Repair materials and repair methods for existing pipe manholes

Abstract

To provide a pipe joint member, a pipe joint structure, and a pipe construction method that combine watertightness and durability to solve the problems of difficulty in preventing water infiltration into pipes due to unstable strength of joints and connecting members, and of inability to guarantee permanent watertightness in pipe joint structures. [Solution] A joint member used in the connection structure between a manhole for a sewer and the pipe opening at the end of the sewer, the joint member having a flange-shaped portion shaped to fit the wall surface of the manhole and having an electric heating wire embedded in it; a sewer connection structure comprising an injection material layer covering the wall surface of the manhole, a liner covering the surface of the injection material layer, the joint member, and an input terminal for an external power source; and a sewer construction method.

Description

[Technical Field]

[0001] The present invention relates to a joint member for an existing pipe manhole, a pipe connection structure for the end of a pipe, and a pipe construction method. [Background technology]

[0002] As of the end of fiscal year 2020, the total length of sewerage pipes nationwide was approximately 490,000 km, of which approximately 25,000 km (5% of the total length) had exceeded the standard service life of 50 years. These existing sewer pipes have deteriorated significantly over the years due to subsidence and increased traffic loads, and there have been many incidents of water leakage, road collapses, and odor problems that are thought to be caused by damage to the sewer pipes. It is known that the number of deteriorated pipes that have exceeded their standard service life and require rehabilitation will rapidly increase in the future, reaching 82,000 km (17% of the total length) in 10 years and 190,000 km (39% of the total length) in 20 years. In order to ensure sustainable sewerage functions, planned maintenance and renovation will be necessary.

[0003] Similarly, in stormwater pumping stations, which must operate reliably during rainfall, the same trend is observed, with approximately 1,300 (81% of the total) of the approximately 1,600 stormwater pumping stations nationwide as of the end of fiscal year 2020 having exceeded the standard service life of 20 years for their equipment.

[0004] Furthermore, there have been many cases where the amount of wastewater, including water infiltration during rainy weather, exceeds the treatment capacity of sewerage facilities due to factors such as rising groundwater levels caused by typhoons and sudden heavy rains. For many years, water infiltration during rainy weather has been treated as a temporary phenomenon associated with rainfall, and has not been sufficiently taken into consideration in facility planning.

[0005] However, in recent years, the increase in water volume has become a problem, and factors that cause water to seep in during rainy weather include increased rainfall due to climate change, aging sewage pipe facilities, and incorrect connections of drainage equipment.The increase in the amount of water seeping in during rainy weather has caused problems such as overflow from sewage pipes, backflow into homes, and impacts on public water areas due to reduced functionality of treatment facilities, making it necessary to take measures to prevent water seepage.

[0006] Patent Document 1 discloses a method for connecting a manhole and a sewer, and a method for rehabilitating an aged sewer. The method describes a method for crimping a connecting member using a thermosetting or photocurable liner. Patent Document 1 describes crimping a liner to a connecting member during construction of an existing pipe, but does not recognize the problem that differences in crimping between the joint and the connecting member may occur depending on the thickness of the liner and the crimping method. The construction method described in Patent Document 1 had the problem that if the thickness of the lining material was reduced, a liner with sufficient strength could not be obtained, and the strength of the joints and connecting members was reduced, making it difficult to prevent water infiltration.

[0007] Patent Document 2 discloses a pipe connection structure for a pipe, a pipe joint element, and a pipe construction method. It describes a process of heat-welding the joint element and a liner covering a manhole with an electric heating wire, and a process of lining the joint element and the pipe with an outer film and then heat-welding the joint element and the outer film with an electric heating wire. Patent Document 2 does not describe shaping the pipe joint element to fit the wall surface of the manhole. The pipe joint element described in Patent Document 2 had the problem that, depending on the shape of the manhole inner wall, it was not possible to fully ensure the integrity of the manhole liner after heat welding, and it was not possible to maintain permanent watertightness. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Special Publication No. 2022-509049 [Patent Document 2] Japanese Patent Application Publication No. 2023-175379 Summary of the Invention [Problem to be solved by the invention]

