JP4956414B2 - Manufacturing method of lining material - Google Patents

Description

  The present invention relates to a method for manufacturing a lining material used when rehabilitating existing pipes such as aging sewer pipes, power pipes, and communication pipes.

  Conventionally, a lining pipe made of a thermoplastic resin such as vinyl chloride, which is smaller in diameter than the inner diameter of the existing pipe and recovers the shape of the circular pipe at the shape memory temperature, is inserted into the existing pipe buried in the ground, A rehabilitation method in which a lining pipe is heated to expand its diameter and restored to a circular pipe shape, and then the lining pipe is brought into close contact with the inner peripheral surface of an existing pipe has been proposed and widely implemented (for example, Patent Documents) 1).

Such a lining pipe is formed by extruding a thermoplastic resin into a tubular shape, cooling to a temperature below the glass transition temperature of the thermoplastic tree material, and then reheating to a temperature above the glass transition temperature of the thermoplastic tree material. Then, it is manufactured by bending and deforming so that the cross-sectional diameter becomes small (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 11-230212 JP 2003-112358 A

  In such an existing pipe rehabilitation method, when the lining pipe is lined while running water such as infiltration water or unknown water is flowing through the existing pipe, the lining pipe is cooled by contact with the running water. In the process of heating the pipe, the temperature rise may be insufficient. If the temperature rise due to heating of the lining pipe is insufficient, when the lining pipe is restored to the shape of a circular pipe, or the softened lining pipe is pressurized to expand and expand to adhere to the inner peripheral surface of the existing pipe At that time, there is a high possibility that the finished state will be incomplete.

  For this reason, the rehabilitation method described above cannot be performed in an environment where flowing water flows down the existing pipe, and it is necessary to bypass the flowing water so that it does not contact the lining pipe. Specifically, it is necessary to carry out a water change operation for laying a bypass pipe on the road between the start side manhole and the arrival side manhole across the existing pipe to be lined to bypass the running water. As a result, there is a problem that the rehabilitation work not only takes time, but also causes traffic congestion due to traffic restrictions associated with the laying of bypass piping.

  Therefore, in order to prevent cooling of the lining pipe due to running water, it has been proposed to draw a heat insulation layer into the existing pipe prior to drawing the lining pipe into the existing pipe, but after inserting the heat insulation layer, insert the lining pipe. Therefore, the drawing-in process becomes two stages, and the working time is greatly increased.

  On the other hand, in order to draw the lining pipe and the heat insulation layer into the existing pipe at the same time, it is necessary to cover the lining pipe with the heat insulation layer prior to drawing into the existing pipe, but the lining pipe is wound around the take-up drum. Therefore, it is very difficult to cover a tubular heat insulating layer on a long continuous lining pipe at the construction site.

  In addition, when manufacturing a lining pipe, it may be possible to cover the lining pipe with a heat insulating layer formed in a tubular shape. On the other hand, only the heat insulating layer on the outer peripheral side is wound while sliding, and there is a problem that wrinkles are generated in the heat insulating layer and the winding cannot be smoothly performed. Furthermore, when the heat insulation layer is wound around the winding drum together with the lining pipe, the width of the tubular heat insulation layer becomes larger than the width of the bent lining pipe, and the heat insulation layer protrudes from the edge of the lining pipe, The protruding part of the heat insulation layer may be rolled up or bent, causing tearing or breakage.

  The present invention has been made in view of such problems, and even in an environment where running water flows down the existing pipe, it is surely heated to the required temperature to ensure the quality of the existing pipe and rehabilitate. It is possible to provide a manufacturing method capable of continuously winding and continuously manufacturing a lining material comprising a pipe body made of a thermoplastic resin and a heat insulating layer placed on the pipe body. .

  The method for producing a lining material according to the present invention includes forming a tubular pipe body by extruding a thermoplastic resin material, cooling the pipe body to a temperature lower than the glass transition temperature of the thermoplastic resin material, The body is reheated to a temperature equal to or higher than the glass transition temperature of the thermoplastic resin material, and then an adhesive is applied to the pipe body, and then a sheet-like heat insulating layer is formed into a tubular shape and covered with the pipe body. The pipe body is bent and deformed so that its cross-sectional diameter is reduced, and at the same time, the heat insulating layer is deformed along the pipe body and bonded to the pipe body via an adhesive, and the pipe body is bent and deformed, and the pipe body The heat-insulating layer bonded in a deformed state is wound up.

