Application method of rehabilitation material

Abstract

To improve watertightness from the flange of the branch pipe to the branch section of the main pipe at the other end, and to perform the rehabilitation of the branch section of the main pipe and the branch pipe as a single integrated process in a short period of time. [Solution] The method for applying the rehabilitation material is a method for applying a rehabilitation material to cover and rehabilitate the inner circumferential surface of an existing pipe 3 including the branch portion 10 between a main pipe 1 and a branch pipe 2, and comprises a main pipe rehabilitation step of installing a main pipe rehabilitation material 21 along the inner circumferential surface of the main pipe 1 including the branch portion 10, a drilling step of drilling a through hole 22 in the main pipe rehabilitation material 21 at the branch portion 10, and a branch pipe rehabilitation step of installing a branch pipe rehabilitation material 23 along the inner circumferential surface of the branch pipe 2, wherein the branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10, and the branch pipe rehabilitation step rehabilitates the area from the surface of the flange portion 5 to the through hole 22 integrally.

Description

Technical Field

[0001] The present invention relates to a method for constructing recycled materials.

Background Art

[0002] Conventionally, in sewers and drain pipes, repairs of pipe branch parts and existing main pipes have been carried out. In sewers and drain pipes, the branch parts of the pipes are damaged due to aging and deterioration over time. Therefore, in the case of sewers and drain pipes, generally only the branch parts of the pipes are repaired or recycled (for example, see Patent Document 1).

[0003] On the other hand, in water supply pipes and internal pressure pipes, in the case of aging and deterioration, for the main pipe, renewal and recycling are carried out by inserting an inner pipe. On the other hand, for the branch pipe, it is replaced with a new pipe. Note that for the branch pipe, resin may be applied to the branch part for recycling.

[0004] Here, the replacement of the branch pipe requires work (operation) of excavating the road and replacing the branch pipe. There are various problems in the work of replacing the branch pipe of the water supply pipe and the internal pressure pipe, such as a long water cut-off period during the work and the occurrence of disposal costs for the old pipe.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] First, consider applying the conventional repair (lining) of the branch part of the sewer to water supply pipes and internal pressure pipes as well.

[0007] When techniques used to repair sewer pipe branches are applied to water supply pipes and internal pressure pipes, water pressure is applied between the lined coating and the existing pipe. Therefore, when techniques used to repair sewer pipes are applied to water supply pipe branches, there is a problem in that water leaks through the gap between the coating and the existing pipe. In this case, if water leaks through the gap between the coating and the existing pipe, water can get behind the coating, and there is a possibility that the lined coating will peel off.

[0008] Therefore, the present invention has been made in view of the above circumstances, and aims to provide a method for applying a rehabilitation material that improves the watertightness from the flange portion of the branch pipe to the branch portion of the main pipe at the other end, and that allows for the integrated rehabilitation of the branch portion of the main pipe and the branch pipe in a short period of time. [Means for solving the problem]

[0009] In other words, in order to solve the above problems of the present invention, the method for installing a rehabilitation material is a method for installing a rehabilitation material that covers and rehabilitates the inner circumferential surface of an existing pipe including the branch portion between a main pipe and a branch pipe, comprising: a main pipe rehabilitation step of installing the main pipe rehabilitation material along the inner circumferential surface of the main pipe including the branch portion; a drilling step of drilling a through hole in the main pipe rehabilitation material at the branch portion; and a branch pipe rehabilitation step of installing the branch pipe rehabilitation material along the inner circumferential surface of the branch pipe, wherein the branch pipe has a flange portion at the end opposite to the branch portion, and the branch pipe rehabilitation step integrally rehabilitates from the surface of the flange portion to the through hole. [Effects of the Invention]

[0010] According to the present invention, the watertightness from the flange portion of the branch pipe to the branch portion of the main pipe at the other end is improved, and the rehabilitation of the branch portion of the main pipe and the branch pipe can be carried out integrally in a short period of time. [Brief explanation of the drawing]

[0011] [Figure 1] This is an explanatory diagram showing the branching point of a water pipe where the main pipe and the branch pipe are connected. [Figure 2]This is a flowchart showing the application method (first application method) of the rehabilitation material according to the first embodiment. [Figure 3] This is an explanatory diagram showing an example of installing main pipe rehabilitation material on the inner surface of the main pipe in step S001. [Figure 4] Figure 3 is an explanatory diagram showing the state in which the main pipe rehabilitation material has been installed on the inner surface of the main pipe using the method of installing the main pipe rehabilitation material shown. [Figure 5] This is an explanatory diagram showing the process of drilling through holes in the main pipe rehabilitation material at the branching section of the main pipe. [Figure 6] This is an explanatory diagram showing that a pressure vessel with an expansion bag has been installed at the flange portion of a branch pipe. [Figure 7] This is an explanatory diagram illustrating an example of the integrated rehabilitation of a branch pipe from the flange to the through hole. [Figure 8] Figure 7 is an explanatory diagram showing the state in which branch pipe rehabilitation material has been installed on the inner surface of a branch pipe using the method of installing branch pipe rehabilitation material shown in Figure 7. [Figure 9] This is an explanatory diagram showing the state after the branch pipe rehabilitation process has been carried out, with branch pipe 6 connected to branch pipe 2. [Figure 10] This is a flowchart showing the application method (second application method) of the rehabilitation material according to the second embodiment. [Figure 11] This is a flowchart showing the application method of the rehabilitation material according to the third embodiment (third application method). [Figure 12] This is an explanatory diagram showing an example of installing partial repair material on the inner surface of the branching section in step S101. [Figure 13] Figure 12 is an explanatory diagram showing the state in which partial repair material has been installed on the inner surface of the branch section using the method of installing partial repair material shown. [Figure 14] This is an explanatory diagram showing the state after the branch pipe rehabilitation process (step S005) has been completed and branch pipe 6 has been connected to branch pipe 2. [Figure 15] This is a flowchart showing the method for applying the rehabilitation material according to the fourth embodiment (the fourth application method). [Figure 16]It is an explanatory view showing a state in which a branch pipe regenerative material is installed on the inner peripheral surface of a branch pipe by the method of installing the branch pipe regenerative material shown in FIG. 7. [Figure 17] It is an explanatory view showing a state in which a branch pipe 6 is connected to a branch pipe 2 in a branch portion constructed by the construction method of the regenerative material according to the fourth embodiment. [Figure 18] It is an explanatory view showing a state in which resin is filled in the roundness of the branch portion before drilling a through hole in the main pipe regenerative material. [Figure 19] It is an explanatory view showing a comparative example as a conventional technique.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments for carrying out the present invention will be described in detail. Note that the embodiments described below are examples for realizing the present invention, and should be appropriately modified or changed according to the configuration of the apparatus to which the present invention is applied and various conditions. The present invention is not limited to the following embodiments. In each figure, the same components are denoted by the same reference numerals, and redundant explanations are omitted as appropriate.