[0009] Conventional connecting members have the technical issue that there may be differences in the crimping of the connecting members at the joint between the sewer and the manhole, and that if the thickness of the lining material is reduced, the strength of the joint and connecting members becomes unstable, making it difficult to prevent water from seeping into the sewer. Furthermore, conventional pipe joint elements have the problem that they cannot guarantee permanent watertightness in pipe connection structures that use them. The present invention has been made to solve these problems, and aims to provide a pipe and drain joint member that achieves both high water-tightness and durability, a pipe and drain connection structure using said member, and a pipe and drain construction method. [Means for solving the problem]

[0010] The invention of claim 1 is a joint member used in a connection structure between a manhole for a culvert and a pipe opening at the end of the culvert, the joint member comprising a sleeve-shaped portion formed to fit the inner diameter of the culvert, and a flange-shaped portion provided on the outer periphery of the sleeve-shaped portion, the flange-shaped portion having a shape that fits the wall surface of the manhole, The flange-shaped portion is a hollow, disk-shaped member having a curved surface on the side that comes into contact with the wall surface of the manhole, and the coupling member has no central portion, and is shaped like a plano-convex lens including an imaginary portion when viewed in cross section, and the imaginary apex of the curve of the coupling member when viewed in cross section is on the opposite side of the sleeve-shaped portion, and the curve forms an arc toward the sleeve-shaped portion, The present invention relates to a joint member characterized in that an electric heating wire is embedded in the sleeve-shaped portion and the flange-shaped portion, and the electric heating wire is provided with an input terminal for an external power source.

[0011] A second aspect of the present invention relates to the joint member according to the first aspect, characterized in that the joint member contains a polyethylene resin as a main component.

[0012] The invention according to claim 3 is a connection structure between a manhole for a sewage pipe and a pipe opening at the end of the sewage pipe, in which the joint member according to claim 1 or 2 is used, the connection structure comprising an injection material layer covering the wall surface of the manhole, a liner covering the surface of the injection material layer, the joint member provided for use in the connection structure, and a multilayer structure including an outer film, an intermediate layer and an inner film made of a thermoplastic resin, from the surface side, on the inner surface of the sewage pipe and the inner wall surface of the joint member, The present invention relates to a bonding structure characterized in that one surface of the intermediate layer is covered by the outer film, and the other surface of the intermediate layer covers an inner film.

[0013] The invention according to claim 4 relates to the pipe and conduit connection structure according to claim 3, wherein the intermediate layer is made of one or more materials selected from the group consisting of glass fiber and synthetic resin compositions.

[0014] The invention according to claim 5 relates to the bonded structure according to claim 3, characterized in that the injection material layer contains at least mortar.

[0015] The invention according to claim 6 relates to the connection structure according to claim 3, characterized in that the liner contains a polyethylene resin as a main component.

[0016] The invention according to claim 7 is a sewer construction method for constructing the connection structure according to claim 3, wherein the connection structure comprises an injection material layer covering the wall surface of the manhole, a liner covering the surface of the injection material layer, the joint member provided in the connection structure, and a multilayer structure including, from the surface side, an outer film of a thermoplastic resin, an intermediate layer, and an inner film on the inner surface of the sewer and the inner surface of the joint member, one side of the intermediate layer is covered by the outer film, and the inner film is covered by the other side of the intermediate layer, and the sewer construction method comprises: (A) a step of covering the wall surface of the manhole with an injection material layer; (B) after the step (A), a step of covering the injection material layer with a liner; (C) after step (B), a step of heating and welding the coupling member to the liner and the connecting portion by applying electric power from an external power source to an electric heating wire embedded in the coupling member; (D) after step (C), a step of lining the welded coupling member and the inner wall of the culvert connected to the coupling member, and applying an outer film made of a thermoplastic resin to the inner surface of the culvert and the inner wall surface of the coupling member with the intermediate layer and inner film interposed therebetween; and (E) after step (D), a step of lining the inside of the culvert, and then heating the electric heating wire embedded in the coupling member to line the outer film and intermediate layer provided on the inner wall surface of the coupling member.

[0017] An eighth aspect of the present invention relates to the pipe and conduit construction method according to the seventh aspect, wherein the intermediate layer is made of one or more materials selected from the group consisting of glass fibers and synthetic resin compositions.

