JP4750610B2 - Rehabilitation of existing pipes - Google Patents

Description

  The present invention relates to a rehabilitation method for rehabilitating existing pipes such as aging communication cable pipes and sewer pipes.

  Conventionally, a rehabilitation pipe made of a thermoplastic resin having a diameter smaller than the inner diameter of the existing pipe is inserted into an existing pipe such as a communication cable pipe or a sewer pipe buried in the ground, and after heating the rehabilitation pipe, A rehabilitation method in which the diameter of the rehabilitation pipe is increased by pressing and the rehabilitation pipe is lined on the inner surface of the existing pipe has been proposed and widely implemented (see, for example, Patent Document 1).

Here, the heated rehabilitation pipe is cooled and solidified using air or water in an expanded state, but it takes a long time (about 1 day and night) until the temperature of the rehabilitation pipe becomes equal to the soil temperature. Therefore, the cooling is completed before the temperature of the rehabilitation pipe reaches the soil temperature. And if the temperature of a rehabilitation pipe | tube reaches | attains soil temperature, a rehabilitation pipe | tube will be cut | disconnected along the edge of an existing pipe | tube, and a finishing process of a cutting edge will be performed.
Japanese Patent Laid-Open No. 11-230212

  By the way, since cooling is completed before the temperature of the heated rehabilitation pipe reaches the soil temperature, the temperature of the rehabilitation pipe gradually decreases until it reaches the soil temperature, and the rehabilitation pipe has its linear expansion. The force to reduce by that amount will act. On the other hand, since the rehabilitation pipe is pressurized and expanded in diameter, the portion extending to the manhole side beyond the edge of the existing pipe expands more than the inner diameter of the existing pipe. Therefore, even if the rehabilitation pipe tries to shrink in the process of the temperature of the rehabilitation pipe decreasing, the portion extending from the edge of the existing pipe that has expanded beyond the inner diameter of the existing pipe cannot be shrunk due to a large resistance. In the rehabilitated pipe whose temperature is lowered to the soil temperature, a large residual stress remains. For this reason, in the rehabilitated pipe, even after the construction cut along the edge of the existing pipe, the force to be contracted continues to work, so that the length of the existing pipe is reduced or the residual length is reduced. The stress limits the expansion and contraction of the rehabilitation pipe due to ground fluctuations such as earthquakes, which may cause the rehabilitation pipe to break.

  The present invention has been made in view of such a problem, and even if the cooling is completed before the temperature of the heated rehabilitation pipe reaches the soil temperature, the temperature of the rehabilitation pipe reaches the soil temperature. To provide a method for rehabilitating existing pipes that can reduce the residual stress by allowing the rehabilitation pipes to shrink due to the linear expansion caused by the decrease in the length of the pipe, and that can reliably prevent the rehabilitation pipe from being insufficient in length or damaged after construction. Is.

  The present invention inserts a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into an existing pipe buried in the ground between manholes, heats the rehabilitation pipe, and then pressurizes it. In the method of rehabilitating an existing pipe that expands the diameter and lining the rehabilitated pipe to the inner surface of the existing pipe, before the rehabilitation pipe is inserted into the existing pipe, an expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is added to the manhole. It is characterized in that it extends partly to the side and is inserted into each end of the existing pipe.

  In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

  According to the present invention, when the existing pipe buried in the ground between the manholes is rehabilitated, in each manhole, the expansion suppression is formed at each end of the existing pipe to have an outer diameter substantially equal to the inner diameter of the existing pipe. Insert the tube. At this time, a part of the diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Subsequently, after inserting and heating a diameter expansion suppression pipe inserted in each end of the existing pipe and the existing pipe, the renewed pipe is pressurized and expanded, and is lined on the inner surface of the existing pipe. In this case, a diameter expansion suppression tube partially extending toward the manhole is inserted into each end of the existing tube, so that the rehabilitated tube immediately after the end of the existing tube is fixed. The expansion of the length portion is regulated to the inner diameter by the expansion suppression tube, and the expansion extends beyond the end of the expansion suppression tube beyond the inner diameter of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of the existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of the existing pipe.