  According to the present invention, a thermoplastic resin material is extruded to form a tubular pipe body, the pipe body is cooled to a temperature not higher than the glass transition temperature of the thermoplastic resin material, and a shape memory is stored in the pipe body. After maintaining the action, the pipe body is reheated until the temperature becomes equal to or higher than the glass transition temperature of the thermoplastic resin material. Next, after applying an adhesive to the pipe body, a sheet-like heat insulation layer is formed into a tubular shape and covered with the pipe body, and then the pipe body is bent and deformed so that its cross-sectional diameter is reduced, and at the same time, the heat insulation layer is formed. The pipe body is deformed and bonded to the pipe body via an adhesive. Thereafter, the bent pipe body and the heat insulating layer bonded in a deformed state along the pipe body are wound up.

  As a result, the lining material comprising the pipe main body and the heat insulating layer placed on the pipe main body can be reliably wound and continuously manufactured without the heat insulating layer being displaced from the pipe main body.

  And when rehabilitating an existing pipe with such a lining material, the construction time can be greatly shortened compared with the case of drawing in the existing pipe in the order of the heat insulation layer and the pipe body, and the flowing water flows down the existing pipe. Because the pipe body can prevent the pipe body from coming into contact with running water even in an environment where heat is applied, rehabilitation work can be performed without water change work, and the lining material can be heated sufficiently to insulate it. The diameter can be expanded together with the layer and brought into close contact with the existing pipe, and the existing pipe can be rehabilitated with a lining material that ensures the finished quality.

  Here, examples of the thermoplastic resin of the pipe body constituting the lining material include hard vinyl chloride resin, polyethylene, and polypropylene.

  In addition, examples of the heat insulation layer include foams of thermoplastic resins such as hard vinyl chloride resin, polyurethane resin, and polyethylene resin, nonwoven fabrics, woven fabrics, films, and the like corresponding to the material of the pipe body.

  In this case, the heat insulating layer is preferably formed of a foam or a water-impermeable material laminated on the foam and its outer peripheral surface. As a result, the heat insulation layer can be reduced in weight, and the foam bubbles can be easily crushed when the lining material is pressed, reducing the thickness of the lining material. Can be secured.

  The foam bubbles may be closed cells or continuous bubbles in which the bubbles communicate with each other. However, in the case of the open cells, in order to prevent a decrease in heat insulation performance due to absorption of running water into the open cells. It is necessary that an impermeable layer is laminated on the outer peripheral surface of the foam.

  Here, examples of the water-impermeable material include hard vinyl chloride resin, polyethylene resin, and polyethylene terephthalate resin.

  In the present invention, it is preferable that the pipe body is folded into a U-shaped section, and at the same time, the heat insulating layer is folded into a U-shaped section along the pipe body, and bonded to each other at the concave bottom portion via an adhesive. Accordingly, the heat insulating layer can be held without protruding from the concave portion of the pipe body folded in a U shape, and when the lining material L having a U-shaped cross section composed of the pipe main body and the heat insulating layer is wound, the pipe main body It can be reliably prevented that the heat insulating layer protrudes and rises or bends and breaks or breaks.

  The method for producing a lining material according to the present invention includes forming a tubular pipe body by extruding a thermoplastic resin material, cooling the pipe body to a temperature lower than the glass transition temperature of the thermoplastic resin material, Reheat the main body until it reaches the glass transition temperature or higher of the thermoplastic resin material, then bend and deform the pipe body so that its cross-sectional diameter is small, and then apply adhesive to the bent pipe body Then, after forming a sheet-like heat insulating layer into a tubular shape and covering the pipe body, the heat insulating layer is deformed along the bent pipe body and bonded to the pipe body with an adhesive, and then bent. The deformed pipe body and the heat insulating layer bonded in a deformed state along the pipe body are wound up.

