JP5721932B2 - Pipe rehabilitation material and existing pipe rehabilitation method using the pipe rehabilitation material - Google Patents

Description

  The present invention relates to a tubular pipe rehabilitation material that is introduced into an existing pipe in an uncured state and is cured in the existing pipe, and further relates to an existing pipe rehabilitation method using the pipe rehabilitation material.

  In Japan, sewerage systems are installed at a high penetration rate, but maintenance of aging sewer pipes is an important project. In general, for pipes buried in the ground, such as sewer pipes, it is inevitable that changes over time, for example, generation of steps due to misalignment of joints, changes in diameter, and the like occur. In addition, even if no deformation occurs, replacement is required as it ages, and further, a transition to a pipe having a larger diameter is required in order to increase the size of the pipe. Under such various circumstances, the existing pipes need to be repaired at a predetermined time.

  As a technique for repairing the existing pipe, a method of rehabilitating the existing pipe while leaving the ground unopened, for example, introducing the pipe rehabilitation material in an uncured state into the existing pipe by reversing or drawing in, and then compressed air, etc. There is known a rehabilitation method in which the diameter is expanded and brought into close contact with the inner wall surface of the pipeline, and then the resin is cured by light irradiation or heat irradiation inside the lining pipe.

  In the repair of existing pipes using pipe rehabilitation materials as described above, base materials such as felt and glass fiber mats are impregnated with resin to form cylindrical basic components, which are introduced into existing pipes and pressurized. In a state where the diameter is expanded using air or the like and in close contact with the existing pipe, it is cured to form a new pipe (rehabilitation pipe) in the existing pipe.

  For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 6-246830) and Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-188818), such a curable lining pipe is inverted and advanced by pressurized air or warm water. A lining method for repairing a pipe after being introduced into an existing pipe and then cured by heat or light is disclosed.

  Further, in Patent Document 3 (Japanese Patent No. 4076188), as a duct lining method, a composite material layer having a filament of thermoplastic material and a filament of reinforcing fiber, and a thermoplastic material layer outside this layer are further provided. Disclosed is a method that includes the step of inserting a liner that includes the duct into a duct. The liner is heated to melt the thermoplastic filament, and then the liner is pressurized from the inside to contact the duct, and the liner is cured while the liner is in contact with the duct. It is to repair.

JP-A-6-246830 JP 2004-188818 A Japanese Patent No. 4076188

  However, in the case of existing pipes with the conventional heating process and light irradiation process described above, the temperature of the pipe rehabilitation material must be increased to a desired temperature inside the existing pipe, and the desired temperature state must be maintained for a predetermined time. I must. That is, in the case of a pipe rehabilitated material impregnated with a thermosetting resin, it is accompanied by heating work such as hot water, hot air, or steam injection or blowing into the pipe in the process until curing, In the case of a tube rehabilitated material impregnated with resin, it involves light irradiation with an ultraviolet lamp or the like.

  In order to appropriately perform such a curing operation, the resin impregnated in the pipe rehabilitation material must be set to an appropriate temperature, for example, 70 to 80 ° C., and the temperature must be increased. In other words, in order to ensure an accurate hardening state by heating, it is necessary to appropriately raise the temperature and maintain the temperature. However, the existing pipes are buried in the ground, and the existing pipes are generally affected by the effects of underground temperature and groundwater. The temperature is about 15 ° C. to 18 ° C. There is also a situation where it is even lower during cold weather.

  Therefore, under the influence of the low temperature of the existing pipe, the thermosetting pipe rehabilitation material may cause poor curing. Even in the case of a photo-curing tube rehabilitation material, the tube rehabilitation material is irradiated with light of a predetermined wavelength range, and the curing reaction starts. The surface temperature is desirably about 30 to 50 ° C. Therefore, even in the case of a photo-curing tube rehabilitation material, the diameter is expanded during the curing operation and is in close contact with the existing tube. There was also a fear.

