Application method of rehabilitation material

Abstract

To improve watertightness from the flange portion of the branch pipe to the branch portion of the main pipe at the other end, and to perform the rehabilitation of the branch portion of the main pipe and the branch pipe as a single integrated process in a short period of time. [Solution] The method for installing the rehabilitation material comprises: a main pipe rehabilitation step of installing the main pipe rehabilitation material 21 along the inner circumferential surface of the main pipe 1 including the branch section 10; a drilling step of drilling a through hole 22 in the main pipe rehabilitation material 21 at the branch section 10; a packer installation step of deploying a packer 40 inside the main pipe 1 to close the through hole 22; a tubular member insertion step of inserting a tubular member 41 having an outer diameter smaller than the inner diameter of the branch pipe 2 from the flange section 5 side toward the through hole 22 and installing it on the packer 40; a filler filling step of filling the gap V between the inserted tubular member 41 and the branch pipe 2 with a filler 42 from the flange section 5 side to the branch section 10 of the main pipe 1; and an adhesion step of bonding the tubular member 41 and the filler 42 to the surface of the flange section 5 such that the resin flange 43 covers them.

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 to the branch parts of pipes and repairs to 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, repairs and recycling are generally carried out only on the branch parts of the pipes (see, for example, 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, the branch pipe is replaced with a new pipe. In addition, for the branch pipe, resin may be applied to the branch part for recycling.

[0004] Here, the replacement of the branch pipe requires a large-scale construction (work) such as excavating the road and replacing the branch pipe. There are various problems in the construction of replacing the branch pipe of a water supply pipe or an internal pressure pipe, such as a long water cut-off period during the construction 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] If the techniques used to repair sewer pipe branches are applied to water supply pipes and internal pressure pipes, even a slight defect in the lining joints can cause water to seep between the lining and the existing pipe. In other words, applying the techniques used to repair sewer pipes to water supply pipe branches results in water leaking through the gap between the lining and the existing pipe. In this case, if water leaks through the gap between the lining and the existing pipe, it can get behind the lining, potentially causing the lining coating to peel off.

[0008] Figure 22 is an explanatory diagram showing a comparative example as prior art. In the comparative example in Figure 22, the branch section 10P connecting the main pipe 1 and the branch pipe 2 is shown.

[0009] As shown in Figure 22, 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. Thus, a branch section 10P is formed at the point where the main pipe 1 and the branch pipe 2 connect.

[0010] 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.

[0011] In the comparative example shown in Figure 22, a 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 the 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.

[0012] Here, the comparative example shown in Figure 22 is an example in which a repair method for repairing a branch section 10P in a sewer is applied 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 22, 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.

[0013] In conventional sewer construction methods, as shown in Figure 22, 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.

[0014] 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.

[0015] 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]

[0016] 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, wherein the branch pipe has a flange portion at the end opposite to the branch portion, and comprises: 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; a packer installation step of deploying a packer inside the main pipe to close the through hole; a tubular member insertion step of inserting a tubular member having an outer diameter smaller than the inner diameter of the branch pipe from the flange portion side toward the through hole and installing it on the packer; a filler filling step of filling the gap between the inserted tubular member and the branch pipe with a filler from the flange portion side to the branch portion of the main pipe; and an adhesion step of adhering a resin flange to the surface of the flange portion such that the resin flange covers the tubular member and the filler. [Effects of the Invention]

[0017] 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]