[0013] <Comparative Example> FIG. 19 is an explanatory view showing a comparative example as a conventional technique. In the comparative example of FIG. 19, a branch portion 10P that connects the main pipe 1 and the branch pipe 2 is shown.

[0014] As shown in FIG. 19, the existing pipe 3 includes a main pipe 1 extending in the horizontal direction and a branch pipe 2 branching from the main pipe 1. The existing pipe 3 is a pressure pipe, for example, a water pipe laid underground. The main pipe 1 has a larger diameter than the branch pipe 2. The branch pipe 2 forms a flow path for distributing fluid (water) from the main pipe 1 to above-ground facilities and the like. Thus, a branch portion 10P is formed at the portion where the main pipe 1 and the branch pipe 2 are connected.

[0015] The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10P. Bolt holes 4 are formed in the flange portion 5.

[0016] In the comparative example in Figure 19, repair material 31P is installed on the inner surface near the branch section 10P of the existing pipe 3. Specifically, the inner surface near the branch section 10P of the main pipe 1, the inner surface near the branch section 10P of the branch pipe 2, and the main pipe 1 are continuously covered with repair material 31P, including the branch section 10P. The repair material 31P contains, for example, a thermosetting resin or a photocuring resin and covers the inner surface of the branch section 10P.

[0017] Here, the comparative example shown in Figure 19 is an example of applying a repair method for repairing a branch section 10P in a sewer system to a water pipe. Reference numeral 99 indicates the joint (end of the repair material 31P) on the inner circumferential surface of the branch pipe 2 that is covered by the repair material 31P. As a result, as shown in Figure 19, the branch pipe 2 has a portion where the inner circumferential surface of the branch pipe 2 is exposed and a portion where the inner circumferential surface of the branch pipe 2 is covered by the repair material 31P.

[0018] In conventional sewer construction methods, as shown in Figure 19, the repair material 31P is applied so that joints 99 are positioned on the inner surface of the branch pipe 2. Since the water pressure inside the branch pipe 2 is not high, rehabilitation is possible even with repairs using such repair material 31P.

[0019] However, in the case of internally pressurized pipes such as water pipes, it is expected that water will enter through the joint 99 between the branch pipe 2 and the repair material 31P due to the high water pressure. If water enters behind the repair material 31P through the joint 99, the repair material 31P will be more likely to peel off from the branch pipe 2. Therefore, it is difficult to directly apply the repair methods used for branch sections in conventional sewage systems to internally pressurized pipes such as water pipes.

[0020] Therefore, in this embodiment, in the branch pipe rehabilitation process, the watertightness from the flange portion 5 of the branch pipe 2 to the branch portion 10 of the main pipe 1 is improved by rehabilitating the entire section from the surface of the flange portion 5 of the branch pipe 2 to the through hole 22 of the main pipe 1. In this embodiment, when the entire section from the surface of the flange portion 5 of the branch pipe 2 to the through hole 22 of the main pipe 1 is rehabilitated integrally, the entire section including the flange portion 5 of the branch pipe 2 to the branch portion 10 of the main pipe 1 can be rehabilitated integrally.

[0021] Furthermore, in this embodiment, since the rehabilitation of the branch pipe 2 and the main pipe 1 can be carried out simultaneously without replacing the branch pipe 2 through construction work, it is possible to provide a method for applying rehabilitation material that allows the rehabilitation of the branch portion 10 of the main pipe 1 and branch pipe 2 to be carried out in a shorter period of time than conventional methods.

[0022] <First Embodiment> In this embodiment, for example, in the branch section of a water pipe buried underground, the repair of the branch section between the existing main pipe and the branch pipe is carried out as a single integrated repair. In particular, this embodiment is a construction method that not only covers the inner surface of the main pipe but also covers the inner surface of the branch pipe, thereby rehabilitating the branch section as a whole. Below, the construction method for a water pipe, which is an example of an internal pressure pipe, will be explained, first describing the structure of the branch section, and then referring to the flowchart.

[0023] [Structure of the branching section] Figure 1 is an explanatory diagram showing the branch section of a water pipe where the main pipe and the branch pipe are connected. As shown in Figure 1, the existing pipe 3 comprises a main pipe 1 extending horizontally and a branch pipe 2 branching off from the main pipe 1. The existing pipe 3 is a pressurized pipe, such as a water pipe laid underground. The main pipe 1 has a larger diameter than the branch pipe 2. The branch pipe 2 forms a flow path for distributing fluid (water) from the main pipe 1 to above-ground facilities, etc. A branch section 10 is formed where the main pipe 1 and the branch pipe 2 are connected. Since the branch section 10 is also the part that connects the main pipe 1 and the branch pipe 2, in this specification, the branch section 10 is also referred to as the connection section.

