Inner circumferential side intermediate body of pipeline and pipeline lining method

Abstract

To provide a pipeline inner peripheral side intermediate and a pipeline lining method that suppress a cost of energy for supplying fluid, in relation to the pipeline inner peripheral side intermediate used in the pipeline lining method that uses fluid to line an inner surface of a pipeline buried underground.SOLUTION: A pipeline inner peripheral side intermediate includes: a volume reducing member 20 arranged inside an inner peripheral surface K3 of a pipeline K buried underground; and a lining material 10 arranged between the volume reducing member 20 and the inner peripheral surface K3, in which an impregnated curable resin is in an uncured state. The volume reducing member 20 has a body part 21 arranged at a position spaced apart from the lining material 10 by a gap MS while the lining material 10 is pressed against the inner peripheral surface K3. The lining material 10 lines the inner peripheral surface K3 by being pressed against the inner peripheral surface K3 by being in contact with a fluid supplied to the gap MS.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an intermediate body on the inner peripheral side of a pipeline used in a pipeline lining method for backing the inner peripheral surface of a pipeline buried in the ground with a fluid, and a pipeline lining method for backing the inner peripheral surface of a pipeline buried in the ground using the intermediate body on the inner peripheral side of the pipeline.

Background Art

[0002] Some pipelines such as buried sewer pipes are damaged due to aging, ground subsidence, or fluctuations in ground pressure. When repairing a damaged existing pipe, it is preferable to perform the repair without excavation from the viewpoints of reducing repair costs and minimizing traffic disruptions.

[0003] Therefore, as a non-excavation repair method for existing pipes, various techniques have been proposed for pressing a lining material against the inner peripheral wall of an existing pipe and backing the inner peripheral wall with the lining material (see, for example, Patent Document 1 and Patent Document 2, etc.). Also, even when newly laying a pipeline, the inner peripheral wall of the newly installed pipe may be backed with a lining material.

[0004] The lining material is impregnated with a curable resin such as a thermosetting resin or a photocurable resin. When impregnated with a thermosetting resin, it is necessary to press the lining material against the inner peripheral wall with a heated fluid. When impregnated with a photocurable resin, it is necessary to press the lining material against the inner peripheral wall with a fluid at room temperature.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, energy is generated to supply the fluid, and as the diameter of the pipeline increases, the cost of that energy becomes non-negligible.

[0007] In view of the above circumstances, the present invention provides an intermediate member on the inner peripheral side of a pipeline that can suppress the cost of energy for supplying a fluid, and a pipeline lining method for lining the inner peripheral surface of a pipeline buried in the ground using the intermediate member on the inner peripheral side of the pipeline.

Means for Solving the Problems

[0008] The intermediate member on the inner peripheral side of the pipeline of the present invention for solving the above object is In a pipe inner peripheral side intermediate body used in a pipe lining method for backing the inner peripheral surface of a pipe buried in the ground using a fluid, a volume reduction member disposed inside the inner peripheral surface; a lining material disposed between the volume reduction member and the inner peripheral surface and impregnated with an uncured curable resin; the volume reduction member has a main body portion disposed at a position spaced apart from the lining material while the lining material is pressed against the inner peripheral surface; the lining material is pressed against the inner peripheral surface by contact with a fluid supplied to the space to line the inner peripheral surface; the main body portion is elongated in the extending direction of the pipe, and is filled with fluid and inflated with both longitudinal ends closed while the lining material is pressed against the inner peripheral surface. Also, In the intermediate member on the inner peripheral side of the pipeline used in the pipeline lining method for lining the inner peripheral surface of a pipeline buried in the ground using a fluid, a volume reduction member disposed inside the inner peripheral surface; a lining material disposed between the volume reduction member and the inner peripheral surface and impregnated with a curable resin in an uncured state; the volume reduction member has a main body portion disposed at a position spaced apart from the lining material while the lining material is pressed against the inner peripheral surface; the lining material is pressed against the inner peripheral surface by contact with the fluid supplied to the space to line the inner peripheral surface, which is characterized in that it may be.

[0009] According to the intermediate member on the inner peripheral side of the pipeline of the present invention, by providing the volume reduction member, the volume of the space is smaller than the volume of the pipeline, the supply amount of the fluid is reduced, and the cost of energy for generating the fluid is suppressed.

[0010] In addition, when impregnated with a thermosetting resin, it is necessary to continuously supply a heated fluid until the curing is completed. When impregnated with a photocurable resin, since heat is generated by the photocuring reaction, it is necessary to continuously supply a cooling fluid until the curing is completed. Therefore, the energy cost will increase more, and the invention is suitable. That is, the present invention is suitable when the pipeline lining method is a method of continuously supplying a fluid when lining the inner peripheral surface of a pipeline buried underground.

[0011] The curable resin may be a photocurable resin or a thermosetting resin.

[0012] The fluid may be a gas (vapor or heated air), a liquid (warm water), or in the form of a mist. Further, the fluid may be a pressurizing fluid (compressed fluid), a heating fluid, or a cooling fluid.

[0013] The volume reduction member preferably reduces 30% or more of the volume of the pipeline, and more preferably reduces 50% or more. For example, the main body preferably reduces 30% or more of the volume of the pipeline, and more preferably reduces 50% or more.

[0014] The volume reduction member and the lining material may also be long objects arranged along the extending direction of the pipeline. For example, they may be arranged along the entire length or substantially the entire length of the pipeline. However, they may also be arranged only on a part of the entire length of the pipeline.

[0015] The main body may be bendable in the longitudinal direction.

[0016] Also, in the above pipeline inner peripheral side intermediate body, The volume reduction member may be characterized in that it has a spacing holding portion that keeps the body portion spaced apart from the lining material while the lining material is pressed against the inner peripheral surface.

[0017] Note that the spacing holding portion may be fixed to the body portion. That is, the spacing holding portion may be a member separate from the body portion. Further, the spacing holding portion may be fixed over the entire length of the body portion, or may be fixed to a part of the body portion.

[0018] The spacing holding portion may be a suspension member that suspends the body portion.

[0019] The spacing holding portion may be a rigid body.

[0020] The spacing holding portion may be a fluid supply member that supplies a fluid for pressing the lining material against the inner peripheral surface into the space. Further, the lining material may be impregnated with a thermosetting resin, and the fluid supply member may supply a heated fluid into the space.

[0021] Also, in the intermediate member on the inner peripheral side of the pipeline, The spacing holding portion may be characterized in that it is evenly arranged in the circumferential direction of the body portion.

[0022] That is, a plurality of spacing holding portions may be provided, and they may be arranged at three locations in the circumferential direction of the body portion, or may be arranged at four or more locations.

[0023] The spacing holding portion may be fixed to the outer peripheral surface of the body portion. Further, the spacing holding portion may be fixed to the outer peripheral surface of the body portion over the entire length of the spacing holding portion, or only a part of the entire length of the spacing holding portion may be fixed.

[0024] Also, in the intermediate member on the inner peripheral side of the pipeline, the main body portion may be characterized in that it is filled with a fluid inside and swells. Furthermore, in the above pipe inner peripheral side intermediate body, the main body portion is filled with air and inflated with both longitudinal ends closed while the lining material is pressed against the inner peripheral surface; the lining material may be impregnated with a thermosetting resin and the thermosetting resin is cured by contact with a heated fluid supplied to the space to line the inner peripheral surface while being pressed against the inner peripheral surface.

[0025] Note that the main body portion may be one in which a fluid is filled and swells inside a bag shape or a cylindrical shape, or may be one in which a fluid is filled and swells between an inner cylinder and an outer cylinder in a double cylinder structure. Further, a plurality of cylindrical (bag-shaped) members extending in the extending direction of the pipeline may be arranged in the circumferential direction and the central portion may have a hollow shape.

