JP2011025675A - Tubular lining material and regeneration method for existing tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular lining material which eliminates the nonuniform heating of a liner substrate comprising composite materials including thermoplastic filament and reinforcing fiber filament, and to provide a regeneration method for an existing tube using the lining material. <P>SOLUTION: In one embodiment, the lining material 1 includes a liner substrate 2 comprising composite materials including thermoplastic filament and reinforcing fiber filament and an outer face covering material layer 3a arranged outside the liner substrate. The outer face covering material layer 3a is formed of a thermoplastic material with its melting point higher than that of the constituent material of the thermoplastic filament of the liner substrate 2. In regeneration of an existing tube 5, the liner substrate 2 is heated and softened at a temperature below the melting point of the thermoplastic material in the outer face covering material layer 3a, and pressurized from inside with a diameter expanding means, causing the lining material 1 to be molded into a tubular shape along the inner circumferential face of the existing tube 5 for lining. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tubular lining material and a method for rehabilitating an existing pipe using the tubular lining material.

  Conventionally, as a method of rehabilitation without excavating underground pipes such as sewer pipes, a method of inserting an uncured FRP cylindrical body into a pipe line, a tubular lining material made of a thermoplastic resin (hereinafter referred to as a pipe lining material) There is a method of lining the inner surface of the existing pipe by inserting it into the existing pipe and attaching it to the inner surface of the existing pipe.

  For example, as described in Patent Document 1, a lining material that is smaller than the inner diameter of an existing tube and that recovers the shape of the tube at the shape memory temperature is inserted into the existing tube, and the lining material is heated to recover the shape. Then, there is a rehabilitation method in which pressure is applied to expand and expand the diameter, and the lining is brought into close contact with the inner peripheral surface of the existing pipe.

  Recently, as described in Patent Document 2 and Patent Document 3, a liner made of a thermoplastic composite material reinforced with fibers is inserted into a duct, and the liner is heated and pressure is applied. A method of lining in contact with a pipe has been proposed.

  The liner disclosed in Patent Document 2 and Patent Document 3 is formed into a substantially cylindrical shape by a composite material of a thermoplastic filament made of a thermoplastic material and a reinforcing fiber filament made of glass fiber in a stage before being heated. Is formed. As a method of rehabilitating an existing pipe using this liner, the thermoplastic filament is melted by inserting the liner into a duct and then heating the liner with a heating means. As a result, the reinforcing fiber filaments are dispersed in the molten plastic material. Then, pressure is applied to the inside of the liner to expand the diameter and the plastic material is cooled and solidified to form a strong composite lining material reinforced with reinforcing fiber filaments, and the existing pipe is rehabilitated with this composite lining material. become.

Japanese Patent Laid-Open No. 11-230212 Japanese Patent No. 4076188 Special table 2004-508989 gazette

  However, the lining method using a lining material made of a fiber-reinforced composite material as disclosed in Patent Document 2 and Patent Document 3 has the following problems and is intended for practical use. There was still room for improvement.

  First, in the rehabilitation work of the existing pipe, it can be mentioned that it takes a relatively long time to melt the plastic material constituting the thermoplastic filament. For example, when underground water has infiltrated into the existing pipe from a damaged part such as a crack generated in an aging existing pipe, the lining material is cooled by the intruded water in that part. Moreover, even if there is no intrusion of groundwater, the existing pipe is relatively cold, so the lining material is cooled, and it is difficult to quickly heat and melt the plastic material.

  Patent Document 2 gives an example in which a barrier layer made of a plastic material such as polyethylene is provided on the inner surface of the liner. The plastic material constituting the thermoplastic filament is heated and melted from the inside. Before, the barrier layer on the inner surface may melt and flow, or the barrier layer may hinder heat transfer to the plastic material. Even in such a case, the plastic material cannot be melted quickly.

  As a result, it takes a relatively long time to melt the entire thermoplastic filament, or heating becomes non-uniform, leading to a prolonged construction time.

  Moreover, when the heating with respect to such a lining material becomes non-uniform | heterogenous, it will become easy to generate | occur | produce an undissolved residue in a thermoplastic filament. When the unmelted portion is generated, the structure in which the reinforcing fiber filaments are dispersed in the plastic material cannot be obtained in that portion, which leads to uneven strength of the lining material.

  In order to avoid the occurrence of such unmelted residue, it is conceivable that the heating temperature for the plastic material is set high or the heating time is set long. However, in this case, there is a possibility that the heating is partially excessive. In this excessively heated portion, a part of the plastic material may flow, and uneven thickness may occur in the lining material. Even when uneven thickness occurs, it is not possible to obtain a configuration in which reinforcing fiber filaments are dispersed in the plastic material in that portion, which may cause uneven lining material strength.

  The present invention has been made in view of such circumstances, and its purpose is to achieve uniform heating while protecting a lining material including a composite material of thermoplastic filaments and reinforcing fiber filaments. It is an object of the present invention to provide a tubular lining material capable of exerting a sufficient strength and a method for rehabilitating an existing pipe using the lining material.

  The solution means of the present invention for achieving the above object is based on a tubular lining material for lining the inner wall of an existing pipe. To this tubular lining material, a liner base material of a cylindrical fabric made of a composite material including a thermoplastic filament and a reinforcing fiber filament, and a thermoplastic material that covers the liner base material and constitutes the thermoplastic filament. And a coating layer containing a thermoplastic material having a melting point higher than the melting point.

  According to this specific matter, after the tubular lining material is inserted into the existing pipe, when the tubular lining material is heated, the thermoplastic filament contained in the liner base material is melted by the heat applied to the tubular lining material, thereby While the material is softened, it is possible to prevent the coating layer covering the liner substrate from being melted. For this reason, in the state which protected the liner base material with the coating layer, the substantially whole thermoplastic filament can be fully heated. As a result, it is possible to eliminate uneven heating of the tubular lining material, and the entire thermoplastic filament can be melted in a relatively short time.

  As a result, the construction time for obtaining the configuration in which the reinforcing fiber filaments are dispersed in the thermoplastic material, that is, the configuration in which the molten thermoplastic material surrounds the reinforcing fiber filaments is obtained over the entire tubular lining material. be able to. Further, since the heating to the tubular lining material is made uniform, no unmelted residue is generated in the thermoplastic filament, and it is possible to avoid a part of the thermoplastic filament from being overheated and flowing.

  The coating layer may be configured to be sheathed on the liner substrate, or may be configured to be trimmed on the liner substrate.

  First, in the case of a configuration in which the covering layer is sheathed on the liner base material, a cylindrical outer surface covering material layer having an outer diameter smaller than the inner diameter of the existing pipe is provided as the covering layer. Thereby, the outer surface covering material layer is interposed between the existing pipe and the liner base material, the liner base material is prevented from being cooled in a low temperature environment in the existing pipe, and the thermoplastic material constituting the thermoplastic filament is reduced. It becomes possible to raise the temperature sufficiently.