[0018] [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 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]It is an explanatory diagram showing a state in which a packer is inflated inside this pipe to block the through-hole. [Figure 7] It is an explanatory diagram showing a state in which a tubular member is installed on top of a packer at the branch portion of this pipe. [Figure 8] It is an explanatory diagram showing a state in which a filler is filled in the gap shown in FIG. 7. [Figure 9] It is an explanatory diagram showing a state in which a branch pipe 6 is connected to a branch pipe 2 after the branch pipe regeneration process is performed. [Figure 10] It is an explanatory diagram showing a state in which a resin flange is adhered to the surface of the flange portion of the branch pipe. [Figure 11] It is an explanatory diagram showing a state in which a branch pipe 6 is connected to a branch pipe 2 after the resin flange adhesion process (step S011) is performed. [Figure 12] It is a flowchart showing a method for constructing a regeneration material according to the second embodiment. [Figure 13] It is an explanatory diagram showing an example in which a tubular member is inserted from the flange portion side of the branch pipe into the main pipe regeneration material at the branch portion in step S101. [Figure 14] It is an explanatory diagram showing a state in which a filler is filled in the gap shown in FIG. 13. [Figure 15] It is an explanatory diagram showing a state in which a through-hole is drilled in the main pipe regeneration material at the branch portion of the main pipe. [Figure 16] It is an explanatory diagram showing a state in which a resin flange is adhered to the surface of the flange portion of the branch pipe. [Figure 17] It is an explanatory diagram showing that a cylindrical member is installed at the center of the branch pipe. [Figure 18] It is an explanatory diagram showing a state in which a cylindrical member is inflated and covers the inner peripheral surface of the tubular member. [Figure 19] The inner peripheral surface of the branch pipe is shown in a regenerated state with a cylindrical member by the method of covering the cylindrical member shown in FIGS. 17 and 18 with the tubular member. [Figure 20] It is an explanatory diagram showing a state in which a branch pipe 6 is connected to a branch pipe 2 after the branch pipe covering process (step S109) is performed. [Figure 21] This is an explanatory diagram showing the state after filling the rounded section of the branch with filler material before drilling through holes in the main pipe rehabilitation material. [Figure 22] This is an explanatory diagram showing a comparative example of conventional technology. [Modes for carrying out the invention]

[0019] The embodiments for carrying out the present invention will be described in detail below. The embodiments described below are just examples for realizing the present invention and should be modified or changed as appropriate depending on the configuration of the apparatus to which the present invention is applied and various conditions, and the present invention is not limited to the embodiments described below. In each figure, the same components are denoted by the same reference numerals, and redundant explanations are omitted as appropriate.

[0020] <First Embodiment> This embodiment describes a method for repairing the branch section of a water pipe buried underground, specifically the branch section between the existing main pipe and the branch pipe, as a single integrated repair. In particular, this embodiment involves not only covering the inner surface of the main pipe but also covering the inner surface of the branch pipe, thereby rehabilitating the branch section as a whole. Below, we will first explain the structure of the branch section and then, with reference to a flowchart, describe the construction method for a water pipe, which is an example of an internal pressure pipe.

[0021] [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.

[0022] 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.

[0023] [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).

[0024] As shown in Figure 2, the method for constructing the rehabilitation material according to the first embodiment involves the following steps: main pipe rehabilitation step (step S001), through hole drilling step (step S003), packer installation step (step S005), tubular member insertion step (step S007), filler filling step (step S009), and resin flange bonding step (step S011).

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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. The diameter of the through-hole 22 is smaller than the inner diameter of the branch pipe 2. For example, if the inner diameter of the branch pipe 2 is 100 [mm], the diameter of the through-hole 22 can be 80 [mm].

[0036] Returning to Figure 2, we continue the explanation. In the packer installation process shown in step S005, the packer 40 is deployed inside the main pipe 1 at the branch section 10 to seal the through hole 22. In this embodiment, the packer installation process seals the through hole 22 by injecting air inside the main pipe 1 to deploy the packer 40, thereby preventing water leakage from the branch pipe 2 into the main pipe 1.

[0037] Figure 6 is an explanatory diagram showing the packer being inflated inside the main pipe to seal the through-hole.

[0038] As shown in Figure 6, a packer 40 is installed inside the main pipe 1. The packer 40 is made of rubber, for example. The packer 40 is pressurized, for example, by air pressure or water pressure, and the rubber expands, sealing the through hole 22. As a result, the packer 40 can block the tubular member 41 in the tubular member insertion process described later.

[0039] Returning to Figure 2, we continue the explanation. In the tubular member insertion step shown in step S007, the tubular member 41 is inserted from the flange portion 5 side of the branch pipe 2 toward the through hole 22 and placed on top of the packer 40.

[0040] Figure 7 is an explanatory diagram showing the state in which a tubular member is installed on top of a packer at the branching section of the main pipe.

[0041] As shown in Figure 7, in this embodiment, in the branch section 10, the tubular member 41 is installed on the surface where the packer 40 has blocked the through hole 22. The outer diameter of the tubular member 41 is smaller than the inner diameter of the branch pipe 2. As a result, the tubular member 41 is inserted from the flange portion 5 side of the branch pipe 2 toward the through hole 22. Also, the outer diameter of the tubular member 41 matches the outer diameter of the through hole 22. By standing upright on the packer 40, the tubular member 41 covers the cross section of the main pipe rehabilitation material 21 on the through hole 22 side. In this way, the packer 40 blocks the tubular member 41.