  As a result, even if cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, a rehabilitated pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended beyond the edge of the existing pipe. Therefore, when the temperature of the rehabilitation pipe is lowered until reaching the temperature in the soil, and it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

  In addition, when using a split expansion pipe divided into two, after inserting the split expansion pipe divided into the ends of the existing pipes, they are tied together with a string or tape and fixed together. What is necessary is just to regulate so that a rehabilitation pipe may not expand. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

  The present invention inserts a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into an existing pipe buried in the ground between manholes, heats the rehabilitation pipe, and then pressurizes it. In the method of rehabilitating an existing pipe that expands the diameter and lines the rehabilitated pipe on the inner surface of the existing pipe, before heating the rehabilitated pipe, an expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is connected to the manhole side. It is characterized by extending the part and inserting it into each end of the existing pipe.

  In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

  According to the present invention, when rehabilitating an existing pipe buried in the ground between manholes, after inserting the rehabilitated pipe over the existing pipe, in each manhole, the inner diameter of the existing pipe is approximately equal to each end of the existing pipe. A diameter-increasing suppression tube having an equal outer diameter is inserted. At this time, a part of the diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Next, after the rehabilitation pipe is heated, the rehabilitation pipe is pressurized and expanded, and is lined on the inner surface of the existing pipe. In this case, a diameter expansion suppression tube partially extending toward the manhole is inserted into each end of the existing tube, so that the rehabilitated tube immediately after the end of the existing tube is fixed. The expansion of the length portion is regulated to the inner diameter by the expansion suppression tube, and the expansion extends beyond the end of the expansion suppression tube beyond the inner diameter of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of the existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of the existing pipe.

  As a result, even if cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, a rehabilitated pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended beyond the edge of the existing pipe. Therefore, when the temperature of the rehabilitation pipe is lowered until reaching the temperature in the soil, and it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

  In addition, when using a split expansion pipe divided into two, after inserting the split expansion pipe divided into the ends of the existing pipes, they are tied together with a string or tape and fixed together. What is necessary is just to regulate so that a rehabilitation pipe may not expand. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

  The present invention provides a plurality of existing pipes embedded in the ground between manholes with an outer diameter smaller than the inner diameter of the existing pipes so as to constitute one pipe line communicating between the plurality of manholes. In the rehabilitation method for existing pipes, one rehabilitation pipe made of thermoplastic resin is inserted, the rehabilitation pipe is heated and then pressurized to expand the diameter, and the rehabilitation pipe is lined on the inner surface of each existing pipe. Prior to inserting the pipe, in each manhole, an expansion suppressing pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended to the manhole side and inserted into each end of each existing pipe. It is characterized by this.

  In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

  According to the present invention, when renewing a plurality of existing pipes embedded in the ground between a plurality of manholes, the outer diameter of each manhole is substantially equal to the inner diameter of the existing pipe at each end of each existing pipe. Are inserted in order. At this time, a part of each diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Next, insert one rehabilitation pipe over the diameter expansion suppression pipe inserted into each end of each existing pipe and the existing pipe so as to constitute one pipe line communicating between the plurality of manholes. After heating, the rehabilitated tube is pressurized and expanded to line the inner surface of the existing tube. In this case, the diameter-increasing suppression tube partially extended to the manhole side is inserted into each end portion of each existing tube, so that the end edge of the existing tube of the rehabilitated tube is attached to each manhole. The portion of the fixed length immediately after the expansion is restricted to its inner diameter by the expansion suppression tube, and expands beyond the inner diameter of the expansion suppression tube from beyond the end edge of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, in each manhole, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of each existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of each existing pipe in each manhole.

  As a result, even if the cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, in each manhole, the rehabilitated pipe having an outer diameter that is substantially equal to the inner diameter of the existing pipe extends beyond the edge of the existing pipe. Since the part is extended, the temperature of the rehabilitation pipe decreases until reaching the temperature in the soil, and when it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

  In addition, when using a split expansion pipe divided into two, after inserting the split expansion pipe divided into the ends of the existing pipes, they are tied together with a string or tape and fixed together. What is necessary is just to regulate so that a rehabilitation pipe may not expand. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

  The present invention provides a plurality of existing pipes embedded in the ground between manholes with an outer diameter smaller than the inner diameter of the existing pipes so as to constitute one pipe line communicating between the plurality of manholes. In the rehabilitation method for existing pipes, one rehabilitation pipe made of a thermoplastic resin is inserted, the rehabilitation pipe is heated and then pressurized to expand the diameter, and the rehabilitation pipe is lined on the inner surface of each existing pipe. Prior to doing this, in each manhole, an expansion suppression tube having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended to the manhole side and inserted into each end of each existing pipe. It is what.