  Specifically, the outer surface covering material layer has a multilayer structure in which a plurality of layers are integrated, an inner heat insulating layer formed of the thermoplastic material and having heat insulating properties, and an outer peripheral side of the inner heat insulating layer. And an outer water shielding layer made of a water-impermeable material.

  With such a configuration, the inner heat insulating layer prevents the liner base material from being cooled by the low temperature environment in the existing pipe where intrusion water or the like exists, and prevents heat loss during heating. Prevent the material from coming into contact with intrusion water. Due to the heat insulation performance and water shielding performance of the outer surface covering material layer, it is possible to eliminate uneven heating of the tubular lining material in the existing pipe.

  Further, the outer surface covering material layer is preferably such that the inner heat insulating layer is made of any one of a woven fabric, a braided fabric, a knitted fabric, a felt, or a non-woven fabric.

  As a result, the liner base material can be coated in a shape that follows the outer surface of the liner base material made of a tubular fabric, and the liner base material and the outer surface coating material layer can be sewn together, making it easy to handle. Become. Further, the thickness can be easily adjusted by superimposing the number of sheets in accordance with the heat insulating performance required for the outer surface covering material layer.

  The thermoplastic material constituting the inner heat insulating layer is selected by the thermoplastic material constituting the thermoplastic filament of the liner base material, but by using polyethylene terephthalate fiber or cellulose acetate fiber having a generally high melting point, The melting timing of the liner base material and the inner heat insulating layer can be shifted.

  Further, the outer surface covering material layer may be a foam molded body in which the inner heat insulating layer has closed cells. Thereby, it becomes possible to equip an inner side heat insulation layer with high heat insulation, heat retention, and lightweight.

  Moreover, it is preferable that the said outer surface coating material layer comprises the said outer side water-impervious layer from the water-impermeable film material which has a softness | flexibility. Further, the outer water-impervious layer may be formed of a synthetic resin material having a low elastic modulus at room temperature.

  As such an outer water-impervious layer, for example, a thin film-like polyethylene or EVA resin material can be used. Thereby, an outer side water-impervious layer becomes a thing suitably coat | covered with the shape which followed the outer surface of the liner base material, and can prevent the intrusion water etc. in an existing pipe | tube, and a liner base material from contacting.

  Further, the outer surface covering material layer is a heat generating tubular body containing a heat generating agent that reacts with water, and generates heat between an existing tube and a liner base material to heat the liner base material. Good.

  Here, for example, calcium chloride can be used as a heat generating agent that reacts with water. Thereby, an outer surface coating material layer contacts the ground water and running water in an existing pipe, and it generates heat, and it can heat a liner base material from the outer surface side of a liner base material.

  More specifically, the exothermic tubular body as the outer surface covering material layer includes a layer made of any one of a woven fabric, a braided fabric, a knitted fabric, a felt, or a non-woven fabric in which a heat generating agent is uniformly dispersed. It is preferable.

  Thereby, it can be set as the exothermic tubular body which contained the exothermic agent uniformly, and it becomes possible to provide uniform exothermic property. Moreover, it becomes easy to form the heat generating tubular body by following the shape of the liner base material, and the outer surface of the liner base material can be heated evenly.

  Further, when the coating layer is configured to be embedded in the liner base material, the inner surface of the liner base material is provided with a gap or an opening as the coating layer and has air permeability, while the gap or opening is closed by heating and melting. A cylindrical inner surface covering material layer that can be formed is provided.

  Thus, when heating the tubular lining material from the inner surface side, the liner base material is first melted by the heat applied to the tubular lining material, and then the inner surface coating material layer covering the inner surface of the liner base material is melted. Is possible. At this time, since the inner surface covering material layer has a gap or an opening and has air permeability, the heating action on the liner base material is not hindered. As a result, substantially the entire thermoplastic filament can be sufficiently heated, and the uneven heating of the tubular lining material is eliminated, and the entire thermoplastic filament can be melted in a relatively short time. Become.

  Further, after the liner base material is melted, the inner surface covering material layer is melted to close the gap or the opening, so that the melted inner surface covering material layer covers and protects the inner surface of the liner base material. Thereby, the renovated existing pipe is not exposed to the fluid in the pipe without exposing the lining layer of the liner base material. Therefore, the existing pipe rehabilitated with such a tubular lining material has improved corrosion resistance against fluids containing acidic components such as sewage, and there is no risk of strength reduction due to corrosion, and the inside of the pipe after rehabilitation is good for a long time. It can be maintained in a state.

  Specifically, the inner surface covering material layer is preferably made of any one of woven fabric, braided fabric, knitted fabric, felt, or non-woven fabric. As a result, the inner surface of the liner base material can be coated in a shape that follows the inner surface of the liner base material made of a tubular fabric, and it is easy to handle, and the number of sheets is stacked in accordance with the required inner surface protection performance. The wall thickness can be adjusted easily.

  Moreover, the structure which consists of a perforated sheet material or a perforated film material may be sufficient as the said inner surface covering material layer. In this case, since the inner surface covering material layer can be formed relatively thin, the inner surface of the liner base material can be covered without greatly reducing the inner diameter.

In addition, when the tubular lining material is heated from the inner surface side, if the air permeability of the inner surface covering material layer is too small, natural air entry / exit becomes difficult, which may hinder heating of the liner substrate. On the other hand, when the air permeability of the inner surface covering material layer is too large, the void portion becomes large and the protective effect on the liner base material is lowered. Therefore, the fragile air permeability before heating and melting in the inner surface covering material layer is preferably set to 1000 to 30000 cm ³ / cm ² · min. Here, the fragile air permeability refers to an evaluation value of air permeability measured by a fragile type test method defined in JIS L 1096.

Furthermore, after heating the tubular lining material, the lining layer of the liner base material is protected by the inner surface coating material layer to suitably obtain water tightness and corrosion resistance. Therefore, the volume per unit area after heating and melting is 0.003 to 0.003. It is preferable to use an inner surface covering material layer of 0.05 cm ³ / cm ² . Thereby, it becomes possible to coat | cover a liner base material uniformly, without producing a defect | deletion in an inner surface coating material layer, or producing a resin pool conversely.

  By providing the tubular lining material with the coating layer as described above, the liner base material can be uniformly heated and sufficiently melted, and partial unmelted portions can be prevented. As a result, it is possible to rehabilitate existing pipes while maintaining sufficient strength and having high durability. In addition, the structure provided with both the outer surface covering material layer and the inner surface covering material layer with respect to the said liner base material as a coating layer provided in a tubular lining material may be sufficient.