[0042] Furthermore, the tubular member 41 has a predetermined thickness (for example, 5 mm) in its tubular portion, and since the outer diameter of the tubular member 41 is smaller than the inner diameter of the branch pipe 2, the tubular member 41 is housed inside the branch pipe 2. A predetermined gap V is formed between the outer diameter of the tubular member 41 and the inner diameter of the branch pipe 2. The gap V becomes smaller when a tubular member 41 with a larger outer diameter is selected, and conversely, it becomes larger when a tubular member 41 with a smaller outer diameter is selected. In this way, the width of the gap V can be adjusted by appropriately selecting the outer diameter of the tubular member 41.

[0043] Returning to Figure 2, we continue the explanation. In the filler filling step shown in step S009, the filler 42 is filled into the gap V between the outer surface of the inserted tubular member 41 and the inner surface of the branch pipe 2, from the flange portion 5 side of the branch pipe 2 to the branch portion 10 of the main pipe 1.

[0044] Figure 8 is an explanatory diagram showing the state in which the void shown in Figure 7 is filled with a filler material.

[0045] As shown in Figure 8, a filler 42 is filled between the inner surface of the branch pipe 2 and the outer surface of the tubular member 41. In addition, at the branch section 10, the filler 42 is filled between the outer surface of the main pipe rehabilitation material 21 and the outer surface of the tubular member 41, on the side facing the inner surfaces of the main pipe 1 and the branch pipe 2.

[0046] The filler 42 is made of, for example, a thermosetting resin, and after being filled into the void V, it hardens when the outside of the branch pipe 2 is heated with a heater. Once the filler 42 hardens, the packer 40 is removed from the main pipe 1. Alternatively, the filler 42 may be hardened by heating it from the inside of the tubular member 41.

[0047] Figure 9 is an explanatory diagram showing the state in which a tubular member and a filler are installed on the inner circumferential surface of a branch pipe.

[0048] As shown in Figure 9, the tubular member 41 and the filler 42 are installed on the inner circumferential surface of the branch pipe 2 by the tubular member insertion step in step S007 and the filler filling step in step S009. In the branch section 10, the tubular member 41 covers the cross section of the main pipe rehabilitation material 21 on the through-hole 22 side. Here, the filler 42 has been described as a thermosetting resin as an example, but is not limited to this, and for example, grout made of mortar may be injected into the predetermined void V between the tubular member 41 and the branch pipe 2.

[0049] 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 22 of the main pipe rehabilitation material 21. The filler 42 also penetrates into this annular recess. As a result, the contact area between the main pipe rehabilitation material 21 and the filler 42 increases, and the two are more firmly integrated.

[0050] Furthermore, the corners formed at the branching portion 10 of the main pipe 1 and the branching portion 2 are 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 filler 42. Therefore, the filler 42 covers at least the branching portion 10 of the main pipe 1 and the inner circumferential surface of the branching pipe 2, thereby integrating the main pipe 1 and the branching pipe 2.

[0051] Returning to Figure 2, we continue the explanation. In the resin flange bonding step shown in step S011, the resin flange 43 is bonded to the surface of the flange portion 5 of the branch pipe 2 such that the resin flange 43 covers the tubular member 41 and the filler 42.

[0052] Figure 10 is an explanatory diagram showing the state in which a resin flange is bonded to the surface of the flange portion of the branch pipe.

[0053] As shown in Figure 10, the resin flange 43 is bonded to the surface of the flange portion 5 of the branch pipe 2 so as to cover the tubular member 41 and the filler 42. With the filler 42 filling the gap V, in the first embodiment, the filler 42 is filled between the inner circumferential surface of the branch pipe 2 and the outer circumferential surface of the tubular member 41. The resin flange 43 is made of, for example, a thermosetting resin. The resin flange 43 covers the tubular member 41 and the filler 42, and is installed integrally with the flange portion 5 as the surface of the flange portion 5 is heated.

[0054] In the first embodiment, the main pipe rehabilitation process (step S001) shown in Figures 3 and 4, the through-hole drilling process (step S003) shown in Figure 5, the packer installation process (step S005) shown in Figure 6, the tubular member insertion process (step S007) shown in Figure 7, the filler filling process (step S009) shown in Figures 8 and 9, and the resin flange bonding process (step S011) shown in Figure 10 are performed, which completes the flowchart shown in Figure 2.