[0018] The invention according to claim 9 relates to the sewer construction method according to claim 7, characterized in that the injection material layer covering the wall surface of the manhole contains at least mortar.

[0019] The invention according to claim 10 relates to the sewer and conduit construction method according to claim 7, characterized in that the liner contains a polyethylene resin as a main component. [Effects of the Invention]

[0020] According to the joint member of claim 1, the joint member is used in a connection structure between a manhole for a culvert and a pipe opening at the end of the culvert, and is provided with a sleeve-shaped portion formed to fit the inner diameter of the culvert, and a flange-shaped portion provided on the outer periphery of the sleeve-shaped portion, and the flange-shaped portion has a shape that fits the wall surface of the manhole, The flange-shaped portion is a hollow, disk-shaped member having a curved surface on the side that comes into contact with the wall surface of the manhole, and the coupling member has no central portion, and is formed in the shape of a plano-convex lens including an imaginary portion when viewed in cross section, and the imaginary apex of the curve of the coupling member when viewed in cross section is on the opposite side of the sleeve-shaped portion, and the curve forms an arc toward the sleeve-shaped portion, It is characterized by the fact that it covers not only the pipe opening but also the area around the opening, and can be integrated with the manhole by heating and welding it using an electric heating wire. Therefore, the joint member according to claim 1 has the effect of forming a pipe joint that can prevent water intrusion over a wide area, ensure high water-tightness, and be easily attached to the pipe opening of the pipe.

[0021] According to the joint member of claim 2, the joint member is characterized by containing a polyethylene-based resin as a main component, and therefore has the effect of being able to form a pipe and conduit connection structure that is excellent in chemical resistance and abrasion resistance.

[0022] According to the sewer connection structure of claim 3, the connection structure is a connection structure between a manhole for a sewer and a pipe opening at the end of the sewer, in which the joint member of claim 1 or 2 is used, and is characterized in that the connection structure comprises an injection material layer that covers the wall surface of the manhole, a liner that covers the surface of the injection material layer, a joint member provided for use in the connection structure, and a multilayer structure including, from the surface side, an outer film, an intermediate layer, and an inner film made of thermoplastic resin on the inner surface of the sewer and the inner wall surface of the joint member, one side of the intermediate layer is covered by the outer film, and the inner film is covered by the other side of the intermediate layer. The pipe connection structure, which is a feature of the present invention, heat-welds the outer outer film and the liner covering the surface of the injection material layer together using a joint member with an embedded heating wire, thereby reliably preventing water from seeping in from the pipe opening and eliminating the risk of water leakage. Therefore, the connection structure according to claim 3 has the advantageous effect of forming a culvert connection structure that has excellent water-stopping properties at the culvert mouth.

[0023] According to the pipe connection structure of claim 4, the intermediate layer is made of one or more materials selected from the group consisting of glass fiber and synthetic resin compositions, and therefore has superior performance and can maintain high water resistance for a long period of time, thereby achieving the advantageous effect of forming an intermediate layer with high water-stopping properties and durability on the inner surface of the pipe.

[0024] According to the pipe and conduit joint structure of claim 5, the injection material layer contains at least mortar, which allows the injection material to maintain excellent load-bearing and pressure-resistant performance, thereby achieving the effect of forming a pipe and conduit joint structure with excellent load-bearing capacity.

[0025] According to the pipe and conduit connection structure of claim 6, the liner covering the surface of the injection material layer is characterized by containing a polyethylene resin as its main component, which has the advantageous effect of forming a pipe and conduit connection structure that is approximately 30 times more abrasion resistant and chemical resistant than the highly versatile polyvinyl chloride resin.

[0026] According to the pipe and conduit connection structure of claim 6, the lining material is characterized by containing a polyethylene resin as a main component, and therefore can maintain excellent elongation performance and high water resistance for a long period of time. Therefore, the lining material has the effect of forming a culvert connection structure at the culvert mouth that has excellent water-stopping properties and durability.

