JP2017020525A - Construction method for regeneration pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce residual stress generated at a regeneration pipe in its axial direction in a construction method for regeneration pipe.SOLUTION: This invention relates to a construction method for a regeneration pipe comprising an insertion process, a restoration process, a shutdown process, a diameter expansion process and a cooling process. In the insertion process, a regeneration pipe 1 made of thermoplastic resin is inserted into an existing pipe 2 under its non-cylindrical state. In the closing process, both ends of the regeneration pipe 1 are closed under a state in which an extremity end pit 25 of an injection hose 5 is inserted into the regeneration pipe 1 by a pair of sealing jigs 3, 4 including a first jig 3 formed with an open hole 23b where the injection hose 5 is tightly sealed. In the diameter expansion process, the diameter is expanded by pressuring the regeneration pipe 1. In the cooling process, the regeneration pipe 1 is cooled while keeping a relative temperature difference between a start side and a reaching side by injecting heat medium from the extremity pit 25 of the injection hose 5 within the regeneration pipe 1.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a construction method for a rehabilitated pipe in which the inner surface of an existing pipe is lined with a rehabilitated pipe made of resin.

  Conventionally, a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe is inserted into an existing pipe such as a sewer pipe buried in the ground in a non-cylindrical state, and the inserted rehabilitation pipe An existing pipe rehabilitation method is widely known in which a pipe is heated to be restored to a cylindrical shape and then pressurized to expand the diameter so that the inner surface of the existing pipe is lined with a rehabilitation pipe.

  In such a rehabilitation method, after the rehabilitation pipe is expanded and attached to the inner surface of the existing pipe, the rehabilitation pipe is generally cooled by, for example, air cooling in order to cure the rehabilitation pipe (for example, Patent Documents). 1).

JP-A-11-333934

  By the way, when the heated and pressurized rehabilitation pipe is cooled, the rehabilitation pipe contracts due to linear expansion. In addition, if the rehabilitated pipe that has been cooled and hardened while sticking to the inner surface of the existing pipe attempts to shrink in the axial direction, a frictional resistance is generated between the inner surface of the existing pipe and the outer surface of the rehabilitated pipe. .

  Thus, in the above rehabilitation method, since the heated and pressurized rehabilitation pipe is uniformly air-cooled over its entire length, the rehabilitation pipe is cured while the shrinkage force and the frictional resistance act on the rehabilitation pipe. Therefore, residual stress is generated in the axial direction of the rehabilitated pipe. Such unintentional occurrence of residual stress may cause premature breakage of the rehabilitation pipe.

  This invention is made | formed in view of this point, The place made into the objective is to provide the technique which reduces the residual stress which generate | occur | produces in the axial direction of a rehabilitation pipe in the construction method of a rehabilitation pipe.

  In order to achieve the above object, in the rehabilitating pipe construction method according to the present invention, the rehabilitating pipe is forcedly provided with a relative temperature difference between one axial side and the other axial side of the rehabilitating pipe. It is made to shrink sequentially from one side.

  Specifically, the present invention is directed to a rehabilitation pipe construction method in which the inner surface of an existing pipe is lined with a rehabilitation pipe.

  And this rehabilitation pipe construction method includes an insertion step of inserting the rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into the existing pipe in a non-cylindrical state, A rehabilitation process for restoring the rehabilitation pipe inserted in the pipe to a cylindrical shape and a through-hole through which the injection hose penetrates through both ends of the rehabilitation pipe restored to the cylindrical shape are formed. A closing step in which the tip end portion of the injection hose is inserted in the rehabilitation tube and a rehabilitation tube in which both ends are closed are pressurized from the inside by a pair of sealing jigs including the sealing jig. The diameter expansion step of expanding the diameter of the rehabilitation pipe, and by injecting the heat medium from the tip of the injection hose within the diameter expansion rehabilitation pipe, the relative direction between the one axial side and the other axial side of the rehabilitation pipe A typical temperature difference It is characterized in that comprising a cooling step of cooling the rehabilitating pipe.

