Inner layer structure of the tube

Abstract

To provide an inner layer structure of a pipe that can simplify the structure of an inner surface material by not using an inner material connecting material, does not require large force to engage an inner material, improve workability, and can absorb dimensional errors caused by bending or the like of an existing pipe to reliably connect inner materials.SOLUTION: An inner surface material 4 has a long band shape in a pipe axial direction of a pipe 1, and covers an inner surface of the pipe 1 by arranging the inner surface material 4 having a same cross-sectional shape in a pipe circumferential direction and fixing the inner surfaces to an inner surface material fixing member 3. The inner surface material comprises: an engaged part 41 that is engaged with the inner surface material 4 on one end side at one end in a pipe circumferential direction; a fixed part 42 that is fixed to an inner surface material fixing mechanism 31 of the inner surface material fixing member 3 at the center in the pipe circumferential direction; and an engagement part 43 that engages with the inner surface material 4 on the other end side at the other end in the pipe circumferential direction. At least one groove part 44 configured to be continuous in a pipe axis direction is provided on a surface of the inner surface material 4 on a pipe center side of the pipe 1.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an inner layer structure of a pipe in which an inner surface material is lined on the inner peripheral surface side of the pipe for, for example, repairing an existing pipe or finishing the inner surface of a newly installed pipe. [Background technology]

[0002] Conventionally, many repair structures for existing pipes such as aging sewerage pipes have been proposed in which the inner surface of the existing pipe is completely covered with a lining material (see, for example, Patent Documents 1 and 2). Of these, the one described in Patent Document 1 is constructed using a flow channel facility repair block body, which is made of plastic and has an inner surface plate that forms the inner surface and an outer surface plate that stands on the periphery of the inner surface plate, which are assembled to form a tubular, square, or horseshoe-shaped cylindrical body. Also, the one described in Patent Document 2 is constructed in such a way that a hollow frame-like reinforcing material is placed inside the existing pipeline, roughly following the inner surface of the existing pipeline, and a plurality of inner surface members are attached continuously inside the reinforcing material in the tubular length direction and circumferential direction of the existing pipeline, and assembled into a cylindrical shape, and the inner surface members that are adjacent in the tubular length direction of the existing pipeline are connected to each other with inner surface member connecting members that are placed across both inner surface members, with their end faces abutting each other, and a hardening filler material is filled between the inner surface member and the inner surface of the existing pipeline.

[0003] However, the system described in Patent Document 1 requires expensive molds to use blocks made of synthetic resin, which is costly and requires a great deal of effort to assemble a large number of blocks. Furthermore, the system described in Patent Document 2 solves problems such as transportation and manufacturing equipment issues and installation space issues at manufacturing sites when using inner surface members and fitting members that are continuous in the tube length direction as the repair length of the existing pipeline increases, but the hollow frame-like reinforcing member is made up of many parts and requires a great deal of effort to assemble within the existing pipeline, and there are also many inner surface members, so it requires a great deal of effort to fasten them to the equally large number of fitting members.

[0004] In light of this situation, a repair structure for an existing pipe has been proposed that uses economical materials, simplifies installation by eliminating the labor required for assembly, and is durable for a long period even after the work is completed. The repair structure includes rigid rings arranged at predetermined intervals in the axial direction of the pipe around the circumferential direction of the inner surface of the existing pipe, rigid straight members having notches formed at predetermined intervals in the axial direction of the rigid rings so as to straddle the inside of the rigid rings, and strip-shaped synthetic resin inner members having ridges corresponding to the notches in the rigid straight members. The ridges of the synthetic resin inner members are fitted into the notches in the rigid straight members, so that the synthetic resin inner members are arranged one after the other around the circumferential direction of the inner surface of the existing pipe and in the axial direction without gaps, and gaps formed between the existing pipe and the synthetic resin inner members are filled with a hardening filler (see, for example, Patent Document 3).

[0005] However, in the method described in Patent Document 3, the synthetic resin inner surface material is arranged circumferentially along the inner surface of the existing pipe, so the inner surface material cannot be arranged with high precision so as not to cause unevenness in the axial direction of the pipe, and there is a problem that the longer the length of the existing pipeline to be repaired, the more time and effort it takes to arrange the inner surface material.