[0027] According to the sewer construction method of claim 7, the sewer construction method includes: (A) a step of covering the wall surface of the manhole with an injection material layer; (B) after the step (A), a step of covering the injection material layer with a liner; (C) after the step (B), a step of heating and welding the joint member to the liner and the joint portion by applying electric power from an external power source to an electric heating wire embedded in the joint member; and (D) after the step (C), a step of lining the welded joint member and the inner wall of the sewer connected to the joint member. and (E) after step (D), lining the inside of the pipe of the culvert, then heating the heating wire embedded in the coupling member, and lining the outer film and intermediate layer provided on the inner wall surface of the coupling member. This makes it possible to form a culvert connection structure with excellent chemical resistance and abrasion resistance. Therefore, these steps have the effect of forming a culvert connection structure that has excellent water-stopping properties at the culvert mouth.

[0028] According to the pipe and conduit construction method of claim 8, the intermediate layer is made of one or more materials selected from the group consisting of glass fiber and synthetic resin compositions, which has the effect of maintaining better performance and high water resistance for a long period of time. Therefore, the sewer construction method of the present invention can form an intermediate layer on the inner peripheral surface of the sewer that has high water-stopping properties and durability.

[0029] According to the pipe and conduit construction method of claim 9, the injection material layer contains at least mortar, which has the advantageous effect of maintaining excellent load-bearing performance and pressure-bearing performance.

[0030] According to the sewer construction method of claim 10, the liner covering the surface of the injection material layer is characterized by containing polyethylene resin as its main component, thereby achieving the advantageous effect of forming a sewer connection structure with excellent chemical resistance and abrasion resistance. [Brief explanation of the drawings]

[0031] [Figure 1a] FIG. [Figure 1b] This is a plan view of the coupling member as seen from the side that contacts the wall surface of the manhole. [Figure 1c] FIG. [Figure 2] 1 is a diagram showing a process of attaching an outer film to the inner surface of a pipe and a cross-sectional portion of the inner surface of a joint member in one embodiment of a pipe construction method according to the present invention, and the structure thereof. For convenience of drawing to facilitate understanding, the shape of the joint member is illustrated in a simplified form in FIG. 2 and subsequent figures. [Figure 3a] FIG. 10 is a diagram showing a state before the sewage manhole is removed in the process of removing the sewage manhole from the sewage manhole in one embodiment of the sewage manhole construction method according to the present invention. [Figure 3b] FIG. 10 is a diagram showing the state after the sewage manhole has been removed in the process of removing the sewage manhole from the sewage manhole in one embodiment of the sewage manhole construction method according to the present invention. [Figure 4] FIG. 10 is a diagram showing a process of covering the wall surface of a manhole with a grouting material layer and then covering the grouting material layer with a liner in one embodiment of the sewer construction method according to the present invention. [Figure 5] FIG. 10 is a diagram showing a process for heating and welding the liner and the joint by applying electric power from an external power source to the heating wire of the joint member in one embodiment of the pipe and conduit construction method according to the present invention. [Figure 6] 1 is a perspective view showing a multilayer structure of a pipe including an outer film, an intermediate layer, and an inner film made of a thermoplastic resin in one embodiment of a pipe construction method according to the present invention. FIG. [Figure 7] FIG. 10 is a diagram showing a process of lining the inside of a pipe, then heating an electric heating wire embedded in the joint member, and welding an outer film and an intermediate layer provided on the inner wall surface of the joint member, in one embodiment of a pipe construction method according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] Hereinafter, a joint member, a pipe connection structure, and a pipe construction method for preventing water from entering a pipe opening according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0033] Here, the pipe 10 is exemplified as a main sewer pipe, but is not limited to this, and the pipe joint member, pipe connection structure, and pipe construction method of the present invention can also be applied to, for example, industrial water pipes, agricultural water pipes, etc. Furthermore, the pipe material can be concrete pipes, ceramic pipes, polyvinyl chloride pipes, etc., but is not limited to a specific material.

[0034] The polyethylene resins included in the present invention include polyethylene, very low density polyethylene, low density polyethylene, linear low density polyethylene, high density polyethylene, ultra-high molecular weight polyethylene, EVA resin, and the like.

[0035] The polyethylene resins may be used alone or in combination.

