JP2014004782A - Lining apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining apparatus capable of achieving uniform heating and improving heating efficiency for a lining material which includes a composite material layer composed of a thermoplastic resin material and a reinforced fiber material.SOLUTION: A lining apparatus 1 is equipped with a heating section which heats and melts a thermoplastic resin material contained in a lining material 10. The heating section 11 is equipped with: a body section 2 having a cylindrical space 28 which is equipped with two inner and outer metal cylindrical bodies being an outer cylinder 25 and an inner cylinder 26 and is closed; a coil heater 31 spirally installed at an outer peripheral surface of the inner cylinder 26; and a supply tube 32 which supplies fluid into the cylindrical space 28. A large number of opening portions 261 are provided at the inner cylinder 26 and send out heated fluid, which is produced by heating by the coil heater 31 in the cylindrical space 28, from the opening portions 261 to the inner peripheral side of the inner cylinder. The body section 2 is configured such that the lining material 10 is inserted through the inner peripheral side of the inner cylinder 26 to be surrounded by the cylinder, and the lining material 10 is heated from the outer peripheral side.

Description

  The present invention relates to a lining device used for lining a pipeline. In particular, the present invention relates to a lining apparatus with improved heating performance for a lining material containing a composite material.

  As a method of rehabilitating the underground pipe without excavating it, a method of inserting an uncured FRP cylindrical body into the pipe line, or inserting a thermoplastic resin tubular lining material into the pipe line A method for lining underground pipes by bringing them into close contact with the inner surface has been put into practical use.

  For example, in Patent Document 1, a lining material that is smaller in diameter than the inner diameter of an existing pipe and recovers in a tubular shape at a shape memory temperature is heated in the existing pipe to recover the shape, and then pressurized to expand the diameter. A method is disclosed in which a lining is brought into close contact with an inner peripheral surface of an existing pipe.

  Patent Documents 2 and 3 disclose a method of inserting a lining material made of a thermoplastic composite material reinforced with fibers into an existing pipe and heating and pressurizing the lining material to perform lining.

  The lining material is formed in a substantially cylindrical shape by a composite material of a thermoplastic filament made of a thermoplastic resin material and a reinforcing fiber filament made of glass fiber in a previous stage of heating. As a lining method, after inserting the lining material into an existing pipe, the thermoplastic resin material of the lining material is melted using a lining device. Thereby, the reinforcing fiber material is dispersed in the molten thermoplastic resin material. Thereafter, the inside of the lining material is pressurized to expand the diameter, the thermoplastic resin material is cooled and solidified, and the existing pipe is rehabilitated by the composite lining material reinforced with reinforcing fibers.

  This type of lining apparatus is configured to heat the lining material from the inside while moving in the tube axis direction along the lining material disposed inside the existing pipe. For example, when the lining device disclosed in Patent Document 3 is pulled by a winch and passes through the inside of the lining material, the central portion provided with the heating element supplies the heating gas to the inner peripheral side of the lining material, Heat the lining material from the inside.

Japanese Patent Laid-Open No. 11-230212 Japanese Patent No. 4076188 JP-T-2006-523152

  The conventional lining apparatus has the following problems in order to heat a lining material made of a thermoplastic composite material without excess or deficiency, and there is still room for improvement.

  That is, the lining material may have a configuration in which a sheet-like or film-like inner layer is provided on the innermost side in order to ensure smoothness and water tightness of the inner surface. In such a case, even if the lining material is heated from the inside, heat is transferred through the inner layer, so that there is a problem that the heating efficiency is poor.

  In addition, since the thermoplastic resin material of the lining material is melted in the existing pipe having a relatively low temperature, the lining material is easily cooled, and the outer side of the lining material is heated by the heating gas supplied from the inner peripheral side of the lining material. There is also a problem that it is difficult to uniformly melt the thermoplastic resin material in the thickness direction.

  Therefore, in the conventional lining apparatus, the heating with respect to the lining material is likely to be non-uniform, and there is a possibility that unmelted residue may be generated in the thermoplastic composite material. If there is any undissolved part in the lining material, it will not be possible to obtain a uniform structure in which the reinforcing fiber material is dispersed in the thermoplastic resin material, resulting in non-uniform strength of the lining material. Absent.