[0055] Thus, the branch pipe 2 shown in Figure 10 is completed by installing a tubular member 41 on its inner circumference and a resin flange 43 on the surface of the flange portion 5, thereby concluding the first method of applying the rehabilitation material.

[0056] Figure 11 is an explanatory diagram showing the state after the resin flange bonding process (step S011) has been completed and the branch pipe 6 has been connected to the branch pipe 2.

[0057] As shown in Figure 11, 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.

[0058] As described above, the method for applying the rehabilitation material according to the first embodiment (first application method) 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 includes a main pipe rehabilitation step (step S001), a through hole drilling step (step S003), a packer installation step (step S005), a tubular member insertion step (step S007), a filler filling step (step S009), and a resin flange bonding step (step S011). The branch pipe 2 also has a flange portion 5 at the end opposite to the branch portion 10.

[0059] As a result, in the method of installing the rehabilitation material according to the first embodiment, the tubular member 41 is inserted and installed from the flange portion 5 side of the branch pipe 2 toward the through hole 22 in the tubular member insertion step (step S007). Therefore, the method of installing the rehabilitation material according to the first embodiment can rehabilitate the section from the flange portion 5 to the through hole 22 in an integrated manner.

[0060] The method for applying the rehabilitation material according to the first embodiment, as shown in Figure 10, for example, solves the problems shown in the comparative example in Figure 21 and prevents water from leaking through the gap between the repair material 31P and the branch pipe 2, thus preventing water from entering the back side of the repair material 31P. Furthermore, the method for applying the rehabilitation material according to the first 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. In particular, since the resin flange 43 covers the flange portion 5 side of the tubular member 41 and the flange side of the filler 42 filled in the void V, it is possible to prevent water from entering the inner circumferential surface of the branch pipe 2.

[0061] <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 has been rearranged compared to the first embodiment, and is a modified example of the method for applying the rehabilitation material according to the first embodiment.

[0062] In the method for constructing the rehabilitation material according to the second embodiment, after the main pipe rehabilitation process (step S001) is carried out, the tubular member 41 is inserted into the main pipe rehabilitation material 21. Then, in the method for constructing the rehabilitation material according to the second embodiment, the filler 42 is filled into the void V and then the through hole 22 is drilled.

[0063] 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 the following steps: main pipe rehabilitation step (step S001), tubular member insertion step (step S101), filler filling step (step S103), through hole drilling step (step S105), resin flange bonding step (step S107), and branch pipe covering step (step S109).

[0064] Figure 12 is a flowchart showing the application method of the rehabilitation material according to the second embodiment (second application method).

[0065] The flowchart of the rehabilitation material application method according to the second embodiment shown in Figure 12 differs from the flowchart of the rehabilitation material application method according to the first embodiment shown in Figure 2 in that the order of the tubular member insertion step (step S007) and the filler filling step (step S009) shown in Figure 2 is swapped with the through-hole drilling step (step S003). Another difference is that the branch pipe covering step (step S109) is performed after the resin flange bonding step (step S011) shown in Figure 2.

[0066] As a result, as shown in Figure 12, the tubular member insertion step (step S101) and the filler filling step (step S103) are performed before the through-hole drilling step (step S105). Even if the order of the work is changed in this way, the method of applying the rehabilitation material according to the second embodiment can be applied in general the same way as the method of applying the rehabilitation material according to the first embodiment. However, the method of applying the rehabilitation material according to the second embodiment does not use packers 40, so the application is slightly different. Therefore, the differences will be explained.

[0067] As shown in Figure 12, 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, similar to the construction method of the first embodiment shown in Figure 2.

[0068] Next, in the tubular member insertion step shown in step S101, the tubular member 41 is inserted into the main pipe rehabilitation material 21 of the branch pipe 2 from the flange portion 5 side of the branch pipe 2.

[0069] Figure 13 is an explanatory diagram showing an example in step S101 in which a tubular member is inserted into the main pipe rehabilitation material at the branch section from the flange side of the branch pipe.

[0070] As shown in Figure 13, in the second embodiment, the tubular member 41 is inserted along the inner circumferential surface of the branch pipe 2 and installed on the main pipe rehabilitation material 21 of the branch section 10. The outer diameter of the tubular member 41 is smaller than the inner diameter of the branch pipe 2, and the insertion side of the tubular member 41 is blocked by the main pipe rehabilitation material 21 of the branch section 10.

