JP7224007B1 - Duct manhole, pipe joint structure at pipe end, joint element for pipe and pipe construction method - Google Patents

Abstract

[Issue] There is a technical problem that there may be a difference in the crimping of the joint and the connecting member, and it is difficult to prevent water from entering the joint because the pipe port and the connecting member cannot be made of the same material. In order to solve technical problems, we provide pipe connection structures, pipe joint elements, and pipe construction methods for pipes that have water-stop properties and durability. [Solution] A manhole and a pipe conduit connection structure at the end of the pipe, which includes an injection material layer that covers the wall surface of the manhole, a liner that covers the surface of the injection material layer, and a joint element. , an outer film, an intermediate layer, and an inner film of thermoplastic resin are provided on the joint element in which the heating wire is embedded, the input terminal of the external power source, the inner surface of the pipe, and the inner wall surface of the joint element from the outside. A pipe conduit joint structure, a joint element for a pipe conduit, and a pipe conduit construction method, which have a multilayer structure, one surface of the intermediate layer is covered with an outer film, and the other surface of the intermediate layer is covered with an inner film. [Selection diagram] Figure 1

Description

TECHNICAL FIELD The present invention relates to a manhole for a culvert, a culvert connection structure at the end of a culvert, a joint element for a culvert, and a construction method for a culvert.

As of the end of 2020, the total length of sewage pipes nationwide was about 490,000 km, of which the length of pipes that had passed the standard service life of 50 years was about 25,000 km (5% of the total length). ).
These existing sewers have deteriorated over many years, land subsidence, and have deteriorated significantly due to increased traffic loads. Water leakage accidents, road subsidence, odor problems, etc., which are thought to be caused by damage to the sewers, have occurred frequently. .
Aging pipes that have passed the standard service life and need to be rehabilitated will reach 82,000 km (17% of the total length) in 10 years, and 190,000 km (39% of the total length) in 20 years. It is known that it will increase, and it is necessary to carry out planned maintenance and reconstruction in order to secure sustainable sewerage functions.

In addition, as of the end of FY2020, about 1,300 of the approximately 1,600 rainwater pumping stations nationwide have exceeded their standard service life of 20 years. (81% of the total).

In addition, there are many cases where the amount of sewage, including the amount of infiltration during rainy weather, exceeds the processing capacity of sewerage facilities due to rising groundwater levels due to typhoons and sudden torrential rains. Infiltration during rainy weather has been treated as a temporary phenomenon associated with rainfall for many years, and has not been sufficiently considered in facility planning.

However, in recent years, the increase in the amount of water has become a problem. Due to the increase in the amount of infiltration, problems such as flooding from sewage pipes, backflow into homes, and the impact on public water areas due to the deterioration of treatment facilities are required, and measures against infiltration are required.

Patent Literature 1 discloses a method of connecting pipes and culverts for joints between manholes and pipes, and a method of rehabilitating deteriorated pipes and culverts. A method of crimping connecting members with a thermosetting or photocurable liner is described.
Patent Literature 1 describes that a liner is crimped to a connecting member during construction of an existing pipe. There is no recognition of the problem that the thickness of the liner and the method of crimping can cause differences in crimping between the joint and the connecting member.
In the construction method described in Patent Document 1, if the thickness of the lining material is reduced, it is not possible to obtain a liner with sufficient strength, and the strength of the joint and the connecting member decreases, preventing water from entering. was difficult.

Patent Literature 2 discloses a joint element used when rehabilitating pipes and a method of manufacturing the same. However, it is not recognized that there may be a difference in crimping between the connecting portion and the connecting member depending on the thickness of the liner and the crimping method. It was not possible to obtain a liner having sufficient strength, and the strength of the connecting portion and the connecting member was not stable.