  In order to avoid the occurrence of undissolved residue, it is conceivable that the heating temperature is set high or the heating time is set long. However, in this case, a portion where heating is excessive occurs, and a part of the thermoplastic resin material may flow to cause uneven thickness of the lining material.

  The present invention has been made in view of this point, and the object of the present invention is to make heating uniform for a lining material including a composite material layer made of a thermoplastic resin material and a reinforcing fiber material. An object of the present invention is to provide a lining apparatus capable of improving efficiency and shortening a construction period.

  The solution means of the present invention for achieving the above object is premised on a lining device for lining an inner surface of an existing pipe with a lining material including a composite material layer made of a thermoplastic resin material and a reinforcing fiber material. The lining apparatus is provided with a heating unit that heats and melts the thermoplastic resin material contained in the lining material. The heating unit includes at least one main body formed to have a closed cylindrical space including two inner and outer metal cylinders of an outer cylinder and an inner cylinder, and a spiral shape on the outer peripheral surface of the inner cylinder. And a supply path for supplying fluid to the cylindrical space. A large number of openings are formed in the inner cylinder of the main body, and the heated fluid generated by heating by the coil heater in the cylindrical space is sent from the opening to the inner peripheral side of the inner cylinder. And it is set as the structure which inserts a lining material in the inner peripheral side of the said inner cylinder, encloses a lining material with the said main-body part, and heats from the outer peripheral side of this lining material.

  With this specific matter, heat can be applied to the composite material layer of the lining material from the outer peripheral side of the lining material. For this reason, even if an inner layer is provided on the inner peripheral side of the lining material, the inner layer does not hinder heating, and the heating part and the composite material layer can be heated in a state of being close to each other. It becomes. Moreover, even in a relatively low temperature existing pipe, heat loss can be kept low, and heating can be performed efficiently. Thus, when the lining material is inserted into the existing pipe and the lining material is heated to melt the thermoplastic resin material, the heat applied to the lining material uniformly heats the entire thermoplastic resin material. Become. Therefore, the entire thermoplastic resin material can be melted in a relatively short time, and the construction time required to obtain a configuration in which the reinforcing fiber material is dispersed in the thermoplastic resin material over the entire lining material. It can be shortened. Further, since the heating to the lining material is made uniform, no undissolved residue is generated in the thermoplastic resin material, and it is possible to avoid that a part of the thermoplastic resin material is excessively heated and flows.

  The following is mentioned as a more concrete structure of the said lining apparatus. In other words, the heating unit may have a configuration in which a plurality of main body units are connected via flexible connecting means.

  Accordingly, the lining material is sequentially heated by the plurality of main body portions, and the heating of the lining material can be sufficiently distributed. In addition, since the plurality of main body portions are connected via flexible connecting means, even if the existing pipe has a bent pipe line portion, the heating portion can be arranged to follow the curvature, The lining material can be heated uniformly regardless of the shape of the pipe.

  More preferably, the connecting means is constituted by a flexible pipe, and the connecting means is also used as a fluid supply path.

  Thereby, while being able to reduce the number of members arrange | positioned between the some main-body parts in a heating part, it can be made to follow easily the curvature of a bending pipe line part.

  In the lining device having the above-described configuration, a temperature detection unit that detects an internal temperature of the cylindrical space may be provided in the main body.

  Thereby, the temperature of the heating fluid for heating the lining material can be grasped, and the heating temperature can be controlled.

  Moreover, the lining apparatus of the said structure WHEREIN: As a main body part, it is good also as a structure which equips the inner peripheral side of the said inner cylinder with an auxiliary heating part, and heats from the inner and outer sides of the said lining material.

  Thereby, a lining material is arrange | positioned between the inner cylinder of a main-body part, and an auxiliary | assistant heating part, and is uniformly heated by the heat given from both. The heat given to the lining material is held between the inner cylinder and the auxiliary heating part and is difficult to escape to the outside of the main body part, so that heat loss is suppressed. Therefore, uniform heating of the lining material and good adhesion to the inner surface of the existing pipe can be suitably ensured.

  With the lining apparatus according to the present invention, it is possible to achieve uniform heating and improve heating efficiency for a lining material including a composite material layer made of a thermoplastic resin material and a reinforcing fiber material. It becomes. As a result, the entire thermoplastic resin material can be melted in a relatively short time, and the construction for obtaining a configuration in which the reinforcing fiber material is dispersed in the thermoplastic resin material over the entire lining material. Time can be shortened.