[0024] Thus, the branch section 10 is formed by connecting the main pipe 1 and the branch pipe 2. The branch pipe 2 also has a flange portion 5 at the end opposite to the branch section 10. Bolt holes 4 are formed in the flange portion 5.

[0025] [Application Method for Rehabilitation Material (First Application Method)] Figure 2 is a flowchart showing the application method of the rehabilitation material according to the first embodiment (first application method).

[0026] As shown in Figure 2, the method for constructing the rehabilitation material according to the first embodiment involves constructing a main pipe rehabilitation process (step S001), a through-hole drilling process (step S003), and a branch pipe rehabilitation process (step S005).

[0027] Specifically, in the main pipe rehabilitation process shown in step S001, the main pipe rehabilitation material 21 is installed along the inner circumferential surface of the main pipe 1, including the branch section 10.

[0028] Figure 3 is an explanatory diagram showing an example of installing main pipe rehabilitation material on the inner surface of the main pipe in step S001.

[0029] As shown in Figure 3, in this embodiment, the main pipe rehabilitation material 21 is attached to the outside of the expansion bag 20 (at a position facing the inner circumferential surface of the main pipe 1), and the main pipe rehabilitation material 21 is covered on the inner circumferential surface of the main pipe 1 by inflating the expansion bag 20 in the direction S. In this case, for example, the main pipe rehabilitation material 21 is covered on the inner circumferential surface of the main pipe 1 by inserting the expansion bag 20 inverted along the direction S from the main pipe 1 on the right to the branch pipe 2 on the left.

[0030] The main pipe rehabilitation material 21 is composed of a material including, for example, a thermosetting resin. The main pipe rehabilitation material 21 is installed by a curing process. The installation of the main pipe rehabilitation material 21 is carried out, for example, by heating and circulating the water inverted from the main pipe rehabilitation material 21 using a hot water boiler. The temperature of the heated circulating water is, for example, 70°C to 75°C, and it is heated and cured for 90 minutes. After that, the temperature is raised, and it is heated and cured for 30 minutes with hot water return at 85°C or higher. Note that the temperature of the heated circulating water and the heating time are examples and are not limited to these.

[0031] Figure 4 is an explanatory diagram showing the state in which the main pipe rehabilitation material has been installed on the inner surface of the main pipe using the method of installing the main pipe rehabilitation material shown in Figure 3.

[0032] As shown in Figure 4, the main pipe rehabilitation material 21 is installed around the entire circumference of the inner surface of the main pipe 1. In step S001, the inversion method, in which the expansion bag 20 is inverted and inserted, was used for the explanation, but the method is not limited to this. For example, the main pipe rehabilitation process in step S001 may be a known forming method or lining method. In addition, if there is water leakage in the existing pipe 3 or in areas where the pressure of the infiltrating water is high, a preliner (cylindrical reinforcing sheet) may be used.

[0033] Furthermore, although the main pipe rehabilitation material 21 was described using a material containing a thermosetting resin, it is not limited to this. For example, the main pipe rehabilitation material 21 may be composed of a material containing a photocurable resin, as described later. Alternatively, the main pipe rehabilitation material 21 may be a thermoplastic resin.

[0034] Furthermore, the main pipe rehabilitation material 21 is composed of, for example, a nonwoven fabric of polyester fibers and an unsaturated polyester resin (for example, epoxy resin) as a lining material. The main pipe rehabilitation material 21 can be arbitrarily selected considering, for example, the degree of deterioration and damage of the existing pipe 3, the impact on flow capacity, odor countermeasures for residents, and the site environment.

[0035] Returning to Figure 2, we continue the explanation. In the through-hole drilling process shown in step S003, a through-hole 22 is drilled in the main pipe rehabilitation material 21 at the branching section 10.

[0036] Figure 5 is an explanatory diagram showing the process of drilling through holes in the main pipe rehabilitation material at the branching section of the main pipe.

[0037] As shown in Figure 5, a through-hole 22 is formed in the branch section 10 of the main pipe 1 by drilling through the main pipe rehabilitation material 21. The through-hole 22 is constructed, for example, by inserting a cutting tool from the end opening on the flange section 5 side of the branch pipe 2.

[0038] Returning to Figure 2, we continue the explanation. In the branch pipe rehabilitation process shown in step S005, the branch pipe rehabilitation material 23 is installed along the inner circumferential surface of the branch pipe 2. The branch pipe rehabilitation process in this embodiment is characterized by the integral rehabilitation of the section from the surface of the flange portion 5 to the through hole 22.

[0039] Figure 6 is an explanatory diagram showing that a pressure vessel with an expansion bag is installed at the flange portion of the branch pipe.

[0040] As shown in Figure 6, a pressure vessel (inverter) 27 is installed on the flange portion 5 of the branch pipe 2. The pressure vessel 27 is equipped with an expansion bag 24 having a branch pipe rehabilitation material 23 on its inner surface. The end of the expansion bag 24 is attached to the upper surface of the flange portion 5. The pressure vessel 27 fixes the end of the expansion bag 24 to the upper surface of the flange portion 5 with the end of the expansion bag 24 forming an annular shape around the nozzle of the pressure vessel 27.

[0041] The pressure vessel 27 supplies compressed air R to its interior, which acts air pressure on the expansion bag 24, pushing the branch pipe rehabilitation material 23, which is provided on the inner surface of the expansion bag 24, to the inner surface of the branch pipe 2. The branch pipe rehabilitation material 23 is made of, for example, a thermosetting resin or a photocurable resin. A photocurable resin is a resin that hardens when irradiated with light (ultraviolet light).

