JP2008254367A - Pipe conduit reclamation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe conduit reclamation method enabling not only reinforcement of old water-and-sewage pipes or gas conduits mainly buried in the ground but also correction of the deformation of existing pipe conduits. <P>SOLUTION: The pipe conduit reclamation method includes the processes of: setting a pipe conduit-correcting apparatus 2 having an expansive function for expanding an abutting portion 3 in a radial direction R of a liner 1 for pipe conduit reclamation therein in the deformed portion of an existing pipe conduit 130; heating and pressurizing the deformed portion from the inside of the liner 1; correcting the deformation of the conduit 130 from the inside of the liner 1 by expanding the abutting portion 3 of the pipe conduit-correcting apparatus 2; and cooling the liner 1 in such a state that the abutting portion 3 of the pipe conduit-correcting apparatus 2 is expanded. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipeline rehabilitation method. More specifically, the present invention relates to a pipeline rehabilitation method for reinforcing existing pipelines such as water and sewage pipes and gas conduits and correcting deformation of the existing pipelines.

  When existing pipes that are buried underground, such as water and sewage pipes and gas pipes, are obsolete, the purpose is to restore existing pipes and extend their life. In order to form the rehabilitating pipe having the above, the inner surface of the existing pipe line is lined by using a pipe rehabilitation liner made of hard thermoplastic resin such as hard polyethylene or hard vinyl chloride resin.

  Here, since the existing pipe is usually configured by connecting a plurality of pipes with joints, a step occurs in the joints of the pipes when subjected to an external force due to an earthquake or ground subsidence. There is. In this way, when a step is generated in the joint portion of the pipe line, a large resistance is caused when a fluid such as water and sewage or gas flows, or foreign matter stays in the step portion. By lining the inner surface of such an existing pipeline with a liner for pipeline rehabilitation, the resistance to the flow at the stepped portion is reduced compared to the case where it is not lined, and foreign matter retention is also reduced, There is a problem that the cross-sectional area of the pipe line is locally reduced in the lined stepped portion, and the flow of fluid may not be smoothly performed in the stepped portion. As a technique for solving this problem, for example, there is a technique disclosed in Patent Document 1 as follows.

  Conventionally, a technique relating to a deformation correction device that corrects deformation of a lining pipe lined in an existing pipeline has been disclosed (for example, see Patent Document 1). The deformation correction device described in Patent Document 1 includes a pressing plate having a shape substantially along the shape of a part of the inner surface of an existing pipeline, and advancing / retreating means for moving the pressing plate forward and backward toward the inner surface of the existing pipeline. A configuration in which the pressing plate is advanced toward the deforming portion by the advancing / retreating means and the pressing plate is pressed against the deforming portion with the pressing plate facing the deforming portion of the lining pipe lined in the existing pipeline. It has become. By using this deformation correction device, it is said that the deformed portion of the lining pipe can be corrected to ensure a good space in the pipe line.

JP 2000-240850 A

  However, the technique relating to the deformation correction device described in Patent Document 1 is that the inner pipe of the existing pipe is connected to the inner pipe so as to eliminate a gap formed between the inner pipe lined in the existing pipe and the existing pipe. It is intended to adhere to. However, since there is a level difference in the joint part of the existing pipe in the first place, no matter how much the tightness of the lining pipe is increased, it will not be possible to re-form the linear flow path before the existing pipe is deformed. Absent.

  In addition, the existing pipelines that have become obsolete due to external forces due to the load of earth and sand above the existing pipelines buried in the ground may have an elliptical cross section. In this case, as in the case where a step is generated in the joint portion of the existing pipeline, the resistance to the fluid flow may increase and the fluid transport capability may decrease. Further, merely lining a liner along the inner wall of the existing pipe line whose cross section is flattened in an elliptical shape does not serve as a countermeasure against the decrease in the transportation capacity due to the elliptical cross section.

  The present invention has been made in view of the above circumstances, and the purpose thereof is to reinforce existing pipelines that have been buried mainly in the ground such as water and sewage pipes and gas conduits and to deform existing pipelines. It is to provide a pipeline rehabilitation method that can be corrected.

