JP2007283540A - Regeneration method of existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regeneration method of an existing pipe which efficiently regenerates a plurality of existing pipes in a manhole with which the opening ends of a plurality of the existing pipes are faced to largely shorten the work time required in regeneration. <P>SOLUTION: When at least two existing pipes 20 to be regenerated of a plurality of the existing pipes embedded in the ground exist, a regeneration pipe 30, which has a cross section smaller than that of each of the existing pipes 20 and comprises a thermoplastic resin, is inserted in each of the existing pipes 20 to be regenerated and heated and internally pressurized to be increased in its diameter to be internally provided to the inner surface of each of the existing pipes 20 in a close contact state. In this regeneration method of the existing pipe, the regeneration pipes 30 are inserted in all of the existing pipes 20 through the manhole 10 with which the opening ends 21 of the existing pipes 20 are faced before each of the existing pipes 20 is increased in its diameter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for rehabilitating a plurality of existing pipes buried in the ground.

  Existing pipes buried in the ground are reinforced and restored in various ways when they are aging.

  As a method for rehabilitating the existing pipe, Patent Document 1 proposes a method of providing a rehabilitation pipe made of a thermoplastic resin on the inner surface of the existing pipe. The rehabilitation pipe used here is in a state of being folded so that the cross-sectional area is smaller than the inner diameter of the existing pipe, and can be restored to a cylindrical shape when heated to a predetermined temperature from that state. Has an effect.

In this rehabilitation method, as shown in FIG. 7, first, the rehabilitated pipe 130 in a folded state is inserted into the existing pipe 120 (hereinafter referred to as the first step), and heated gas is supplied into the rehabilitated pipe 130. Then, the rehabilitation pipe 130 is softened while being restored to a cylindrical shape (hereinafter referred to as the second step), and after the supply of the heated gas is stopped, pressurized air is supplied into the rehabilitation pipe 130, as shown in FIG. The diameter of the rehabilitation pipe 130 is increased (hereinafter referred to as the third step).
Japanese Patent Laid-Open No. 11-230212

  By the way, not only in cities and urban areas, but also in residential areas, undergrounding of power cables and communication cables has been actively performed in recent years from the viewpoint of landscape, effective use of ground space, and safety. In laying such a long cable in the ground, as shown in FIGS. 7 and 8, an existing pipe buried in the ground so as to communicate with a plurality of manholes 110, 111 installed at predetermined intervals. 120 is used, and the cable is laid by being inserted into the existing pipe 120. The above-described manholes 110 and 111 serve as relay points and branch points of the existing pipe 120, and are used for carrying in, connecting, and maintaining the cables. Further, when paying attention between the two manholes 110 and 111, in order to lay a plurality of cables in parallel, the above-described existing pipe 120 is often buried in a state in which a plurality of cables are arranged in parallel.

  Therefore, since the existing pipe 120 in which a plurality of pipes are arranged in parallel is divided by the manholes 110 and 111 by branching or relaying, as a result, the opening end of the existing pipe is not provided in one manhole 110 or 111. There are many states.

  Conventionally, in order to rehabilitate the plurality of existing pipes 120 through the manhole 110 in which a large number of open ends 121 of the plurality of existing pipes exist, the first existing pipe 120 is processed in the first step, as described above. After the rehabilitation in the order of the process and the third process, the second existing pipe 120 is renewed in the order of the first process, the second process and the third process, and the remaining existing pipes 120 are corrected in the same manner thereafter. In particular, the above steps were repeated as many as the number of existing pipes 120 requiring rehabilitation.

  Therefore, rehabilitating a plurality of existing pipes 120 in such a procedure not only increases the work time required for rehabilitation, but also increases construction costs such as labor costs, and the rehabilitation of the existing pipes 120 causes the road to be rehabilitated. When the traffic is regulated, there is a problem that traffic congestion is caused because long-time traffic regulation is required.

  The present invention has been made in view of the actual situation, and the purpose of the present invention is to efficiently rehabilitate a plurality of existing pipes in a manhole facing the open ends of a plurality of existing pipes, greatly increasing the work time required for rehabilitation. The object is to provide an existing pipe rehabilitation method that can be shortened.