[0042] Figure 7 is an explanatory diagram showing an example of the integrated rehabilitation of a branch pipe from the flange to the through hole.

[0043] As shown in Figure 7, in this embodiment, the branch pipe rehabilitation material 23 is attached to the outside of the expansion bag 24 (at a position facing the inner circumferential surface of the branch pipe 2), and the expansion bag 24 is inflated in direction T by the pressure vessel 27, thereby covering the inner circumferential surface of the branch pipe 2 with the branch pipe rehabilitation material 23. In this case, for example, the branch pipe rehabilitation material 23 covers the inner circumferential surface of the branch pipe 2 by inverting and inserting the expansion bag 24 along the vertically downward direction T from the upper branch pipe 2.

[0044] Figure 8 is an explanatory diagram showing the state in which branch pipe rehabilitation material has been installed on the inner surface of a branch pipe using the method of installing branch pipe rehabilitation material shown in Figure 7.

[0045] As shown in Figure 8, the branch pipe rehabilitation material 23 is evenly applied to the inner circumferential surface of the branch pipe 2 by the expansion bag 24. The branch pipe rehabilitation material 23 is not limited to either a thermosetting resin or a photocuring resin, and is not particularly limited as long as it can rehabilitate the entire area from the surface of the flange portion 5 of the branch pipe 2 to the through hole 22.

[0046] Furthermore, although the branch pipe rehabilitation process shown in step S005, illustrated in Figures 6 to 8, was described using an inversion method in which the expansion bag 24 is inverted and inserted, the method is not limited to this. For example, the branch pipe rehabilitation process in step S005 may be carried out using a known forming method. Here, a known forming method is, for example, a method in which branch pipe rehabilitation material 23 is drawn into the branch pipe 2 from the flange portion 5 of the branch pipe 2 toward the branch portion 10 of the main pipe 1. Then, the branch pipe rehabilitation material 23 is heated and pressurized inside the branch pipe 2 to harden the resin contained in the branch pipe rehabilitation material 23 and construct a new pipe. The hardening method may include hot water, steam, or light.

[0047] Furthermore, the corner formed at the connection point between the main pipe 1 and the branch pipe 2 may be tapered (arc-shaped). In this case, an annular recess is formed between this tapered corner and the periphery of the through-hole in the main pipe rehabilitation material 21. The branch pipe rehabilitation material 23 also fits into this annular recess. As a result, the contact area between the main pipe rehabilitation material 21 and the branch pipe rehabilitation material 23 is increased, and the two are more firmly integrated.

[0048] Furthermore, the corner formed at the branching portion 10 of the main pipe 1 and the branching portion 2 is integrated by covering both the branching portion 10 of the main pipe 1 and the branching portion 10 of the branching pipe 2 with the branching pipe rehabilitation material 23. Therefore, the branching pipe rehabilitation material 23 integrates the main pipe 1 and the branching pipe 2 by covering at least the branching portion 10 of the main pipe 1 and the inner circumferential surface of the branching pipe 2.

[0049] Furthermore, as shown in Figure 8, if the flange portion 5 of the branch pipe 2 is located outside the pipeline, the expansion bag 24 will also place the branch pipe rehabilitation material 23 on the flange portion 5. For example, when light is irradiated from the outside, the photocurable resin will set the branch pipe rehabilitation material 23 on the flange portion 5.

[0050] The branch section 10 is completed when the main pipe rehabilitation material 21 and branch pipe rehabilitation material 23 are installed through the main pipe rehabilitation process (step S001) shown in Figures 3 and 4, the through hole drilling process (step S003) shown in Figure 5, and the branch pipe rehabilitation process (step S005) shown in Figures 6 to 8, as shown in the flowchart in Figure 2.

[0051] Thus, in the branch section 10 shown in Figure 8, the main pipe rehabilitation material 21 is installed on the inner surface of the main pipe 1, and the branch pipe rehabilitation material 23 is installed on the inner surface of the branch pipe 2, thereby completing the installation method of the rehabilitation material.

[0052] Figure 9 is an explanatory diagram showing the state after the branch pipe rehabilitation process (step S005) has been completed and branch pipe 6 has been connected to branch pipe 2.

[0053] As shown in Figure 9, in the first embodiment, bolts 7 are provided on the flange portions 5 of the branch pipe 6 and branch pipe 2, and nuts 8 are attached to the bolt holes 4 of the branch pipe 2. In addition, an O-ring 25 and a packing 26 are inserted between the branch pipe 6 and branch pipe 2.

[0054] As described above, the method for applying the rehabilitation material according to this embodiment (first method of application) is a method for applying the rehabilitation material to rehabilitate the inner circumferential surface of an existing pipe 3, including the branch portion 10 between the main pipe 1 and the branch pipe 2, and comprises a main pipe rehabilitation process (step S001), a through-hole drilling process (step S003), and a branch pipe rehabilitation process (step S005). The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10. As a result, in the branch pipe rehabilitation process (step S005), the area from the surface of the flange portion 5 to the through-hole 22 is rehabilitated integrally.

[0055] In the method for applying the rehabilitation material according to this embodiment, since it includes a branch pipe rehabilitation step (step S005), the entire area from the surface of the flange portion 5 to the through hole 22 can be rehabilitated integrally.

[0056] As a result, the method for applying the rehabilitation material according to this embodiment solves the problems shown in the comparative example in Figure 19 and prevents water from leaking through the gap between the repair material 31P and the branch pipe 2, thereby preventing water from entering the back side of the repair material 31P. Furthermore, the method for applying the rehabilitation material according to this embodiment allows for the rehabilitation of both the branch pipe 2 and the main pipe 1 simultaneously without replacing the branch pipe 2 through construction work. This improves the watertightness from the flange portion 5 of the branch pipe 2 to the branch portion 10 of the main pipe 1 at the other end, and allows for the integrated rehabilitation of the main pipe 1 and the branch portion 10 of the branch pipe 2 in a short period of time.

