Pipeline lining method

Abstract

To provide a pipeline lining method in which an inner periphery surface of a pipeline buried underground is lined by using a pipeline inner periphery-side intermediate body to improve a strength of a cured thermosetting resin.SOLUTION: A pipeline lining method comprises: a drawing step of drawing a pipeline inner periphery-side intermediate body having a lining material 10 impregnated with an uncured thermosetting resin into a pipeline K buried underground; a lining step in which a heated fluid is supplied to an inside of the lining material 10, the lining material 10 is pressed against an inner periphery surface K3 of the pipeline K, and the thermosetting resin is cured, wherein the lining step is a step of supplying a heating fluid at a temperature higher than a temperature of the heating fluid that is supplied up until that point, after a curing-heat of the thermosetting resin is generated.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] This relates to a pipeline lining method in which the inner surface of a pipeline buried underground is lined with an intermediate body on the inner periphery of the pipeline. [Background technology]

[0002] Some buried sewer pipes and other pipelines are damaged due to aging, subsidence, fluctuations in ground pressure, etc. When repairing damaged existing pipes, trenchless repair is preferable in terms of reducing repair costs and minimizing traffic disruptions.

[0003] Therefore, various techniques have been proposed as trenchless repair methods for existing pipes, in which a lining material is pressed against the inner peripheral wall of the existing pipe to line the inner peripheral wall with the lining material (see, for example, Patent Documents 1 and 2). Even when a new pipeline is buried, the inner peripheral wall of the newly installed pipe may be lined with a lining material.

[0004] The lining material is impregnated with a thermosetting resin, and the lining material must be pressed against the inner peripheral wall by a heated fluid. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-93555 [Patent Document 2] Japanese Patent Application Publication No. 8-158465 Summary of the Invention [Problem to be solved by the invention]

[0006] It has been desired to increase the strength of cured thermosetting resins.

[0007] In view of the above circumstances, the present invention aims to provide a pipeline lining method that can increase the strength of the cured thermosetting resin. [Means for solving the problem]

[0008] The pipeline lining method of the present invention, which solves the above-mentioned object, comprises the steps of: a drawing step of drawing an intermediate body on the inner periphery of the pipeline, which is provided with a lining material impregnated with an uncured thermosetting resin, into a pipeline buried underground; a lining step of supplying a heated fluid to the inside of the lining material, pressing the lining material against the inner circumferential surface of the pipeline, and curing the thermosetting resin; The lining step is characterized in that it is a step of supplying a heating fluid having a temperature higher than that of the heating fluid that has been supplied up to that point, after the curing and heat generation of the thermosetting resin occurs.

[0009] Also, the drawing step is a step of drawing the pipeline inner peripheral side intermediate body, which includes a volume reducing member having a main body portion extending in an extension direction of the pipeline, into the inside of the lining material, The lining step may be characterized by supplying a heated fluid between the main body and the lining material.

[0010] moreover, the retracting step is a step of retracting the pipeline inner peripheral side intermediate body including the volume reducing member having the main body portion that expands when filled with fluid, The method further includes a volume reduction step of filling a fluid into the main body of the pipeline inner circumferential side intermediate body drawn into the pipeline to expand the main body, The lining step may be characterized by supplying a heated fluid between the expanded main body portion and the lining material. [Effects of the Invention]

[0011] According to the present invention, a pipeline lining method can be provided that can increase the strength of the cured thermosetting resin. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1A is a perspective view showing one embodiment of a lining material, FIG. 1B is a view showing the state before a volume-reducing member is inserted inside the lining material, and FIG. 1C is a view showing the state after the volume-reducing member has been inserted inside the lining material. [Figure 2] 3 is a flowchart showing a process for lining a pipeline at a construction site using the pipeline inner periphery side intermediate body shown in FIG. 1. [Figure 3] FIG. 10 is a schematic view showing a state in which the intermediate body on the inner periphery side of the pipeline is being pulled into the pipeline. [Figure 4] 3 is a cross-sectional view showing a state in which the diameter of the lining material is expanded in step S5 shown in FIG. 2. FIG. [Figure 5] 3 is a cross-sectional view schematically showing a state in which the supply of heating fluid is continued in step S6 shown in FIG. 2. FIG. [Figure 6] 10 is a graph roughly showing an example of changes in the temperature and other parameters of compressed air supplied to the main body outer space. [Figure 7] FIG. 10 is a cross-sectional view showing a state in which the diameter of the lining material of the intermediate body on the inner periphery of the pipeline of the modified example is expanded. [Figure 8] 10A and 10B are diagrams showing two types of modified examples of the intermediate body on the inner circumference side of the pipeline. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] FIG. 1(A) is a perspective view showing one embodiment of a lining material.

[0015] The lining material 10 shown in FIG. 1(A) is a sleeve-shaped material used to line the inner wall of a sewer pipe buried underground, and FIG. 1(A) shows the sleeve-shaped lining material 10 flattened. This lining material 10 is made up of two integrated sleeve-shaped lining materials, a base hose 100 and a calibration hose 110. Hereinafter, the radially outer side of the lining material 10 will be simply referred to as the "outside," and the radially inner side will be simply referred to as the "inside." The base hose 100 is located outside the calibration hose 110. The calibration hose 110 is thinner than the base hose 100.

[0016] The base hose 100 has a base layer 101 and an outer film layer 102. The base layer 101 shown in Fig. 1(A) is a polyester nonwoven fabric. However, this base layer 101 is not limited to polyester, and may be a nonwoven fabric made of an organic fibrous material such as nylon, acrylic, or vinylon, a woven fabric made of such an organic fibrous material, a nonwoven fabric or woven fabric made of an inorganic fibrous material such as carbon fiber or glass fiber, or a combination of an organic fibrous material and an inorganic fibrous material.

[0017] The base layer 101 shown in FIG. 1(A) is impregnated with a compound. The compound impregnated into the base layer 101 is mainly composed of vinyl ester (epoxy acrylate) resin. Note that unsaturated polyester resin, urethane acrylate resin, or the like may be used instead of vinyl ester resin. Vinyl ester is a type of thermosetting resin that crosslinks with a radically polymerizable monomer. The compound contains a crosslinking agent, a viscosity adjuster, a filler, a curing agent (peroxide, etc.), various additives, and the like.

[0018] The outer film layer 102 covers the base layer 101 from the outside and has the function of preventing the compound impregnated in the base layer 101 from seeping outward. In other words, the outer film layer 102 is water-impermeable. The outer film layer 102 shown in FIG. 1(A) has a laminated structure (PE / NY / PE) in which nylon (NY) is sandwiched between polyethylene (PE). Note that other polyolefins such as polypropylene may be used instead of polyethylene, and the outer film layer 102 may have a single-layer structure instead of a laminated structure.

[0019] The calibration hose 110 has a base material layer 111 and an extension layer 112. The base material layer 111 of the calibration hose 110 shown in Fig. 1(A) is also a polyester nonwoven fabric, like the base material layer 101 of the base hose 100. Note that this base material layer 111 is not limited to polyester, and may be a nonwoven fabric made of an organic fibrous material such as nylon, acrylic, or vinylon, a woven fabric made of such an organic fibrous material, a nonwoven fabric or woven fabric made of an inorganic fibrous material such as carbon fiber or glass fiber, or even a combination of an organic fibrous material and an inorganic fibrous material.

[0020] The base material layer 111 of the calibration hose 110 shown in Fig. 1(A) is also impregnated with a compound. The compound used in the calibration hose 110 also contains a curable resin as its main component, and the curable resin used here can be a thermosetting resin selected from unsaturated polyester, epoxy (meth)acrylate, urethane (meth)acrylate, and unsaturated polyester acrylate. This compound also contains a crosslinking agent, a viscosity modifier, a filler, a curing agent (peroxide, etc.), various additives, etc.