[0071] Furthermore, a predetermined gap V is formed between the outer surface of the tubular member 41 and the inner surface of the branch pipe 2. The gap V becomes smaller when a tubular member 41 with a larger outer diameter is selected, and larger when a tubular member 41 with a smaller outer diameter is selected. In this way, the width of the gap V can be adjusted by appropriately selecting the outer diameter of the tubular member 41.

[0072] The difference between the tubular member insertion step shown in step S101 and the tubular member insertion step shown in step S007 in Figure 2 is that the tubular member 41 is upright on the main pipe rehabilitation material 21, rather than on the packer 40. Otherwise, it is the same as the tubular member insertion step shown in step S007 in Figure 2.

[0073] Returning to Figure 12, we continue the explanation. In the filler filling step shown in step S103, the filler 42 is filled into the gap V between the outer surface of the inserted tubular member 41 and the inner surface of the branch pipe 2, from the flange portion 5 side of the branch pipe 2 to the branch portion 10 of the main pipe 1.

[0074] Figure 14 is an explanatory diagram showing the state in which the void shown in Figure 13 is filled with a filler material.

[0075] As shown in Figure 14, a filler 42 is filled between the inner surface of the branch pipe 2 and the outer surface of the tubular member 41. In addition, at the branch section 10, the filler 42 is filled between the outer surface of the main pipe rehabilitation material 21 and the outer surface of the tubular member 41, on the inner surface side of the main pipe 1 and the branch pipe 2.

[0076] Returning to Figure 12, we continue the explanation. In the through-hole drilling process shown in step S105, a through-hole 22 is drilled in the main pipe rehabilitation material 21 at the branching section 10.

[0077] Figure 15 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.

[0078] As shown in Figure 15, a through-hole 22 is formed in the branch portion 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 portion 5 side of the branch pipe 2. The through-hole drilling process shown in step S105 allows for a smaller diameter of the through-hole 22 than the through-hole drilling process shown in step S003 in Figure 2, by the thickness of the tubular member 41 and the filler material 42. Therefore, the second embodiment allows for easy and accurate drilling of the through-hole 22 and reduces the time required to drill through the main pipe rehabilitation material 21.

[0079] Returning to Figure 12, we continue the explanation. In the resin flange bonding step shown in step S107, the resin flange 43 is bonded to the surface of the flange portion 5 of the branch pipe 2 such that the resin flange 43 covers the tubular member 41 and the filler 42.

[0080] Figure 16 is an explanatory diagram showing the state in which a resin flange is bonded to the surface of the flange portion of the branch pipe.

[0081] As shown in Figure 16, the resin flange 43 is bonded to the surface of the flange portion 5 of the branch pipe 2 so as to cover the tubular member 41 and the filler 42. With the filler 42 filling the gap V, in the second embodiment, similar to the first embodiment, the filler 42 is filled between the inner circumferential surface of the branch pipe 2 and the outer circumferential surface of the tubular member 41. The resin flange 43 is made of, for example, a thermosetting resin. The resin flange 43 covers the tubular member 41 and the filler 42, and is installed integrally with the flange portion 5 by heating the surface of the flange portion 5.

[0082] Returning to Figure 12, we continue the explanation. In the branch pipe covering process shown in step S109, the inner surface of the tubular member 41 is covered with the cylindrical member 24 from the flange portion 5 side of the branch pipe 2 along the inner surface of the branch pipe 2 to the cross section of the through hole 22 of the main pipe rehabilitation material 21, thereby rehabilitating the pipe.

[0083] Figure 17 is an explanatory diagram showing that a cylindrical member has been installed in the center of the branch pipe.

[0084] As shown in Figure 17, a cylindrical member 24 is installed in the center of the branch pipe 2. The cylindrical member 24 is formed from a cylindrical balloon and consists of two layers, for example, a covering material and an annular nonwoven fabric. The covering material is made of polyethylene and provides watertightness. The annular nonwoven fabric is made of polyester and protects the covering material. The annular nonwoven fabric of the cylindrical member 24 is installed on the side facing the tubular member 41, and the covering material is installed on the flow path side. The annular nonwoven fabric of the cylindrical member 24 is impregnated with a thermosetting resin or a photocurable resin. A photocurable resin is a resin that hardens when irradiated with light (ultraviolet light). The cylindrical member 24 is installed inside the tubular member 41 for the purpose of lining.