[0057] <Second Embodiment> [Application method for rehabilitation material (Second application method)] The method for applying the rehabilitation material according to the second embodiment is a method in which the order of application of the rehabilitation material is reversed compared to the first embodiment, and is a modified example of the method for applying the rehabilitation material according to the first embodiment.

[0058] In the method for applying the rehabilitation material according to the second embodiment, the rehabilitation material is applied in the following order: branch pipe rehabilitation process (step S005), main pipe rehabilitation process (step S001), and through hole drilling process (step S003).

[0059] In other words, the method for applying the rehabilitation material according to the second embodiment is a method for applying the rehabilitation material to rehabilitate the inner circumferential surface of an existing pipe 3, including the branch portion 10 between the main pipe 1 and the branch pipe 2, and comprises: a branch pipe rehabilitation step (step S005) in which a branch pipe rehabilitation material 23 is installed along the inner circumferential surface of the branch pipe 2; a main pipe rehabilitation step (step S001) in which a main pipe rehabilitation material 21 is installed along the inner circumferential surface of the main pipe 1, including the branch portion 10; and a through-hole drilling step (step S003) in which a through-hole 22 is drilled in the main pipe rehabilitation material 21 at the branch portion 10. The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10. As a result, in the branch pipe rehabilitation step (step S005), the area from the surface of the flange portion 5 to the branch portion 10 is rehabilitated integrally.

[0060] Figure 10 is a flowchart showing the method of applying the rehabilitation material according to the second embodiment (second application method).

[0061] The flowchart of the rehabilitation material application method according to the second embodiment shown in Figure 10 differs from the flowchart of the rehabilitation material application method according to the first embodiment shown in Figure 2 in that the branch pipe rehabilitation process (step S005) is swapped with the main pipe rehabilitation process (step S001). In other words, in the second application method, the branch pipe rehabilitation process (step S005) is performed first.

[0062] As shown in Figure 10, even if the branch pipe rehabilitation process (step S005) is replaced with the main pipe rehabilitation process (step S001), the method of applying the rehabilitation material according to the second embodiment can be applied in the same way as the method of applying the rehabilitation material according to the first embodiment. In this case, since the through hole 22 has not yet been opened in the branch pipe rehabilitation process (step S005), the rehabilitation is performed up to the branch section 10.

[0063] As described above, the method for applying the rehabilitation material according to the second embodiment (second application method) includes a branch pipe rehabilitation process (step S005), a main pipe rehabilitation process (step S001), and a through-hole drilling process (step S003). The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10. As a result, in the branch pipe rehabilitation process (step S005), the area from the surface of the flange portion 5 to the branch portion 10 is rehabilitated integrally.

[0064] With this configuration, the method for applying the rehabilitation material according to the second embodiment is the same as the first method, except that the main pipe rehabilitation process (step S001) and the branch pipe rehabilitation process (step S005) are swapped. Therefore, similar to the first embodiment, the branch pipe rehabilitation process (step S005) allows for the integral rehabilitation of the area from the surface of the flange portion 5 to the branch portion 10.

[0065] As a result, the method for applying the rehabilitation material according to the second embodiment improves the watertightness from the flange portion 5 of the branch pipe 2 to the branch portion 10 of the main pipe 1 at the other end, similar to the method for applying the rehabilitation material according to the first embodiment, and allows for the rehabilitation of the main pipe 1 and the branch portion 10 of the branch pipe 2 in a short period of time.

[0066] <Third Embodiment> [Application Method for Rehabilitation Material (Third Application Method)] The method for applying the rehabilitation material according to the third embodiment is a method in which a partial repair step is added first to the application sequence of the first application method.

[0067] In other words, the method for applying the rehabilitation material according to the third embodiment is a method for applying the rehabilitation material to cover and rehabilitate the inner circumferential surface of an existing pipe 3 including the branch portion 10 between the main pipe 1 and the branch pipe 2, and comprises: a partial repair step (step S101) in which partial repair material is installed from the inner circumferential surface of the branch pipe 2 to the inner circumferential surface of the main pipe 1 including the branch portion 10; a main pipe rehabilitation step (step S001) in which main pipe rehabilitation material 21 is installed along the inner circumferential surface of the main pipe 1 including the branch portion 10; a through-hole drilling step (step S003) in which through-holes 22 are drilled in the main pipe rehabilitation material 21 at the branch portion 10; and a branch pipe rehabilitation step (step S005) in which branch pipe rehabilitation material 23 is installed along the inner circumferential surface of the branch pipe 2. The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10, similar to the first embodiment. As a result, in the branch pipe rehabilitation process (step S005), the area from the surface of the flange portion 5 to the through hole 22 is rehabilitated integrally.

[0068] Thus, the method for applying the rehabilitation material according to the third embodiment is characterized in that a partial repair step (step S101) is performed at the beginning of the method for applying the rehabilitation material according to the first embodiment.

[0069] Figure 11 is a flowchart showing the construction method of the rehabilitation material according to the third embodiment (third construction method).

[0070] As shown in Figure 11, the method for applying the rehabilitation material according to the third embodiment involves performing a partial repair process (step S101), a main pipe rehabilitation process (step S001), a through-hole drilling process (step S003), and a branch pipe rehabilitation process (step S005).

[0071] Specifically, in the partial repair process shown in step S101, the partial repair material 31 is installed from the inner surface of the branch pipe 2 to the inner surface of the main pipe 1, including the branch portion 10.