It is explanatory drawing which shows the lining method of the existing pipe | tube using the lining apparatus which concerns on embodiment of this invention. It is a perspective view which shows the heating part in the lining apparatus which concerns on Embodiment 1 with a partial cross section. It is sectional drawing which shows an example of the lining material arrange | positioned at the existing pipe. It is sectional drawing which shows the existing pipe lined with the said lining material. It is sectional drawing of the axial direction which shows the heating part of the lining apparatus which concerns on Embodiment 2. FIG. It is AA sectional drawing of the lining apparatus in FIG. It is explanatory drawing which shows a mode that the straight pipe part of an existing pipe is lined with the said lining apparatus. It is explanatory drawing which shows a mode that the bending pipe line part of an existing pipe is lined with the said lining apparatus. It is a perspective view which shows the modification of the heating part of the said lining apparatus with a partial cross section.

  Hereinafter, a lining apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is an explanatory view showing a process of lining the inner surface of an existing pipe 8 using a lining material 10, and FIG. 2 schematically shows a heating unit 11 of the lining device 1 according to the first embodiment together with a partial cross section. It is the shown perspective view. 3 and 4 show an example of the lining material 10, FIG. 3 is a sectional view showing the unheated lining material 10 disposed in the existing pipe 8, and FIG. 4 shows a state after heating and pressurization. It is sectional drawing which shows the lining material 10 of.

  The lining device 1 is a device for heating a lining material 10 including a composite material layer 101 made of a thermoplastic resin material and a reinforcing fiber material and lining the inner surface of an existing pipe 8.

  Prior to the description of the lining device 1, an outline of the lining material 10 applied to the lining device 1 will be described.

  The lining material 10 has a multilayer structure including a flexible tubular fabric made of a fiber-reinforced composite material. The lining material 10 shown in FIG. 3 has a two-layer structure including a composite material layer 101 made of thermoplastic filaments and reinforcing fiber filaments, and an inner layer 102 formed with a smaller diameter than the composite material layer 101. .

  The composite material layer 101 is made of a braid, woven fabric, or knitted material made of thermoplastic resin filaments and reinforcing fiber filaments. Examples of the thermoplastic resin material of the thermoplastic resin filament include polypropylene (PP), high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), polystyrene (PS), and polyethylene terephthalate (PETP). , Polybutylene terephthalate (PBTP), polyvinylidene fluoride (PVDF), polyamide 6 (PA6), or polyamide 66 (PA66). Examples of the reinforcing fiber filament include glass fiber, carbon fiber, aramid fiber, ceramic fiber, and metal fiber.

  The inner layer 102 is made of a sheet-like or film-like thermoplastic resin material and covers the inner peripheral side of the lining material 10 to ensure inner surface smoothness and water shielding.

  When the lining material 10 is heated by the lining apparatus 1, the thermoplastic resin material is melted. Further, the heated lining material 10 is pressurized from the inside and expanded in diameter, and is in close contact with the inner surface of the existing pipe 8 to form a lining layer as shown in FIG.

  The lining device 1 according to the first embodiment includes a heating unit 11 that heats the lining material 10. The heating unit 11 includes a main body 2, a coil heater 31 as a heat source provided in the main body 2, and a supply pipe 32 that supplies a fluid into the main body 2.

  As shown in FIG. 2, the main body 2 is provided so as to close between the two inner and outer cylinders of the outer cylinder 25 and the inner cylinder 26 and both axial ends of the outer cylinder 25 and the inner cylinder 26. It is formed so as to have a cylindrical space 28 inside by strip plate-like and annular end members 27, 27. The outer cylinder 25, the inner cylinder 26, and the end member 27 are formed of a metal material such as stainless steel.

  The outer cylinder 25 of the main body 2 is formed with a smaller diameter than the existing pipe 8 and has a size that allows the inside of the existing pipe 8 to be inserted along the pipe axis direction. For example, for the existing pipe 8 having an inner diameter of 105 mm, the outer diameter of the main body 2 is 85 mm. The inner cylinder 26 is formed with a smaller diameter than the outer cylinder 25 and is disposed inside the outer cylinder 25.