[0021] The stretchable layer 112 is made of polyurethane and has excellent stretchability, forming the innermost circumferential surface of the lining material 10. In other words, it has superior stretchability to the outer film layer 102 of the base hose 100.

[0022] Next, a method for manufacturing the lining material shown in Fig. 1(A) will be described. The method described here is carried out in a factory.

[0023] First, appropriate materials suitable for the pipeline to be lined are prepared. The materials prepared here include a base hose 100 that is not impregnated with a compound and a calibration hose 110 that is also not impregnated with a compound. These hoses (100, 110) are sleeve-shaped and cut to the length corresponding to the length of the pipeline to be lined, and are prepared separately. The base hose 100 prepared here has an outer film layer 102 on the outside and a base layer 101 on the inside of the outer film layer 102. On the other hand, the calibration hose 110 has an extensible layer 112 on the outside and a base layer 111 on the inside of the extensible layer 112. In other words, the calibration hose 110 is upside down compared to the calibration hose 110 shown in FIG. 1(A).

[0024] Also prepared are the base hose base resin, a filler, a curing agent (such as peroxide), and various additives that form the basis of the compound to be impregnated into the base hose 100. The base hose base resin prepared here is primarily composed of vinyl ester, a thermosetting resin (50% by weight or more). The compound also contains a crosslinking agent and a viscosity modifier. The base hose base resin also contains silica as a thixotropic agent, cobalt naphthenate as a curing accelerator, and a polymerization inhibitor.

[0025] Also prepared are a calibration hose base, a filler, a curing agent, and various additives that form the basis of the compound to be impregnated into the calibration hose 110. The calibration hose base also has thermosetting resin as its main component. The calibration hose compound also contains methacrylate ester as a cross-linking agent and viscosity adjuster.

[0026] Next, resin mixing is performed. Here, the base hose compound is prepared by mixing the base resin, filler, curing agent, and various additives for the base hose. The calibration hose compound is also prepared by mixing the calibration hose compound, filler, curing agent, and various additives for the calibration hose.

[0027] Next, the base material layer 101 of the base hose 100 is impregnated with the prepared base hose compound. Also, the base material layer 111 of the calibration hose 110 is impregnated with the prepared calibration hose compound. The base material layer 101 of the base hose 100 is impregnated with the compound to a saturation level, and the base material layer 111 of the calibration hose 110 is impregnated with the compound to a supersaturation level. In other words, the impregnation rate of the compound is set higher in the base material layer 111 of the calibration hose 110 than in the base material layer 101 of the base hose 100. In this way, the base hose 100 impregnated with the compound and the calibration hose 110 in which the base material layer 111 impregnated with the compound is located on the inner side are prepared separately. Note that the base material layer 101 of the base hose 100 may be impregnated with the compound to a supersaturation level, and the base material layer 111 of the calibration hose 110 may be impregnated with the compound to a saturation level.

[0028] Next, the calibration hose 110 is inverted and inserted inside the base hose 100 that has been impregnated with the compound. In the inverted insertion, the calibration hose 110, with its base material layer 111 located on the inside, is turned over so that the base material layer 111 is on the outside, and the calibration hose 110 is inserted inside the base hose 100. The calibration hose 110 is inserted into the base hose 100 from one end side, and then inverted and inserted by the force of air or water. Since the calibration hose 110 is thinner than the base hose 100, inverted insertion is easily performed. By inverting and inserting the calibration hose 110, the base material layer 101 of the base hose 100 and the base material layer 111 of the calibration hose 110 come into contact, and the lining material 10 shown in FIG. 1 is completed, which is an integrated lining material consisting of two sleeve-shaped lining materials, the base hose 100 and the calibration hose 110. As shown in Figure 1, the outermost surface of the lining material 10 is composed of an outer film layer 102 and its innermost surface is composed of an extension layer 112, and base material layers 101, 111 impregnated with a thermosetting resin are arranged between the outer film layer 102 and the extension layer 112.

[0029] Furthermore, a volume reducing member is inserted inside the lining material 10 .

[0030] FIG. 1(B) is a diagram showing the state before the volume reducing member is inserted inside the lining material, and FIG. 1(C) is a diagram showing the state after the volume reducing member has been inserted inside the lining material.

[0031] The configuration of the volume reducing member 20 will be described in detail later, but it has a cylindrical main body 21 and three support portions 22 that are evenly arranged around the periphery of the main body 21. Although only two support portions 22 are shown in FIGS. 1(B) and 1(C), the support portions 22 are fixed around the periphery of the main body 21 at 120-degree intervals. Each support portion 22 is cylindrical and has a smaller diameter than the main body 21, but the right-hand end in the drawing is closed. The right-hand end of each support portion 22 may be closed at the construction site.

[0032] As shown in FIG. 1(B), the tip of the volume reducing member 20 is tied with a string-like body R such as a rope, and the string-like body R is wound up, thereby completely pulling the volume reducing member 20 into the lining material 10 through the one end opening 10a of the lining material 10.

[0033] In Figure 1(C), the portion of the volume reducing member 20 that is housed within the lining material 10 is shown by a dotted line. The main body portion 21 is longer than the lining material 10, with both ends protruding from the lining material 10. On the other hand, the support portion 22 is shorter than the lining material 10, with the closed end on the right side of the figure being inside the lining material 10 and the end on the left side being in the same position as the end of the lining material 10. The volume reducing member 20 inserted inside the lining material 10 becomes the pipeline inner peripheral intermediate body 1. Therefore, Figure 1(C) is a diagram showing the completed pipeline inner peripheral intermediate body 1.

[0034] Finally, the completed pipeline inner periphery side intermediate body 1 is flattened and folded in a zigzag pattern and stored at low temperature. The completed pipeline inner periphery side intermediate body 1 may also be stored at low temperature in a rolled-up state. The pipeline inner periphery side intermediate body 1 stored at low temperature is transported to the construction site in a refrigerated truck in its folded state.

[0035] Next, the pipeline lining method at the construction site will be described.

[0036] FIG. 2 is a flowchart showing a process for lining a pipeline at a construction site using the pipeline inner periphery side intermediate body shown in FIG.

[0037] First, preparations for construction are made at the construction site (Step S1), then the inside of the pipeline is cleaned and an inspection of the pipeline is carried out using a television camera that travels inside the pipeline (Step S2). Through this inspection, any damaged areas in the pipeline can be confirmed.

[0038] Next, the pipe inner periphery side intermediate body 1 is pulled into the pipe (step S3).

[0039] FIG. 3 is a schematic view showing a state in which the intermediate body on the inner periphery side of the pipeline is being pulled into the pipeline.

[0040] The pipeline K to be lined is made of concrete and installed between manholes M1 and M2 to carry sewage. It is buried underground but can be accessed from above ground through manholes M1 and M2. Cracks C1 to C4 have occurred throughout this pipeline K, and the inner circumferential surface of the pipeline K will be lined along its entire length (between manholes M1 and M2) with a lining material 10 shown in Figure 1(A). Note that Figure 3 shows the entire length of the pipeline K as being significantly shorter than it actually is.

[0041] The pipeline inner periphery side intermediate body 1, which has been transported in a refrigerated truck CC, is pulled from the refrigerated truck CC through a manhole M1 into the pipeline K. First, the refrigerated truck CC is stopped near the entrance M11 of one manhole (hereinafter referred to as the departure manhole M1) connected to the pipeline K to be lined, and a winch W is installed near the entrance M21 of the other manhole (hereinafter referred to as the arrival manhole M2) connected to the pipeline K to be lined. Next, the rear end of the pull-in wire Y1 wound around the winch W is inserted into the arrival manhole M2 via a pulley P, and the pull-in wire Y1 is passed through to the departure manhole M1.