  In the present invention, the material of the diameter expansion suppression pipe is not particularly limited as long as it has a strength to suppress expansion of the rehabilitation pipe when pressurizing the rehabilitation pipe, for example, a metal such as iron or aluminum, vinyl chloride, Examples thereof include plastics such as PE, PP, and nylon, and glass cloth. In consideration of workability and cost, PE and nylon are preferable. In this case, it is preferable that the diameter of the expansion suppression pipe is thin so as not to cause a step in the rehabilitation pipe. Further, the diameter expansion suppression pipe may be formed in half, and the divided diameter expansion suppression pipe may be inserted into each end of the existing pipe and then fixed integrally.

  According to the present invention, when rehabilitating a plurality of existing pipes respectively buried in the ground between a plurality of manholes, a plurality of existing pipes are formed so as to constitute one pipe line communicating between the plurality of manholes. After inserting one rehabilitation pipe over the pipe, in each manhole, an expansion suppression pipe formed in an outer diameter substantially equal to the inner diameter of the existing pipe is sequentially inserted into each end portion of each existing pipe. At this time, a part of each diameter expansion suppression pipe is extended to the manhole side from the edge of the existing pipe. Next, after the rehabilitation pipe is heated, the rehabilitation pipe is pressurized and expanded, and is lined on the inner surface of the existing pipe. In this case, the diameter-increasing suppression tube partially extended to the manhole side is inserted into each end portion of each existing tube, so that the end edge of the existing tube of the rehabilitated tube is attached to each manhole. The portion of the fixed length immediately after the expansion is restricted to its inner diameter by the expansion suppression tube, and expands beyond the inner diameter of the expansion suppression tube from beyond the end edge of the expansion suppression tube. Then, the expanded rehabilitation pipe is cooled and solidified in that state, and cooling is completed when the temperature is lowered to a certain temperature. Thereafter, in each manhole, the rehabilitation pipe is cut together with the diameter expansion suppression pipe in a state where the set length is extended from the edge of each existing pipe to the manhole side. The cutting positions of the diameter expansion suppression pipe and the rehabilitation pipe are set in consideration of reduction due to the temperature drop of the rehabilitation pipe. Next, when the temperature of the rehabilitation pipe reaches the soil temperature, the diameter expansion suppression pipe and the rehabilitation pipe are cut along the edge of each existing pipe in each manhole.

  As a result, even if the cooling is completed in a state where the temperature of the rehabilitated pipe does not drop to the soil temperature, in each manhole, the rehabilitated pipe having an outer diameter that is substantially equal to the inner diameter of the existing pipe extends beyond the edge of the existing pipe. Since the part is extended, the temperature of the rehabilitation pipe decreases until reaching the temperature in the soil, and when it is attempted to reduce the amount corresponding to the linear expansion, it can be smoothly reduced without causing resistance. Therefore, residual stress does not remain in the rehabilitated pipe, and it is possible to reliably prevent the rehabilitated pipe from being short in length or damaged.

  In the middle manhole except for the manhole on the starting side and the manhole on the most downstream side, the rehabilitation pipe is extended through the manhole, so that the expansion of the diameter divided by two is suppressed in these middle manholes. It is necessary to use a tube. That is, after the divided diameter expansion suppression pipes are inserted into the ends of the existing pipes, they are bound together with a string or tape and fixed together, and the rehabilitation pipes are restricted from expanding during pressurization. When the lining is completed, after cutting the rehabilitation pipe along the edge of the expansion suppression pipe, the fixed expansion of the expansion suppression pipe is released, so that the divided expansion suppression pipes are separated from the existing pipes. Can be pulled out.

  According to the present invention, even if cooling is completed before the temperature of the heated rehabilitation pipe reaches the soil temperature, rehabilitation due to linear expansion accompanying the decrease of the rehabilitation pipe temperature until it is in equilibrium with the soil temperature. Residual stress can be eliminated by allowing the pipe to shrink, and the rehabilitated pipe can be prevented from being insufficiently short or broken after construction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show an embodiment of the existing pipe rehabilitation method of the present invention.

  In this rehabilitation method, the existing pipe S buried in the ground between adjacent manholes M and M ′ is rehabilitated. First, as shown in FIG. 1, the manhole M on the start side and the manhole M on the downstream side are provided. ', The expansion suppression tube 10 made of a thin plastic and having an outer diameter substantially equal to the inner diameter of the existing pipe S is provided with the other half of the manhole M and M' extending in the other half. It is inserted into each end of the tube S.

