such as air into the enclosed space through the support member. When lining the straight pipe section around the trap, first a reinforcing member made of resin-impregnated cloth is attached to this straight pipe section, and a polyethylene thin film is attached to it. Next, a pressure tube is inserted into this section, and after positioning, gas is supplied. When gas is supplied, the expansion member body expands, sandwiching the thin film against the straight pipe section and pressing the reinforcing member radially outward. Then, while maintaining this pressing state, the heater is turned on to harden the resin. On the other hand, the pressure tube for the curved pipe section includes an expansion member formed into a bag shape using rubber or the like, a fixed cap that fixes (closes) the upper end of the expansion member to form a sealed space, a gas supply tube that penetrates the fixed cap and has a gas supply hole for supplying gas into the sealed space, and a heater disposed in the sealed space. This pressure tube expands into a tapered bag shape by supplying gas into the sealed space via the gas supply tube. When lining a curved pipe section around a drainage standpipe, first a reinforcing member made of resin-impregnated cloth is attached to the curved pipe section, and a polyethylene thin film is attached to the curved pipe section. Next, a pressure tube is inserted into the section, and after positioning, gas is supplied. When gas is supplied, the expansion member expands and presses the reinforcing member radially outward against the curved pipe section, sandwiching the thin film. Then, while maintaining this pressing state, the heater is turned on to harden the resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3797989 Summary of the Invention [Problem to be solved by the invention]

[0004] In such conventional lining technology, in the case of a pressure tube for a straight pipe section, the expanding pressure tube presses the reinforcing member (lining material) and the thin film against the straight-shaped inner circumferential surface. In this case, the inner circumferential surface of the straight pipe section is cylindrical, whereas the pressure tube expands into a rugby ball shape. Therefore, during the expansion process of the pressure tube, that is, from when the pressure tube comes into contact with the inner circumferential surface of the straight pipe section until it presses it, the contact portion may move or the pressing may become uneven. As a result, there is a risk that the reinforcing member (lining material) may wrinkle or float, or the pressure tube may burst. Similarly, with the compression tube for the curved pipe section, the inner surface shape of the straight pipe section is different from the external shape of the compression tube when expanded, which could cause wrinkles or lifting in the reinforcing member (lining material) or the compression tube to burst. If wrinkles or lifting occurs in the reinforcing member (lining material), an obstacle that disrupts the flow will be created on the inner surface of the drainage pipe, which has been narrowed by the lining material, and this will cause the drainage to clog.

[0005] An object of the present invention is to provide a lining tool that can prevent wrinkles and floating in the lining material as much as possible, and a method for repairing a drainage pipe using the same. [Means for solving the problem]

[0006] The lining jig of the present invention is a lining jig that attaches a lining material, which is made of fiber reinforced material impregnated with resin, to the inner surface of a straight pipe section of a pipe, and is equipped with a hard, straight-shaped jig body having an air supply port at one end and an air chamber inside that is connected to the supply port, and an expandable membrane body that covers the outer periphery of the jig body with a gap space that communicates with the air chamber and expands to a shape approximately complementary to the inner surface of the straight pipe section by air supplied from the supply port through the air chamber, and is characterized in that the expandable membrane body has two annular seal portions at both ends that maintain airtightness between it and the jig body, and an expansion portion of a length corresponding to the straight pipe section formed between the two annular seal portions.

[0007] According to this configuration, when air is supplied from the supply port, the air flows through the air chamber into the gap space between the jig body and the inflatable membrane body, causing the inflatable portion of the inflatable membrane body to inflate. The inflatable portion inflates into a shape that is approximately complementary to the inner surface of the straight pipe portion, pressing the lining material against the inner surface of the straight pipe portion. In this case, since the inflatable portion inflates into a shape that is approximately complementary to the inner surface of the straight pipe portion, the pressing force of the inflatable portion pressing the lining material against the inner surface of the straight pipe portion acts uniformly and simultaneously over the entire area. This makes it possible to prevent wrinkles and lifting in the lining material as much as possible.

[0008] Another lining jig of the present invention is a lining jig for attaching a lining material, which is made of fiber reinforced material impregnated with resin, to the inner surface of a curved pipe portion of a piping, and is characterized in that it comprises a flexible, curved jig body having an air supply port at one end and an air chamber inside which is connected to the supply port, and an expandable membrane body which covers the outer periphery of the jig body with a gap space communicating with the air chamber and expands to a shape approximately complementary to the inner surface of the curved pipe portion by air supplied from the supply port through the air chamber, and has two annular seal portions at both ends that maintain airtightness between the jig body and the expandable membrane body, and an expansion portion of a length corresponding to the curved pipe portion formed between the two annular seal portions.

