Joint structure for piping and method for assembling joint structure for piping

Abstract

To reliably seal a joint space between an existing pipe and a new pipe.SOLUTION: A thermopipe 12 is installed inside an existing pipe 1, and the thermopipe 12 and a core pipe 11 extend from an inner surface of the existing pipe 1 through a joint space 5 to an inner surface of the new pipe 2. The thermopipe is sandwiched between the core pipe 11 and a rubber ring 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a pipe joint structure and a method for assembling the pipe joint structure. [Background technology]

[0002] The Thermopipe method is known, in which the existing pipe is left buried, a Thermopipe is inserted into the existing pipe to repair it, and a new pipe is joined to the existing pipe. That is, this Thermopipe method is a technology in which a synthetic resin Thermopipe is inserted into the existing pipe from the end, and a new pipe is joined to the end of the existing pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-60857 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional Thermopipe method does not provide sufficient sealing at the joint between the existing pipe and the new pipe. Also, the Thermopipe is placed protruding outward from the end of the existing pipe. When the temperature drops due to environmental changes, the Thermopipe shrinks and enters the existing pipe, making it more difficult to seal the joint between the existing pipe and the new pipe with the Thermopipe.

[0005] The present disclosure has been made in consideration of these points, and aims to provide a piping joint structure and a method for assembling a piping joint structure that improves sealing at the joint between an existing pipe and a newly installed pipe when repair work on an existing pipe is performed using a Thermopipe. [Means for solving the problem]

[0006] The present disclosure relates to a piping joint structure comprising an existing pipe having a thermopipe provided on its inner surface, a new pipe arranged at an end of the existing pipe via a joint space, a core pipe extending from the inner surface of the existing pipe to the inner surface of the new pipe, a housing covering the outside of the existing pipe and the new pipe, and a rubber ring provided within the housing and extending into the joint space, wherein the thermopipe extends from the inner surface of the existing pipe through the joint space to the inner surface of the new pipe, and the thermopipe is clamped between the rubber ring located in the joint space and the core pipe.

[0007] The present disclosure relates to a piping joint structure in which the rubber ring has an inner portion that fits into the joint space and an outer portion that is positioned radially outward of the existing pipe and the new pipe, and the inner portion fills the joint space and seals the joint space.

[0008] The present disclosure is a piping joint structure in which a first uneven structure is formed on the outer surface of the core pipe, a second uneven structure is formed on the inner surface of the inner portion of the rubber ring, and the thermopipe is sandwiched between the first uneven structure and the second uneven structure.

[0009] The present disclosure relates to a piping joint structure in which an inner portion of the rubber ring abuts against end faces of the existing pipe and the newly installed pipe.

[0010] The present disclosure relates to a piping joint structure in which the core pipe extends approximately the same length along the axial direction toward the inner surface of the existing pipe and the inner surface of the new pipe, centered on the central portion of the rubber ring, and a stopper is provided at the end of the core pipe on the new pipe side to engage with the end of the thermopipe.

[0011] The present disclosure relates to a method for assembling a pipe fitting, comprising the steps of: preparing an existing pipe; installing a thermopipe on an inner surface of the existing pipe and causing the thermopipe to protrude outward from an end of the existing pipe; inserting a core pipe into the existing pipe from the end of the existing pipe and causing the core pipe to protrude outward from the end of the existing pipe; placing a rubber ring on the end of the existing pipe; placing a new pipe on the end of the existing pipe via the rubber ring and placing the thermopipe and core pipe protruding from the end of the existing pipe on the inner surface of the new pipe; and placing divided parts of a housing on the outer periphery of the rubber ring and tightening each divided part with a fastening means. Effect of the Invention

[0012] According to the present disclosure, when repair work on an existing pipe is performed using a Thermopipe, it is possible to improve the sealing performance at the joint between the existing pipe and the newly constructed pipe. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is an enlarged cross-sectional side view showing a piping joint structure according to the present disclosure. [Diagram 2] FIG. 2 is a side cross-sectional view showing a pipe joint structure. [Diagram 3] FIG. 3 is a front view showing a pipe joint structure. [Figure 4] FIG. 4 is a partially cutaway perspective view showing a pipe joint structure. [Figure 5A] FIG. 5A is a diagram showing a method of assembling a piping joint structure. [Figure 5B] FIG. 5B is a diagram showing a method of assembling the piping joint structure. [Figure 5C] FIG. 5C is a diagram showing a method of assembling the piping joint structure. [Figure 5D] FIG. 5D is a diagram showing a method of assembling the piping joint structure. [Figure 6] Figure 6 shows repair work on existing pipes using Thermopipes. [Figure 7] FIG. 7 is a cross-sectional view showing the cross-sectional structure of a thermo-pipe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0015] 1 to 5D show an embodiment of the present disclosure.