[0026] The fluid supply member may be one provided with a supply port in a cylindrical or bag-shaped member, and may supply fluid from the supply port to the interval in a swollen state by the fluid to be supplied.

[0027] The interval holding portion may have an interval holding internal space connected to the internal space of the main body of the main body portion, and a fluid may be filled and swollen in the interval holding internal space.

[0028] The pipeline lining method of the present invention for solving the above object is a drawing step of drawing the intermediate member on the inner peripheral side of the pipeline into a pipeline buried in the ground, and a lining step of supplying a fluid to the interval, pressing the lining material against the inner peripheral surface, and lining the inner peripheral surface with the lining material. Furthermore, a drawing-in step of drawing the above pipe inner peripheral side intermediate body into a pipe buried in the ground; a fluid supply step of supplying fluid into the main body portion and ending the supply of the fluid when the main body portion expands; a lining step of supplying fluid to the space to press the lining material against the inner peripheral surface and lining the inner peripheral surface with the lining material.

[0029] According to the pipeline lining method of the present invention, in the lining step, the supply amount of the fluid supplied to the interval is reduced, and the energy cost for generating the fluid is suppressed.

[0030] Also, in the above pipeline lining method, the lining step may be characterized in that it is a step of continuously supplying a fluid to the interval.

[0031] In continuously supplying the fluid, the fluid may be circulated.

Advantages of the Invention

[0032] According to the present invention, it is possible to provide an intermediate body on the inner peripheral side of a pipeline that can suppress the cost of energy for supplying a fluid, and a pipeline lining method for lining the inner peripheral surface of a pipeline buried in the ground using the intermediate body on the inner peripheral side of the pipeline.

Brief Description of the Drawings

[0033]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Best Mode for Carrying Out the Invention

[0034] Embodiments of the present invention will be described with reference to the following drawings.

[0035] FIG. 1(A) is a perspective view showing an embodiment of a lining material.

[0036] The lining material 10 shown in FIG. 1(A) is a sleeve-shaped one used when lining the inner peripheral wall of a sewer pipe buried in the ground. However, in FIG. 1(A), the sleeve-shaped lining material 10 is shown in a flattened state. This lining material 10 is an integrated one formed by two sleeve-shaped lining materials, namely a base hose 100 and a calibration hose 110. Hereinafter, the radially outer side of the lining material 10 will simply be referred to as the outer side, and the radially inner side will simply be referred to as the inner side. The base hose 100 is located outside the calibration hose 110. The calibration hose 110 is thinner than the base hose 100.

[0037] The base hose 100 has a base material layer 101 and an outer film layer 102. The base material layer 101 shown in FIG. 1(A) is a non-woven fabric of polyester. Note that this base material layer 101 is not limited to polyester, and may be a non-woven fabric made of an organic fiber material such as nylon, acrylic, or vinylon, or a woven fabric made of such an organic fiber material, or a non-woven fabric or a woven fabric made of an inorganic fiber material such as carbon fiber or glass fiber, and furthermore, it may be a combination of an organic fiber material and an inorganic fiber material.

[0038] The base layer 101 shown in Fig. 1(A) is impregnated with a compound. The compound impregnating the base layer 101 is mainly composed of a vinyl ester (epoxy acrylate) resin. Note that instead of the vinyl ester resin, an unsaturated polyester resin, a urethane acrylate resin, or the like may be used. Vinyl ester is a type of thermosetting resin that is crosslinked by a radical polymerizable monomer. The compound contains a crosslinking agent, a viscosity modifier, a filler, a curing agent (such as a peroxide), various additives, and the like.

[0039] The outer film layer 102 covers the base layer 101 from the outside and has a function of suppressing the leakage of the compound impregnated in the base layer 101 to the outside. That is, the outer film layer 102 is waterproof. 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 instead of polyethylene, other polyolefins such as polypropylene may be used, and furthermore, it may have a single-layer structure instead of a laminated structure.

[0040] The calibration hose 110 has a base layer 111 and an extension layer 112. The base layer 111 of the calibration hose 110 shown in Fig. 1(A) is also a polyester non-woven fabric, similar to the base layer 101 of the base hose 100. Note that this base layer 111 is not limited to polyester, and may be a non-woven fabric made of an organic fibrous material such as nylon, acrylic, or vinylon, or a woven fabric made of such an organic fibrous material, or a non-woven fabric or a woven fabric made of an inorganic fibrous material such as carbon fiber or glass fiber, and furthermore, it may be a combination of an organic fibrous material and an inorganic fibrous material.

[0041] The base material layer 111 of the calibration hose 110 shown in Fig. 1(A) is also impregnated with a compound. The compound used for the calibration hose 110 is also mainly composed of a curable resin. As the curable resin here, a thermosetting resin selected from unsaturated polyester, epoxy (meth)acrylate, urethane (meth)acrylate, and unsaturated polyester acrylate can be used. This compound also contains a crosslinking agent, a viscosity modifier, a filler, a curing agent (such as peroxide), various additives, and the like.

[0042] The extension layer 112 is made of polyurethane that forms the innermost circumferential surface of this lining material 10 and has excellent extensibility. That is, it has better extensibility than the outer film layer 102 of the base hose 100.

[0043] 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.

[0044] First, prepare an appropriate material suitable for the pipeline to be lined. The materials prepared here include a base hose 100 not impregnated with a compound and a calibration hose 110 also not impregnated with a compound. These hoses (100, 110) are in the form of sleeves cut to a length corresponding to the length of the pipeline to be lined and are prepared separately. The base hose 100 prepared here has the outer film layer 102 on the outside and the base material layer 101 inside the outer film layer 102. On the other hand, for the calibration hose 110, the extension layer 112 is on the outside and the base material layer 111 is inside the extension layer 112. That is, it is in a state opposite to that of the calibration hose 110 shown in Fig. 1(A).

[0045] Also, a base hose main agent, a filler, a curing agent (such as peroxide), and various additives that serve as the basis for the compound to be impregnated into the base hose 100 are also prepared. The base hose main agent prepared here is mainly composed of vinyl ester, which is a thermosetting resin (50% by weight or more). The compound also contains a crosslinking agent and a viscosity modifier. Furthermore, the base hose main agent also contains silica as a thixotropic agent, cobalt naphthenate as a curing accelerator, and a polymerization inhibitor, etc.

[0046] Also, a calibration hose main agent, a filler, a curing agent, and various additives that serve as the basis for the compound to be impregnated into the calibration hose 110 are also prepared. The calibration hose main agent is also mainly composed of a thermosetting resin. The compound for the calibration hose also contains a crosslinking agent and methacrylic acid ester as a viscosity modifier.

[0047] Next, resin mixing is performed. Here, the base hose main agent, the filler, the curing agent, and various additives are mixed to prepare the base hose compound. Also, the calibration hose main agent, the filler, the curing agent, and various additives are mixed to prepare the calibration hose compound.

[0048] Subsequently, the base hose 100's base material layer 101 is impregnated with the adjusted base hose compound. Also, the calibration hose 110's base material layer 111 is impregnated with the adjusted calibration hose compound. The base material layer 101 of the base hose 100 is impregnated with the compound to saturation, and the base material layer 111 of the calibration hose 110 is impregnated with the compound to supersaturation. That is, the impregnation rate of the compound is made higher for the base material layer 111 of the calibration hose 110 than for the base material layer 101 of the base hose 100. Thus, the base hose 100 impregnated with the compound and the calibration hose 110 with the compound-impregnated base material layer 111 located inside are prepared separately. Note that the base material layer 101 of the base hose 100 may be impregnated with the compound to supersaturation and the base material layer 111 of the calibration hose 110 may be impregnated with the compound to saturation.