[0036] <Pipe joint member for connecting the manhole for pipes and the end of the pipe> FIG. 1a is a perspective view showing a joint member in which a heating wire is embedded, which is one embodiment of the present invention. As shown in Fig. 1a, a joint member (2) having an electric heating wire (6) embedded therein is provided with a sleeve-shaped portion (8) formed to fit the inner diameter of the pipe, and a flange-shaped portion (7) on the outer periphery of the sleeve-shaped portion (8). The flange-shaped portion (7) has a curved surface that fits the wall surface of the manhole, and this joint member (2) is a joint member for pipes containing a polyethylene-based resin as a main component. The composition contained in the polyethylene-based resin is as described above.

[0037] In another embodiment of the invention, the collar has a flat shape.

[0038] In this specification, the term "main component" refers to a component that accounts for 50% by mass or more of the total mass.

[0039] The content of the polyethylene resin in the joint member 2 is preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, and particularly preferably 90% by mass or more, based on the total mass. The content of the polyethylene resin in the joint member 2 can also be 100% by mass.

[0040] The inner diameter of the conduit is, for example, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 550 mm, or 600 mm, but is not limited to these.

[0041] The thickness of the sleeve-shaped portion (8) is preferably 10 mm to 30 mm, but is not limited to this. If it is less than 10 mm, there is a risk of perforations occurring in the sleeve-shaped portion due to melting when heat welding is performed using an electric heating wire. If it is more than 30 mm, the weight increases and an extra step may be required to support the joint member (2) during installation.

[0042] The thickness of the flange-shaped portion (7) is preferably 10 mm to 30 mm, but is not limited to this. If it is less than 10 mm, there is a risk of perforations occurring in the flange-shaped portion due to melting when heat welding is performed using an electric heating wire. If it exceeds 30 mm, the weight increases and an extra step may be required to support the joint member (2) during installation.

[0043] FIG. 1b is a plan view of a joint member in which an electric heating wire is embedded, as viewed from the side that contacts the wall surface of a manhole, according to one embodiment of the present invention. The coupling member (2) according to one embodiment of the present invention has a curved surface that fits the curved wall surface of the manhole.

[0044] FIG. 1c is a cross-sectional view of a coupling member according to an embodiment of the present invention, seen from above a manhole when used in a pipe opening connection structure.

[0045] As shown in Figure 1c, the coupling member (2) according to one embodiment of the present invention is a hollow, disk-shaped member having a curved surface on the side that contacts the wall of the manhole. The coupling member (2) does not have a central portion, but in cross-sectional view, it is shaped like a plano-convex lens, including an imaginary portion. In cross-sectional view, the imaginary apex of the curve of the coupling member (2) is on the opposite side of the sleeve-shaped portion (8), and the curve forms an arc toward the sleeve-shaped portion (8).

[0046] In another embodiment of the invention, the coupling member has a flat shape that fits onto the wall of a flat manhole.

[0047] The manholes that use the coupling member (2) are, for example, but not limited to, No. 1 manhole, No. 2 manhole, and No. 3 manhole. The coupling member may also be used in special manholes with flat inner walls.

[0048] In one embodiment of the present invention, the inner diameter of the manhole to which the curved surface of the coupling member (2) can be adapted is, for example, Φ900 mm, Φ1800 mm, Φ3600 mm, but is not limited to these.

[0049] A barcode for information management may be attached to the coupling member 2 according to one embodiment of the present invention, and the barcode may include information such as the voltage and current application time required for heat welding for each coupling member.

[0050] The term "barcode" as used herein includes one-dimensional codes and two-dimensional codes.

[0051] <Pipe connection structure between manhole for pipe and pipe end> FIG. 2 is a diagram showing the process and structure of applying an outer film to the inner surface of a pipe and the cross-sectional portion of the inner surface of a joint member in one embodiment of the pipe construction method according to the present invention. A pipe connection structure between a manhole for a pipe and a pipe that is an embodiment of the present invention, the pipe connection structure includes an injection material layer (3) that covers the wall surface of the manhole (1), a liner (4) that covers the surface of the injection material layer (3), a coupling member (2) provided at the connection portion, the coupling member (2) in which an electric heating wire (6) is embedded, an input terminal (11) for an external power source for the electric heating wire (6), and a multilayer structure including, from the outside, an outer film (5), an intermediate layer (12) and an inner film (13) made of thermoplastic resin on the inner surface of the pipe (10) and the inner wall surface of the coupling member (2), 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), thus forming the pipe connection structure.