[0042] The leading end of the pipeline inner periphery intermediate body 1 is tied with a bundling wire Y2, and the trailing end of the lead-in wire Y1, which has been threaded all the way to the starting manhole M1, is connected to the lead-in wire Y2 inside the starting manhole M1. A winch W installed near the entrance M21 of the arrival manhole M2 winds up the lead-in wire Y1, and the pipeline inner periphery intermediate body 1 is pulled into the pipeline from the connection (entrance K1) between the pipeline K and the starting manhole M1. Both the lining material 10 and the volume reduction member 20 that make up the pipeline inner periphery intermediate body 1 are soft and can be easily bent in the longitudinal direction. Therefore, as it is pulled into the pipeline, it bends at the entrance M11 of the starting manhole M1 and the entrance K1 of the pipeline K. When the leading end of the pipeline inner periphery side intermediate body 1 bound with the binding wire Y2 emerges from the connection part (exit K2) with the arrival side manhole M2 of the lining pipeline K, the winch W is stopped and the pulling-in is completed. The above-described step S3 corresponds to an example of the pulling-in process of the present invention.

[0043] Next, the pipeline inner periphery intermediate body 1 is set in the pipeline (step S4). First, the binding wire Y2 is removed from the pipeline inner periphery intermediate body 1. The arrival side end of the lining material 10 protrudes from the outlet K2 of the pipeline K, and the arrival side ends of the volume reducing member 20 (the arrival side ends of the main body 21 and the support portion 22) also protrude from the outlet K2. Meanwhile, the departure side end of the lining material 10 has not been drawn into the pipeline and remains just before the entrance K1, and the departure side ends of the volume reducing member 20 (the departure side ends of the main body 21 and the support portion 22) have also not been drawn into the pipeline and remain just before the entrance K1.

[0044] In step S4, a destination-side plug member 31 is fitted into the open end of the destination side (exit K2 side) of the pipeline inner-periphery-side intermediate body 1 (see FIG. 5). The destination-side plug member 31 is a donut-shaped rigid body with a through-hole in the center through which the main body 21 passes. The destination-side plug member 31 is attached to the open end of the destination side (exit K2 side) of the lining material 10 from the inner periphery side, and is tightened from the outer periphery side with a tightening member 33 (see FIG. 5). As a result, with the lining material 10, destination-side plug member 31, and main body 21 positioned in this order from the outside, the destination side (exit K2 side) between the main body 21 and the lining material 10 is sealed. The destination-side end (exit K2 side) of the main body 21 is crushed to close the destination-side opening, and then tied with a band 21B (see the right side of FIG. 5). The opening on the arrival side of the main body 21 may be tied with the band 21B before the pipeline inner periphery side intermediate body 1 is pulled into the pipeline. For example, the band 21B may be tied before or after inserting the volume reducing member 20 into the lining material 10 at a factory, or when the leading end of the pipeline inner periphery side intermediate body 1 is tied with the bundling wire Y2.

[0045] Furthermore, a start-side plug member 32 is fitted into the open end on the start side (inlet K1 side) of the pipeline inner peripheral side intermediate body 1, and is tightened from the outer peripheral side of the lining material 10 with a tightening member 34 (see FIG. 5). As a result, the start side (inlet K1 side) between the main body 21 and the lining material 10 is sealed, and the start side (inlet K1 side) of the main body 21 is also sealed. A compressed air supply port 321 that supplies compressed air to the main body 21 is provided in the center of the start-side plug member 32, and heated air supply ports 322 that supply heated air to the support part 22 are provided around it at 120-degree intervals (see FIG. 5). Note that only one heated air supply port 322 is shown in FIG. 5.

[0046] Additionally, in step S4, a compressor 36 and a mixing device 37 are installed near the entrance M11 of the starting-side manhole M1 (see FIG. 5). A supply hose SH extends from the mixing device 37. The supply hose SH branches, with one branch connected to the compressed air supply port 321 of the starting-side plug member 32 and the other connected to the heated air supply port 322. A main body valve SH1 is provided at the branched portion of the supply hose SH that is connected to the compressed air supply port 321, and a support valve SH2 is provided at the branched portion that is connected to the heated air supply port 322 (see FIG. 5).

[0047] Once the above preparations are complete, the main body valve SH1 is opened, the compressor 36 is operated, and compressed air begins to be supplied to the main body 21 via the mixer 37. The temperature of the compressed air here is room temperature or low. The temperature of the compressed air must be kept at a temperature that does not start to thermally harden the thermosetting resin impregnated in the lining material 10. The supply of compressed air continues until the main body 21 has sufficiently expanded to become cylindrical, and once the main body 21 has sufficiently expanded, the main body valve SH1 is closed and the supply of compressed air is stopped.

[0048] Next, in step S5 shown in FIG. 2, the lining material 10 is expanded in diameter, and in the subsequent step S6, the supply of the heating fluid is continued.

[0049] FIG. 4 is a cross-sectional view showing the state in which the diameter of the lining material is expanded in step S5 shown in FIG. 2. This cross-sectional view is a view taken in a direction perpendicular to the extension direction of the pipeline K. FIG. 5 is a cross-sectional view that schematically shows the state in which the supply of heating fluid is continued in step S6 shown in FIG. 2. The cross-sectional view of FIG. 5 is a view taken in a section along the extension direction of the pipeline K, and the left-right direction of the figure is the extension direction of the pipeline K. In FIG. 5, as in FIG. 3, the total length of the pipeline K is shown much shorter than it actually is. Also, the thickness of the lining material 10 is shown much thicker than it actually is.

[0050] 5 shows a boiler truck BC parked near the entrance M11 of the starting manhole M1 in place of the refrigerated truck CC shown in FIG. 3. Steam from a boiler 35 and compressed air from a compressor 36 loaded on the boiler truck BC are supplied to the mixing device 37. A steam valve 351 is provided on the pipe connecting the boiler 35 and the mixing device 37, and a compressed air valve 361 is provided on the pipe connecting the compressor 36 and the mixing device 37. By opening and closing these valves (351, 361), it is possible to adjust the temperature and flow rate of the gas supplied to the pipeline inner periphery side intermediate body 1.

[0051] 5, the starting-side opening of the main body 21 is fixed, and the starting-side openings of the support portions 22 are also fixed.

[0052] Furthermore, starting-side plug member 32 is also provided with a fluid discharge port 323 at the 6 o'clock position. An exhaust device 38 is also installed near entrance M11 of starting-side manhole M1. This exhaust device 38 has a sound-absorbing section 381 and an exhaust duct 382. Fluid discharge port 323 and sound-absorbing section 381 are connected by a recovery hose CH.