  According to this structure, between the axial direction one side and the axial direction other side in a rehabilitation pipe | tube by heat media, such as cooling water and a warm air which are injected from the front-end | tip part of the injection hose previously inserted in the rehabilitation pipe | tube. Since the rehabilitating pipe is cooled while providing a relative temperature difference, the rehabilitating pipe cools from one side in the axial direction, for example. Therefore, the rehabilitation pipe is forcibly shrunk from one side in the axial direction due to the contraction force due to linear expansion, but hardening by cooling has not yet progressed on the other side in the axial direction where the temperature is relatively high. The frictional resistance generated between the outer surface of the rehabilitating pipe and the outer surface of the rehabilitated pipe is smaller than the frictional resistance between the outer surface of the rehabilitating pipe and the inner surface of the existing pipe which is being hardened by cooling. Thus, for example, by reducing the injection amount of the heat medium or lowering the temperature of the heat medium, the relative temperature difference between the one side in the axial direction and the other side in the regenerative pipe is gradually reduced. When the cooling proceeds to the other side in the axial direction of the rehabilitation pipe, the residual stress in the axial direction generated in the rehabilitation pipe can be reduced as compared with the case where the rehabilitation pipe is uniformly air-cooled over its entire length.

  Here, as one aspect of providing a relative temperature difference between the one axial side and the other axial side of the rehabilitated pipe, in the rehabilitating pipe construction method, the heat medium is cooling water, and the cooling step Then, it is preferable to move the tip end portion of the injection hose from one side in the axial direction of the rehabilitation pipe to the other side while jetting cooling water from the tip end portion of the injection hose.

  According to this configuration, starting from one side in the axial direction of the rehabilitation pipe, after injecting the cooling water from the tip of the injection hose for a predetermined time, the injection hose is moved to the other side in the axial direction by a predetermined distance, and at that point By repeating the operation of injecting the time cooling water, the rehabilitation pipe can be cooled from one side in the axial direction.

  As another aspect of providing a relative temperature difference between one axial side and the other axial side of the rehabilitated pipe, in the rehabilitating pipe construction method, the heat medium is hot air, and the cooling step Then, it is preferable to inject hot air from the tip end portion of the injection hose located at the end portion on the other axial side of the rehabilitation pipe while feeding cool air from one axial side of the rehabilitation pipe to the other side in the axial direction. .

  According to this configuration, since the cool air is sent from the one axial side of the rehabilitation pipe to the other side in the axial direction, the rehabilitation pipe cools from the one side in the axial direction. However, if the cool air is simply sent from one side in the axial direction of the rehabilitation pipe, the ends of the one side and the other side of the rehabilitation pipe are cooled and hardened almost simultaneously, and the contraction force due to linear expansion causes the axial direction. It may be difficult to force the rehabilitation tube to be contracted from one side. In this respect, in the present invention, since warm air is injected from the tip of the injection hose located at the end on the other side in the axial direction of the rehabilitation pipe, the rehabilitation is performed while cooling the rehabilitation pipe from one side in the axial direction by cold air. It can suppress that the edge part of the axial direction other side in a pipe | tube cools naturally and hardens | cures. Therefore, the rehabilitation pipe can be forcibly contracted from one side in the axial direction by the contraction force due to the linear expansion, and the residual stress generated in the rehabilitation pipe can be reduced.

  Furthermore, in the construction method of the rehabilitation pipe, the injection hose includes a tip pit capable of injecting cooling water obliquely rearward over the entire circumference and a heat-resistant hose, and adjusts the water pressure of the injected cooling water. Therefore, it is preferable to be configured to be able to stop and move in the rehabilitation pipe.

  According to this configuration, since the injection hose has the tip pit capable of injecting the cooling water obliquely rearward, for example, if the water pressure of the injected cooling water is increased, the reaction of the injection to the inner surface of the rehabilitation pipe is increased. The injection hose can be advanced toward the other side in the axial direction by the force. Therefore, even in a small diameter renovated pipe that an operator cannot enter, it is possible to cool the renovated pipe while providing a relative temperature difference between one axial side and the other axial side of the regenerated pipe. .