Special table 2022-509049 Special table 2020-506349

The present invention solves the technical problem that there may be a difference in crimping of the connecting member at the joint of the duct and the manhole, and a liner with sufficient strength can be obtained by reducing the thickness of the lining material. Therefore, the strength of the joint and the connecting member is not stable. As a result, since the pipe mouth and the connecting member cannot be integrated with the same material, damage occurs due to insufficient strength, etc., and it is difficult to prevent water from entering the pipe. It is a thing. An object of the present invention is to provide a pipe connection structure for a pipe and culvert, a joint structure for pipe and culvert, a joint structure for pipe and culvert, a joint element for pipe and a pipe construction method using the same. do.

The invention according to claim 1 is a manhole for a pipe and a pipe-and-drain joint structure of a pipe-and-drain joint, wherein the pipe and sewage joint structure comprises an injection material layer covering the wall surface of the manhole, a liner covering the surface of the injection material layer; a joint element provided at the joint portion and having a heating wire embedded therein; an input terminal for an external power source for the heating wire; A multilayer structure including an outer film of a thermoplastic resin, an intermediate layer and an inner film is formed on the surface and the inner wall surface of the joint element from the surface side, one surface of the intermediate layer is covered with the outer film, The present invention relates to a conduit connection structure characterized in that an inner film is covered by the other surface of an intermediate layer.

The invention according to claim 2 is characterized in that the joint element comprises a sleeve-shaped portion formed around the outer periphery of the connecting portion between the manhole and the canal, and the thickness of the sleeve-shaped portion is at least equal to or greater than the thickness of the canal. The pipe connection structure according to claim 1, characterized in that a covering portion is provided on the outer periphery of the sleeve-shaped portion.

The invention according to claim 3 relates to the pipe connection structure according to claim 1, wherein the intermediate layer is made of one or more selected from the group consisting of glass fibers and synthetic resin compositions.

The invention according to claim 4 relates to the pipe and culvert connection structure according to claim 1, characterized in that the injection material layer contains at least mortar.

The invention according to claim 5 relates to the pipe connection structure according to any one of claims 1 to 4, wherein the liner covering the surface of the injection material layer contains polyethylene resin as a main component.

The invention according to claim 6 relates to the pipe connection structure according to claims 1 to 5, wherein the joint element in which the heating wire is embedded contains polyethylene resin as a main component.

The invention according to claim 7 is characterized in that the joint element comprises a sleeve-shaped portion formed around the outer periphery of the connecting portion between the manhole and the end of the pipe, and the thickness of the sleeve-shaped portion is at least the thickness of the pipe. In addition to the above, a covering portion is provided on the outer circumference of the sleeve-shaped portion, a heating wire is embedded in the pipe and the sleeve-shaped portion, and the heating wire is provided with an input terminal for an external power supply. It relates to a joint element for a conduit, characterized by:

The invention according to claim 8 relates to the joint element for pipe and culvert according to claim 7, wherein the joint element in which the heating wire is embedded contains polyethylene resin as a main component.

The invention according to claim 9 is a pipe and culvert construction method for constructing a pipe and culvert connection structure of a pipe manhole and a pipe mouth at the end of the pipe and culvert, wherein the pipe and culvert connection structure an injection material layer covering the wall surface of the hole ; a liner covering the surface of the injection material layer; A multilayer structure including an outer film, an intermediate layer and an inner film made of a thermoplastic resin is formed on the surface and the inner surface of the joint element from the outside, one surface of the intermediate layer is covered with the outer film, and the intermediate film is covered with the outer film. The inner film is covered by the other surface of the layer, and the culvert construction method includes the steps of (A) removing a cesspool provided in the culvert, and (B) after step (A), the person (C) after step (B), covering the potting material layer with a liner; (D) after step (C), covering the liner and and a step of heating and welding the joint element to the joint by applying power from an external power source to the heating wire embedded in the joint element, and (E) the welded joint after the step (D) The inner wall of the culvert connected to the element and the joint element is lined, and an outer film of thermoplastic resin is attached to the inner surface of the culvert and the inner wall surface of the joint element via the intermediate layer and the inner film. and (F) lining the inside of the pipe after step (E), then heating the heating wire embedded in the joint element, and forming an outer film on the inner wall surface of the joint element. and (G) after step (F), removing the inner film covering the inner walls of the pipe and the joint element after the liner is cured.