[0049] Next, the calibration hose 110 is reversely inserted inside the base hose 100 impregnated with the compound. In the reverse insertion, the calibration hose 110 with the base material layer 111 located inside is turned inside out so that the base material layer 111 comes to the outside, and then the calibration hose 110 is inserted inside the base hose 100. The calibration hose 110 is inserted inside the base hose 100 from one end side of the base hose 100 and is reversely inserted by the force of air or water. Since the calibration hose 110 is thinner than the base hose 100, the reverse insertion is easily performed. By reversely 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, which is an integrated structure of the two sleeve-shaped lining materials, the base hose 100 and the calibration hose 110 shown in FIG. 1, is completed. As shown in FIG. 1, the outermost surface of the lining material 10 is constituted by the outer film layer 102 and its innermost surface is constituted by the extension layer 112, and between the outer film layer 102 and the extension layer 112, the base material layers 101, 111 impregnated with the thermosetting resin are arranged.

[0050] Furthermore, a volume reduction member is inserted inside the lining material 10.

[0051] FIG. 1(B) is a diagram showing the state before inserting the volume reduction member inside the lining material, and FIG. 1(C) is a diagram showing the state where the insertion of the volume reduction member inside the lining material is completed.

[0052] Details of the configuration of the volume reduction member 20 will be described later. It has a cylindrical main body portion 21 and three support portions 22 evenly arranged in the circumferential direction of the main body portion 21. In FIGS. 1(B) and 1(C), only two support portions 22 are shown, but the support portions 22 are fixed around the main body portion 21 at 120-degree intervals. Each support portion 22 is cylindrical with a smaller diameter than the main body portion 21, but the right end in the figure is closed. Note that the right end of each support portion 22 may be closed at the construction site.

[0053] As shown in FIG. 1(B), the tip of the volume reduction member 20 is tied with a string-like body R such as a rope, and by winding up the string-like body R, the volume reduction member 20 is completely drawn into the lining material 10 from the one-end opening 10a of the lining material 10.

[0054] In FIG. 1(C), the portion of the volume reduction member 20 housed inside the lining material 10 is indicated by a dotted line. The main body portion 21 is longer than the lining material 10, and both ends protrude from the lining material 10 respectively. On the other hand, the support portion 22 is shorter than the lining material 10, the closed right end in the figure is inside the lining material 10, and the left end is at the same position as the end of the lining material 10. The lining material 10 with the volume reduction member 20 inserted inside it becomes the intermediate body 1 on the inner peripheral side of the pipeline. Therefore, FIG. 1(C) is a diagram showing the completed intermediate body 1 on the inner peripheral side of the pipeline.

[0055] Finally, the completed inner circumferential intermediate body 1 of the pipeline is flattened, pleated, and stored at a low temperature in a folded state. Note that the completed inner circumferential intermediate body 1 of the pipeline may also be stored at a low temperature in a wound state. The inner circumferential intermediate body 1 of the pipeline stored at a low temperature is transported to the construction site by a cold storage vehicle while remaining in a folded state.

[0056] Next, the pipeline lining method at the construction site will be described.

[0057] FIG. 2 is a flowchart showing the process of lining a pipeline using the inner circumferential intermediate body of the pipeline shown in FIG. 1 at the construction site.

[0058] First, construction preparation is carried out at the construction site (step S1), and then, the pipeline is cleaned and the pipeline is inspected using a TV camera running inside the pipeline (step S2). By this inspection, damage locations in the pipeline are confirmed, etc.

[0059] Subsequently, the inner circumferential intermediate body 1 of the pipeline is drawn into the pipeline (step S3).

[0060] FIG. 3 is a schematic diagram showing the state of drawing the inner circumferential intermediate body of the pipeline into the pipeline.

[0061] The pipeline K to be lined is a concrete one for flowing sewage, which is provided between manholes M1 and M2 and buried underground, but can be accessed from the 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 is lined with the lining material 10 shown in FIG. 1(A) over the entire length of the pipeline (between manhole M1 and manhole M2). Note that in FIG. 3, the total length of the pipeline K is shown much shorter than the actual length.

[0062] The intermediate body 1 on the inner periphery of the pipeline that has been transported by the cold storage vehicle CC is drawn into the pipeline K through the manhole M1 from the cold storage vehicle CC. First, stop the cold storage vehicle CC near the entrance M11 of one of the manholes (hereinafter referred to as the starting-side manhole M1) connected to the pipeline K to be lined. Install a winch W near the entrance M21 of the other manhole (hereinafter referred to as the arrival-side manhole M2) connected to the pipeline K to be lined. Subsequently, insert the rear end of the pulling wire Y1 wound around the winch W through the pulley P into the arrival-side manhole M2, and penetrate the pulling wire Y1 to the starting-side manhole M1.

[0063] Tie the leading part of the intermediate body 1 on the inner periphery of the pipeline with a binding wire Y2, and connect the binding wire Y2 and the rear end of the pulling wire Y1 that has penetrated to the starting-side manhole M1 inside the starting-side manhole M1. Use the winch W installed near the entrance M21 of the arrival-side manhole M2 to wind up the pulling wire Y1, and draw the intermediate body 1 on the inner periphery of the pipeline into the pipeline from the connection part (entrance K1) of the pipeline K to be lined with the starting-side manhole M1. Both the lining material 10 and the volume reduction member 20 that make up the intermediate body 1 on the inner periphery of the pipeline are soft and can be easily bent in the longitudinal direction. Therefore, when being drawn into the pipeline, it is drawn into the pipeline while bending at the entrance M11 of the starting-side manhole M1 and the entrance K1 of the pipeline K. Stop the winch W and complete the drawing when the leading part of the intermediate body 1 on the inner periphery of the pipeline tied with the binding wire Y2 exits from the connection part (exit K2) of the pipeline K to be lined with the arrival-side manhole M2. The step S3 described above corresponds to an example of the drawing process of the present invention.

[0064] Next, the inner peripheral side intermediate body 1 of the pipeline is set inside the pipeline (step S4). First, the bundling wire Y2 is removed from the inner peripheral side intermediate body 1 of the pipeline. The end portion on the reaching side of the lining material 10 has come out from the outlet K2 of the pipeline K, and the end portions on the reaching side of the volume reduction member 20 (the end portions on the reaching side of the main body portion 21 and the support portion 22 respectively) have also come out from the outlet K2. On the other hand, the end portion on the starting side of the lining material 10 has not been drawn into the pipeline and remains in front of the inlet K1, and the end portions on the starting side of the volume reduction member 20 (the end portions on the starting side of the main body portion 21 and the support portion 22 respectively) have not been drawn into the pipeline and remain in front of the inlet K1.

[0065] Also, in step S4, the reaching side plug member 31 is fitted into the opening end portion on the reaching side (the outlet K2 side) of the inner peripheral side intermediate body 1 of the pipeline (see Fig. 5). The reaching side plug member 31 is a donut-shaped rigid body provided with a through hole through which the main body portion 21 passes in the central portion. The opening end portion on the reaching side (the outlet K2 side) of the lining material 10 is applied with the reaching side plug member 31 from the inner peripheral side and tightened with a tightening member 33 from the outer peripheral side (see Fig. 5). As a result, in a state where the lining material 10, the reaching side plug member 31, and the main body portion 21 are located in this order from the outside, the reaching side (the outlet K2 side) between the main body portion 21 and the lining material 10 is sealed. Also, the end portion on the reaching side (the end portion on the outlet K2 side) of the main body portion 21 is crushed to close the opening on the reaching side and tied with a band 21B (see the right side of Fig. 5). Note that the opening on the reaching side of the main body portion 21 may be tied with a band 21B before the inner peripheral side intermediate body 1 of the pipeline is drawn into the pipeline. For example, at the factory, it may be tied before or after inserting the volume reduction member 20 inside the lining material 10, or when tying the leading portion of the inner peripheral side intermediate body 1 of the pipeline with the bundling wire Y2.

