JP2013006405A - Lining device, and method for lining existing tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining device and method, capable of achieving sufficient strength expression or the like to a lining material comprising a fiber-reinforced composite material including a thermoplastic resin as a matrix.SOLUTION: The lining device 2 in one embodiment is provided with a diameter-enlarged tube 21 having flexibility, expandability and heat resistance, and the holding members 23A, 23B in both ends of the diameter-enlarged tube 21. The holding member 23A has a supply port 231 which feeds a fluid into the tube 21 and to which the air supply tube 3 of the fluid is connected. Further, a pressure controller 235 controlling a fluid pressure in the tube 21 and a discharge port 233 discharging the fluid in the tube 21 are provided to the holding member 23B. The fluid in the tube 21 can be discharged via the pressure controller 235, and the flow of the fluid from the holding member 23A toward the holding member 23B direction is formed.

Description

  The present invention relates to a lining apparatus for a lining material made of a thermoplastic composite material and a lining method for an existing pipe using the same.

  Rehabilitation without excavating underground pipes such as sewer pipes can be achieved by inserting an uncured FRP tubular body into the pipe or inserting a tubular lining material made of thermoplastic resin into the existing pipe. However, there is a method of lining by integrating it with the inner peripheral surface of an existing pipe, which has been put into practical use.

  For example, as disclosed in Patent Document 1, a lining material having a diameter smaller than the inner diameter of an existing pipe and recovering in a tubular shape at a shape memory temperature is inserted into the existing pipe, and the lining material is heated to recover the shape. Then, there is a rehabilitation method in which the diameter is increased by applying pressure from the inside, and the lining is brought into close contact with the inner peripheral surface of the existing pipe.

  In recent years, as disclosed in Patent Document 2 and Patent Document 3, a lining material made of a fiber-reinforced composite material is inserted into an existing pipe, and the lining material is heated and pressurized to be in close contact with the existing pipe. A method of lining up has also been proposed.

  This type of lining material is formed into a 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 before being heated. In the existing pipe lining method using such a lining material, the thermoplastic filament is melted by heating the lining material by a heating means after inserting the lining material into the existing pipe. Thereby, the reinforcing fiber filaments are dispersed in the molten thermoplastic resin material. After that, by applying pressure to the inner peripheral side of the lining material to expand the diameter and cooling and solidifying the thermoplastic resin material, a strong composite lining material reinforced with reinforcing fiber filaments is formed, and this composite lining material Existing pipes are rehabilitated.

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. There was room for improvement.

  First, the conventional lining method is a pig lining method using a lining device called a pig. The pig is heated while moving the inner peripheral side of the lining material in the tube axis direction of the existing pipe, and then the lining material. The effect is to expand the diameter. The pig comprises a front part to be pulled, a central part including heating means and support means, and a rear part including fixing means. During the lining operation, the front part of the pig is pulled by the ground winch, so that each part of the pig advances along the inner peripheral surface of the lining material. However, since such a pig has a considerable weight in the central portion provided with the heating means, its traction load is very large, and the insertion resistance to the inner peripheral surface of the lining material is very large. Therefore, the lining material melted by heating is liable to be deformed by being in contact with the pig, resulting in inconveniences such as uneven thickness and wrinkles and disturbing fiber orientation. When uneven thickness, wrinkles, fiber orientation disorder, etc. occur in the melted lining material, the strength of the lining material becomes non-uniform at that portion, and the water tightness may be reduced.

  Moreover, since this pig has mechanical rigidity in the front part and the center part, there exists a problem that the pipe diameter of a corresponding existing pipe will be restrict | limited by the magnitude | size, for example, it has a curved part and a bending part. There was also a problem that the bent pipes could not be inserted due to the interference of the pigs, and the applicability to various shapes of pipes was poor.

  On the other hand, as disclosed in Patent Document 2, a method of lining by inserting an inflatable bag into a lining material has also been proposed. In this method, the bag is inflated with a certain amount of high-temperature gas, and the lining material is heated by the inflated bag and compressed to the inner peripheral surface of the existing pipe. However, in this case, since the high-temperature gas for heating the thermoplastic resin material of the lining material is a constant amount, the heat amount for melting is also a constant amount. Since the heat capacity of gas is usually smaller than that of solid or liquid, it is considered that when the thermoplastic resin material is heated with the high temperature gas in the bag, the temperature drop of the high temperature gas becomes large. For this reason, a sufficient temperature for melting the lining material cannot be obtained, and the melting of the thermoplastic resin material becomes uneven or the melting cannot be performed quickly. As a result, it takes a relatively long time to heat the entire lining material, resulting in a problem that the construction time is prolonged.

  The present invention has been made in view of such problems, and its object is to replace a conventional lining method with a lining material made of a fiber-reinforced composite material using a thermoplastic resin as a matrix for a short time. To provide a lining apparatus that can be uniformly melted and applied to various pipe lines, and that can provide a lining having sufficient strength and high water tightness, and an existing pipe lining method using the lining apparatus. It is in.