The invention according to claim 10 is characterized in that the joint element comprises a sleeve-shaped portion formed around the outer periphery of the connecting portion between the manhole and the canal, and the thickness of the sleeve-shaped portion is at least equal to or greater than the thickness of the canal. and a covering portion is provided on the outer periphery of the sleeve-shaped portion.

The invention according to claim 11 relates to the pipeline construction method according to claim 9, wherein the intermediate layer is made of one or more selected from the group consisting of glass fibers and synthetic resin compositions.

The invention according to claim 12 relates to the pipe and culvert construction method according to claim 9, wherein the grout layer covering the wall surface of the manhole contains at least mortar.

The invention according to claim 13 relates to the pipe and culvert construction method according to claim 9, wherein the liner covering the surface of the injection material layer contains polyethylene resin as a main component.

The invention according to claim 14 relates to the pipeline construction method according to claim 9, wherein the joint element in which the heating wire is embedded contains polyethylene resin as a main component.

According to the first aspect of the invention, there is provided a joint structure between a manhole for a pipe and a pipe mouth at an end of the pipe, wherein the joint structure includes an injection material layer covering the wall surface of the manhole. , a liner covering the surface of the injection material layer; a joint element provided in the joint structure, the joint element having a heating wire embedded therein; an input terminal of an external power source for the heating wire; and an inner wall surface of the joint element, a multilayer structure including an outer film, an intermediate layer, and an inner film made of thermoplastic resin is formed from the surface side, and one surface of the intermediate layer is covered with the outer film. and a pipe-and-drain joint structure in which an inner film is covered by the other surface of the intermediate layer.
The pipe joint structure, which is a feature of the present invention, is made by welding and integrating the outer film and the liner that covers the surface of the injection material layer with a joint element in which the heating wire is embedded, thereby preventing infiltration from the pipe mouth. Water can be reliably prevented, and there is no risk of water leakage.
Therefore, the pipe-and-drain joint structure according to claim 1 has the effect of being able to form a pipe-and-drain joint structure with excellent water cut-off properties at the mouth of the pipe.

According to the pipe joint structure according to claim 2, the joint element consists of the manhole and the sleeve-shaped portion formed on the outer periphery of the pipe joint portion, and the thickness of the sleeve-shaped portion is at least as large as that of the pipe joint. It is thicker than the sleeve-shaped portion and is characterized in that the covering portion is provided on the outer circumference of the sleeve-shaped portion. Since the outer film around the pipe mouth covered with the part is welded to the liner covering the surface of the injection material layer, it is possible to prevent water from entering from the pipe mouth.

According to the pipe and culvert connection structure according to claim 3, since the intermediate layer is made of one or more selected from the group consisting of glass fiber and synthetic resin composition, it has superior performance and high water resistance over a long period of time. can be maintained, it is possible to form an intermediate layer having high water resistance and durability on the inner peripheral surface of the culvert.

According to the pipe and culvert joint structure according to claim 4, since the injection material layer contains at least mortar, it is possible to maintain excellent load bearing performance and pressure resistance performance. Therefore, the grouting material has the effect of being able to form a pipe-and-drain joint structure with excellent load-bearing capacity.

According to the pipe and culvert connection structure according to claim 5, the liner covering the surface of the injection material layer is characterized by containing a polyethylene resin as a main component. It is possible to form a pipe-and-drain joint structure with about 30 times higher abrasion resistance and excellent chemical resistance.

According to the pipe and culvert joint structure according to claim 6, the joint element in which the heating wire is embedded is a pipe and culvert joint structure characterized by containing polyethylene-based resin as a main component, so that it has chemical resistance and wear resistance. It is possible to form a pipe and culvert connection structure with excellent properties.
Therefore, the pipe joint structure containing the polyethylene-based resin is highly durable, and has the effect of being able to prevent deterioration of the pipe for a long period of time.