[0009] According to this configuration, when air is supplied from the supply port, the air flows through the air chamber into the gap space between the jig body and the inflatable membrane body, inflating the inflatable portion of the inflatable membrane body. The inflatable portion expands into a shape that is approximately complementary to the inner surface of the curved pipe portion, and presses the lining material against the inner surface of the curved pipe portion. In this case, since the inflatable portion expands into a shape that is approximately complementary to the inner surface of the curved pipe portion, the pressing force of the inflatable portion that presses the lining material against the inner surface of the curved pipe portion acts uniformly and simultaneously over the entire area. Therefore, it is possible to prevent wrinkles and lifting in the lining material as much as possible.

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

[0011] According to this configuration, when inserting the lining jig into the straight pipe section or the curved pipe section where the lining material is manually applied, the inflatable membrane body does not get caught on the edge of the lining material, and the inflatable membrane body can be expanded as narrow as possible. This allows the lining material to be pressed stably and uniformly without impairing workability.

[0012] It is also preferable that each annular seal portion is configured by tying an end of an inflatable membrane body to the outer periphery of the jig body with a string-like body.

[0013] With this configuration, by simply tying a portion of the expandable membrane body to the outer periphery of the jig body, it is possible to form sealed portions at both ends of the expansion section; in other words, it is possible to easily form an expandable membrane body that expands to the desired shape, and the lining jig can be easily manufactured at low cost.

[0014] In this case, it is preferable that an annular shallow groove is formed on the outer periphery of the jig body in correspondence with the position where the string-like body is to be tied.

[0015] According to this configuration, the position where the string-like body is to be tied can be clearly defined, and the tying work can be performed efficiently. Also, the sealing performance by tying can be improved.

[0016] The inflatable membrane preferably has a pair of folded portions that are folded back and overlapped at each annular seal portion.

[0017] According to this configuration, the pair of folded parts overlap with both outer ends of the expanding part, so that the expansion of both outer ends is suppressed. Therefore, the expanding expanding part contacts and presses the inner surfaces of the straight pipe part and the curved pipe part from the middle part in the extension direction. As a result, the air trapped in the lining material is pushed (sent out) toward both outer ends of the expanding part, effectively preventing the lining material from floating.

[0018] On the other hand, the supply port is preferably configured with a female coupler equipped with a check valve, which opens when a male coupler on the air supply source side is connected to the female coupler and closes when the connection is released.

[0019] With this configuration, when the inflatable membrane is inflated by supplying air to press down on the lining material, the check valve functions to maintain the air supply state when the male coupler on the air supply source side is disconnected from the female coupler of the jig body. In other words, even if the male coupler is disconnected, the lining material is automatically maintained in a pressed state, and it is possible to transition to a state where the resin is waiting to harden. This allows the lining work to be carried out efficiently and smoothly when the lining work is carried out in multiple locations.

[0020] The drainage pipe renovation method of the present invention is a drainage pipe renovation method for lining a straight pipe section of an existing drainage pipe using the lining jig of claim 1, and is characterized by comprising the following steps: an attachment step of attaching a lining material to the inner surface of the straight pipe section; an attachment step of 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 section; a pressing step of supplying air to the lining jig and pressing the lining material with the expandable film body to adhere it to the inner surface of the straight pipe section; a hardening and curing step of hardening the resin in the lining material; and a removal step of removing the lining jig and the release film from the straight pipe section after removing the air.

[0021] According to this configuration, when air is supplied in the pressing process, the expanding portion expands to a shape that is approximately complementary to the inner surface of the straight pipe portion. Therefore, the pressing force of the expanding portion pressing the lining material against the inner surface of the straight pipe portion acts uniformly and simultaneously over the entire area. This makes it possible to prevent wrinkles and lifting in the lining material as much as possible.

[0022] In this case, in the insertion step, the lining jig is inserted and set so that the end of the expanded portion protrudes from the end of the straight pipe portion, and between the insertion step and the pressing step, it is preferable that the method further includes a pipe setting step in which a short pipe that surrounds the protruding end of the expanded portion and is formed to the same diameter as the straight pipe portion is set coaxially with the straight pipe portion.

[0023] According to this configuration, the lining jig is inserted and set so that the end of the expansion part protrudes from the end of the straight pipe part, and the short pipe is set to surround this part, so that the lining material at the end of the straight pipe part can be finished in a good condition. Also, the expansion form of the expandable membrane body can be made straight, including the end, and bursting of the expandable membrane body due to uneven expansion can be effectively prevented.

[0024] Another drainage pipe renovation method of the present invention is a drainage pipe renovation method for lining a curved section of an existing drainage pipe using the lining jig of claim 2, and is characterized by comprising the following steps: an attachment step of attaching a lining material to the inner surface of the curved section; an attachment step of 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 section; a pressing step of supplying air to the lining jig and pressing the lining material with the expandable film to adhere it to the inner surface of the curved section; a hardening and curing step of hardening the resin in the lining material; and a removal step of removing the lining jig and the release film from the curved section after releasing the air.