[0016] The piping joint structure according to the present disclosure is installed when repair work is performed on an existing pipe using a Thermopipe.

[0017] That is, as shown in Figure 6, an existing pipe 1 buried underground G is generally lined and painted beforehand, but the lining and paint inside the existing pipe 1 deteriorate over time. Therefore, the ground is excavated to form a vertical hole G1, and the existing pipe 1 is exposed. The existing pipe 1 is then cut at a predetermined location to form an end 1a on the existing pipe 1. Next, a thermopipe 12 is inserted into the existing pipe 1 from the end 1a, and the thermopipe 12 is brought into close contact with the inner surface of the existing pipe 1, thereby carrying out repair work on the existing pipe 1 (see Figure 1).

[0018] When installing a thermopipe 12 on the inner surface of an existing pipe 1, as described above, the thermopipe 12 is inserted into the inner surface of the existing pipe 1 from the end 1a of the existing pipe 1, and high-pressure steam is supplied into the existing pipe 1 to make the thermopipe 12 adhere to the inner surface of the existing pipe 1, thereby making the thermopipe adhere to the inner surface of the existing pipe 1.

[0019] Thereafter, as described below, an end 2a of a newly installed pipe 2 that has been subjected to a highly functional lining, painting, etc. is joined to an end 1a of the existing pipe 1, thereby obtaining a piping joint structure 10 according to this embodiment.

[0020] By repeating such operations, the repair work for the existing pipe 1 buried underground G is completed.

[0021] In this embodiment, cylindrical water pipes are used as the existing pipe 1 and the new pipe 2, and for example, cast iron pipes, steel pipes, rigid PVC pipes (also called rigid polyvinyl chloride pipes or PVC pipes), etc. can be used.

[0022] The inside of the existing pipe 1 is lined, painted, etc., but the lining, paint, etc. may deteriorate over time, in which case repair work is carried out using the above-mentioned Thermopipe 12. The inside of the new pipe 2 is also lined, painted, etc., but the lining, paint, etc. in the new pipe 2 are relatively high-performance and less prone to deterioration compared to those in the existing pipe.

[0023] As the thermopipe 12, for example, as shown in FIG. 7, it is possible to use one having a three-layer structure in cross section, which includes a polyurethane layer 12a, a reticulated polyester core layer 12b, and a polyurethane layer 12c.

[0024] In this embodiment, a cylindrical thermopipe 12 is inserted into the existing pipe 1, and then high-pressure steam is supplied into the existing pipe 1, causing the thermopipe 12 to expand along the inner surface shape of the existing pipe 1. Then, by continuing to hold high-pressure steam in the existing pipe 1 for a predetermined period of time, the thermopipe 12 can be made to adhere tightly to the inner surface of the existing pipe 1. The thermopipe 12 installed in the existing pipe 1 functions as an additional lining, coating, etc. that prevents corrosion and deterioration of the existing pipe 1 due to the liquid in the existing pipe 1.

[0025] Next, a pipe joint structure according to the present disclosure will be described.

[0026] As shown in Figures 1 to 4, a piping joint structure 10 comprises an existing pipe 1 having a thermopipe 12 attached to its inner surface as described above, a new pipe 2 arranged at an end 1a of the existing pipe 1 with a joint space 5 between them, a core pipe 11 extending from the inner surface of the existing pipe 1 to the inner surface of the new pipe 2, a housing 15 covering the outside of the existing pipe 1 and the new pipe 2, and a rubber ring 30 provided within the housing 15 and fitting into the joint space 5.

[0027] The joint space 5 is formed between the end 1a of the existing pipe 1 and the end 2a of the new pipe 2. The thermopipe 12 extends from the inner surface of the existing pipe 1 through the joint space 5 to the inner surface of the new pipe 2.

[0028] The core pipe 11 extends from the inner surface of the existing pipe 1 to the inner surface of the new pipe 2, and extends approximately the same length along the axial direction L centered on the rubber ring 30 toward the inner surfaces of the existing pipe 1 and the new pipe 2. That is, the length L1 of the core pipe 11 from the central portion 30a of the rubber ring 30 to the end on the existing pipe 1 side is approximately the same as the length L2 from the central portion 30a of the rubber ring 30 to the end on the new pipe 2 side. A stopper 11b that engages with the end of the thermo pipe 12 is provided at the end of the core pipe 11 on the new pipe 2 side.