According to the joint element for a conduit according to claim 7, the joint element comprises a manhole and a sleeve-shaped portion formed around the outer periphery of the connecting portion at the end of the conduit, and the thickness of this sleeve-shaped portion is Since the thickness is at least equal to or greater than the thickness of the culvert, the outer circumference of the sleeve-shaped portion is characterized by being provided with a covering portion. It is possible to form a culvert joint element that prevents intrusion of water.

According to the joint element for a conduit according to claim 8, the joint element in which the heating wire is embedded is a joint element for a conduit characterized by containing a polyethylene resin as a main component. It is possible to form a pipe-and-drain joint structure having excellent wear resistance and wear resistance.

According to the pipe and culvert construction method according to claim 9, there is provided a pipe and culvert construction method for constructing a manhole for a pipe and a pipe and culvert joint structure at the end of the pipe and culvert, wherein the pipe and culvert joint structure includes the A grouting material layer covering the wall surface of the manhole, a liner covering the surface of the grouting material layer , a joint element provided at the joint , the joint element having a heating wire embedded therein, and the pipe. A multilayer structure including an outer film, an intermediate layer and an inner film of thermoplastic resin is formed on the inner surface of the ditch and the inner surface of the joint element from the outside, and one surface of the intermediate layer is covered with the outer film. , the inner film is covered by the other surface of the intermediate layer, and the pipe and culvert construction method includes (A) a step of removing a sewage pit provided in the pipe and (B) after the step (A) (C) after step (B), covering the implant with a liner; (D) after step (C), after said a step of heating and welding the joint element to the liner and the joint portion by applying electric power from an external power source to the heating wire embedded in the joint element; and (E) welding after the step (D). In addition to the step of lining the joint element and the inner wall of the pipe coupled with the joint element, an outer film of thermoplastic resin is applied to the inner surface of the pipe and the inner wall surface of the joint element via the intermediate layer and the inner film. (F) after the step (E), the inside of the pipe is lined, then the heating wire embedded in the joint element is heated, and the heating wire is provided on the inner wall surface of the joint element. and (G) after step (F), removing the inner film covering the inner walls of the conduit and the joint element after the liner is cured. It is possible to form a pipe joint structure with excellent chemical resistance and abrasion resistance.
Therefore, by integrating these processes by welding with a heating wire, it is possible to form a pipe joint structure having excellent water cutoff properties at the pipe mouth of the pipe and culvert.

According to the pipe construction method according to claim 10, the joint element comprises the manhole, the sleeve-shaped portion formed on the outer periphery of the connecting portion at the end of the pipe, and the thickness of this sleeve-shaped portion is at least and the outer circumference of the sleeve-shaped portion is provided with a covering portion. The outer film around the covered pipe mouth and the liner covering the surface of the injection material layer are welded together to produce the effect of being able to prevent intrusion of water from the pipe mouth.

According to the pipe construction method according to claim 11, the intermediate layer is made of one or more selected from the group consisting of glass fiber and synthetic resin composition, so that superior performance and high water resistance are maintained over a long period of time. There is an effect that it can be done.
Therefore, the culvert construction method of the present invention can form an intermediate layer with high water cutoff and durability on the inner peripheral surface of the culvert.

According to the pipe and culvert construction method according to claim 12, since the grouting material layer contains at least mortar, there is an effect that excellent load bearing performance and pressure resistance performance can be maintained.

According to the pipe construction method according to claim 13, the liner covering the surface of the grouting material layer is characterized by containing a polyethylene-based resin as a main component. There is an effect that a bonding structure can be formed.

According to the pipe construction method according to claim 14, since the joint element in which the heating wire is embedded contains polyethylene resin as a main component, the pipe joint structure is excellent in chemical resistance and abrasion resistance. It is possible to form a working effect.