[0025] According to this configuration, when air is supplied in the pressing step, the expanding portion expands to a shape that is approximately complementary to the inner surface of the curved pipe portion. Therefore, the pressing force of the expanding portion pressing the lining material against the inner surface of the curved pipe portion acts uniformly and simultaneously over the entire area. This makes it possible to prevent wrinkles and lifting in the lining material as much as possible.

[0026] In this case, in the insertion step, the lining jig is inserted and set so that the end of the expanded portion protrudes from the end of the curved pipe portion, and between the insertion step and the pressing step, it is preferable that the lining jig further includes a pipe setting step in which a short pipe that surrounds the protruding end of the expanded portion and is formed to the same diameter as the curved pipe portion is set coaxially with the curved pipe portion.

[0027] According to this configuration, the lining jig is inserted and set so that the end of the expansion part protrudes from the end of the curved pipe, and the short pipe is set to surround this part, so that the lining material at the end of the curved pipe can be finished in a good condition. Also, the expansion form of the inflatable membrane body can be curved, including the end, and bursting of the inflatable membrane body due to uneven expansion can be effectively prevented. [Brief description of the drawings]

[0028] [Figure 1] 1 is a system diagram of an existing drainage pipe relating to a drainage pipe renovation method of an embodiment. FIG. [Diagram 2] FIG. 2 is a side view of the straight pipe lining jig according to the embodiment with the inflatable membrane body removed. [Diagram 3] FIG. 2 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] 1 is a side view of a curved pipe lining jig according to an embodiment with an inflatable membrane body removed. FIG. [Diagram 5] FIG. 2 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] 1 is a diagram showing a polishing process in a method for repairing a drainage pipe (straight pipe) according to an embodiment. FIG. [Figure 7] FIG. 2 is a diagram showing an attachment process in a method for renovating a drainage pipe (straight pipe) according to an embodiment. [Figure 8] 1 is a diagram showing a pasting and setting process in a drainage pipe (straight pipe) repair method according to an embodiment of the present invention. [Figure 9] 1 is a diagram showing an insertion process in a method for repairing a drainage pipe (straight pipe) according to an embodiment. [Figure 10] 1 is a diagram showing a pressing process in a method for repairing a drainage pipe (straight pipe) according to an embodiment. FIG. [Figure 11] 1 is a diagram showing a removal process in a drainage pipe (straight pipe) repair method according to an embodiment. FIG. [Figure 12] 1 is a diagram showing an insertion process in a method for repairing a drainage pipe (curved pipe) according to an embodiment. [Figure 13] 1 is a diagram showing a pressing process in a method for repairing a drainage pipe (bent pipe) according to an embodiment. FIG. [Figure 14] 1 is a diagram showing a removal process in a drainage pipe (bent pipe) repair method according to an embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, a lining tool according to one embodiment of the present invention and a method for repairing a drainage pipe using the same will be described with reference to the attached drawings. In old apartment buildings, repair work (replacement) of drainage pipes is carried out, but in existing drainage pipes, in the slab penetration part or concrete embedded part that requires chipping work, the front and rear parts are cut off and left, and only this part is reused. The remaining drainage pipe, whether straight or curved, will be several tens of centimeters long, and will be rehabilitated by applying lining so that it can be reused.

[0030] The lining tool and drainage pipe repair method of this embodiment are for lining the remaining drainage pipe of several tens of centimeters. The explanation will be given using the repair of an existing drainage standpipe as an example, and there are two types of lining tools available: one for lining straight pipe sections (hereinafter referred to as "straight pipe lining tool") and one for lining curved pipe sections (hereinafter referred to as "curved pipe lining tool").

[0031] FIG. 1 is a system diagram of existing drainage pipes in an apartment building. As shown in the figure, a drainage standpipe 1 is installed through the slab S of each floor, and is composed of multiple drainage straight pipes 2 connected with multiple T-shaped pipes 3 (junction joints). The lower end of the drainage standpipe 1 is connected to a horizontal main drainpipe 5 that leads the drainage to the outdoors via an elbow 4. The branch side of the T-shaped pipe 3 interposed in the drainage standpipe 1 is connected to a drainage branch pipe 6 that leads the drainage from various sanitary fixtures (kitchen sink, bathtub, washbasin, washing machine, etc.) to the drainage standpipe 1. The drainage from the various sanitary fixtures flows into the drainage standpipe 1 via the drainage branch pipe 6, and is drained from the drainage standpipe 1 through the elbow 4 and the horizontal main drainpipe 5 to the outdoors (drainage manhole).