  Moreover, the rehabilitation method of the existing pipe | tube using the tubular lining material which concerns on each solution mentioned above is also the category of the technical idea of this invention. That is, it is premised on a method for rehabilitating an existing pipe in which a lining layer made of a tubular lining material is formed on the inner wall of the existing pipe. Further, a liner base material composed of a composite material including a thermoplastic filament and a reinforcing fiber filament is coated on the tubular lining material, and the melting point of the thermoplastic material constituting the thermoplastic filament is covered with the liner base material. And a coating layer containing a thermoplastic material having a high melting point. Then, as a rehabilitation method, an insertion step in which a tubular lining material is inserted and arranged in a repair target location in an existing pipe, and heating means are arranged on the inside or outside of the tubular lining material, or both inside and outside, and the heating means is moved. The tubular lining material is heated and softened or melted while being heated, and the softened or melted tubular lining material is pressurized from the inside by a diameter expanding means to expand the diameter, and the liner base material and the coating layer are integrated. And a step of cooling the molded lining layer and curing it along the inner peripheral surface of the existing pipe.

  By such a rehabilitation method, the heat applied to the tubular lining material first melts the thermoplastic filaments contained in the liner base material to soften the liner base material, and then forms a coating layer covering the liner base material. Melt or soften. Thereby, the tubular lining material can be heated substantially uniformly, and the entire thermoplastic filament can be melted in a relatively short time. In addition, since the tubular lining material is expanded in the state of being heated and melted substantially uniformly to form the lining layer, a strong composite lining pipe reinforced with reinforcing fiber filaments can be formed in the existing pipe.

  Specifically, in the heating step, the liner base material is softened by heating at a temperature below the melting point of the thermoplastic material of the coating layer, and then the heating temperature is raised to melt or soften the coating layer. Thereby, it is possible to form a lining layer in which the liner base material and the coating layer are integrated while exhibiting the actions of the liner base material and the coating layer.

  Further, in the rehabilitation method of the existing pipe, the tubular lining material has a configuration in which the coating layer is built in a liner base material, and in the insertion step, the liner base material is first disposed in the existing pipe, You may make it insert into the inner side of the liner base material in an existing pipe, making fluid pressure act on a coating layer and inverting so that the inner peripheral surface of the said coating layer may become an outer peripheral side.

  Thereby, the liner base material of a tubular lining material and a coating layer can be prepared separately and can be combined at a repair target location, and workability can be enhanced in correspondence with various existing pipes.

  In the present invention, the liner base material of a tubular fabric made of a composite material including a thermoplastic filament and a reinforcing fiber filament, and the melting point of the thermoplastic material that covers the liner base material and constitutes the thermoplastic filament. And a coating layer containing a thermoplastic material having a high melting point, and when heating the tubular lining material, the coating layer is not melted but only the liner base material is melted, and the existing pipe is renewed. I do. As a result, the tubular lining material can be heated uniformly, and the effect of the coating layer during the heating of the liner base material can be sufficiently exerted, so that the aged existing pipe can be shortened. Rehabilitation can be suitably performed in time.

It is sectional drawing which shows the tubular lining material which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the rehabilitation method of the existing pipe which uses the tubular lining material which concerns on Embodiment 1. FIG. It is sectional drawing which shows the state lined using the tubular lining material which concerns on Embodiment 1. FIG. It is sectional drawing which shows the modification of the tubular lining material which concerns on Embodiment 1. FIG. It is sectional drawing which shows the tubular lining material which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the state lined using the tubular lining material which concerns on Embodiment 2. FIG. It is sectional drawing which shows the tubular lining material which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the state lined using the tubular lining material which concerns on Embodiment 3. FIG. It is explanatory drawing which shows the rehabilitation method of the existing pipe using the tubular lining material which concerns on Embodiment 3. It is sectional drawing which shows the modification of the tubular lining material which concerns on Embodiment 3.

  Hereinafter, a tubular lining material according to an embodiment of the present invention and a method for rehabilitating an existing pipe using the tubular lining material will be described.

  The tubular lining material is a member for lining the inner wall of an existing pipe, and is a tubular fabric liner substrate made of a composite material including a thermoplastic filament and a reinforcing fiber filament, and the liner substrate is coated with the thermoplastic filament. And a coating layer containing a thermoplastic material having a melting point higher than the melting point of the thermoplastic material constituting the. The coating layer covers the outer surface or the inner surface of the liner substrate, or covers both the outer surface and the inner surface of the liner substrate. As embodiments of such a tubular lining material, there are various variations depending on the configurations, materials, and combinations of the liner base material and the coating layer. In the following embodiments, some of them will be specifically described with reference to the drawings.

<Embodiment 1>
The tubular lining material which concerns on Embodiment 1 of this invention The rehabilitation method of the existing pipe | tube using the tubular lining material is demonstrated, referring drawings.

  1 is a cross-sectional view showing a tubular lining material according to Embodiment 1. FIG.

  The tubular lining material 1 (hereinafter referred to as the lining material 1) includes a liner substrate 2 and a coating layer 3 that covers the liner substrate 2.

  Among these, the liner base material 2 is a flexible tubular fabric made of a fiber-reinforced composite material including thermoplastic filaments and reinforcing fiber filaments. The covering layer 3 contains a layer made of a thermoplastic material having a melting point higher than that of the constituent material of the thermoplastic filament contained in the liner substrate 2.

  In the first embodiment, the coating layer 3 is a cylindrical outer surface coating material layer 3 a that is sheathed on the liner substrate 2 and covers the outer surface of the liner substrate 2. The outer surface covering material layer 3a includes a layer containing a thermoplastic material having a melting point higher than that of the constituent material of the thermoplastic filament, and has a multilayer structure composed of a plurality of layers.

(Rehabilitation method for existing pipes)
Here, prior to a specific description of the lining material 1, a rehabilitation method for lining the inner wall of the existing pipe 5 using the lining material 1 will be described.

  FIG. 2 is an explanatory view schematically showing a rehabilitation method for lining the inner wall of the existing pipe 5 using the tubular lining material 1.

  As shown in the drawing, the lining material 1 is inserted into a repair target portion of the existing pipe 5 and used for rehabilitation of the pipeline. Prior to the rehabilitation work, if there is running water such as sewage in the existing pipe 5, this running water is once removed from the pipe. Manholes M1 and M2 are provided in the pipe line of the existing pipe 5 at an appropriate interval, and a damming member 7 is provided on the upstream side of the nearby manhole. The sewage that has been dammed is drawn from the drainage pump through the manholes M1 and M2, and is discharged downstream by bypassing a drainage hose (not shown) disposed on the ground. Further, foreign matter such as deposits and wood chips existing in the existing pipe 5 is removed, and after the high pressure water cleaning is performed, the renovation work in the pipe is started.