[0053] Compressed air at approximately 80°C is used to expand the lining material 10 in step S5. Hereinafter, this compressed air at a temperature of approximately 80°C or higher may be simply referred to as heated air. The heated air is prepared by mixing steam heated to 100°C or higher by the boiler 35 shown in FIG. 5 with compressed air from the compressor 36 in a mixer 37, and is supplied through the supply hose SH. The main body valve SH1, which was closed at the end of step S4, remains closed, and the support valve SH2 is opened to supply heated air to each support part 22. The support part 22 is a cylindrical body with a closed end on the destination side (exit K2 side). The destination side is shorter than the main body part 21 and extends only to the end just before the destination-side plug member 31. However, the starting-side end of the support part 22 extends beyond the outlet K2 of the pipeline K. The destination-side end of the lining material 10 also extends beyond the outlet K2 of the pipeline K. The support portion 22 is fixed to the main body portion 21 continuously over its entire length, but may be fixed intermittently. Furthermore, the support portion 22 is provided with round holes 222 each having a diameter of approximately 1 cm at 1-meter intervals from the departure side (the entrance K1 side) to the arrival side (the exit K2 side), and slit holes 221 are provided further beyond the round holes 222. The slit holes 221 are, for example, several centimeters wide and approximately 10 to 20 cm long, but in FIG. 5 , they are depicted as being significantly larger than the round holes 222. As shown in FIG. 5 , the round holes 222 and the slit holes 221 are aligned in a row in the direction in which the duct K extends, and another round hole 222 and a slit hole 221 are aligned in a row on the circumferentially opposite side of the support portion 22 by 180 degrees in the direction in which the duct K extends. The amount of heated air supplied by the supply hose SH is greater than the amount of heated air blown out from the round holes 222 and the slit holes 221, causing the support portion 22 to expand into a cylindrical shape.

[0054] FIG. 4 shows a main body portion 21 that bulges out cylindrically and support portions 22 that bulge out cylindrically at three locations around the main body portion 21. When the support portions 22 bulge out cylindrically, each support portion 22 contacts the inner circumferential wall K3 of the pipeline K, sandwiching the lining material 10 therebetween. The support portions 22 correspond to an example of a spacing maintaining portion that maintains a spacing between the main body portion 21 that bulges out cylindrically and the lining material 10. Hereinafter, the space of this spacing will be referred to as the space MS outside the main body portion. In the pipeline inner peripheral side intermediate body 1 shown in FIG. 4, the support portions 22 contact the inner circumferential wall K3 of the pipeline K, sandwiching the lining material 10 therebetween, at the 12 o'clock position, the 4 o'clock position, and the 8 o'clock position. In this way, the support portions 22 contact the inner peripheral wall K3 of the pipeline K at three circumferentially evenly spaced locations, sandwiching the lining material 10 therebetween, so that the center position of the cylindrically bulging main body portion 21 substantially coincides with the center position of the pipeline K, and the main body portion 21 is stably supported within the pipeline K. Furthermore, the contact of the support portions 22 with the lining material 10 also prevents the entire volume reducing member 20 from rotating around its axis. In particular, if the support portions 22 are pressed against the lining material 10, rotation of the entire volume reducing member 20 is firmly prevented. Note that only the support portion 22 provided at the 12 o'clock position is shown in FIG. 5.

[0055] Note that from the stage of supplying room temperature compressed air to the main body 21 in step S4, the support part valve SH2 may also be opened to supply compressed air to each support part 22, inflating each support part 22, and then in step S5, the room temperature compressed air may be switched to heated air. In this way, the inflation of each support part 22 will be completed before the inflation of the main body 21 is completed, making it easier for the center position of the cylindrically inflated main body 21 to coincide with the center position of the pipeline K. Furthermore, the time spent waiting for each support part 22 to inflate is reduced, leading to a shorter construction period.

[0056] Even if the support portion 22 expands into a cylindrical shape, as the supply of heated air from the supply hose SH continues, the main body portion outer space MS is filled with heated air blown out from the slit hole 221 and the round hole 222. The volume of the main body portion outer space MS is narrowed to less than two-thirds of the volume of the duct K, significantly reducing the amount of heated air required to fill the main body portion outer space MS. In other words, the volume reducing member 20 reduces the volume of the duct K by more than one-third. If the volume reduction rate achieved by the volume reducing member 20 is less than 30%, the effect of reducing the energy cost for supplying heated air will be diminished. To fully achieve the effect of reducing the energy cost for supplying heated air, it is preferable to reduce the volume by 50% or more using the volume reducing member 20. However, if the volume of the main body portion outer space MS becomes too small, the heating effect will be diminished, so it is also necessary to limit the volume reduction rate achieved by the volume reducing member 20 to 75% or less.

[0057] The heated air supplied to the main body outer space MS on the arrival side (exit K2 side) of the lining material 10 flows through the main body outer space MS toward the fluid discharge port 323 provided in the starting-side plug member 32, gradually decreasing in temperature, and is then sent from the fluid discharge port 323 through the recovery hose CH to the muffling section 381. The muffling section 381 has an internal space with a cross-sectional area larger than that of the recovery hose CH, and is also equipped with a sound-absorbing material. The heated air carries sound waves such as the cooking noise of the boiler 35, and also generates noise emitted into the atmosphere. The muffling section 381 muffles these sounds. The heated air that has passed through the muffling section 381 is exhausted into the atmosphere through the exhaust duct 382.

[0058] Furthermore, drainage occurs within the main body outer space MS. A drainage hole 311 is provided in the arrival-side plug member 31. A pipe equipped with a valve 3111 is connected to this drainage hole 311, and opening the valve 3111 allows drainage of the main body outer space MS.

[0059] The heated air blown out from the slit holes 221 and the round holes 222 into the space MS outside the main body comes into contact with the elongated layer 112 and pushes the elongated layer 112 in the radial direction. As a result, the lining material 10 expands in diameter and is heated until the outer film layer 102 is pressed against the inner circumferential wall K3 of the pipeline K. When the lining material 10 expands in diameter, the elongated layer 112 stretches well, and the inner circumferential surface of the lining material 10 formed by the elongated layer 112 becomes a smooth surface.

[0060] FIG. 6 is a graph roughly showing an example of changes in the temperature of compressed air supplied to the main body-exterior space MS. In this graph, the horizontal axis represents time, and the vertical axis represents temperature (°C). The solid line graph roughly shows the temperature of the compressed air supplied to the main body-exterior space MS. The temperature here is the set temperature of the mixer 37. Furthermore, the temperature of the lining material 10 itself is measured at both the end of the lining material 10 on the arrival side (exit K2 side) and the end of the lining material 10 on the outlet K2 side. At each end, the temperature may be measured at either the bottom or the top of the lining material 10; however, it is preferable to measure the temperature at the bottom after draining the main body-exterior space MS through the drain hole 311. The dashed-dotted line graph roughly shows the measured temperature at the end of the lining material 10 on the arrival side (exit K2 side), and the dotted line graph roughly shows the measured temperature at the end of the lining material 10 on the departure side (inlet K1 side). It is also possible to install optical fibers along the entire length of the lining material 10 and measure the temperature of the lining material at multiple points to perform temperature control.

[0061] The temperature change of the lining material 10 occurs with a delay relative to the temperature change of the compressed air supplied to the main body outer space MS. Furthermore, the temperature change of the lining material 10 at the end on the departure side (the inlet K1 side) occurs with a delay relative to the temperature change at the end on the arrival side (the outlet K2 side) of the lining material 10.