[0032] In this drainage stack 1, the straight pipe section 10A that penetrates the slab S of each floor and the curved pipe section 10B of the elbow 4 embedded in the concrete C are left as remaining pipes, and renovation is carried out by lining. Specifically, in the slab penetration section, the pipe is cut at a position about 10 centimeters above the slab and a position about 10 centimeters below the slab, and the straight pipe section 10A of several tens of centimeters left in the slab S is lined. Similarly, in the concrete embedded section, the pipe is cut at a position about 10 centimeters before and after the edge of the concrete C, and the curved pipe section 10B of several tens of centimeters left in the concrete C is lined.

[0033] 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. After the rehabilitation of the straight pipe section 10A and the curved pipe section 10B by lining is completed, the drainage stack pipe 1 is repaired by connecting a new pipe (straight pipe) using a special joint.

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

[0035] In addition, release film bodies 12A, 12B for peeling are interposed between the lining materials 11A, 11B and the straight pipe lining jig 20A or the curved pipe lining jig 20B (details will be described later), and for example, polyethylene molded into a cylindrical shape (straight or curved) is used for these release film bodies 12A, 12B. This prevents the straight pipe lining jig 20A or the curved pipe lining jig 20B from being adhered to the lining materials 11A, 11B, and makes it possible to easily remove these jigs after the lining materials 11A, 11B have hardened.

[0036] Below, we will explain the methods for renovating drainage pipes, namely, the method for renovating straight pipe section 10A and the method for renovating curved pipe section 10B. Before that, we will explain the straight pipe lining jig 20A and the curved pipe lining jig 20B used in these renovation methods in order.

[0037] [Straight pipe lining jig] FIG. 2 is a side view of the straight pipe lining jig 20A with the inflatable membrane removed, and FIG. 3 is a side view of the straight pipe lining jig 20A with the right half part partially cross-sectional. As shown in both figures, the straight pipe lining jig 20A comprises a hard, straight-shaped jig body 21 having an air supply port 23 at the upper end and an air chamber 24 formed inside, and an expandable membrane body 22 covering the outer periphery of the jig body 21 and having a gap space 25 communicating with the air chamber 24.

[0038] The jig body 21 has a supply port 23 formed of a female coupler and a main body part 31 made of polyvinyl chloride. A check valve (not shown) is built into the female coupler, and a male coupler 28 provided on an air tube 27 on the air supply source side is detachably attached (connected) (see FIG. 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 (pulled out) from the female coupler, the check valve closes. In this embodiment, air is supplied to expand the straight pipe lining jig 20A and the lining material 11A is left to harden (resin hardens), but this expansion can be maintained even if the air tube 27 (male coupler 28) is removed.

[0039] The main body part 31 is formed into a cylindrical shape with a bottom by combining a straight polyvinyl chloride pipe and various joints. An air chamber 24 connected to the supply port 23 is formed throughout the entire interior of the main body part 31. The main body part 31 has a screw joint 32 to which the supply port 23 is joined, an upper joint 33 connected to the screw joint 32, a body part 34 connected to the upper joint 33, and a lower joint 35 connected to the body part 34, and the air chamber 24 is formed inside these members.

[0040] The body 34 is made of a straight polyvinyl chloride pipe material, and the length of the body 34 is adjusted (cut and adjusted) to correspond to the length of the straight pipe portion 10A. The body 34 is also formed with a plurality of communication holes 36 that communicate the air chamber 24 with the above-mentioned 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 via the plurality of communication holes 36. The air that has flowed into this gap space 25 causes the inflatable membrane body 22 to inflate.

[0041] The upper joint 33 has two annular shallow grooves 33a formed at the top and bottom. The lower shallow groove 33a constitutes a part of the upper annular seal portion 41 of the inflatable membrane body 22, as will be described in detail later. Similarly, the lower joint 35 has two annular shallow grooves 35a formed at the top and bottom. In this case as well, the lower shallow groove 35a constitutes a part of the lower annular seal portion 41 of the inflatable membrane body 22.

[0042] The inflatable membrane body 22 is formed of cylindrical rubber (rubber tube). The inflatable membrane body 22 has two annular seal parts 41 at the upper and lower ends that maintain airtightness between the jig body 21 and the inflatable membrane body 22, and a straight inflatable part 42 (inflatable part) having a length corresponding to the straight pipe part 10A formed between the two annular seal parts 41. The inflatable membrane body 22 also has a pair of upper and lower folded parts 43 that are folded back and overlapped at the part of each annular seal part 41.