[0072] Figure 12 is an explanatory diagram showing an example of installing partial repair material on the inner circumferential surface of the branching section in step S101.

[0073] As shown in Figure 12, in the third embodiment, the partial repair material 31 is attached to the outside of the inflation bag 30 (at a position facing the inner circumferential surface of the branching portion 10), and the partial repair material 31 is covered on the inner circumferential surface of the branching portion 10 by inflating the inflation bag 30 in all directions, including direction U.

[0074] Figure 13 is an explanatory diagram showing the state in which partial repair material has been installed on the inner surface of the branch section using the method of installing partial repair material shown in Figure 12.

[0075] As shown in Figure 13, a partial repair material 31 is installed around the entire circumference of the inner surface of the branch section 10 of the main pipe 1 and the branch pipe 2. The partial repair material 31 can be made of thermosetting resin or photocuring resin, and is not limited to these.

[0076] Returning to Figure 11, we continue the explanation. When the partial repair process of step S101 is carried out, the flowchart in Figure 11 is completed by carrying out the same construction as the construction method of the rehabilitation material in the first embodiment, namely the main pipe rehabilitation process (step S001), the through hole drilling process (step S003), and the branch pipe rehabilitation process (step S005).

[0077] Figure 14 is an explanatory diagram showing the state after the branch pipe rehabilitation process (step S005) has been completed and branch pipe 6 has been connected to branch pipe 2.

[0078] As shown in Figure 14, in the third embodiment, similar to Figure 9 of the first embodiment, bolts 7 are provided on the flange portions 5 of the branch pipe 6 and branch pipe 2, and nuts 8 are attached to the bolt holes 4 of the branch pipe 2. In addition, an O-ring 25 and a packing 26 are inserted between the branch pipe 6 and branch pipe 2.

[0079] As described above, the method for applying the rehabilitation material according to the third embodiment (third application method) includes a partial repair step (step S101), a main pipe rehabilitation step (step S001), a through-hole drilling step (step S003), and a branch pipe rehabilitation step (step S005). The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10. As a result, in the branch pipe rehabilitation step (step S005), the area from the surface of the flange portion 5 to the through-hole 22 is rehabilitated integrally.

[0080] According to this configuration, in the method for applying the rehabilitation material according to the third embodiment, compared to the first method, a partial repair step (step S101) is performed first to install the partial repair material 31 from the inner surface of the branch pipe 2 to the inner surface of the main pipe 1, including the branch portion 10. Thereafter, the first method is performed, and finally, the branch pipe rehabilitation step (step S005) is performed to integrally rehabilitate the inner surface of the branch pipe 2 with the branch pipe rehabilitation material 23 from the surface of the flange portion 5 to the through hole 22.

[0081] Thus, in the method of applying the rehabilitation material according to the third embodiment, for example, as shown in Figure 13, the branch section 10 is repaired with the partial repair material 31, and then the main pipe 1 and the branch pipe 2 are rehabilitated integrally, similar to the first method of application. In this case, as shown in Figure 14, the branch pipe rehabilitation material 23 can prevent water from entering through the gap between the branch pipe 2 and the partial repair material 31. In addition, the main pipe rehabilitation material 21 can prevent water from entering through the gap between the main pipe 1 and the partial repair material 31.

[0082] As a result, the method for constructing the rehabilitation material according to the third embodiment can further improve watertightness and enhance durability against water pressure.

[0083] <Fourth Embodiment> [Application Method for Rehabilitation Material (Fourth Application Method)] The method for applying the rehabilitation material according to the fourth embodiment is a method in which the order of application of the rehabilitation material is reversed compared to the third embodiment, and is a modified version of the method for applying the rehabilitation material according to the third embodiment. In other words, it is a method in which the partial repair process (step S101) is performed at the beginning of the second embodiment.

[0084] In the method for applying the rehabilitation material according to the fourth embodiment, first, a partial repair process (step S101) is performed, and then the rehabilitation material is applied in the following order: branch pipe rehabilitation process (step S005), main pipe rehabilitation process (step S001), and through hole drilling process (step S003).

[0085] In other words, the method for applying the rehabilitation material according to the fourth embodiment is a method for applying the rehabilitation material to cover and rehabilitate the inner circumferential surface of an existing pipe 3 including the branch portion 10 between the main pipe 1 and the branch pipe 2, and comprises: a partial repair step (step S101) in which a partial repair material 31 is installed from the inner circumferential surface of the branch pipe 2 to the inner circumferential surface of the main pipe 1 including the branch portion 10; a branch pipe rehabilitation step (step S005) in which a branch pipe rehabilitation material 23 is installed along the inner circumferential surface of the branch pipe 2; a main pipe rehabilitation step (step S001) in which a main pipe rehabilitation material 21 is installed along the inner circumferential surface of the main pipe 1 including the branch portion 10; and a through-hole drilling step (step S003) in which a through-hole 22 is drilled in the main pipe rehabilitation material 21 at the branch portion 10. The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10. As a result, in the branch pipe rehabilitation process (step S005), the entire section from the surface of the flange portion 5 to the branch portion 10 (connection portion) is rehabilitated as a single unit.

[0086] Figure 15 is a flowchart showing the construction method of the rehabilitation material according to the fourth embodiment (fourth construction method).

[0087] The flowchart of the rehabilitation material application method according to the fourth embodiment shown in Figure 15 differs from the flowchart of the rehabilitation material application method according to the third embodiment shown in Figure 11 in that, after first performing the partial repair process (step S101), the main pipe rehabilitation process (step S001) and the branch pipe rehabilitation process (step S005) are swapped compared to the third application method.