[0062] As described above, compressed air at approximately 80°C is used to expand the diameter of the lining material 10 in step S5. Compressed air at approximately 80°C is blown into the main body outer space MS through the round holes 222 and the slit holes 221 of the support portion 22. When the curable resin hardens, heat is generated during hardening, causing the temperature to rise. The temperature of the lining material 10 reaches a peak temperature (90°C in the example shown in FIG. 6 ), after which the temperature begins to decrease. The temperature of the curable resin itself rises to above 100°C due to its own hardening heat. In FIG. 6 , the two-dot chain line graph represents the heat resistance temperature of the elongation layer 112. The heat resistance temperature of the elongation layer 112 is 120°C, and if the temperature of the curable resin rises to this temperature, the elongation layer 112 will melt. If high-temperature compressed air (e.g., compressed air at 100°C, even if it is not as high as 120°C) is supplied before hardening heat is generated, the hardening heat may be superimposed and the temperature of the curable resin may reach 120°C. For this reason, until the curing heat is generated, a slightly lower compressed air temperature is supplied in anticipation of the curing heat generation, so that the temperature of the curable resin does not reach 120°C even when the curing heat is accumulated. On the other hand, after the curing heat is generated and it is detected that the temperature of the lining material 10 has changed from a temperature increase to a temperature decrease, the temperature of the compressed air is increased. More specifically, after it is detected that the temperature of the lining material 10 has changed from a temperature increase to a temperature decrease and has settled to a substantially constant temperature (70°C in the example shown in Figure 6), the set temperature of the mixer 37 is increased from 80°C to 100°C. When the temperature of the lining material 10 has changed from a temperature increase to a temperature decrease and settled to a substantially constant temperature, the curing of the curable resin is completed to a sufficient level. From this state, the strength of the curable resin can be increased by supplying compressed air at an even higher temperature. In the example shown in Figure 6, the temperature of the lining material 10 is heated to a temperature substantially equal to the peak temperature. The temperature of the compressed air (the set temperature of the mixer 37) can be determined according to the degree of strength improvement of the curable resin. For example, if heating the lining material 10 to a temperature higher than the peak temperature (90°C) is expected to improve the strength, it is preferable to heat it to a higher temperature within the range not exceeding the heat-resistant temperature (120°C).Conversely, if sufficient strength improvement can be expected without heating the lining material 10 to the peak temperature (90°C), it is preferable to only raise the temperature to a specified temperature below the peak temperature in order to reduce the heating costs of the boiler 35.

[0063] When the curable resin is continuously heated by the heated compressed air, the strength improvement ceases after a certain time, so the temperature of the heated compressed air and the heating time are determined in advance through experiments. Examples of heating times include 30 to 90 minutes. As described above, the volume of the space outside the main body MS is reduced to less than two-thirds of the volume of the pipe line K, which continuously reduces the heating costs of the boiler 35 and the operating costs of the compressor 36, and the effect of the volume reduction member 20 is significant. Furthermore, when heating the lining material 10, the compressed air directly hits the lining material 10, resulting in better heating efficiency than when there is something in between.

[0064] By continuing to supply compressed air from step S5 to step S6, the lining material 10 is pressed against the inner wall K3 of the pipeline K, and the thermosetting resin impregnated in the base material layers 101, 111 hardens and increases in strength, so that the inner wall K3 of the pipeline K is lined with the lining material 10, and a new self-supporting pipeline made of the lining material 10 is formed inside the inner wall K3 of the pipeline K.

[0065] During steps S5 to S6, no compressed air is supplied to the main body 21, but the compressed air blown out into the main body outer space MS also warms and expands the air inside the main body 21, thereby maintaining the main body 21 in an inflated state.

[0066] In steps S5 and S6, compressed air is used, but hot water may be used instead of compressed air. When hot water is used, the hot water is supplied to the support part 22 and flows out from the arrival side (exit K2 side) of the lining material 10 into the main body outer space MS, and the hot water is collected from the departure side (inlet K1 side) of the lining material 10 to the boiler 35, reheated, and supplied again to the support part 22 through the supply hose SH. Also, mist may be used instead of heated air.

[0067] Furthermore, to inflate the main body 21, a liquid at room temperature or low temperature may be used instead of compressed air at room temperature.

[0068] Steps S5 and S6 described above correspond to an example of the lining step of the present invention.

[0069] Then, in step S7 shown in FIG. 2, room temperature air is supplied instead of the heated air to cool the hardened lining material 10 and the main body outer space MS.

[0070] In the next step S8, band 21B binding the end of main body 21 on the destination side is removed, and main body 21 is collapsed. Also, destination-side plug member 31 and departure-side plug member 32 are removed, and volume reducing member 20 is removed from inside pipeline K. Furthermore, supply hose SH and recovery hose CH are also removed.

[0071] Thereafter, the pipe openings at both ends are finished (step S9). In this pipe opening finishing, the lining material 10 is cut at each of the inlet K1 and outlet K2 of the pipeline K, and the cut portions are cured.

[0072] In many cases, an attached pipe is already attached to the pipeline. In this case, a hole is drilled at a location corresponding to the connection part of the attached pipe, and the attached pipe is connected to the new self-supporting pipeline made of the lining material 10.

[0073] Finally, the condition of the inner peripheral wall formed by the extension layer 112 of the lining material 10 is finally checked by a television camera (step S10), and the construction site is cleaned up (step S11), completing the entire pipeline repair process.

[0074] Next, a description will be given of modified examples of the pipeline inner periphery side intermediate body 1. In the following description, components having the same names as components described so far will be assigned the same reference numerals as used so far and omitted. Also, descriptions that overlap with those described so far may be omitted.

[0075] 7 is a cross-sectional view showing a state in which the diameter of the lining material of the intermediate body on the inner periphery of the pipeline of a modified example is expanded. This cross-sectional view is a cross-section perpendicular to the extending direction of the pipeline, similar to the cross-sectional view shown in FIG.

[0076] In the volume reducing member 20 shown in Figure 7(A), the main body 21 has a double-cylinder structure. That is, compressed air is supplied to the space 21i between the outer cylinder 211 and the inner cylinder 212 to inflate it. A cavity h1 is formed inside the inner cylinder 212, and the amount of compressed air that needs to be supplied is smaller than that of the main body 21 shown in Figure 3 by the amount of this cavity h1. The support portions 22 are located at the 2 o'clock position, the 6 o'clock position, and the 10 o'clock position.

[0077] In the volume reduction member 20 shown in FIG. 7(B), the main body 21 is provided with thin cylinders 213 extending in the extension direction of the pipe line K, which are arranged around the entire circumference in a circumferentially contacting relationship, forming a hollow h2 in the center. Adjacent thin cylinders 213 are connected to each other in the circumferential direction. The thin cylinders 213 are thinner than the hollow h2 in the center and thinner than the support members 22. These thin cylinders 213 have a common air inlet (not shown) that brings them together on the departure side (the inlet K1 side). When compressed air is supplied through this common air inlet, each thin cylinder 213 expands, forming a thick pipe shape as a whole, as shown in FIG. 7(B). Four support members 22 are provided, and are fixed to the thin cylinders 213 at the 12 o'clock position, the 3 o'clock position, the 6 o'clock position, and the 9 o'clock position, respectively. The number of support members 22 may be five or more.