  In the rehabilitating pipe construction method, the pair of sealing jigs are provided with a connection port to which a steam hose for taking gas in and out of the rehabilitating pipe can be connected, and an O-ring provided on the inner periphery. It is preferable to include a first sealing jig in which a through hole is formed and a second sealing jig in which only the connection port is formed.

  According to this structure, since the connection port which can connect the steam hose for taking in and out gas in the renovation pipe is formed in both the 1st and 2nd sealing jigs, for example from one steam hose If the compressed air is fed and the other steam hose is closed, the rehabilitation pipe can be expanded, and if both steam hoses are closed while the rehabilitation pipe is expanded, the pressure can be maintained. Furthermore, for example, if cool air is sent from one steam hose and the other steam hose is opened small, the rehabilitation pipe can be cooled from one side in the axial direction.

  Moreover, since the O-ring is provided in the inner peripheral portion of the through hole through which the injection hose penetrates, the internal pressure of the rehabilitation pipe is maintained in a state where the injection hose is in close contact with the through hole through the O-ring. The injection hose can be moved in the rehabilitation pipe.

  As described above, according to the rehabilitating pipe construction method according to the present invention, it is possible to reduce the residual stress generated in the axial direction of the rehabilitating pipe.

It is a figure which shows the outline of the construction method of the rehabilitation pipe | tube which concerns on embodiment of this invention. It is a perspective view which shows typically an example of a rehabilitation pipe | tube. It is sectional drawing which shows a 1st sealing jig | tool typically. It is a figure which shows an injection hose typically. It is a figure which illustrates the construction method of a rehabilitation pipe typically. It is a figure which illustrates typically the construction method of the renovated pipe which concerns on Embodiment 2. FIG. It is a figure which shows the modification of Embodiment 2 typically.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing an outline of a rehabilitation pipe construction method according to the present embodiment. In addition, the code | symbol 8 of FIG. 1 has shown the vapor generation pressurizer, and the code | symbol 9 has each shown the high pressure washing vehicle. In this rehabilitating pipe construction method, the inner surface of an existing pipe 2 such as a sewage pipe buried in the ground is lined by the rehabilitating pipe 1. More specifically, as shown in FIG. 1, this rehabilitation pipe construction method was inserted by inserting the rehabilitation pipe 1 into the existing pipe 2 in a non-cylindrical state from the starting side manhole M1 to the arrival side manhole M2. After the rehabilitation pipe 1 is heated and restored to a cylindrical shape, the inner surface of the existing pipe 2 is lined by the rehabilitation pipe 1 by pressurizing and expanding the diameter. Although the construction method of the rehabilitating pipe according to the present embodiment is not particularly limited in the diameter and length of the existing pipe 2 to be applied, for example, it is preferably used for a sewer pipe having a nominal diameter of 250 mm and a length of about 50 m. it can.

  Prior to the description of the rehabilitation pipe construction method, the rehabilitation pipe 1, the sealing jigs 3 and 4 and the injection hose 5 used in the construction method will be described.

  FIG. 2 is a perspective view schematically showing an example of the rehabilitation pipe 1 according to the present embodiment. The rehabilitation pipe 1 is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the existing pipe 2 by a thermoplastic resin such as polyvinyl chloride or high density polyethylene. The rehabilitation pipe 1 is formed in a non-cylindrical shape and is heated to a shape memory temperature (for example, 70 ° C.) as shown in FIG. 2A before being inserted into the existing pipe 2. As shown in FIG. 2B, the original cylindrical shape is restored. The outer diameter of the rehabilitated pipe 1 is not particularly defined, but is preferably 235 mm, for example, when the existing pipe 2 has a nominal diameter of 250 mm.