Means and effects for solving the problems

  The pipeline rehabilitation method according to the present invention reinforces an existing pipeline mainly by lining the inner surface of an existing pipeline buried in a sewer pipe or the like, and can also correct the deformation of the existing pipeline. It relates to the rehabilitation method. And the pipe line rehabilitation method according to the present invention has the following features in order to achieve the above object. That is, the pipe line rehabilitation method of the present invention includes the following features alone or in combination as appropriate. In addition, the pipe line rehabilitation method according to the present invention can be applied to an existing pipe line other than the sewer pipe line.

  In order to achieve the above object, the first feature of the pipe rehabilitation method according to the present invention is a pipe rehabilitation comprising a tubular woven fabric in which a hard thermoplastic resin layer is formed on at least one of an inner surface and an outer surface. A lining process for lining the liner for the inner surface of the existing pipe line, and an expansion in the deformed part of the existing pipe line to extend the contact part in the radial direction of the pipe line rehabilitation liner inside the pipe line rehabilitation liner A correction device installation step of installing a pipeline correction device having a function, and a heating and pressurization step of heating and pressurizing the liner for rehabilitation around the deformed portion from the inside of the liner for rehabilitation of the pipeline, After the heating and pressing step is performed, the existing pipe line is deformed from the inside of the pipe line rehabilitation liner by expanding the contact part of the pipe line correcting device installed in the deformation part. A positive correcting process is that it is provided with a cooling step of cooling the pipe rehabilitation liner while said contact portion is expanded in the conduit straightening device.

  According to this configuration, the pipeline rehabilitation liner is heated while being pressed against the inner wall of the existing pipeline by the heating and pressurizing step. Thereby, the liner for pipeline rehabilitation comes to have flexibility while maintaining a state in close contact with the existing pipeline. And the deformation | transformation of the existing pipe line is corrected via the liner for pipe rehabilitation by correcting the deformation | transformation of the existing pipe line from the inner side of the liner for pipe rehabilitation provided with the flexibility by the said correction process. At this time, since flexibility is imparted to the pipeline rehabilitation liner, it is possible to prevent damage such as breakage of the pipeline rehabilitation liner. Furthermore, since the liner for pipe rehabilitation is a liner made of a tubular woven fabric, it can withstand the straightening force that acts on the pipe rehabilitation liner from the pipe straightening device during the straightening process.

  And by the said cooling process, the liner for pipeline renovation is cooled, restraining the force which returns the existing pipeline to the original deformed state. And the force which tries to return an existing pipe line to the original deformed state is restrained because the liner for pipe rehabilitation hardens. Therefore, with the main pipe rehabilitation method, the inner surface of the existing pipe line is lined with a pipe line rehabilitation liner made of a tubular woven fabric to reinforce the existing pipe line, and the deformation of the existing pipe line is also effectively corrected. be able to. Therefore, the existing pipe line returns to a shape close to the initial laid state, the fluid transport capability is sufficiently ensured, and the function of the pipe line can be maintained well.

  The second feature of the pipeline rehabilitation method according to the present invention is that the pipeline straightening device has a heating and cooling device, and the heating and pressurizing step and the cooling step are performed using the pipeline straightening device. Is to be done.

  According to this configuration, heating and pressurization of the pipe rehabilitation liner in the heating and pressurizing step can be performed using the pipe straightening device. In addition, cooling of the pipeline rehabilitation liner in the cooling step can also be performed using a pipeline correction device. Therefore, it is not necessary to provide a separate means to supply a pressurized fluid for heating and pressurizing the pipeline rehabilitation liner or to supply a cooling fluid for cooling the pipeline rehabilitation liner, thereby shortening the construction period. This is possible and also reduces the equipment cost.

  Moreover, the 3rd characteristic in the pipe line renovation method which concerns on this invention is that the said existing pipe line is comprised with the vinyl chloride pipe | tube.

  According to this configuration, the vinyl chloride resin is a thermoplastic resin that softens when heat is applied. Therefore, by heating and pressurizing the liner for line rehabilitation lined on the existing pipeline made of vinyl chloride pipe, The existing pipeline is also heated to some extent through the rehabilitation liner, and it is easy to correct the deformation of the existing pipeline. In addition, PVC pipes are easier to break than metal pipes, but the existing pipes are straightened while the pipe rehabilitation liner made of a cylindrical woven fabric is heated and brought into close contact with it, preventing damage to the existing pipes. Is done.

   The fourth feature of the pipeline rehabilitation method according to the present invention is that the existing pipeline is composed of a main pipe and a branch pipe branched from the main pipe, and the deforming portion exists in the branch pipe. It is that you are.