  In order to solve the above-mentioned problem, the rehabilitation method for existing pipes according to the present invention is a method for rehabilitating existing pipes that need to be corrected when there are two or more existing pipes that need to be rehabilitated. A rehabilitation pipe made of a thermoplastic resin having a smaller cross-sectional area than the existing pipe is inserted into each, and the rehabilitation pipe is heated and pressurized from the inside to expand the diameter of the rehabilitation pipe. In the rehabilitation method for existing pipes that are installed in close contact with each other, before expanding the diameter of each rehabilitated pipe, inserting the rehabilitated pipe into all of these existing pipes through a manhole facing the open end of the existing pipe. Features.

  According to the present invention, since the rehabilitation pipes are inserted into all of the existing pipes through the manhole facing the open ends of the existing pipes before the diameters of the respective rehabilitation pipes are expanded, There is no need to perform a cumbersome task of rehabilitating each one.

  Therefore, it is possible to increase the diameter of all the rehabilitated pipes inserted into the existing pipes at once, or to increase the diameter of a plurality of rehabilitated pipes.

  Moreover, even if it heats up all the said correction pipes collectively, and expands all the correction pipes simultaneously by pressurizing from the inside to all the correction pipes collectively after that, Good.

  In this case, since all the calibrated pipes inserted into the existing pipes that require rehabilitation are expanded at the same time, unlike the conventional case, it is necessary to perform a troublesome operation such as expanding the regenerated pipes one by one. Therefore, the construction time can be greatly reduced.

  In addition, all the correction pipes are heated together, and then all the correction pipes are pressurized from the inside under the optimum conditions for each correction pipe. May be expanded at the same time.

  In this case, when expanding the rehabilitation pipes at the same time, pressurize the rehabilitation pipes under the optimum conditions for each rehabilitation pipe, so even if the thickness and diameter of the rehabilitation pipes are different, it is good. In addition, the diameter of the rehabilitating pipe can be increased, and the troublesome work of increasing the diameter of the rehabilitating pipe one by one is not required, and the construction time can be greatly shortened.

  In addition, the correction pipes are divided into a plurality of groups, and after heating the correction pipes for each group, the diameter of the correction pipes is expanded by pressurizing from the inside, and the heating of the previous group is performed. Heating may be started in the next group after completion.

  For example, if all rehabilitation tubes are heated or pressurized together, the total volume of those rehabilitation tubes may become too large. In that case, it is difficult to distribute heated gas and pressurized air in all the rehabilitation pipes, and it takes time to reach all the rehabilitation pipes to the predetermined temperature or pressure, and heating or pressurization is insufficient. There is a risk of becoming. For this reason, a heating device or a pressurizing device having a large output is required, and the equipment cost is increased.

  However, in this case, all the rectifying pipes are divided into a plurality of groups, and the rectifying pipes are expanded in diameter by applying pressure from the inside after heating the rectifying pipes for each group. Since the heating is started in the next group after the heating of the group is completed, the diameter of the rehabilitation pipe can be sequentially increased for each group. That is, for example, after heating the rehabilitation tube of the first group, pressurizing the rehabilitation tube of the first group and heating the rehabilitation tube of the second group, and further, after heating of the rehabilitation tube of the second group is finished, It is possible to sequentially perform such operations as pressurizing the second group of rehabilitation pipes and heating the third group of rehabilitation pipes.

  Therefore, since all of the rehabilitation pipes inserted into the existing pipes are not heated or pressurized at a time, the total volume of the rehabilitation pipes to be heated or pressurized does not become too large, and a large output heating device or pressurizing device is required. There is nothing. That is, the diameter of the rehabilitating pipe can be increased by an appropriate number according to the output of the heating device or pressurizing device that has been used so far.

  The rehabilitation method for existing pipes according to the present invention is an effect that a plurality of existing pipes can be rehabilitated efficiently in a manhole facing the open ends of a plurality of existing pipes, and the work time required for rehabilitation can be greatly reduced. Play.

  Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
1, 2 and 3 are schematic views showing the procedure of the rehabilitation method in the present embodiment. FIG. 1 is a process of inserting the rehabilitation pipe 30 into the existing pipe 20, and FIG. FIG. 3 shows a state where the diameter of the rehabilitation pipe 30 is expanded.

  The rehabilitation method of the existing pipe 20 in the present embodiment includes a first step of inserting the rehabilitation pipe 30 into the existing pipe 20, a second step of heating the rehabilitation pipe 30, and a third step of pressurizing the rehabilitation pipe 30. I have.

  First, as shown in FIG. 1, the 1st process of inserting the rehabilitation pipe | tube 30 in all the existing pipe | tubes 20 which require rehabilitation is performed.

  As shown in FIG. 1, a plurality of existing pipes 20 to be rehabilitated are arranged in parallel and embedded in two directions, and the open ends 21 of these existing pipes 20 face the manhole 10.

  Rehabilitation pipes 30 are inserted into the plurality of existing pipes 20 from the opening end 21 through the manhole 10. At that time, for example, there is an existing pipe 20 that has already been rehabilitated, an existing pipe 20 that is in good condition and does not require rehabilitation, and an existing pipe 20 that does not require rehabilitation, such as an existing pipe 20 that is rehabilitated later. In some cases, the rehabilitation pipe 30 is not inserted into the existing pipes 20.

  First, a number of rehabilitating pipes 30 are prepared for the number of existing pipes 20 to be rehabilitated on the ground around the manhole 10, and a pull-in plug (not shown) having a wire (not shown) connected to the tip of the rehabilitating pipe 30 is provided. ), The wire is drawn into the existing pipe 20 from the opening end 21 of the existing pipe 20 through the manhole 10, and the wire is connected to the winch (not shown) installed around the manhole 11 from the opening end 22 of the other manhole 11. Connect.

  By pulling the wire to the other manhole 11 side by this winch, the rehabilitation pipe 30 is inserted into the existing pipe 20 between the manholes 10 and 11, as shown in FIG. In this way, the rehabilitating pipes 30 are drawn into the existing pipes 20 one by one or plurally, and when the rehabilitating pipes 30 are drawn into all of the existing pipes 20 that require rehabilitation, as shown in FIG. The diameter expansion device 40 is connected to the rehabilitation pipe 30.

  As shown in FIG. 2, the diameter expansion device 40 includes a heating device 41 that generates heating gas, a pressurizing device 42 that generates pressurized air, a heating gas path 43 connected to the heating device 41, and a heating device. A pressurized air path 44 connected to the pressure device 42, a heating gas path 43 and the pressurized air path 44 are merged, and a branched path 45 branched and connected to the start end 31 side of each rehabilitating pipe 30; A discharge path 47 is provided which is connected to the end 32 side of each rehabilitation pipe 30 and joins the paths. The heating gas passage 43 is provided with a heating gas valve 43a for adjusting the flow rate of the heating gas supplied from the heating device 41, and the pressurized air passage 44 is supplied from the pressurizing device 42. A pressurized air valve 44a for adjusting the flow rate of the pressurized air is provided, and a discharge valve 47a for adjusting the amount of gas in the rehabilitation pipe 30 is provided in the discharge path 47. Further, the branch path 45 and the discharge path 47 are provided with pressure gauges 48 and 49 for measuring the pressure in the rehabilitation pipe 30, respectively.

  The heating device 41 is not particularly limited, and examples thereof include a boiler that can generate steam.

  The pressurizing device 42 is not particularly limited, and examples thereof include a compressor that can compress air.

  Next, the 2nd process of heating all the renovation pipe | tubes 30 inserted in the existing pipe | tube 20 collectively simultaneously is performed.

  Specifically, by opening the heating gas valve 43a of the heating gas path 43 by a predetermined amount, the heating gas generated by the heating device 41 is branched to the rehabilitation pipes 30 through the heating gas path 43 and the branch paths 45, All the rehabilitation pipes 30 are supplied simultaneously. With this heated gas, all the rehabilitation pipes 30 are softened while being restored to a cylindrical shape. At that time, by opening a predetermined amount of the discharge valve 47 a of the discharge path 47, it is possible to discharge excess heating gas or heated gas whose temperature has decreased from the discharge path 47.