[0043] The upper annular seal portion 41 is configured by tying the upper end portion of the inflatable membrane body 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 configured by tying the lower end portion of the inflatable membrane body 22 to the shallow groove 35a of the lower joint portion 35 with a string-like body 45. The upper and lower end portions of the inflatable membrane body 22 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 expanded portion 42 has a length corresponding to the straight pipe portion 10A, but specifically, the straight expanded portion 42 is formed slightly longer than the length of the straight pipe portion 10A (see FIG. 10). This allows the cut end of the lining material 11A to be appropriately pressed, preventing wrinkles and air trapping (floating) at each end. In addition, the pair of folded-back portions 43 suppresses expansion at both outer ends of the straight expanded portion 42. That is, the expanding straight expanded portion 42 comes into contact with the lining material 11A from the upper and lower middle portions. Therefore, the air trapped in the lining material 11A is pushed out (sent out) toward both outer ends of the straight expanded portion 42, preventing the lining material 11A from floating.

[0045] The straight section expansion portion 42 expands into a shape approximately complementary to the inner surface of the straight pipe portion 10A by air supplied to the gap space 25. In this case, the expansion width, i.e., the radial expansion width of the expansion membrane body 22 (straight section expansion portion 42) for attaching the lining material 11A, is about 10 mm (see FIG. 10). This prevents problems such as the expansion membrane body 22 getting caught on the end of the lining material 11A when inserting the straight pipe lining jig 20A, and makes it possible to narrow the expansion width of the expansion membrane body 22 as much as possible, thereby enabling the lining material 11A to be pressed stably and uniformly.

[0046] In this way, when air is supplied to the straight pipe lining jig 20A, the straight expansion portion 42 of the expandable membrane body 22 expands into a shape that is approximately complementary to the inner surface of the straight pipe section 10A, pressing the lining material 11A against the straight pipe section 10A. Therefore, the pressing force of the straight expansion portion 42 pressing the lining material 11A against the inner surface of the straight pipe section 10A acts uniformly and simultaneously over the entire area. This makes it possible to prevent wrinkles and lifting of the lining material 11A of the straight pipe section 10A as much as possible.

[0047] [Bent pipe lining jig] FIG. 4 is a side view of the curved pipe lining jig 20B with the inflatable membrane removed, and FIG. 5 is a side view of the curved pipe lining jig 20B with the right half thereof partially cut away. As shown in both figures, the curved pipe lining jig 20B comprises a flexible, curved jig body 51 having an air supply port 53 at one end and an air chamber 54 formed inside, and an expandable membrane body 52 covering the outer periphery of the jig body 51 and having a gap space 55 communicating with the air chamber 54.

[0048] The jig body 51 has a supply port 53 formed by a female coupler and a main body part 61 made of soft plastic. A check valve (not shown) is built into the female coupler, and a male coupler 58 provided on an air tube 57 on the air supply source side is detachably attached (connected) (see FIG. 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 (pulled out) from the female coupler, the check valve closes. In this embodiment, air is supplied to expand the curved pipe lining jig 20B and the lining material 11B is left to harden (resin hardens), but this expansion can be maintained even if the air tube 57 (male coupler 58) is removed.

[0049] The main body part 61 is formed into a curved, bottomed cylinder by combining a straight pipe of soft plastic tubing material and various joints. An air chamber 54 connected to the supply port 53 is formed throughout the entire interior of the main body part 61. The main body part 61 has a screw joint 62 to which the supply port 53 is joined, an original joint 63 connected to the screw joint 62, a curved body part 64 connected to the original joint 63, and a tip joint 65 connected to the curved body part 64, and the air chamber 54 is formed inside these members.

[0050] The curved body portion 64 is formed by bending a straight pipe of flexible tubing, and the length and curvature of the curved body portion 64 are adjusted (by cutting and bending) to correspond to the length and curvature of the curved pipe portion 10B. The curved body portion 64 is also formed with a plurality of communication holes 66 that communicate the air chamber 54 with the above-mentioned 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 via the plurality of communication holes 66. The air that flows into this gap space 55 causes the inflatable membrane body 52 to inflate.

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

[0052] The inflatable membrane body 52 is formed of curved cylindrical rubber (rubber tube). The inflatable membrane body 52 has two annular seal parts 71 at both ends thereof that maintain airtightness between the jig body 51 and the body, and a curved expansion part 72 (expansion part) having a length corresponding to the curved pipe part 10B formed between the two annular seal parts 71. The inflatable membrane body 52 also has a pair of upper and lower folded parts 73 that are folded back and overlapped at the part of each annular seal part 71.

[0053] The base-side annular seal portion 71 is configured by tying an end of the inflatable membrane body 52 to the shallow groove 63a of the base joint portion 63 with a string-like body 75. Similarly, the tip-side annular seal portion 71 is configured by tying an end of the inflatable membrane body 52 to the shallow groove 65a of the tip joint portion 65 with a string-like body 75. Then, both ends of the inflatable membrane body 52 tied with the string-like body 75 are folded back to form a pair of folded back portions 73.