  FIG. 3 is a cross-sectional view schematically showing the first sealing jig 3 out of the pair of sealing jigs 3 and 4 that block both ends of the rehabilitation pipe 1. The first sealing jig 3 is attached to the start side end of the rehabilitation pipe 1. As shown in FIG. 3, the first sealing jig 3 is connected to the insertion portion 13 to be inserted inside the rehabilitation pipe 1 restored to a cylindrical shape, and connected to the insertion portion 13 via a bolt 33. A substantially disc-shaped lid portion 23. An annular seal member 13a is disposed on the outer peripheral surface of the insertion portion 13 so that the hermeticity of the rehabilitation pipe 1 is maintained, and in order to prevent the rehabilitation pipe 1 from coming out, A claw portion 13b that is hooked on the inner peripheral surface is formed. The lid portion 23 is formed with a connection port 23a and a through hole 23b that penetrate the lid portion 23, respectively. The connection port 23a is configured to be connectable to the first steam hose 6 for taking gas such as steam and compressed air into and out of the rehabilitation pipe 1. The first steam hose 6 is provided with an on-off valve 16 (see FIGS. 5 and 6), the first steam hose 6 is completely closed, and the first steam hose 6 is slightly opened. It is possible to switch to a state where the first steam hose 6 is completely released. The through-hole 23b has an O-ring 43 set on the inner periphery thereof, and the O-ring 43 contacts the outer peripheral surface of the injection hose 5 described later, so that the injection hose 5 penetrates the through-hole 23b in a close contact state. Is configured to do.

  In addition, the 2nd sealing jig 4 which comprises a pair of sealing jigs 3 and 4 which plugs up both ends of the rehabilitation pipe | tube 1 with the 1st sealing jig 3 is except that the through-hole 23b is not formed. The first sealing jig 3 is configured in the same manner. That is, the second sealing jig 4 also has the insertion portion 14 and the lid portion 24 in which the connection port 24a is formed, and the connection port 24a is a first for taking gas into and out of the rehabilitation pipe 1. Two steam hoses 7 are configured to be connectable. Further, the second steam hose 7 is also provided with an on-off valve 17 like the first steam hose 6, and the second steam hose 7 is slightly opened in a state where the second steam hose 7 is completely closed. It is possible to switch to a state, a state where the second steam hose 7 is completely released, and the like. The second sealing jig 4 is attached to the reaching end of the rehabilitating tube 1.

  FIG. 4 is a view schematically showing the injection hose 5. This injection hose 5 is inserted into the rehabilitation pipe 1 when both ends of the rehabilitation pipe 1 are closed by the first and second sealing jigs 3 and 4, as shown in FIG. A heat-resistant hose 15 and a tip pit 25 provided at the tip of the heat-resistant hose 15 are provided. In the tip pit 25, 8 to 10 injection holes 25a of φ1 mm to φ2 mm are intermittently formed in the circumferential direction. As a result, the tip pit 25 can inject the cooling water (heat medium) CW obliquely rearward over the entire circumference. This injection hose 5 is connected to a hose of a high-pressure washing vehicle 9 installed on the ground, and can be stopped and moved in the rehabilitation pipe 1 by adjusting the water pressure of the injected cooling water CW. It is configured. Specifically, when the water pressure of the cooling water CW is relatively low (for example, less than 2 MPa), the tip pit 25 does not move and the cooling water CW is injected at the same position, while the water pressure of the cooling water CW is relatively When it is increased (for example, 2 to 10 MPa), the tip pit 25 can be advanced toward the arrival side by the reaction force of the jet against the inner surface of the rehabilitation pipe 1 as shown by the white arrow in FIG. It is configured as follows. In addition, since the O-ring 43 is set in the inner peripheral portion of the through-hole 23b through which the injection hose 5 passes, in other words, the injection hose 5 is in close contact with the through-hole 23b through the O-ring 43. The injection hose 5 can be moved in the rehabilitation pipe 1 while maintaining the internal pressure of the pipe 1.

  Next, a method for constructing the rehabilitation pipe will be described. In FIG. 5, the existing pipe 2, the rehabilitation pipe 1, and the like are illustrated with the right side of the figure as the start side and the left side of the figure as the arrival side.

  The construction method of the rehabilitation pipe of this embodiment includes an insertion process, a restoration process, a closing process, a diameter expansion process, and a cooling process.