  As the rehabilitation work, first, the lining material 1 is inserted into the existing pipe 5 through the manholes M1 and M2 (insertion step). The lining material 1 may be inserted into the existing pipe 5 by simultaneously drawing the lining material 1 into the existing pipe 5 in a combined state of the liner base material 2 and the outer surface covering material layer 3a. May be arranged in the existing pipe 5 and the liner base material 2 may be inserted inside thereof.

  The lining material 1 is prepared, for example, with a length obtained by adding an extra length to the length between the start side manhole M1 and the arrival side manhole M2. Further, a device such as a winch 9 that winds the pulling wire 91 is installed on the ground on the arrival side manhole M2 side. The pulling wire 91 is inserted into the existing pipe 5 from the arrival side manhole M2, and the heating device (heating means) 6 provided inside the liner base material 2 is moved from the start side manhole M1 to the arrival side manhole M2. Tow.

  The heating device 6 is installed inside the lining material 1 arranged in the existing pipe 5 through the insertion process. As shown in FIG. 2, the heating device 6 heats the liner substrate 2 from both the inside and outside.

  The heating device 6 includes a lining pig 61 having a cylindrical outer shape along the inner peripheral surface of the lining material 1 and a cylindrical auxiliary pig 62 that is externally mounted on the liner base material 2. The lining pig 61 is heated from the inner peripheral side of the lining material 1 with heating steam or the like to melt the thermoplastic material contained in the lining material 1. Further, the auxiliary pig 62 heats the outer peripheral surface of the liner substrate 2 and assists the melting of the thermoplastic filament from the outer peripheral side (heating step).

  As shown in FIG. 2, the lining pig 61 of the heating device 6 has a tapered shape in which the rear portion is enlarged in diameter, and the lining material 1 is softened by moving forward while heating the lining material 1. It acts to expand the diameter.

  In this heating step, heating is performed at a temperature lower than the melting point of the thermoplastic material of the outer surface covering material layer 3a in the lining material 1. By this heating, the thermoplastic material of the outer surface covering material layer 3a is not melted, whereas the thermoplastic filament of the liner base material 2 is melted. And the liner base material 2 forms the lining layer which consists of a fiber reinforced resin material which mixed the reinforcing fiber filament.

  The lining material 1 is not yet in a state where the diameter has been completely expanded and cured after the heating step, and the liner base material 2 and the outer surface covering material layer 3a are not in close contact with each other. As shown in FIG. 2, a diameter expanding means is provided behind the heating device 6.

  The lining material 1 that has undergone the heating process is pressurized from the inside by a diameter expanding means and is expanded in a tubular shape along the inner peripheral surface of the existing pipe 5 (a diameter expanding process). The diameter expansion means illustrated in FIG. 2 includes a diameter expansion tube 81 that is installed while the reversing machine 8 is installed on the ground and reversed from the tip side.

  The diameter-expanding tube 81 can be sufficiently expanded by an internal pressure, and is formed of an elastomer having excellent expandability and heat resistance that has sufficient strength during expansion. The diameter-expanding tube 81 is formed of a material that does not adhere the diameter-expanding tube 81 and the liner base material 2 even after the diameter is expanded. The outer diameter of the tube 81 for diameter expansion is ensured with such a size that the lining material 1 can be pressed from the inside to the inner peripheral surface of the existing tube 5 at the time of maximum expansion.

  The diameter expansion tube 81 is connected to the reversing machine 8 installed on the ground on the start side manhole M1 side, and is introduced into the liner base material 2 in an unexpanded state. Then, the pressurized gas is supplied from the reversing machine 8 to the diameter expanding tube 81, and the inner peripheral surface is expanded while being reversed to the outer peripheral side while following the rear portion of the heating device 6. Along with this, the diameter of the lining material 1 is increased by being pressed from the inside by the diameter-expanding tube 81 in order from the softened portion through the heating device 6. The expanded part of the lining material 1 is in close contact with the inner peripheral surface of the existing pipe 5. As the heating device 6 moves forward, the expansion range of the diameter expansion tube 81 is also expanded forward, and the close contact state between the lining material 1 and the existing pipe 5 is maintained as it is, and a uniform force can be applied over a wide range. Can be formed substantially uniformly.

  If the diameter of the lining material 1 is expanded over the entire repair target portion of the existing pipe 5, the lining material 1 is cooled and hardened (cooling process), whereby the inner peripheral surface of the existing pipe 5 is renewed by the lining material 1. FIG. 3 shows a state in which the inner peripheral surface of the existing pipe 5 is lined with the lining material 1 composed of the liner base material 2 and the outer surface covering material layer 3a outside thereof.

  As described above, when the lining material 1 has a configuration in which the outer surface covering material layer 3a is sheathed on the liner base material 2, the outer surface covering material layer 3a is interposed between the existing pipe 5 and the liner base material 2, and the existing pipe 5 to prevent the liner base material 2 from being cooled in a low temperature environment. Therefore, the thermoplastic material constituting the thermoplastic filament of the liner substrate 2 can be sufficiently heated and melted.

(Tubular lining material)
Next, a specific form of the tubular lining material used in the existing pipe rehabilitation method will be described with reference to FIGS.

  As shown in FIG. 1, the lining material 1 includes a liner base material 2 made of a fiber-reinforced composite material including thermoplastic filaments and reinforcing fiber filaments, and an outer surface covering material layer 3 a that covers the liner base material 2. ing.

  The liner base material 2 is a flexible tubular fabric, and is formed of a composite material composed of thermoplastic filaments and reinforcing fiber filaments. There are a wide variety of combinations of the thermoplastic filament resin, which is the base material of the composite material, and the reinforcing fiber filament, which is the reinforcing material. Typical thermoplastic filament resin materials include, for example, polypropylene, polyethylene, polyethylene terephthalate, or polybutyl terephthalate. Moreover, as a reinforcing fiber filament, glass fiber, carbon fiber, etc. are preferable.

  The liner base material 2 is constituted by a fiber bundle in which such thermoplastic filaments are placed in a reinforcing fiber filament bundle in a fiber form as a base resin, and is formed into a tubular shape by stitching or the like as a knitted fabric or a woven fabric. Has been. Further, the liner base material 2 may be configured not only by the thickness of the fabric itself formed of the fiber reinforced composite material but also by ensuring a predetermined thickness by overlapping a plurality of fabrics. .

  The outer surface covering material layer 3 a has an outer diameter smaller than the inner diameter of the existing pipe 5. Further, the outer surface covering material layer 3 a has a layer made of a thermoplastic material having a melting point higher than the melting point of the thermoplastic material constituting the thermoplastic filament of the liner substrate 2.