[0006] In order to address this problem, the present applicants have proposed an inner layer structure for a pipe, as shown in Figures 1 and 2, which consists of skeletal members 2 installed at intervals in the pipe axial direction along the inner surface of the pipe 1, inner surface material fixing members 3 disposed on the skeletal members 2, and strip-shaped inner surface materials 4 installed between adjacent inner surface material fixing members 3 in the pipe axial direction (see Patent Document 4).

[0007] Furthermore, the present applicants have proposed an inner layer structure for a pipe using an inner surface member mounting framework structure shown in FIG. 3, which allows the inner surface member to be disposed accurately and simply (see Patent Document 5).

[0008] The pipe inner layer structures described in Patent Documents 4 and 5 enable the inner surface material to be positioned with high precision, while simplifying the installation work by eliminating the labor required for assembling components including the inner surface material, and provide a pipe inner layer structure that remains durable for a long period of time even after the work is completed. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-286742 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-310378 [Patent Document 3] Japanese Patent Application Laid-Open No. 2006-316539 [Patent Document 4] Patent No. 5746443 [Patent Document 5] Japanese Patent Application Publication No. 2017-198305 Summary of the Invention [Problem to be solved by the invention]

[0010] Incidentally, the inner layer structure of the pipe described in Patent Document 4 and Patent Document 5, as shown in Figures 1 to 3, comprises skeleton members 2 installed along the inner surface of the existing pipe 1 at intervals in the axial direction of the existing pipe 1, inner surface material fixing members 3 arranged on the skeleton members 2 and having fitted portions 31 into which the inner surface material 4 is fitted and fitting portions 32 for fitting to the skeleton members 2, and inner surface materials 4 fitted into the fitted portions 31 of the inner surface material fixing members 3 and installed on the skeleton members 2 adjacent to the existing pipe 1 in the axial direction, and construction is completed by injecting mortar 6 into the annular gap defined by the inner surface of the existing pipe 1 and the inner surface material 4 and allowing it to harden.

[0011] The inner surface materials 4 are connected via an inner surface material connecting material 5 with the two circumferential ends of the inner surface materials 4 adjacent to each other in the circumferential direction of the existing pipe 1 butted together (Figures 2(a) to (c), Figure 3(b)), or the inner surface materials 4 adjacent to each other in the circumferential direction of the existing pipe 1 are connected via engaging portions formed on the two circumferential ends of the inner surface materials 4 of the existing pipe 1 (Figure 2(d)), and a water-stopping material 7 is arranged at the connecting portions 40 of the inner surface materials 4 to stop water leaking through. Of these, the structure shown in Figure 2(d) does not use an inner material connecting member 5, which has the advantage of simplifying the structure of the inner material 4, but because the engaging portion is engaged by pinching from one side and the other in the circumferential direction of the pipe, a large force is required to engage the inner material, leaving room for improvement in terms of workability. Also, because the engaging portion and inner material 4 are integrated in the structure shown in Figure 2(d), it is difficult to follow the shape of the existing pipe 1 if it is bent, and in some cases the structures shown in Figures 2(a) to (c) and Figure 3(b), which use an inner material connecting member 5, are more rational.

[0012] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide an inner layer structure of a pipe that can simplify the configuration of the inner surface material by not using an inner surface material connecting material, and that can absorb dimensional errors caused by bending of existing pipes, etc., while improving workability by not requiring a large force to engage the inner surface material and securely connecting the inner surface materials together. [Means for solving the problem]

[0013] In order to achieve the above object, the inner layer structure of the pipe of the present invention is The inner surface of the pipe is provided with a predetermined interval in the circumferential direction and the axial direction of the pipe along the inner surface of the pipe, and the inner surface is provided with an inner surface fixing mechanism on the pipe center side. An inner layer structure of a pipe having an inner surface material that is set The inner surface material is a long strip in the axial direction of the pipe, and is formed by arranging inner surface materials of the same cross-sectional shape in the circumferential direction of the pipe and fixing them to the inner surface material fixing member so as to cover the inner surface of the pipe. an engaged portion at one end in the circumferential direction of the pipe, the engaged portion being engaged with the inner surface material at the one end; a fixed portion fixed to the inner surface material fixing mechanism at a central portion in the pipe circumferential direction; and an engaging portion at the other end in the pipe circumferential direction that engages with the inner surface material at the other end, At least one groove portion is provided on the surface of the inner surface material on the side of the pipe center, the groove portion being continuous in the pipe axial direction. It is characterized by:

[0014] In this case, the inner surface material fixing mechanism is a fitted portion provided on the pipe center side of the pipe, the fixed portion is a fitting portion that protrudes from a surface of the inner surface material on a circumferential side of the pipe and fits into the fitted portion, the inner surface material has a hollow portion located above the fitting portion, The hollow portion has a groove communicating with the surface of the inner surface material, thereby forming the groove portion.