  According to the present invention, a thermoplastic resin material is extruded to form a tubular pipe body, the pipe body is cooled to a temperature not higher than the glass transition temperature of the thermoplastic resin material, and a shape memory is stored in the pipe body. After maintaining the action, the pipe body is reheated until the temperature becomes equal to or higher than the glass transition temperature of the thermoplastic resin material. Next, the pipe body was bent and deformed so as to reduce its cross-sectional diameter, and then an adhesive was applied to the bent pipe body, and then a sheet-like heat insulating layer was formed into a tubular shape and covered with the pipe body. Then, the heat insulating layer is deformed along the bent pipe body and bonded to the pipe body via an adhesive. Thereafter, the bent pipe body and the heat insulating layer bonded in a deformed state along the pipe body are wound up.

  As a result, the lining material comprising the pipe main body and the heat insulating layer placed on the pipe main body can be reliably wound and continuously manufactured without the heat insulating layer being displaced from the pipe main body.

  And when rehabilitating an existing pipe with such a lining material, the construction time can be greatly shortened compared with the case of drawing in the existing pipe in the order of the heat insulation layer and the pipe body, and the flowing water flows down the existing pipe. Because the pipe body can prevent the pipe body from coming into contact with running water even in an environment where heat is applied, rehabilitation work can be performed without water change work, and the lining material can be heated sufficiently to insulate it. The diameter can be expanded together with the layer and brought into close contact with the existing pipe, and the existing pipe can be rehabilitated with a lining material that ensures the finished quality.

  Here, examples of the thermoplastic resin of the pipe body constituting the lining material include hard vinyl chloride resin, polyethylene, and polypropylene.

  In addition, examples of the heat insulation layer include foams of thermoplastic resins such as hard vinyl chloride resin, polyurethane resin, and polyethylene resin, nonwoven fabrics, woven fabrics, films, and the like corresponding to the material of the pipe body.

  In this case, the heat insulating layer is preferably formed of a foam or a water-impermeable material laminated on the foam and its outer peripheral surface. As a result, the heat insulation layer can be reduced in weight, and the foam bubbles can be easily crushed when the lining material is pressed, reducing the thickness of the lining material. Can be secured.

  The foam bubbles may be closed cells or continuous bubbles in which the bubbles communicate with each other. However, in the case of the open cells, in order to prevent a decrease in heat insulation performance due to absorption of running water into the open cells. It is necessary that an impermeable layer is laminated on the outer peripheral surface of the foam.

  Here, examples of the water-impermeable material include hard vinyl chloride resin, polyethylene resin, and polyethylene terephthalate resin.

  In the present invention, it is preferable that after the pipe body is folded into a U-shaped section, the heat insulating layer is folded into a U-shaped section along the pipe body and bonded to each other at the concave bottom portion via an adhesive. Accordingly, the heat insulating layer can be held without protruding from the concave portion of the pipe body folded in a U shape, and when the lining material L having a U-shaped cross section composed of the pipe main body and the heat insulating layer is wound, the pipe main body It can be reliably prevented that the heat insulating layer protrudes and rises or bends and breaks or breaks.

  ADVANTAGE OF THE INVENTION According to this invention, the lining material which consists of a pipe main body made from a thermoplastic resin and the heat insulation layer covered on this pipe main body can be reliably wound up, and can be manufactured continuously.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The manufacturing method of the lining material of this invention can be implemented with the manufacturing apparatus shown in FIG.

  The lining material L is composed of a thermoplastic resin, for example, a pipe body P made of hard vinyl chloride, and a heat insulation layer F made of hard vinyl chloride covering the pipe body P and corresponding to the pipe body P. And as the heat insulation layer F, it is formed of the foam containing a bubble inside.

  The manufacturing apparatus 1 includes an extruder 2 that heats and melts a hard vinyl chloride resin material, an extrusion mold 3 that forms the molten resin supplied from the extruder 2 into a tubular shape, and a pipe that is extruded from the extrusion mold 3. The temperature control unit 4 that cools and reheats the body P, the first take-up machine 5 that takes the pipe body P reheated by the temperature control unit 4, and the pipe body P that is taken from the first take-up machine 5 An adhesive application device 6 for applying an adhesive, a heat insulating layer forming device 7 for covering the pipe main body P coated with the adhesive to form a tubular heat insulating layer F, and the pipe main body P covering the pipe main body P A shaping device 8 that bends and deforms so as to reduce the cross-sectional diameter together with the heat insulation layer F, a second take-up machine 51 that takes up the pipe body P and the heat insulation layer F shaped by the shaping device 8, and a second take-up The pipe body P taken by the machine 51 and Main unit from winder 9 for winding the thermal insulating layer F is formed.