[0029] That is, as described below, the core pipe 11 is inserted into the existing pipe 1 from the end 1a with the thermopipe 12 protruding from the end 1a of the existing pipe 1. In this case, the stopper 11b of the core pipe 11 engages with the end of the thermopipe 12. This allows the core pipe 11 to be positioned relative to the thermopipe 12.

[0030] In this embodiment, the thermopipe 12 extends from the inner surface of the existing pipe 1 through the joint space 5 to the inner surface of the new pipe 2. The thermopipe 12 is sandwiched between the core pipe 11 and a rubber ring 30 provided in the housing 15 and inserted into the joint space 5.

[0031] In this embodiment, the housing 15 is made of steel, and the core pipe 11 is also made of steel. Furthermore, the rubber ring 30 is made of hard rubber, and as the rubber ring 30, for example, chloroprene rubber (CR) with a hardness of 70°, styrene butadiene rubber (SBR), or ethylene propylene rubber (EPDM) can be used.

[0032] The rubber ring 30 has an inner portion 31 that fits into the joint space 5 between the existing pipe 1 and the new pipe 2, and an outer portion 32 that is located radially outward of the inner portion 31 and outward of the existing pipe 1 and the new pipe 2. By tightening the housing 15, the outer portion 32 of the rubber ring 30 is pressed between the outer surfaces of the existing pipe 1 and the new pipe 2 and the housing 15, and the outer portion 32 seals the outer surfaces of the existing pipe 1 and the new pipe 2.

[0033] In addition, a first uneven structure 11a is formed on the outer surface of the core pipe 11, and a second uneven structure 31a is formed on the inner surface of the inner portion 31 of the rubber ring 30. When the housing 15 is tightened, the thermopipe 12 is sandwiched between the first uneven structure 11a provided on the outer surface of the core pipe 11 and the second uneven structure 31a provided on the inner surface of the inner portion 31 of the rubber ring 30.

[0034] Generally, when the environment changes, particularly when the temperature drops, the thermopipe 12 shrinks significantly compared to the existing pipe 1 and the new pipe 2 , which may cause the thermopipe 12 to retract into the existing pipe 1 .

[0035] According to this embodiment, the thermopipe 12 is firmly sandwiched between the first uneven structure 11a of the core pipe 11 and the second uneven structure 31a of the inner part 31 of the rubber ring 30, so that even when the temperature drops and the thermopipe 12 shrinks, the thermopipe 12 can be prevented from retracting into the existing pipe 1. In this way, the thermopipe 12 can be sandwiched and held between the core pipe 11 and the inner part 31 of the rubber ring 30 located in the joint space 5 between the existing pipe 1 and the new pipe 2, and the thermopipe 12 can maintain the hermeticity in the joint space 5 between the existing pipe 1 and the new pipe 2.

[0036] Furthermore, when the housing 15 is tightened, the rubber ring 30 in the housing 15 is compressed, and the thermopipe 12 is clamped between the inner portion 31 of the rubber ring 30 and the core pipe 11. At the same time, the inner portion 31 of the rubber ring 30 expands in the axial direction L within the joint space 5. This causes the inner portion 31 of the rubber ring 30 to abut against both the end face 1b of the existing pipe 1 and the end face 2b of the new pipe 2. By having the inner portion 31 of the rubber ring 30 abut against the end face 1b of the existing pipe 1 and the end face 2b of the new pipe 2 in this manner, the inner portion 31 of the rubber ring 30 can further improve the sealing of the joint space 5 between the existing pipe 1 and the new pipe 2.

[0037] Next, the housing 15 will be described with reference to Fig. 3. The housing 15 is split into two parts, a divided part 15A and a divided part 15B. Each divided part 15A, 15B includes a pair of bolt attachment parts 21, 21.

[0038] When assembling the housing 15, the two divided parts 15A and 15B are placed outside the rubber ring 30. Next, the divided parts 15A and 15B are aligned so that the bolt attachment portions 21, 21 of the divided parts 15A and 15B face each other.

[0039] Thereafter, the mounting bolt 22 is inserted into the bolt mounting portions 21, 21 of the divided parts 15A and 15B, and the mounting bolt 22 is tightened with the nut 23. This allows the housing 15 consisting of the divided parts 15A and 15B to be installed on the outer surfaces of the existing pipe 1 and the new pipe 2. In this embodiment, the mounting bolt 22 and the nut 23 form a fastening means for tightening the divided parts 15A and 15B of the housing 15 together.