  First, in the insertion step, the rehabilitation pipe 1 made of a thermoplastic resin is inserted into the existing pipe 2 in a non-cylindrical state as shown in FIG. At this time, a pulling wire (not shown) is connected to the tip of the rehabilitation pipe 1 and a winch (not shown) is driven to wind the pulling wire so that the rehabilitation pipe 1 is drawn into the existing pipe 2. It may be. When the insertion of the rehabilitation pipe 1 into the existing pipe 2 is completed, the both ends of the rehabilitation pipe 1 are cut at the start side manhole M1 and the arrival side manhole M2 leaving a predetermined length from the pipe opening of the existing pipe 2. The predetermined length is set to a value that is at least longer than the axial length of the insertion portions 13 and 14 of the first and second sealing jigs 3 and 4.

  In the next restoration step, the rehabilitation pipe 1 inserted into the existing pipe 2 is heated to be restored to a cylindrical shape. Specifically, heating bags (not shown) are respectively placed on both ends of the rehabilitation pipe 1, steam is supplied into the heating bag from the steam generation pressurizer 8 through the first steam hose 6, and the rehabilitation pipe 1 is For example, it is heated until the surface temperature reaches 70 ° C. or higher to restore the original cylindrical shape.

  In the next closing step, both ends of the rehabilitated pipe 1 restored to the cylindrical shape are closed by the first and second sealing jigs 3 and 4 with the tip of the injection hose 5 being inserted into the rehabilitated pipe 1. . Specifically, after removing the heating bag from both ends of the rehabilitation pipe 1, the first sealing jig 3 is started in the rehabilitation pipe 1 in a state where the injection hose 5 protrudes from the through hole 23 b toward the insertion part 13. While attaching to a side edge part, the 2nd sealing jig 4 is attached to the arrival side edge part in the rehabilitation pipe | tube 1. FIG. Thereby, both ends of the rehabilitation pipe 1 are blocked in a state where the tip pit 25 is located at the start side end of the rehabilitation pipe 1.

  In the next diameter expansion step, the diameter of the rehabilitation pipe 1 whose both ends are closed is increased by pressurization. Specifically, the first steam hose 6 is attached to the connection port 23 a of the first sealing jig 3, and the second steam hose 7 is attached to the connection port 24 a of the second sealing jig 4. Then, the opening / closing valve 16 of the first steam hose 6 is opened and the opening / closing valve 17 of the second steam hose 7 is completely closed, and compression is performed from the steam generating pressurizer 8 through the first steam hose 6. Air is supplied into the rehabilitation pipe 1. Thereby, the diameter of the rehabilitation pipe | tube 1 is expanded by 0.08-0.15 MPa, for example, and the inner surface of the existing pipe | tube 2 is lined with the rehabilitation pipe | tube 1. FIG. After the rehabilitation pipe 1 has sufficiently expanded in diameter, the on-off valve 16 of the first steam hose 6 is completely closed to stop the supply of compressed air, and the on-off valve 17 of the second steam hose 7 is completely closed. Or slightly open to maintain pressure.

  In the next cooling step, by injecting the heat medium from the tip of the injection hose 5 in the expanded regenerative pipe 1, the start side (one axial direction) and the arrival side (the other axial side) The rehabilitation pipe 1 is cooled while providing a relative temperature difference with the above. Specifically, in the cooling process of the present embodiment, the regenerated pipe is moved by moving the front pit 25 from the start side to the arrival side in the rehabilitated pipe 1 while injecting the cooling water CW from the injection port 25a of the front pit 25. 1 is gradually cooled from the start side to the arrival side.

  More specifically, as shown in FIG. 5 (a), the coolant water CW at 20 ° C. is injected from the tip pit 25 at a water pressure of, for example, less than 2 MPa without moving the tip pit 25, thereby approximately 5 m in the axial direction. Is cooled for about 10 minutes, and the temperature at the start side end of the rehabilitation pipe 1 is lowered to about 30 ° C. Thereafter, as shown in FIG. 5B, the cooling water CW is injected from the tip pit 25 with a water pressure of 2 to 10 MPa, for example, and the tip pit 25 is directed toward the arrival side by the reaction force of the jet against the inner surface of the rehabilitation pipe 1. Move forward about 5m. Then, as shown in FIG. 5 (c), at a point advanced by about 5 m, by injecting cooling water CW of 20 ° C. with a water pressure of, for example, less than 2 MPa from the tip pit 25, the range of about 5 m is reduced to about 5 m. Cool for about 10 minutes and lower the temperature of the rehabilitation pipe 1 at that point to about 30 ° C. By repeating this, the rehabilitation pipe 1 is cooled from the start side toward the arrival side. The cooling water CW injected into the rehabilitating pipe 1 is discharged from the rehabilitating pipe 1 or the first or second sealing jigs 3 and 4 protruding a predetermined length from the pipe opening of the existing pipe 2 ( Since it is discharged from (not shown), it does not accumulate in the rehabilitation pipe 1.