[0066] Furthermore, a starting-side plug member 32 is fitted into the opening end portion on the starting side (the inlet K1 side) of the inner peripheral side intermediate body 1 of the pipeline, and it is tightened with a tightening member 34 from the outer peripheral side of the lining material 10 (see Fig. 5). As a result, the starting side (the inlet K1 side) between the main body portion 21 and the lining material 10 is also sealed, and the starting side (the inlet K1 side) of the main body portion 21 is also sealed. A compressed air supply port 321 for supplying compressed air to the main body portion 21 is provided in the central portion of the starting-side plug member 32, and heating air supply ports 322 for supplying heating air to the support portion 22 are provided at intervals of 120 degrees around it (see Fig. 5). Note that only one heating air supply port 322 is shown in Fig. 5.

[0067] In addition, in step S4, a compressor 36 and a mixing device 37 are installed near the inlet M11 of the starting-side manhole M1 (see Fig. 5). A supply hose SH extends from the mixing device 37. The supply hose SH is branched, and one of the branched hoses is connected to the compressed air supply port 321 of the starting-side plug member 32, and the other is connected to the heating air supply port 322. A main body portion valve SH1 is provided in the portion of the supply hose SH that is branched and connected to the compressed air supply port 321, and a support portion valve SH2 is provided in the portion that is branched and connected to the heating air supply port 322 (see Fig. 5).

[0068] When the above preparations are complete, with the main body portion valve SH1 open, the compressor 36 is operated to start supplying compressed air to the main body portion 21 via the mixing device 37. The temperature of the compressed air here is normal temperature or low temperature. The temperature of the compressed air needs to be suppressed to a temperature at which the thermosetting of the thermosetting resin impregnated in the lining material 10 does not start. The supply of compressed air is continued until the main body portion 21 is sufficiently inflated and becomes cylindrical. When the main body portion 21 is sufficiently inflated, the main body portion valve SH1 is closed and the supply of compressed air is terminated.

[0069] Next, in step S5 shown in Fig. 2, the diameter of the lining material 10 is expanded, and in the subsequent step S6, the supply of the heating fluid is continued.

[0070] FIG. 4 is a cross-sectional view showing the state in which the lining material is expanded in step S5 shown in FIG. 2. This cross-sectional view is a view when the cross-section is taken in a direction orthogonal to the extending direction of the pipeline K. FIG. 5 is a schematic cross-sectional view showing the state in which the supply of the heating fluid is continued in step S6 shown in FIG. 2. The cross-sectional view of FIG. 5 is a view when the cross-section is taken along the extending direction of the pipeline K, and the left-right direction in the figure is the extending direction of the pipeline K. Also in this FIG. 5, as in FIG. 3, the entire length of the pipeline K is shown to be considerably shorter than the actual length. Further, the thickness of the lining material 10 is shown to be considerably thicker than the actual thickness.

[0071] In FIG. 5, near the entrance M11 of the starting-side manhole M1, a boiler vehicle BC parked in place of the cold-insulation vehicle CC shown in FIG. 3 is shown. The mixing device 37 is supplied with steam from the boiler 35 loaded on the boiler vehicle BC and compressed air from the compressor 36. A steam valve 351 is provided in the pipe connecting the boiler 35 and the mixing device 37, and a compressed air valve 361 is provided in the pipe connecting the compressor 36 and the mixing device 37. By operating the opening and closing of these valves (351, 361), the temperature of the gas supplied to the inner peripheral side intermediate body 1 of the pipeline can be adjusted, or the flow rate of the gas can be adjusted.

[0072] Further, in the starting-side plug member 32 shown in FIG. 5, the starting-side opening of the main body portion 21 is fixed, and the starting-side openings of the respective support portions 22 are also fixed.

[0073] Furthermore, the starting-side plug member 32 is also provided with a fluid discharge port 323 at the 6 o'clock position. Also, an exhaust device 38 is installed near the entrance M11 of the starting-side manhole M1. This exhaust device 38 has a silencing portion 381 and an exhaust duct 382. The fluid discharge port 323 and the silencing portion 381 are connected by a recovery hose CH.

[0074] In the diameter expansion of the lining material 10 in step S5, compressed air at about 80°C is used. Hereinafter, the compressed air at a temperature of about 80°C or higher may be simply referred to as heated air. The heated air is obtained by mixing steam at 100°C or higher heated by the boiler 35 shown in FIG. 5 and compressed air from the compressor 36 in the mixing device 37, and is supplied through the supply hose SH. The main body valve SH1 closed at the end of step S4 remains closed, and the support valve SH2 is opened to supply heated air to each support portion 22. The support portion 22 is a cylindrical body with the end on the reaching side (exit K2 side) closed, and the reaching side is shorter than the main body portion 21 and extends only up to in front of the reaching side plug member 31. However, the end on the starting side of the support portion 22 extends to a position beyond the exit K2 of the pipeline K. Note that the end on the reaching side of the lining material 10 also extends to a position beyond the exit K2 of the pipeline K. The support portion 22 is continuously fixed to the main body portion 21 over the entire length, but it may be fixed intermittently. Further, the support portion 22 is provided with round holes 222 having a diameter of about 1 cm at intervals of 1 m from the starting side (entrance K1 side) toward the reaching side (exit K2 side), and slit holes 221 are provided at the tips thereof. The slit holes 221 are, for example, several cm in width and about 10 cm to 20 cm in length, but in FIG. 5, they are shown relatively large together with the round holes 222. As shown in FIG. 5, the round holes 222 and the slit holes 221 are arranged in a row in the extending direction of the pipeline K, and the round holes 222 and the slit holes 221 are also arranged in a row in the extending direction of the pipeline K on the 180-degree opposite side in the circumferential direction of the support portion 22. The amount of heated air supplied through the supply hose SH is larger than the amount of heated air blown out from the round holes 222 and the slit holes 221, and the support portion 22 bulges into a cylindrical shape.

[0075] Figure 4 shows a main body portion 21 that bulges in a cylindrical shape and support portions 22 that bulge in a cylindrical shape at three locations in the circumferential direction of the main body portion 21. When the support portions 22 bulge in a cylindrical shape, each support portion 22 contacts the inner peripheral wall K3 of the pipeline K with the lining material 10 sandwiched therebetween. The support portion 22 corresponds to an example of a space holding portion that keeps the cylindrical main body portion 21 at a distance from the lining material 10. Hereinafter, the space in this interval is referred to as the outer space MS of the main body portion. In the pipeline inner peripheral side intermediate body 1 shown in Figure 4, the support portions 22 contact the inner peripheral wall K3 of the pipeline K with the lining material 10 sandwiched therebetween at the 12 o'clock position, the 4 o'clock position, and the 8 o'clock position, respectively. In this way, by having the support portions 22 contact the inner peripheral wall K3 of the pipeline K with the lining material 10 sandwiched therebetween at three locations evenly arranged in the circumferential direction, the central position of the cylindrical main body portion 21 substantially coincides with the central position of the pipeline K, and the main body portion 21 is stably supported within the pipeline K. Also, the rotation of the entire volume reduction member 20 around the axis can be suppressed by the support portions 22 contacting the lining material 10. In particular, if the support portions 22 are pressed against the lining material 10, the rotation of the entire volume reduction member 20 can be firmly suppressed. Note that Figure 5 shows only the support portion 22 provided at the 12 o'clock position.