  According to this configuration, it is possible to easily correct, for example, the deformation of the branch pipe that an operator cannot enter using the pipe straightening device.

  Further, a fifth feature of the pipe rehabilitation method according to the present invention is that the abutting portion of the pipe straightening device is arranged so that the straightening step does not expand the existing pipe larger than the inner diameter before deformation. In other words, the deformation portion is expanded through the abutting portion while restricting the movement.

  According to this configuration, the movement of the contact portion of the pipe straightening device is limited so as not to expand larger than the inner diameter of the existing pipe before deformation. Thereby, the deformation | transformation of an existing pipe line can be corrected without imposing an excessive burden with respect to the existing pipe line, and the damage of an existing pipe line can be prevented.

  Further, a sixth feature of the pipeline retreading method according to the present invention is that the heating and pressurizing step is performed under an internal pressure of the pipeline retreading liner of 0.05 to 0.2 MPa, and the correcting step. Is to expand the deforming portion through the contact portion with a pressure of 1 to 20 MPa.

  According to this configuration, by performing the heating and pressurizing step at a pressure of 0.05 to 0.2 MPa, it is possible to appropriately perform the above heating and pressing step without causing an excessive pressure to act on the liner for pipe rehabilitation. . In addition, the facilities required for heating and pressurizing the pipeline rehabilitation liner can be minimized in terms of space and cost. Moreover, the deformation | transformation of the existing pipe line can be reliably corrected by performing a correction process with the pressure of 1-20 Mpa.

  Moreover, the 7th characteristic in the pipe line renovation method which concerns on this invention is that the said deformation | transformation part is the level | step difference which arose in the joint part of the said existing existing pipe line.

  According to this configuration, the existing pipelines connected to each other at the joint are returned to a straight line. As a result, it is possible to improve the reduction of the fluid transport capacity due to the reduction of the cross-sectional area of the flow path due to the step generated in the joint part of the existing pipe line, the increase in resistance to the flow of the fluid, or the retention of foreign matter in the step part. it can.

Moreover, the 8th characteristic in the pipe line renovation method which concerns on this invention is that the said deformation | transformation part is the cross section flattened in the elliptical shape of the said existing pipe line.

  According to this configuration, the cross-section of the existing pipeline is returned to a circular shape. Thereby, the fall of the flow velocity of the fluid resulting from the increase in flow-path resistance by having flow-path cross-section flattened in elliptical shape can be improved.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In addition, here, the conventional problem in the rehabilitation of the existing pipe line will be described first, and then the embodiment of the pipe line rehabilitation method according to the present invention will be described.

  In the description of the embodiment of the pipeline rehabilitation method according to the present invention, the branch pipe branched from the main pipe of the sewer pipe that cannot be entered by the worker is selected as the target of the existing pipe to be rehabilitated. However, the present invention is not limited to this, and the pipeline rehabilitation method according to the present invention can also be applied to a main pipe of a sewer pipe or other existing pipe.

  First, conventional problems in rehabilitation of existing pipelines will be described. FIG. 1 is a schematic view showing an existing sewer pipe 100 having a step and a state in which the sewer pipe 100 is lined. FIG. 2 is a schematic view showing an existing sewer pipe 100 having an elliptical cross section and a state in which the sewer pipe 100 is lined.

  In general, a synthetic resin pipe such as a vinyl chloride pipe, a ceramic pipe, and a reinforced concrete pipe are used as the sewer pipe 100 (a main pipe and a branch pipe branched from the main pipe). Here, as shown to Fig.1 (a), the joint part 107 of the sewer pipe 100 is another pipe (sewer pipe 100) of the concave shape edge part of one pipe (sewer pipe 100). In many cases, a convex end is inserted, and when the sewage pipe 100 is laid down poorly, the ground is soft, or the sewer pipe 100 is aged, the concave end A part may be damaged and a level | step difference may arise in the joint part 107 of the sewer pipe 100. FIG. In this case, due to the resistance at the stepped portion, the flow capacity is reduced, such as a decrease in the flow velocity of the fluid in the pipe and a reduction in the flow cross section. Moreover, a solid substance may stay in a step part.

  When such a sewer pipe 100 is lined, as shown in FIG. 1 (b), the inner surface of the liner 1 for line rehabilitation after lining is in a state in which the level difference is transferred as it is, and drastic flow is drastically improved. There has not been any improvement.