  In order to achieve the above object, the solution means of the present invention is to rehabilitate the existing pipe by lining a cylindrical lining material made of a fiber reinforced composite material using a thermoplastic resin as a matrix on the inner peripheral surface of the existing pipe. A lining device is assumed. For this lining device, it is arranged along the inner periphery of the lining material, and has an expanded tube having expandability and heat resistance, and holding members that respectively close and hold both ends of the expanded tube, One holding member is provided with a supply path for supplying a fluid into the enlarged diameter tube and connected to a fluid supply line, and the other holding member is controlled with a pressure control for controlling the fluid pressure in the enlarged diameter tube. And a discharge passage for discharging the fluid in the diameter-expanded tube are provided so that the fluid can be discharged via the pressure controller. And it is comprised so that a positive pressure may be generated while forming the flow of the fluid from said one holding member toward the other holding member in the said diameter expansion tube.

  Due to this specific matter, by supplying a heated fluid to the diameter-expanded tube arranged inside the lining material, the lining material having a thermoplastic resin matrix is heated and melted from the inner peripheral side, and the diameter is expanded, and the existing pipe is expanded. It can be shaped into a shape along the inner peripheral surface. At this time, there is no need to move the expanded diameter tube in the direction of the axis of the existing pipe, thus preventing problems such as uneven thickness and wrinkles in the melted lining material and disturbance of fiber orientation. can do. Moreover, since the said diameter expansion tube can be bent and arrange | positioned along the pipe line shape of an existing pipe, it can be applied to various pipe line shapes. Further, the fluid supplied to the diameter expansion tube flows from the supply port of one holding member to the discharge port of the other holding member to form a fluid flow in the diameter expansion tube, and the pressure controller Since the fluid pressure is controlled, even when a fluid having a small heat capacity is used, a constant heating action and pressurizing action can be maintained, and an environment for good melting and shaping can be formed. Therefore, the lining material can be uniformly melted and shaped to sufficiently exhibit strength and water tightness.

  It is preferable that the lining device further includes a flow path forming means for guiding the fluid along the inner surface of the diameter-expanding tube.

  With such a configuration, the fluid supplied into the diameter expansion tube forms a fluid flow along the inner surface of the diameter expansion tube, so that the lining material can be efficiently heated or passed through the diameter expansion tube. Can be cooled.

  As the flow path forming means, it is preferable that the supply path is a flow path having at least a terminal end opened toward the inner surface of the expanded tube.

  As a result, the fluid is discharged from the supply path along the inner surface of the enlarged diameter tube, and forms a flow in a certain direction from one holding member to the other holding member along the inner surface of the enlarged diameter tube. It will be a thing.

  Moreover, you may provide the bulk member which prevents the distribution | circulation of the axial center part in the said enlarged diameter tube as the said flow path formation means along the axial center part of this expanded diameter tube.

  Thereby, the fluid supplied to the diameter expansion tube is blocked by the bulk member, and flows while avoiding the axial center portion of the diameter expansion tube. As a result, the fluid forms a flow in a certain direction from one holding member to the other holding member along the inner surface of the expanded diameter tube.

  In the lining device, it is preferable that the one holding member and the other holding member are connected by a connecting line that passes through the inside of the expanded tube, and the connecting line includes a heating element.

  With such a configuration, the diameter-expanding tube can be sufficiently expanded in the radial direction and can be restricted from extending more than necessary in the axial direction. Furthermore, it becomes possible to heat the fluid in the diameter-expanded tube supplementarily by the heating element provided in the connecting wire.

  Further, the existing pipe lining method in which the inner peripheral surface of the existing pipe is covered with a lining material by using the lining apparatus according to each of the above-described solving means and the existing pipe is rehabilitated is also within the scope of the technical idea of the present invention. That is, the lining material is a cylindrical body made of a fiber reinforced composite material using a thermoplastic resin as a matrix, and an insertion step of inserting the lining material into an existing pipe and arranging it at a repair target location; An arrangement step of arranging the expanded tube on the inner peripheral side of the lining material, supplying a heating fluid into the expanded tube, and heating the lining material without moving the lining device in the tube axis direction of the existing tube And expanding the diameter of the lining material and fixing it to the inner peripheral surface of the existing pipe, cooling the solidification of the lining material by supplying a cooling fluid into the diameter expansion tube, And a desorption step of discharging the cooling fluid of the diameter expansion tube to reduce the diameter of the diameter expansion tube and separating the diameter expansion tube from the lining material.

  By such an existing pipe lining method, in the diameter expansion step, it is possible to supply a sufficient amount of heat to heat the lining material by allowing the heating fluid to circulate over a wide range in the diameter expansion tube. This eliminates uneven heating. For this reason, the entire thermoplastic resin material can be melted and expanded in a relatively short time. In addition, since there is no need to move the inner diameter expansion tube in the direction of the tube axis with respect to the molten lining material, it is possible to expand the diameter of the lining material while maintaining a uniform thickness. High strength and water tightness can be provided. Furthermore, after the diameter expansion process, the lining material can be solidified as it is by feeding the cooling fluid into the diameter expansion tube, and it becomes possible to line the existing existing pipe efficiently and in a short time.

