JP7783103B2 - Inner layer structure of the tube - Google Patents

Description

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

Conventionally, many repair structures for existing pipes such as aging sewer 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 which has an inner surface plate that forms the inner circumferential surface and an outer circumferential plate that stands on the periphery of the inner surface plate, which are assembled to form a tubular, rectangular 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.

However, the system described in Patent Document 1 requires expensive molds because it uses 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 at the manufacturing site 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-shaped reinforcing members are made up of many parts, so placing them inside the existing pipeline requires a great deal of effort to assemble. Furthermore, there are many inner surface members, so it requires a great deal of effort to fasten them to the equally large number of fitting members.

In light of this situation, a repair structure for existing pipes has been proposed that uses economical materials, simplifies installation by eliminating assembly labor, and remains durable for a long period even after completion. The structure includes rigid rings arranged at predetermined intervals along the circumferential direction of the inner surface of the existing pipe at the axial direction; rigid straight members having notches formed at predetermined intervals toward the center of the existing pipe and arranged at predetermined intervals along 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 on the synthetic resin inner members are fitted into the notches in the rigid straight members, thereby sequentially arranging the synthetic resin inner members circumferentially along the axial direction of the inner surface of the existing pipe without gaps, and filling any gaps that occur between the existing pipe and the synthetic resin inner members with a hardening filler (see, for example, Patent Document 3).

However, with the system described in Patent Document 3, the synthetic resin inner surface material is arranged circumferentially along the inner surface of the existing pipe, making it impossible to arrange the inner surface material with high precision to avoid creating unevenness in the axial direction of the pipe, and there is a problem in that the longer the length of the existing pipeline to be repaired, the more time-consuming it becomes to arrange the inner surface material.

To address this issue, 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 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 axial direction of the pipe (see Patent Document 4).

Furthermore, the present applicants have proposed an inner layer structure for a pipe, as shown in Figure 3, that uses an inner layer mounting framework structure for precisely and easily arranging the inner layer (see Patent Document 5).

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 process by eliminating the labor required to assemble components, including the inner surface material, and providing a pipe inner layer structure that remains durable for a long period of time even after the installation process is completed.

Japanese Patent Application Laid-Open No. 2003-286742 Japanese Patent Application Laid-Open No. 2002-310378 Japanese Patent Application Laid-Open No. 2006-316539 Patent No. 5746443 Japanese Patent Application Laid-Open No. 2017-198305

As shown in Figures 1 to 3, the pipe inner layer structure described in Patent Documents 4 and 5 comprises: skeletal 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 disposed on the skeletal members 2; fitted portions 31 into which the inner surface material 4 is fitted and fitting portions 32 for fitting to the skeletal 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 skeletal members 2 adjacent to the existing pipe 1 in the axial direction. 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.

The inner surface materials 4 are connected via an inner surface material connecting material 5 with both circumferential ends of the inner surface materials 4 adjacent to each other in the circumferential direction of the existing pipe 1 butted together (Figs. 2(a) to (c), Fig. 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 both circumferential ends of the inner surface materials 4 of the existing pipe 1 (Fig. 2(d)), and a water-stopping material 7 is disposed 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 the 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 side in the pipe circumferential direction, a large force is required to engage the inner material, and there is room for improvement in terms of workability. Also, in the structure shown in Figure 2(d), because the engaging portion and the inner material 4 are integrated, 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 the inner material connecting member 5, are more rational.

The present invention was made in consideration of these circumstances, and aims to provide an inner layer structure for pipes that simplifies the construction of the inner layer by eliminating the use of inner layer connecting members, and that does not require a large force to engage the inner layer members, improving workability while absorbing dimensional errors caused by bending of existing pipes, etc., and enabling inner layer members to be securely connected to each other.

In order to achieve the above object, the inner layer structure of the pipe of the present invention is
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,
The present invention is characterized in that at least one continuous groove portion is provided in the pipe axial direction on the surface of the inner surface material on the pipe center side.

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.

Furthermore, multiple fixed portions can be provided.

A first rib can also be provided in the groove.

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.

In addition, the tip of the water-stopping material pressing portion of the inner surface material can be provided with a second rib that protrudes circumferentially in the pipe direction.

A third rib may also be provided that protrudes circumferentially from one end of the inner surface material.

The pipe inner layer structure of the present invention uses a single-structure inner layer without an inner layer connecting member, simplifying the structure of the inner layer. It also eliminates the need for a large force when engaging the inner layers, improving workability. Meanwhile, the grooves running in the axial direction on the inner layer's surface toward the center of the pipe absorb dimensional errors caused by bending of the existing pipe, allowing the inner layers to be securely connected together.

1A and 1B show an example of the inner layer structure of a conventional pipe, in which (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. The figures show 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 pipe. 1A and 1B show a second example of the inner layer structure of a conventional pipe, in which FIG. 1A is a cross-sectional view of the pipe, and FIG. 1B is an enlarged view of the cross-section of the pipe. 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. 1A and 1B show the inner surface material, where FIG. 1A is an overall view and FIG. 1B is an enlarged view of part A in FIG.

Below, an embodiment of the inner layer structure of the pipe of the present invention will be explained based on the drawings.

The inner layer structure of the pipe of the present invention has the same basic structure as the inner layer structure of conventional pipes shown in Figures 1 to 3, but by not using inner layer connecting members, the structure of the inner layer can be simplified.