[0052] The content of the mortar and other components in the mortar composition in the injection layer (3) is not particularly limited, but it is possible to adjust the durability of the thickness of the intermediate layer (12). The standard thickness of the intermediate layer is 50 mm, but the thickness may be adjusted each time depending on the structure of the manhole.

[0053] 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, liquid crystal polymer, etc. The thickness of the outer film (5) is preferably adjusted to 0.8 mm. A thinner outer film (5) provides better adhesion to the sewer (10) and the coupling element (2), reducing the likelihood of delamination. A thicker outer film (5) provides greater strength, but the overall thickness increases after the liner is applied, reducing the inner diameter of the repaired sewer (10) and reducing the flow capacity within the pipe. Therefore, it is important to use a thinner outer film (5) in order to prevent delamination, ensure high strength, and ensure a sewer with as wide an inner diameter as possible.

[0054] As shown in FIG. 6, the intermediate layer (12) consists of a group of glass fiber and synthetic resin composition. For example, the glass fiber may be AR glass fiber, C glass fiber, E glass fiber, ECR glass fiber, etc., and the synthetic resin composition is selected from unsaturated polyester resin, vinyl ester resin, etc.

[0055] <Manhole for pipe channels and pipe channel construction method for constructing a pipe channel connection structure at the end of a pipe channel> FIGS. 3 to 5 and FIG. 7 are diagrams showing step by step a manhole for pipe channels according to an embodiment of the present invention and a pipe channel construction method for constructing a pipe channel connection structure at the end of a pipe channel.

[0056] FIG. 3 shows a step of removing the sewage sump (9) provided in the pipe channel (10) in an embodiment of the construction method of the present invention. The aged sewage sump (9) provided in the pipe channel (10) is removed to prevent intrusion of water.

[0057] <PML construction method> FIG. 4 is a diagram showing a step of covering the wall surface of the manhole with an injection material layer and then covering the injection material with a liner in an embodiment of the pipe channel construction method according to the present invention. After covering the wall surface of the manhole (1) with an injection material to form an injection material layer (3), the injection material layer (3) is covered with a liner (4). When forming the injection material (3), a formwork may be installed between the manhole (1) and the liner (4) to fix the shape of the injection material layer (3). Further, the liner may be provided with a V-shaped anchor on the covering surface side of the injection material layer (3), and the V-shaped anchor improves the load-bearing performance of the injection material layer (3). Also, by providing the V-shaped anchor, the adhesion between the injection material layer (3) and the liner (4) is improved, and intrusion of water can be prevented.

[0058] FIG. 5 is a diagram showing a step of heating and welding by applying electric power from an external power source to the electric heating wire of the joint member at the liner and the joint part in an embodiment of the pipe channel construction method according to the present invention. The coupling member (2) is connected to the liner (4) at the joint by applying power from an external power input terminal (11) to the heating wire (6) embedded in the coupling member (2) to heat and weld it, thereby connecting the coupling member (2) to the joint of the pipe. This construction method is called the PML construction method. The external power input terminal (11) can be any external power input terminal that a person skilled in the art can use, as long as it can apply power to the heating wire (6). It is also desirable that the temperature of the heating wire (6) when power is applied to the external power input terminal (11) is around 240 degrees Celsius. The PML method may include a step of temporarily fastening the joint member 2 to the liner 4 and the joint before heat welding. Any method known to those skilled in the art can be used for the temporary fastening. The coupling member (2) is provided with a flange-shaped portion (7) having a shape that fits the wall surface of the manhole (1), which makes it easy to attach the coupling member (2) to the liner (4) and the joint, and also ensures high water-stopping power and durability after heat welding.

[0059] <Pipe connection structure between manhole for pipe and pipe end> 7 is a diagram showing a process of lining the inside of a pipe and then heating an electric heating wire embedded in the joint member (2) to weld the outer film and intermediate layer provided on the inner wall surface of the joint member (2) in one embodiment of the pipe construction method according to the present invention. The electric heating wire (6) embedded in the joint member (2) is heated to line the outer film (5) and intermediate layer (12) provided on the inner wall surface of the joint member (2). This construction method makes it possible to firmly weld the pipe (10) and the joint member (2) together, preventing water from seeping in through the pipe opening. The flash lining-S method is suitable for lining the inside of pipes.