  Further, as shown in FIG. 2 (a), the sewerage pipe 100 that has deteriorated due to external force due to the load of earth and sand above the sewerage pipe 100 buried in the ground has a cross section in the direction in which the fluid flows. It may be flattened in an elliptical shape. In this case, as in the case where a step is generated in the joint portion 107 of the sewer pipe 100, the fluid flow resistance may increase and the fluid flow capability may decrease. Moreover, as shown in FIG.2 (b), only by lining a liner along the inner wall of the sewer pipe line 100 whose cross section was flattened elliptically, with respect to the fall of the flow ability resulting from a cross section being elliptical. This is not a drastic measure.

  Conventionally, as a drastic measure against these deformations of the sewer pipe 100, a sheath pipe construction method or a replacement to a new pipe by a propulsion construction method has been performed. However, all of these measures are uneconomical.

  Next, an embodiment of the pipe line rehabilitation method according to the present invention will be described. Here, first, an embodiment of a pipeline rehabilitation liner used in the pipeline rehabilitation method of the present invention will be described. FIG. 3 is a schematic view showing an embodiment of a pipeline rehabilitation liner according to the pipeline rehabilitation method of the present invention.

  As shown in FIG. 3, the liner 1 for pipe rehabilitation according to the present embodiment has an inner surface hard thermoplastic resin layer 14 formed on the inner surface of a tubular woven fabric 11 and an outer surface hard thermoplastic resin layer 15 formed on the outer surface. It is. Here, the tubular woven fabric 11 is a seamless tubular woven fabric composed of wefts 13 continuously woven in a spiral shape with respect to the warp yarn 12. For this reason, the cylindrical woven fabric 11 has a high breaking stress. Therefore, even if it presses strongly in the diameter direction of the liner 1 for pipe rehabilitation from the inside of the liner 1 for pipe rehabilitation using the pipe straightening device mentioned later, the liner 1 for pipe rehabilitation does not break. In addition, when this cylindrical woven fabric 11 is pressurized from the inside, the weft 13 is pulled and extended in the circumferential direction and the bent portion approaches a straight line. Expand.

  Here, in the present embodiment, 1120 tex / 4 × 604 yarns made of polyethylene terephthalate (PET) are used as the warp yarns 12 of the tubular woven fabric 11, and 1100 tex / made of polyethylene terephthalate (PET) is used as the weft yarns 13. A bulky processed yarn of 3 × 45 pieces / 10 cm was used. This polyethylene terephthalate is a very heat-resistant resin, and has a strength of about 80% of the strength at room temperature even when heated to about 80 ° C. And the thickness of the cylindrical woven fabric 11 was about 0.3 mm in the state embedded in the hard thermoplastic resin layer.

  Moreover, the hard thermoplastic resin of this embodiment which forms the inner surface hard thermoplastic resin layer 14 and the outer surface hard thermoplastic resin layer 15 is 100 parts of hard vinyl chloride resin, 3.5 parts of MBS, and 3 parts of stabilizer by weight ratio. A hard vinyl chloride resin with 5 parts of plasticizer was used. And the thickness of the inner surface hard thermoplastic resin layer 14 is about 6 mm, and the thickness of the outer surface hard thermoplastic resin layer 15 is about 1 mm. The inner surface hard thermoplastic resin layer 14 is a layer that forms the inner surface of the pipeline rehabilitation liner 1 and is set to be thicker than the outer surface because it is directly heated, pressurized, and pressed.

  Moreover, since the tubular woven fabric 11 can be expanded in the radial direction, the liner 1 for pipe rehabilitation composed of the hard thermoplastic resin layers (14, 15) and the tubular woven fabric 11 is softened and expanded by heating. It can expand larger than the inner diameter of the existing pipeline. Therefore, the adhesion between the pipeline rehabilitation liner 1 and the existing pipeline is very high. In addition, even if the existing pipe line is aged and has a stepped part at the pipe connection point or a discontinuous pipe breakage part, it can be expanded larger than the inner diameter of the existing pipe line, and it has flexibility by heating. Further, the liner for pipe rehabilitation 1 can be in close contact with the stepped portion or the bent portion of the pipe along almost no gap, and the stepped portion or the bent portion of the pipe is less likely to be wrinkled. Moreover, even if the deformation of the existing pipe line is corrected from the inside of the pipe line rehabilitation liner 1 using a pipe line straightening device to be described later, the flexible pipe line rehabilitation liner 1 can be used to correct the existing pipe line. It is easy to follow the deformation in the applied direction, and there is almost no cracking or breaking.