[0085] Figure 18 is an explanatory diagram showing a state in which a cylindrical member is inflated and the inner circumferential surface of the tubular member is covered with another cylindrical member.

[0086] As shown in Figure 18, in the second embodiment, the cylindrical member 24 is attached to the inside of the tubular member 41.

[0087] The cylindrical member 24 is inflated by, for example, a blower or air pressure machine (not shown). In the second embodiment, the cylindrical member 24 expands and adheres to the inside of the tubular member 41, so that the cylindrical member 24 covers the inner circumferential surface of the tubular member 41. As a result, the cylindrical member 24 forms a resin lining. The cylindrical member 24 is also hardened by irradiation with heat or light. After the cylindrical member 24 has hardened, for example, the tip of the cylindrical member 24 on the main pipe 1 side is cut. As a result, the cylindrical member 24 is shaped to cover (surround) the cross-section of the main pipe rehabilitation material 21.

[0088] Figure 19 is an explanatory diagram showing the state in which the inner circumferential surface of the branch pipe has been rehabilitated with a cylindrical member by covering the tubular member with the cylindrical member shown in Figures 17 and 18.

[0089] As shown in Figure 19, the inner circumferential surface of the branch pipe 2 (tubular member 41) is evenly coated with a resin lining by the cylindrical member 24. The resin lining is not limited to either a thermosetting resin or a photocurable resin impregnated into the annular nonwoven fabric constituting the cylindrical member 24. Furthermore, the cylindrical member 24 may be made of a rubber material (such as natural rubber, butyl rubber, or nitrile rubber).

[0090] The branch pipe covering process shown in step S109, illustrated in Figures 17 to 19, is not limited to this. For example, the branch pipe covering process in step S109 may be carried out using other known forming methods.

[0091] In the second embodiment, the main pipe rehabilitation process (step S001) shown in Figures 3 and 4, the tubular member insertion process (step S101) shown in Figure 13, the filler filling process (step S103) shown in Figure 14, the through-hole drilling process (step S105) shown in Figure 15, the resin flange bonding process (step S107) shown in Figure 16, and the branch pipe covering process (step S109) shown in Figures 17 to 19 are performed, which completes the flowchart shown in Figure 12.

[0092] As shown in Figure 19, the branch pipe 2 has a tubular member 41 installed on its inner circumference, and the gap V formed by the installation of the tubular member 41 is filled with a filler 42. The resin flange 43 is then bonded to the surface of the flange portion 5 of the branch pipe 2 so that it covers the tubular member 41 and the filler 42. The inner circumference of the tubular member 41 is then covered with a cylindrical member 24 from the flange portion 5 side of the branch pipe 2 along the inner circumference of the branch pipe 2 up to the cross section of the through hole 22 of the main pipe rehabilitation material 21, thus completing the installation method of the second rehabilitation material.

[0093] Figure 20 is an explanatory diagram showing the state after the branch pipe covering process (step S109) has been completed and branch pipe 6 has been connected to branch pipe 2.

[0094] As shown in Figure 20, in the second embodiment, similar to Figure 11 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.

[0095] As described above, the method for applying the rehabilitation material according to the second embodiment (second application method) 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 includes a main pipe rehabilitation step (step S001), a tubular member insertion step (step S101), a filler filling step (step S103), a through hole drilling step (step S105), a resin flange bonding step (step S107), and a branch pipe covering step (step S109). The branch pipe 2 also has a flange portion 5 at the end opposite to the branch portion 10.

[0096] As a result, in the method for installing the rehabilitation material according to the second embodiment, the tubular member 41 is inserted into the main pipe rehabilitation material 21 of the branch section 10 from the flange portion 5 side of the branch pipe 2 in the tubular member insertion step (step S101). In the second embodiment, the inner surface of the tubular member 41 is also covered with a cylindrical member 24 from the flange portion 5 side of the branch pipe 2, along the inner surface of the branch pipe 2, up to the cross section of the through hole 22 of the main pipe rehabilitation material 21, thereby performing rehabilitation.