  The inner cylinder 26 is provided with many small hole openings 261. The inner cylinder 26 can be formed by drilling a large number of openings 261 in a metal cylinder. The inner cylinder 26 may be formed by forming a porous metal plate such as punching metal or expanded metal into a cylindrical shape.

  A coil heater 31 connected to the feeder is spirally wound around the outer peripheral surface of the inner cylinder 26. The end member 27 of the main body 2 is provided with a through hole (not shown) through which the coil heater 31 is inserted. The coil heater 31 is a heat source that heats the internal atmosphere of the cylindrical space 28 between the inner cylinder 26 and the outer cylinder 25.

  A supply pipe 32 that supplies fluid to the cylindrical space 28 is connected to the end member 27. The supply pipe 32 is formed of a tubular body having a circular cross-sectional shape, and is connected to the ground compressor 92 (or blower) shown in FIG. The compressor 92 sends compressed air through the supply pipe 32 to the main body 2 of the heating unit 11. The air is heated by the heat generated by the coil heater 31 in the cylindrical space 28 of the main body 2, passes through the opening 261 as hot air, and is supplied to the inner peripheral side of the inner cylinder 26.

  The main body 2 further includes temperature detection means for detecting the internal temperature of the cylindrical space 28. In the illustrated form, a thermocouple 33 as temperature detecting means is inserted into the cylindrical space 28. The end member 27 is provided with an insertion hole (not shown) into which the thermocouple 33 is inserted. The thermocouple 33 has a lead wire connected to a temperature control device (not shown). The thermocouple 33 is arranged along the axial direction in the cylindrical space 28 so as not to contact the outer cylinder 25, the inner cylinder 26, and the coil heater 31.

  As shown in FIG. 1, a pressurizing unit 5 is disposed behind the heating unit 11 of the lining device 1. The pressurizing unit 5 includes a pressurizing tube 51 that can be sufficiently expanded in diameter by internal pressure. The pressurizing tube 51 is made of a material having sufficient expandability and heat resistance, such as elastomer, silicon rubber, and polyvinyl chloride, which has sufficient strength for expansion. The outer diameter of the pressurizing tube 51 is set to a size capable of pressing the lining material 10 from the inner side to the inner peripheral surface of the existing pipe 8 at the maximum expansion.

  The pressurized tube 51 can be expanded in diameter by internal pressurized air, and is connected to the reversing machine 93 installed on the ground in an unexpanded state. The pressurizing tube 51 is introduced into the existing pipe 8 while being reversed from the distal end side by the reversing machine 93.

  In addition to the compressor 92, a generator 91 is also installed near the manhole M2 as ground equipment for the lining device 1. The air supply pipe 32 connected to these, the power supply line of the coil heater 31, and the like are arranged to the heating unit 11 in the existing pipe 8 through the manhole M2.

  With the lining device 1 configured as described above, in the heating unit 11, the air supplied to the cylindrical space 28 of the main body 2 is heated by the coil heater 31, and the generated hot air is supplied to the inner cylinder 26. It injects from the opening part 261 to the inner peripheral side. The lining material 10 is inserted into the cylindrical central region of the main body 2. Since the lining material 10 is heated from the outer peripheral side, heat is efficiently transferred to the composite material layer 101 without the inner layer 102 blocking heat, and the thermoplastic resin material is melted.

(Lining method for existing pipes)
Next, a method for lining the existing pipe 8 using the lining device 1 will be described with reference to FIG.

  In the following description, for convenience of explanation, the traveling direction in the pipe line when the lining device 1 linings the existing pipe 8 is the front, and the opposite direction is the rear. Further, in order to make the drawing easy to see, in FIG. 1, the existing pipe 8, the lining material 10, and the like are shown in cross section, and the heating unit 11 of the lining device 1 disposed inside the existing pipe 8 is shown in a side view.

  As shown in FIG. 1, a lining material 10 is inserted and disposed in a repair target portion of the existing pipe 8. Prior to the lining operation, when there is running water such as sewage in the existing pipe 8, it is preferable to remove this running water from the pipe once. Manholes M1 and M2 are provided in the pipe line of the existing pipe 8 at an appropriate interval, and a damming member 7 is provided on the upstream side of the nearby manhole. The spilled water that has been dammed is drawn from the drainage pump through the manholes M1 and M2, and discharged to the downstream side by using a drainage hose (not shown) disposed on the ground as a detour. Further, foreign matter such as deposits and wood chips existing in the existing pipe 8 is removed, and after performing high-pressure water cleaning, the lining work in the pipe is started.