  Next, an embodiment of the pipe line rehabilitation method according to the present invention using the pipe line rehabilitation liner 1 will be described. A branch pipe 130 extending from a sewage tank or a rainwater tank connected to a ditch of a house or a road is generally attached to the main pipe of the sewer pipe. As described above, in the description of the present embodiment, the branch pipe 130 branched from the main pipe of the sewer pipe is selected as the target of the existing pipe to be rehabilitated. The diameter of the branch pipe 130 is generally about 65 mm to 150 mm in many cases.

  FIG. 4 is a schematic view showing a state in which the pipe straightening device 2 according to the pipe rehabilitation method of the present invention is installed in an existing branch pipe 130 in which a step is generated. As shown in FIG. 4, a step is generated in the joint portion 130 of the adjacent branch pipe 130.

  Before the pipe straightening device 2 is installed in the branch pipe 130 that is one of the existing pipes, a lining process (not shown) is performed in which the inner surface of the branch pipe 130 is lined with the pipe rehabilitation liner 1. First, the lining process will be described.

  The lining process is usually a process including a heating process, a liner insertion process, an expansion process, a cooling process, and an edge processing process. In the lining process, first, a heating process is performed in which the pipeline rehabilitation liner 1 carried into the site is made flexible by heating with steam of about 100 ° C. supplied from a boiler or the like. In addition, since the liner 1 for pipe rehabilitation in this embodiment has a softness | flexibility if it heats to about 80 to about 100 degreeC, the temperature to heat is not restricted to about 100 degreeC.

  Next, the pipeline rehabilitation liner 1 that is heated with a cross-sectional shape in which the cross-sectional area of the cross-section perpendicular to the longitudinal direction of the pipe rehabilitation liner 1 is reduced as compared with the case where the cross-section is circular is inserted into the branch pipe 130. The liner insertion process is performed. The cross-sectional shape obtained by reducing the cross-sectional area of the cross section orthogonal to the longitudinal direction as compared with the case where the cross section is circular is, for example, a cross-sectional shape orthogonal to the longitudinal direction is a flat, V-shaped, or U-shaped shape Thus, the pipeline rehabilitation liner 1 can be easily inserted into the branch pipe 130.

  And the expansion process which expands the liner 1 for pipeline regeneration by heating and pressurizing the liner 1 for pipeline regeneration from the inner side of the liner 1 for pipeline regeneration inserted in the branch pipe 130 is performed. The heating and pressurization of the pipeline rehabilitation liner 1 are performed by, for example, pressurized steam supplied from a boiler or the like. Thereby, the liner 1 for pipe rehabilitation whose cross-sectional area perpendicular to the longitudinal direction is reduced as compared with the case of the cylindrical body swells in a cylindrical shape and adheres closely to the inner surface of the branch pipe 130.

  Thereafter, the operation of the boiler is stopped, and for example, a cooling process is performed in which compressed air is supplied from the air compressor into the pipeline rehabilitation liner 1 to cool the pipeline rehabilitation liner 1 while maintaining a pressurized state. In addition, water may be used to cool the pipeline rehabilitation liner 1 quickly. When the pipe rehabilitation liner 1 is cooled and hardened, the air compressor is stopped and the pressure in the pipe rehabilitation liner 1 is released so that the end of the pipe rehabilitation liner 1 becomes the end of the branch pipe 130. The edge part process process cut | disconnected together is performed. Thereby, a lining process is complete | finished and the space which can insert the pipeline correction apparatus 2 shown in FIG. 4 in the liner 1 for pipeline regeneration is ensured.

  Next, the correction apparatus installation process which installs the pipe straightening apparatus 2 shown in FIG. 4 is performed. As shown in FIG. 4, the straightening device installation process is for pipe rehabilitation in a joint 107 where a step which is a deformed part of the branch pipe 130 is generated via the pipe rehabilitation liner 1 lined to the branch pipe 130. This is a step of installing the pipe straightening device 2 having an expansion function for expanding the contact portion 3 in the radial direction R of the liner 1.