[0054] As described above, the curved portion 72 has a length and curvature corresponding to the curved pipe portion 10B, but specifically, the curved portion 72 is formed slightly longer than the length of the curved pipe portion 10B (see FIG. 12). This allows the cut ends of the lining material 11B to be appropriately pressed, preventing wrinkles and air trapping (floating) at each end. In addition, the pair of folded-back portions 73 suppresses the expansion of both outer ends of the curved portion 72. That is, the expanding curved portion 72 comes into contact with the lining material 11B from the axial middle portion. Therefore, the air trapped in the lining material 11B is pushed out (sent out) toward both outer ends of the curved portion 72, preventing the lining material 11B from floating.

[0055] The curved section expansion portion 72 expands into a shape approximately complementary to the inner surface of the curved pipe portion 10B by air supplied to the clearance space 55. In this case, the expansion width, i.e., the radial expansion width of the expansion membrane body 52 (curved section expansion portion 72) for attaching the lining material 11B, is approximately 10 mm (see FIG. 12). This makes it difficult for the expansion membrane body 52 to get caught on the edge of the lining material 11B when inserting the curved pipe lining jig 20B, and also makes it possible to narrow the expansion width of the expansion membrane body 52 as much as possible, thereby enabling the lining material 11B to be pressed stably and uniformly.

[0056] In this way, when air is supplied to the curved pipe lining jig 20B, the curved portion expansion portion 72 of the inflatable membrane body 52 expands into a shape that is approximately complementary to the inner surface of the curved pipe portion 10B, pressing the lining material 11B against the curved pipe portion 10B. As a result, the pressing force of the curved portion expansion portion 72 pressing the lining material 11B against the inner surface of the curved pipe portion 10B acts uniformly and simultaneously over the entire area. This makes it possible to prevent wrinkles and lifting in the lining material 11B of the curved pipe portion 10B as much as possible.

[0057] Next, a method for repairing a drainage pipe using a straight pipe lining jig 20A will be described with reference to Figures 6 to 11, and a method for repairing a drainage pipe using a curved pipe lining jig 20B will be described with reference to Figures 12 to 14. The drainage pipe in this case is a straight pipe section 10A left on the slab S and a curved pipe section 10B left on the concrete C, and 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] [How to repair drainage pipes (straight pipe sections)] As shown in Figures 6 to 11, in this repair method, a cylindrical lining material 11A is used 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 expanded section 42.

[0059] The method for renovating a drain outlet in a straight pipe section 10A includes a polishing process (see FIG. 6) for removing rust and bumps on the inner surface of the straight pipe section 10A, an attachment process (see FIG. 7) for attaching a lining material 11A to the inner surface of the straight pipe section 10A, an attachment and setting process (see FIG. 8) for attaching a release film 12A to the surface of the lining material 11A and setting a pair of short pipes 15, an insertion process (see FIG. 9) for inserting and setting a straight pipe lining jig 20A into the straight pipe section 10A, a pressing process (see FIG. 10) for supplying air to the straight pipe lining jig 20A to expand the expandable film 22, a hardening and curing process for hardening the resin in the lining material 11A, and a removal process (see FIG. 11) for removing the straight pipe lining jig 20A, the release film 12A, etc. after removing the air.

[0060] In the grinding process, an electric drill equipped with a grinding bit 81 attached to a chain is used to grind the straight pipe section 10A to remove rust, bumps, etc. from the inner surface (see FIG. 6). In parallel with the grinding, dust is removed by suction or the like, and the inner surface of the straight pipe section 10A is cleaned. As a result, the bare surface of the inner surface of the straight pipe section 10A is exposed.

[0061] The attachment process includes a process of impregnating the fiber reinforcement with resin in advance (pre-process) and a process of manually attaching the lining material 11A, which is the fiber reinforcement impregnated with resin, to the inner surface of the straight pipe section 10A (post-process: see Fig. 7). In the pre-process, a cylindrical fiber reinforcement is placed in a transparent polyester bag, and a two-part resin mixture is poured into the fiber reinforcement. Next, a hand roller is used to squeeze the fiber reinforcement from above the bag, so that the fiber reinforcement is uniformly impregnated with the resin (at the same time, air bubbles are removed).