One example of the inner layer structure of the pipe of the present invention is shown in Figures 4 and 5.

<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 inner surface material fixing members 3 equipped with inner surface material fixing mechanisms 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 mechanisms 31.

Here, the inner surface material fixing member 3 has fitting portions 32 for fitting into the framework 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.

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 in which it has both 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.

The inner surface material 4 is a long strip in the axial direction of the pipe 1, and is formed 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.At least one groove portion 44 that is continuous in the axial direction of the pipe is provided 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 with each other to form an engaging portion.

As a result, the inner surface material 4 can be fixed to the inner surface material fixing member 3 inside the pipe 1 and the inner surface materials 4 can be connected to each other using only the inner surface material 4, without using an inner surface material connecting member. In other words, the use of an inner surface material 4 with a single structure simplifies the configuration of the inner surface material 4. Furthermore, the work of engaging the inner surface materials 4 does not require a large force, improving workability, and the grooves 44 continuous in the pipe axial direction provided on the surface (surface) of the inner surface material 4 facing the pipe center 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., thereby engaging the engaged portions 41 and the engaging portions 43 and reliably connecting the inner surface materials 4 to each other.

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 which serves as the fixed portion 42 of the inner surface material 4, and this hollow portion 44a has a groove 44b which communicates with the surface of the inner surface material 4, thereby forming the groove portion 44.

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 stably attached to the inner surface material fixing member 3.

The groove portion 44 is provided with a first rib 44c that covers a portion 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 is formed as 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.

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 41 a protruding from the surface of the inner surface material 4 .
The engaging portion 43 of the inner surface material 4 includes an engaging claw 43 a protruding from the rear surface of the inner surface material 4 and a water-stop material pressing portion 46 .
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 Figures 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 Figure 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.

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 that protrudes in the circumferential direction of the pipe, and in addition, a third rib 47 that protrudes 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 the pipe 1 and the inner surface material 4 and hardened, the second rib 46a and the third rib 47 act as anchors, forming a stronger inner layer structure.

<Explanation of the method of laying the inner surface material that constitutes 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 fixed portion 42 to be fitted is only on one end side, and the fixed portion 42 on the other end side is left unfitted for step 4 described below.
Next, an inner surface material 4 that engages with the first-laid inner surface material 4 at one end 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.

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, allowing the inner surfaces 4, 4 to be smoothly engaged with each other.

Next, steps 2 and 3 are repeated toward one end of the inner surface material 4. In other words, multiple inner surface materials 4 are laid circumferentially toward one side of the pipe circumference (the end side of the inner surface material 4 laid first), with the ends of the inner surface materials 4 overlapping each other.

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 slid downward when laid (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.

This eliminates the need for a large force when engaging the inner surface material 4, improving workability. Furthermore, the grooves 44 running continuously in the axial direction of the pipe on the surface (surface) of the inner surface material 4 facing the pipe's center absorb dimensional errors resulting from factors such as the bending of the pipe 1, the installation condition (curvature) of the inner surface material 4, installation errors in the inner surface material fixing member 3, and tolerances during the manufacture of the inner surface material 4, thereby engaging the engaged portions 41 and engaging portions 43 and reliably connecting the inner surface materials 4 together.

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

The pipe inner layer structure of the present invention does not use an inner layer connecting member, thereby simplifying the configuration of the inner layer. It also does not require a large force to engage the inner layers, improving workability while absorbing dimensional errors caused by bending of the existing pipe and reliably connecting the inner layers. Therefore, it is suitable for use in lining the inner layers used when repairing existing pipes such as aging sewer pipes. It can also be used, for example, for lining the inner layers used when finishing the inner surface of newly installed pipes, and is particularly suitable for use when the inner layer is made of synthetic resin.

1 Pipe (existing pipe)
2 Skeleton member 3 Inner surface material fixing member 31 Inner surface material fixing mechanism (fitted portion)
32 Fitting portion 33 Bottom surface 4 Inner surface material 41 Engaged portion 41a Engaged claw 42 Fixed portion 43 Engaging portion 43a Engaging claw 44 Groove portion 44a Hollow portion 44b Groove 44c First rib 45 Water-stopping material installation portion 46 Water-stopping material pressing portion 46a Second rib 47 Third rib 5 Inner surface material connecting material 6 Mortar 7 Water-stopping material

Claims (7)

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,
An inner layer structure of a pipe, characterized in that at least one continuous groove portion is provided in the pipe axial direction on the surface of the inner surface material facing the pipe center. 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 inner layer structure of a pipe according to claim 1, wherein the hollow portion has a groove communicating with the surface of the inner surface material, thereby forming the groove portion. The inner layer structure of a pipe described in any one of claims 1 and 2, characterized in that multiple fixed portions are provided. The inner layer structure of a pipe described in any one of claims 1 to 3, characterized in that a first rib is provided in the groove portion. 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 inner layer structure of a pipe according to any one of claims 1 to 4, characterized in that the water-stopping material of the inner surface material on the other end side is pressed by a water-stopping material pressing portion of the inner surface material. The inner layer structure of a pipe as described in claim 5, characterized in that the tip of the water-stopping material pressing portion of the inner surface material is provided with a second rib protruding in the pipe circumferential direction. The inner layer structure of a pipe described in any one of claims 1 to 6, characterized in that it is provided with a third rib protruding circumferentially from one end of the inner surface material.