[0015] Furthermore, a plurality of the fixed portions may be provided.

[0016] Furthermore, a first rib can be provided in the groove.

[0017] The engaged portion includes a water-stopping material installation portion, a water-stopping material, and an engaged claw protruding from the surface of the inner surface material, The engaging portion includes an engaging claw protruding from the rear surface of the inner surface material and a water-stopping material pressing portion, The engaging claw and the engaged claw of the inner surface material on the other end side engage with each other, The water-stopping material of the inner surface material on the other end side can be pressed by the water-stopping material pressing portion of the inner surface material.

[0018] Furthermore, the tip of the water-stop material pressing portion of the inner surface material may be provided with a second rib that projects in the circumferential direction of the pipe.

[0019] Furthermore, a third rib may be provided that projects from one end of the inner surface material in the circumferential direction of the pipe. [Effects of the Invention]

[0020] According to the pipe inner layer structure of the present invention, by using an inner surface material of a single structure without using an inner surface material connecting material, the structure of the inner surface material can be simplified, and no large force is required to engage the inner surface materials, improving workability, while the groove portion that continues in the pipe axis direction on the surface of the inner surface material facing the pipe center absorbs dimensional errors caused by bending of the existing pipe, etc., and allows the inner surface materials to be reliably connected to each other. [Brief explanation of the drawings]

[0021] [Figure 1] 1A and 1B show an example of the inner layer structure of a conventional pipe, where (a) is a cross-sectional view of the pipe, (b) is an enlarged view of the cross-sectional view of the pipe, and (c) is an enlarged view of the longitudinal section of the pipe. [Figure 2] The figure shows the assembled state of the same skeletal member, inner surface material fixing member, inner surface material and inner surface material connecting member, where (a) is an explanatory diagram of the cross-sectional direction of the pipe (skeletal member omitted), (b) is an explanatory diagram of the longitudinal cross-sectional direction of the pipe (inner surface material and inner surface material connecting member omitted), (c) is an explanatory diagram of the main parts of the cross-sectional direction of the pipe, and (d) is an explanatory diagram of the main parts of the cross-sectional direction of a different example of pipe. [Figure 3] 1A and 1B show a second example of the inner layer structure of a conventional pipe, in which (a) is a cross-sectional view of the pipe, and (b) is an enlarged view of the cross-sectional view of the pipe. [Figure 4] 1 is an explanatory diagram of a cross-sectional view of a pipe showing an embodiment of an inner surface material fixing member and an inner surface material of the inner layer structure of a pipe of the present invention in an assembled state. [Figure 5] 1A and 1B show the inner surface material, where (a) is an overall view and (b) is an enlarged view of part A in (a). DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the inner layer structure of a pipe according to the present invention will be described with reference to the drawings.

[0023] The inner layer structure of the pipe of the present invention has a basic structure similar to the inner layer structure of a conventional pipe shown in Figures 1 to 3, but by not using an inner layer connecting material, the structure of the inner layer can be simplified.

[0024] An embodiment of the inner layer structure of the pipe of the present invention is shown in FIGS.

[0025] <Explanation of the inner layer structure of the tube> The inner layer structure of the tube will be described below. The inner layer structure of this pipe is formed by laying a plurality of inner surface materials 4 extending in the pipe axis direction toward one side in the pipe circumferential direction while the ends of the inner surface materials 4 overlap each other, and the inner surface materials 4 are arranged at predetermined intervals in the pipe circumferential and axial directions of the pipe 1 so as to follow the inner surface of the pipe 1, and are provided with an inner surface material fixing member 3 equipped with an inner surface material fixing mechanism 31 on the pipe center side in the pipe diameter direction of the pipe 1, and inner surface materials 4 fixed to the inner surface material fixing mechanism 31.

[0026] Here, the inner surface material fixing member 3 is provided with fitting portions 32 for fitting into the skeletal members 2 installed at intervals in the axial direction of the pipe along the inner circumference of the pipe 1, similar to the inner layer structure of the conventional pipe shown in Figures 1 and 2.