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

[0063] The pasting and setting process includes a process of pasting a cylindrical release film 12A on the surface of the lining material 11A (pasting process) and a process of setting short pipes 15 at both the top and bottom ends of the straight pipe section 10A (pipe setting process) (see FIG. 8). In this case, each short pipe 15 is made of a polyvinyl chloride pipe piece having 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 on which the lining material 11A and the release film 12A are set (see FIG. 9). In this case, the straight pipe lining jig 20A is inserted into the straight pipe section 10A, that is, set so that both ends of the straight pipe lining jig 20A (straight expanded 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, an 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 FIG. 10). As a result, the inflatable membrane body 22 (straight section inflatable portion 42) inflates to a shape that is approximately complementary to the inner surface of the straight pipe portion 10A, and presses the lining material 11A to adhere to the inner surface of the straight pipe portion 10A. In this case, the expansion of the straight section inflatable portion 42 is received by the straight pipe portion 10A and the pair of short pipes 15 on the upper and lower sides thereof, so that wrinkles and the like do not occur at both ends of the lining material 11A. In addition, the burst of the straight section inflatable portion 42 (portion protruding from the straight pipe portion 10A) is also prevented. When the supply of air is completed (maintaining the inflated state), the air tube 27 connected to the supply port 23 of the straight pipe lining jig 20A is removed, and the process proceeds to the hardening and curing process.

[0066] In the hardening and curing process, the lining material 11A is heated while waiting for it to harden. In this embodiment, warm air is blown (using a futon dryer), and the lining material 11A (its resin) hardens in about 3 hours. Once the lining material 11A has hardened, the process proceeds to the removal process.

[0067] In the removal process, first, the straight pipe lining jig 20A is deflated and then 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 FIG. 11).

[0068] If burrs or other irregularities occur at both ends of the hardened lining material 11A, it is preferable to finish these portions by polishing the surface and painting them with a resin by brush (finishing step).

[0069] In this way, in the method for repairing a drainage pipe, when air is supplied in the pressing process, the straight expansion portion 42 expands to a shape that is approximately complementary to the straight pipe section 10A. Therefore, the pressing force of the straight expansion portion 42 pressing the lining material 11A against the straight pipe section 10A acts uniformly and simultaneously over the entire area. This makes it possible to prevent wrinkles and lifting in the lining material 11A as much as possible.

[0070] [How to repair drainage pipes (bent pipe sections)] As shown in Figures 12 to 14, this repair method also uses a curved cylindrical lining material 11B that covers the curved pipe section 10B, as in the above repair method. 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 pipes 15 made of polyvinyl chloride are set in contact with both ends of the curved pipe section 10B so as to surround each end of the protruding curved section expansion section 72.

[0071] The method for renovating the drain outlet at the curved pipe portion 10B includes a polishing process for removing rust and bumps on the inner surface of the curved pipe portion 10B, an attachment process for attaching the lining material 11B to the inner surface of the curved pipe portion 10B, an attachment and setting process for attaching a release film 12B to the surface of the lining material 11B and setting a pair of short pipes 15, an insertion process for inserting and setting the curved pipe lining jig 20B into the curved pipe portion 10B (see Figure 12), a pressing process for supplying air to the curved pipe lining jig 20B to expand the expandable film 52 (see Figure 13), a hardening and curing process for hardening the resin in the lining material 11B, and a removal process for removing the curved pipe lining jig 20B, the release film 12B, etc. after removing 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 basically performed in substantially the same process. Therefore, the insertion process, the pressing process, and the removal process will be described here, and the description 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 portion 10B in which the lining material 11B and the release film 12B are set (see FIG. 12). In this insertion operation, the flexibility of the curved pipe lining jig 20B is utilized to insert the curved pipe lining jig 20B while bending it. In this case, too, the curved pipe lining jig 20B is inserted into the curved pipe portion 10B, that is, the curved pipe lining jig 20B (bent portion expansion portion 72) is set in such a way that both ends of the curved pipe lining jig 20B protrude from the curved pipe portion 10B. Needless to say, the short pipe 15 is positioned in the protruding portion. After the insertion and setting are completed, an 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 FIG. 13). As a result, the inflatable membrane body 52 (curved portion inflatable portion 72) inflates to a shape that is approximately complementary to the inner surface of the curved pipe portion 10B, and presses the lining material 11B to adhere to the inner surface of the curved pipe portion 10B. In this case, the expansion of the curved portion inflatable portion 72 is received by the curved pipe portion 10B and the pair of short pipes 15 that follow it, so that wrinkles and the like do not occur at both ends of the lining material 11B. In addition, the curved portion inflatable portion 72 (the portion protruding from the curved pipe portion 10B) is prevented from bursting. When the supply of air is completed (maintaining the inflated state), the air tube 57 connected to the supply port 53 of the curved pipe lining jig 20B is removed, and the process proceeds to the hardening and curing process.