[0076] Note that from the step of supplying the normal temperature compressed air in step S4 to the main body portion 21, the support portion valve SH2 may also be opened and compressed air may be supplied to each support portion 22 to inflate each support portion 22. In step S5, the normal temperature compressed air may be switched to heated air. By doing so, before the inflation of the main body portion 21 is completed, the inflation of each support portion 22 will be completed, and the central position of the cylindrical main body portion 21 will more easily coincide with the central position of the pipeline K. Also, the time to wait until each support portion 22 inflates is reduced, leading to a shortening of the construction period.

[0077] Even if the support part 22 swells cylindrically, if the supply of heated air from the supply hose SH continues, the outer space MS of the main body part will be filled with the heated air blown out from the slit holes 221 and the round holes 222. The volume of the outer space MS of the main body part is narrowed to 2 / 3 or less of the volume of the pipeline K, and the amount of heated air required to fill the outer space MS of the main body part is significantly suppressed. That is, the volume reduction member 20 reduces 1 / 3 or more of the volume of the pipeline K. If the reduction ratio of the volume by the volume reduction member 20 is less than 30%, the effect of reducing the energy cost for supplying heated air will be diminished. To more fully obtain the effect of reducing the energy cost for supplying heated air, it is preferable that the reduction ratio of the volume by the volume reduction member 20 be 50% or more. However, if the volume of the outer space MS of the main body part becomes too small, the heating effect will be diminished this time, so it is also necessary to keep the reduction ratio of the volume by the volume reduction member 20 at 75% or less.

[0078] The heated air supplied to the outer space MS of the main body part on the reaching side (exit K2 side) of the lining material 10 flows through the outer space MS of the main body part toward the fluid discharge port 323 provided in the starting side plug member 32, and its temperature gradually decreases. Then, it is sent from the fluid discharge port 323 through the recovery hose CH to the soundproofing part 381. The soundproofing part 381 has an internal space with a cross-sectional area larger than the cross-sectional area of the recovery hose CH, and a soundproofing material is also arranged therein. The heated air carries sound waves such as the boiling sound of the boiler 35, and an air release sound also occurs. The soundproofing part 381 silences these sounds. The heated air that has passed through the soundproofing part 381 is exhausted into the atmosphere from the exhaust duct 382.

[0079] Also, drain is generated in the outer space MS of the main body part. The reaching side plug member 31 is provided with a drain hole 311. A pipe provided with a valve 3111 is connected to the drain hole 311, and the drain in the outer space MS of the main body part can be drained by opening the valve 3111.

[0080] The heated air blown out from the slit holes 221 and round holes 222 into the outer space MS of the main body portion contacts the extension layer 112 and presses the extension 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 peripheral wall K3 of the pipeline K. When the lining material 10 expands in diameter, the extension layer 112 extends well, and the inner peripheral surface of the lining material 10 formed by the extension layer 112 becomes a smooth surface.

[0081] FIG. 6 is a graph roughly showing an example of changes in the temperature and the like of the compressed air supplied to the outer space of the main body portion. In the graph shown in FIG. 6, the horizontal axis represents time, and the vertical axis represents temperature (°C). Also, the solid line graph roughly represents the temperature of the compressed air supplied to the outer space MS of the main body portion. The temperature here is the set temperature of the mixing device 37. Further, at each of the end on the arrival side (exit K2 side) of the lining material 10 and the end on the exit K2 side, the temperature of the lining material 10 itself is measured. At each end, the temperature at the bottom of the lining material 10 may be measured or the temperature at the top may be measured, but after draining the outer space MS of the main body portion from the drain hole 311, it is preferable to measure the temperature at the bottom. The one-dot chain line graph roughly represents the measured temperature of the end on the arrival side (exit K2 side) of the lining material 10, and the dotted line graph roughly represents the measured temperature of the end on the starting side (entrance K1 side) of the lining material 10. Note that an optical fiber may be installed over the entire length of the lining material 10, and the temperature of the lining material may be measured at a plurality of locations for temperature control.

[0082] The temperature change of the lining material 10 occurs with a delay with respect to the temperature change of the compressed air supplied to the outer space MS of the main body portion. Further, the temperature change at the end on the starting side (entrance K1 side) of the lining material 10 occurs with a delay with respect to the temperature change at the end on the arrival side (exit K2 side) of the lining material 10.

[0083] As described above, in the diameter expansion of the lining material 10 in step S5, compressed air at about 80°C is used. Compressed air at about 80°C blows out from the round hole 222 and the slit hole 221 of the support portion 22 into the outer space MS of the main body portion. When the curable resin cures, heat is generated due to curing, and once the temperature rises, the temperature of the lining material 10 reaches the peak temperature (90°C in the example shown in FIG. 6), and then the temperature starts to decrease. The temperature of the curable resin itself rises to a temperature exceeding 100°C due to its own heat generation during curing. In FIG. 6, the heat-resistant temperature of the extension layer 112 is represented by the graph of the two-dot chain line. The heat-resistant temperature of the extension layer 112 is 120°C, and when the temperature of the curable resin rises to this temperature, the extension layer 112 will melt. If compressed air at a high temperature (even if it does not reach 120°C, for example, compressed air at 100°C) is supplied before heat generation due to curing occurs, the heat generated during curing may be superimposed, and the temperature of the curable resin may reach 120°C. Therefore, until heat generation due to curing occurs, slightly lower compressed air is supplied in anticipation of the heat generated during curing, so that the temperature of the curable resin does not reach 120°C even when the heat generated during curing is superimposed. On the other hand, after heat generation due to curing occurs and it is detected that the temperature of the lining material 10 has changed from temperature rise to temperature drop, 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 temperature rise to temperature drop, and further, when it is detected that the temperature of the lining material 10 has dropped to a substantially constant temperature (70°C in the example shown in FIG. 6), the set temperature of the mixing device 37 is increased from 80°C to 100°C. Since the temperature of the lining material 10 has changed from temperature rise to temperature drop and has dropped to a substantially constant temperature, the curing of the curable resin is completed to a sufficient level. From this state, by supplying compressed air at a higher temperature, the strength of the curable resin can be increased. In the example shown in FIG. 6, the temperature of the lining material 10 is heated to a temperature substantially the same as the peak temperature. Note that the temperature of the compressed air (the set temperature of the mixing device 37) may be determined according to the degree of improvement in the strength of the curable resin. For example, when it is expected that the strength can be improved by heating the lining material 10 to a temperature higher than the peak temperature (90°C), it is preferable to heat it to a higher temperature within the range not exceeding the above heat-resistant temperature (120°C).Alternatively, conversely, when sufficient strength improvement can be expected without heating the lining material 10 up to the peak temperature (90 °C), it is preferable to suppress the heating cost of the boiler 35 by raising the temperature only up to a predetermined temperature below the peak temperature.

[0084] When continuously heating the curable resin with the compressed air whose temperature has been raised, if it exceeds a certain time, there will be no change in strength improvement. Therefore, the heating time should be determined in advance through experiments together with the temperature of the compressed air whose temperature is raised. The heating time can be 30 minutes to 90 minutes. As described above, since the volume of the outer space MS of the main body part is narrowed to 2 / 3 or less of the volume of the pipeline K, the heating cost of the boiler 35 and the driving cost of the compressor 36 can be continuously suppressed, and the effect of the volume reduction member 20 is great. Also, when heating the lining material 10, since the compressed air directly hits the lining material 10, the heating efficiency is better than when there is something in between.