[0027] Furthermore, in the case of this embodiment, similar to the inner layer structure of the conventional pipe shown in Figure 3, the inner surface material fixing member 3 has a structure that combines the function of holding the skeletal member 2 and the function of holding the inner surface material 4, and by grounding the bottom surface 33 of the inner surface material fixing member 3 to the inner surface of the pipe 1, the skeletal member 2 is made stable even when the inner surface material 4 is fitted into the inner surface material fixing member 3. In this case, it is not necessary to ground all of the inner surface material fixing members 3 to the inner peripheral surface of the pipe 1, and any position of the inner surface material fixing members 3 attached along the skeleton member 2 may be grounded within a range that allows the skeleton member 2 to be stabilized via the inner surface material fixing members 3. Note that the skeleton member 2 is not shown in Fig. 4.

[0028] The inner surface material 4 is a long strip in the axial direction of the pipe 1, and is made by arranging inner surface materials 4 of the same cross-sectional shape in the circumferential direction of the pipe and fixing them to the inner surface material fixing member 3 so as to cover the inner surface of the pipe 1.The inner surface material 4 has an engaged portion 41 at one end in the circumferential direction of the pipe that engages with the inner surface material 4 on the one end side, a fixed portion 42 at the center in the circumferential direction of the pipe that is fixed to the inner surface material fixing mechanism 31 of the inner surface material fixing member 3, and an engaging portion 43 at the other end in the circumferential direction of the pipe that engages with the inner surface material 4 on the other end side, and is configured by providing at least one groove portion 44 that is continuous in the axial direction of the pipe on the surface (surface) of the inner surface material 4 facing the center of the pipe 1. The engaging portion 43 of one inner surface material 4 and the engaged portion 41 of the adjacent inner surface material 4 are engaged to form an engaging portion.

[0029] This makes it possible to fix the inner surface material 4 to the inner surface material fixing member 3 inside the pipe 1 and to connect the inner surface materials 4 to each other using only the inner surface material 4, without using an inner surface material connecting member. In other words, by using an inner surface material 4 with a single structure, the structure of the inner surface material 4 can be simplified. Also, the work of engaging the inner surface material 4 does not require a large force, improving workability, and the grooves 44 continuous in the pipe axis direction provided on the surface (surface) of the inner surface material 4 on the pipe center side absorb dimensional errors resulting from bending of the pipe 1, the installation state (curvature) of the inner surface material 4, installation errors of the inner surface material fixing member 3, tolerances during manufacturing of the inner surface material 4, etc., and engage the engaged portion 41 with the engaging portion 43, The members 4 can be reliably connected to each other.

[0030] In this embodiment, the inner surface material fixing mechanism 31 of the inner surface material fixing member 3 is a fitting portion provided on the pipe center side of the pipe 1, and the fixed portion 42 of the inner surface material 4 that fits with this fitting portion is a fitting portion that protrudes from the surface (back surface) of the inner surface material 4 on the pipe circumferential side in the pipe diameter direction of the pipe 1 and fits with the fitting portion. The inner surface material 4 has a hollow portion located above the mating portion as the fixed portion 42 of the inner surface material 4, and this hollow portion 44a has a groove 44b that communicates with the surface of the inner surface material 4, thereby forming the groove portion 44.

[0031] A plurality of fixed portions 42 are provided on one inner surface member 4, two in this embodiment. This allows the inner surface material 4 to be attached to the inner surface material fixing member 3 in a stable manner.

[0032] The groove portion 44 is provided with a first rib 44c that covers part of the surface side of the inner surface material 4 of the hollow portion 44a, so that the portion not covered by the first rib 44c forms a groove 44b. This allows the groove portion 44 to have the function of guiding the guide member of the inner material fixing jig (not shown) used when fixing the inner material 4 to the inner material fixing mechanism 31 of the inner material fixing member 3, and the function of applying a reaction force.