  Furthermore, with thermoplastic pipe rehabilitation materials, generally, a tubular body is formed by knitting fibers made of thermoplastic material and glass fibers as a core material, or knitting glass fibers coated with a thermoplastic resin. And the basic component of the pipe rehabilitation material is formed. Then, this is introduced into an existing pipe, expanded and heated (about 150 ° C. to 200 ° C.), the thermoplastic material portion is melted and integrated with a core material such as glass fiber, and finally the temperature The rehabilitation pipe is completed by descending. Therefore, in the case of a thermoplastic pipe rehabilitation material, a higher temperature state is required than in the case of the above-described thermosetting pipe rehabilitation material, and similarly, the influence of the temperature of a low temperature existing pipe must be suppressed. Therefore, when a sufficient temperature rise cannot be obtained, an accurate molten state cannot be obtained, and there is a possibility that a poor installation state may occur.

  The present invention has been made to solve the above-described problem, and is capable of accurately avoiding the hardening of the pipe rehabilitation material and the poor installation state due to the temperature of the existing pipe, and the pipe rehabilitation material. To provide an existing pipe rehabilitation method using

In order to achieve the above object, the pipe rehabilitation material according to claim 1 is:
In a tubular pipe rehabilitation material that is repaired by forming a rehabilitation pipe in the existing pipe after being introduced into the existing pipe to be repaired, the pipe rehabilitation material includes an impregnated resin layer, and The inner and outer peripheral surfaces of the impregnated resin layer have an inner peripheral coating film and an outer peripheral coating film, and as the outermost layer member, a heat insulating layer having a lower thermal conductivity than the other constituent members of the pipe renewal material is provided, The layer is characterized by comprising an intermediate layer formed of nylon and a layer formed of polyethylene formed inside and outside the intermediate layer .

According to the pipe rehabilitation material having such a configuration, a heat insulation layer having a low thermal conductivity exists in the outermost layer on the existing pipe side in a state where it is installed in the existing pipe to be repaired. It is possible to reduce the influence on the material side. That is, even when the pipe rehabilitation material comes into close contact with the inner peripheral surface of the existing pipe, it comes into contact with the existing pipe through the heat insulating layer, and the influence of the temperature of the existing pipe can be suppressed as much as possible. Therefore, compared with the conventional pipe rehabilitation material, the occurrence of poor curing, poor installation condition, etc. is reduced, and the reliability of the quality of the completed rehabilitation pipe is improved. By using two types of layers having heat insulation properties and combining nylon layers that are relatively excellent in heat resistance, a good heat insulation effect can be secured. And a favorable heat insulation effect is securable by using two types of layers which have heat insulation, and combining the nylon layer which is comparatively excellent in heat resistance.

The pipe rehabilitation material according to claim 3 is :
In a tubular rehabilitation material that is repaired by forming a rehabilitation pipe in the existing pipe after being introduced into the existing pipe to be repaired, as the outermost layer member, other than the pipe rehabilitation material A heat insulating layer having a lower thermal conductivity than that of the structural member is provided, and the heat insulating layer is formed by adhering stable inorganic fine particles to either or both of the inner surface and the outer surface. . Thereby, it becomes possible to further secure air between the main body of the pipe rehabilitation material and / or between the existing pipe and obtain a heat insulating action.

The existing pipe rehabilitation method using the pipe rehabilitation material according to claim 3 is:
A tubular pipe rehabilitation material that is repaired by forming a rehabilitated pipe in the existing pipe after being introduced into the existing pipe to be repaired, the impregnated resin layer, and the impregnated resin layer The inner and outer peripheral surfaces have an inner peripheral coating film and an outer peripheral coating film, and as the outermost layer member, a heat insulating layer having a lower thermal conductivity than other constituent members of the pipe rehabilitation material is provided, A pipe that draws and introduces a pipe rehabilitation material composed of an intermediate layer formed of nylon and a layer formed of polyethylene formed inside and outside the intermediate layer into one of the existing pipes. A rehabilitation material introduction step, a diameter expansion step of expanding the introduced pipe rehabilitation material with a heat insulation layer in the existing pipe, and a tube rehabilitation material curing step of curing the expanded pipe rehabilitation material with a heat insulation layer. It is characterized by that.