  In the illustrated embodiment, the outer surface covering material layer 3a has a two-layer structure, and an inner heat insulating layer 31 formed of a thermoplastic material having a melting point higher than the melting point of the thermoplastic material of the thermoplastic filament, and the inner heat insulating layer. And an outer water shielding layer 32 made of a water-impermeable material.

  In the outer covering material layer 3a having a two-layer structure, the inner heat insulating layer 31 provides a heat insulating action against the low temperature environment in the existing pipe 5 between the existing pipe 5 and the liner base material 2, and the outer water shielding layer 32 is provided. Performs a water-blocking action against intruding water in the existing pipe 5. The thermoplastic material used for the inner heat insulating layer 31 may be any thermoplastic material as long as it has a melting point higher than the melting point of the thermoplastic material constituting the thermoplastic filament of the liner substrate 2. For example, various resin materials such as high density or low density polyethylene, polypropylene, polyvinyl chloride, cellulose acetate, polybutene, or polyethylene terephthalate can be used.

  For example, when the thermoplastic filament of the liner substrate 2 is made of polypropylene (melting point is 170 ° C. or lower), polyethylene terephthalate having a melting point of 230 ° C. or higher can be used for the inner heat insulating layer 31. In this case, the inner heat insulating layer 31 can be formed of a woven fabric, a braided fabric, a knitted fabric, a felt, a nonwoven fabric, or the like using polyethylene terephthalate fibers.

  Here, the melting point of general polypropylene is 160 to 170 ° C., whereas the melting point of general polyethylene terephthalate is about 265 ° C. Therefore, the melting point of the constituent material of the inner heat insulating layer 31 of the outer surface covering material layer 3a is higher than the melting point of the constituent material of the thermoplastic filament of the liner substrate 2. Moreover, since the heating temperature of the above-described heating device 6 used in the rehabilitation process of the existing pipe 5 is about 230 ° C. at the maximum and becomes 200 to 220 ° C. during normal use, the melting point is higher than the heating temperature. Polyethylene terephthalate is suitable as a constituent material of the inner heat insulating layer 31.

  Further, for example, when the thermoplastic filament of the liner base material 2 is made of high-density or low-density polyethylene (melting point is 140 ° C.), polyethylene terephthalate having a melting point of 230 ° C. or more is similarly used for the inner heat insulating layer 31. can do. In this case, since the melting point of the thermoplastic filament of the liner substrate 2 is lower than that of the polypropylene, the heating temperature for the thermoplastic filament can be lowered, and the heating temperature in the heating step can be lowered. As a result, work safety can be improved.

  For example, when the thermoplastic filament of the liner substrate 2 is made of polyethylene terephthalate (melting point is 260 ° C. or less), the inner heat insulating layer 31 is made of a woven or non-woven fabric made of cellulose acetate fiber having a melting point of 280 ° C. or more. Can be formed.

  The outer water shielding layer 32 as an outer layer of the inner heat insulating layer 31 is made of a water-impermeable material, and further has flexibility so as to follow the difference in the radius of curvature at the bent portion of the existing pipe 5. It is said that The constituent material of the outer water-impervious layer 32 is not particularly limited as long as it is a material having water impermeability and flexibility, and is preferably a film material or a sheet material. For example, polyethylene, polypropylene, nylon, polyester, polyvinyl chloride, elastomer, synthetic rubber, or the like, or a synthetic resin material showing a low elastic modulus at room temperature of 25 to 30 ° C. is used as a constituent material of the outer water shielding layer 32. Can do.

  When the space between the manholes M1 and M2 closest to the repair target portion is short, the lining material 1 is arranged with the outer surface covering material layer 3a on the outer surface side of the liner base material 2, and the liner base material 2 and the outer surface covering material layer. It is possible to insert it into the existing pipe 5 in a state where it is combined with 3a. When the interval between the manholes M1 and M2 is long, it is preferable that the liner base material 2 is inserted inside the existing pipe 5 and the outer surface covering material layer 3a after the outer surface covering material layer 3a is inserted into the existing pipe 5. , Each can be placed in a proper position.

  In such a lining material 1, the liner base material 2 and the outer surface covering material layer 3 a are configured as described above, whereby the existing pipe 5 that has deteriorated can be suitably lined. That is, the inner heat insulating layer 31 prevents the liner base material 2 from being cooled by the low temperature environment in the existing pipe 5 where intrusion water or the like exists, prevents heat loss during heating, and sufficiently raises the liner base material 2. Makes it possible to warm. Moreover, the outer side water-impervious layer 32 prevents the liner base material 2 from being cooled by being in contact with intrusion water or the like. Therefore, in the heating process, the outer surface covering material layer 3a exhibits both heat insulating performance and water shielding performance, thereby heating substantially the entire thermoplastic filament constituting the liner base material 2 substantially uniformly. Can do.

  As a result, the heating to the lining material 1 is made uniform, and the entire thermoplastic filament of the liner base material 2 can be melted in a relatively short time. The reinforcing fiber is contained in the thermoplastic material (plastic material). The construction time (heating time) for obtaining the configuration in which the filaments are dispersed over the entire lining material 1 can be shortened. In addition, the uniform heating of the lining material 1 prevents the thermoplastic filament from remaining undissolved, and prevents a portion of the thermoplastic filament from being overheated and flowing.

  The outer surface covering material layer 3 a is formed on the inner heat insulating layer 31 made of a thermoplastic material having a melting point higher than the melting point of the thermoplastic material constituting the thermoplastic filament, and on the outer peripheral side of the inner heat insulating layer 31, and is impermeable to water. As long as the structure includes the outer water-impervious layer 32 made of a conductive material, not only the two-layer structure as described above, but also three or more layers may be formed. The outer surface covering material layer 3a may have a configuration in which a heat insulating layer for the liner base material 2 is provided on the outer side and a water shielding layer is provided on the inner side. Further, by providing the outer surface covering material layer 3a with heat insulation and water shielding action between the existing pipe 5 and the liner base material 2, the liner base material can be sufficiently obtained without using the auxiliary pig 62 of the heating device 6. It is also possible to heat 2.

  As shown in FIG. 4, the lining material 1 may be provided with a coating layer 21 made of a thermoplastic resin film or the like on the inner surface of the liner base material 2. FIG. 4 is a cross-sectional view showing a modified example of the lining material 1 and an example in which a coating layer 21 is provided.

  In this case, the coating layer 21 is formed in a cylindrical shape and is inserted in advance on the inner peripheral surface of the liner substrate 2. The coating layer 21 is fused and integrated with the inner peripheral surface of the liner substrate 2 by passing through the heating step and the diameter expansion step with the coating layer 21 inserted into the liner substrate 2. The coating layer 21 covers the inner peripheral surface of the liner base material 2 to form a smooth surface, and improves water shielding and water flow.