  Next, the pulling member 3 such as a wire or a rope is inserted from the manhole M on the starting side to the diameter-increasing suppression tube 10 inserted into each end of the existing pipe S and the existing pipe S, and the distal end portion of the rehabilitated pipe 1 in advance. After the traction member 3 is connected to the tip member 2 that is attached to the tip end and closes the tip opening in a sealed state, the traction member 3 is pulled from the manhole M ′ on the downstream side, thereby expanding the diameter as shown in FIG. The rehabilitation pipe 1 is inserted over the suppression pipe 10, the existing pipe S, and the diameter expansion suppression pipe 10.

  Here, the rehabilitation pipe 1 is formed in a cylindrical shape by a thermoplastic resin such as polyvinyl chloride or high-density polyethylene, and in a state before being inserted into the existing pipe S, the cross-sectional shape thereof is the existing pipe S. It is formed in a substantially elliptical shape having a smaller diameter than the inner diameter of the material, and is given the ability to recover its shape to its original cylindrical shape when heated to a shape memory temperature.

  If the rehabilitation pipe 1 is inserted over the diameter expansion suppression pipe 10, the existing pipe S, and the diameter expansion suppression pipe 10, the rear end member that closes the rear end opening of the rehabilitation pipe 1 in a sealed state is renewed, although not shown in detail. After being attached to the rear end of the pipe 1, the heating medium introduction pipe 4 is connected to a connection port of a rear end member (not shown), and steam is supplied to the rehabilitation pipe 1 from the steam generation pressurizer (not shown) through the heating medium introduction pipe 4. A reheating tube 1 is heated by supplying a heating medium such as. When the rehabilitation tube 1 is heated to the shape memory temperature, the shape is restored to the original cylindrical shape. When the rehabilitation pipe 1 recovers to a cylindrical shape, the heating is finished, high-pressure air is supplied from the steam generating pressurizer through the heating medium introduction pipe 4 to the rehabilitation pipe 1, and the softened rehabilitation pipe 1 is pressurized and expanded. . Thereby, the diameter-renewed rehabilitation pipe | tube 1 closely_contact | adheres to the inner surface of the existing pipe | tube S, as shown in FIG. Moreover, since the rehabilitation pipe | tube 1 is cooled with supply of high pressure air, the rehabilitation pipe | tube 1 hardens | cures in the state closely_contact | adhered to the inner surface of the existing pipe | tube S, and this shape is maintained. Thereby, the inner surface of the existing pipe S is lined by the renovated pipe 1.

  In this case, when the high pressure air is supplied and the rehabilitation pipe 1 expands, the portion of the rehabilitation pipe 1 beyond the edge of the diameter expansion suppression pipe 10 is not restricted by the diameter expansion suppression pipe 10, so that the diameter expansion suppression is performed. It has expanded beyond the inner diameter of the tube 10.

  When the lining of the existing pipe S by the rehabilitation pipe 1 is completed, the length of the rehabilitation pipe 1 is set to the manholes M and M ′ as shown in FIG. 4 in consideration of the reduction until the temperature of the rehabilitation pipe 1 reaches the soil temperature. The diameter expansion suppression tube 10 and the rehabilitation tube 1 are cut by extending the length. And if the temperature of the rehabilitation pipe | tube 1 reaches | attains soil temperature, as shown in FIG. 5, the diameter expansion suppression pipe | tube 10 and the rehabilitation pipe | tube 1 will be cut | disconnected along the edge of the existing pipe | tube S, and finishing of a cutting edge will be carried out. Processing.

  In the above-described embodiment, although not shown in detail, it is also possible to use a two-diameter expansion suppression tube. That is, in the case of using a split expansion suppression pipe divided into two, after the split expansion expansion pipe is inserted into the end of the existing pipe S separately, it is bound with a tape or the like and fixed integrally. When expanding by pressurization, the expansion of the rehabilitation pipe 1 is regulated. And if the pressurization is stopped, the rehabilitation pipe 1 is slightly reduced in diameter, and the rehabilitation pipe 1 is cut along the edge of the expansion prevention pipe 10 and then divided into two. Can be pulled out from the existing pipe S and removed from the rehabilitation pipe 1 separately. For this reason, the diameter expansion suppression pipe divided into two can be reused. And if the temperature of the rehabilitation pipe | tube 1 falls to soil temperature, the rehabilitation pipe | tube 1 should just be cut | disconnected along the edge of the existing pipe S, and the finishing process of an edge should just be performed.