FIG. 4 is a diagram showing the process and structure of attaching an outer film to the cross section of the inner surface of the culvert and the inner surface of the joint element in one embodiment of the culvert construction method according to the present invention. 1 is a perspective view showing a joint element in which a heating wire is embedded in an embodiment of a pipe and culvert construction method according to the present invention; FIG. FIG. 2 is a diagram showing a step of removing a sewage basin from a sewer in an embodiment of the sewer construction method according to the present invention, before removing the sewage basin. FIG. 4 is a diagram showing a step of removing the sewage pit from the culvert in one embodiment of the culvert construction method according to the present invention, after removing the sewage pit. FIG. 4 is a diagram showing a step of covering the wall surface of a manhole with an injection material layer and then covering the injection material layer with a liner in one embodiment of the pipe and culvert construction method according to the present invention. FIG. 5 is a diagram showing a process of heating and welding the heating wire of the joint element to the liner and the joint by applying electric power from an external power supply in one embodiment of the pipe and culvert construction method according to the present invention. 1 is a perspective view showing a multilayer structure of a culvert including an outer film, an intermediate layer and an inner film of thermoplastic resin in one embodiment of the culvert construction method according to the present invention. FIG. In one embodiment of the pipe and culvert construction method according to the present invention, the inside of the pipe and culvert is lined, then the heating wire embedded in the joint element is heated, and the outer film and the intermediate layer provided on the inner wall surface of the joint element are heated. It is a figure which shows the process of welding.

DETAILED DESCRIPTION OF THE INVENTION A pipe joint structure, a joint element, and a pipe construction method for preventing infiltration of water into pipe mouths according to embodiments of the present invention will be described below with reference to the accompanying drawings.

Although the culvert (10) is exemplified here as a sewer main pipe, it is not limited to this, and the culvert connection structure, the culvert joint element and the culvert construction method of the present invention can be used, for example, in industrial It can also be applied to pipelines for irrigation water, pipelines for agricultural water, and the like. As the material for the culverts, concrete pipes, ceramic pipes, vinyl chloride pipes, etc. can be used, but the material is not limited to any particular material.

Polyethylene-based resins included in the present invention include polyethylene, ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ultra-high molecular weight polyethylene, EVA resin, and the like.

<Conduit joint structure of joint between conduit manhole and conduit end>
FIG. 2 is a perspective view showing a joint element in which a heating wire is embedded, which is one embodiment of the present invention.
A joint element (2) in which a heating wire (6) is embedded, which is one embodiment of the present invention, is formed on the outer periphery of the joint between the manhole (1) and the pipe (10) as shown in FIG. The thickness of the sleeve-shaped part (8) is at least equal to or greater than the thickness of the conduit, and the sleeve-shaped part has a covering part (7) on its outer circumference. ) has a pipe joint element containing polyethylene resin as a main component. The composition contained in the polyethylene-based resin is as described above.

<Manhole for culvert and pipe connection structure at the end of the culvert>
FIG. 1 is a view showing the process and structure of attaching an outer film to the cross section of the inner surface of a culvert and the inner surface of a joint element in an embodiment of the culvert construction method according to the present invention.
A manhole-to-canal connection structure for a canal, which is an embodiment of the present invention, comprising: an injection material layer (3) covering the wall surface of the manhole (1); A liner (4) covering the surface of the injection material layer (3), a joint element (2) provided at the joint and having a heating wire (6) embedded therein, On the input terminal (11) of the external power supply of the hot wire (6), the inner surface of the pipe (10) and the inner wall surface of the joint element (2), from the outside, the outer film (5) of thermoplastic resin, the intermediate layer ( 12) and an inner film (13), one side of the intermediate layer (12) is covered by the outer film (5), and the other side of the intermediate layer (12) covers the inner film (13). has a conduit joint structure including an intermediate layer (12) coated with

It is desirable to adjust the thickness of the sleeve-shaped portion (8) to 0.8 mm.

Although the content of mortar and other compositions in the mortar composition in the grouting material layer (3) is not particularly limited, the durability of the thickness of the intermediate layer (12) can be adjusted. The thickness of the intermediate layer is 50 mm as standard, but the thickness may be adjusted depending on the structure of the manhole.