According to such a configuration, the pipe rehabilitation material in which the heat insulation layer is formed on the outermost layer is already drawn into the existing pipe, and a known diameter expansion and hardening process is performed between the existing pipe and the pipe rehabilitation material. The influence of the low temperature state of the existing pipe can be reduced by interposing a heat insulating layer. Therefore, it is possible to complete a high-quality rehabilitation pipe that does not deteriorate due to poor curing or poor melting, and a highly reliable existing pipe rehabilitation method can be obtained .

The existing pipe rehabilitation method using the pipe rehabilitation material according to claim 4 is:
A tubular pipe rehabilitation material that is repaired by forming a rehabilitated pipe in the existing pipe after being introduced into the existing pipe to be repaired, the impregnated resin layer, and the impregnated resin layer The inner and outer peripheral surfaces have an inner peripheral coating film and an outer peripheral coating film, and as the innermost layer member, a heat insulating layer having a lower thermal conductivity than the other constituent members of the pipe renewal material is provided, A pipe rehabilitation material introducing step of introducing a pipe rehabilitation material composed of an intermediate layer formed of nylon and a layer formed of polyethylene formed inside and outside the intermediate layer into the existing pipe; A diameter increasing step of expanding the pipe reintroduced material with the heat insulation layer introduced in the reverse direction in the existing pipe, and a step of hardening the rehabilitated material with the diameter of the expanded pipe renewal material with the heat insulating layer. .

According to such a configuration, since the pipe rehabilitation material is previously configured to have a heat insulating layer as the innermost layer, it is possible to perform a so-called reversal introduction operation of introducing the rehabilitation material into the existing pipe while reversing it. And about the effect | action of the pipe rehabilitation material after installation, it is the same as that of the rehabilitation method by Claim 3 , and it is possible to install a high quality rehabilitation pipe quickly .

The existing pipe rehabilitation method using the pipe rehabilitation material according to claim 5 is:
A tubular pipe rehabilitation material that is cured after being introduced into an existing pipe to be repaired to form a rehabilitation pipe within the existing pipe, and has an impregnation resin layer and inner and outer peripheral surfaces of the impregnation resin layer. As a step before introducing the pipe rehabilitation material having the coating film and the outer peripheral coating film into the existing pipe, it has an outer diameter that can be in close contact with the inner side surface of the existing pipe at the time of diameter expansion. A heat-insulating cylindrical body composed of an intermediate layer with low thermal conductivity and made of nylon and a layer of polyethylene formed inside and outside the intermediate layer is introduced into the existing pipe A heat insulating tubular body introduction step, and after the heat insulating tubular body introduction step, the pipe rehabilitation material is drawn into the heat insulation tubular body or inverted and the heat insulation existing on the pipe rehabilitation material and outside thereof. Expanding the diameter of the tube and then curing the tube rehabilitation material. The features.
In this rehabilitation method, the heat insulation layer and the main part of the pipe rehabilitation material are separately and sequentially introduced into the existing pipe, and it is possible to install the pipe rehabilitation material with the heat insulation layer even by such a process. The effect is the same as in claims 3 and 4 .

  As described above, according to the pipe rehabilitation material and the existing pipe rehabilitation method using the pipe rehabilitation material according to the present invention, since the heat insulating layer is interposed between the pipe rehabilitation material and the existing pipe, The influence of the low temperature can be reduced, and defects in the cured state and installation state of the pipe rehabilitating material can be avoided accurately. Thereby, in the completion process of a rehabilitation pipe | tube, the reliability of the existing pipe renovation operation | work which needs to harden or melt | melt a resin layer exactly by temperature control improves.

It is a schematic sectional drawing which shows the structure of the pipe renovation material which concerns on embodiment of this invention. It is a schematic perspective view which shows the structure of the pipe renovation material which concerns on embodiment of this invention. It is drawing operation explanatory drawing at the time of installing the pipe renovation material which concerns on embodiment shown in FIG. 1, FIG. 2 to a sewer main. It is a general | schematic fragmentary sectional view which shows the state in which the diameter-expansion process was performed after drawing-in operation of a pipe renovation material. It is explanatory drawing which shows inversion introduction to the existing pipe of pipe renovation material. It is explanatory drawing which shows other introduction operation | movement to the existing pipe of pipe renovation material.