  As a method for integrating such a coating layer 21 with the liner base material 2, a tube-shaped coating layer 21 is used instead of the diameter expansion tube 81 which is a diameter expansion means of the lining material 1. It is also possible to take a method that also serves as a diameter step. That is, the inner surface covering material formed in a tube shape as the covering layer 21 is inserted into the inner surface of the liner base material 2 while being inverted so that the inner peripheral surface of the inner surface covering material becomes the outer peripheral side by fluid pressure, By expanding the diameter, the liner base material 2 is integrated. Thereby, it becomes possible to form the coating layer 21 on the inner peripheral surface of the liner base material 2 at the same time as performing the diameter expanding step.

<Embodiment 2>
Next, a tubular lining material according to Embodiment 2 of the present invention will be described. FIG. 5 is a cross-sectional view showing the lining material 1 according to the second embodiment, and FIG. 6 is a cross-sectional view showing a state in which the existing pipe 5 is lined using the lining material 1 according to the second embodiment.

  In the first embodiment, the outer covering material layer 3a having a two-layer structure in the lining material 1 is shown. However, in the present embodiment, an example in which the outer covering material layer 3a is a single layer is shown. Since the configuration of the liner base material 2 of the lining material 1 is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are used and detailed description thereof is omitted.

  As shown in FIG. 5, the outer surface covering material layer 3a of the lining material 1 is formed of a tubular body made of a single layer. The outer surface covering material layer 3 a includes a thermoplastic resin layer 33 made of a thermoplastic material having a melting point higher than that of the constituent material of the thermoplastic filament of the liner substrate 2.

  As a constituent material of the thermoplastic resin layer 33, a foamed molded article having closed cells such as a vinyl chloride resin and a urethane resin having a high heat insulating effect can be used. For example, a polyethylene terephthalate resin foam sheet material is preferable. In the case of this polyethylene terephthalate resin foamed sheet material, the melting point is 240 ° C. and the thermal conductivity is 0.03 W / (m · K). As the thermoplastic resin layer 33, a polyethylene terephthalate resin foamed sheet material having a thickness of 0.9 mm can be used.

  FIG. 6 shows a state where the lining material 1 has undergone a heating process and a diameter expansion process. The outer surface covering material layer 3a made of such a thermoplastic resin layer 33 is not melted even in the heating process of the liner liner 2 incorporated therein, and the influence of the liner substrate 2 from the low temperature environment in the existing pipe 5 is exerted. To allow sufficient heating and temperature rise. In addition, since the outer surface covering material layer 3a itself has a water-impervious property, the intruding water and the like are prevented from entering the outer surface covering material layer 3a even when there is intruded water or the like in the existing pipe 5.

  As a result, the lining material 1 can substantially uniformly heat the entire thermoplastic filament constituting the liner base material 2 in the heating step, and the thermoplasticity of the liner base material 2 can be achieved in a relatively short time. The entire filament can be melted, and the construction time for obtaining the configuration in which the reinforcing fiber filament is dispersed in the thermoplastic material over the entire lining material 1 can be shortened. Moreover, since the outer surface covering material layer 3a is composed of a single layer, the material has good moldability, is easy to handle, and can increase productivity.

  Furthermore, as a modification of the outer surface covering material layer 3a, a thermoplastic resin layer 33 made of a material containing a heat generating agent that reacts with water and generates heat may be provided. In this case, the outer surface covering material layer 3 a can heat the liner base material 2 by generating heat between the existing pipe 5 and the liner base material 2. As the exothermic agent that reacts with water, for example, calcium chloride or the like can be used.

  In this case, the outer surface covering material layer 3a is formed in a cylindrical shape using a nonwoven fabric made of a thermoplastic material in which a heat generating agent is uniformly dispersed. Furthermore, it is preferable that a thin film having a low strength and a low melting point is laminated on both the front and back surfaces of the outer covering material layer 3a. Thereby, while ensuring the exothermic property of the outer surface covering material layer 3a and the easiness of construction to the existing pipe 5, the existing thin film can exhibit the water shielding property and the existing pipe 5 can be suitably used without deteriorating workability. Can be rehabilitated. Moreover, the liner base material 2 can be heated also from the outer peripheral surface side by the outer surface covering material layer 3a, and the aged existing pipe 5 can be rehabilitated safely and efficiently.

<Embodiment 3>
Next, a tubular lining material according to Embodiment 3 of the present invention will be described. FIG. 7 is a cross-sectional view showing the lining material 1 according to Embodiment 3, and FIG. 8 is a cross-sectional view showing a state in which the existing pipe 5 is lined using the lining material 1 of FIG. FIG. 9 is an explanatory view schematically showing a rehabilitation method for lining the inner wall of the existing pipe 5 using the lining material 1 of FIG.

  In the first and second embodiments, the configuration in which the outer surface coating material layer 3a is externally provided on the liner base material 2 of the lining material 1 has been described, but in this embodiment, the inner surface coating that is the coating layer 3 on the inner surface of the liner base material 2 An example in which the material layer 3b is provided will be described. Since the configuration of the liner base material 2 of the lining material 1 is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are used and detailed description thereof is omitted.

  As shown in FIG. 7, the lining material 1 includes an inner surface coating material layer 3 b as the coating layer 3. The inner surface covering material layer 3b is a cylindrical body built in the liner base material 2, covers the inner surface of the liner base material 2, and has a melting point higher than the melting point of the constituent material of the thermoplastic filament of the liner base material 2. Made of thermoplastic material. Thereby, in the heating process of the lining material 1, it is possible to melt the liner base material with the heat applied to the lining material 1, and then melt or soften the inner surface covering material layer 3b embedded in the liner base material 2. It becomes. The liner base material 2 and the inner surface covering material layer 3b do not necessarily have to be integrated, but are appropriately combined and melted and integrated by a heating step and a diameter expansion step.

  The inner surface covering material layer 3b also has air permeability. In order to provide the inner surface covering material layer 3b with air permeability, it is preferable to form the inner surface covering material layer 3b using a porous body such as a woven fabric, a braided fabric, a knitted fabric, a felt, or a nonwoven fabric. Thereby, the inner surface covering material layer 3b can pass heat, air, moisture, and the like through a weave such as a woven fabric or a gap between fibers. In this case, the inner surface covering material layer 3b can be sewn and fixed to the inner surface of the liner base material 2 which is a tubular fabric.