  As a result, even if the cooling is completed before the temperature of the rehabilitating pipe 1 reaches the soil temperature, the expansion suppressing pipe 10 having an outer diameter substantially equal to the inner diameter of the existing pipe S is provided at the end of the existing pipe S. Since the tube S extends beyond the edge of the tube S and is partially extended and inserted into the manholes M and M ′, and the rehabilitation tube 1 is inserted into the diameter expansion suppression tube 10, When the temperature decreases until it reaches the soil temperature and the rehabilitation pipe 1 is to be reduced by its linear expansion, the part of the rehabilitation pipe 1 that is partly extended from the edge of the existing pipe S is suppressed from expanding. It can be smoothly reduced inward of the existing pipe S together with the pipe 10 or alone. Therefore, residual stress does not remain in the rehabilitation pipe 1, and it is possible to reliably prevent the rehabilitation pipe 1 from becoming insufficient in length or being damaged after construction.

  In addition, when the diameter-increasing suppression pipe 10 divided into two is adopted, the temperature of the rehabilitation pipe 1 is cured until the temperature of the rehabilitation pipe 1 reaches the soil temperature with the diameter-expansion suppression pipe 10 removed. Accordingly, when trying to reduce by the linear expansion, the part of the rehabilitation pipe 1 that is partially extended from the edge of the existing pipe S can be smoothly reduced inward of the existing pipe S. It is possible to reliably prevent the rehabilitation pipe 1 from becoming insufficient in length or being damaged after the construction.

  In the above-described embodiment, after the diameter-increasing suppression pipe 10 is inserted into each end of the existing pipe S in the starting-side manhole M and the downstream-side manhole M ′, the rehabilitation is performed from the starting-side manhole M. Although the case where the pipe 1 is inserted into the manhole M ′ on the downstream side through the diameter expansion suppression pipe 10, the existing pipe S, and the diameter expansion suppression pipe 10 has been described, as shown in FIG. After the rehabilitation pipe 1 is inserted into the existing pipe S and led to the manhole M ′ on the downstream side, the existing pipes are installed in the manholes M and M ′ on the starting side and downstream before the rehabilitation pipe 1 is heated and pressurized. You may insert the diameter expansion suppression pipe | tube 10 in each edge part of S (refer FIG. 2).

  In this case, in order to smoothly insert and avoid interference with the front end member 2 and the rear end member, a split expansion pipe divided into two parts is adopted, and the split expansion pipe divided into two is provided for each of the existing pipes S. After being attached to the end portion, it is preferable to use it by being bound with a tape or the like so as not to be detached and fixed integrally.

  Thereafter, the rehabilitation pipe 1 is heated, pressurized and expanded in diameter, and lined on the inner surface of the existing pipe S as described above, and detailed description thereof is omitted.

  Further, in the above-described embodiment, the case where one existing pipe S laid between adjacent manholes M and M ′ is renewed has been illustrated, but a plurality of existing pipes extending over three or more manholes are defined as one. You may make it rehabilitate by the rehabilitation pipe of a book.

  Specifically, as shown in FIG. 7, the manhole M on the start side, the manhole M ′ on the most downstream side, and one or more intermediate points between the manhole M on the start side and the manhole M ′ on the most downstream side In the rehabilitation of the existing pipes S when the manholes M ″ are arranged, the diameter expansion suppression pipes 10 are sequentially inserted into the respective end portions of the existing pipes S in the respective manholes M, M ″, M ′. After that, the rehabilitation pipe 1 is connected to the manhole M on the downstream side through the manhole M ′ on the downstream side and the manhole M ′ on the most downstream side, so that the rehabilitation pipe 1 is connected to the end of the diameter expansion suppression pipe. 10 is inserted into a plurality of existing pipes S, or one pipe line communicating from the starting manhole M through the intermediate manhole M ″ to the most downstream manhole M ′ is formed. In addition, rehabilitation pipe 1 is installed in multiple existing pipes Are inserted in the manhole M on the start side, the manhole M ′ on the most downstream side, and the manhole M ″ between the start side and the manholes M and M ′ on the start side and the most downstream side, respectively. What is necessary is just to insert the diameter expansion suppression pipe | tube 10 in a part in order, and work before the heating pressurization of the rehabilitation pipe | tube 1. FIG.