  First, the lining material 10 is guided to the existing pipe 8 through the manholes M1 and M2. The lining material 10 is prepared with, for example, a length obtained by adding an extra length to the length between the start side manhole M1 and the arrival side manhole M2.

  Next, the end of the lining material 10 disposed in the existing pipe 8 is inserted into the inner peripheral side of the heating unit 11 of the lining device 1. A pulling wire (not shown) is attached to the tip of the heating unit 11. With this pulling wire, the lining device 1 is pulled in the direction of the arrival side manhole M2 from the start side manhole M1.

  The lining apparatus 1 heats the lining material 10 in order from the end by the heating unit 11 that moves in the direction from the start side manhole M1 to the arrival side manhole M2. At this time, hot air sprayed from the main body 2 of the heating unit 11 is heated from the outer peripheral side of the lining material 10. Thereby, the thermoplastic resin material contained in the lining material 10 is melted (heating step).

  In the heating step, heating is performed at a temperature equal to or higher than the melting point of the thermoplastic resin material of the lining material 10. That is, the temperature of the hot air is set by the thermoplastic resin material of the lining material 10. For example, when polypropylene (melting point is about 160 to 170 ° C.) is adopted as the thermoplastic resin material, the temperature of the hot air in the lining process of the existing pipe 8 is set to about 180 to 200 ° C. When high-density or low-density polyethylene (melting point is 140 ° C.) is adopted as the thermoplastic resin material, the temperature of hot air in the lining process of the existing pipe 8 is set to 150 to 170 ° C., for example.

  Thereby, the thermoplastic resin material of the lining material 10 is melted, and the entire lining material 10 becomes a tubular composite material in which the reinforcing fiber material is mixed.

  The diameter of the lining material 10 that has been softened through the heating process is gradually expanded as the subsequent pressurizing unit 5 moves forward. Specifically, the lining material 10 is pressed from the inside by the pressurizing unit 5 and is expanded in a tubular shape along the inner peripheral surface of the existing tube 8 (a diameter expansion step).

  Pressurized gas is supplied to the pressurizing tube 51 from the reversing machine 93 and expanded so that the inner peripheral surface is reversed to the outer peripheral side while following the progress of the lining device 1. Along with this, the lining material 10 is pressed from the inside by the pressurizing tube 51 in order from the part melted and softened through the heating unit 11 and expanded in diameter.

  The expanded part of the lining material 10 is in close contact with the inner surface of the existing pipe 8. As the lining device 1 moves forward as described above, the expansion range of the pressurizing tube 51 is also expanded forward, and the close contact state between the lining material 10 and the existing pipe 8 is maintained as it is, and a uniform force is applied over a wide range. can do.

  If the diameter of the lining material 10 is expanded over the entire area of the existing pipe 8 to be repaired, the supply of the heating fluid to the lining device 1 is stopped, and the cooling and hardening is performed by a cooling medium such as normal temperature pressurized air. (Cooling process). After cooling, the pressure tube 51 is peeled off from the lining material 10 and removed. Thereby, the inner peripheral surface of the existing pipe 8 is lined by the lining material 10 (see FIG. 4).

  Thus, the lining apparatus 1 heats the lining material 10 from the outer peripheral side to soften it uniformly, and immediately after that, the diameter is expanded by the subsequent pressure tube 51. Further, even if the lining material 10 includes the inner layer 102 on the inner peripheral side, the inner layer 102 does not hinder heating, and the heating unit 11 and the composite material layer 101 are heated in a state of being close to each other. Can do.

  Therefore, the heat applied to the lining material 10 uniformly heats the entire thermoplastic resin material, and the heating unevenness of the lining material 10 can be eliminated. In addition, since the entire thermoplastic resin material can be melted in a relatively short time, a configuration in which the reinforcing fiber material is dispersed in the thermoplastic resin material is obtained over the entire lining material 10. The construction time can be shortened. In addition, since the heating to the lining material 10 is made uniform, no undissolved residue is generated in the thermoplastic resin material, and the problem that a part of the thermoplastic resin material flows is also avoided.

  In addition, the lining apparatus 1 which concerns on this invention is not limited to the structure which has the one main-body part 2 as the heating part 11, The structure which has the several main-body part 2 may be sufficient. An example in which the heating unit 11 includes a plurality of main body units 2 will be described in the second embodiment.