[0088] As shown in Figure 15, even if the main pipe rehabilitation process (step S001) and the branch pipe rehabilitation process (step S005) are swapped, the method of applying the rehabilitation material according to the fourth embodiment can be applied in the same way as the method of applying the rehabilitation material according to the third embodiment. That is, in the fourth application method, the watertightness of the branch section 10 can be further improved by performing the partial repair process (step S101) at the beginning of the method of applying the rehabilitation material according to the second embodiment.

[0089] As described above, the method for applying the rehabilitation material according to the fourth embodiment (the fourth application method) includes a partial repair process (step S101), a branch pipe rehabilitation process (step S005), a main pipe rehabilitation process (step S001), and a through-hole drilling process (step S003). The branch pipe 2 has a flange portion 5 at the end opposite to the branch portion 10. As a result, in the branch pipe rehabilitation process (step S005), the area from the surface of the flange portion 5 to the branch portion 10 is rehabilitated integrally.

[0090] According to this configuration, the method for applying the rehabilitation material according to the fourth embodiment first performs the partial repair step (step S101) of the third method. Thereafter, the main pipe rehabilitation step (step S001) and the branch pipe rehabilitation step (step S005) are swapped compared to the third method. In other words, the method for applying the rehabilitation material according to the fourth embodiment performs the second method (the method for applying the rehabilitation material according to the second embodiment) after the partial repair step (step S101), thereby integrally rehabilitating the area from the surface of the flange portion 5 to the branch portion 10 by the branch pipe rehabilitation step (step S005).

[0091] Thus, the method for applying the rehabilitation material according to the fourth embodiment, similar to the method for applying the rehabilitation material according to the third embodiment, allows for the main pipe 1 and the branch pipe 2 to be integrally rehabilitated by applying the rehabilitation material method according to the second embodiment after repairing the branch section 10 with the partial repair material 31.

[0092] As a result, the method for applying the rehabilitation material according to the fourth embodiment can further improve watertightness and durability against water pressure, similar to the method for applying the rehabilitation material according to the third embodiment.

[0093] Furthermore, in the case of the method for installing the rehabilitation material according to the fourth embodiment, when installing the branch pipe rehabilitation material 23, the branch pipe rehabilitation material 23 can be installed so as to block the space between the branch pipe 2 and the partial repair material 31.

[0094] Figure 16 is an explanatory diagram showing the state in which branch pipe rehabilitation material has been installed on the inner surface of a branch pipe using the method of installing branch pipe rehabilitation material shown in Figure 7.

[0095] As shown in Figure 16, branch pipe rehabilitation material 23 is installed on the inner surface of the branch pipe 2, but the branch pipe rehabilitation material 23 only needs to cover at least a portion of the partial repair material 31. If the branch pipe rehabilitation material 23 covers the portion of the branch pipe 2 that overlaps with the partial repair material 31, watertightness can be improved and construction time can be shortened.

[0096] In other words, in the method of applying the rehabilitation material according to the fourth embodiment, when the branch pipe rehabilitation process (step S005) integrally rehabilitates the area from the surface of the flange portion 5 to the branch portion 10, the partial repair material 31 is installed on the branch portion 10. Therefore, since the branch portion 10 has already been treated with the partial repair material 31, the branch pipe rehabilitation material 23 does not need to cover the entire branch portion 10. Thus, the branch pipe rehabilitation material 23 only needs to cover the joint between the branch pipe 2 and the partial repair material 31 and reach a predetermined area of ​​the branch portion 10 that connects to the main pipe 1.

[0097] Figure 17 is an explanatory diagram showing the state in which branch pipe 6 is connected to branch pipe 2 in a branch section constructed by the rehabilitation material construction method according to the fourth embodiment.

[0098] As shown in Figure 17, in the fourth embodiment, similar to Figure 14 of the third embodiment, bolts 7 are provided on the flange portions 5 of the branch pipe 6 and branch pipe 2, and nuts 8 are attached to the bolt holes 4 of the branch pipe 2. In addition, an O-ring 25 and a packing 26 are inserted between the branch pipe 6 and branch pipe 2.

[0099] In this case, the method for installing the rehabilitation material according to the fourth embodiment, like the method for installing the rehabilitation material according to the third embodiment, can prevent water from entering through the gap between the branch pipe 2 and the partial repair material 31, thereby improving watertightness and durability against water pressure. Furthermore, since the method for installing the rehabilitation material according to the fourth embodiment requires less installation area for the branch pipe rehabilitation material 23 than the method for installing the rehabilitation material according to the third embodiment, the installation time can be shortened.

[0100] Furthermore, in the method for installing the rehabilitation material according to the fourth embodiment, after the through-hole drilling process (step S003), the main pipe rehabilitation material 21 around the through-hole 22 may be chamfered as desired. This prevents water from leaking between the main pipe rehabilitation material 21 and the partial repair material 31 in the method for installing the rehabilitation material according to the fourth embodiment.

[0101] Furthermore, in the construction method of the rehabilitation material according to the first to fourth embodiments, the existing pipe 3 may be an internal pressure pipe.

[0102] With this configuration, the rehabilitation material application method according to the first to fourth embodiments can be applied to, for example, a water supply system as an example of an internal pressure pipe. Unlike conventional sewer repair methods, the rehabilitation material application method according to the first to fourth embodiments rehabilitates the branch pipe 2 integrally from the surface of the flange portion 5 to the through hole 22 (or branch portion 10) along the inner circumferential surface of the branch pipe 2.

[0103] As a result, the construction method of the rehabilitation material according to the first to fourth embodiments resolves the problems shown in the comparative example in Figure 19 and prevents water from leaking through the gap between the repair material 31P and the branch pipe 2, thereby preventing water from entering behind the repair material 31P. This makes it possible to improve the watertightness of the branch section 10, unlike conventional sewer repair methods.