[0033] The engaged portion 41 of the inner surface material 4 includes a waterproof material installation portion 45, a waterproof material 7, and an engaged claw 41a protruding from the surface of the inner surface material 4. The engaging portion 43 of the inner surface material 4 includes an engaging claw 43a protruding from the rear surface of the inner surface material 4, and a water-stop material pressing portion . The engaging claw 43a of the inner surface material 4 engages with the engaged claw 41a of the inner surface material 4 on the other end side, and the water-stopping material 7 of the inner surface material 4 on the other end side is pressed by the water-stopping material pressing portion 46 of the inner surface material 4. Here, as shown in Figs. 4 and 5, the engaged claw 41a has a rounded shape on the other end side. This allows the engaging claw 43a to engage without requiring a large force. In other words, in Fig. 4, the engaged claw 41a of the inner surface material 4 on the other end side guides the engaging claw 43a to a predetermined position. The water-stopping material 7 can be made of an elastomer material, particularly a water-expandable rubber material, which is compressed by being pressed by the water-stopping material pressing portion 46 and exhibits water-stopping properties. This allows the formation of a stronger inner layer structure, and allows the development of good water-stopping properties.

[0034] Furthermore, in this embodiment, the tip of the water-stopping material pressing portion 46 of the inner surface material 4 is provided with a second rib 46a protruding in the circumferential direction of the pipe, and in addition, a third rib 47 protruding in the circumferential direction of the pipe from one end side of the inner surface material 4 is provided. As a result, when mortar 6 is injected into the annular gap defined by the inner surface of pipe 1 and inner surface material 4 and hardened, second rib 46a and third rib 47 act as anchors, forming a stronger inner layer structure.

[0035] <Explanation of the method of laying the inner surface material that makes up the inner layer structure of the pipe> The method of laying the inner surface material that constitutes the inner layer structure of this pipe will be described below. First, the following step 1 is carried out. Step 1: The inner surface material 4 is laid by fitting the fitting portion as the fixed portion 42 of the inner surface material 4 to be laid first into the fitting portion as the inner surface material fixing mechanism 31 of the inner surface material fixing member 3. At this time, the fitted fixed portion 42 is only fitted on one end side, and the fixed portion 42 on the other end side is fixed in the step described later. Leave it unmated for 4. Next, an inner surface material 4 that engages with the inner surface material 4 that was laid first at one end side is laid in the following steps. Step 2: The fitting portion serving as the fixed portion 42 of the inner surface material 4 on one end side of the inner surface material 4 laid in the previous step is fitted into the fitting portion serving as the inner surface material fixing mechanism 31 of the inner surface material fixing member 3. Both of the two fixed portions 42 are fitted together. Step 3: The engaged portion 41 of the inner surface material 4 laid in the step before last is engaged with the engaging portion 43 of the inner surface material 4 laid in the previous step.

[0036] In this way, by fitting the inner surface material 4 and the inner surface material 4 on one end side into the inner surface material fixing member 3, the inner surfaces 4, 4 are positioned and then engaged with each other, thereby enabling the inner surfaces 4, 4 to be engaged with each other smoothly.

[0037] Subsequently, steps 2 and 3 are repeated toward one end side of the inner surface material 4. In other words, a plurality of inner surface materials 4 are laid circumferentially toward one side in the circumferential direction of the pipe (the one end side of the inner surface material 4 laid first) while the ends of the inner surface materials 4 overlap each other.

[0038] Finally, the last inner surface material 4 to be laid (the inner surface material 4 that engages with the other end side of the inner surface material 4 laid first) is laid in the following steps. Step 4: As in step 2 above, the fitting portion serving as the fixed portion 42 of the inner surface material 4 on the other end side is fitted into the fitting portion serving as the inner surface material fixing mechanism 31 of the inner surface material fixing member 3. Both of the two fixed portions 42 of the inner surface material 4 on the other end side are fitted together. At this time, the engaging portion 43 of the inner surface material 4 laid first is raised toward the pipe core, and the engaged portion 41 of the inner surface material 4 on the other end side is laid by sliding it downward (because the fixed portion 42 on the other end side of the inner surface material 4 laid first is not fitted as in step 1 above, the engaging portion 43 of the inner surface material 4 laid first can be easily raised). Step 5: The fixed portion 42 on the other end side of the inner surface material 4 laid first is fitted into the fitted portion serving as the inner surface material fixing mechanism 31 of the inner surface material fixing member 3. Step 6: As in step 3 above, the engaged portion 41 of the inner surface material 4 on the other end side is engaged with the engaging portion 43 of the inner surface material 4 laid first.