(Embodiment 2)
Next, a lining device 1 according to Embodiment 2 of the present invention will be described with reference to the drawings.

  5 to 7 show the configuration of the lining device 1 according to the second embodiment, FIG. 5 is a sectional view in the axial direction of the heating unit 11, FIG. 6 is a sectional view taken along line AA in FIG. It is sectional drawing which shows typically the mode of the lining construction using 1. FIG.

  In the lining device 1, the internal structure of each main body unit 2 and the configuration of the pressurizing unit 5 and the like are the same as those of the first embodiment. Omitted.

  The lining apparatus 1 shown in FIG. 5 has four main body parts 2 (21, 22, 23, 24) as the heating part 11. The heating unit 11 has a first body part 21, a second body part 22, a third body part 23, and a fourth body part in order from the front with respect to the traveling direction of the lining device 1 (that is, the direction from right to left in the figure). The main body 24 is connected.

  These four main body portions 2 are connected via a flexible pipe 34. A plurality of the flexible pipes 34 are installed between the adjacent main body portions 2 and are arranged substantially evenly in the circumferential direction. In the example shown in FIG. 6, four flexible pipes 34 penetrate and are fixed to the end member 27. The end of each flexible pipe 34 is inserted to the inside of the cylindrical space 28 and opened to the cylindrical space 28.

  For example, when the outer diameter of the main body 2 is 85 mm and the length in the axial direction is 100 mm, the main body 2 is connected by a flexible pipe 34 with an interval of about 30 mm. Is done.

  The flexible pipe 34 also serves as an air supply path for the main body 2 by circulating air from the compressor 92. The flexible pipe 34 is made of a tube body having excellent flexibility and heat resistance, such as a cross-linked polyethylene pipe.

  Each of the flexible pipes 34 connected to the front of the first main body 21 has one end penetrating the cylindrical space 28 and the other end connected to the compressor 92. Therefore, the flexible pipe 34 is first connected to the front end member 27 of the first main body portion 21 and supplies air to the cylindrical space 28 of the first main body portion 21. The flexible pipe 34 installed between the first main body portion 21 and the second main body portion 22 connects the two, and air that has passed through the first main body portion 21 is allowed to flow through the second main body portion 22. Feed into the cylindrical space 28. Air is sequentially supplied to the rear main body 2 through the flexible pipe 34.

  A part of the supplied air is injected from the opening 261 in the front main body 2 to heat the lining material 10. The remaining air passes through the main body 2 and is supplied to the rear main body 2 and is heated again by the coil heater 31. Therefore, the hot air supplied to the lining material 10 through the plurality of main body portions 2 does not cause a temperature drop at the leading and trailing ends of the plurality of main body portions 2 and uniformly heats the entire lining material 10.

  The heating unit 11 may have a configuration in which appropriate connecting means such as a wire or a spring wire is installed between the adjacent main body portions 2 so that the main body portions 2 are connected in an auxiliary manner.

  One coil heater 31 is in communication with the first main body portion 21, the second main body portion 22, and the third main body portion 23. The coil heater 31 is inserted into the cylindrical space 28 from the first main body portion 21 disposed at the head portion, and is wound spirally around the outer peripheral surface of the inner cylinder 26. The coil heater 31 is pulled out from the rear of the first main body portion 21 and is inserted into the cylindrical space 28 of the subsequent second main body portion 22. The coil heater 31 wound spirally around the inner cylinder 26 of the second main body 22 is drawn into the cylindrical space 28 of the third main body 23.

  Also in this embodiment, a thermocouple 33 is provided as temperature detecting means. The thermocouple 33 is disposed at least in the cylindrical space 28 of the fourth main body 24. In the illustrated form, in addition to the fourth main body 24, the third main body 23 is also provided with a thermocouple 33. These thermocouples 33 are inserted through the first main body 21 and the second main body 22 to the third main body 23 or the fourth main body 24. Each thermocouple 33 is arranged along the axial direction in the cylindrical space 28 so as not to contact the outer cylinder 25, the inner cylinder 26, the coil heater 31, and the like of each main body 2.