  In the present invention, for a lining material made of a fiber reinforced composite material using a thermoplastic resin as a matrix, the diameter of the lining material is uniformly heated and expanded by the flow of a fluid in a diameter expanding tube arranged on the inner peripheral side of the lining material. For this reason, it is possible to perform lining while stably expressing high strength and water tightness in a relatively short time.

It is explanatory drawing which shows the lining method using the lining apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the lining method with respect to the curved pipe line using the said lining apparatus. It is XX sectional drawing in FIG. It is sectional drawing which shows the next process of FIG. It is a side view which shows the lining apparatus which concerns on Embodiment 1, and is shown typically with the internal structure of a diameter expansion tube. It is sectional drawing which shows the lining apparatus and lining method which concern on Embodiment 2. FIG. The holding member of the lining apparatus which concerns on Embodiment 2 is shown, Fig.7 (a) is a perspective view, FIG.7 (b) is a side view. The other example of the holding member of the lining apparatus which concerns on Embodiment 2 is shown, Fig.8 (a) is a perspective view, FIG.8 (b) is a side view. It is a side view which shows the lining apparatus which concerns on Embodiment 3, and is shown typically with the internal structure of a diameter expansion tube. It is sectional drawing which shows the state which has arrange | positioned the lining apparatus which concerns on Embodiment 3, and a lining material to the existing pipe.

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

  FIG. 1 is an explanatory view schematically showing one process when lining the inner peripheral surface of an existing pipe using the lining apparatus according to the embodiment, and FIG. 2 is a schematic diagram showing one process of lining for a bent pipe line. It is explanatory drawing shown in. FIG. 3 is a cross-sectional view showing a state in which a lining material and a lining device are arranged on an existing pipe, and FIG. 4 is a cross-sectional view showing a diameter expansion process of the lining material.

  Below, the outline | summary of the lining material 1 which lines the internal peripheral surface of the existing pipe 10 is demonstrated first, Then, the lining apparatus 2 and the lining method of the existing pipe 10 using this lining apparatus 2 are demonstrated.

(Lining material)
A lining material 1 applied to a lining device 2 and a lining method for an existing pipe 10 according to an embodiment of the present invention is made of a fiber-reinforced composite material having a thermoplastic resin as a matrix, and has flexibility and is substantially cylindrical. It is formed into a shape.

  The lining material 1 as an example uses a large number of reinforcing fiber filaments aligned in one direction and a thermoplastic resin film as a base material resin, and these are integrated in a semi-impregnated state by heating and pressing. It can be formed using a sheet material of a semi-preg base material. That is, this sheet material is obtained by semi-impregnating a reinforced fiber filament with a molten thermoplastic resin film and integrating them. Since it is a sheet material, it is easy to cut and join in a fixed shape, and end portions of the sheet material are overlapped and joined to form a substantially cylindrical shape.

  In the lining material 1, a part of the process of forming the lining layer of the existing pipe 10 in which the thermoplastic resin material is impregnated between the reinforcing fiber filaments is performed in the stage before the lining construction, that is, in the molding process of the semi-preg base material in advance. It is what I did. Therefore, the time required for heating and pressurization at the lining construction site can be shortened, and it is not necessary to set the heating temperature of the lining material 1 excessively high, and sufficient strength can be stably expressed. It becomes. As a result, a uniform lining layer can be formed quickly and economically on the existing pipe 10.

  Moreover, the lining material 1 can also be formed with the fabric of the thermoplastic composite material which consists of a thermoplastic resin filament and a reinforced fiber filament. That is, the lining material 1 is in the form of a knitted fabric, a woven fabric (woven fabric), a braided fabric, or a non-woven fabric by a fiber bundle in which a thermoplastic resin filament is used as a base material resin and disposed in a reinforcing fiber filament bundle. It is configured and formed into a substantially cylindrical shape by sewing or the like.

  Any of the lining materials 1 as described above can be formed in various forms depending on the combination or structure of the material of the thermoplastic resin and the reinforcing fibers. Examples of the thermoplastic resin material applied to the lining material 1 include polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), or polyamide. (PA) etc. are mentioned. Examples of the reinforcing fiber include those made of glass fiber, carbon fiber, aramid fiber, ceramic fiber, metal fiber and the like. The form of the reinforcing fiber may be a continuous fiber or a short fiber, such as a roving in which strands obtained by converging thin filaments are aligned, and a chopped strand in which filaments are cut.

  In the lining material 1, for example, when polypropylene (melting point is about 160 to 170 ° C.) is adopted as a constituent material of the thermoplastic resin filament, the heating temperature in the lining process of the existing pipe 10 can be set to 180 ° C. preferable. When high-density or low-density polyethylene (melting point is 140 ° C.) is adopted as the constituent material of the thermoplastic resin filament, the heating temperature in the lining process of the existing pipe 10 is preferably set to 150 ° C.