[0060] <Flash Lining-S Method> An outer film made of thermoplastic resin is applied to the inner surface and wall of the pipe via an intermediate layer and inner film, then the inside of the pipe is lined and the intermediate layer is hardened. This construction method is called the Flash Lining-S method.

[0061] Although not shown in the figure, by removing the inner film (13) covering the inner walls of the pipe (10) and the joint member (2) after the liner has hardened, a pipe joint structure with excellent chemical resistance and abrasion resistance can be formed. Therefore, by integrating these processes by welding with an electric heating wire, it is possible to form a pipe joint structure that has excellent water-stopping properties at the pipe opening of the pipe.

[0062] The pipe construction method of the present invention may include, after the Flash Lining-S construction, a step of providing a joint member (2) for the attachment pipe having an electric heating wire (6) embedded in the attachment pipe portion in order to install the attachment pipe by excavating the pipe, and a step of welding the joint member (2) and an outer film (5). [Example]

[0063] The following examples of the pipe joint member, pipe connection structure, and pipe construction method of the present invention will be given to clarify the effects of the present invention, but the present invention is not limited to the following examples.

[0064] External pressure tests have demonstrated that the manholes formed by the pipe construction method of the present invention have a load-bearing capacity that exceeds the standard value of JSWAS A-11 ``Sewerage Reinforced Concrete Assembled Manholes.'' The standard values ​​for JSWAS A-11 "Sewerage reinforced concrete assembled manhole" are as follows: (1) Axial pressure resistance of 150 kN or more (2) Lateral bending strength: crack 6.9 kN / m (6.21 kN / 0.9 m) or more, fracture 10.4 kN / m (9.36 kN / 0.9 m) or more In order to confirm the physical strength of these materials, various durability tests were carried out using test specimens.

[0065] The test was carried out in the following test areas: Table 1 below compares the physical strength of test specimens made using the pipe joint members, pipe connection structures, and PML method, which is an example of a pipe construction method of the present invention, with a test specimen in which the thickness was reduced by 20 mm compared to conventional products, and a test specimen in which the thickness was reduced by 20 mm.

[0066] [Table 1]

[0067] As a result of the test, it was found that the PML method, which is one example of a pipe construction method for forming a pipe connection structure of the present invention, has a load-bearing capacity in terms of pressure resistance and bending strength of the manhole after construction that exceeds the standard values ​​of JSWAS A-11 ``Sewerage Reinforced Concrete Assembled Manhole.'' (1) Axial pressure resistance of 150 kN or more (2) The lateral bending strength was found to be excellent, with cracking strength of 6.9 kN / m (6.21 kN / 0.9 m) and fracture strength of over 10.4 kN / m (9.36 kN / 0.9 m).

[0068] The tests also revealed that the excellent adhesion between the liner and the injection layer improved load-bearing capacity and more effectively prevented water intrusion.

[0069] As a result of the test, it was found that the pipe and culvert joint structure of the present invention has durability and chemical resistance equal to or greater than that of reinforced plastic composite pipe for sewerage (JSWAS K-2).

[0070] In order to confirm the bonding strength and adhesion between the lining material and the joint part of the joint member, an impact resistance test and a watertightness test were conducted using a lining material and joint member whose main component is a polyethylene-based resin, which is an example of the present invention.

[0071] <Impact resistance test> The lining material joint of the joint member was struck with a hammer, and no peeling due to the impact was observed.

[0072] <Watertightness test> Water was poured into the space inside the welded surface between the lining material joint part of the joint component and the lining material, filling the space up to the inside of the welded surface with water, and water pressures of 0.05 MPa and 0.10 MPa were applied for 3 minutes each. After that, the state of welding at the outer edge of the lining material joint part of the joint component was checked. An internal water pressure of 0.05 MPa was applied, but no peeling or leakage of the welded surface was observed. An internal water pressure of 0.10 MPa was applied, but no peeling or leakage of the welded surface was observed. Finally, the joint between the coupling member and the lining material was opened and inspected, and no peeling, damage, or leakage was found in the welded area. The above resistance tests confirmed that the joint member and lining material have high bonding strength and watertightness.