[0078] The volume reducing member 20 shown in FIG. 7(C) has a structure in which the main body portion 21 and the support portions 22 are integrated. That is, the internal space (main body internal space) 21S of the main body portion 21 and the internal space (support internal space) 22S of each support portion 22 are connected, and in step S4 of setting the pipeline inner circumferential side intermediate body 1 in the pipeline, as shown in FIG. 2, the support portions 22 are expanded to include the support portions 22. The support portions 22 in FIG. 7(C) also maintain a cylindrically expanded main body portion 21 spaced apart from the lining material 10, but are not provided continuously over the entire length of the pipeline K, but are provided intermittently. In this example, when viewed along the entire length of the pipeline K, the support portions 22 are provided at four positions around the circumferential direction of the main body portion 21. Hereinafter, the support portion directly above will be referred to as the first support portion 22-1, the support portion on the right side will be referred to as the second support portion 22-2, the support portion directly below will be referred to as the third support portion 22-3, and the support portion on the left side will be referred to as the fourth support portion 22-4. Of the support portions 22 provided at these four positions, the support portions 22 provided at three positions abut against the inner circumferential wall K3 via the lining material 10, and no support portion 22 is provided at the remaining position. The first support portion 22-1 is not provided at the cross-sectional position in the cross-sectional view shown in FIG. 7(C), and FIG. 7(C) shows the first support portion 22-1 provided further back than the cross-sectional position. FIG. 7(D) is a diagram showing that the support portions 22 are provided intermittently in the extension direction of the main body portion 21. In FIG. 7(D), the left-right direction of the drawing corresponds to the extension direction of the pipeline K. Note that the thickness of the lining material 10 is shown to be much thicker than it actually is. Figure 7(D) shows the first support portion 22-1 and the third support portion 22-3. Figure 7(C) is a cross-sectional view taken along line A-A' in Figure 7(D). Figure 7(D) shows an area a1 where the first support portion 22-1 is not provided and an area a3 where the third support portion 22-3 is not provided.In the extension direction of the pipeline K, a region a1 where the first support portion 22-1 is not provided is followed by a region (not shown) where the second support portion 22-2 is not provided, a region a3 where the third support portion 22-3 is not provided is followed by a region (not shown) where the fourth support portion 22-4 is not provided is followed by a region a1 where the first support portion 22-1 is not provided. In this way, the spaces between the support portions 22 adjacent in the circumferential direction are connected by the regions where the support portions 22 are not provided.

[0079] The support portion 22 is sealed and does not have slit holes 221 or round holes 222. Therefore, in step S4, when the main body 21 expands and the support portion 22 also expands sufficiently to abut against the inner peripheral wall K3 via the lining material 10, the supply of compressed air is terminated and the expanded state is maintained.

[0080] A fluid supply hose 40 is inserted into the pipeline inner circumference side intermediate body 1 shown in FIG. 7(C) in a factory. FIG. 7(C) shows the fluid supply hose 40. The starting end of the fluid supply hose 40 is connected to a supply hose SH extending from a boiler 35 via a starting side plug member 32, and the destination end extends to just before the destination side plug member 31. The fluid supply hose 40 has a plurality of round holes 42 and slit holes 41 (see FIG. 8(C)), similar to the support part 22 shown in FIG. 5. The supply of heated air to the main body outer space MS in steps S5 and S6 is performed by the fluid supply hose 40, and the heated air is supplied to the main body outer space MS through the plurality of round holes 42 and slit holes 41. In the pipeline inner circumference side intermediate body 1 shown in FIG. 5 and the pipeline inner circumference side intermediate body 1 shown in FIGS. 7(A) and 7(B), the support part 22 also serves as the fluid supply hose 40.

[0081] FIG. 7(E) also shows a fluid supply hose 40 identical to the fluid supply hose 40 described using FIG. 7(C), with the lining material 10 in an expanded state. In the volume reducing member 20 shown in FIG. 7(E), the main body 21, inflated with compressed air, is suspended by a hanging member 25 temporarily attached to the ceiling of the lining material 10. The hanging member 25 also corresponds to an example of a spacing member that maintains a gap between the cylindrically inflated main body 21 and the lining material 10. The hanging member 25 is belt-like or string-like and is attached to the lining material 10 at several points along its length. In step S8 shown in FIG. 2, the deflated main body 21 is pulled somewhat strongly, causing the hanging member 25 to peel off from the lining material 10, making it possible to remove the volume reducing member 20. Furthermore, even if the hanging member 25 is omitted and the main body 21 is placed on the bottom of the lining material 10, the supply space for heated air is narrowed by the amount of the main body 21 shown in Figure 7(E), so the heating costs of the boiler 35 and the operating costs of the compressor 36 are continuously reduced, and the effect of the main body 21 shown in Figure 7(E) is great.

[0082] In the volume reducing member 20 shown in FIG. 7(F), the main body 21 is filled with a gas lighter than air (e.g., nitrogen gas). Also shown in FIG. 7(F) is the same fluid supply hose 40 as the fluid supply hose 40 described using FIG. 7(C), with the lining material 10 in an expanded state. Because the main body 21 would otherwise attach to the ceiling of the lining material 10, it is held in place by a retaining member 26 temporarily attached to the bottom of the lining material 10. The retaining member 26 also corresponds to an example of a spacing member that maintains a gap between the main body 21 and the lining material 10. The retaining member 26 is string- or belt-like and is attached to several locations along the length of the lining material 10. In step S8 shown in FIG. 2, the main body 21, from which the air has been removed, is pulled somewhat strongly as before, causing the retaining member 26 to peel off from the lining material 10, allowing the volume reducing member 20 to be removed. Furthermore, even if the retaining member 26 is omitted and the main body 21 is attached to the ceiling of the lining material 10, the supply space for heated air is narrowed by the amount of the main body 21 shown in Figure 7(F), so the heating costs of the boiler 35 and the operating costs of the compressor 36 are continuously reduced, and the effect of the main body 21 shown in Figure 7(F) is also great.

[0083] FIG. 8 shows two modified examples of the intermediate body on the inner circumference side of the pipeline.

[0084] FIG. 8(A) is a view of the pipeline inner-periphery-side intermediate body 1 retracted into the pipeline, as viewed from the inlet K1 side. While the pipeline is not shown in FIG. 8(A), the pipeline inner-periphery-side intermediate body 1, which has been flattened, is curved along the bottom of the inner periphery of the pipeline (not shown). The pipeline inner-periphery-side intermediate body 1 described above also assumes this flattened and curved state when retracted into the pipeline. A fluid supply hose 40 and a volume reduction member 20 are inserted inside the pipeline inner-periphery-side intermediate body 1 shown in FIG. 8(A). The fluid supply hose 40 is also flattened. The volume reduction member 20 has a cylindrical main body 21 and legs 27 attached to four circumferential positions of the main body 21. The main body 21 is also flattened. The legs 27 are rigid bodies made of metal or the like, and are rotatable via link mechanisms provided at their joints. The legs 27 are provided with spring members (not shown) for maintaining the state of extension in the radial direction. The legs 27 shown in Fig. 8(A) are in a state of lying along the main body 21 against the biasing force of the spring members.

[0085] Figure 8(B) is a cross-sectional view showing the state in which the lining material of the intermediate body on the inner periphery of the pipeline shown in Figure 8(A) has been expanded in diameter. This cross-sectional view, like the cross-sectional view shown in Figure 4, is a view of a cross section taken perpendicular to the extending direction of the pipeline. Note that the scale of Figure 8(B) is much smaller than the scale of Figure 8(A).

[0086] Heated air is being supplied to the fluid supply hose 40 shown in FIG. 8(B). The main body 21 shown in FIG. 8(B) is filled with compressed air and expands into a cylindrical shape. As the main body 21 expands, the four legs 27 gradually rise from their reclined positions due to the biasing force of the spring members described above. The legs 27 shown in FIG. 8(B) are just about to be fully extended in the radial direction, with the biasing force of the spring members still in effect. The tips of the legs 27 abut against the inner circumferential wall K3 via the lining material 10, and serve as an example of a spacing retainer that maintains a spacing between the main body 21 and the lining material 10.

[0087] The legs 27 can also be simply configured with plate members that protrude in the radial direction and extend in the extension direction of the pipeline K. In this case, too, the plate members serving as the legs 27 lie flat along the main body 21 when the main body 21 is flattened, and rise as the main body 21 expands, eventually protruding in the radial direction. The plate members do not need to be provided along the entire length of the main body 21, and may be provided at predetermined intervals.