  Further, the lining material 1 is not only formed by the thickness of the semi-preg base material or the fiber reinforced composite material itself such as a fabric, but also has a multi-layer structure in which a plurality of layers are superposed or different in kind. Then, it may be formed to have a predetermined thickness. The lining material 1 may have a configuration in which a coating layer made of a highly watertight material is added to the outer peripheral side, and is not limited to the above configuration.

(Lining equipment)
FIG. 5 is a side view showing the lining device 2 according to the first embodiment together with the internal structure of the diameter expansion tube 21.

  The lining device 2 is for rehabilitating the existing pipe 10 by lining the lining material 1 made of a fiber-reinforced composite material using a thermoplastic resin as a matrix on the inner peripheral surface of the existing pipe 10.

  In the illustrated embodiment, the lining device 2 includes a diameter-expanding tube 21 and holding members 23A and 23B at both ends thereof. In FIG. 5, the diameter-expanded tube 21 is shown in a partial cross section, and the internal structure is shown in perspective.

  The expanded tube 21 is a cylindrical body made of a flexible material, and can be arranged along the inner circumference of the lining material 1.

  The diameter-expanded tube 21 has both heat resistance that can withstand the molding temperature of the thermoplastic resin material and expandability for pressurizing the lining material 1 while being pressed against the lining material 1. In addition, the diameter-expanded tube 21 is preferably a material that can be easily detached from the solidified lining material 1 after the expansion. For example, it is preferable to apply a cylindrical body made of a material such as silicon rubber, polyimide, polyphenylene sulfide, or the like to the expanded diameter tube 21. Of these, silicon rubber is particularly preferable because of its excellent expandability and good heat resistance.

  The expanded tube 21 is a cylindrical body having a smaller diameter than the inner diameters of the existing tube 10 and the lining material 1 before being inserted into the existing tube 10. Moreover, the outer diameter of the expanded tube 21 is ensured by such a size that the lining material 1 can be pressed from the inside to the inner peripheral surface of the existing tube 10 during expansion.

  Holding members 23 </ b> A and 23 </ b> B are provided at both ends of the expanded diameter tube 21. The holding members 23 </ b> A and 23 </ b> B hold both ends of the enlarged tube 21 and maintain the inside of the enlarged tube 21 in a substantially airtight state with a built-in sealing material or the like. The holding members 23A and 23B have an outer diameter that can be inserted into the existing pipe 10, and an outer peripheral surface is formed of a curved body such as a spherical surface, a conical surface, or a truncated cone surface. The holding members 23A and 23B are formed of a synthetic resin material or a metal material having heat resistance and impact resistance.

  One holding member 23 </ b> A is provided with a supply path for supplying fluid into the enlarged diameter tube 21, and a fluid air supply pipe 3 is connected to a supply port 231 of the supply path.

  The other holding member 23 </ b> B is provided with a pressure controller 235 for controlling the fluid pressure in the enlarged tube 21 and a discharge path for discharging the fluid in the enlarged tube 21. A discharge port 233 of the discharge path is open to the outside of the diameter expansion tube 21.

  As the pressure controller 235, a well-known small controller used for a flow rate control device or the like can be applied. For example, a valve having a fluid flow rate adjustment and sealing function, and a spring and a diaphragm for setting the fluid pressure Etc. are preferably provided. If the inside of the expanded tube 21 does not reach the predetermined pressure, the pressure controller 235 of the holding member 23B closes the valve and closes the discharge port 233, assuming that the expanded tube 21 is not filled with fluid, and opens the discharge path. Let it be a sealed state. Then, when the fluid is filled in the diameter expansion tube 21 and reaches a predetermined pressure, the pressure controller 235 detects it and opens the valve, and discharges the fluid in the diameter expansion tube 21 from the discharge port 233 to the outside. . Thereby, the flow of the fluid in the direction of the holding member 23B from the holding member 23A is formed while maintaining the inside of the diameter expansion tube 21 at a predetermined pressure.

  In addition, the pulling wire 91 is connected to the outer surface of the holding member 23B. The holding member 23 </ b> B and the holding member 23 </ b> A are connected by a connecting line 25 that is inserted through the inside of the diameter expansion tube 21. The connecting wire 25 can be a heat-resistant metal wire or the like. Thereby, when the pulling wire 91 is pulled, the tensile force acts on the holding member 23A from the holding member 23B via the connecting wire 25, and the diameter-expanded tube 21 can be smoothly drawn into the pipe line. Yes. Moreover, by providing the connecting wire 25, the diameter-expanded tube 21 is prevented from expanding more than necessary in the tube axis direction.

  In the illustrated form, the connecting wire 25 is provided with a linear heating element 26. For example, a ribbon heater or a linear electric heater can be used as the linear heating element 26. The linear heating element 26 is attached to the connecting wire 25 by being wound spirally. Therefore, the linear heating element 26 can be flexibly following and deformed even in a bent pipe line, and does not hinder the flexibility of the diameter-expanded tube 21 and can correspond to pipes of various shapes. .