  Thus, when the rehabilitation pipe 1 is cooled from the start side toward the arrival side, the rehabilitation pipe 1 is forcibly contracted from the start side due to the contraction force due to linear expansion. Here, since the hardening by cooling has not yet progressed on the reach side where the temperature is relatively high, the frictional resistance generated between the inner surface of the existing pipe 2 and the outer surface of the renovated pipe 1 is relatively small. Therefore, curing of the rehabilitating tube 1 proceeds from the starting side to the reaching side in a state where only a small frictional resistance is generated. Thereby, when cooling progresses to the reaching side end in the rehabilitation pipe 1, the residual stress generated in the rehabilitation pipe 1 can be reduced as compared with the case where the rehabilitation pipe 1 is uniformly air-cooled over its entire length. it can.

(Embodiment 2)
In the first embodiment, the regenerative pipe 1 is provided with a relative temperature difference between the start side and the arrival side by moving the tip pit 25 from the start side toward the arrival side while injecting the cooling water CW. However, the present embodiment supplies a low-temperature compressed air CA from the start side and maintains the reaching end at a high temperature, thereby providing a relative temperature difference between the start side and the reaching side. The provision point is different from that of the first embodiment. Hereinafter, a description will be given focusing on differences from Embodiment 1.

  In the rehabilitation pipe construction method of this embodiment, the same rehabilitation pipe 1 as in the first embodiment, the first and second sealing jigs 3 and 4, and the injection hose 5 are used. In addition, the insertion process, the restoration process, and the closing process are exactly the same as those in the first embodiment, and thus description thereof is omitted. In FIG. 6 below, the existing pipe 2 and the rehabilitation pipe 1 are shown with the right side of the figure as the start side and the left side of the figure as the arrival side.

  In the diameter expansion step, the opening / closing valve 16 of the first steam hose 6 is opened, and the opening / closing valve 17 of the second steam hose 7 is completely closed, and the steam generation pressurizer 8 passes through the first steam hose 6. By supplying compressed air into the rehabilitation pipe 1, the rehabilitation pipe 1 is expanded in diameter by, for example, 0.08 to 0.15 MPa, and the inner surface of the existing pipe 2 is lined by the rehabilitation pipe 1. After the diameter of the rehabilitation pipe 1 is sufficiently expanded, the on-off valve 16 of the first steam hose 6 is kept open and the on-off valve 17 of the second steam hose 7 is slightly opened.

  In the next cooling step, the regenerated pipe 1 is supplied from the steam generating pressurizer 8 through the first steam hose 6 by supplying compressed air (cold air) CA at a low temperature of 5 to 40 ° C., for example, into the regenerated pipe 1. Cool from the start side to the arrival side. More specifically, when low temperature compressed air CA is supplied from the start side through the first steam hose 6, the warm air in the rehabilitation pipe 1 is regenerated from the second steam hose 7 with the opening / closing valve 17 slightly opened. 1 is discharged outside. As a result, the rehabilitation pipe 1 is cooled from the start side toward the arrival side while the pressure in the rehabilitation pipe 1 is maintained. By continuing such cooling with the low-temperature compressed air CA for 30 to 60 minutes, for example, the rehabilitation pipe 1 can be cooled to the end portion on the arrival side and cured.