The outer film (5) is made of a thermoplastic resin such as ABS resin, polyethylene, polystyrene, polypropylene, vinyl chloride resin, polyethylene terephthalate, polycarbonate, polybutylene terephthalate, polyacetal, polyimide, polyphenylene sulfide, A liquid crystal polymer or the like is used.
The thickness of the outer film (5) is desirably adjusted to 0.8 mm.
If the thickness of the outer film (5) is thin, the adhesion to the conduit (10) and the joint element (2) will be high, and the possibility of interlayer separation will be low. As the thickness increases, the strength increases, but the overall thickness after the liner is attached reduces the inner diameter of the culvert (10) after repair, lowering the flow capacity inside the pipe. For this reason, it is important to make the outer film (5) thin in order to obtain a culvert that does not cause interlayer separation, has high strength, and can secure the inner diameter of the culvert as wide as possible.

As shown in FIG. 6, the intermediate layer (12) is composed of a group consisting of glass fiber and a synthetic resin composition. For example, the glass fiber may be AR glass fiber, C glass fiber, E glass fiber, ECR glass fiber, or the like. , the synthetic resin composition is selected from unsaturated polyester resins, vinyl ester resins, and the like.

<Conduit construction method for constructing a pipe manhole and a pipe joint structure at the end of the pipe>
FIGS. 1, 3 to 5 and 7 show a pipe and culvert construction method for constructing a pipe and culvert manhole according to one embodiment of the present invention and a pipe and culvert connection structure at the end of the pipe and culvert, step by step. It is a diagram showing.

FIG. 3 shows a step of removing the sewage basin (9) provided in the culvert (10) in one embodiment of the construction method of the present invention. Remove the old sewage pit (9) installed in the culvert (10) to prevent infiltration of water.

<PML construction method>
FIG. 4 is a diagram showing a step of covering the wall surface of a manhole with an injection material layer and then covering the injection material with a liner in an embodiment of the pipe and culvert construction method according to the present invention.
After the walls of the manhole (1) are coated with the grout to form the grout layer (3), the grout layer (3) is covered with the liner (4). When forming the grout (3), a mold may be placed between the manhole (1) and the liner (4) to fix the shape of the grout layer (3). In addition, the liner may be provided with V-shaped anchors on the covering surface side of the grouting material layer (3), and the V-shaped anchors improve the load bearing performance of the grouting material layer (3). Further, by providing the V-shaped anchor, the adhesion between the grouting material layer (3) and the liner (4) is improved, and intrusion of water can be prevented.

FIG. 5 is a diagram showing a process of heating and welding the heating wire of the joint element to the liner and the joint by applying power from an external power supply in one embodiment of the pipe construction method according to the present invention.
A heating wire (6) embedded in the joint element (2) is heated and welded by applying power from an input terminal (11) of an external power supply to the joint element (2) between the liner (4) and the joint. to connect the coupling element (2) to the joint of the conduit. This construction method is called the PML construction method. As long as the input terminal (11) of the external power supply can apply power to the heating wire (6), it goes without saying that any other input terminal of the external power supply that can be used by those skilled in the art can be used. The temperature of the heating wire (6) to which power is applied to the input terminal (11) for external power is preferably around 240 degrees Celsius.

<Flash lining - S method>
FIG. 1 is a perspective view showing a multilayer structure including a thermoplastic resin outer film, an intermediate layer and an inner film in a conduit in one embodiment of the conduit construction method according to the present invention.
A thermoplastic resin outer film is attached to the inner surface and inner wall surface of the conduit (10) via the intermediate layer (12) and the inner film (13). ) is cured.

FIG. 7 shows an embodiment of the pipe and culvert construction method according to the present invention. and an intermediate layer are shown. A heating wire (6) embedded in the joint element (2) is heated to line the outer film (5) and the intermediate layer (12) provided on the inner wall surface of the joint element (2).
By this construction method, the culvert (10) and the joint element (2) are strongly welded, and it becomes possible to prevent water from entering from the pipe mouth.