[0039] This eliminates the need for a large force in the operation of engaging the inner material 4, improving workability, and the groove portion 44 that continues in the pipe axis direction and is provided on the surface (surface) of the inner material 4 on the pipe center side of the pipe absorbs dimensional errors resulting from the bending of the pipe 1, the installation state (curvature) of the inner material 4, installation errors of the inner material fixing member 3, tolerances during manufacture of the inner material 4, etc., thereby engaging the engaged portion 41 with the engaging portion 43 and reliably connecting the inner materials 4 together.

[0040] The inner layer structure of the pipe of the present invention has been described above based on its examples, but the present invention is not limited to the configuration described in the above examples, and the configuration can be changed as appropriate within the scope of the invention. [Industrial Applicability]

[0041] The inner layer structure of the pipe of the present invention does not use an inner material connecting material, thereby simplifying the configuration of the inner material, and does not require a large force to engage the inner materials, improving workability while absorbing dimensional errors caused by bending of the existing pipe, etc., and allowing the inner materials to be securely connected to each other.Therefore, it can be suitably used for lining work of inner materials used when repairing existing pipes such as aging sewer pipes, and can also be used for lining work of inner materials used when finishing the inner surface of newly installed pipes, for example, and is particularly suitable for use when the inner material is made of synthetic resin. [Explanation of symbols]

[0042] 1 Pipe (existing pipe) 2. Frame members 3. Inner surface fixing member 31 Inner material fixing mechanism (mated part) 32 Fitting part 33 bottom 4 Inner surface material 41 engaged portion 41a Engaged claw 42 Fixed part 43 Engagement part 43a Engagement claw 44 Groove 44a Hollow part 44b Groove 44c First Rib 45 Water-stopping material installation section 46 Water-stop material pressing part 46a Second Rib 47 Third Rib 5 Internal material connection material 6. Mortar 7. Water-stopping materials

Claims

1. An inner layer structure of a pipe, comprising: inner surface material fixing members provided at predetermined intervals in the circumferential direction and the axial direction of the pipe along the inner surface of the pipe, the inner surface material fixing members having an inner surface material fixing mechanism on the pipe center side; and an inner surface material fixed to the inner surface material fixing mechanism, The inner surface material is a long strip in the axial direction of the pipe, and is formed by arranging inner surface materials of the same cross-sectional shape in the circumferential direction of the pipe and fixing them to the inner surface material fixing member so as to cover the inner surface of the pipe. an engaged portion at one end in the circumferential direction of the pipe, the engaged portion being engaged with the inner surface material at the one end; a fixed portion fixed to the inner surface material fixing mechanism at a central portion in the pipe circumferential direction; and an engaging portion at the other end in the pipe circumferential direction that engages with the inner surface material at the other end, At least one groove portion is provided on the surface of the inner surface material on the side of the pipe center, the groove portion being continuous in the pipe axial direction. The inner layer structure of the pipe is characterized by the following.

2. the inner surface material fixing mechanism is a fitted portion provided on the pipe center side, the fixed portion is a fitting portion that protrudes from a surface of the inner surface material on a circumferential side of the pipe and fits into the fitted portion, the inner surface material has a hollow portion located above the fitting portion, The hollow portion has a groove communicating with the surface of the inner surface material, thereby forming the groove portion.

2. The inner layer structure of a pipe according to claim 1.

3. 3. The pipe inner layer structure according to claim 1, wherein a plurality of the fixed portions are provided.

4. 4. The inner layer structure of a pipe according to claim 1, wherein a first rib is provided in the groove portion.

5. The engaged portion includes a water-stopping material installation portion, a water-stopping material, and an engaged claw protruding from the surface of the inner surface material, The engaging portion includes an engaging claw protruding from the rear surface of the inner surface material and a water-stopping material pressing portion, The engaging claw and the engaged claw of the inner surface material on the other end side engage with each other, The water-stopping material of the inner surface material on the other end side is pressed by the water-stopping material pressing portion of the inner surface material. The inner layer structure of a pipe according to any one of claims 1 to 4.

6. The inner layer structure of a pipe according to claim 5, characterized in that a tip of the water-stop material pressing portion of the inner surface material is provided with a second rib protruding in the pipe circumferential direction.

7. 7. The inner layer structure of a pipe according to any one of claims 1 to 6, further comprising a third rib projecting from one end of the inner surface material in the circumferential direction of the pipe.

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