  Here, the extruder 2, the extrusion die 3, the temperature control unit 4, the take-up machines 5 and 51, the shaping apparatus 8, and the winder 9 constituting the manufacturing apparatus 1 are those employed in a conventionally known manufacturing apparatus. The detailed description thereof will be omitted.

  The adhesive application device 6 continuously applies the adhesive C having a certain width to the outer peripheral surface of the pipe body P over the pipe axis direction, and the application position is such that the cross-sectional diameter is reduced by the shaping device 7. The pipe body P is bent and deformed, specifically, is set corresponding to the concave bottom portion of the pipe body P folded into a U-shaped cross section.

  Further, the heat insulating layer forming device 7 feeds out the heat insulating layer F from the heat insulating layer original fabric 71 formed by winding the sheet-like heat insulating layer F into a roll shape, and is formed into a tubular shape by the forming device 72 so as to cover the pipe body P. After the formation, both ends formed in a tubular shape are joined by an end joining device 73 to form a pipe. In this case, the both ends of the heat insulating layer F can be joined using an adhesive or thermal bonding.

  In order to manufacture the lining material L using such a manufacturing apparatus 1, the hard vinyl chloride resin material is supplied to the extruder 2, the hard vinyl chloride resin material is extruded from the extrusion mold 3 into a tubular shape, and the pipe body P Is taken out by the first take-up machine 5 (see FIG. 2A). At this time, the pipe main body P is allowed to pass through the temperature control unit 4 to regulate its outer diameter, and after the pipe main body P is cooled to a temperature lower than the glass transition temperature Tg of the hard vinyl chloride resin, the glass Reheat to a temperature above the transition temperature Tg.

  On the outer peripheral surface of the reheated pipe main body P, an adhesive C having a certain width is applied over the pipe axis direction by the adhesive application device 6 (see FIG. 2B). Next, the sheet-like heat insulating layer F is fed out from the heat insulating layer raw fabric 71 of the heat insulating layer forming device 7 toward the pipe main body P to which the adhesive C is applied, and the pipe main body P is covered by the forming device 72 so as to be tubular. After the formation, both end portions of the heat insulating layer F overlapped by the end joining device 73 are joined to form a pipe (see FIG. 2C).

  Thereafter, the pipe main body P and the heat insulating layer F placed on the pipe main body P are bent and deformed by the shaping device 8 so that the cross-sectional diameter thereof is reduced. Specifically, the heat insulating layer F is folded into a U-shaped cross section, and the pipe body P is folded into a U-shaped cross section via the heat insulating layer F. And the pipe main body P and the heat insulation layer F which were shaped by the shaping apparatus 8 in the U-shaped cross section are adhere | attached through the adhesive agent C in a concave bottom part, when shaping (refer FIG.2 (d)). .

  Next, the pipe body P and the heat insulating layer F, which are formed in a U-shaped cross section and bonded through the adhesive C, are taken up as the lining material L through the second take-up machine 51, and the winder 9 Is wound around the winding drum 91 (see FIG. 2E).

  In this case, the pipe body P folded into a U-shaped section and the heat insulating layer F folded into a U-shaped section are bonded to each other at the concave bottom portion with an adhesive C. Thus, the heat insulating layer F can be reliably wound without being displaced, and the heat insulating layer F can be held without protruding from the concave portion of the pipe body P shaped in a U-shaped cross section. Therefore, when the lining material L having a U-shaped section composed of the pipe main body P and the heat insulating layer F is wound around the winding drum 91 of the winder 9, the heat insulating layer F is formed from the pipe main body P shaped in a U-shaped cross section. It is possible to reliably prevent breakage and breakage caused by protruding and curling up or bending.

  Next, a construction method for rehabilitating the existing pipe K using the lining material L manufactured in this way will be described.

  It is assumed that the flowing water flows from the upstream side to the downstream side through the existing pipe K in the construction section, that is, from the start side manhole M1 which is the start end of the construction section to the arrival side manhole M2 which is the end.

  This rehabilitation work is performed after high pressure water cleaning of the inner peripheral surface of the existing pipe K and a pipe inspection by a self-propelled television camera are performed. At this time, a wire rod such as Kevlar wire is connected to the self-propelled television camera used for the in-pipe investigation, and the wire rod is laid over the construction section.