[0104] <Variation> For example, as shown in Figure 1 or Figure 4, in the method of applying the rehabilitation material according to the first embodiment, a rounded shape (so-called corner radius) is formed at the connection point between the main pipe 1 and the branch pipe 2 of the branch section 10. Air tends to remain in the rounded shape of the branch section 10, and in the branch pipe rehabilitation process of step S005, when the branch pipe rehabilitation material 23 is applied to the inner circumferential surface of the branch pipe 2, air (bubbles) may be mixed in between the branch pipe 2 and the branch pipe rehabilitation material 23.

[0105] Therefore, in the through-hole drilling process shown in step S003 of Figure 2, resin 32 may be filled into the rounded part of the branch section 10 before drilling the through-hole 22 in the main pipe rehabilitation material 21.

[0106] Figure 18 is an explanatory diagram showing the state in which resin has been filled into the rounded section of the branch before through holes are drilled in the main pipe rehabilitation material.

[0107] As shown in Figure 18, in the modified example, a resin 32 with a thickness approximately the same as the thickness of the main pipe 1 is filled on top of the main pipe rehabilitation material 21 in the branch section 10. By filling the main pipe rehabilitation material 21 in the branch section 10 with resin 32, it is possible to avoid air remaining in the rounded shape M of the branch section 10 when performing the branch pipe rehabilitation process in step S005.

[0108] Therefore, in the modified example, with resin 32 filled onto the main pipe rehabilitation material 21 including the rounded M of the branch section 10, a through hole 22 is drilled into the main pipe rehabilitation material 21 by the through hole drilling process shown in step S003 of Figure 2. As a result, in the modified example, residual air in the rounded M of the branch section 10 can be removed, so even if the branch pipe rehabilitation process shown in step S005 of Figure 2 is performed, the mixing of air into the branch pipe rehabilitation material 23 shown in Figure 8 can be avoided, and the branch pipe rehabilitation material 23 can be strengthened.

[0109] Furthermore, the first to fourth construction methods described above can all be flexibly selected and applied depending on the deterioration and aging of the existing pipes 3 at the construction site. [Explanation of Symbols]

[0110] 1 Main pipe 2 branch pipes 3 Existing pipes 4 bolt holes 5. Flange section 6 Branch pipes 7 volts 8 nuts 10. Branching section (connection section) 20, 24, 30 Inflatable bags 21 Main pipe rehabilitation material 22 Through hole 23 Branch pipe rehabilitation material 25 O-rings 26 Packing 27. Pressure vessel (inverter) 31 Partial repair material 32 resin 99 seams

Claims

1. A method for applying a rehabilitation material to rehabilitate an existing pipe, including the branching portion between the main pipe and the branch pipe, by covering the inner surface of the pipe. A main pipe rehabilitation process in which a main pipe rehabilitation material is installed along the inner circumferential surface of the main pipe including the branch portion, The process involves drilling through holes in the main pipe rehabilitation material at the aforementioned branching section, The process includes installing a branch pipe rehabilitation material along the inner surface of the branch pipe, The branch pipe has a flange portion at the end opposite to the branch portion, The branch pipe rehabilitation process involves rehabilitating the entire section from the surface of the flange to the through hole. A method for applying rehabilitation material characterized by the following.

2. A method for applying a rehabilitation material to rehabilitate an existing pipe, including the branching portion between the main pipe and the branch pipe, by covering the inner surface of the pipe. A branch pipe rehabilitation process involves installing a branch pipe rehabilitation material along the inner circumferential surface of the branch pipe, A main pipe rehabilitation process in which a main pipe rehabilitation material is installed along the inner circumferential surface of the main pipe including the branch portion, The process includes drilling through holes in the main pipe rehabilitation material at the branching portion, The branch pipe has a flange portion at the end opposite to the branch portion, The branch pipe rehabilitation process involves rehabilitating the section from the surface of the flange to the branch portion as a whole. A method for applying rehabilitation material characterized by the following.

3. A method for applying a rehabilitation material to rehabilitate an existing pipe, including the branching portion between the main pipe and the branch pipe, by covering the inner surface of the pipe. A partial repair step involves installing a partial repair material from the inner surface of the branch pipe to the inner surface of the main pipe, including the branch portion. A main pipe rehabilitation process in which a main pipe rehabilitation material is installed along the inner circumferential surface of the main pipe including the branch portion, The process involves drilling through holes in the main pipe rehabilitation material at the aforementioned branching section, The process includes installing a branch pipe rehabilitation material along the inner surface of the branch pipe, The branch pipe has a flange portion at the end opposite to the branch portion, The branch pipe rehabilitation process involves rehabilitating the entire section from the surface of the flange to the through hole. A method for applying rehabilitation material characterized by the following.

4. A method for applying a rehabilitation material to rehabilitate an existing pipe, including the branching portion between the main pipe and the branch pipe, by covering the inner surface of the pipe. A partial repair step involves installing a partial repair material from the inner surface of the branch pipe to the inner surface of the main pipe, including the branch portion. A branch pipe rehabilitation process involves installing a branch pipe rehabilitation material along the inner circumferential surface of the branch pipe, A main pipe rehabilitation process in which a main pipe rehabilitation material is installed along the inner circumferential surface of the main pipe including the branch portion, The process includes drilling through holes in the main pipe rehabilitation material at the branching portion, The branch pipe has a flange portion at the end opposite to the branch portion, The branch pipe rehabilitation process involves rehabilitating the section from the surface of the flange to the branch portion as a whole. A method for applying rehabilitation material characterized by the following.

5. The aforementioned existing pipe is an internal pressure pipe. A method for applying a rehabilitation material according to any one of claims 1 to 4.

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