[0073] The joint members, pipe connection structures, and pipe construction methods of the present invention are applicable to a wide variety of pipes, from sewerage pipes to water supply pipes, industrial water pipelines, and agricultural water pipelines. Furthermore, the pipe construction method of the present invention can form a pipe connection structure that prevents water from seeping into the pipe opening of the pipe, so it is possible to provide joint members, pipe connection structures, and pipe construction methods that are optimal as pipes or as a method for rehabilitating existing pipes to prevent water from seeping into the pipe opening. [Explanation of symbols]

[0074] 1 manhole 2 Joint members 3 Injection material layer 4 Liner 5 Outer film 6 heating wire 7. Flange-shaped part 8 Sleeve-shaped part 9 Sewage Manhole 10 Pipe culvert 11 External power supply input terminal 12 Middle Class 13 Inner film

Claims

1. A joint member used in the connection structure between a manhole for a sewer and a pipe opening at the end of the sewer, a sleeve-shaped portion formed to fit the inner diameter of the culvert; a flange-shaped portion provided on an outer periphery of the sleeve-shaped portion, The flange-shaped portion has a shape that fits to the wall surface of the manhole, The flange-shaped portion is a hollow, disk-shaped member having a curved surface on the side that comes into contact with the wall surface of the manhole, and the coupling member has no central portion, and is shaped like a plano-convex lens including an imaginary portion when viewed in cross section, and the imaginary apex of the curve of the coupling member when viewed in cross section is on the opposite side of the sleeve-shaped portion, and the curve forms an arc toward the sleeve-shaped portion, a heating wire is embedded in the sleeve-shaped portion and the flange-shaped portion; The heating wire is provided with an input terminal for an external power source. A coupling member characterized by:

2. The joint member according to claim 1, characterized in that the joint member contains a polyethylene resin as a main component.

3. A connection structure between a manhole for a sewer and a pipe opening at an end of the sewer, in which the coupling member according to claim 1 or 2 is used, the connection structure comprising: an injection layer covering the wall surface of the manhole; a liner covering the surface of the injection material layer; The coupling member provided for use in the connection structure; a multilayer structure including, from the surface side, an outer film, an intermediate layer, and an inner film made of a thermoplastic resin is formed on the inner surface of the conduit and the inner wall surface of the joint member; one surface of the intermediate layer is covered with the outer film; The inner film is covered with the other surface of the intermediate layer. A bonding structure characterized by:

4. 4. The pipe and conduit joint structure according to claim 3, wherein the intermediate layer is made of at least one material selected from the group consisting of glass fiber and synthetic resin compositions.

5. The bonded structure according to claim 3, wherein the injection layer includes at least mortar.

6. The joining structure according to claim 3 , wherein the liner contains a polyethylene resin as a main component.

7. A pipe and drain construction method for constructing the connection structure according to claim 3, The bonding structure is an injection layer covering the wall surface of the manhole; a liner covering the surface of the injection material layer; The joint member provided in the connection structure; a multilayer structure including, from the surface side, an outer film, an intermediate layer, and an inner film made of a thermoplastic resin is formed on the inner surface of the tubular culvert and the inner surface of the joint member; 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; The pipe and drainage method is (A) coating the wall of the manhole with a layer of injection material; (B) after step (A), covering the injection material layer with a liner; (C) after the step (B), a step of heating and welding the joint member to the liner and the joint portion by applying electric power from an external power source to a heating wire embedded in the joint member; (D) after the step (C), lining the welded joint members and the inner wall of the pipe connected to the joint members, and attaching an outer film made of a thermoplastic resin to the inner surface of the pipe and the inner wall surface of the joint member via the intermediate layer and the inner film; (E) After the step (D), a step of lining the inside of the pipe of the culvert, then heating an electric heating wire embedded in the joint member, and lining an outer film and an intermediate layer provided on the inner wall surface of the joint member.

8. 8. The pipe and conduit construction method according to claim 7, wherein the intermediate layer is made of at least one material selected from the group consisting of glass fibers and synthetic resin compositions.

9. The injection material layer covering the wall surface of the manhole contains at least mortar. The pipe and conduit construction method according to claim 7.

10. 8. The pipe and conduit construction method according to claim 7, wherein the liner contains a polyethylene resin as a main component.

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