Although not shown, the inner film (13) covering the inner walls of the conduit (10) and the joint element (2) is removed after the liner is cured to provide a conduit connection structure with excellent chemical resistance and abrasion resistance. can be formed.
Therefore, by integrating these steps by welding with a heating wire, it is possible to form a pipe joint structure having excellent water cut-off properties at the mouth of the pipe and culvert.

In the pipe construction method of the present invention, a joint structure (2) for the installation pipe in which the heating wire (6) is embedded in the installation pipe part in order to install the installation pipe by excavating the pipe after the flash lining-S construction method is executed. and welding the joint structure (2) and the outer film (5).

BEST MODE FOR CARRYING OUT THE INVENTION The pipe joint structure, pipe joint structure and pipe construction method of the present invention will be described below in more detail based on examples. However, the present invention is by no means limited to the following examples.

It was verified by an external pressure test that the manhole formed by the pipe and ditch construction method of the present invention has a load-bearing capacity equal to or higher than the standard value of JSWAS A-11 "Sewer Reinforced Concrete Assembled Manhole".
The standard values of JSWAS A-11 "Prefabricated reinforced concrete sewage manholes" are as follows.
(1) Axial compressive strength of 150 kN or more (2) Side bending strength of 6.9 kN/m (6.21 kN/0.9 m) for cracking and 10.4 kN/m (9.36 kN/0 for breaking) .9m) In order to confirm the above physical strength, various resistance tests were conducted using test specimens.

The test was conducted in the following test plots.
The table shown below shows a test section in which the thickness of a test body made by the PML construction method, which is an embodiment of the pipe joint structure, pipe joint structure, and pipe construction method of the present invention, was reduced by 20 mm from the conventional product, and the test It compares the physical strength with a test piece whose body thickness is reduced by 20 mm.

<Resistance test 1>

As a result of the test, the PML construction method, which is an example of the pipe and culvert construction method for forming the pipe and culvert connection structure of the present invention, has a pressure resistance and bending strength, and the manhole after construction conforms to JSWAS A-11 "Sewage Reinforced Concrete It was found to have a load-bearing capacity greater than the standard value of "Assembled Manhole".
(1) Axial compressive strength of 150 kN or more (2) Side bending strength of 6.9 kN/m (6.21 kN/0.9 m) for cracking and 10.4 kN/m (9.36 kN/0 for breaking) It was found to have excellent strength of 0.9 m) or more.

Also, in tests, it was found that the excellent adhesion between the liner and the grout layer improves the load carrying capacity and more effectively prevents water intrusion.

As a result of the test, it was found that the culvert connection structure of the present invention has durability and chemical resistance equal to or greater than that of sewage reinforced plastic composite pipe (JSWAS K-2).

INDUSTRIAL APPLICABILITY The pipe connection structure, joint element, and pipe construction method according to the present invention can be applied to a wide variety of pipes such as sewage pipes, water supply pipes, industrial water pipes, and agricultural water pipes. In addition, since the pipe construction method according to the present invention can form a pipe joint structure that prevents water from entering the pipe mouth, it is possible to prevent water from entering the pipe mouth. It is possible to provide a pipe joint structure, a joint element, and a pipe construction method that are optimal as a rehabilitation method for existing pipes.

REFERENCE SIGNS LIST 1 manhole 2 joint element 3 grout layer 4 liner 5 outer film 6 heating wire 7 coating 8 sleeve-shaped portion 9 sewage basin 10 pipe 11 external power input terminal 12 intermediate layer 13 inner film

Claims (14)