  Such an inner surface covering material layer 3 b does not hinder the heating action on the liner base material 2 in the heating step of the lining material 1. That is, heating steam or the like applied from the inner surface side of the lining material 1 passes through the inner surface coating material layer 3b and heats the liner substrate 2 as well. At this time, only the thermoplastic material of the liner substrate 2 can be melted by setting the heating temperature corresponding to the constituent material of the thermoplastic filament of the liner substrate 2. Further, after melting the thermoplastic material of the liner base material 2, the heating temperature can be further raised to subsequently melt or soften the inner surface covering material layer 3 b, and this heating closes the gap between the inner surface covering material layers 3 b. Thus, the liner substrate 2 is covered.

  The inner surface covering material layer 3b may be composed of a perforated sheet material or a perforated film material having a large number of openings. In this case, the inner surface covering material layer 3b can pass heat, air, moisture, and the like through a large number of openings, and thus does not hinder heating of the liner base material 2. Further, by melting the inner surface covering material layer 3b in the heating step, the opening of the inner surface covering material layer 3b is closed to cover the liner base material 2.

  The inner surface covering material layer 3b is not limited to a plastic material as long as it is a thermoplastic material having a melting point higher than the melting point of the constituent material of the thermoplastic filament of the liner base material 2 and has air permeability. For example, an elastomer such as rubber can be used as a constituent material.

When the lining material 1 is heated from the inner surface side, if the air permeability of the inner surface coating material layer 3b is too small, natural air can hardly enter and exit, and there is a possibility that heating to the liner base material 2 may be hindered. When the air permeability of the layer 3b is too large, the void portion becomes large and the protective effect on the liner substrate 2 is lowered. Therefore, as the air permeability required for such an inner surface covering material layer 3b, the Frazier air permeability before heating and melting measured by the Frazier type test method specified in JIS L 1096 is 1000 to 30000 cm ³ / cm ² · min. It is desirable that

Further, in order to suitably coat the lining layer of the liner base material 2 with the inner surface covering material layer 3b and to ensure water tightness and corrosion resistance, the inner surface covering material layer 3b has a volume per unit area of 0 after heating and melting. 0.003 to 0.05 cm ³ / cm ² is desirable.

  The structural example of the liner base material 2 and the inner surface covering material layer 3b in the lining material 1 is shown below.

(Configuration example 1)
The liner substrate 2 is composed of a composite material of thermoplastic filaments made of polypropylene (melting point 160 ° C.) and glass fiber filaments as a reinforcing material.

On the other hand, the inner surface covering material layer 3b is formed using a polyethylene terephthalate nonwoven fabric, and has a thickness of 0.5 mm and an air permeability of 3000 cm ³ / cm ² · min. The melting point of polyethylene terephthalate is approximately 250 to 260 ° C., which is higher than that of the thermoplastic material of the liner substrate 2.

(Configuration example 2)
The liner substrate 2 is composed of a composite material of thermoplastic filaments made of polypropylene (melting point 160 ° C.) and glass fiber filaments, as in the configuration example 1.

On the other hand, the inner surface covering material layer 3b is formed using a plain woven fabric of polypropylene. Here, even if the constituent material of the inner surface covering material layer 3b is the same material as the thermoplastic material (polypropylene) of the liner substrate 2, the melting point is 165 to 170 ° C., which is higher than that of the thermoplastic material of the liner substrate 2. A high polypropylene may be selected. The inner surface covering material layer 3b has a thickness of 0.8 mm and an air permeability of 20000 cm ³ / cm ² · min.

(Configuration example 3)
The liner substrate 2 is composed of a composite material of thermoplastic filaments made of polypropylene (melting point 160 ° C.) and glass fiber filaments, as in the configuration example 1.

On the other hand, the inner surface covering material layer 3b is formed using a fiber bundle material of polypropylene (melting point: 165 to 170 ° C.). The inner surface covering material layer 3b has a thickness of 0.83 m and an air permeability of 5000 cm ³ / cm ² · min.

(Configuration example 4)
The liner substrate 2 is composed of a composite material of thermoplastic filaments made of polypropylene (melting point 160 ° C.) and glass fiber filaments, as in the configuration example 1.

On the other hand, the inner surface covering material layer 3b is formed using a perforated sheet material of nylon 6 (melting point 220 to 225 ° C.). The inner surface covering material layer 3b has a thickness of 0.6 m and an air permeability of 10,000 cm ³ / cm ² · min.

  With the lining material 1 configured in this manner, the existing pipe 5 after rehabilitation is improved in corrosion resistance against a fluid containing an acidic component such as sewage, and there is no risk of strength reduction due to corrosion. It can be maintained in a good condition in the long term.

(Rehabilitation method for existing pipes)
The method of rehabilitating the existing pipe 5 using the lining material 1 according to the third embodiment is similarly performed through the respective steps described in the first embodiment. That is, as shown in FIG. 9, the lining material 1 is inserted into a repair target portion of the existing pipe 5, and the heating device 6 as a heating unit is installed.

  In this case, the heating device 6 is arranged to heat the lining material 1 from both the inside and outside. That is, the lining pig 61 is disposed inside the inner surface covering material layer 3 b, and the cylindrical auxiliary pig 62 is disposed outside the liner substrate 2. The lining pig 61 heats the lining material 1 with heating steam or the like from the inner peripheral side of the inner surface covering material layer 3b, and melts the thermoplastic filament of the liner base material 2. Further, the auxiliary pig 62 heats the outer peripheral surface of the liner substrate 2 and assists the melting of the thermoplastic filament from the outer peripheral side (heating step). The heating means is not limited to this, and various heating means such as heating with heated gas, steam, infrared rays, etc., and bag materials that are heated and expanded can be used.

  In this heating step, heating is performed at a temperature lower than the melting point of the thermoplastic material of the inner surface covering material layer 3 b in the lining material 1. Thereby, the thermoplastic filament of the liner base material 2 can be melted without melting the inner surface covering material layer 3b. And the liner base material 2 forms the fiber reinforced resin layer which mixed the reinforcing fiber filament.

  Next, the heating temperature is increased, and heating is performed at a temperature equal to or higher than the melting point of the thermoplastic material constituting the inner surface covering material layer 3b. Thereby, the inner surface covering material layer 3b is melted. When the inner surface covering material layer 3b is melted, the gap or opening of the inner surface covering material layer 3b is closed, so that the melted inner surface covering material layer 3b covers and protects the inner surface of the liner base material 2.

  Moreover, substantially the whole thermoplastic filament which comprises the liner base material 2 can be heated substantially uniformly by such a heating process. As a result, the heating to the lining material 1 is made uniform, and the entire thermoplastic filament of the liner base material 2 can be melted in a relatively short time. The reinforcing fiber is contained in the thermoplastic material (plastic material). The construction time (heating time) for obtaining the configuration in which the filaments are dispersed over the entire lining material 1 can be shortened. In addition, the uniform heating of the lining material 1 prevents the thermoplastic filament from remaining undissolved, and prevents a portion of the thermoplastic filament from being overheated and flowing.