  Next, as shown in FIG. 3, a third step is performed in which all the renovated pipes 30 inserted into the existing pipe 20 are simultaneously pressurized.

  Specifically, first, the heating gas valve 43a of the heating gas path 43 is closed, and the supply of the heating gas is stopped. Thereafter, by opening a predetermined amount of the pressurized air valve 44a of the pressurized air path 44, the pressurized air is branched from the pressurizing device 42 through the pressurized air path 44 to the rehabilitation pipes 30 through the branch path 45, Pressurized air is simultaneously supplied into all the rehabilitation pipes 30. All the softened rehabilitation pipes 30 are expanded in diameter by this pressurized air, and are installed in a state of being in close contact with the inner surface of the existing pipe 20. At that time, the pressure in each rehabilitating pipe 30 is measured by pressure gauges 48 and 49, and when the loaded pressure is not an appropriate value, the pressure is adjusted by the pressurized air valve 44a and the discharge valve 47a.

  Thereafter, the pressurized air valve 44 a of the pressurized air path 44 is closed, the supply of pressurized air is stopped, and further, the rehabilitating pipe 30 is cooled by flowing water and air into all the rehabilitating pipes 30.

  Finally, when the cooling of all the rehabilitating pipes 30 is completed, the start end 31 and the end end 32 of the rehabilitation pipes 30 are cut and finished so as to be aligned with the open ends 21 and 22 of the existing pipe 20.

  As described above, the rehabilitation method for the existing pipe 20 in the present embodiment can be performed satisfactorily, and the work can be completed in a short time compared to the conventional method.

[Embodiment 2]
4 and 5 are schematic views showing the procedure of the rehabilitation method for the existing pipe 20 in the present embodiment. FIG. 4 shows a state in which the diameter expansion device 40 is attached to the rehabilitation pipe 30, and FIG. The state which expanded diameter is shown, respectively.

  The rehabilitation method of the existing pipe 20 in the present embodiment includes a first step of inserting the rehabilitation pipe 30 into the existing pipe 20, a second step of heating the rehabilitation pipe 30, and a third step of pressurizing the rehabilitation pipe 30. I have.

  The rehabilitation method of the present embodiment is the same as that of the first embodiment described above, and the first step is the same as the first embodiment. The 2nd process, the 3rd process, and diameter expansion device 40 are explained.

  As shown in FIG. 4, the diameter expansion device 40 used in the present embodiment is connected to a heating device 41 that generates heating gas, a pressurization device 42 that generates pressurized air, and the heating device 41. The heated gas path 43, the pressurized air path 44 connected to the pressurizing device 42, and the heated gas path 43 and the pressurized air path 44 are merged and branched and connected to the start end 31 side of each rehabilitating pipe 30. And a plurality of discharge paths 47 connected to the end 32 side of each rehabilitating pipe 30. The heating gas passage 43 is provided with a heating gas valve 43a for adjusting the flow rate of the heating gas supplied from the heating device 41, and the pressurized air passage 44 is supplied from the pressurizing device 42. A pressurized air valve 44a for adjusting the flow rate of the pressurized air is provided, and each discharge path 47 is provided with a discharge valve 47a for adjusting the amount of gas in the rehabilitation pipe 30. Further, the branched portion of the branch path 45 is provided with an adjustment valve 45a that can adjust the gas flow rate for each rehabilitation pipe 30 and a pressure gauge 48 that measures the pressure in each rehabilitation pipe 30, respectively. Each discharge path 47 is provided with a pressure gauge 49 for measuring the pressure in each rehabilitation pipe 30.

  The heating device 41 is not particularly limited, and examples thereof include a boiler that can generate steam.

  The pressurizing device 42 is not particularly limited, and examples thereof include a compressor that can compress air.