  The fourth main body 24 arranged at the rearmost end of the heating unit 11 has a supply pipe 32 connected to a front end member 27, and a coil heater 35 and a thermocouple 33 are inserted into the cylindrical space 28. A lid member 29 that closes the cylindrical space 28 is fitted into the rear end portion of the fourth main body portion 24.

  The fourth main body portion 24 is provided with a coil heater 35 different from the coil heater 31 provided on the front side. The coil heater 35 has a smaller diameter than the coil heater 31 disposed on the front side, and is tightly wound around the inner cylinder 26 of the fourth main body 24. The inner cylinder 26 is formed with a large number of small holes (openings) (not shown).

  The coil heater 35 of the fourth main body 24 is inserted from the end member 27 in front of the first main body 21, and communicates the first main body 21, the second main body 22, and the third main body 23 in a straight line. Arranged. The coil heater 35 is formed with a small diameter so as not to contact the outer cylinder 25, the inner cylinder 26, and the coil heater 31 of each main body 2, and extends along the axial direction in each cylindrical space 28. It is arranged and drawn into the fourth main body 24. Thereby, it is comprised so that the fixed heating performance in the 4th main-body part 24 can be ensured by space saving.

  The fourth main body 24 includes the auxiliary heating unit 4 on the inner peripheral side of the inner cylinder 26. The auxiliary heating unit 4 is made of a metal material having a high thermal conductivity such as copper and has a truncated cone shape. A cartridge heater 41 is embedded in the axial center of the auxiliary heating unit 4.

  The auxiliary heating unit 4 is arranged concentrically with the fourth main body 24. The auxiliary heating unit 4 is disposed with the top of the truncated cone facing forward, and a pulling wire 42 is attached to the front end. The pulling wire 42 is connected to a winch (not shown) on the ground through the inner peripheral side of the inner cylinder 26 of the other main body 2. Thereby, the auxiliary heating unit 4 is pulled so as to advance in the existing pipe 8 in synchronization with the fourth main body 24.

  As shown in FIG. 7, in the fourth main body 24, the lining material 10 is inserted between the inner peripheral surface of the inner cylinder 26 and the outer peripheral surface of the auxiliary heating unit 4. The gap between the inner cylinder 26 and the auxiliary heating unit 4 is formed in a tapered shape in which the rear is narrower than the front. The lining material 10 is guided to the rear of the fourth main body portion 24 while being gradually expanded outward by inserting the gap.

  The gap between the inner cylinder 26 and the auxiliary heating unit 4 is relatively small and there is little room for low temperature air to enter. For this reason, the gap is filled with hot air sent from the cylindrical space 28, heat radiation from the outer peripheral surface of the auxiliary heating unit 4, and radiant heat of the outer peripheral surface of the auxiliary heating unit 4, and is maintained at a high temperature state. . Thereby, in the 4th main-body part 24, the lining material 10 is heated uniformly from both surfaces of an outer peripheral side and an inner peripheral side.

  A pressurizing unit 5 is disposed behind the fourth main body 24, and the diameter of the lining material 10 that has been sufficiently heated and softened through the four main bodies 2 is expanded by the pressurizing tube 51.

  By the lining device 1 having such a configuration, the lining material 10 is heated from the outer peripheral side by the first main body portion 21 of the heating unit 11, and further heated by the subsequent second main body portion 22 and third main body portion 23, and is thermoplastic. The resin material melts. Finally, the lining material 10 is heated from both the inner and outer sides in the fourth main body 24, the adhesion between the lining material 10 and the existing pipe 8 is enhanced on the outer peripheral side, and the lining material 10 is expanded on the inner peripheral side. Diameter is improved.

  Thereby, the lining material 10 is efficiently and uniformly heated without being affected by the low temperature environment in the existing pipe 8 and the heat blocking action by the inner layer 102 on the inner peripheral side. Therefore, the thermoplastic resin material of the lining material 10 can be uniformly melted in a relatively short time. That is, it is possible to shorten the construction time and the heating time for obtaining the configuration in which the reinforcing fibers are dispersed in the thermoplastic resin material over the entire lining material 10. In addition, the uniform heating of the lining material 10 prevents the thermoplastic resin material from remaining undissolved, and prevents a portion of the thermoplastic resin material from being overheated and flowing. .