[0088] The main body 21 of the volume reducing member 20 described above is a flexible, tubular member extending in the pipeline extension direction and can be easily bent longitudinally at any position. While the main body 21 is inflated by filling it with compressed air, it may be a rubber pipe or a bellows-shaped pipe. These pipes do not need to be inflated by filling it with compressed air. Furthermore, rubber pipes or bellows-shaped pipes can be bent longitudinally at any position. When using these pipes, it is necessary to provide a spacing member (e.g., support member 22, hanging member 25, or leg member 27) that maintains a gap between the pipe and the lining material 10. These pipes may be pre-inserted into the lining material 10 at a factory, or may be pulled into the lining material 10 placed inside the pipeline at the construction site.

[0089] The main body 21 of the volume reducing member 20 to be described below is made up of connected polystyrene foam blocks, and each of the polystyrene foam blocks cannot be bent.

[0090] Figure 8(C) is a diagram showing a schematic diagram of a connected polystyrene foam block set in a pipeline. In Figure 8(C), the left-right direction of the figure corresponds to the extension direction of the pipeline K, but as in Figure 3, the total length of the pipeline K is shown much shorter than it actually is. Also, the thickness of the lining material 10 is shown much thicker than it actually is.

[0091] The connector 28 shown in FIG. 8(C) is formed by connecting polystyrene foam blocks 281 with a connecting belt 282 and extends in the extension direction of the pipeline K. The connector 28 can be bent at the connecting belt 282. At the factory, the fluid supply hose 40 is simply pulled into the cylindrical lining material 10, and the connector 28 is passed inside the lining material 10 at the site. That is, after the lining material 10 is pulled into the pipeline K, the pull-in wire Y1 shown in FIG. 3 is attached to the tip of the connector 28, and the pull-in wire Y1 is wound by the winch W via the pulley P, thereby passing the connector 28 inside the lining material 10. The connector 28 is passed inside the lining material 10 while bending at the connecting belt 282 at the entrance M11 of the starting manhole M1 or the entrance K1 of the pipeline K. The connector 28 shown in FIG. 8(C) is thus passed through the inside of the lining material 10.

[0092] 8(C), a destination-side plug member 31 is fitted from the inner circumferential side to the open end on the destination side (the outlet K2 side) of the lining material 10. A block 281r at the right end of the connecting body 28 protrudes from a through-hole in the center of this destination-side plug member 31. The destination-side plug member 31 is attached by fitting the right-end block 281r into the through-hole, and the right-end block 281r acts as a lid to seal the destination-side end of the pipeline inner-circumferential-side intermediate body 1. A dedicated plug member 39 is fitted from the inner circumferential side to the open end on the departure side (the inlet K1 side) of the lining material 10. This dedicated plug member 39 has a heated fluid supply port 392 at the 12 o'clock position for supplying heated fluid to the fluid supply hose 40 and a fluid discharge port 393 at the 6 o'clock position. In addition, a through hole is provided in the center of the dedicated plug member 39, similar to the arrival side plug member 31, and the left end block 281l is attached by fitting it into this through hole, so that the left end block 281l acts as a lid and also seals the starting side end of the intermediate body 1 on the inner circumference side of the pipeline.

[0093] Furthermore, a fluid supply hose 40 that has been inserted in advance in a factory extends inside the pipeline inner peripheral side intermediate body 1 shown in Figure 8(C). The fluid supply hose 40 shown in Figure 8(C) extends along the ceiling of the lining material 10 and is sandwiched between the connector 28 and the lining material 10. The space between the connector 28 and the lining material 10 shown in Figure 8(C) is referred to as the connector outer space LS. The end opening on the departure side (inlet K1 side) of the fluid supply hose 40 is fitted into a portion of the dedicated plug member 39 that connects to the heated fluid supply port 392.

[0094] The fluid supply hose 40 shown in FIG. 8(C) also has round holes 42 every 1 meter along the extension direction of the pipeline K, and slit holes 41 at the end on the destination side (the outlet K2 side). In FIG. 8(C), the round holes 42 and slit holes 41 are drawn considerably larger. The round holes 42 and slit holes 41 are aligned in a row along the extension direction of the pipeline K, and round holes 42 and slit holes 41 are also aligned in a row on the opposite 180-degree circumferential side of the fluid supply hose 40 along the extension direction of the pipeline K. In this modification, hot water at approximately 80°C is delivered from the boiler 35 (see FIG. 5) instead of heated air, and the hot water is supplied to the connector outer space LS through the round holes 42 and slit holes 41 of the fluid supply hose 40. The connector outer space LS shown in FIG. 8(C) is filled with hot water. The polystyrene foam block 281 attempts to float up, but is held down by the fluid supply hose 40. In this modified example, the fluid supply hose 40 corresponds to an example of a spacing maintaining section that maintains a spacing between the connector 28 and the lining material 10. The hot water filling the connector outer space LS is recovered into the boiler 35 from a fluid outlet 393 provided in the start-side plug member 32, reheated, and sent out again toward the fluid supply hose 40.

[0095] In the above description, a thermosetting resin is used, but other curable resins may also be used. For example, a photocurable resin may be used. When a photocurable resin is used, cooling air or water is continuously supplied to the main body outer space MS to cool the heat generated during photocuring. As described above, the volume of the main body outer space MS is reduced to less than two-thirds of the volume of the pipe K. This continuously reduces the operating costs of the compressor that continuously supplies cooling air and the pump that continuously supplies cooling water. Therefore, the effect of the volume reducing member 20 is significant even when a photocurable resin is used. Note that when a photocurable resin is used, the main body 21 may be made of a transparent material, and curing light may be irradiated from inside the main body 21.

[0096] Furthermore, although the volume reducing member 20 is disposed over the entire length of the pipeline K (between the departure side manhole M1 and the arrival side manhole M2), it may be disposed over only a portion of the entire length of the pipeline K. That is, the diameter (thickness) and length of the volume reducing member 20 may be determined so that the volume reduction rate achieved by the volume reducing member 20 is 30% or more. Note that, in order to heat the lining material 10 uniformly with the heating fluid, it is preferable to keep the cross-sectional area of ​​the main body outer space MS approximately the same over the entire length of the lining material 10.

[0097] The present invention is not limited to the embodiments and modifications described above, and various modifications can be made within the scope of the claims. For example, although the lining material 10 in this embodiment is sleeve-shaped, it may be sheet-shaped. Furthermore, although the lining material 10 in this embodiment is an integrated lining material consisting of two sleeve-shaped lining materials, the base hose 100 and the calibration hose 110, the base hose 100 may be omitted and the calibration hose 110 may be thicker. Furthermore, the outer film layer 102 of the base hose 100 and the extension layer 112 of the calibration hose 110 are not necessarily required. Furthermore, the lining material 10 in this embodiment can be used not only for repairing existing pipes, but also for forming a smooth inner surface of newly constructed pipes.

[0098] Furthermore, even if a constituent element is included only in the description of the embodiment or the description of the modified example described above, that constituent element may be applied to the embodiment or other modified example.

[0099] The above-described intermediate body on the inner circumference side of the pipeline is In a pipeline inner periphery side intermediate body used in a pipeline lining method in which the inner periphery of a pipeline buried underground is lined with a fluid, a volume reducing member disposed inside the inner circumferential surface; a lining material that is disposed between the volume reducing member and the inner circumferential surface and that is impregnated with an uncured curable resin; the volume reducing member has a main body portion that is disposed at a position spaced apart from the lining material while the lining material is pressed against the inner circumferential surface, the lining material is pressed against the inner circumferential surface by contact with the fluid supplied into the gap, thereby lining the inner circumferential surface; The main body is elongated in the direction of extension of the pipeline, and is characterized in that while the lining material is pressed against the inner surface, it is filled with fluid and expanded, with both ends in the longitudinal direction being closed.