  First, when the first step of inserting the rehabilitated pipe 30 into all the existing pipes 20 requiring rehabilitation is completed, a second step of simultaneously heating all the rehabilitated pipes 30 inserted into the existing pipe 20 is performed.

  Specifically, the heating gas valve 43a of the heating gas path 43 is opened by a predetermined amount, and the adjustment valves 45a of the branch path 45 are opened. As a result, the heating gas generated by the heating device 41 is branched into the rehabilitation pipes 30 through the heating gas path 43 and the branch paths 45, and is supplied to all the rehabilitation pipes 30 simultaneously. With this heated gas, all the rehabilitation pipes 30 are softened while being restored to a cylindrical shape. At that time, by opening a predetermined amount of each discharge valve 47 a of each discharge path 47, it is possible to discharge surplus heating gas or heated gas whose temperature has decreased from each discharge path 47.

  Next, as shown in FIG. 5, a third step is performed in which all the renovated pipes 30 inserted into the existing pipe 20 are simultaneously pressurized under the optimum conditions for each of the renewed pipes.

  Specifically, first, the heating gas valve 43a of the heating gas path 43 and the control valves 45a of the branch path 45 are closed, and the supply of the heating gas is stopped. Thereafter, the pressurized air valve 44a of the pressurized air path 44 is opened by a predetermined amount, and each pressure of the branch path 45 is set so that the pressurized air supplied to each rehabilitating pipe 30 becomes the optimum pressure condition for each rehabilitating pipe 30. While checking with a total of 48, each control valve 45a is opened. As a result, the pressurized air generated by the pressurizing device 42 is branched to the rehabilitation pipes 30 through the pressurized air path 44 and at the branch paths 45, and the pressurized air at the pressure adjusted by the respective regulating valves 45 a. Are fed into all the rehabilitation pipes 30 simultaneously. With this pressurized air, all of the softened rehabilitation pipe 30 is expanded in diameter under the optimum pressure condition, and is installed in a state of being in close contact with the inner surface of the existing pipe 20. At that time, the pressure in each rehabilitation pipe 30 is measured by each pressure gauge 48, 49, and if the applied pressure is not an appropriate value, the pressure is adjusted by each adjustment valve 45a and each discharge valve 47a.

  Thereafter, the pressurized air valve 44a and each regulating valve 45a of the pressurized air path 44 are closed, supply of pressurized air is stopped, and water and air are allowed to flow through all the rehabilitating pipes 30 to cool the rehabilitating pipes 30. To do.

  Finally, when the cooling of all the rehabilitating pipes 30 is completed, the start end 31 and the end end 32 of the rehabilitation pipes 30 are cut and finished so as to be aligned with the open ends 21 and 22 of the existing pipe 20.

  As described above, the rehabilitation method for the existing pipe 20 in the present embodiment can be performed satisfactorily, and the work can be completed in a short time compared to the conventional method.

[Embodiment 3]
FIG. 6 is a schematic view showing a part of the diameter expansion device 40 used in the rehabilitation method for the existing pipe 20 in the present embodiment.

  The rehabilitation method for the existing pipe 20 in the present embodiment includes a first step of inserting the rehabilitation pipe 30 into the existing pipe 20 and a second step of expanding the diameter by heating and pressurizing the rehabilitation pipe 30.

  The rehabilitation method of the present embodiment is the same as that of the first embodiment described above, and the first step is the same as the first embodiment. A 2nd process and the diameter expansion apparatus 40 are demonstrated.

  As shown in FIG. 6, the diameter expansion device 40 used in the present embodiment is connected to a heating device 41 that generates heated gas, a pressure device 42 that generates pressurized air, and the heating device 41. A heated gas path 43 branched by the number of rehabilitation pipes 30, a pressurized air path 44 connected to the pressurizing device 42 and branched by the number of rehabilitation pipes 30, and a heated gas path 43 and a pressurized air path. 44 and a start end side path 46 connected to the start end 31 side of each rehabilitation pipe 30 and a plurality of discharge paths (not shown) connected to the end 32 side of each rehabilitation pipe 30. I have. In addition, the branched portion of the heating gas path 43 is provided with a heating gas valve 43a for adjusting the flow rate of the heating gas supplied from the heating device 41 for each rehabilitation pipe 30, and Among the branched portions, a pressurized air valve 44a for adjusting the flow rate of the pressurized air supplied from the pressurizing device 42 for each rehabilitation pipe 30 is provided, and in the discharge path, the inside of the rehabilitation pipe 30 is provided. A discharge valve (not shown) for adjusting the amount of gas is provided. Furthermore, a pressure gauge 48 for measuring the pressure for each rehabilitating pipe 30 is provided in each starting end side path 46 and each discharge path.