A connection structure between a manhole for a culvert and a pipe mouth at the end of the culvert, the connection structure comprising:
a grout layer covering the wall surface of the manhole;
a liner covering the surface of the injectant layer;
a joint element used in the joint structure, the joint element having a heating wire embedded therein;
an input terminal of an external power supply for the heating wire;
A multilayer structure including an outer film, an intermediate layer and an inner film of a thermoplastic resin is formed on the inner surface of the conduit and the inner wall surface of the joint element from the surface side,
one surface of the intermediate layer is covered with the outer film;
An inner film is covered by the other surface of the intermediate layer,
A pipe connection structure characterized by: The joint element includes the manhole, a sleeve-shaped portion formed on the outer periphery of the connecting portion of the pipe and culvert,
The thickness of the sleeve-shaped portion is at least equal to or greater than the thickness of the conduit,
2. The pipe connection structure according to claim 1, wherein a covering portion is provided on the outer periphery of said sleeve-shaped portion. 2. The pipe connection structure according to claim 1, wherein said intermediate layer is made of one or more selected from the group consisting of glass fiber and synthetic resin composition. The conduit connection structure according to claim 1, characterized in that said grout layer comprises at least mortar. 2. The pipe connection structure according to claim 1, wherein the liner covering the surface of the grouting material layer contains polyethylene resin as a main component. The pipe connection structure according to any one of claims 1 to 5, wherein the joint element in which the heating wire is embedded contains polyethylene resin as a main component. The coupling element comprises a sleeve-shaped portion formed around the outer circumference of the joint between the manhole and the end of the canal ;
The thickness of the sleeve-shaped portion is at least equal to or greater than the thickness of the conduit,
A covering portion is provided on the outer periphery of the sleeve-shaped portion ,
A heating wire is embedded in the pipe and the sleeve-shaped portion,
A joint element for a conduit, characterized in that the heating wire is provided with an input terminal for an external power source . 8. The pipe joint element according to claim 7, wherein the joint element in which the heating wire is embedded contains polyethylene resin as a main component. A pipe construction method for constructing a pipe joint structure of a pipe manhole and a pipe mouth at the end of the pipe, comprising:
The conduit connection structure includes:
a grout layer covering the wall surface of the manhole;
a liner covering the surface of the grout layer ;
a joint element in which the heating wire is embedded and which is a joint element provided in the pipe- and-drain joint structure;
A multilayer structure including an outer film, an intermediate layer and an inner film of a thermoplastic resin is formed on the inner surface of the conduit and the inner surface of the joint element from the surface side,
one surface of the intermediate layer is covered with the outer film;
An inner film is covered with the other surface of the intermediate layer,
The pipe construction method is
(A) removing a cesspool provided in the culvert;
(B) after step (A), covering the walls of the manhole with a grout layer;
(C) after step (B), covering the injectant layer with a liner;
(D) after the step (C), a step of heating and welding the joint element to the liner and the joint portion by applying electric power from an external power supply to the heating wire embedded in the joint element;
(E) After the step (D), lining the welded joint element and the inner wall of the pipe coupled with the joint element, and applying the intermediate layer and the inner layer to the inner surface of the pipe and the inner wall surface of the joint element. a step of attaching an outer film of a thermoplastic resin via a film;
(F) After the step (E), the inside of the pipe is lined, and then the heating wire embedded in the joint element is heated to remove the outer film and the intermediate layer provided on the inner wall surface of the joint element. a lining process;
(G) removing the inner film covering the inner walls of the conduit and the joint element after the liner is cured after the step (F). The joint element includes a sleeve-shaped portion formed on the outer periphery of the connecting portion of the manhole and the canal;
The thickness of the sleeve-shaped portion is at least equal to or greater than the thickness of the conduit, and
10. The pipe and culvert construction method according to claim 9, wherein the outer periphery of said sleeve-shaped portion is provided with a covering portion. The conduit construction method according to claim 9, wherein the intermediate layer is made of one or more selected from the group consisting of glass fibers and synthetic resin compositions. The injection material layer covering the wall surface of the manhole contains at least mortar,
The pipe construction method according to claim 9. 10. The pipe and culvert construction method according to claim 9, wherein the liner that coats the surface of the injection material layer contains polyethylene resin as a main component. The pipeline construction method according to any one of claims 9 to 13, wherein the joint element in which the heating wire is embedded contains polyethylene resin as a main component.

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