[0040] 1, outer protrusions 16, 16 are provided at both ends of the housing 15, and inner protrusions 17, 17 are provided on the inner surface of the housing 15. A storage space 20 for storing an outer portion 32 of the rubber ring 30 is formed within the inner protrusions 17, 17 of the housing 15.

[0041] Furthermore, an N ring 3 is provided on the outer surface of the existing pipe 1, and this N ring 3 is disposed between the protrusions 16 and 17. This N ring 3, together with the protrusions 16 and 17, prevents the existing pipe 1 from slipping out of the housing 15. Furthermore, an N ring 4 is provided on the outer surface of the new pipe 2, and this N ring 4 is disposed between the protrusions 16 and 17. This N ring 4, together with the protrusions 16 and 17, prevents the new pipe 2 from slipping out of the housing 15.

[0042] Next, the operation of this embodiment having such a configuration, that is, a method of assembling the piping joint structure, will be described with reference to FIGS. 5A to 5D and 6. FIG.

[0043] First, the ground is excavated to expose the existing pipe 1 to the atmosphere, and the existing pipe 1 is cut at a predetermined location to form an end 1a on the existing pipe 1 (see FIG. 6).

[0044] Next, the thermopipe 12 is inserted into the existing pipe 1 from the end 1a. After that, high-pressure steam is supplied into the existing pipe 1, causing the thermopipe 12 to expand along the inner surface shape of the existing pipe 1. Then, by continuing to hold high-pressure steam inside the existing pipe 1 for a predetermined time, the thermopipe 12 is tightly attached to the existing pipe 1, and thus the thermopipe 12 can be attached to the existing pipe 1. In this case, the thermopipe 12 protrudes slightly outward from inside the existing pipe 1 via the end 1a (see FIG. 5A).

[0045] Next, as shown in Figure 5B, the core pipe 11 is inserted into the existing pipe 1 from its end 1a. At this time, since the core pipe 11 is provided with a stopper 11b, the stopper 11b of the core pipe 11 engages with the end of the thermopipe 12. This allows the core pipe 11 to be accurately positioned in the axial direction relative to the thermopipe 12 within the existing pipe 1. At this time, the thermopipe 12 and the core pipe 11 protrude outward from the end 1a of the existing pipe 1 by approximately the same amount.

[0046] 5C, a rubber ring 30 is inserted into the end 1a of the existing pipe 1. Next, the end 2a of the new pipe 2 is joined to the end 1a of the existing pipe 1, leaving a gap (jointing space) for the rubber ring 30 to fit into. At this time, the thermopipe 12 and core pipe 11 protruding from the end 1a of the existing pipe 1 are arranged along the inner surface of the new pipe 2.

[0047] 5D, the two split parts 15A and 15B of the housing 15 are placed on the outer periphery of the rubber ring 30. Next, the positions of the split parts 15A and 15B are aligned so that the bolt attachment parts 21, 21 of the split parts 15A and 15B face each other.

[0048] Next, the mounting bolt 22 is inserted into the bolt mounting portions 21, 21 of the divided parts 15A and 15B, and the mounting bolt 22 is tightened with a nut 23. This allows the housing 15 consisting of the divided parts 15A and 15B to be installed on the outer surfaces of the existing pipe 1 and the new pipe 2, thus obtaining a piping joint structure (see Figures 1 and 2).

[0049] As described above, according to this embodiment, the thermopipe 12 extends from the inner surface of the existing pipe 1 through the joint space 5 to the inner surface of the new pipe 2. Therefore, when the housing 15 is tightened, the thermopipe 12 can reliably seal the joint space 5 between the existing pipe 1 and the new pipe 2.

[0050] Furthermore, when the housing 15 is tightened, the thermopipe 12 is sandwiched between the first uneven structure 11a of the core pipe 11 and the second uneven structure 31a of the inner portion 31 of the rubber ring 30. Therefore, the joint space 5 between the existing pipe 1 and the new pipe 2 can be reliably sealed by the rubber ring 30 and the thermopipe 12.

[0051] In this case, the thermopipe 12 is sandwiched between the first uneven structure 11a of the core pipe 11 and the second uneven structure 31a of the inner portion 31 of the rubber ring 30, so that the thermopipe 12 is firmly held between the core pipe 11 and the rubber ring 30. As a result, even when the thermopipe 12 shrinks more than the existing pipe 1 and the new pipe 2 due to environmental changes, particularly a drop in temperature, the thermopipe 12 does not retract into the existing pipe 1, and as a result, the joining space 5 between the existing pipe 1 and the new pipe 2 can be reliably sealed by the thermopipe 12.