  Next, the winch W is installed on the arrival side manhole M2 side, and the winch wire 11 and the wire material are bound, and then the wire material is wound and collected on the start side manhole M1 side, and the winch wire 11 is attached to the existing pipe K. Lay down. After that, after the winch wire 11 is bound to the pinched tip of the lining material L carried into the starting side manhole M1, the winch W is driven to wind the winch wire 11, and the lining material L is placed inside the existing pipe K. Pull in and insert (see FIG. 3). At this time, the flowing water contacts the heat insulating layer F arranged outside the lining material L and flows down in the existing pipe K. However, the pipe body P of the lining material L is arranged inside the heat insulating layer F. Therefore, the flowing water is prevented from contacting the pipe body P. .

  If the lining material L is drawn into the existing pipe K, the lining material L is extended to the manhole side by a certain length in the starting side manhole M1 and the arrival side manhole M2 in consideration of linear expansion during cooling. After cutting, the plug body 12 is attached and closed at each end, while the other end of the heat medium supply pipe 13 having one end connected to the heating steam generator G is connected to the one end side plug body 12. Then, one end of the heat medium discharge pipe 14 is connected to the other end side plug body 12.

  Next, when the heating steam generator G is driven and the heating steam is supplied to the lining material L through the heat medium supply pipe 13, the heat of the heating steam is transmitted to the lining material L. In this case, as described above, the flowing water is in contact with the heat insulating layer F, but is prevented from coming into contact with the pipe main body P disposed on the inner side thereof. It is sufficiently heated and softened from the inner peripheral surface side by the heating steam supplied to the inside, and the shape is restored to a circular tube shape. Close contact with the surface (see FIG. 4). Further, when the heating steam generator G is driven and the heating steam is supplied to the lining material L through the heat medium supply pipe 13, the pipe body P and the heat insulating layer F2 of the lining material L are integrally heated by the heating steam. Then, it is pressurized by the pressure of the heated steam, expanded and expanded in diameter, and is in close contact with the inner peripheral surface of the existing pipe K (see FIG. 5).

  At this time, the foam bubbles constituting the heat insulation layer F are compressed, thereby reducing the thickness of the heat insulation layer F, increasing the finished inner diameter of the lining material L, and reducing the flow passage cross-sectional area of the rehabilitation pipe line. While being able to suppress, adhesion | attachment of the lining material L with respect to the existing pipe K can be ensured.

  Further, the flowing water does not come into contact with the pipe body P by the heat insulating layer F, and the temperature drop of the pipe body P due to the contact of the flowing water is prevented, so that the finished quality can be ensured.

  The excessive heating steam supplied to the lining material L is discharged through the heat medium discharge pipe 14, and the internal pressure of the lining material L is maintained constant.

  If the integrated lining material L is heated and pressurized by heating steam for a set time to be in close contact with the inner peripheral surface of the existing pipe K, the heating steam generator G is stopped while a cooling medium, for example, Then, the air at normal temperature is supplied to the lining material L through the heat medium supply pipe 13 by driving a blower (not shown). By supplying normal temperature pressurized air to the lining material L, the lining material L exchanges heat with normal temperature pressurized air supplied in place of heated steam, and cools while continuing to pressurize with the pressurized air. Is done.

  If the lining material L is cooled and exceeds the glass transition temperature and falls below the set temperature, the supply of pressurized air is stopped, and then the lining material L is cut at the end of the existing pipe K, and the inner wall of the manhole Perform tube processing. Thereby, the flowing water in which the flow in the existing pipe K is prevented from flowing along the lining material L in close contact with the inner peripheral surface of the existing pipe K resumes the flow.

  In the above-described embodiment, the case where the pipe body P is covered with the heat insulating layer F and then the pipe body P and the heat insulating layer F are formed in a U-shaped cross section and bonded is described. After bending and deforming P, the pipe body P bent and deformed is covered with a heat insulating layer F, and then the heat insulating layer F is deformed corresponding to the pipe body P bent and deformed to be adhered to the pipe body P. May be.

  Hereinafter, another embodiment of the manufacturing apparatus for manufacturing the lining material L in this manner will be described with reference to FIG.