  Hereinafter, embodiments will be described in detail with reference to the drawings. 1 and 2 show an embodiment of a pipe rehabilitation material according to the present invention. FIG. 1 is a sectional view in the pipe axis direction, and FIG. 2 is a partially omitted perspective view. In this embodiment, the pipe rehabilitation material is an example of a pipe rehabilitation material in which a base material is impregnated with a thermosetting resin to form an impregnated resin layer, and a coating film is provided on the inner and outer circumferences. ing. In the figure, the ratio of the thickness of each layer is different from the actual scale for clarity of the figure.

  As shown in the figure, the pipe rehabilitation material 10 is mounted in close contact with the impregnated resin layer 12 in which a tubular base material formed of felt or glass fiber is impregnated with a thermosetting resin, and the inner and outer peripheral surfaces thereof. A basic component 18 having inner and outer peripheral coating films 14 and 16 is provided. Examples of the curable resin impregnated in the basic component 18 include unsaturated polyester resins and vinylester resins.

  What is characteristic is that the heat insulating layer 20 is provided as the outermost layer on the outer peripheral side of the basic component 18. The heat insulating layer 20 can be formed of, for example, a material such as polyethylene, nylon, or polyester, and at least its thermal conductivity is lower than that of the basic component 18. In addition, the thickness of the heat insulation layer 20 is normally set to about 0.5 mm to 1 mm. The heat insulation layer 20 is made of a material that can ensure adhesion with the outer peripheral covering film 16 of the basic component 18, so that the stability of the installed state of the entire pipe rehabilitation material 10 is also ensured.

  Although not shown, the heat insulating layer 20 may have a two-layer laminated structure, in which nylon having higher heat resistance is installed on the inside and a polyethylene layer is formed on the outside. Furthermore, the layer formed of nylon is used as an intermediate layer, and the inner and outer layers thereof are formed of polyethylene, so that the action of the heat insulating layer can be stably exhibited. Moreover, it is also possible to form the whole with a polyester material, and to constitute a part layer or the whole as a felt-like layer. In this way, by forming at least a part of the layer in the felt form, it is possible to appropriately form an air layer with a simple configuration, and it is possible to more appropriately secure the heat insulating action.

  Also, in order to withstand higher temperatures, the heat insulating layer is made of a resin having excellent heat resistance, such as polyethylene terephthalate resin, polystyrene resin, cross-linked polyethylene resin, polycarbonate resin, fluororesin, polyetherimide. It is also suitable to employ a resin or the like.

    In addition, as an aspect for further improving the heat insulating performance, stable inorganic fine particles can be provided in the middle of the laminated heat insulating material. As the inorganic fine particles, it is also preferable to employ porous, hollow foamable particles, thereby forming an air layer with good heat insulation in the heat insulation layer. Moreover, an air part can be ensured on the inner surface of the heat insulation layer 20 by spraying and sticking fillers (fillers) and inorganic pigments, and the heat insulation effect can be further improved.

  The present embodiment is not limited to the case of the thermosetting pipe rehabilitation material as described above, but can also be applied to the case of a photo-curing pipe rehabilitation material or a thermoplastic pipe rehabilitation material. In the case of a thermoplastic pipe rehabilitated material, as described above, since a higher heat state is required, a heat insulating layer in which the inorganic fine particles are sprayed and adhered is suitable. Examples of the thermoplastic resin include polyethylene, polyvinyl chloride, polypropylene, and polybutadiene.

  In addition, although the thickness of the said basic structural part 18 changes variously with the conditions of the existing pipe installed, it is about 3-30 mm normally.

  FIG. 3 shows an example in which the pipe rehabilitation material 10 shown in FIGS. 1 and 2 is introduced into the sewer main pipe 100 to be repaired. This example shows an example of the sewer main 100 as an existing pipe to be repaired. As illustrated, a sewer main 100 is disposed between manholes 600 and 700 installed at a predetermined interval. The case where this sewer main 10 is repaired using the method of the present invention will be described as an example.