 Here, the pipe straightening device 2 includes a straightening packer 7 having a contact portion 3, a heating / cooling device 5 provided in the straightening packer 7, and a supply path 6 for supplying pressurized steam to the heating / cooling device 5. The rod 4 for arranging the correction packer 7 at an arbitrary position of the branch pipe 130 is provided. The correction packer 7 has an expansion function for expanding the contact portion 3 in the radial direction R by water pressure or hydraulic pressure. Moreover, the contact part 3 consists of a rubber material reinforced with, for example, a steel wire. In addition, the contact portions 3 are provided on both sides in one direction orthogonal to the axial direction of the correction packer 7 (see FIG. 6). Further, the abutting portion 3 has a curved cross-sectional shape so as to make surface contact with the inner wall of the branch pipe 130. The contact portion 3 may be provided over the entire circumference of the correction packer 7.

  Further, the pipe straightening device may include an expansion function that mechanically expands the contact portion in the radial direction R by a hydraulic drive device or an electric drive device via a link mechanism, for example. As a result, the deformed portion is expanded via the abutting portion by restricting the abutting portion of the pipe straightening device by stroke control or the like so that the branch pipe 130 is not expanded larger than the inner diameter before deformation. can do. The stroke control may limit the movement of the contact portion by using a limit switch or the like so that the contact portion does not expand larger than the inner diameter of the branch pipe 130 (existing pipe line) before deformation. However, the link mechanism may be provided with a member having a dimension that does not expand larger than the inner diameter of the branch pipe 130 before deformation. According to this configuration, the deformation of the branch pipe 130 can be corrected without imposing an excessive burden on the branch pipe 130, and damage to the branch pipe 130 can be prevented.

  The heating / cooling device 5 injects pressurized steam supplied from the supply path 6 toward the inner surface of the pipeline rehabilitation liner 1, and when cooling the pipeline rehabilitation liner 1, air or water is supplied to the pipeline. An injection device including a nozzle for injecting toward the inner surface of the rehabilitation liner 1 is provided. In addition, it is not always necessary to provide the heating / cooling device 5 and the supply path 6 for supplying the pressurized steam to the pipe straightening device 2. For example, the pressurized steam for heating and pressurizing the pipeline rehabilitation liner 1 separately. A route such as a hose that supplies the compressed air for cooling the pipe rehabilitation liner 1 may be provided.

  Next, a heating and pressurizing step of heating and pressurizing the pipe rehabilitation liner 1 from the inside of the pipe rehabilitation liner 1 lined to the branch pipe 130 is performed. In this heating and pressurizing step, pressurized steam is supplied from the heating and cooling device 5 of the pipe straightening device 2 toward the inner surface of the pipe rehabilitation liner 1. By this pressurized water vapor, the pipeline rehabilitation liner 1 is heated and pressurized and has flexibility while maintaining a state of being in close contact with the branch pipe 130. In addition, it is preferable that a heating-pressing process is performed with the pressurized water vapor | steam of the pressure of 0.05-0.2 MPa. More preferably, it is performed with pressurized steam at a pressure of 0.05 to 0.1 MPa. Thus, the heating and pressurizing step can be appropriately performed without causing excessive pressure to act on the pipeline rehabilitation liner 1 and sufficiently softening the pipeline rehabilitation liner 1. Moreover, the facilities required for heating and pressurizing the pipeline rehabilitation liner 1 can be suppressed to the minimum necessary in terms of space and cost.

  Next, a correction process is performed to correct the deformation of the branch pipe 130 (a step generated in the joint portion 107). FIG. 5 is a schematic view showing a state in which the deformation of the branch pipe 130 shown in FIG. 4 is corrected.

  As shown in FIG. 5, after the heating and pressurizing step is performed, the pipe straightening device 2 installed in the joint portion 107 in which a step which is a deformed portion of the branch pipe 130 is generated via the pipe rehabilitation liner 1. The abutting portion 3 is expanded in the radial direction R of the pipeline rehabilitation liner 1, whereby a correction process for correcting the deformation of the branch pipe 130 from the inside of the pipeline rehabilitation liner 1 is performed.