[0085] By continuously supplying compressed air from step S5 to step S6, with the lining material 10 pressed against the inner peripheral wall K3 of the pipeline K, the thermosetting resin impregnated in the base material layers 101, 111 cures and increases in strength, the inner peripheral wall K3 of the pipeline K is lined with the lining material 10, and a new self-supporting pipeline by the lining material 10 is formed inside the inner peripheral wall K3 of the pipeline K.

[0086] During steps S5 to S6, compressed air is not supplied to the main body part 21, but the air inside the main body part 21 is also heated and expanded by the compressed air blown out into the outer space MS of the main body part, and the state where the main body part 21 bulges is well maintained.

[0087] In steps S5 to S6, compressed air is used, but warm water may be used instead of compressed air. When using warm water, supply warm water to the support portion 22, let it flow out from the arrival side (exit K2 side) of the lining material 10 into the outer space MS of the main body portion, recover the warm water from the starting side (entrance K1 side) of the lining material 10 to the boiler 35, reheat it, and supply it again to the support portion 22 from the supply hose SH. Also, instead of heated air, a mist-like substance may be used.

[0088] Also, instead of normal-temperature compressed air, normal-temperature or low-temperature liquid may be used to expand the main body portion 21.

[0089] Steps S5 to S6 described above correspond to an example of the lining process of the present invention.

[0090] Then, in step S7 shown in FIG. 2, supply normal-temperature air instead of heated air to cool the cured lining material 10 and the outer space MS of the main body portion.

[0091] In the subsequent step S8, remove the band 21B that tied the end portion on the arrival side of the main body portion 21, and the main body portion 21 collapses. Also, remove the arrival-side plug member 31 and the starting-side plug member 32, and remove the volume reduction member 20 from the pipeline K. Further, remove the supply hose SH and the recovery hose CH.

[0092] After that, finish the pipe ends (step S9). In this pipe end finishing, cut the lining material 10 at the inlet K1 and the outlet K2 of the pipeline K respectively, and cure the cut portions.

[0093] Note that in many cases, a mounting pipe is attached to the pipeline. In this case, perforate the location corresponding to the connection portion of the mounting pipe, and perform the operation of connecting the mounting pipe to the new self-supporting pipeline made of the lining material 10.

[0094] Finally, the state of the inner peripheral wall formed by the extension layer 112 of the lining material 10 is finally confirmed by a TV camera (step S10), the construction site is cleaned up (step S11), and all the steps of pipeline repair are completed.

[0095] Subsequently, a modified example of the pipeline inner peripheral side intermediate body 1 will be described. In the following description, components having the same names as the components described so far are denoted by the same reference numerals as those used so far and are omitted. Also, descriptions overlapping with those described so far may be omitted.

[0096] FIG. 7 is a cross-sectional view showing a state where the lining material of the pipeline inner peripheral side intermediate body of the modified example is expanded in diameter. This cross-sectional view is, like the cross-sectional view shown in FIG. 4, a view when the cross-section is taken perpendicular to the extending direction of the pipeline.

[0097] In the volume reduction member 20 shown in FIG. 7(A), the main body portion 21 has a double cylinder structure. That is, compressed air is supplied and inflated into the space 21i between the outer cylinder 211 and the inner cylinder 212. The inside of the inner cylinder 212 is a cavity h1, and the amount of compressed air supply can be reduced by the amount of this cavity h1 compared to the main body portion 21 shown in FIG. 3. The support portions 22 are located at the 2 o'clock position, the 6 o'clock position, and the 10 o'clock position.

[0098] In the volume reduction member 20 shown in FIG. 7(B), the main body portion 21 is provided in one turn in a state where the thin cylinder bodies 213 extending in the extending direction of the pipeline K are in contact with each other in the circumferential direction, and the central portion is a cavity h2. The thin cylinder bodies 213 adjacent to each other in the circumferential direction are connected. The thin cylinder body 213 is thinner than the cavity h2 in the central portion and thinner than the support portion 22. Further, these thin cylinder bodies 213 have a common blowing port (not shown) gathered together on the starting side (the inlet K1 side), and when compressed air is supplied from this common blowing port, each thin cylinder body 213 expands and becomes a thick pipe shape as a whole as shown in FIG. 7(B). Also, four support portions 22 are provided and are fixed to the thin cylinder body 213 at the 12 o'clock position, the thin cylinder body 213 at the 3 o'clock position, the thin cylinder body 213 at the 6 o'clock position, and the thin cylinder body 213 at the 9 o'clock position, respectively. Note that five or more support portions 22 may be provided.

[0099] The volume reduction member 20 shown in Fig. 7(C) has a structure in which the main body portion 21 and the support portion 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 at the stage of step S4 of setting the intermediate body 1 on the inner peripheral side of the pipeline in the pipeline shown in Fig. 2, it expands up to the support portion 22. The support portion 22 in Fig. 7(C) also keeps the columnar main body portion 21 in a state of having a gap from the lining material 10, but it is not provided continuously over the entire length of the pipeline K, but is provided intermittently. In this example, when viewed over the entire length of the pipeline K in the extending direction, the support portion 22 is provided at four positions in the circumferential direction of the main body portion 21. Hereinafter, the uppermost support portion is referred to as the first support portion 22-1, the right-side support portion is referred to as the second support portion 22-2, the lowermost support portion is referred to as the third support portion 22-3, and the left-side support portion is referred to as the fourth support portion 22-4. Among the support portions 22 provided at these four positions, the support portions 22 provided at three positions contact the inner peripheral wall K3 via the lining material 10, and the support portion 22 is not provided at the remaining one position. At the position of the cross-section in the cross-sectional view shown in Fig. 7(C), the first support portion 22-1 is not provided, and Fig. 7(C) shows the first support portion 22-1 provided on the back side from that cross-section. Fig. 7(D) is a view showing that the support portion 22 is provided intermittently in the extending direction of the main body portion 21. In this Fig. 7(D), the left-right direction of the figure is the extending direction of the pipeline K. Note that the thickness of the lining material 10 is shown much thicker than the actual thickness. Fig. 7(D) shows the first support portion 22-1 and the third support portion 22-3. Fig. 7(C) is a cross-sectional view taken along line A-A' in Fig. 7(D). Fig. 7(D) shows a region a1 where the first support portion 22-1 is not provided and a region a3 where the third support portion 22-3 is not provided.In the extending direction of the pipeline K, there is an area (not shown in the figure) where the second support portion 22-2 is not provided next to the area a1 where the first support portion 22-1 is not provided. Next to the area where the second support portion 22-2 is not provided, there is an area a3 where the third support portion 22-3 is not provided. Next to the area a3 where the third support portion 22-3 is not provided, there is an area (not shown in the figure) where the fourth support portion 22-4 is not provided. Next to the area where the fourth support portion 22-4 is not provided, there is an area a1 where the first support portion 22-1 is not provided. By doing so, the spaces between the support portions 22 adjacent to each other in the circumferential direction are connected in the areas where the support portions 22 are not provided.

[0100] The support portion 22 is not provided with slit holes 221 or round holes 222, and the support portion 22 is sealed. Therefore, at the stage of step S4, when the main body portion 21 expands and the support portion 22 also expands sufficiently until it abuts against the inner peripheral wall K3 via the lining material 10, the supply of compressed air ends and maintains the expanded state.