  As shown in the figure, for example, the tube rehabilitation material 10 impregnated with a thermosetting resin is sequentially drawn out from the state of being wound and stored in the storage case 11 and fixed to the wire 500 in an uncured state. It is drawn in the direction of arrow 800. Then, after this pipe rehabilitation material 10 introduction step, the diameter of the pipe rehabilitation material 10 is increased by a known method, for example, by blowing pressurized air into the interior, and the outer peripheral surface of the pipe rehabilitation material 10 is sewer main 100. It adheres to the inner peripheral surface 100a.

  FIG. 4 is a partial cross-sectional view of a state in which the pipe rehabilitation material 10 is expanded and in close contact with the sewer main pipe 100. As shown in the figure, in this expanded state, for example, a hose is introduced into the pipe, A curing process is performed in which hot water is sprayed from a predetermined portion of the hose, steam is sprayed in the tube, and hot air is blown into the tube (at 200) to cure the tube. According to the existing pipe rehabilitation method using such a pipe rehabilitation material 10, at least the basic component 18 impregnated with resin in a state where the pipe rehabilitation material 10 is installed in the sewer main pipe 100 to be repaired. Insulating layer 20 having a lower thermal conductivity is present between sewer main 100.

  That is, as can be understood from FIG. 4, even when the pipe rehabilitation material 10 is in close contact with the inner peripheral surface 100 a of the sewer main pipe 100, the impregnated resin layer 12 of the basic component portion 18 has the heat insulating layer 20 and the outer peripheral covering film 16. It is in contact with the sewer main 100. Therefore, the influence of the temperature (symbol 300) of the sewer main 100 having a temperature as low as 10 degrees is effectively reduced by the heat insulating layer 20, the temperature rise due to heating is accurately secured, and the curing failure due to insufficient temperature rise. Occurrence of poor installation conditions and the like are avoided.

  Next, FIG. 5 shows another example of the installation operation in the sewer main 100 of the pipe rehabilitation material 10. As shown in the drawing, the pipe rehabilitation material 10 with a heat insulating layer is installed by reversal introduction. When this reversal introduction is performed, the formation of the pipe rehabilitation material 10 is different from the case of FIGS. 1 and 2, and the heat insulating layer 20 is formed in advance as the innermost layer of the pipe rehabilitation material 10. That is, it is attached to the outer surface of the inner peripheral coating film 14. In this state, it is introduced into the sewer main 100 while being inverted.

  From this state, a diameter expansion operation is performed as necessary, the installation of the pipe rehabilitation material is completed, and a curing step by final heating or the like is performed. And the effect | action of this pipe renovation material 10 with the heat insulation layer 20 is the same as that of what is obtained by the operation | movement shown in the said FIG. 3, The effect | action is also the same as that of the above-mentioned.

  Next, FIG. 6 shows another example of the installation operation in the sewer main 100 of the pipe renovation material 10. As shown in the figure, the pipe renewal material 10 with the heat insulating layer is not introduced as a unit, but first, the heat insulating layer 20 which is the outermost layer is first introduced. The heat insulating layer 20 can be introduced by using a general method such as normal pull-in or reverse introduction. And after the introduction process of this heat insulation layer 20, this heat insulation layer 20 is made into the state which expanded the diameter as needed, and the basic composition part 18 is reversely introduced into the inside. The installation state of the pipe rehabilitation material 10 provided with the heat insulating layer 20 obtained by this installation operation as the outermost layer is the same as that obtained by the operation shown in FIG. 3, and the operation thereof is also the same as that described above.

  The present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made within the scope of the paper of the invention. For example, the material for configuring the heat insulating layer 20 is not limited to the exemplified material, and various materials having lower thermal conductivity than the basic component 18 can be selected.

  Moreover, it is also possible to make the heat insulation layer 20 elastic to some extent. In that case, in addition to improving the quality of the pipe rehabilitation material by the heat insulation action, it is possible to improve the vibration resistance. That is, vibration transmitted from the existing pipe side can be mitigated by the elasticity of the heat insulating layer 20.

  In the above embodiment, an example in which a coating film is provided on the inner and outer circumferences of the basic component 18 is shown. However, this film is not always required, and the present invention provides a coating film. The same applies to pipe rehabilitation materials that cannot be used.