  The heating device 41 is not particularly limited, and examples thereof include a boiler that can generate steam.

  The pressurizing device 42 is not particularly limited, and examples thereof include a compressor that can compress air.

  First, when the 1st process of inserting the rehabilitation pipe | tube 30 in all the existing pipes 20 which require rehabilitation is complete | finished, the 2nd process which expands the diameter of the renovation pipe | tube 30 will be performed. Here, every group to which the diameter of all the rehabilitated pipes 30 is expanded simultaneously is arbitrarily divided into a first group 33, a second group 34, a third group 35,.

  First, all the rehabilitation pipes 30 in the first group 33 are heated at the same time. Specifically, each heating gas valve 43a of the heating gas path 43 corresponding to each rehabilitation pipe 30 of the first group 33 is opened by a predetermined amount. Thereby, the heating gas produced | generated with the heating apparatus 41 passes through the heating gas path | route 43 and the start end side path | route 46 corresponding to each rehabilitation pipe | tube 30 of the 1st group 33, and enters each rehabilitation pipe | tube 30 of the 1st group 33. It is supplied at the same time. By this heating gas, each rehabilitation pipe 30 of the first group 33 is softened while being restored to a cylindrical shape. At this time, by opening a predetermined amount of each discharge valve of each discharge path, it is possible to discharge surplus heating gas or heated gas whose temperature has decreased from each discharge path.

  Next, with respect to all the rehabilitation pipe | tubes 30 of the 1st group 33, it pressurizes simultaneously for each rehabilitation pipe | tube 30 collectively on optimal conditions. Specifically, first, the heating gas valve 43a of each heating gas path 43 corresponding to each rehabilitation pipe 30 of the first group is closed, and the supply of the heating gas is stopped. Thereafter, the pressure air valves 44a corresponding to the respective rehabilitating pipes 30 of the first group 33 are respectively set while checking with the respective pressure gauges 48 of the starting end side path 46 so that the optimum pressure condition for each rehabilitating pipe 30 is obtained. Open quantitatively. As a result, the pressurized air generated by the pressurizing device 42 passes through the pressurized air path 44 and the start end side path 46 corresponding to the rehabilitated pipes 30 of the first group 33, and the rehabilitated pipes 30 of the first group 33. Into the interior at the optimum pressure conditions. By this pressurized air, all of the softened rehabilitation pipes 30 of the first group 33 are expanded under the optimum pressure condition, and are installed in a state of being in close contact with the inner surface of the existing pipe 20.

  In addition, after the heating of the rehabilitation pipe 30 of the first group 33 is finished, the rehabilitation pipe 30 of the second group 34 is heated in the same manner as the heating method of the rehabilitation pipe 30 of the first group 33. At this time, the heating of the rehabilitating pipe 30 of the second group 34 may be performed while the rehabilitating pipe 30 of the first group 33 is being pressurized. You may go after.

  In addition, after pressurization of the rehabilitation pipe 30 of the first group 33 is finished and heating of the rehabilitation pipe 30 of the second group 34 is finished, Pressurization is performed in the same manner as the method for pressurizing the rehabilitation pipe 30.

  In this way, heating and pressurization of the rehabilitation pipes 30 are sequentially performed for each group, and all the rehabilitation pipes 30 are expanded in diameter.

  In addition, the rehabilitation method of the existing pipe 20 in this Embodiment does not heat or pressurize all the rehabilitation pipes 30 inserted into the existing pipe 20 at the same time as described above.