[0101] In the pipeline inner peripheral side intermediate body 1 shown in FIG. 7(C), a fluid supply hose 40 is inserted in the factory. FIG. 7(C) shows the fluid supply hose 40. The starting side end of this fluid supply hose 40 is connected to a supply hose SH extending from the boiler 35 via a starting side plug member 32, and the reaching side end extends to before the reaching side plug member 31. The fluid supply hose 40 is provided with a plurality of round holes 42 and slit holes 41 (see FIG. 8(C)) similar to the support portion 22 shown in FIG. 5. The supply of heated air to the outer space MS of the main body portion in steps S5 and S6 is performed by the fluid supply hose 40, and the heated air is supplied from the plurality of round holes 42 and slit holes 41 to the outer space MS of the main body portion. In the pipeline inner peripheral side intermediate body 1 shown in FIG. 5 and the pipeline inner peripheral side intermediate body 1 shown in FIGS. 7(A) and 7(B), the support portion 22 also serves as the fluid supply hose 40.

[0102] Also in Fig. 7(E), the same fluid supply hose 40 as that described with reference to Fig. 7(C) is shown, and the lining material 10 is in a state of being expanded in diameter. In the volume reduction member 20 shown in Fig. 7(E), the main body portion 21 inflated with compressed air is suspended by a suspension member 25 temporarily fixed to the ceiling portion of the lining material 10. The suspension member 25 also corresponds to an example of a distance holding portion that keeps the main body portion 21 inflated in a cylindrical shape at a distance from the lining material 10. The suspension member 25 is in the form of a belt or a string and is attached at several locations in the longitudinal direction of the lining material 10. In step S8 shown in Fig. 2, by pulling the main body portion 21 with the air removed therefrom somewhat strongly, the suspension member 25 is detached from the lining material 10, and the volume reduction member 20 can be removed. Even if the suspension member 25 is omitted and the main body portion 21 is placed on the bottom portion of the lining material 10, since the supply space for the heated air is narrowed by the amount of the main body portion 21 shown in Fig. 7(E), the heating cost of the boiler 35 and the driving cost of the compressor 36 can be continuously suppressed, and the effect of the main body portion 21 shown in Fig. 7(E) is great.

[0103] In the volume reduction member 20 shown in FIG. 7(F), the main body 21 is filled with a gas (e.g., nitrogen gas) lighter than air. Also shown in this FIG. 7(F) is the same fluid supply hose 40 as that described with reference to FIG. 7(C), and the lining material 10 is in a state of being expanded in diameter. Since the main body 21 would touch the ceiling of the lining material 10 if left alone, the main body is retained by a retaining member 26 temporarily fixed to the bottom of the lining material 10. The retaining member 26 also corresponds to an example of a spacing holding portion that keeps the main body 21 at a distance from the lining material 10. The retaining member 26 is in the form of a string or a belt and is attached at several locations in the longitudinal direction of the lining material 10. In step S8 shown in FIG. 2, by pulling the main body 21 with the air removed inside it somewhat more strongly as before, the retaining member 26 is detached from the lining material 10, and the volume reduction member 20 can be removed. Even if the retaining member 26 is omitted and the main body 21 is in a state of touching the ceiling of the lining material 10, since the supply space of the heated air is narrowed by the amount of the main body 21 shown in FIG. 7(F), the heating cost of the boiler 35 and the driving cost of the compressor 36 can continue to be suppressed, and the effect of the main body 21 shown in FIG. 7(F) is also significant.

[0104] FIG. 8 is a diagram showing two types of modified examples of the intermediate body on the inner peripheral side of the pipeline.

[0105] FIG. 8(A) is a view of the intermediate member 1 on the inner peripheral side of the pipeline as seen from the inlet K1 side in a state where it is drawn into the pipeline. Although the pipeline is not shown in this FIG. 8(A), the flattened intermediate member 1 on the inner peripheral side of the pipeline is in a curved state along the bottom of the inner peripheral surface of the pipeline (not shown). The intermediate member 1 on the inner peripheral side of the pipeline described so far is also in such a flattened and curved state when drawn into the pipeline. Inside the intermediate member 1 on the inner peripheral side of the pipeline shown in FIG. 8(A), a fluid supply hose 40 and a volume reduction member 20 are inserted. The fluid supply hose 40 is also flattened. The volume reduction member 20 has a cylindrical main body portion 21 and leg portions 27 attached at four positions in the circumferential direction of the main body portion 21. The main body portion 21 is also flattened. The leg portions 27 are rigid bodies such as metal, and a link mechanism is provided at the joint portion and is rotatable by the link mechanism. The leg portions 27 are provided with a spring member (not shown) for maintaining the state of extending in the radial direction. The leg portions 27 shown in FIG. 8(A) are lying along the main body portion 21 against the biasing force of the spring member.

[0106] FIG. 8(B) is a cross-sectional view showing a state where the lining material of the intermediate member on the inner peripheral side of the pipeline shown in FIG. 8(A) is expanded in diameter. This cross-sectional view is also a view when cross-sectioned perpendicular to the extending direction of the pipeline, similar to the cross-sectional view shown in FIG. 4. Note that the scale of FIG. 8(B) is considerably smaller than the scale of FIG. 8(A).

[0107] Heated air is supplied to the fluid supply hose 40 shown in FIG. 8(B). Further, the main body portion 21 shown in FIG. 8(B) is filled with compressed air and bulges in a cylindrical shape. As the main body portion 21 bulges, the four leg portions 27 gradually rise from the lying state by the biasing force of the above-described spring member, and the leg portions 27 shown in FIG. 8(B) are in a state immediately before completely extending in the radial direction, and the biasing force of the spring member is still effective. The tip of this leg portion 27 abuts against the inner peripheral wall K3 via the lining material 10, and corresponds to an example of a spacing holding portion that keeps the main body portion 21 spaced from the lining material 10.

[0108] Note that the leg portion 27 can also be simply configured with a plate material that protrudes in the radial direction and extends in the extending direction of the pipeline K. Also in this case, the plate material as the leg portion 27 lies along the main body portion 21 in a state where the main body portion 21 is flattened, and rises as the main body portion 21 swells, and finally protrudes in the radial direction. The plate material does not need to be provided over the entire length of the main body portion 21, and may be provided at predetermined intervals.

[0109] The main body portion 21 of the volume reduction member 20 described so far is a cylindrical soft member extending in the extending direction of the pipeline, and can be easily bent in the longitudinal direction at any position. Note that the main body portion 21 was inflated by filling it with compressed air, but it may be a rubber pipe or a bellows-shaped pipe. With these pipes, it is not necessary to fill them with compressed air and inflate them. Also, with a rubber pipe or a bellows-shaped pipe, it is possible to bend in the longitudinal direction at any position. When using these pipes, it is necessary to provide a distance holding member (for example, the support portion 22, the suspension member 25, or the leg portion 27) that keeps the pipe at a distance from the lining material 10. Further, these pipes may be inserted into the lining material 10 in advance at the factory, or may be drawn into the lining material 10 arranged in the pipeline at the construction site.

[0110] The main body portion 21 of the volume reduction member 20 to be described hereinafter is formed by connecting blocks of expanded polystyrene, and each block of expanded polystyrene cannot be bent.

[0111] FIG. 8(C) is a diagram schematically showing a state in which a connected body of blocks of expanded polystyrene is set in the pipeline. Also in this FIG. 8(C), the left-right direction in the figure is the extending direction of the pipeline K, but as in FIG. 3, the entire length of the pipeline K is shown to be much shorter than the actual length. Also, the thickness of the lining material 10 is shown to be much thicker than the actual thickness.

[0112] The connecting body 28 shown in Fig. 8(C) is formed by connecting blocks 281 of expanded polystyrene with a connecting belt 282 and extends in the extending direction of the pipeline K. The connecting body 28 can be bent at the location of this connecting belt 282. At the factory, it is only necessary to draw the fluid supply hose 40 into the cylindrical lining material 10, and the connecting body 28 is passed inside the lining material 10 on-site. That is, after the lining material 10 is drawn into the pipeline K, the drawing wire Y1 shown in Fig. 3 is replaced at the tip of the connecting body 28, and the drawing wire Y1 is wound by a winch W via a pulley P to pass the connecting body 28 inside the lining material 10. The connecting body 28 is passed inside the lining material 10 while bending at the location of the connecting belt 282 at the entrance M11 of the starting side manhole M1 and the entrance K1 of the pipeline K. The connecting body 28 shown in Fig. 8(C) is thus passed inside the lining material 10.