  At this time, since the pipeline rehabilitation liner 1 is heated by the pressurized steam by the pipeline rehabilitation liner 1, flexibility is given to the pipeline rehabilitation liner 1. It is prevented from being damaged such as cracking. Furthermore, since the liner 1 for pipe rehabilitation is a liner made of a tubular woven fabric 11, it can withstand the straightening force that acts on the pipe rehabilitation liner 1 from the pipe straightening device 2 during the straightening process. it can. In addition, it is preferable that this correction process is performed with the pressure (pressing force of the pipe line correction apparatus 2) of 1-20 Mpa. Thereby, the level | step difference produced in the joint part 107 of the branch pipe 130 can be correct | amended reliably. When the branch pipe (existing pipe line) to be corrected is a synthetic resin pipe such as a vinyl chloride pipe, the correction process can be performed with a pressure of about 1 to 3 MPa (pressing force of the pipe straightening device 2). The level | step difference which arose in the joint part 107 of the branch pipe 130 can be corrected with the pressure which suppressed the burden with respect to the liner 1 for pipe rehabilitation.

  Next, a cooling step is performed in which the pipeline rehabilitation liner 1 is cooled while the contact portion 3 of the pipeline correction device 2 is expanded. In this cooling step, compressed air for cooling the pipeline rehabilitation liner 1 is supplied from the heating / cooling device 5 of the pipe straightening device 2 toward the inner surface of the pipe rehabilitation liner 1. Note that water may be used without using compressed air. As a result, the pipeline rehabilitation liner 1 is cooled while the pipeline straightening device 2 supports the force that causes the branch pipe 130 to return to the original level difference. And the force which tries to return the branch pipe 130 to the state which the original level | step difference produced when the liner 1 for pipe rehabilitation hardens | cures is supported by the liner 1 for pipe rehabilitation.

  As described above, the inner surface of the branch pipe 130 is lined with the pipe rehabilitation liner 1 made of the tubular woven fabric 11 to reinforce the branch pipe 130 and to branch the branch pipe 130 by the pipe rehabilitation method of the present embodiment. The deformation can be effectively corrected. Therefore, the branch pipe 130 returns to the laid straight initial shape, the fluid flow ability is sufficiently secured, and the function of the pipe line can be maintained well.

  In addition, the pipe rehabilitation method of the present invention is smaller in equipment than conventional techniques such as a sheath pipe method and replacement with a new pipe by a propulsion method, so it is easy to secure a construction site and is economical. It is also a practical method.

  The branch pipe 130 can be all of synthetic resin pipes such as vinyl chloride pipes, ceramic pipes, reinforced concrete pipes, and the like. It is preferable to apply the rehabilitation method.

  Since the vinyl chloride resin is a thermoplastic resin that softens when heat is applied, the pipeline rehabilitation liner 1 is heated and pressurized by heating and pressurizing the pipeline rehabilitation liner 1 lined to the branch pipe 130 made of a vinyl chloride pipe. The branch pipe 130 is also heated to some extent via the, so that the deformation of the branch pipe 130 is easily corrected. In addition, the vinyl chloride pipe is easier to break than the metal pipe, but the branch pipe 130 is corrected while the pipe rehabilitation liner 1 made of the cylindrical woven fabric 11 is heated and brought into close contact with the pipe. Is also prevented.

  In addition, when the branch pipe 130 is a vinyl chloride pipe, if the straightening process is performed with the vinyl chloride pipe alone without performing the lining process in the pipe line rehabilitation method of the present invention, only the portion where the vinyl chloride pipe is easily stretched is partially obtained. However, the branch pipe 130 is not easily corrected. That is, by lining the pipe rehabilitation liner 1 having a high breaking stress due to the tubular woven fabric 11 on the inner surface of the branch pipe 130, it is possible to prevent the branch pipe 130 from being broken or excessively stretched.

  Next, the pipe rehabilitation method according to the present invention can also be applied to correct an elliptical cross section of an existing pipe to a circle. FIG. 6 is a schematic view showing a branch pipe 130 whose section is flattened in an elliptical shape and a state in which the deformation of the branch pipe 130 is corrected. The description of the same members as those in the above embodiment is omitted.

  As shown in FIG. 6A, the pipe straightening device 2 is installed inside the branch pipe 130 through the pipe rehabilitation liner 1 lined on the inner wall surface of the branch pipe 130 whose section is flattened in an elliptical shape. (Correction device installation process).