  For example, as in the first or second embodiment, when all the rehabilitating tubes 30 are heated or pressurized at once, the total volume of the rehabilitating tubes 30 may become too large. In that case, it is difficult to distribute heated gas and pressurized air in all the rehabilitating pipes 30, and it takes time to reach all the rehabilitating pipes 30 to a predetermined temperature or a predetermined pressure. May become insufficient. Therefore, the heating device 41 and the pressurizing device 42 having a large output are required, and the equipment cost is increased.

  However, in the rehabilitation method for the existing pipe 20 in the present embodiment, heating or pressurization can be performed without increasing the total volume of the rehabilitation pipe 30, and thus a heating device 41 and a pressurization device 42 with a large output are required. Never become. That is, according to the output of the heating device 41 and the pressurizing device 42 that have been used so far, the diameter of the rehabilitating pipe 30 can be increased by an appropriate number.

  Thereafter, when water and air are allowed to flow through all the rehabilitating pipes 30 and the rehabilitating pipes 30 are cooled and finished, the start end 31 and the end end 32 of these rehabilitation pipes 30 are aligned with the open ends 21 and 22 of the existing pipe 20 and cut. Finish.

  As described above, the rehabilitation method for the existing pipe 20 in the present embodiment can be performed satisfactorily, and the work can be completed in a short time compared to the conventional method.

It is the schematic which shows the 1st process of Embodiment 1 of the rehabilitation method of the existing pipe | tube in this invention. It is the schematic which shows the state which attached the diameter expansion apparatus to each rehabilitation pipe | tube of Embodiment 1 of the rehabilitation method of the existing pipe | tube in this invention. It is the schematic which shows the state which expanded each rehabilitation pipe | tube of Embodiment 1 of the rehabilitation method of the existing pipe | tube in this invention. It is the schematic which shows the state which attached the diameter expansion apparatus to each rehabilitation pipe | tube of Embodiment 2 of the rehabilitation method of the existing pipe | tube in this invention. It is the schematic which shows the state which expanded each rehabilitation pipe | tube of Embodiment 2 of the rehabilitation method of the existing pipe | tube in this invention. It is the schematic which shows a part of diameter expanding apparatus used in Embodiment 3 of the rehabilitation method of the existing pipe in this invention. It is the schematic which shows the state which attached the diameter expansion apparatus to the rehabilitation pipe | tube in the rehabilitation method of the existing existing pipe | tube. It is the schematic which shows the state which expanded the diameter of the renovated pipe in the conventional rehabilitation method of existing pipe.

Explanation of symbols

10, 11 Manhole 20 Existing pipe 21, 22 Open end 30 Rehabilitation pipe 40 Diameter expansion device

Claims (4)

Of two or more existing pipes buried in the ground, when there are two or more existing pipes that need to be rehabilitated, each of the existing pipes that need to be rehabilitated is made of a thermoplastic resin having a smaller cross-sectional area than the existing pipe In the rehabilitation method for the existing pipe, the rehabilitation pipe is heated and pressurized from the inside to expand the diameter of the rehabilitation pipe, and the rehabilitation pipe is installed in close contact with the inner surface of the existing pipe.
A method for rehabilitating an existing pipe, wherein the rehabilitated pipe is inserted into all of the existing pipes through a manhole facing the open end of the existing pipe before expanding the diameter of each rehabilitated pipe.   The heating is performed for all of the correction pipes at a time, and then all the correction pipes are simultaneously expanded by pressurizing all the correction pipes from the inside thereof. 1. A method for correcting an existing pipe according to 1.   All of the above-mentioned correction pipes are heated at once, and then all the correction pipes are simultaneously pressurized under the optimum conditions for each of the correction pipes so that all the correction pipes are simultaneously heated. 2. The method for correcting an existing pipe according to claim 1, wherein the diameter is expanded.   The correction pipe is divided into a plurality of groups, and after heating the correction pipe for each group, the diameter of the correction pipe is expanded by pressurizing from the inside, and the heating of the previous group is completed. The correction method according to any one of claims 1 to 4, wherein heating is started in the next group later.

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