(Lining method)
Next, a lining method for the existing pipe 10 using the lining device 2 will be described.

  Prior to the lining operation, when there is running water such as sewage in the existing pipe 10, the running water is dammed by the damming member 101 and once removed from the pipeline. Furthermore, after conducting an in-pipe investigation in the existing pipe 10 to remove foreign matters such as deposits and wood chips existing in the existing pipe 10 and performing high-pressure water washing or the like, the following lining operation is started.

  In the form shown in FIG. 1, a winch 9 that winds the pulling wire 91 is installed on the ground side of the manhole M2. The pulling wire 91 is inserted into the existing pipe 10 from the manhole M2 and can be used for inserting the lining material 1 and arranging the lining device 2.

  As described above, the lining material 1 has flexibility and is formed in a substantially cylindrical shape. Since the lining material 1 has high flexibility, the lining material 1 can be folded into a flat shape and carried into a construction site. And the lining material 1 is inserted in the repair object location of the existing pipe 10 (insertion process).

  Next, the lining device 2 is pulled down to the bottom of the manhole M1 and disposed on the inner peripheral side of the lining material 1 (arrangement step). A traction wire 91 is connected to the holding member 23 </ b> B of the lining device 2 and is pulled in the direction of the manhole M <b> 2 by the winch 9. At this time, as shown in FIG. 3, the diameter-expanded tube 21 of the lining device 2 is not yet expanded, and can be easily inserted into the lining material 1. Thereby, the diameter expansion tube 21 of the lining apparatus 2 can be arrange | positioned inside the lining material 1. FIG.

  The air supply pipe 3 is connected to the supply port 231 of one holding member 23 </ b> A of the lining device 2. As shown in FIG. 1, on the ground side of the manhole M1, a heating gas generator 6 for generating a heating gas and an air compressor 7 for compressing air to generate pressurized air are installed. ing. The heated gas generated by the heated gas generator 6 and the compressed air generated by the air compressor 7 are mixed and supplied to the air supply pipe 3. Further, in the process of supplying the heated gas and the pressurized air to the air supply pipe 3, an adjustment valve (not shown) may be provided to supply the mixed gas while controlling each flow rate.

  A generator 8 is installed on the ground side of the manhole M1 and an electric cable 4 is connected thereto. An electric cable 4 is connected to the holding member 23 </ b> A of the lining device 2 so that electricity can be supplied to the linear heating element 26.

  Next, a mixed gas of heated gas and pressurized air is supplied from the air supply pipe 3 into the enlarged diameter tube 21. When the mixed gas is supplied into the diameter expansion tube 21, the diameter expansion tube 21 expands as shown in FIG. 4 (diameter expansion process).

  In the diameter expansion step, a mixed gas having a temperature equal to or higher than the melting point of the thermoplastic resin material included in the lining material 1 is supplied. The lining material 1 contacts the expanded diameter expanding tube 21 and is heated by the mixed gas in the diameter expanding tube 21. Thereby, the thermoplastic resin material of the lining material 1 is melted.

  The lining material 1 is also softened by melting and expanded in diameter by the pressurizing action by the expanded tube 21. Thereby, the lining material 1 adheres to the inner surface of the existing pipe 10. By maintaining the expanded state of the expanded tube 21, the contact state between the lining material 1 and the existing tube 10 is also maintained as it is, and a uniform pressure can be applied over a wide range and uniform.

  The pressure required to shape the lining material 1 is appropriately set depending on the strength of the existing pipe and the thermoplastic resin material constituting the lining material 1. Moreover, the pressure of the mixed gas in the diameter expansion tube 21 can be controlled by the pressure controller 235 of the holding member 23B. In the lining device 2, a mixed gas having a constant temperature and a constant pressure is supplied to the diameter-expanded tube 21 for a certain period of time.

  While the inside of the expanded tube 21 is less than the set pressure, the discharge path (discharge port 233) of the holding member 23B is sealed and filled with the mixed gas from the air supply pipe 3. When the inside of the diameter expansion tube 21 reaches the set pressure or more, the discharge port 233 is opened, and the discharge of the mixed gas is started from the inside of the diameter expansion tube 21 via the pressure controller 235. Thereby, the flow of the mixed gas of constant temperature can be formed in the diameter expansion tube 21 from the holding member 23A to the holding member 23B while maintaining the positive pressure state in the diameter expansion tube 21.

  Moreover, since the mixed gas of heated gas and pressurized air is continuously supplied into the diameter expansion tube 21, even if heat exchange is performed by heating the lining material 1, the temperature drop of the mixed gas is suppressed. Is done. Therefore, rapid and uniform melting is possible over the entire lining material 1.

  In addition, when the pipe diameter of the existing pipe 10 is comparatively large, or when the length of the repair object location is long, it is preferable to use the linear heating element 26 as auxiliary heating means. Thereby, the temperature fall of the mixed gas in the diameter expansion tube 21 can be suppressed, and the uniform heating and pressurization with respect to the lining material 1 can be performed still more reliably.