  The manufacturing apparatus 20 includes an extruder 21 that heats and melts a thermoplastic resin material, an extrusion mold 22 that forms the molten resin supplied from the extruder 21 into a tubular shape, and a pipe that is extruded from the extrusion mold 22. The temperature control unit 23 that cools and reheats the main body P, the first take-up machine 24 that takes the pipe main body P reheated by the temperature control unit 23, and the pipe main body P that is taken from the first take-up machine 24 The shaping device 25 that bends and deforms so that the cross-sectional diameter is small, the adhesive application device 26 that applies an adhesive to the pipe body P that is bent and deformed by the shaping device 25, and the bending device that is bent and bonded. A heat insulating layer forming device 27 that forms a tubular heat insulating layer F so as to cover the pipe main body P coated with the agent, a heat insulating layer folding device 28 that folds the heat insulating layer F in correspondence with the bent pipe main body P, and heat insulation Layer folding device 8 corresponds to the second take-up machine 241 that takes in the heat-insulating layer F folded in 8 and the pipe body P that is bent and deformed, the pipe body P that is bent and deformed by the second take-up machine 241, and the pipe body P The main part is comprised from the winder 29 which winds up the heat insulation layer F folded in this way.

  Here, the extruder 21, the extrusion die 22, the temperature control unit 23, the take-up machines 24 and 241, the shaping apparatus 25, and the winder 29 constituting the manufacturing apparatus 20 are those employed in a conventionally known manufacturing apparatus. The detailed description thereof will be omitted.

  The adhesive application device 26 continuously applies the adhesive C having a constant width to the outer peripheral surface of the pipe body P over the tube axis direction, and the application position is such that the cross-sectional diameter is reduced by the shaping device 25. The pipe body P is bent and deformed, specifically, the concave bottom portion of the pipe body P folded into a U-shaped cross section.

  Further, the heat insulating layer forming device 27 is a forming device that extends the heat insulating layer F from the heat insulating layer original fabric 271 formed by winding the sheet-like heat insulating layer F into a roll shape and covers the pipe body P that is bent and deformed. After being formed into a tubular shape by 272, both ends formed and overlapped in a tubular shape are joined by an end joining device 273 to form a pipe.

  Furthermore, the heat insulating layer folding device 28 folds the heat insulating layer F into a U shape corresponding to the pipe body P folded into a U-shaped cross section by the shaping device 25, and at the concave bottom portion of the pipe main body P. F is adhered.

  In order to manufacture the lining material L using such a manufacturing apparatus 20, the thermoplastic resin material is supplied to the extruder 21, the thermoplastic resin material is extruded into a tubular shape from the extrusion mold 22, and the pipe body P is formed. Then, it is taken up by the first take-up machine 24 (see FIG. 7A). At this time, the pipe main body P is allowed to pass through the temperature control unit 23 to regulate the outer diameter thereof, and after the pipe main body P is cooled to a temperature lower than the glass transition temperature Tg of the thermoplastic resin, the glass transition is performed. Reheat to a temperature above the temperature Tg.

  The reheated pipe body P is bent and deformed by the shaping device 25 so that the cross-sectional diameter thereof is reduced. Specifically, it is folded into a U-shaped cross section (see FIG. 7B). Next, an adhesive C having a certain width is applied to the concave bottom portion of the pipe body P folded into a U-shaped cross section by the adhesive application device 26 over the tube axis direction (see FIG. 7C). Thereafter, the sheet-like heat insulating layer F is folded from the heat insulating layer original fabric 271 of the heat insulating layer forming device 27 toward the pipe body P in which the adhesive C is applied to the concave bottom portion while being folded into a U-shaped cross section. After extending and forming in a tubular shape so as to cover the pipe body P by the forming device 272, both ends of the heat insulating layer F overlapped by the joining device 273 are joined to form a pipe (see FIG. 7D).

  Further, the heat insulating layer F placed on the pipe main body P is folded into a U-shaped cross section corresponding to the pipe main body P folded into a U-shaped cross section by the heat insulating layer folding device 28. At this time, the pipe body P folded into a U-shaped cross section and the heat insulating layer F folded into a U-shaped cross section are bonded via an adhesive C at their concave bottoms (see FIG. 7E). .