[0097] In the method for installing the rehabilitation material according to the second embodiment, for example as shown in Figure 19, a tubular member 41 is inserted and installed, then a resin flange 43 is bonded to the surface of the flange portion 5, and further, the cylindrical member 24 allows for integral rehabilitation from the flange portion 5 side of the branch pipe 2 to the cross section of the through hole 22 of the main pipe rehabilitation material 21. As a result, the resin flange 43 solves the problem shown in the comparative example in Figure 22 and prevents water from entering through the gap between the tubular member 41 and the branch pipe 2 at the flange portion 5. In addition, since the cylindrical member 24 covers the cross section on the through hole 22 side of the main pipe rehabilitation material 21, it can prevent water from entering through the gap between the tubular member 41 and the main pipe rehabilitation material 21.

[0098] Thus, the method for applying the rehabilitation material according to the second embodiment can further improve watertightness compared to the first method.

[0099] <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 filler filling process of step S009, when the filler 42 is filled into the inner circumferential surface of the branch pipe 2, air (bubbles) may be mixed between the branch pipe 2 and the main pipe rehabilitation material 21.

[0100] Therefore, in the through-hole drilling process shown in step S003 of Figure 2, the filler 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. Specifically, in the branch section 10, a filling process may be carried out in which the filler 32 for releasing air may be filled into the rounded part formed by the main pipe rehabilitation material 21 and the branch pipe 2.

[0101] Figure 21 is an explanatory diagram showing the state in which the rounded section of the branching part has been filled with filler material before drilling through holes in the main pipe rehabilitation material.

[0102] As shown in Figure 21, in the modified example, a filler 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 the filler 32, it is possible to avoid air remaining in the rounded shape M of the branch section 10 when performing the filler filling process in step S009.

[0103] Therefore, in the modified example, with the main pipe rehabilitation material 21 including the rounded section M of the branch section 10 filled with filler 32, a through hole 22 is drilled in 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 section M of the branch section 10 can be removed, so even if the filler filling process shown in step S009 of Figure 2 is performed, the incorporation of air into the filler 42 of the branch section 10 shown in Figure 8 can be avoided, and the filler 42 can be strengthened.

[0104] Similarly, in the method of constructing the rehabilitation material according to the second embodiment, air tends to remain in the rounded portion of the connection between the main pipe 1 and the branch pipe 2 of the branch section 10. Therefore, in the tubular member insertion step shown in step S101 of Figure 12, before inserting and installing the tubular member 41 into the main pipe rehabilitation material 21, a filling step of filling with a filler 32 may be performed as shown in Figure 21 to fill the rounded portion of the branch section 10 with the filler 32.

[0105] Furthermore, both the first and second construction methods described above can be flexibly selected and applied depending on the deterioration and aging of the existing pipes 3 at the construction site.

[0106] Furthermore, while the first and second embodiments described water pipes buried underground as examples, this embodiment is not limited to these. For example, it can also be applied to internal pressure pipes that are not buried underground, such as aqueducts. [Explanation of Symbols]

[0107] 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 Inflatable bags 21 Main pipe rehabilitation material 22 Through hole 24 Cylindrical member 25 O-rings 26 Packing 31P Repair Material 32 Filler 40 Packers 41 Tubular member 42 Filler 43 Resin flange 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. The branch pipe has a flange portion at the end opposite to 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, A packer installation step involves deploying the packer inside the main pipe to seal the through-hole, A tubular member insertion step involves inserting a tubular member with an outer diameter smaller than the inner diameter of the branch pipe from the flange side toward the through hole and placing it on top of the packer. A filler filling step is performed in which a filler is filled into the gap between the inserted tubular member and the branch pipe from the flange side to the branch portion of the main pipe, The bonding step involves bonding the resin flange to the surface of the flange portion such that the resin flange covers the tubular member and the filler, A method for applying a rehabilitation material, characterized by comprising 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. The branch pipe has a flange portion at the end opposite to 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, A tubular member insertion step involves inserting a tubular member having an outer diameter smaller than the inner diameter of the branch pipe into the main pipe rehabilitation material of the branch portion from the flange portion side. A filler filling step is performed in which a filler is filled into the gap between the inserted tubular member and the branch pipe, from the flange side to the main pipe rehabilitation material of the main pipe, The process involves drilling through holes in the main pipe rehabilitation material at the aforementioned branching section, The bonding step involves bonding the resin flange to the surface of the flange portion such that the resin flange covers the tubular member and the filler, A branch pipe covering step is performed by covering the inner surface of the tubular member with a cylindrical member from the flange side along the inner surface of the branch pipe to the cross section of the through hole in the main pipe rehabilitation material, and rehabilitating the branch pipe. A method for applying a rehabilitation material, characterized by comprising the following:

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