  After maintaining the above positive pressure state for a certain time, the lining material 1 is cooled and solidified (cooling step). That is, supply of heated gas is stopped and only pressurized air is supplied to the air supply pipe 3. With the supply of pressurized air, the mixed gas is discharged while maintaining the positive pressure state in the expanded diameter tube 21, causing a temperature drop. Thereby, the lining material 1 is cooled and solidified in a state of being in close contact with the inner peripheral surface of the existing pipe 10, and the shape thereof is maintained.

  After the lining material 1 is solidified, the pressurized air in the expanded tube 21 is discharged. Thereby, the pressure in the diameter expansion tube 21 falls, the diameter expansion tube 21 shrinks, and it leaves | separates from the lining material 1 (separation process). And the reduced diameter expansion tube 21 is pulled out from the inner peripheral side of the lining material 1, and the lining apparatus 2 is removed. Thereby, the inner peripheral surface of the existing pipe 10 can be covered with the composite material of the lining material 1, and the lining operation is completed.

  In such a lining method, the lining material 1 is applied not only to the straight tubular existing pipe 10 shown in FIG. 1 but also to the bent pipe shown in FIG. Can be lined with. At this time, since the diameter expansion tube 21 has flexibility, the lining device 2 can be easily inserted without interfering with a curved portion or a bent portion of the conduit. In addition, the diameter-expanded tube 21 is sufficiently expanded by the supplied pressurized air or the like and can be deformed into a shape along a curved portion or a bent portion of the conduit, so that the entire diameter is in close contact with the lining material 1. Can be heated and pressurized.

(Other Embodiment of Lining Device)
Next, another embodiment of the above-described lining device 2 will be described with reference to the drawings. FIG. 6 is a cross-sectional view schematically showing the lining device 2 according to the second embodiment.

  In the lining device according to the first embodiment, the connecting wire 25 is provided in the diameter expansion tube 21, and the linear heating element 26 is disposed on the connecting wire 25. In the following embodiments, instead of such a configuration, one holding member 23A of the lining device 2 has a flow path forming unit. The other components of the lining device 2 such as the diameter-expanding tube 21, the other holding member 23B, and the air supply pipe 3 are the same as those in the first embodiment. Therefore, in FIG. The detailed description is omitted. In FIG. 6, the holding members 23 </ b> A and 23 </ b> B are shown by omitting hatching indicating a cross section.

  The lining device 2 according to the second embodiment includes a flow path forming means for guiding the fluid along the inner surface of the diameter expansion tube 21. That is, as one of the flow path forming means, a fluid supply path 28 whose end is opened toward the inner surface of the enlarged tube 21 is provided in one holding member 23A.

  As shown in FIG. 6, the holding member 23 </ b> A at one end of the expanded tube 21 is provided with a plurality of supply paths 28. The supply path 28 is formed as a flow path extending from the one end face 237 of the holding member 23 </ b> A to the other end face 238 facing the inside of the enlarged diameter tube 21. In the illustrated form, the starting end of the supply path 28 is connected to the air supply pipe 3. On the other hand, the terminal end of the supply path 28 is formed to open along the outer peripheral portion of the other end surface 238 of the holding member 23A.

  More specifically, as shown in FIGS. 7A and 7B, the supply path 28 is provided in a branched manner in the holding member 23A. That is, the starting end portion of the supply path 28 is provided in a cylindrical shape at the axial center, and is branched into a plurality of flow paths 281. Each flow path 281 is disposed so that the end portion is uniformly opened to the outer peripheral portion of the other end surface 238 of the holding member 23A. As a result, the fluid flowing through the supply path 28 is distributed and discharged radially from the one end surface 237 toward the other end surface 238.

  The supply path 28 may be configured as shown in FIGS. 8A and 8B. In this case, the supply path 28 is formed in a truncated cone-shaped slit shape in the holding member 23A. The supply path 28 is formed in a cylindrical shape on the start end side from the one end surface 237 of the holding member 23A to the axial center portion. The supply path 28 includes a truncated cone-shaped slit-shaped flow path 282 that extends in a conical shape from the intermediate portion and increases in diameter toward the end portion. The terminal end of the channel 282 is opened in a circular shape along the outer peripheral portion of the other end surface 238 of the holding member 23A. The other end surface 238 of the holding member 23A is provided with a bridge 283 that partially closes and connects the opening of the flow path 282.

  By providing such a supply path 28, when supplying the mixed gas of heated gas and pressurized air from the air supply pipe 3 into the enlarged diameter tube 21 in the enlarged diameter process, the mixed gas is expanded in diameter. It is discharged evenly toward the inner peripheral surface of the tube 21. In the expanded tube 21, a mixed gas flow is formed along the inner peripheral surface in the direction of the holding member 23B. As a result, the inner peripheral surface of the diameter-expanded tube 21 is uniformly heated and pressurized and expanded.