  The lining apparatus 1 can be suitably used not only for lining the straight tubular existing pipe 8 shown in FIG. 7 but also for the existing pipe 8 having a bent pipe line portion. FIG. 8 is an explanatory view showing a state of lining the bent pipe line portion, and shows a state in which the lining device 1 is viewed from above with respect to a cross section of the existing pipe 8.

  As shown in the drawing, each main body 2 in the heating unit 11 is connected via a flexible pipe 34, and thus forms an arrangement form following the curvature of the pipe line. Thereby, the lining apparatus 1 can be smoothly pulled even if it exists in a curved pipe line part, and can advance, heating the lining material 10 along a pipe line.

(Other embodiments)
The lining device 1 according to the present invention can be implemented in various other forms besides the above-described embodiment.

  For example, in the embodiment, the example in which one or four main body portions 2 are provided in the heating unit 11 is shown, but the number of the main body portions 2 is not limited, and how many are connected. Also good. In addition, when a plurality of main body parts 2 are connected, any main body part 2 may be connected by any connecting means and a temperature detection point by a thermocouple 33 as a temperature detection means may be present.

  For example, as shown in FIG. 9, the heating unit 11 may have a configuration in which a plurality of main body portions 2 are connected and a flexible hose 36 having flexibility as a connecting means is installed between the main body portions 2. . In this case, the flexible hose 36 is used as a connecting means, and a supply pipe 32 that supplies fluid to the cylindrical space 28 is connected separately from the flexible hose 36. The end member 27 of the main body 2 is provided with a thermocouple 33 and a coil heater 31 in addition to the supply pipe 32.

  Further, the heater embedded in the auxiliary heating unit 4 is not limited to the cartridge heater 41, and may be a rod-shaped ceramic heater or the like. As a heating medium in which the heating unit 11 heats the lining material 10, in addition to the exemplified hot air, heating steam may be used. The configuration of the lining material 1 is not limited to the above embodiment, and may be a three-layer structure or a multilayer structure of four or more layers. Therefore, the said embodiment is an illustration and is not limited.

  INDUSTRIAL APPLICATION This invention can be utilized suitably for the lining of the existing pipe using the lining material containing the composite material layer which consists of a thermoplastic resin material and a reinforced fiber material.

DESCRIPTION OF SYMBOLS 1 Lining apparatus 11 Heating part 2 Main body part 21 1st main body part 22 2nd main body part 23 3rd main body part 24 4th main body part 25 Outer cylinder 26 Inner cylinder 261 Opening part 27 End member 28 Cylindrical space 31 Coil heater 32 Supply Pipe (supply channel)
DESCRIPTION OF SYMBOLS 33 Thermocouple 34 Flexible pipe 35 Coil heater 36 Flexible hose 4 Auxiliary heating part 41 Cartridge heater 5 Pressurization part 51 Pressurization tube 8 Existing pipe 91 Generator 92 Compressor 93 Inversion machine 10 Lining material 101 Composite material layer 102 Inner Layer M1, M2 Manhole

Claims (5)

A lining device for lining an inner surface of an existing pipe with a lining material including a composite material layer made of a thermoplastic resin material and a reinforcing fiber material,
A heating section for heating and melting the thermoplastic resin material contained in the lining material;
The heating unit is
At least one main body portion formed so as to have a closed cylindrical space provided with two inner and outer metal cylinders of an outer cylinder and an inner cylinder, and a coil helically attached to the outer peripheral surface of the inner cylinder A heater and a supply path for supplying fluid to the cylindrical space;
The main body is provided with a large number of openings in the inner cylinder, and sends heated fluid generated by heating by the coil heater in the cylindrical space from the opening to the inner peripheral side of the inner cylinder. With the configuration,
The main body is surrounded by inserting a lining material on the inner peripheral side of the inner cylinder, and is heated from the outer peripheral side of the lining material. The lining device according to claim 1,
The heating unit is a lining device in which a plurality of main body portions are connected through a connecting means having flexibility. The lining apparatus according to claim 2,
The lining device is characterized in that the connecting means is made of a flexible pipe and also serves as a fluid supply path. In the lining apparatus as described in any one of Claims 1-3,
The lining apparatus according to claim 1, wherein the main body portion is provided with temperature detecting means for detecting an internal temperature of the cylindrical space. In the lining apparatus as described in any one of Claims 2-4,
The main body includes an auxiliary heating unit on the inner peripheral side of the inner cylinder, and the lining material can be heated from both the inner and outer sides.

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