  The lining material 1 linings the inner wall of the existing pipe 5 through the diameter expansion process and the cooling process after the heating process. The renewed existing pipe 5 is not exposed because the lining layer of the liner base material 2 is covered with the inner surface covering material layer 3b and is not exposed to the fluid in the pipe. Therefore, the existing pipe 5 rehabilitated by such a lining material 1 has improved corrosion resistance against fluids containing acidic components such as sewage, and there is no risk of strength reduction due to wear or corrosion. It is possible to maintain in a good state.

  The tubular lining material 1 and the existing pipe rehabilitation method according to the present invention can be implemented in various other forms besides the above-described embodiment. For example, the outer surface covering material layer 3a in the lining material 1 is not limited to the above embodiment, and may be a single layer or a multilayer structure of two layers, three layers or more. Further, the inner surface covering material layer 3b may be composed of a mixture of two or more kinds of thermoplastic materials, or may be a composite material of a thermoplastic material and an inorganic material. As shown in FIG. 10, the lining material 1 may be configured to include both an outer surface covering material layer 3 a and an inner surface covering material layer 3 b as the covering layer 3 of the liner base material 2. Therefore, the above embodiment is merely an example and is not limited.

  The present invention can be suitably used when the inner surface of an existing pipe is lined and rehabilitated.

DESCRIPTION OF SYMBOLS 1 Tubular lining material 2 Liner base material 3 Coating layer 3a Outer surface coating material layer 31 Inner heat insulation layer 32 Outer water shielding layer 33 Thermoplastic resin layer 3b Inner surface coating material layer 5 Existing pipe 6 Heating device 61 Lining pig 62 Auxiliary pig 8 Reversing machine 81 Diameter expansion tube 9 Winch 91 Traction wire M1, M2 Manhole

Claims (18)

A tubular lining material for lining the inner wall of an existing pipe,
A liner base material of a tubular fabric made of a composite material including a thermoplastic filament and a reinforcing fiber filament;
A tubular lining material comprising: a coating layer that covers the liner substrate and contains a thermoplastic material having a melting point higher than the melting point of the thermoplastic material constituting the thermoplastic filament. The tubular lining material according to claim 1,
The coating layer is
A tubular lining material, characterized in that it is a cylindrical outer surface covering material layer that is sheathed on the liner base material and has an outer diameter smaller than the inner diameter of an existing pipe. The tubular lining material according to claim 2,
The outer surface covering material layer has a multilayer structure in which a plurality of layers are integrated,
The tubular lining material characterized by including the inner side heat insulation layer which is formed with the said thermoplastic material, and has heat insulation, and the outer side water shielding layer which is formed in the outer peripheral side of this inner heat insulation layer, and consists of a water-impermeable material. The tubular lining material according to claim 3,
The outer surface covering material layer is a tubular lining material, wherein the inner heat insulating layer is made of any one of woven fabric, braided fabric, knitted fabric, felt, or non-woven fabric. The tubular lining material according to claim 4,
The inner lining layer is made of a polyethylene terephthalate fiber or a cellulose acetate fiber, and is a tubular lining material. The tubular lining material according to claim 3,
The outer surface covering material layer is a tubular lining material, wherein the inner heat insulating layer is a foamed molded body having closed cells. In the tubular lining material according to any one of claims 3 to 6,
The said outer surface covering material layer consists of a water-impermeable film material in which the said outer side water shielding layer has a softness | flexibility, The tubular lining material characterized by the above-mentioned. The tubular lining material according to claim 7,
The outer lining layer is formed of a synthetic resin material having a low elastic modulus at room temperature. The tubular lining material according to claim 2,
The outer surface coating layer is a heat generating tubular body containing a heat generating agent that reacts with water, and generates heat between an existing tube and a liner base material to heat the liner base material. . The tubular lining material according to claim 9,
The exothermic tubular body includes a layer made of any one of a woven fabric, a braided fabric, a knitted fabric, a felt, or a non-woven fabric in which the exothermic agent is uniformly dispersed. Wood. The tubular lining material according to claim 1,
The coating layer is
A tubular lining material characterized in that it is a cylindrical inner surface covering material layer that is built in the liner base material and has air permeability with gaps or openings, while the gaps or openings can be closed by heating and melting. . The tubular lining material according to claim 11,
The inner surface covering material layer is made of any one of a woven fabric, a braided fabric, a knitted fabric, a felt, and a non-woven fabric. The tubular lining material according to claim 11,
The tubular inner lining material, wherein the inner surface covering material layer is made of a perforated sheet material or a perforated film material. In the tubular lining material according to any one of claims 11 to 13,
The inner lining material layer has a fragile air permeability before heating and melting of 1000 to 30000 cm ³ / cm ² · sec, a tubular lining material. In the tubular lining material according to any one of claims 11 to 14,
The inner surface covering material layer has a volume per unit area after heating and melting of 0.003 to 0.05 cm ³ / cm ² . A method for rehabilitating an existing pipe, which is renovated by forming a lining layer of a tubular lining material on the inner wall of the existing pipe,
The tubular lining material has a liner base material composed of a composite material including a thermoplastic filament and a reinforcing fiber filament, and a melting point higher than the melting point of the thermoplastic material that covers the liner base material and constitutes the thermoplastic filament. A coating layer comprising a thermoplastic material that is,
An insertion process of inserting and arranging this tubular lining material in a repair target location in an existing pipe;
A heating step of disposing heating means on the inside or outside of the tubular lining material, or both inside and outside, and heating or softening or melting the tubular lining material while moving the heating means;
A diameter expansion step of forming a lining layer in which the liner base material and the coating layer are integrated by pressurizing the expanded or softened tubular lining material from the inside by a diameter expansion means,
A method of rehabilitating the existing pipe, comprising: cooling the molded lining layer and curing the inner lining of the existing pipe. In the rehabilitation method of the existing pipe according to claim 16,
In the heating step, the liner base material is softened by heating at a temperature lower than the melting point of the thermoplastic material of the coating layer, and then the heating temperature is raised to melt or soften the coating layer. How to rehabilitate tubes. In the rehabilitation method of the existing pipe according to claim 16,
The tubular lining material has a configuration in which the coating layer is built in a liner base material,
In the insertion step, first, the liner base material is disposed in the existing pipe, and then fluid pressure is applied to the coating layer so that the inner peripheral surface of the coating layer is reversed so that the inner peripheral surface is on the outer peripheral side. A method for rehabilitating an existing pipe, wherein the pipe is inserted inside a liner base material.

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