  By providing such a flow path forming means in the holding member 23A of the lining device 2, a sufficient temperature rise for melting the lining material 1 can be ensured, and the thermoplastic resin material is uniformly melted. It becomes possible to melt quickly. In addition, since it does not take a long time to heat the entire lining material 1, the construction can be performed in a short time. Similarly, also in the cooling process of the lining material 1, the temperature in the diameter expansion tube 21 can be efficiently lowered, and the lining material 1 can be cooled and solidified in a short time.

  Further, as another example of the flow path forming means, a configuration in which the bulk member 29 is provided along the axial center portion of the diameter expansion tube 21 may be employed. FIG. 9 is an explanatory diagram illustrating the lining device 2 according to the third embodiment.

  In this lining device 2, the bulk member 29 is disposed at the axial center from one holding member 23 </ b> A to the other holding member 23 </ b> B of the diameter-expanded tube 21. The bulk member 29 is a columnar body having a substantially circular cross section. The bulk member 29 may be disposed without a gap with respect to the holding members 23A and 23B, or may be disposed with a gap with respect to the holding members 23A and 23B via the connecting member 291. The holding member 23A is provided with a supply path 28 in the axial center portion.

  As a material of the bulk member, for example, a metal material such as aluminum, copper, or iron, or a synthetic rubber material is preferable. More preferably, the surface of the bulk member 29 has a heat storage property and does not hinder the temperature rise in the enlarged diameter tube 21, and the bulk member 29 has a heat insulation property and the fluid in the enlarged diameter tube 21. It is to make it the material which does not reduce the heat exchange efficiency. Therefore, it is desirable that the bulk member 29 be formed in a solid state rather than being formed in a hollow cross section. When the bulk member 29 is solid, it is preferable to fill the interior with aluminum, copper, or the like having a higher thermal conductivity than air.

  By providing the bulking member 29 in the lining device 2, it is preferable to reduce the volume of the diameter-expanded tube 21 in the range of 30% to 90%. Thereby, the range which can distribute | circulate the fluid within the diameter expansion tube 21 can be reduced significantly. Further, since the bulk member 29 hinders the flow of the fluid in the axial center portion in the enlarged diameter tube 21, the fluid flow is generated along the inner peripheral surface of the enlarged diameter tube 21.

  Therefore, when supplying the mixed gas of the heated gas and the pressurized air from the air supply pipe 3 into the expanded diameter tube 21 in the expanded diameter process, the mixed gas is mixed with the outer peripheral surface of the bulk member 29 and the expanded diameter tube 21. It flows between the inner peripheral surface. Thereby, in the enlarged tube 21, the flow of the mixed gas toward the holding member 23B is formed along the inner peripheral surface, and the inner peripheral surface of the enlarged tube 21 is heated and pressurized evenly. It becomes.

  As described above, even when the bulk member 29 as the flow path forming means is provided in the diameter-expanded tube 21, a sufficient temperature rise for melting the lining material 1 can be secured, and the thermoplastic resin The material can be uniformly melted and rapidly melted. Further, it is not necessary to take a long time to heat or cool the entire lining material 1, and the construction time can be shortened.

  Such flow path forming means can be used in combination with the connecting line 25 and the linear heating element 26 shown in FIG. In other words, for example, in the lining device 2 according to the second embodiment, the connecting wire 25 and the linear heating element 26 may be further provided in the axial center portion of the diameter expansion tube 21. In this case, the flow of the mixed gas can be formed along the inner peripheral surface of the expanded tube 21 while suppressing the temperature drop of the mixed gas in the expanded tube 21, and the lining material 1 can be more reliably secured. It is possible to perform uniform heating and pressurization.

(Example)
Next, an embodiment in which the lining device 2 provided with the bulk member 29 is used as the flow path forming means will be described. FIG. 10 is a cross-sectional view showing a state in which the lining device 2 and the lining material 1 are arranged on the existing pipe 10.

  As the lining material 1, a material having a thickness of 2.5 mm made of a fiber reinforced composite material using polypropylene (melting point: about 160 to 170 ° C.) as the thermoplastic resin material and glass fiber as the reinforcing fiber was used. In addition, the inner diameter of the existing pipe 10 is 100 mm, while the lining material 1 having an initial inner diameter of 80 mm is used.

  In the expanded tube 21 of the lining device 2, a bulk member 29 is provided at the axial center. The bulk member 29 is a solid cylindrical body made of an aluminum material and has an outer diameter of 55 mm.

  A high temperature gas, which is a mixed gas of heated gas and pressurized air, was supplied from the air supply pipe 3 into the expanded diameter tube 21. The temperature of the hot gas was 350 ° C. The fluid pressure and pressurizing pressure in the diameter expansion tube 21 in the diameter expansion process were set as 50 kPa.

  Thereby, in the diameter expansion process of the lining material 1, a high-temperature gas flow at 350 ° C. flows from the holding member 23 </ b> A to the holding member 23 </ b> B in the diameter expansion tube 21 while maintaining the positive pressure state in the diameter expansion tube 21. And the existing pipe 10 was lined.