[0100] Also, It is used in the pipeline lining method, which uses fluid to line the inner surface of underground pipelines. In the intermediate body on the inner periphery of the pipeline, a volume reducing member disposed inside the inner circumferential surface; The volume reducing member is disposed between the inner circumferential surface and the hardening resin impregnated therein is hardened. and a lining material in a state The volume reducing member is configured to reduce the volume of the lining material while the lining material is pressed against the inner circumferential surface. The device has a main body that is disposed at a position spaced apart from the protective material, The lining material is pressed against the inner circumferential surface by contact with the fluid supplied to the gap. The inner peripheral surface may be lined by a threaded fastener.

[0101] The lining material is impregnated with a curable resin such as a thermosetting resin or a photocurable resin. When the lining material is impregnated with a thermosetting resin, it is necessary to press the lining material against the inner peripheral wall using a heated fluid. When the lining material is impregnated with a photocurable resin, it is necessary to press the lining material against the inner peripheral wall using a fluid at room temperature.

[0102] Therefore, energy is generated to supply the fluid, and the larger the diameter of the pipeline, the more the cost of this energy cannot be ignored.

[0103] According to the above-mentioned pipeline inner side intermediate body, by providing the volume reduction member, the volume of the gap is smaller than the volume of the pipeline, reducing the amount of fluid supplied and suppressing the energy cost for generating the fluid.

[0104] When a thermosetting resin is impregnated, it is necessary to continue supplying a heated fluid until curing is complete. When a photocurable resin is impregnated, heat is generated by the photocuring reaction, so it is necessary to continue supplying a cooling fluid until curing is complete. This increases energy costs, and the present invention is therefore suitable. In other words, the present invention is suitable when the pipeline lining method involves a continuous supply of fluid when lining the inner surface of a pipeline buried underground.

[0105] The curable resin may be a photocurable resin or a thermosetting resin.

[0106] The fluid may be a gas (steam or heated air), a liquid (hot water), or a mist. The fluid may also be a pressurizing fluid (compressed fluid), a heating fluid, or a cooling fluid.

[0107] The volume reducing member preferably reduces the volume of the pipeline by 30% or more, more preferably by 50% or more. For example, the main body preferably reduces the volume of the pipeline by 30% or more, more preferably by 50% or more.

[0108] Both the volume reducing member and the lining material may be elongated and disposed along the length of the pipeline, for example, along the entire length or nearly the entire length of the pipeline, although they may also be disposed along only a portion of the entire length of the pipeline.

[0109] The main body may be bendable in the longitudinal direction.

[0110] Further, in the intermediate body on the inner circumference side of the pipeline, The volume reducing member may be characterized in that it has a spacing maintaining portion that contacts the lining material and maintains a spacing between the main body portion and the lining material while the lining material is pressed against the inner circumferential surface.

[0111] The spacing member may be fixed to the main body. That is, the spacing member may be a separate member from the main body. Furthermore, the spacing member may be fixed over the entire length of the main body, or may be fixed to a portion of the main body.

[0112] The spacing portion may be a hanging member that hangs the main body portion.

[0113] The spacing portion may be a rigid body.

[0114] The gap retaining portion may be a fluid supplying member that supplies a fluid to the gap to press the lining material against the inner circumferential surface. Furthermore, the lining material may be impregnated with a thermosetting resin, and the fluid supplying member may supply a heated fluid to the gap.

[0115] Further, in the intermediate body on the inner circumference side of the pipeline, The spacing portions may be arranged evenly in the circumferential direction of the main body portion.

[0116] That is, the spacing retaining portions are provided in multiple locations, and may be arranged at three locations around the circumferential direction of the main body portion, or may be arranged at four or more locations.

[0117] The spacing portion may be fixed to the outer peripheral surface of the main body portion. Furthermore, the spacing portion may be fixed to the outer peripheral surface of the main body portion over the entire length of the spacing portion, or over only a portion of the entire length of the spacing portion.

[0118] Further, in the intermediate body on the inner circumference side of the pipeline, The main body may be filled with a fluid and expand.

[0119] Furthermore, in the intermediate body on the inner periphery of the pipeline, The main body is filled with air and inflated while the lining material is pressed against the inner circumferential surface, and both ends of the main body are closed in the longitudinal direction, The lining material may be impregnated with a thermosetting resin, and when heated fluid supplied into the gap comes into contact with the lining material and the lining material is pressed against the inner circumferential surface, the thermosetting resin hardens and lines the inner circumferential surface.

[0120] The main body may be a bag-shaped or cylindrical body that expands when a fluid is filled inside, or may have a double-cylinder structure in which a fluid is filled between an inner cylinder and an outer cylinder, or may have a shape in which a plurality of cylindrical (bag-shaped) bodies extending in the extension direction of the conduit are arranged circumferentially and have a hollow center.

[0121] The fluid supply member may be a cylindrical or bag-shaped member having a supply port provided therein, and may supply the fluid from the supply port to the gap in a state in which the member is inflated with the fluid to be supplied.

[0122] The spacing portion may have a spacing internal space connected to a main body internal space of the main body portion, and may be expanded when the spacing internal space is filled with a fluid.

[0123] The above-described pipeline lining method is as follows: a drawing step of drawing the pipeline inner periphery side intermediate body into a pipeline buried underground; and a lining step of supplying a fluid into the gap to press the lining material against the inner circumferential surface and line the inner circumferential surface with the lining material.

[0124] moreover, a drawing step of drawing the pipeline inner periphery side intermediate body into a pipeline buried underground; a fluid supplying step of supplying a fluid into the main body and terminating the supply of the fluid when the main body expands; The method may further include a lining step of supplying a fluid into the gap to press the lining material against the inner circumferential surface and line the inner circumferential surface with the lining material.

[0125] According to the above-described pipeline lining method, the amount of fluid supplied to the gap in the lining step is reduced, and the cost of energy for generating the fluid is reduced.

[0126] In addition, in the above-mentioned pipeline lining method, The lining step may be characterized by continuing to supply a fluid to the gap.

[0127] In addition, when the fluid is continuously supplied, the fluid may be circulated. [Explanation of symbols]

[0128] 1 Intermediate body on the inner circumferential side of the conduit 10 Lining material 100 Base Hose 110 Calibration Hose 20 Volume reduction components 21 Main body 22 Support part MS body outer space K conduit

Claims

1. a drawing step of drawing an intermediate body on the inner periphery of the pipeline, which is provided with a lining material impregnated with an uncured thermosetting resin, into a pipeline buried underground; a lining step of supplying a heated fluid to the inside of the lining material, pressing the lining material against the inner circumferential surface of the pipeline, and curing the thermosetting resin; A pipeline lining method characterized in that the lining step is a step of supplying a heated fluid at a temperature higher than the temperature of the heated fluid that had been supplied up to that point after the hardening heat of the thermosetting resin has occurred.

2. the drawing step is a step of drawing the pipeline inner peripheral side intermediate body, which includes a volume reducing member having a main body portion extending in an extension direction of the pipeline, into the inside of the lining material, 2. The pipeline lining method according to claim 1, wherein the lining step is a step of supplying a heated fluid between the main body and the lining material.

3. the retracting step is a step of retracting the pipeline inner peripheral side intermediate body including the volume reducing member having the main body portion that expands when filled with fluid, The method further includes a volume reduction step of filling a fluid into the main body of the pipeline inner circumferential side intermediate body drawn into the pipeline to expand the main body, 3. The pipeline lining method according to claim 2, wherein the lining step is a step of supplying a heated fluid between the expanded main body and the lining material.

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