DESCRIPTION OF SYMBOLS 10 Pipe rehabilitation material 12 Impregnation resin layer 14 Inner periphery coating film 16 Outer periphery coating film 18 Basic component 20 Thermal insulation layer 100 Sewer main

Claims (5)

In the tubular pipe rehabilitation material that is repaired by forming a rehabilitation pipe in the existing pipe after being introduced into the existing pipe to be repaired,
The pipe rehabilitation material has an impregnated resin layer, and an inner peripheral coating film and an outer peripheral coating film on the inner and outer peripheral surfaces of the impregnated resin layer,
As the outermost layer member, a heat insulating layer having a lower thermal conductivity than other constituent members of the pipe rehabilitation material is provided,
The heat insulating layer is composed of an intermediate layer formed of nylon and a layer formed of polyethylene formed inside and outside the intermediate layer. In the tubular pipe rehabilitation material that is repaired by forming a rehabilitation pipe in the existing pipe after being introduced into the existing pipe to be repaired,
As the outermost layer member, a heat insulating layer having a lower thermal conductivity than other constituent members of the pipe rehabilitation material is provided,
The heat-insulating layer is formed by sticking stable inorganic fine particles to either or both of the inner surface and the outer surface. A tubular pipe rehabilitation material that is repaired by forming a rehabilitated pipe in the existing pipe after being introduced into the existing pipe to be repaired, the impregnated resin layer, and the impregnated resin layer The inner and outer peripheral surfaces have an inner peripheral coating film and an outer peripheral coating film, and as the outermost layer member, a heat insulating layer having a lower thermal conductivity than other constituent members of the pipe rehabilitation material is provided, A pipe that draws and introduces a pipe rehabilitation material composed of an intermediate layer formed of nylon and a layer formed of polyethylene formed inside and outside the intermediate layer into one of the existing pipes. Rehabilitation material introduction process,
A diameter expanding step of expanding the diameter of the introduced pipe rehabilitation material with a heat insulating layer in the existing pipe;
A tube rehabilitation material curing step for curing the expanded diameter heat-recovered tube rehabilitation material;
An existing pipe rehabilitation method characterized by including A tubular pipe rehabilitation material that is repaired by forming a rehabilitated pipe in the existing pipe after being introduced into the existing pipe to be repaired, the impregnated resin layer, and the impregnated resin layer The inner and outer peripheral surfaces have an inner peripheral coating film and an outer peripheral coating film, and as the innermost layer member, a heat insulating layer having a lower thermal conductivity than the other constituent members of the pipe rehabilitation material is provided. A pipe rehabilitation material introducing step of introducing a pipe rehabilitation material composed of an intermediate layer formed of nylon and a layer formed of polyethylene formed inside and outside the intermediate layer into the existing pipe;
A diameter expansion step of expanding the diameter of the reintroduced pipe rehabilitation material in the existing pipe,
A tube rehabilitation material curing step for curing the expanded diameter heat-recovered tube rehabilitation material;
An existing pipe rehabilitation method characterized by including A tubular pipe rehabilitation material that is cured after being introduced into an existing pipe to be repaired to form a rehabilitation pipe within the existing pipe, and has an impregnation resin layer and inner and outer peripheral surfaces of the impregnation resin layer. As a step before introducing the pipe rehabilitation material having the coating film and the outer peripheral coating film into the existing pipe,
An intermediate layer that has an outer diameter that can be in close contact with the inner surface of the existing pipe when the diameter is expanded, has a lower thermal conductivity than the constituent material of the pipe rehabilitation material, and is formed of nylon. Conducting a heat insulating cylindrical body introduction step of introducing a heat insulating cylindrical body composed of a layer formed of polyethylene formed outside into an existing pipe,
After the heat insulating cylindrical body introducing step, the pipe rehabilitation material is drawn into the heat insulating cylindrical body or inverted,
Expand the diameter of the tubular rehabilitation material and the heat insulating cylindrical body existing outside thereof,
Thereafter, the existing pipe rehabilitation method is cured.

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