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

[0076] In this manner, in the method for repairing a drainage pipe, when air is supplied in the pressing step, the curved portion expansion portion 72 expands to a shape that is approximately complementary to the curved pipe portion 10B. Therefore, the pressing force of the curved portion expansion portion 72 pressing the lining material 11B against the curved pipe portion 10B acts uniformly and simultaneously over the entire area. This makes it possible to prevent wrinkles and lifting in the lining material 11B as much as possible. [Explanation of symbols]

[0077] 10A...straight pipe portion, 10B...curved pipe portion, 11A...lining material, 11B...lining material, 12A...release film body, 12B...release film body, 15...short pipe, 20A...curved pipe lining jig, 20B...curved pipe lining jig, 21...jig body, 22...expansion film body, 23...supply port, 24...air chamber, 25...gap space, 31...main body portion, 33a...shallow groove, 35a...shallow groove, 41...annular seal portion, 42...straight pipe expansion portion, 43...folded pipe, 45...string-like body, 51...jig body, 52...expandable membrane body, 53...supply port, 54...air chamber, 55...gap space, 61...main body portion, 63a...shallow groove, 65a...shallow groove, 71...annular seal portion, 72...curved pipe expansion portion, 73...folded pipe, 75...string-like body, C...concrete, S...slab,

Claims

1. A lining jig that attaches a lining material, which is a fiber reinforced material impregnated with a resin, to the inner surface of a straight pipe portion of a pipe, a rigid, straight-shaped jig body having an air supply port at one end and an air chamber formed therein that is connected to the supply port; an inflatable membrane body that covers the outer periphery of the jig body with a clearance space communicating with the air chamber and that inflates into a shape substantially complementary to the inner surface of the straight pipe portion by air supplied from the supply port through the air chamber; The inflatable membrane body is characterized in that it has two annular seal portions at both ends that maintain airtightness between the inflatable membrane body and the jig body, and an inflatable portion of a length corresponding to the straight pipe portion formed between the two annular seal portions.

2. A lining jig that attaches a lining material, which is a fiber reinforced material impregnated with a resin, to the inner surface of a curved pipe portion of a pipe, a flexible and curved jig body having an air supply port at one end and an air chamber formed therein that is connected to the supply port; an inflatable membrane body that covers the outer periphery of the jig body with a clearance space communicating with the air chamber and that inflates into a shape substantially complementary to the inner surface of the curved pipe portion by air supplied from the supply port through the air chamber; The inflatable membrane body is characterized in that it has two annular seal portions at both ends that maintain airtightness between the inflatable membrane body and the jig body, and an inflatable portion of a length corresponding to the curved pipe portion formed between the two annular seal portions.

3. 3. The lining jig according to claim 1, wherein the inflatable membrane has a radial expansion width of about 10 mm for attaching the lining material.

4. 3. The lining jig according to claim 1, wherein each of the annular seal portions is formed by tying an end of the inflatable membrane body to an outer periphery of the jig body with a string-like body.

5. 5. The lining jig according to claim 4, wherein an annular shallow groove is formed on the outer periphery of the jig body in correspondence with a position where the string-like body is tied.

6. 5. The lining jig according to claim 4, wherein the inflatable membrane body has a pair of folded back portions which are folded back and overlapped at each of the annular seal portions.

7. The supply port is configured with a female coupler equipped with a check valve; 3. The lining jig according to claim 1, wherein the check valve opens when a male coupler on an air supply source side is connected to the female coupler and closes when the connection is released.

8. A method for repairing a drainage pipe, comprising lining a straight portion of an existing drainage pipe using the lining jig according to claim 1, an attachment step of attaching the lining material to an inner surface of the straight pipe portion; a bonding step of bonding a release film for peeling to a surface of the lining material; an insertion step of inserting and setting the lining jig into the straight pipe portion; a pressing step of supplying air to the lining jig so that the lining material is pressed by the inflatable membrane body to adhere to the inner surface of the straight pipe portion; a curing step of curing the resin in the lining material; A method for repairing a drainage pipe, comprising a removal process for removing the lining jig and the release film from the straight pipe portion after removing the air.

9. In the insertion step, the lining jig is inserted and set so that an end of the expansion portion protrudes from an end of the straight pipe portion, The drainage pipe renovation method described in claim 8, further comprising a pipe setting process between the insertion process and the pressing process, 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.

10. A method for repairing a drainage pipe, comprising lining a curved portion of an existing drainage pipe using the lining jig according to claim 2, an attachment step of attaching the lining material to an inner surface of the bent pipe portion; a bonding step of bonding a release film for peeling to a surface of the lining material; an insertion step of inserting and setting the lining jig into the curved pipe portion; a pressing step of supplying air to the lining jig so that the lining material is pressed by the inflatable membrane body to adhere to the inner surface of the bent pipe portion; a curing step of curing the resin in the lining material; A method for repairing a drainage pipe, comprising a removal process for removing the lining jig and the release film from the bent pipe portion after the air has been removed.

11. In the insertion step, the lining jig is inserted and set so that an end of the expansion portion protrudes from an end of the curved pipe portion, The drainage pipe renovation method described in claim 10, further comprising a pipe setting process between the insertion process and the pressing process, in which a short pipe that 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.

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