  Then, after the heating and pressurizing step is performed, the abutment portion 3 of the conduit straightening device 2 installed inside the elliptically flattened branch pipe 130 which is a deformed portion is expanded, thereby the pipeline rehabilitation liner. A straightening process is performed to correct the deformation of the branch pipe 130 from the inside of the pipe 1 into a circular shape, and then the cooling for cooling the pipe rehabilitation liner 1 with the abutting portion 3 of the pipe straightening device 2 expanded. A process is performed.

  Thereby, the flow path cross section of the branch pipe 130 is returned to the circular shape, and the decrease in the fluid flow rate due to the increase in the flow path resistance due to the flat flow path cross section is improved.

  FIG. 7 is a schematic view showing an existing branch pipe 130 in which a pipe breakage has occurred and a state in which the deformation of the branch pipe 130 is corrected.

  As shown in FIG. 7, for example, the pipe rehabilitation method according to the present invention is applied to an existing branch pipe 130 in which a concave end portion is damaged and a pipe break occurs in the joint portion 107 of the branch pipe 130. can do.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

It is the schematic which shows the state which lined the existing sewer pipe line in which the level | step difference produced, and this sewer pipe line. It is the schematic which shows the state which lined the existing sewer pipe line in which the cross section was flattened in the ellipse shape, and this sewer pipe line. It is the schematic which shows one Embodiment of the liner for pipe rehabilitation which concerns on the pipe rehabilitation method of this invention. It is the schematic which shows the state which installed the pipe straightening apparatus which concerns on the pipe line renovation method of this invention in the branch pipe which the level | step difference branched from the main pipe of the existing sewer pipe line produced. It is the schematic which shows the state which corrected the deformation | transformation of the branch pipe shown in FIG. It is the schematic which shows the state which corrected the deformation | transformation of the branch pipe whose cross section was flattened elliptically, and this branch pipe. It is the schematic which shows the state which corrected the deformation | transformation of the existing branch pipe in which the pipe breakage produced, and this branch pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipeline rehabilitation liner 2 Pipe straightening device 3 Contact part 11 Cylindrical woven fabric 12 Warp 13 Weft 14 Inner surface hard thermoplastic resin layer 15 Outer surface hard thermoplastic resin layer 100 Sewer pipe (existing pipe line)
130 Branch pipe (existing pipeline)

Claims (8)

A lining step of lining a liner for pipe rehabilitation made of a tubular woven fabric in which a hard thermoplastic resin layer is formed on at least one of the inner face and the outer face on the inner face of an existing pipe;
A straightening device installation step of installing a pipe straightening device having an expansion function for expanding a contact portion in the radial direction of the pipe rehabilitation liner inside the pipe rehabilitation liner in the deformed part of the existing pipe line; ,
A heating and pressurizing step of heating and pressurizing the liner for line rehabilitation around the deformed portion from the inside of the lined liner for line rehabilitation;
After the heating and pressurizing step is performed, the deformation of the existing pipe line is corrected from the inside of the pipe line rehabilitation liner by expanding the contact part of the pipe line correction device installed in the deformation part. Straightening process,
And a cooling step for cooling the pipeline rehabilitation liner while expanding the contact portion of the pipeline straightening device. The pipe straightening device has a heating / cooling device,
The conduit rehabilitation method according to claim 1, wherein the heating and pressurizing step and the cooling step are performed using the conduit straightening device.   The pipeline rehabilitation method according to claim 1 or 2, wherein the existing pipeline is made of a vinyl chloride pipe.   The said existing pipe line is comprised with the branch pipe branched from the main pipe and the main pipe, The said deformation | transformation part exists in the said branch pipe, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The pipeline rehabilitation method described in item 1.   In the correction step, the deformation is performed via the abutting portion while restricting the abutting portion of the pipe straightening device so that the existing pipeline is not expanded larger than the inner diameter before deformation. The pipe rehabilitation method according to any one of claims 1 to 4, wherein the section is expanded.   The heating and pressurizing step is performed under an inner pressure of the pipeline rehabilitation liner of 0.05 to 0.2 MPa, and the correcting step is performed through the contact portion with a pressure of 1 to 20 MPa. The pipe rehabilitation method according to any one of claims 1 to 5, wherein the portion is expanded.   The pipe line rehabilitation method according to any one of claims 1 to 6, wherein the deforming part is a step generated in a joint part of the adjacent existing pipe line.   The pipe rehabilitation method according to any one of claims 1 to 7, wherein the deforming portion has an elliptical cross section of the existing pipe line.

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