[0052] Furthermore, when the housing 15 is tightened, the rubber ring 30 in the housing 15 is compressed, and accordingly, the inner portion 31 of the rubber ring 30 expands in the axial direction L within the joint space 5. In this case, the inner portion 31 of the rubber ring 30 abuts against both the end face 1b of the existing pipe 1 and the end face 2b of the new pipe 2. This allows the inner portion 31 of the rubber ring 30 to more reliably seal the joint space 5 between the existing pipe 1 and the new pipe 2.

[0053] Furthermore, when the core pipe 11 is inserted into the existing pipe 1 from the end 1a with the thermopipe 12 protruding from the end 1a of the existing pipe 1, the stopper 11b of the core pipe 11 engages with the end of the thermopipe 12. This allows the core pipe 11 to be positioned relative to the thermopipe 12. At this time, the length L1 of the core pipe 11 from the center part 30a of the rubber ring 30 to the end on the existing pipe 1 side is approximately the same as the length L2 from the center part 30a of the rubber ring 30 to the end on the newly installed pipe 2 side. As a result, when the housing 15 is tightened, the thermopipe 12 is sandwiched between the rubber ring 30 and the core pipe 11, and in this case, the center part 30a of the rubber ring 30 is located at a position corresponding to the center part 11c of the core pipe 11. Therefore, when the housing 15 is tightened, the core pipe 11 does not tilt inside the existing pipe 1 and the new pipe 2, and the thermopipe 12 can be clamped in a stable position between the rubber ring 30 and the core pipe 11.

[0054] According to the present embodiment, the piping joint structure can be easily and simply assembled. In this case, the assembly work space required for assembling the piping joint structure can be kept small, and the number of parts required for the assembly work can be reduced. [Explanation of symbols]

[0055] 1 Existing pipes 1a end 1b End face 2. New Pipes 2a end 2b End face 3 N-Ring 4 N-Ring 5 Joint space 10 Pipe joint structure 11 Core Pipe 11a First uneven structure 11b Stopper 11c central part 12 Thermopipe 12a Polyurethane layer 12b Meshed polyester core layer 12c polyurethane layer 15 Housing 15A split part 15B Split part 16,17 protrusion 20 Storage space 21 Bolt mounting part 22 Mounting bolt 23 Nut 30 Rubber Ring 30a central part 31 Inner part 31a Second uneven structure 32 Outer part

Claims

1. In the piping joint structure, An existing pipe with a thermopipe on the inside, A new pipe is disposed at an end of the existing pipe via a joint space; A core pipe extending from an inner surface of the existing pipe to an inner surface of the new pipe; A housing provided to cover the outside of the existing pipe and the new pipe; a rubber ring provided in the housing and inserted into the joining space; The thermopipe extends from the inner surface of the existing pipe through the joint space to the inner surface of the new pipe, and the thermopipe is sandwiched between a rubber ring located in the joint space and the core pipe.

2. 2. The pipe joint structure according to claim 1, wherein the rubber ring has an inner portion that fits into the joint space and an outer portion that is located radially outward of the inner portion, the inner portion filling the joint space and sealing the joint space.

3. 3. A piping joint structure as described in claim 2, wherein a first uneven structure is formed on an outer surface of the core pipe, a second uneven structure is formed on an inner surface of an inner portion of the rubber ring, and the thermopipe is sandwiched between the first uneven structure and the second uneven structure.

4. 3. The pipe joint structure according to claim 2, wherein an inner portion of the rubber ring abuts against end faces of the existing pipe and the new pipe.

5. 2. A piping joint structure as described in claim 1, wherein the core pipe extends the same length along the axial direction toward the inner surface of the existing pipe and the inner surface of the new pipe, centered on the central portion of the rubber ring, and a stopper is provided at the end of the core pipe on the new pipe side to engage with the end of the thermo pipe.

6. preparing an existing pipe; a step of installing a thermopipe on the inner surface of the existing pipe and protruding the thermopipe outward from an end of the existing pipe; inserting a core pipe into the existing pipe from an end of the existing pipe and protruding the core pipe outward from the end of the existing pipe; placing a rubber ring on an end of the existing pipe; a step of placing a new pipe on the end of the existing pipe via the rubber ring, and placing a thermo pipe and a core pipe protruding from the end of the existing pipe on an inner surface of the new pipe; a step of placing divided portions of a housing on an outer periphery of the rubber ring and fastening each divided portion with a fastening means.

Images