  Further, the time required for melting the lining material 1 in the diameter expansion process was measured. The measurement points of the molten state of the lining material 1 are two points, the point A near the holding member 23A and the point B near the holding member 23B shown in FIG. 10, and the bulk member 29 is not provided. The time required for melting was compared with the case of 29.

  As a result, at the measurement point A, the melting time of the lining material 1 required about 20 minutes when the bulk member 29 was not provided, whereas about 11 minutes was sufficient when the bulk member 29 was provided. Has been greatly shortened.

  Further, at the measurement point B, complete melting of the lining material 1 could not be confirmed when the bulk member 29 was not provided, whereas when the bulk member 29 was provided, complete melting of the lining material 1 after about 43 minutes. Was confirmed.

  As described above, when the bulk member 29 as the flow path forming means is provided in the diameter-expanded tube 21, the lining material 1 can be melted quickly and reliably compared to the case where the bulk member 29 is not provided. It was confirmed that the lining material 1 can be shaped in a short time.

  As described above, since the lining material 1 is configured using the lining material 1 made of a thermoplastic composite material, in the lining construction process, the thermoplastic resin material and the reinforcing fibers contained in the lining material 1 are lining. A complete impregnation state can be achieved in a relatively short time by the heating and pressurizing action of the apparatus 2. Therefore, a configuration in which the reinforcing fibers are dispersed in the thermoplastic resin material can be easily obtained over the entire lining material 1, and the construction time for that can be shortened. Moreover, since it is not necessary to raise the heating temperature with respect to the lining material 1 excessively, and it is not necessary to move the lining apparatus 2 to a pipe-axis direction, it can also avoid that the thermoplastic resin material flows and becomes uneven thickness.

  INDUSTRIAL APPLICATION This invention can be utilized suitably for the rehabilitation of the existing pipe | tube using the lining material which consists of a thermoplastic composite material.

DESCRIPTION OF SYMBOLS 1 Lining material 2 Lining apparatus 21 Expanding tube 23A Holding member 231 Supply port 23B Holding member 233 Discharge port 235 Pressure controller 25 Connecting wire 26 Linear heating element 28 Supply channel 29 Bulk member 3 Air supply tube 4 Electric cable 6 Heating gas Generator 7 Air compressor 8 Generator 9 Winch 91 Pulling wire 10 Existing pipe 101 Damping member M1, M2 Manhole

Claims (6)

A lining device for lining an existing pipe by lining a cylindrical lining material made of a fiber-reinforced composite material using a thermoplastic resin as a matrix on an inner peripheral surface of the existing pipe,
An expanded tube disposed along the inner periphery of the lining material and having expandability and heat resistance, and holding members that respectively close and hold both ends of the expanded tube,
One holding member is provided with a supply path for supplying a fluid into the diameter expansion tube and connected to a fluid supply line,
The other holding member is provided with a pressure controller for controlling the fluid pressure in the expanded diameter tube and a discharge path for discharging the fluid in the expanded diameter tube, and the fluid is passed through the pressure controller. Can be discharged,
A lining device that forms a fluid flow from the one holding member toward the other holding member and generates a positive pressure in the diameter-expanding tube. The lining device according to claim 1,
A lining apparatus comprising flow path forming means for guiding the fluid along the inner surface of the diameter-expanded tube. The lining apparatus according to claim 2,
As the flow path forming means, the supply path is a flow path in which at least a terminal end is a flow path that opens toward the inner surface of the expanded diameter tube. The lining apparatus according to claim 2,
2. A lining device according to claim 1, wherein a bulk member that prevents the flow of the axial center portion in the expanded diameter tube is provided along the axial center portion of the expanded diameter tube as the flow path forming means. The lining device according to claim 1 or 2,
The lining device characterized in that the one holding member and the other holding member are connected by a connecting line inserted through the inside of the diameter-expanded tube, and a heating element is provided on the connecting line. A lining method for an existing pipe that covers the inner peripheral surface of an existing pipe with a lining material using the lining device according to any one of claims 1 to 5, and regenerates the existing pipe,
The lining material is a cylindrical body made of a fiber-reinforced composite material using a thermoplastic resin as a matrix, and an insertion step of inserting the lining material into an existing pipe and placing it at a repair target location;
An arrangement step of arranging the expanded tube of the lining device on the inner peripheral side of the lining material;
A heating fluid is supplied into the diameter expansion tube, and the lining material is heated and pressurized without moving the lining device in the tube axis direction of the existing pipe, and the diameter of the lining material is expanded to increase the inner peripheral surface of the existing pipe. A diameter expansion process to be fixed to
A cooling step of solidifying the lining material by supplying a cooling fluid into the diameter expansion tube;
A lining method for an existing pipe, comprising: a detaching step of discharging the cooling fluid of the diameter-expanded tube to reduce the diameter-expanded tube and separating the diameter-expanded tube from the lining material.

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