  In the case of the latter construction method, in the intermediate manhole M ″, since the rehabilitation pipe 1 is cut through the inside, it is necessary to adopt a diameter expansion suppression pipe divided in two.

  Thereafter, one rehabilitating pipe 1 is heated, pressurized, expanded in diameter, cooled and lined on the inner surface of the existing pipe S, and then the rehabilitating pipe 1 is reduced in each manhole M, M ″, M ′. Securing the allowance, cutting the rehabilitation pipe 1 together with the diameter expansion suppression pipe 10, or cutting the rehabilitation pipe 1 along the edge of the diameter expansion suppression pipe divided into two and extracting the diameter expansion suppression pipe divided into two; After curing the rehabilitation pipe 1 until the temperature of the rehabilitation pipe 1 is lowered to the soil temperature, the rehabilitation pipe 1 may be finally cut along the edge of the existing pipe S together with the diameter expansion suppression pipe 10 or independently.

  Thus, since a plurality of existing pipes S extending over a plurality of manholes M, M ″, M ′ can be renewed at the same time, work efficiency can be improved.

  As described above, according to the present invention, the residual stress is eliminated by allowing reduction of the rehabilitation pipe due to linear expansion accompanying the decrease in the temperature of the rehabilitation pipe until reaching the temperature in the soil, and the length of the rehabilitation pipe after construction is increased. Since the shortage and breakage can be reliably prevented, the rehabilitation pipe can be maintained over a long period of time.

It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. It is process drawing explaining the construction point of one Embodiment of the rehabilitation method of the existing pipe | tube of this invention. It is process drawing explaining the construction point of other embodiment of the rehabilitation method of the existing pipe | tube of this invention. It is process drawing explaining the construction point of another embodiment of the rehabilitation method of the existing pipe | tube of this invention.

Explanation of symbols

1 Rehabilitation pipe 10 Expansion control pipe M, M ', M "Manhole S Existing pipe

Claims (4)

  Insert a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into the existing pipe buried in the ground between manholes, and after heating the rehabilitation pipe, pressurize to expand the diameter, In the rehabilitation method for an existing pipe that lines the rehabilitation pipe on the inner surface of the existing pipe, before the rehabilitation pipe is inserted into the existing pipe, a part of the expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is provided on the manhole side. A method for rehabilitating an existing pipe, characterized by being extended and inserted into each end of the existing pipe.   Insert a rehabilitation pipe made of a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipe into the existing pipe buried in the ground between manholes, and after heating the rehabilitation pipe, pressurize to expand the diameter, In the method of rehabilitating an existing pipe that lines the rehabilitated pipe to the inner surface of the existing pipe, before the rehabilitated pipe is heated, a part of the expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is extended to the manhole side. A method for rehabilitating an existing pipe, which is inserted into each end of the existing pipe.   From a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipes, a plurality of existing pipes embedded in the ground between the manholes are formed so as to constitute one pipe line communicating between the plurality of manholes. In the rehabilitation method for existing pipes, the rehabilitation pipe is inserted into the existing pipe by inserting the one rehabilitation pipe, heating the rehabilitation pipe, then pressurizing and expanding the diameter, and lining the rehabilitation pipe on the inner surface of each existing pipe. Prior to the above, each manhole is characterized in that a diameter expansion suppression tube having an outer diameter substantially equal to the inner diameter of the existing tube is partially extended to the manhole side and inserted into each end portion of each existing tube. How to rehabilitate existing pipes.   From a thermoplastic resin having an outer diameter smaller than the inner diameter of the existing pipes, a plurality of existing pipes embedded in the ground between the manholes are formed so as to constitute one pipe line communicating between the plurality of manholes. Prior to heating the rehabilitating pipe in the rehabilitating method for existing pipes, in which the rehabilitating pipe is inserted, and the rehabilitation pipe is heated and then pressurized to expand the diameter, and the rehabilitation pipe is lined on the inner surface of each existing pipe. In each manhole, the existing pipe is characterized in that a diameter expansion suppression pipe having an outer diameter substantially equal to the inner diameter of the existing pipe is partially extended to the manhole side and inserted into each end portion of each existing pipe. Rehabilitation method.

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