  Next, the pipe body P and the heat insulating layer F, which are formed in a U-shaped cross section and are bonded via the adhesive C, are taken as the lining material L via the second take-up machine 241 and are taken up by the winder 29. Is wound around the winding drum 291 (see FIG. 7F).

  In this case, the pipe body P folded into a U-shaped section and the heat insulating layer F folded into a U-shaped section are bonded to each other at the concave bottom portion with an adhesive C. Thus, the heat insulating layer F can be reliably wound without being displaced, and the heat insulating layer F can be held without protruding from the concave portion of the pipe body P shaped in a U-shaped cross section. Therefore, when the lining material L having a U-shaped section composed of the pipe main body P and the heat insulating layer F is wound around the winding drum 91 of the winder 9, the heat insulating layer F is formed from the pipe main body P shaped in a U-shaped cross section. It is possible to reliably prevent breakage and breakage caused by protruding and curling up or bending.

  The case where the existing pipe K is rehabilitated using the lining material L thus manufactured is also as described above, and the detailed description thereof is omitted.

It is the schematic of the manufacturing apparatus which enforces one Embodiment of the manufacturing method of the lining material of this invention. It is sectional drawing explaining the lining material in manufacturing process I, II, III, IV, V of the manufacturing apparatus of FIG. It is process drawing explaining the process of renovating an existing pipe using the lining material manufactured with the manufacturing method of this invention, and sectional drawing of an existing pipe. It is process drawing explaining the process of renovating an existing pipe using the lining material manufactured with the manufacturing method of this invention, and sectional drawing of an existing pipe. It is process drawing explaining the process of renovating an existing pipe using the lining material manufactured with the manufacturing method of this invention, and sectional drawing of an existing pipe. It is the schematic of the manufacturing apparatus which enforces other embodiment of the manufacturing method of the lining material of this invention. It is sectional drawing explaining the lining material in manufacturing process I, II, III, IV, V, VI of the manufacturing apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20 Manufacturing apparatus 2,21 Extruder 3,22 Extrusion die 4,23 Temperature control part 5,51,24,241 Take-out machine 6,26 Adhesive application apparatus 7,27 Heat insulation layer forming apparatus 8,25 Shaping Equipment 9, 29 Winder 28 Heat insulation layer folding equipment L Lining material P Pipe body F Heat insulation layer C Adhesive

Claims (4)

  A thermoplastic resin material is extruded to form a tubular pipe body, and after cooling the pipe body to a temperature not higher than the glass transition temperature of the thermoplastic resin material, the pipe body is glass transition temperature of the thermoplastic resin material. After reheating until the above temperature is reached, and then applying an adhesive to the pipe body, a sheet-like heat insulating layer is formed into a tubular shape and covered with the pipe body, and then the pipe body is made to have a smaller cross-sectional diameter. The heat insulating layer is deformed along the pipe body and bonded to the pipe body via an adhesive, and the pipe body is bent and deformed, and the heat insulating layer is bonded in a deformed state along the pipe body. A method for producing a lining material, wherein the lining material is wound up.   The method for manufacturing a lining material according to claim 1, wherein the pipe body is folded into a U-shaped section, and at the same time, the heat insulating layer is folded into a U-shaped section along the pipe body, and an adhesive is applied to the concave bottom portions thereof. The manufacturing method of the lining material characterized by adhering via.   A thermoplastic resin material is extruded to form a tubular pipe body, and after cooling the pipe body to a temperature not higher than the glass transition temperature of the thermoplastic resin material, the pipe body is glass transition temperature of the thermoplastic resin material. Reheat until the above temperature is reached, then bend and deform the pipe body so that its cross-sectional diameter is small, then apply an adhesive to the bent and deformed pipe body, and then apply a sheet-like heat insulation layer After forming into a tubular shape and covering the pipe body, the heat insulating layer is deformed along the bent pipe body and bonded to the pipe body via an adhesive, and the bent pipe body and the pipe body are bent and deformed. A method for producing a lining material, comprising winding up a heat insulating layer bonded in a deformed state.   The lining material manufacturing method according to claim 3, wherein the pipe body is folded in a U-shaped cross section, and then the heat insulating layer is folded in a U-shaped section along the pipe body, and the adhesive is applied to the concave bottom portions thereof. The manufacturing method of the lining material characterized by adhering via.

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