[0113] Also, an arrival side plug member 31 is applied to the opening end portion on the arrival side (exit K2 side) of the lining material 10 shown in Fig. 8(C) from the inner peripheral side. The right end block 281r of the connecting body 28 protrudes from the through hole at the center portion of this arrival side plug member 31. The arrival side plug member 31 is attached by fitting the right end block 281r into the through hole, and the right end block 281r serves as a lid to seal the end portion on the arrival side of the pipeline inner peripheral side intermediate body 1. A dedicated plug member 39 is applied to the opening end portion on the starting side (entrance K1 side) of the lining material 10 from the inner peripheral side. A heating fluid supply port 392 for supplying heating fluid to the fluid supply hose 40 is provided at the 12 o'clock position of this dedicated plug member 39, and a fluid discharge port 393 is provided at the 6 o'clock position. Also, a through hole is provided at the center portion of the dedicated plug member 39 in the same manner as the arrival side plug member 31, and the left end block 281l is attached by fitting it into this through hole, and the left end block 281l serves as a lid to seal the end portion on the starting side of the pipeline inner peripheral side intermediate body 1.

[0114] Furthermore, inside the inner peripheral intermediate body 1 of the pipeline shown in Fig. 8(C), a fluid supply hose 40 pre-inserted in the factory extends. The fluid supply hose 40 shown in Fig. 8(C) extends along the ceiling of the lining material 10 and is sandwiched between the connecting body 28 and the lining material 10. The space in the interval between the connecting body 28 and the lining material 10 shown in Fig. 8(C) is referred to as the outside connecting space LS. The end opening on the starting side (the inlet K1 side) of the fluid supply hose 40 is fitted into the portion of the dedicated plug member 39 that connects to the heating fluid supply port 392.

[0115] The fluid supply hose 40 shown in Fig. 8(C) is also provided with round holes 42 at intervals of 1 m along the extending direction of the pipeline K, and a slit hole 41 is also provided at the end on the reaching side (the outlet K2 side). Also in Fig. 8(C), the round holes 42 and the slit hole 41 are shown relatively large. Further, the round holes 42 and the slit hole 41 are arranged in a row in the extending direction of the pipeline K, and the round holes 42 and the slit hole 41 are also arranged in a row in the extending direction of the pipeline K on the 180-degree opposite side in the circumferential direction of the fluid supply hose 40. In this modification, hot water at about 80°C is sent out from the boiler 35 (see Fig. 5) instead of heated air, and the hot water is supplied from the round holes 42 and the slit hole 41 of the fluid supply hose 40 to the outside connecting space LS. The outside connecting space LS shown in Fig. 8(C) is filled with hot water. The styrofoam block 281 tries to float up but is held down by the fluid supply hose 40. In this modification, the fluid supply hose 40 corresponds to an example of a spacing holding part that keeps the connecting body 28 at a distance from the lining material 10. Note that the hot water filling the outside connecting space LS is recovered from the fluid discharge port 393 provided in the starting side plug member 32 to the boiler 35, reheated, and sent out again toward the fluid supply hose 40.

[0116] In the above description, a thermosetting resin has been used, but other curable resins may also be used. For example, a photocurable resin may be used. When using a photocurable resin, in order to cool the heat generated during photocuring, cooling air or water is continuously supplied to the outer space MS of the main body. As described above, since the volume of the outer space MS of the main body is narrowed to 2 / 3 or less of the volume of the pipeline K, the driving cost of the compressor that continuously sends cooling air and the driving cost of the pump that continuously sends cooling water can be continuously suppressed. Even when using a photocurable resin, the effect of the volume reduction member 20 is significant. When using a photocurable resin, the main body 21 may be made of a transparent material, and the light for curing may be irradiated from the inside of the main body 21.

[0117] Also, although the volume reduction member 20 is arranged over the entire length of the pipeline K (between the starting manhole M1 and the arrival manhole M2), it may be arranged only on a part of the entire length of the pipeline K. That is, the diameter (thickness) and length of the volume reduction member 20 may be determined so that the reduction ratio of the volume by the volume reduction member 20 is 30% or more. In order to uniformly heat the lining material 10 with a heating fluid, it is preferable to make the cross-sectional area of the outer space MS of the main body approximately the same over the entire length of the lining material 10.

[0118] The present invention is not limited to the embodiments and modifications described so far, and various changes can be made within the scope described in the claims. For example, the lining material 10 in this embodiment is in the shape of a sleeve, but it may be in the shape of a sheet. Also, the lining material 10 in this embodiment is an integrated structure of two sleeve-shaped lining materials, namely the base hose 100 and the calibration hose 110. However, it may be a structure in which the base hose 100 is omitted and the thickness of the calibration hose 110 is increased. Also, 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 the pipeline of an existing pipe but also for forming a smooth inner peripheral surface of a newly installed pipe.

[0119] Moreover, even if a constituent element is only included in the description of the embodiment and the description of the modification example described above, the constituent element may be applied to the embodiment and other modification examples.

Description of Reference Numerals

[0120] 1 Inner Peripheral Intermediate Member in Pipeline 10 Lining Material 100 Base Hose 110 Calibration Hose 20 Volume Reduction Member 21 Main Body Portion 22 Support Portion Outer Space of MS Main Body Portion K Pipeline

Claims

1. In a pipe inner peripheral side intermediate body used in a pipe lining method for backing the inner peripheral surface of a pipe buried in the ground using a fluid, a volume reduction member disposed inside the inner peripheral surface; a lining material disposed between the volume reduction member and the inner peripheral surface and having an impregnated curable resin in an uncured state; the volume reduction member has a main body portion disposed at a position spaced apart from the lining material while the lining material is pressed against the inner peripheral surface; the lining material is pressed against the inner peripheral surface by contact with a fluid supplied to the space to line the inner peripheral surface; the main body portion is elongated in the extending direction of the pipe, and is filled with fluid and inflated with both longitudinal ends closed while the lining material is pressed against the inner peripheral surface. A pipe inner peripheral side intermediate body characterized by this.

2. The main body portion is filled with air and inflated with both longitudinal ends closed while the lining material is pressed against the inner peripheral surface, the lining material is impregnated with a thermosetting resin, and the thermosetting resin cures while being pressed against the inner peripheral surface by contact with a heated fluid supplied to the space to line the inner peripheral surface. The pipe inner peripheral side intermediate body according to Claim 1, characterized by this.

3. The volume reduction member has a space holding portion that contacts the lining material and keeps the main body portion spaced apart from the lining material while the lining material is pressed against the inner peripheral surface. The pipe inner peripheral side intermediate body according to Claim 1 or 2, characterized by this.

4. The space holding portion is evenly arranged in the circumferential direction of the main body portion. The pipe inner peripheral side intermediate body according to Claim 3, characterized by this.

5. A drawing step of drawing the pipe inner peripheral side intermediate body according to any one of Claims 1 to 4 into a pipe buried in the ground; a fluid supply step of supplying fluid into the main body portion and ending the supply of the fluid when the main body portion expands; A pipe lining method characterized by having a lining step of supplying fluid to the space, pressing the lining material against the inner peripheral surface, and lining the inner peripheral surface with the lining material.

6. The lining step is a step of continuously supplying fluid to the space. The pipe lining method according to Claim 5, characterized by this.

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