  In a series of flows from the diameter expansion process to the cooling process, the low-temperature compressed air CA is supplied to the regenerated pipe 1 through the first steam hose 6 with the on-off valve 17 of the second steam hose 7 completely closed. After the rehabilitation pipe 1 has sufficiently expanded in diameter, the on-off valve 17 of the second steam hose 7 may be slightly opened and the supply of the low-temperature compressed air CA may be continued to proceed to the cooling process. . Even if it does in this way, since the time until the rehabilitation pipe 1 expands is short, the rehabilitation pipe 1 as a whole is not cooled. Further, in a state where the on-off valve 17 of the second steam hose 7 is completely closed, compressed air having a temperature lower than that of the steam and higher than that of the compressed air CA having a temperature lower than that of the steam is passed through the first steam hose 6 into the rehabilitation pipe 1. After the rehabilitation pipe 1 has sufficiently expanded in diameter, the on-off valve 17 of the second steam hose 7 is slightly opened, and the gas supplied through the first steam hose 6 is switched to the low-temperature compressed air CA. Thus, the cooling process may be performed.

  By the way, as described above, the cooling with the low-temperature compressed air CA is performed, for example, for 30 to 60 minutes. Therefore, simply supplying the low-temperature compressed air CA from the start side of the rehabilitation pipe 1 reaches the start side of the rehabilitation pipe 1. The side end portions may be cooled and hardened almost simultaneously, and it may be difficult to force the rehabilitation tube 1 to be forcibly contracted from one side due to the contraction force due to linear expansion.

  Therefore, in the rehabilitation pipe construction method of this embodiment, the tip pit 25 of the injection hose 5 located at the arrival side end of the rehabilitation pipe 1 while sending low-temperature compressed air CA from the start side to the arrival side of the rehabilitation pipe 1. By injecting warm air (heat medium) WA from the end, the reaching end of the rehabilitation pipe 1 is kept at a high temperature.

  Specifically, as shown in FIG. 6A, the opening / closing valve 17 of the second steam hose 7 is slightly opened and the supply of the low-temperature compressed air CA is started or after that, as shown in FIG. For example, hot water HW of 40 to 60 ° C. is injected at a water pressure of 2 to 10 MPa, and the tip pit 25 is advanced to the arrival side end of the rehabilitation pipe 1 by the reaction force of the injection against the inner surface of the rehabilitation pipe 1. Next, as shown in FIG. 6 (b), the tip pit 25 of the injection hose 5 located at the end on the arrival side in the rehabilitation pipe 1 while continuing to supply the low-temperature compressed air CA from the start side in the rehabilitation pipe 1. To 45 to 60 ° C. hot air WA. In this case, the heat-resistant hose 15 connected to the hose or the like of the high-pressure washing vehicle 9 is connected again to, for example, a steam generating pressurizer (not shown) different from the steam generating pressurizer 8. Then, the injection amount of the hot air WA from the front pit 25 is gradually reduced, or the temperature of the hot air WA is gradually lowered. Finally, as shown in FIG. Is stopped, and the end portion on the reaching side of the rehabilitation pipe 1 is cooled by the low-temperature compressed air CA.

  As described above, according to the present embodiment, since the warm air WA is injected from the tip pit 25 of the injection hose 5 located at the end on the arrival side of the rehabilitation pipe 1, the rehabilitation pipe 1 is started by the low-temperature compressed air CA. In the middle of cooling from the side, it is possible to prevent the reaching-side end portion of the rehabilitation pipe 1 from being naturally cooled and cured. Therefore, the rehabilitation pipe 1 can be forcibly contracted from the start side by the contraction force due to the linear expansion, and the residual stress generated in the rehabilitation pipe 1 can be reduced.

-Modification of Embodiment 2-
In the second embodiment, the opening / closing valve 17 of the second steam hose 7 is slightly opened and the supply of the low-temperature compressed air CA is started or at the same time or before, the leading end pit 25 is extended to the end of the rehabilitating pipe 1 at the arrival side. Although advanced, this modified example is different from the second embodiment in that the tip pit 25 is arranged in advance at the end of the rehabilitating tube 1.

  Specifically, in this modification, in the closing step, the second sealing jig 4 is attached to the start side end portion of the rehabilitation pipe 1, and the injection hose 5 protrudes from the through hole 23b to the insertion portion 13 side. Then, the 1st sealing jig 3 is attached to the arrival side edge part in the rehabilitation pipe | tube 1. FIG. Thereby, both ends of the rehabilitation pipe 1 are closed in a state where the tip pit 25 is located at the reaching end of the rehabilitation pipe 1.

  Thereafter, at the same time as or before and after the start of the supply of the low-temperature compressed air CA, as shown in FIG. 7, from the front end pits 25 to 45 to 60 of the injection hose 5 located at the reaching end of the rehabilitation pipe 1. If hot air WA at 0 ° C. is injected, the regenerated pipe 1 can be cooled from the starting side by the low-temperature compressed air CA while keeping the reaching end of the regenerated pipe 1 at a high temperature, as in the second embodiment. it can.

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In each of the above embodiments, the first and second sealing jigs 3 and 4 are respectively attached to the end portions of the rehabilitation pipe 1 by inserting the insertion portions 13 and 14 into the rehabilitation pipe 1. In addition, a fastening band (not shown) is wound around the outer periphery of the rehabilitated tube 1 and the rehabilitated tube 1 is sandwiched in the radial direction between the fastening band and the insertion portions 13 and 14, so that the first and second seals are sealed. The fixing jigs 3 and 4 may be more firmly attached to the rehabilitation pipe 1.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  According to the present invention, since the residual stress generated in the axial direction of the rehabilitated pipe can be reduced, it is extremely useful when applied to a method for constructing the rehabilitated pipe.

DESCRIPTION OF SYMBOLS 1 Rehabilitation pipe 2 Existing pipe 3 1st sealing jig 4 2nd sealing jig 5 Injection hose 6 1st steam hose 7 2nd steam hose 15 Heat-resistant hose 23a Connection port 23b Through-hole 24a Connection port 25 Tip pit (tip Part)
43 O-ring CA Low-temperature compressed air (cold air)
CW Cooling water (heat medium)
WA warm air

Claims (5)

A rehabilitation pipe construction method in which the inner surface of an existing pipe is lined with a rehabilitation pipe,
An insertion step of inserting the rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into the existing pipe in a non-cylindrical state;
A restoration step of restoring the cylindrical shape by heating the rehabilitation pipe inserted into the existing pipe;
The tip of the injection hose is formed by a pair of sealing jigs including a sealing jig in which a through-hole through which the injection hose penetrates in close contact with both ends of the rehabilitation pipe restored to the cylindrical shape. A blockage step of closing the rehabilitation tube while being inserted;
A diameter expansion step for expanding the diameter by pressurizing the rehabilitation pipe whose both ends are blocked;
The rehabilitation pipe is provided with a relative temperature difference between one axial side and the other axial side of the rehabilitation pipe by injecting a heat medium from the tip of the injection hose within the enlarged diameter rehabilitation pipe. And a cooling process for cooling the pipe. In the construction method of the rehabilitation pipe according to claim 1,
The heat medium is cooling water,
In the cooling step, the rehabilitating pipe construction method is characterized in that the front end part of the injection hose is moved from one axial side of the rehabilitation pipe to the other side while injecting cooling water from the front end part of the injection hose. . In the construction method of the rehabilitation pipe according to claim 1,
The heat medium is warm air,
In the cooling step, while sending cool air from one axial side of the rehabilitation pipe to the other side in the axial direction, hot air is injected from the tip of the injection hose located at the end of the other side of the rehabilitation pipe. Rehabilitation pipe construction method characterized by that. In the construction method of the rehabilitation pipe according to claim 2 or 3,
The injection hose includes a tip pit capable of injecting cooling water obliquely rearward over the entire circumference and a heat-resistant hose, and stops and moves in the rehabilitation pipe by adjusting the water pressure of the injected cooling water. The construction method of the rehabilitation pipe | tube characterized by the above-mentioned being comprised. In the construction method of the rehabilitation pipe according to any one of claims 1 to 4,
The pair of sealing jigs is a first in which a connection port to which a steam hose for taking gas in and out of the rehabilitation pipe can be connected, and the through hole in which an O-ring is provided on an inner peripheral portion is formed. A rehabilitating pipe construction method comprising: a sealing jig; and a second sealing jig in which only the connection port is formed.

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